污水处理厂出水有机磷污染特征及强化去除

Pollution Characteristics and Enhanced Removal of Organic Phosphorus in Effluent from a Wastewater Treatment Plant

针对污水处理厂(wastewater treatment plant,WWTP)有机磷(organic phosphorus,OP)污染现状,采用多种方法表征出水OP污染特性,并开展强化去除研究.结果表明,TP、PO_4^(3-)-P、聚磷酸盐(Poly-P)和OP的出水平均浓度分别为:0. 62、0. 22、0. 03和0. 37 mg·L^(-1),OP占比达59. 7%.工艺全流程分析结果表明,PO_4^(3-)-P、Poly-P和OP在进、出水中的占比依次是54. 4%、6. 3%、39. 3%和16. 9%、14. 5%、68. 6%. OP和溶解性有机碳(dissolved organic carbon,DOC)存在正相关性,相关系数为0. 65;亲水性和疏水性OP的平均浓度分别是0. 12 mg·L^(-1)和0. 31 mg·L^(-1),疏水性OP的C/P比亲水性低,说明疏水性OP生物利用度(bioavailability,BA)更高,结果表明OP的BA约为20. 0%,OP以难生物利用组分为主.强化去除研究表明活性焦最佳投加量为20 g·L^(-1),去除率为32. 6%; O_3最佳投加量为30 mg·L^(-1),去除率高达79. 1%,高级氧化技术较物理吸附更适合作为深度处理方式.

Given the presence of organic phosphorus(OP) pollution in wastewater treatment plant(WWTP) effluents,contaminant properties and enhanced removal approaches were investigated.The experimental results showed that the respective levels of effluent total phosphorus(TP),PO43^--P,Poly-P,and OP were 0.62,0.22,0.03,and 0.37 mg·L-1,respectively,for which the ratio of OPreached up to 59.7%.Based on the flow analysis,the proportions of influent PO43^--P,Poly-P,and OP changed from 54.4%,6.3%,and 39.3%to 16.9%,14.5%,and 68.6%within the effluent.The OP content was positively correlated with the DOC content(R2=0.65),and the average contents of hydrophilic and hydrophobic OP were 0.12 mg·L^-1 and 0.31 mg·L^-1,respectively.C/P in hydrophobic OP was relatively lower than that in hydrophilic OP,which indicated that the bioavailability of hydrophobic OP was higher.However,the bioavailability of hydrophobic OP was only 20%,which implied that the effluent OP basically consisted of refractory components.A total of 32.6% of OP within the effluent was removed through bioadsorption reactions with activated coke,while the removal of OP was up to 79.1%when 30 mg·L^-1 of O3 was applied,which suggested that advanced oxidation was more beneficial for the enhancement of OP removal.