title: Denitrification of coking wastewater with micro-electrolysis.
abstract: The denitrification for the coking wastewater was conducted by means of original battery principle with Fe-C micro-electrolysis. Fe-C serves as positive and negative electrodes, by which N02(-)-N and TN were reduced to nitrogen, and then the purpose of denitrifieation for coking wastewater was realized. The influences of pH value, carbon particle size, Fe/C ratio (mass ratio), reaction time and coagulation pH value on removal rate of N02(-)-N and TN were investigated. Coking wastewater originated from Jiamusi Coal Chemistry Engineering Company. The optimum conditions of treatment were as follows: the initial pH was 3.0, the dosage of Fe 73.5 g/L, reaction time 70 min, mass ratio of Fe/C ratio 1.0:1.3, coagulation pH 9.0 and sedimentation time 40 min. Under those conditions, nitrogen removal efficiencies of N02(-)-N and TN were beyond 50% and 45%, respectively.
authors.affiliation: School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, China.
authors.forename: Yanli
authors.initials: Y
authors.lastname: Lv
authors.forename: Yanqiu
authors.initials: Y
authors.lastname: Wang
authors.forename: Mingjun
authors.initials: M
authors.lastname: Shan
authors.forename: Xue
authors.initials: X
authors.lastname: Shen
authors.forename: Ying
authors.initials: Y
authors.lastname: Su
mesh_terms: D002244:Carbon / Q000737:chemistry; D003077:Coke / Q000032:analysis*; D058440:Denitrification; D004572:Electrolysis / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry; D010316:Particle Size; D013997:Time Factors; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000737:chemistry*; D060753:Water Quality
chemical_list: D002244:Carbon; D003077:Coke; D007501:Iron; D062065:Wastewater