_The main type of sludge gas evolved during sewage treatment in Imhoff – McqOptions

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1.	_The main type of sludge gas evolved during sewage treatment in Imhoff tank is$?
A.	CO‚Äö√á√á
B.	CH‚Äö√á√ë
C.	CO
D.	H‚Äö√á√á
Answer» C. CO

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