(Q4)-E QUESTION 4 The Chaudhari et al paper discussed in this course is concerne
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(Q4)-E
QUESTION 4 The Chaudhari et al paper discussed in this course is concerned with the treatment of spent wash water coming from a molasses-based alcohol distillery. This spent wash is dark brown in colour and has very high levels of COD (up to 200 kg/m and BOD (up to 75 kg/ms). Around 15 ms of spent wash are formed per m3 ethanol produced. This stream is sent first to an anaerobic reactor which greatly reduces its organic load (quoted values for the biodigester effluent are COD 38,800 mg/L, BOD 7,200 mg/L).Explanation / Answer
The biodigester effluent has COD and BOD values which are much higher than the disposal standard of 30mg/l for surface water disposal.Hence,the effluent is to be treated furthur.BOD/COD=7200/38800=0.815.Thus it is a low strength waste water and aerobic treatment can be used for it.Aerobic system can bring it down upto 20-30mg/l which is then safe for disposal.However,colour will persist.Coagulation helps to remove colour.Electro-coagulation is even more effective than chemical coagulation.Hence,I feel coagulation is a better option.
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