温度对间歇曝气SBR短程硝化及硝化活性的影响

Effects of Temperature on Shortcut Nitrification and Nitrification Activity of Nitrification in an Intermittent Aeration Sequencing Batch Reactor

采用SBR反应器处理实际生活污水,单周期分别交替4次(30℃)和7次(18℃)好氧/缺氧模式,好氧/缺氧时间比为30min/30 min.进水氨氮和亚硝氮浓度为61.44 mg·L^(-1)和0.77 mg·L^(-1),分别运行61和90周期时,出水氨氮分别为0.68mg·L^(-1)和1.28 mg·L^(-1),氨氮去除率高达98.94%和99.57%;亚硝氮积累浓度达到20.57 mg·L^(-1)和20.18 mg·L^(-1),亚硝氮积累率分别达到95.92%和99.58%.在实现短程硝化过程中,氨氧化菌(AOB)活性逐渐增加最后稳定在100.00%左右,而亚硝酸盐氧化菌(NOB)活性先增加后逐渐降低,分别在32和74周期时,AOB活性超过NOB活性,AOB成为优势菌种,61和90周期时NOB活性被完全抑制.

Real domestic sewage was treated with sequencing batch reactors（SBR）.The aerobic/anoxic modes were alternated 4 times at 30℃ and 7 times at 18℃ in a single-cycle,respectively,and the ratio of aerobic/anoxic cycles was 30 min/30 min.The influent concentration of ammonia and nitrite was 61.44 mg·L^-1 and 0.77 mg·L^-1,respectively.After the experiments were run for 61 and 90 cycles,the effluent of the ammonia was 0.68 mg·L^-1 and 1.28 mg·L^-1 and the removal rate for ammonia was 98.94% and 99.57%,respectively.The nitrite concentrations were 20.57 mg·L^-1 and 20.18 mg·L^-1,and the nitrite accumulation rate reached 95.92%and 99.58%,respectively.During shortcut nitrification,the activity of the ammonia oxidizing bacteria（AOB） increased gradually before finally stabilizing at 100.00%,however the activity of nitrite oxidizing bacteria（NOB） increased first and then decreased gradually,the activity of AOB exceeded NOB at 32 and 74 cycles respectively,where the AOB became the dominant bacteria and the activity of NOB was completely inhibited at 61 and 90 cycles.