The concentration of biodegradable organic matter after the septic tank is ___________
(a) 50ppm
(b) 100ppm
(c) 200ppm
(d) 75ppm
I have been asked this question by my school teacher while I was bunking the class.
Enquiry is from Construction of Septic Tank topic in section Solid Waste Management, Aerobic & Anaerobic Stabilization Units of Environmental Engineering