[Characteristics of sulfate reduction-ammonia oxidation reaction].
The sulfate reduction-ammonia oxidation reaction with ANAMMOX sludge at autotrophic condition was implemented. It was found that the pH level decreased during the reaction. Elemental sulfur and nitrogen gas were the final products, while NO3(-) -N was the intermediate product during the sulfate reduction-ammonia oxidation reaction. The conversion ratio of NH4(+) -N/SO4(2-) -S decreased with the decrease in n(N)/n(S) (molar ratio) of raw water. n(N)/n(S) of raw water had little effect on the ammonia conversion ratio. Lower n(N)/n(S) could improve the SO4(2-)-S conversion ratio, but with more NH4(+) -N oxidized into NO3(-) -N, resulting in decreased n(TN)/n(TS) removal ratio. This indicates that the sulfate reduction-ammonia oxidation reaction is not an elementary reaction. Ammonia can be oxidized into NO2(-) -N or NO3(-) -N by sulfate. Shortening the reaction time would be conducive to nitrogen losses, because the reaction of NO3(-) -N production is the rate-limiting step.
School of Environmental Science and Engineering,Tongji University, Shanghai 200092, China. yiyuansuzhou@163.com
Yi
Y
Yuan
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China.
Yong
Y
Huang
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China.
Xiang
X
Li
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China.
Chun-Lei
CL
Zhang
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China.
Li
L
Zhang
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China.
Yang
Y
Pan
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China.
Fu-Xin
FX
Liu
D000641:Ammonia / Q000737:chemistry*; D007477:Ions; D009584:Nitrogen / Q000737:chemistry; D010084:Oxidation-Reduction; D012722:Sewage / Q000737:chemistry*; D013431:Sulfates / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods
D007477:Ions; D012722:Sewage; D013431:Sulfates; D000641:Ammonia; D009584:Nitrogen