Question

List few advantages and disadvantages of anaerobic waste water treatment in form of table, to handle waste water generated from large scale Ethanol refinery from sugar beet.

Answer 1

Advantages	Disadvantages
High reduction of BOD(Biochemical oxygen demand).	Treatment may be unsatble with variable hydraulic and oroganic lods.
Effluent is rich innutrients and can be used for agricultural irrigation	requires expert design and construction
Reduction of CH4 and CO2 emission	Not adapted for cold regions
Low land demand, can be constructed underground with locally avilablea material	effluent and sludge require further treatment and appropriate discharge
Can withstand high oraganic and hydraulic loading rates	requried operation and maintenance by skilled personnel; difficult to maintain proper hydraulic condition
Low sludge production (and, thus , infrequent desluding required)	Long start-up time to work at full capacity
Biogas can be used for energy (but usually first requires scrubbing)	A constant source of electricity is required
No areation system required (thus little energy consumption)	Not all parts and materials are locally available