污水处理厂出水有机磷污染特征及强化去除

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.

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

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), PO₄^3--P, Poly-P, and OP were 0.62, 0.22, 0.03, and 0.37 mg·L^-1, respectively, for which the ratio of OP reached up to 59.7%. Based on the flow analysis, the proportions of influent PO₄^3--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.