毒性物质苯酚对除磷系统污泥活性及性能的影响
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摘要
为了探究毒性物质苯酚对生物除磷系统污泥性质及性能的影响,建立序批式厌氧/好氧(A/O)序批式反应器,通过控制进水苯酚含量分析了苯酚对生物除磷系统活性污泥及除磷性能的影响。结果表明:低浓度苯酚对活性污泥及生物除磷性能影响不明显,而高浓度苯酚(50 mg/L)条件下COD去除率为77. 8%～79. 2%,出水ρ(PO_4~(3-)-P)为1. 27 mg/L,PO_4~(3-)-P去除率仅为79. 3%。此外,高浓度苯酚能够减少污泥中总悬浮固体(MLSS)和提高污泥体积指数(SVI),从而导致污泥膨胀。苯酚存在可抑制聚磷菌厌氧释磷和好氧吸磷,当苯酚含量为50 mg/L时,厌氧最大释磷量仅为41. 9 mg/L,远低于空白组。此外,苯酚在活性污泥系统中能被部分降解,并且好氧降解高于厌氧降解。苯酚存在能够抑制生物除磷相关关键酶的活性。
In order to explore the effect of phenol,a toxic substance,on the properties and performance of the sludge in the biological phosphorus removal system,sequencing batch anaerobic/aerobic( A/O) reactors were established to determine the effect of phenol on activated sludge and phosphorus removal by controlling the influent phenol content. The results showed that low concentration of phenol had no significant effect on the performance of activated sludge and biological phosphorus removal,while high concentration of phenol( 50 mg/L) resulted in COD removal efficiency of 77. 8% ～ 79. 2%. The concentration of PO_4~(3-)-P in effluent was 1. 27 mg/L,and the removal efficiency of PO_4~(3-)-P was only 79. 3%. In addition,high concentration of phenol could reduce total suspended solids( MLSS) and increase sludge volume index( SVI),resulting in sludge bulking. The presence of phenol inhibited anaerobic phosphorus release and aerobic phosphorus uptake of phosphorus accumulating organisms. When the phenol content was 50 mg/L,the maximum amount of anaerobic phosphorus release was only 41. 9 mg/L,much lower than that in the blank group. In addition,phenol could be partially degraded in the activated sludge system,and aerobic degradation was higher than anaerobic degradation. Phenol could inhibit the activity of key enzymes related to biological phosphorus removal.
In order to explore the effect of phenol,a toxic substance,on the properties and performance of the sludge in the biological phosphorus removal system,sequencing batch anaerobic/aerobic( A/O) reactors were established to determine the effect of phenol on activated sludge and phosphorus removal by controlling the influent phenol content. The results showed that low concentration of phenol had no significant effect on the performance of activated sludge and biological phosphorus removal,while high concentration of phenol( 50 mg/L) resulted in COD removal efficiency of 77. 8% ～ 79. 2%. The concentration of PO_4~(3-)-P in effluent was 1. 27 mg/L,and the removal efficiency of PO_4~(3-)-P was only 79. 3%. In addition,high concentration of phenol could reduce total suspended solids( MLSS) and increase sludge volume index( SVI),resulting in sludge bulking. The presence of phenol inhibited anaerobic phosphorus release and aerobic phosphorus uptake of phosphorus accumulating organisms. When the phenol content was 50 mg/L,the maximum amount of anaerobic phosphorus release was only 41. 9 mg/L,much lower than that in the blank group. In addition,phenol could be partially degraded in the activated sludge system,and aerobic degradation was higher than anaerobic degradation. Phenol could inhibit the activity of key enzymes related to biological phosphorus removal.
引文
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[10]贺强礼,刘文斌,杨海君,等.一株苯酚降解菌的筛选鉴定及响应面法优化其降解[J].环境科学学报,2016,36(1):112-123.
[11]马娟,王谨,俞小军,等.苯酚对EBPR系统除磷性能的抑制作用[J].环境科学,2018,37(8):1-10.
[2]徐美燕,赵庆祥,刘颖.苯酚对生物硝化过程的抑制[J].安全与环境学报,2005,5(1):43-46.
[3]任志群.纳米ZnO对污水生物脱氮除磷系统影响的研究[D].哈尔滨:哈尔滨工业大学,2013.
[4]唐朝春,吴庆庆,段先月,等.利用吸附法处理废水中磷酸盐的研究进展[J].长江科学院院报,2018,35(4):18-23.
[5]赵建伟,李小明,杨麒,等.游离亚硝酸对好氧/延长闲置序批式反应器除磷性能的影响[J].环境科学学报,2014,34(7):1661-1667.
[6] Ge H,Batstone D J,Keller J. Biological phosphorus removal from abattoir wastewater at very short sludge ages mediated by novel PAO clade Comamonadaceae[J]. Water Research,2015,69:173-182.
[7] Yi K,Wang D,Li X,et al. Effect of ciprofloxacin on biological nitrogen and phosphorus removal from wastewater[J]. Science of the Total Environment,2017,605:368-375.
[8] Chen H,Wang D,Li X,et al. Effect of dissolved oxygen on biological phosphorus removal induced by aerobic/extended-idle regime[J]. Biochemical Engineering Journal,2014,90:27-35.
[9] Mc Call I C,Betanzos A,Weber D A,et al. Effects of phenol on barrier function of a human intestinal epithelial cell line correlate with altered tight junction protein localization[J]. Toxicology and Applied Pharmacology,2009,241(1):61-70.
[10]贺强礼,刘文斌,杨海君,等.一株苯酚降解菌的筛选鉴定及响应面法优化其降解[J].环境科学学报,2016,36(1):112-123.
[11]马娟,王谨,俞小军,等.苯酚对EBPR系统除磷性能的抑制作用[J].环境科学,2018,37(8):1-10.