Nitrogen balance and transformation in the nitrification process of coking wastewater and the influence on nitrification kinetics.
This paper describes the total nitrogen balance, and the direction and degree of nitrogen transformation during the nitrification process of coking wastewater. According to the actual nitrification process, the conventional nitrification kinetic equation was amended. After 48 h of nitrification, the total nitrogen content remained almost the same with error less than 0.6%. The total removal efficiency of NH4(+)-N was 91.1%, in which blow-off, producing cells and transforming to nitrate nitrogen accounted for 1.1, 17.8 and 72.2% respectively. Considering the influences of NH4(+)-N blow-off and conversion from cyanide, thiocyanide and organic nitrogen, the nitrification kinetic equation was amended as μ'=0.82·S/(0.48+S).
College of Water Sciences, Beijing Normal University, Beijing 100875, China E-mail: shanmj@126.com; Beijing Water Business Doctor Co., Ltd, Beijing 100875, China.
Mingjun
M
Shan
College of Water Sciences, Beijing Normal University, Beijing 100875, China E-mail: shanmj@126.com.
Yan
Y
Zhang
College of Water Sciences, Beijing Normal University, Beijing 100875, China E-mail: shanmj@126.com.
Lihong
L
Kou
D019652:Extraction and Processing Industry; D007220:Industrial Waste; D007700:Kinetics; D058465:Nitrification; D009584:Nitrogen / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry*
D007220:Industrial Waste; D009584:Nitrogen; D062065:Wastewater