[Study on the biotransformation of sulfate and ammonia in anaerobic conditions].
The anaerobic biological transformation characteristics of sulfate and ammonia were investigated in the upflow anaerobic biofilm reactor under inorganic nutrition condition by controlling different hydraulic retention time, NH4(+)-N and SO4(2-)-S ratio and HCO3- concentration in the influent. The results showed that NH4+ and SO4(2-) were synchronously removed. The maximum NH4(+) -N and SO4(2-) -S removal rate was 47.6 mg x (L x d)(-1) and 16.9 mg x (L x d)(-1), respectively, and the highest stable removal efficiency was more than 80% and 43%. Obviously NO3(-) -N generated in the reaction and the maximum NO3(-) -N concentration was 77.6 mg x L(-1) in the effluent. Throughout the process S2- was not detected, but there was elemental sulfur generated attached to the surface of the biological sludge. During the whole process, different control conditions led to different n(NH4(+) -N) and n(SO4(2-) -S) conversion ratios, which showed that anaerobic biological NH4(+) and SO4(2-) transformation was not a simple serial reaction, more complex reactions and conversion pathways occurred in the reactor.
School of Environmental Science and Technology, Suzhou University of Science and Technology, Suzhou 215011, China. helene25@163.com
Li
L
Zhang
School of Environmental Science and Technology, Suzhou University of Science and Technology, Suzhou 215011, China.
Yong
Y
Huang
School of Environmental Science and Technology,Tongji University, Shanghai 200092, China.
Yi
Y
Yuan
School of Environmental Science and Technology, Suzhou University of Science and Technology, Suzhou 215011, China.
Xiang
X
Li
School of Environmental Science and Technology, Suzhou University of Science and Technology, Suzhou 215011, China.
Fu-Xin
FX
Liu
D000641:Ammonia / Q000378:metabolism*; D018441:Biofilms; D019149:Bioreactors; D001711:Biotransformation; D012722:Sewage / Q000737:chemistry; D013431:Sulfates / Q000378:metabolism*; D014865:Waste Disposal, Fluid / Q000379:methods
D012722:Sewage; D013431:Sulfates; D000641:Ammonia