title: [Research on removal efficiency of Cd (II)-bearing wastewater by sulfate-reducing biological filter].
abstract: At the temperature of 18.0-22.3 degrees C, biological carriers were produce from pure SRB and zeolite by the embedding immobilized method, and a sulfate-reducing biological filter filled with filter carriers was built to treat cadmium-containing wastewater. Experimental research on removal efficiency of Cd2+, COD and SO4(2-) in wastewater by the biological filter was carried out after SRB domestication. Results show that cadmium can be removed satisfactorily from wastewater using SRB by the biological filter filled with sulfate-reducing bacteria. When the filtration rate was 0.4 m x h(-1) and the cadmium concentration in wastewater was not more than 15 mg x L(-1), the processing efficiency was the best. In the formal running period, the removal rates of Cd2+, COD and SO4(2-) by the biological filter were more than 99%, 75% and 50%. The effluent Cd2+ concentration was less than 0.1 mg x L(-1), which could meet the cadmium emission requirements in the wastewater quality standards for discharge to municipal sewers (CJ 343-2010). The removal of Cd2+, COD and SO4(2-) by biological filter mainly occurs in the top 60 cm of the filter bed during stable operation. When the filtration rate was less than 0.6 m x h(-1), Cd(2+) can be removed by the biological filter with high efficiency and stability.
authors.forename: Xuan
authors.initials: X
authors.lastname: Wu
authors.forename: Ke-Yan
authors.initials: KY
authors.lastname: Tan
authors.forename: Xi-Jia
authors.initials: XJ
authors.lastname: Hu
authors.forename: Yun
authors.initials: Y
authors.lastname: Gu
authors.forename: Hong
authors.initials: H
authors.lastname: Yang
mesh_terms: D001673:Biodegradation, Environmental; D002104:Cadmium / Q000737:chemistry*; D018914:Cells, Immobilized; D005374:Filtration / Q000379:methods*; D013431:Sulfates / Q000737:chemistry*; D016999:Sulfur-Reducing Bacteria; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D017641:Zeolites / Q000737:chemistry
chemical_list: D002104:Cadmium; D013431:Sulfates; D062065:Wastewater; D014874:Water Pollutants, Chemical; D017641:Zeolites