Anoxic bio-electrochemical system for treatment of complex chemical wastewater with simultaneous bioelectricity generation.
Bioelectrochemical treatment system (BET) with anoxic anodic microenvironment was studied with chemical wastewater (CW) in comparison with anoxic treatment (AxT, sequencing batch reactor (SBR)) with same parent anaerobic consortia. BET system documented relatively higher treatment efficiency at higher organic load (5.0 kg COD/m(3)) accounting for COD removal efficiency of (90%) along with nitrate (48%), phosphate (51%), sulphates (68%), colour (63%) and turbidity (90%) removal, compared to AxT operation (COD, 47%; nitrate, 36%; phosphate, 32%; sulphate, 35%; colour, 45% and turbidity, 54%). The self-induced bio-potential developed due to the electrode assembly in BET resulted in effective treatment with simultaneous bioelectricity generation (631 mA/m(2)). AxT operation showed persistent reduction behaviour, while simultaneous redox behaviour was observed with BET indicating balanced electron transfer. BET operation illustrated higher wastewater toxicity reduction compared to the AxT system which documents the variation in bio-electrocatalytic behaviour of same consortia under different microenvironment.
Bioengineering and Environmental Centre (BEEC), CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500 007, India.
G
G
Velvizhi
R Kannaiah
RK
Goud
S
S
Venkata Mohan
D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D001674:Bioelectric Energy Sources; D004560:Electricity; D055664:Electrochemical Techniques / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification / Q000633:toxicity; D018508:Water Purification / Q000379:methods*
D062065:Wastewater; D014874:Water Pollutants, Chemical
Bioelectricity; Microbial fuel cell (MFC); Nitrates; Sequencing batch reactor; Sulphates