硫酸盐/氨的厌氧生物转化试验研究

采用厌氧上流式生物膜反应器,通过控制不同的水力停留时间、进水n(NH+4-N)/n(SO2-4-S)和HCO-3浓度研究了无机营养条件下硫酸盐/氨的厌氧生物转化特性.结果表明,反应器中NH+4和SO2-4发生了同步去除,最大NH+4-N和SO2-4-S去除速率分别为47.6 mg·(L·d)-1和16.9 mg·(L·d)-1,稳定去除率最高分别超过了80%和43%;反应过程中有NO-3-N的明显生成,出水NO-3-N浓度最大时为77.6 mg·L-1,整个过程中,未检测到S2-的生成,有单质硫附着在生物污泥表面;由于控制条件的不同,会产生不同的n(NH+4-N)/n(SO2-4-S)转化比,表明NH+4和SO2-4的厌氧生物反应并不是简单地接续反应,反应器中存在更为复杂的反应过程和转化途径.

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·(L·d)^-1 and 16.9 mg·(L·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. L^-1 in the effluent. Throughout the process S^2- 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.