Purify your Biogas with Biogas Scrubbers: Why & How // Full explaination // Biogas Digester
ฝัง
- เผยแพร่เมื่อ 28 พ.ค. 2024
- The simple way to purify your biogas. The gas from a biogas digester contains more than just methane. Without purification, it can contain carbon dioxide, water vapour and the dangerous hydrogen sulfide.
Carbon Dioxide - removed with water:
Carbon dioxide is not dangerous but it will mean that the gas will not burn cleanly. So if the flame of your biogas is orange it suggests your gas is a high proportion of carbon dioxide.
Water Vapour - removed with cat litter (or activated charcoal or any desiccant )
Water vapour can get into your biogas due to the temperature of the digester. Any moisture in the biogas can be corrosive to any metal pipes you use and also gas bottles if you compress into to store. There is a simple way to remove this, so don't risk those issues by checking out how.
Hydrogen sulfide - removed with steel wool:
Hydrogen sulfide is a really dangerous gas. It will attack the mucous membrane in your airways and around your eyes. In biogas, it is never in high quantities but it can still cause harm, so it is safer to remove it. Again, it is not worth the risks of not purifying the biogas because it is so easy and simple.
In the video, I explain a bit more about that and the low-tech ways to remove those gases you don't want.
Chapters:
0:00 Introduction
0:21 Why do we need to use Scrubbers?
1:36 How do we remove unwanted gases?
3:24 Fitting scrubbers to the digester
5:37 Summary of using biogas scrubbers
5:54 Outro
I hope you found this useful. Let me know if you did, if you didn't where would you like more detail? Cheers
Construct a large solar heater using an insulated structure mounted to the roof and painted black. Fill the interior with brass tubing painted black, and line the interior of the insulating structure with mirrors. Add one mirror above the structure as a back/lid that stands up vertically at the back of the structure. Careful to monitor the suns rays each season and make sure it's not aiming any reflected light at dry flammable materials. Route the pipes through your system and connect them to the in and out on the solar oven.
Great idea! I will hopefully get round to doing something with a solar heater at some point.
Thank u so much .
No problem!
Hey... I need a one on one. I am a biosystems engineering student. I would like to know more about cleaning the biogas and compressing it to cylinders. Is there anyway we could get in contact
Very helpful video and I very much appreciate your detailed explanation. We own a farm and we have lots of animals and lots of leftover vegetable products and a bio digester set up with the filtration system like what you explained here is exactly what’s needed. Ultimately we would like to do the same thing is maybe filter the Biogas a second time through the three step process so that it can be compressed into cylinders and used to power a Biogas generator. That is really what we would like to do and would like to get to this point because we’re trying to build a offgrade community that will use Biogas for the generator and solar panels with a battery back up system where we can implement this kind of generator when the battery level drops below 50%. I am very interested in learning more on a larger scale but we want to make sure we do it correctly and would love to communicate sometime for a sharper outcome that can be used for off grid living. As far as the toilets we will be using incinerator toilets and the gray water will be put through a gray water filtration system before going into the Drain system. We have given this much thought I just thought I’d share a little bit with you as well. Thank you so much will always be watching
Thanks Patrick. Sounds like you have a really given it some thought. Your system sound like the perfect system! Keep me updated when you get it running. Always interesting to hear about others experiences with biogas and off-grid tech
Yeah same here on all points what I have to worry about now is he saying it's not efficient to run in the winter I will make that comment to him as well
Very helpful. Consider a wood chip compost pile next to the biodigester to keep it warm. I'm planning this inside a small "greenhouse" to heat the digester.
And make sure the greenhouse is vented at the top
Hi Tom , nice video. It is great to see the channel growing.
Hi Craig. Thanks very much! I really appreciate you coming back and watching new videos. Cheers
Very informative and helpful video. Thanks for your efforts and time.
Glad it was helpful!
This is what I am looking for. Thank you for a good explanation & in sharing your project..
Great! Glad it helped
Great video and info! thanks
Glad it was helpful!
Awesome videos, can't wait for the gas compression and generator videos.
You and me both!
good info! looking forward to the compressed gas video.
You and me both!
@@GetMeOffGrid_this looks cool th-cam.com/video/mLblB04UfUo/w-d-xo.html
Thank you so very much for the video ❤
Thank you so much for that information. It is very useful for me
Glad it was helpful!
Awesome 👍
Thanks
Simple and easy to do, best video on the topic😃🤩🌱🌏
Thanks so much 😊
Thank you bro fro your valuable information.
No worries. Glad you found it valuable
Suprb👍👍
Thanks 👍
Thanks for sharing this video. Mabuhay from the Philippines.
Thanks!
Thanks for u r information
No worries. I am glad you found it useful
Thanks a lot good information
Glad it was helpful!
You are best teacher.
Thank u so much.
Thank u youtube.
I learn a lot on youtube.
I am glad you find my videos useful! Cheers
Thanks such an information,
I am happy it was useful to you
Thanks for this. Really clever using cat litter. Hadn‘t thought of that. For heating, would maybe encasing your digester in compost be a reasonable heat source for avoiding decommissioning in winter?It would require a high heat compost with enough nitrogen and cellulose, but seems like a good off-grid thing worth experimenting with.
Awesome video. Do you think this system would work with wood gasifier generator?
Nice video. at wich rate should we change for example the water of the scrubbers?
Nice vid
Thanks!
You can increase the efficiency of the CO2 removal stage by using aquarium air stones. They make the bubbles really small thus increasing the surface area of the gas/water interface. Not sure if you have enough pressure though.
Secondly, a glass enclosure (greenhouse) around the biogas digester would warm it up quite a bit, especially if you paint the digester housing black. Use the Sun.
Hi Thomas, Thanks for the suggestions. Check out my most recent video on scrubbers...I did extactly as you suggest...great minds! th-cam.com/video/4HXgKTqT-l8/w-d-xo.html
I didn't go for a greenhouse, I went for the other option which was a lot of insulation: th-cam.com/video/TJUqjQbnon4/w-d-xo.html
@@GetMeOffGrid_Too funny! I will check it out.
thank you for detailed explanation.......If you may, why didn't you close the opening of the feed to prevent oxygen from entering??
This video was very helpful, i have a defence at school today cos I'm currently working on a project on biodigester
Glad it helped!
Good afternoon
Please what else can i use in place of silica gel or catfeed?
@@onoworemuriomen8163 Activated charcoal
@@GetMeOffGrid_ Thank you sir
Great video, you mentioned decommissioning the biodigester for winter because it was too expensive to heat. Why don't you heat it with a biogas heater?
With the new insulated housing, it is actually not at all expensive. Check it out here: th-cam.com/video/TJUqjQbnon4/w-d-xo.html
Thank you
You're welcome
thanks for your videos mate, there arent many of them in the uk, (probably because of the cold weather) couple of things ive seen are using a 12 heating element on a simple solar setup to heat the digester possibly, and ive seen some rigged up to a toilet in the us, question is, does human waste produce methane gas, as im not sure it does ? and lastly are you producing gas yet as its june and pretty warm, and looking forward to more of your videos but you need to up the volume a bit as sometimes you cant hear very well
cheers mate (from glasgow in scotland)
Hi Stephen. Thanks for watching. Yes the cold weather definitely is a barrier. The solar system is a definite option, problem is the cold is the main issue and its when the sun doesn't shine too much. Once I am happy with my digester I am hoping to play around with effectiveness of different things like that. On human waste, yes it does produce methane but from what I have read not as much. Also all the chemicals people use in their toilets does a good job at keep the good bacteria at low / non-existent levels. My digester isn't producing yet, I need to drain it, seed it and move it to a better spot but have been focusing on my other project recently. Once I have that all done it will be full steam ahead to get it up and running and producing gas so I can have a play with those other things. Cheers for the feedback on the volume, I'll try and get better, my gopro isn't an ideal camera for this unfortunately. Cheers Tom
One guy who replied said that he was going to put his in a small greenhouse, along with wood chip compost to keep it warm. (Your greenhouse needs a vent at the top to let out any gas that may escape)
Very nice setup! What do you do with your digestate? Is it just removed after a period of time or is it dehydrated and treated to produce fertilizer?
The plan will be to use it as a base for a hydroponics system and/or simple liquid fertiliser for vegetables. From what I know it doesn't need to be treated any more than watering down.
Thanks. Great content!! So how do we know when it's the right time to replace the water, car litter or the steel wool
The steel wool will look like it has rusted. So when that gets to over half I'd suggest it needs to be changed. Cat litter needs to be changed when it can no longer absorb moisture. Check out this video, for a set of scrubbers that are easier to check these things: th-cam.com/video/4HXgKTqT-l8/w-d-xo.html
Thank you so much for the video
Thanks for asking the question. I hope this video provided the information you wanted
@@GetMeOffGrid_ I planning to do biogas in big level I definitely take video and dedicate that video for you if iam successful, you are my inspiration.
I am happy that I can help people on their journey. That's really kind of you. Cheers
@@GetMeOffGrid_ Could you please let me know where are you from
Sure. I am from an area in the UK called the New Forest
I am very impressed by your work on modifying the biogas system to a cold climate. For a while, I was thinking about a single solution to purify both CO2 and H2S through a sustainable method. How about using NaOH or KOH solution to bubble through first? H2S becomes Na2S/K2S+H2O and CO2 becomes Na2CO3/K2CO3+ H2O. Then we can add a water container to bubble through to remove alkalinity in the gas in case. You can make the system locally sustainable if you use KOH solution made from wood-ash.
Interesting idea. I like the fact it could be homemade, using the wood ash. It doesn't reduce the number of scrubbers though, as if you use water to remove the alkalinity you would have to then remove any excess moisture using some dehydration: cat litter, charcoal etc.
@@GetMeOffGrid_ thanks for the reply. In fact KOH absorbs almost all the CO2 compared to just bubbling through water. So you will get less volume of gas which has high methane content. This helps reduce the storage space. You will get good clean burning.
Goodmorning Sir
Can I ask something?
This is for school purposes
Hi Tom, we are glad to witness the technical information also from the videos you are presenting. Here, I have small query that how would you scale up the digesters for about say 10-20 kgs of food waste and water should be the waste to water ratio to be added in the inlet .
Hi Sindhuja. I am glad you like the video. I am not sure what you mean about the waste to water ratio? If you are talking about how much water to add to the food you are putting in I am not sure there is a rule. I like to add around the same amount of water as food waste but volume. But it will vary depending on the food. Let me know if you need me to explain something any more. Cheers
@@GetMeOffGrid_ Thanks to you! Yeah what I meant was about how much water need to be added. Yes I got my answer here. Can you please provide me your mail id so that I can discuss with few more queries. Thanks in advance.
@@sindhujatalla2202 Sure no problem. My email is tomoffgrid@gmail.com
One resource that came up with a scientific number is Dickinson College Farm. th-cam.com/video/YvQAg838xGs/w-d-xo.html In there experiments they found that 5-10% solids to water ratio was the ideal to maintain PH balance and optimal gas production. Now that number is a bit tough to come up with because a lot of common kitchen waste already has water in it. So again the scientific way is to take a sample of your scraps, slowly dehydrate it at 105celsius for 24 hours and compare pre cook weight to post cook weight to get your solids content percentage. Example, if you take 500 grams for kitchen scraps, bake them as above and end up with 200 grams of scrap material, you have 40% solids. So then you can calculate how much water to scrap ratio. In this example you would need to add 1700 grams of water. 200 grams solids divided by 1700 added water plus original 300 water in the scraps equals 200/2000=.1 or 10% solids. You can find the college on TH-cam as well. Hope this helps and is totally not super necessary. You can swing it one way or the other by quite a bit and it will still work. We are just talking about going for max production.
Thanks for your videos they are very educative. Please, apart from the water in one of the scrubbers, what are the materials in the other 2 'jars'
That's very helpful as video. I'm learning English and I don't get yet a sharper listening. I'd like to see the orthography of the second bottle content that you have use instead of silica gel.
Hi, not sure exactly what you mean but in the description, I explain each bottle. Hopefully, you can find what you need there.
@@GetMeOffGrid_ I got it, It was cat litter that I was looking for. As you said in the video, cat litter is cheaper and more available than silica gel, isn't it?
Hi, Tom. I am from India. it's great to see ur work. what will you suggest as the best inoculum for solid-state anaerobic digestion, and how much volume should it be, for example for 1 L reactor, how much should be the volume of inoculum.
thank you. i hope your reply.
Hi Mothe. Thanks very much. I am not sure what you mean by "solid state"? Like the digester I have built or something different? If it like my digester then I'd advise 50%, might not be necessary to have that much but it will work well with that much
Hi, enjoyed your biogas videos enormously. I am in the UK and have always fancied a biogas system, but have been put off by the temperature problem. Did you finally manage to produce and use gas? The videos didn’t seem to indicate what finally happened. Also, did you consider using some sort of solar panel to run a heater? A small heater would be possible to rig up quite easily. Hope you can let me know.
Hi. Thanks very much. So far not enough gas to do anything with. I over fed it last year and it acidified. I have redesigned the system and now know how much or little I should feed it. I am getting it going again for this year. The temperature issue is the main challenge I think. A small solar heater could be an answer, or I'm thinking compost heater. Something low maintenance, low energy input.
@@deathbyslime6725 Yes that is true. It helps that the insinkerator can't chew up lemons and limes. I have to be careful with the oranges though as they can sometimes sneak in to the bin haha
Usefull video, i would like to ask if Whats the name of that powder that is cheaper than silica.thank you
Cat litter
Very cool. Why are there two “inputs” to the water filter? Thanks!
I had two outputs from my digester. Cheers
@@GetMeOffGrid_I was wondering the same thing
Those top pipe not airtight will d gas not leak out or have air ingress?
Sir, well don it's very good useful explanation about your project I wish you very mush success in it.
Greetings from Johan D. BELGIUM
Technical Engineer
Many thanks
I believe you should be using Iron oxide as the scrubber agent for Hydrogen sulfide rather than the Iron metal found in steel wool. You can burn the wool to react the metal with air and form the oxide.
Good job, is there any other alternatives to steel wool for the h2s scrubber? Thanks
Water will remove some H2S, I don't know of another way. I'm sure there must be though. If I come across one I'll let everyone know
I have collected tiny iron particles from creeks when panning for gold - I used a magnet to separate them from the other fine particles in the pan - maybe a jar of this?
Hi Tom! Can you show me the process of how to do that things? I know the process but I don't how to do it step by step. Where should I put the hose at the end? What is that storage tank? Sorry for a lot questions. I hope you will help me.
I have added chapters to the video description so hopefully you will be able to navigate to important bits of the video more easily. For more information about the biogas digester setup step-by-step check out this video: th-cam.com/video/Z9MTCFWTpyo/w-d-xo.html
Great vedio .I think adding lime to water (lime water) react easier with co2
Yeah. Adding lime would precipitate the CO2 into chalk. Definitely would work, unsure how it compares in terms of effectiveness
Great! Thanks. I have a question. How often should you change the water, cat litter and steel wool in the bottles?
That really depends on how much gas you are producing. At the moment I don't have any guidelines for this I'm afriad.
A byproduct you will have from the steel wool will be moss killer, it'd be better to put the dryer after that if you can find a use for it.
However do check if your country still allows the use of it, the law in Denmark for example stands that you can use it but can no longer buy it.
That's interesting. I hadn't even thought about using the waste products from the steel wool. Cheers
Thankyou for the video. How often do we have to replace the filtering materials?
It really depends on the amount of gas you are producing. If you check out my other scrubbers video, you will see I changed the design a bit to help with the monitoring of the materials. th-cam.com/video/4HXgKTqT-l8/w-d-xo.html
@tom - can you provide more details on the material used for the removal of Hydrogen Sulphide pls
It is iron wool. Sometimes used to clean metal. Any kind of iron shavings would work.
Love from India....💐🎊🎉
Many thanks
@@GetMeOffGrid_ most welcome
sorry ignore my last comment; your process sequence is correct; my own over sight
No worries. Thanks for watching 😊
hi, can an alkaline solution instead of distilled water when removing CO2 in the purification of methane.
Get it bro!
Cheers!
You are a good teacher! Now I'd really love know how to compress and use on generator:-)
Thanks! Hopefully I'll be able to get to that stage this year. I've got a video coming out soon with a upgraded 200lt digester. Once I have that running I'll be able to get to the compression stage! Cheers
Did you suceed with compress and using with generator?
What is the name of the other chemical used after water in the scrubber
how do you make sure the gas goes in and comes out through the correct tube. do you use any suction methods to ensure that?
The way the tubes are set, releasing the gas into the bottom of the container. The gas will then go up, as it is lighter than air and the pressure build up will push it through the next scrubber.
Hello I like your videos but I may have some questions like how much time it need to produce gas and I was facing problems with scrubbing it from these toxic gases hope you would answer and thank you any way
All these things are variable. Depends on the size of your digester, and the type of feed you are using. What problems are you having?
Nice job mate! I was wondering whether the water added inside the bio digester is suitable for removing CO2, as the bubbles go up though the water and in that way can remove the water scrubber?
I don't think so...that water will be a bacteria soup which I imagine would not be able to absorb much CO2, if it did it would become saturated and then would be useless anyway.
Question the left over product is dry to use as fertilizer and cat I use pet waste for bio gas and would the pet waste after it has been used for bio gas be a safe fertilizer
Using dog waste could be dangerous as it could have bacteria that can affect humans in. So if you the use it on food plants it could be transferred to you
@@GetMeOffGrid_ got you I assume would be sterile will have to do the experiment on a large cat shelter I support on central america, also if you keep ading manure and vegetables food scrap the system will keep running
Hi..can you please tell me what is the second white colour thing do use to remove the water,,if can mention product lint or its name
It is cat litter
Hello this video is amazing but i couldn't hear properly what material did you use for removing water vapour and sulfide, i have been using biogas since 2007 but couldn't start generator for power generation but now i can fix it by using your method to purify it thanks man
Hi Adil. I have updated the description and put the information there for you. Cheers
does the water need replacing? Also, does the cat litter become too moisture laden to work? Ditto for the steel wool?
Yes, yes and yes.
Please explain why you're not able to run this in the winter how cold is it where you're at in a winter that would be a problem if you wouldn't be able to use this year round
The digester needs to be at least 35 degrees C to work well. So in the winter, depending on your insulation and air temp it could be a lot of energy to keep that temp. Not a problem if you shut it down, might have to reboot with some cow manure in the spring.
Hi , what is the white material in the second cylinder (the moisture) .Is there alternatives easier to use ?
Check the description for more info
Dear Sir, Nice video. Is it first to reduce Co2, or should remove H2s first. Pls explain why co2 first .
Thank you. I chose to do CO2 first as next is the remove the water. This means that the water does not oxidise the steel wool. If you did H2S first the gas will have some water vapour in it from the digester. Does that help.
Once the filter medias are saturated how do you responsibly dispose of them? Also does the steel wool just turn to rust?
The steel wool does turn to rust. The cat litter can go in normal household waste. If you use activated charcoal it can be composted.
How often do you need to change the filters? Could you use a trompe to clean and pressurize the gas?
gr8 info...i have one question .i have built big digester (12feet diameter 7 feet high underground) now i am to the filteration plz suggest the size of tubes . m thinking 3 inch pvc pipes but couldn't get exact size info.on internet
It doesn't really matter the size of tubes. 3" would work fine.
@@GetMeOffGrid_ thnnxx ..will update soon
Hi, happy to see your video that actually searching for.
but is the entire project is still working? as what is the time you can use the methane after purifying by this method. What is your digester tank capacity?. Is CO2 can be removed by simply passing through the water without any pressure?
hope that you will answer me.
I was using this biogas 1Mcube capacity from 2010 onwards by putting kitchen waste only( 3-5kg)
If this is working will need to upgrade my biogas ..
Thanking you
Hi Navin. The CO2 can be removed by passing through just the water, yes. I would expect any biogas system to be pressurised from the tank towards the storage. It does not need to be pressurised more than that to use these scrubbers. The system will work continuously, you will need to change the water at some point as the water would get saturated with CO2 (that will become Carbonic acid). You will need to change the drying agent (silica or cat litter) when it gets saturated with water. You will also need to change the steel wool once that has all reacted with the H2S. You will be able to tell when the steel wool needs changing because it will be oxidised (turn brown). How long will this take? With a small digester like you have, it will be once at year or something like that.
@@GetMeOffGrid_ Thanks a lot Tom very much .i will definitely try when our lock down completes ... and will inform you....
@@GetMeOffGrid_I wonder if you could leave a suspended acid test strip in the water to be able to check the acidity. Or maybe a purple cabbage leaf.
.
thanks for your reply; when do you replace and/or how often do you replace the cat litter?
You will only need to change it when it has become saturated with water and therefore would not be able to absorb more moisture. When this is will depend on how much gas you are producing.
@@GetMeOffGrid_ thanks; great help; this project I am making will be the first in Qatar; hope I can do it right; I will share with you the complete process when it is completed; again thanks and bless you
another questin; Sequence of tanks; according to you; cat litter is used to dehydrate the gas; should'nt this be the last stage of the purification procsses; i.e. after the CO2 extraction tank ??
How fast will these filters need to be replaced? when does the water stop taking up co2, when is the cat litter too moist to take more water...
How long is a piece of string. It will all depend on how much volume of moist gas is moving through your system. I haven't got a good idea of any relationship between feed in a time on the filter change yet.
Thank bro i am plannig for large scale of biogas plant
Nice! Where in the world are you doing that? This might be of interest to you...my latest scrubber upgrade: th-cam.com/video/4HXgKTqT-l8/w-d-xo.html
@@GetMeOffGrid_ i am from india sir i am going to plan 1.3 tdp biogas plant for my bussness
@@hiteshpatel4567 Very nice! Very cool, good luck with it
Can you pls state what you used to clean the methane I could not hear properly you said water but what was the other two pls
Hi Kojo. If you can't hear you could use subtitles (CC), the other two are cat litter and steel wool
@@GetMeOffGrid_ thanks for replying
Dear Tom Thanks For Your Nice Video🥀With this gas you can show me how to run an LPG engine Or Motorcyle Engine Please
Hi. I am glad you liked it. To be honest I am not sure about running engines. I am not a mechanic but I know people have converted cars to run on biogas so it definitely can be done. I quick search on Google suggested it is not too difficult but again I am not sure on the details. Sorry I can't be of more help.
Does the order in which the purification done matter?
How do you replennish the CO2 reaction in water? Maximum von entrationbwill be reached and then? Baking Soda? Calcium containing chalk-Rock? Regular change of water?thanks
Can you please tell me if this system works for acid fumes like nitric acid or bromine ? I want to install one to my fume hood but I am so confused, nobody can give me a clear answer. I would greatly appreciate an answer from you thanks !
I am not a chemist so not really familiar with those chemicals. A quick search on Google tells me that if you add lime to the water you can neutralize the nitric acid. Bromine looks like a much more complex chemical so you will have to your own research on that one.
@@GetMeOffGrid_ thank so much for replying, at least now I know it's possible for nitric acid but yes I'll continue my research.
Sir how connections done for purification process ?
Kindly make short to guide
th-cam.com/video/4HXgKTqT-l8/w-d-xo.html
But can the CO² be seperated and using for other applications?
The quick answer is yes. A few options, either increasing the pH to above 85 or by adding soda ash. I've never done it though so can't say how easy or effective either would be.
Do you allow people to visit you biogas processing place? I got a questions on biogas as I'm interested in doing a biogas project
Sorry I don't. There's really not much to see at the moment. Plus its not on my property.
I understand but I will make a formal request to the owner of the property for education purpose of me. I live in England and I don't mind traveling.
Not sure it works like that my friend. Try these guys I know they run course: facebook.com/BeeviewFarm
This is interisting Idea, I want to create something like this in Philippines where I lived. Because it has a warm climate. And also I want to ask how to use biogas to generator, what generator is possible for biogas to turn into electricity.
Most generators can be used with biogas. Petrol generators can be adapted or you can use specailised gas powered generators.
Did you find the water siphoning back into the digester when ever its temperature droped? The fix would be another empty jar before the water jar. Digester into top of the empty jar and water jar fed from bottom of empty jar.
I didn't find that, although, the digester itself never really got working properly.
Hi sir good day. I want to know more about biogas system and Anaerobic. I want to contruct one in our house for cooking. Can I have your guidance sir please.
How can I help you?
Hello, For what surface of the container can they be used and for how long can these filters be used? How do we know when they need to be changed ? Thank you !
Hi Alqi. I am not sure what you mean about the surface of the container? On how long until they need to be replaced, I am not sure, it will depend on how much gas you are producing. I would suggest every 6 months or so for a small digester but that is just an educated guess. I am hoping to be able to test this at some point in the future.
@@GetMeOffGrid_ Thank you, great chanel !
@@alqiloli3273 Thanks!
Goodmorning Sir, it is uses an air pump?
No its passive
Hi is it possible to compress gas into liquid form.
Regards Martin steele
Yes. You just need sufficient power to compress it. Not really recommended though as it would become really volatile.
@@GetMeOffGrid_ Hi and thank you for your reply. When yu say not recommended as it would become volatile,can yu elaborate please and ca you reccomend a suitable preasure.
Regards Martin steele
Hi Tom,
Also pls tell that do we need to change water, cat litter, wire wool after certain period of their usage,,,bcoz if these materials are scrubbing unwanted gases n holding them inside then there must be a life for these materials...
I hope I have asked the right question...
If not pls revert, I shall try to ask it in more detail...
Hi. It is very difficult to say to be honest. It will all depend on the amount of gas you are producing and also the feed you are putting into the digester. The wire wool will visibly change and start to degrade. The water you could do a pH test and when it starts to get to a low pH change the water. This would mean the water is becoming saturated with carbonic acid from the carbon dioxide. The cat litter would have to be a visible check. I would guess they should all last at least 6 months if you are just using it for a small household digester. Hope that helps
Hi Sir greetings from India. I want to know that how much electricity is needed to bottling the 20 kg bio cng into cylinder.
Hi Ajit. I am not sure to be honest. I haven't tried that yet. I'll make a video of it all when I can.
Thanks; how do you vent out and get rid of the CO2 without loosing the Methane??
another question; how much these pipes sealed; it looks that you will have gas leaks ??
CO2 is dissolved in the water so does not need to be vented. Just replace the water ever so often. Not sure how long, it will depend on how much gas you are producing. The pipes should be sealed better, these pipes are sealed but not as well as they should be.
@@GetMeOffGrid_I'm worried about your filter set up inside the building - do you have a high vent just in case?
I didn't get d name of d gas drier you mentioned
Can dry sand be a good alternative for cat litter
It could be. Personally, if I couldn't get cat litter I'd use charcoal.
would this get rid of odor in biogas
Is there a reason why you place the steel wool scrubber last? Why not first, then the water, then the dehydration?
I think you could justifiably do it either way around. I chose to do it last so there is less chance of the wool being corroded by moisture and rusting.
@@GetMeOffGrid_ Thanks. Makes sense. Just thought you’d get residual h2s in your water and kittylitter.
I think you would for sure, but I don't think thats a bad thing. The water will act as a "pre-filter"
How often do you need to change the water, liter and iron wool?
Hi Diultu, Thanks for watching the video. I have answered that one in a recent comment, feel free to search down and have a look. Cheers
Do you ever have to change the cat litter, water or steel wool?
Yes
I wonder if using high ph water like giving the filter a calcium carbonate bottom with lots of strontium , would purify hydrogen sulfide well too
Interesting. What would you uses as the source of strontium. Can't say I've ever seen or heard it in the shops.
@@GetMeOffGrid_ aquarium stores have crushed coral that is high in strontium
So do you use steel wool or iron wool? Does it make a difference?
To be honest I think the proper word, at least in the UK, is wire wool. As long as it has iron in it will react with the H2S
Steel is a processed form of iron. I believe for this process they are essentially the same, but one has more carbon in the metal. I've only heard it called 'steel wool' but I suppose there could be brands that are called 'iron wool'
I am into hydroponic farming, and want to use the CO2 in a controlled enclosed environment during the day. How can I extract CO2 gas from the water? (2) It appears like low temperatures slow down the production of methane gas. What is the optimal temperature level to maximize gas production?
Hi. As I sure you know, as you are a hydroponic farmer, CO2 dissolves in water to for carbonic acid. It is quite difficult to get carbon dioxide back out of the water. You could boil it? But its quite energy intensive. Optimal temperatures are 35-40 degrees C.
stp la litière de chat est composer de quoi?
et le fait que tu utilise c'est comment?
It depends what type of cat litter you use. Clay and wood, normally. Things that are dry and will expand when made wet. It will remove the moisture from the gas.