Biodetoxification of silver-cyanide from electroplating industry wastewater.
A bacterial consortium capable of utilizing metal-cyanides as a source of nitrogen was used to develop a microbiological process for the detoxification of silver-cyanide from electroplating wastewater. When the treatment was carried out in a 27-l rotating biological contactor (R3C) in continuous mode, the system could achieve > 99.5% removal of 0.1 mmol l(-1) silver-cyanide (approximately 5 mg l(-1) cyanide and 10 mg l(-1) silver) in 10 h with sugarcane molasses (0.1 ml l(-1)) as carbon source. The silver ions set free during biodegradation were efficiently adsorbed by the bacterial biomass. The RBC-treated effluent was found to be safe for discharge into the environment, as confirmed by chemical analysis and fish bioassay studies.
Patil
Y B
YB
Division of Microbial Sciences, Agharkar Research Institute, Pune, India.
Paknikar
K M
KM
D000818:Animals; D001673:Biodegradation, Environmental; D001681:Biological Assay; D019149:Bioreactors / Q000382:microbiology*; D002954:Citrobacter; D003486:Cyanides / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D008669:Metallurgy; D011036:Poecilia; D011549:Pseudomonas; D018030:Silver Compounds / Q000032:analysis*; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000378:metabolism
D003486:Cyanides; D018030:Silver Compounds; D014874:Water Pollutants, Chemical