内回流对UniTank工艺系统性能的影响研究
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摘要
通过构建UniTank小试装置处理赣南地区低碳源城市污水,考察内回流变化对UniTank工艺脱氮除磷性能的影响及边池搅拌时间内N、P含量的动态变化。结果表明,随着内回流体积比(R)的增加,TN去除率呈现先增加后减少趋势,TP去除率逐渐降低,内回流比对COD、NH_3~-N去除效果影响较小;当R为100%时,出水COD和NH_3~-N、TN、TP的质量浓度平均分别为23.39 mg/L和0.84、8.19、0.69 mg/L,除TP外,均达到了GB 18918-2002一级A标准。当R为100%时,边池反硝化现象最为明显;当设置内回流时,边池较难形成厌氧释磷的环境。
The laboratory equipment of UniTank process was set up to treat domestic wastewater in Gannan area, and the effect of internal recycle on the denitrification and phosphorus removal of Uni Tank process and N and P content dynamic change during stirring time was investigated. The results showed that, with the increase of internal reflux volume ration R, the change trend of the removal rate of TN was first increased and then decreased, and the removal rate of TP gradually decreased, while the internal recycle had little effect on the removal efficiency of COD and NH_3~-N. When R was 100%, the effluent COD and mass concentration of NH_3~-N, TN, TP average was 23.39 mg/L and 0.84, 8.19, 0.69 mg/L respectively, which met the first A standard of GB 18918-2002 except TP. The nitrification phenomenon was most obvious when R was 100%. The side tank was hardly form anaerobic phosphorus release environment when the internal reflux was set.
The laboratory equipment of UniTank process was set up to treat domestic wastewater in Gannan area, and the effect of internal recycle on the denitrification and phosphorus removal of Uni Tank process and N and P content dynamic change during stirring time was investigated. The results showed that, with the increase of internal reflux volume ration R, the change trend of the removal rate of TN was first increased and then decreased, and the removal rate of TP gradually decreased, while the internal recycle had little effect on the removal efficiency of COD and NH_3~-N. When R was 100%, the effluent COD and mass concentration of NH_3~-N, TN, TP average was 23.39 mg/L and 0.84, 8.19, 0.69 mg/L respectively, which met the first A standard of GB 18918-2002 except TP. The nitrification phenomenon was most obvious when R was 100%. The side tank was hardly form anaerobic phosphorus release environment when the internal reflux was set.
引文
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[2]李凌云,雷明,陶涛,等.UNITANK工艺厌氧环境的试验研究及工艺优化[J].中国给水排水,2006,22(9):86-89.
[3]陈婉如,张勇,崔松阳.提高UNITANK工艺去除氨氮效能的研究[J].中国给水排水,2011,27(11):84-87.
[4]雷明,张勇,徐廷国,等.UNITANK工艺强化生物除磷运行矩阵的确定[J].工业水处理,2011,31(9):41-43.
[5]邱育真,李银波,周少奇,等.UNITANK工艺运行效果研究分析[J].环境科学与技术,2010,33(1):124-127.
[6]陆杰,徐高田.UNITANK+接触氧化工艺处理制皂废水[J].环境科学与技术,2001,24(5):23-25.
[7]吉芳英,周峰,范剑平,等.降雨过程对污水处理厂无机颗粒物特性及活性污泥的影响[J].环境工程学报,2016,10(9):4643-4648.
[8]YAN X,HAN Y,LI Q,et al.Impact of internal recycle ratio on nitrous oxide generation from anaerobic/anoxic/oxic biological nitrogen removal process[J].Biochemical Engineering Journal,2016,106:11-18.
[9]董姗燕.上海石洞口污水厂Uni Tank工艺计算机仿真与优化研究[D].上海:华东理工大学,2007.
[10]CHUNG J,KIM G,SEO K W,et al.Effects of step-feeding and internal recycling on nitrogen removal in ceramic membrane bioreactors,and their hydraulic backwashing characteristics[J].Separation&Purification Technology,2014,138:219-226.
[11]李培,潘杨.A2/O工艺内回流中溶解氧对反硝化的影响[J].环境科学与技术,2012,35(1):103-106.
[12]李松汾.包钢(集团)公司污水再生回用工程可行性研究[D].西安:西安建筑科技大学,2006.
[13]童飞,周振,陈思维,等.一体化活性污泥法(Unitank)工艺同步加药除磷试验[J].净水技术,2013,32(1):15-18.
[14]董姗燕,汪喜生,王文佳,等.Uni Tank工艺流程中磷酸盐浓度的非稳态特征[J].环境化学,2007,26(1):1-4.
[15]胡学斌,杨柳,吉芳英,等.低碳源城市污水的低氧同步脱氮除磷研究[J].中国给水排水,2009,25(13):16-19.
[16]SONG K G,CHO J,AHN K H.Effects of internal recycling time mode and hydraulic retention time on biological nitrogen and phosphorus removal in a sequencing anoxic/anaerobic membrane bioreactor process[J].Bioprocess&Biosystems Engineering,2009,32(1):135-142.
[17]城镇污水处理厂污染物排放标准:GB 18918-2002[S].