EGSB反应器处理发酵废水效能影响研究  

Performance of the Combined EGSB Reactor Treating Fermentation Wastewater

作　　者：高靖伟 程翔[1] 封莉[1] 张立秋[1] 

机构地区：[1]北京林业大学环境科学与工程学院,北京市水体污染源控制技术重点实验室,北京100083

出　　处：《环境科学与技术》2015年第9期141-146,161,共7页Environmental Science & Technology

基　　金：国家水体污染控制与治理科技重大专项(2013ZX07201007-003-01)

摘　　要：实验采用厌氧膨胀颗粒污泥床(EGSB)反应器先后对模拟发酵废水和实际发酵废水进行处理。考察了配水阶段硫酸盐负荷(SLR)对EGSB反应器净化效能的影响,并对实际发酵废水的处理效果进行了研究。实验结果表明:控温条件下((35±1)℃)、进水COD约为2 200 mg/L、水力停留时间(HRT)15 h时,COD去除率可达92%。随着SLR增加,COD去除率降低,当SLR为1.3 kg SO42-/(m3·d)时,反应器出现酸化。为保证反应器的稳定运行,延长HRT至24 h后,COD、SO42-去除率可分别达到90%、82%左右。同样条件下,EGSB处理实际发酵废水,COD、SO42-去除率分别为75%、60%。配水和原水阶段硫酸盐还原菌所能达到的最高电子流比重分别为21.1%、17.5%,对应的最低COD/SO42-为3.0,此时整个反应系统竞争最为激烈,但产甲烷菌仍保持较高竞争性。A lab-scale anaerobic expanded granular sludge bed （EGSB） reactor was adopted to treat the simulated fermentation wastewater and the actual fermentation wastewater. The sulfate loading rate （SLR） on the treatment effect of EGSB and the performance of actual fermentation wastewater treatment was investigated. The results showed that EGSB was effective in removing organic pollutants of the simulated fermentation wastewater under mesophilic condition of （35±1） ℃, hydraulic retention time （HRT） 15 h, COD removal reached 92% when the influent COD was around 2 200 mg/L. With the increase of SLR, COD removal efficiencies reduced. When the SLR was 1.3 kg SO4^2-/（m3 .d）, the reactor acidification occurred. HRT should be extended to 24 h so as to guarantee the stable of the reactor, and COD and SO4^2- removal efficiencies were 90% and 82% under this condition, while the efficiencies of COD and SO4^2- for the actual fermentation w. astewater were 75% and 60% respectively. During the running process of the system, the largest percent electron flow which sulfate reducing bacteria were achieved at 21.1% and 17.5% for simulated fermentation wastewater and actual fermentation wastewater, while the corresponding lowest COD/SO4^2- value was about 3.0. At this time, the whole reaction system is the most competitive, but the methanogens still remain high competitive.

关 键 词：发酵废水 膨胀颗粒污泥床 硫酸盐负荷 电子流 

分 类 号：X703.1[环境科学与工程—环境工程]