不同厌氧方式对连续流亚硝化恢复的影响

摘要

为探究不同厌氧运行方式对亚硝化恢复的影响，在常温（20±2）℃下，采用两组两级连续搅拌反应器（CSTR）1＃和2＃，实验分为S1、S2和S3三个阶段．在S1阶段1＃采用厌氧／厌氧运行（两级DO均为0～0．1 mg／L），2＃采用厌氧／好氧运行（两级DO分别为0～0．1和0．6～0．8 mg／L）；在S2阶段1＃转变为好氧／好氧运行（两级DO分别为0．2～0．4和0．6～0．8 mg／L），2＃保持厌氧／好氧不变（两级DO分别为0～0．1和0．6～0．8 mg／L）；在S3阶段，研究恢复后亚硝化的稳定性，此时1＃、2＃两级DO均为1．0～1．2 mg／L．分别对此过程中亚硝化的恢复时间以及恢复后稳定性进行比较．结果表明，1＃的恢复时间比2＃缩短了12 d，但当溶解氧增加到1．0～1．2 mg／L时，2＃恢复后的亚硝化更稳定．先厌氧／厌氧（两级DO均为0～0．1 mg／L）后好氧／好氧运行（两级DO分别为0．2～0．4和0．6～0．8 mg／L），有利于亚硝化的快速恢复，恢复后转变为厌氧／好氧运行（两级DO分别为0～0．1和0．6～0．8 mg／L）有助于亚硝化的长期稳定运行．%To investigate different effects of anaerobic modes on recovery of partial nitrification ( PN), two⁃stage continuous stirred⁃tank reactors (CSTR)1#and 2#were used at room temperature (20±2) ℃. The experiment had three stages(S1,S2 and S3).During S1,1#was maintained anaerobic/ anaerobic(DO:0-0.1,0-0.1 mg/L),2#was maintained anaerobic/oxic(DO:0-0.1,0.6-0.8 mg/L). During S2,1#was maintained oxic/oxic (DO:0.2-0.4, 0.6-0.8 mg/L),2#was continually maintained anaerobic/oxic(DO:0-0.1, 0.6-0.8 mg/L). To investigate stability of PN after recovery,S3 was carried out. During S3, 1#and 2#was maintained oxic/oxic(DO:1.0-1.2,1.0-1.2 mg/L)The following paremeters (time of recovery of PN and stability of PN) were investigated. It demonstrated that the recovery time of 1#was shorter than that of 2#by 12 d. However, PN in 2#was more stable when DO increased to 1.0-1.2 mg/L. Efficient PN could be recovered by the mode of first anaerobic/ anaerobic ( DO:0-0. 1, 0-0. 1 mg/L ) then oxic/oxic ( DO:0. 2-0. 4, 0. 6-0.8 mg/L). Afterwards, stable PN could be maintained by anaerobic/oxic(DO:0-0.1,0.6-0.8 mg/L).