SV 30 क्या होता हैं||SV -30 Waste Water Treatment|Settling Volume Of Activated Sludge Areation Tank

[@VishalVishal-nx7ct]

Sir ek video DO pr please

[@vikrantsingh5008]

@@VishalVishal-nx7ct thanku so much bro DO pe already video banaya hu lab chemistry wali playlist me hai mere channel pe aap bol rahe ho to mai fir bana duga DO pe video