给水厂污泥改良雨水生物滞留系统填料层最优设计深度研究  

RESEARCH ON OPTIMUM DESIGN DEPTH OF PACKING LAYER FOR WATER TREATMENT PLANT SLUDGE ENHANCED RAINWATER BIORETENTION SYSTEM

作　　者：仇付国[1] 李林彬 王娟丽[1] 付昆明[1] 曹秀芹[1] QIU Fu-guo;LI Lin-bin;WANG Juan-li;FU Kun-ming;CAO Xiu-qin(Key Laboratory of Urban Stormwater System and Water Environment (Beijing University of Civil Engineering and, Architecture),Ministry of Education,Beijing 100044,China)

机构地区：[1]北京建筑大学城市雨水系统与水环境教育部重点实验室,北京100044

出　　处：《环境工程》2018年第12期81-86,共6页Environmental Engineering

基　　金：国家自然科学基金(51278024);住房城乡建设部科学技术项目(K42016090);北京"未来城市设计高精尖中心"项目(2018);北京建筑大学市属高校基本科研业务费专项资金(X18182;X18214)

摘　　要：生物滞留系统的基质组成与填料层的深度对污染物去除有重要影响。利用给水厂污泥改良砂土作用生物滞留系统基质,研究了污染物在生物滞留系统内不同深度的去除情况,以确定改良填料层的最优设计深度。结果显示:进水ρ(SS)平均为198.14 mg/L,下渗通过20 cm改良基质后出水为15.96 mg/L,平均去除率高达92.34%;进水ρ(COD)平均为178.29 mg/L时,40与60 cm深度改良基质区间对溶解性COD的平均去除率分别为55.3%、78.7%;进水ρ(NH^+_4-N)平均为3.67 mg/L,经过40 cm改良基质后出水为0.12 mg/L;进水ρ(NO^-_3-N)与ρ(TN)平均分别为7.78,11.54 mg/L,通过15 cm种植土层和20,40,60 cm改良基质后,对NO^-_3-N平均去除率依次为5.0%、6.8%、15.1%、24.9%,对TN平均去除率分别为9.4%、16.6%、24.8%、32.8%;进水ρ(PO^(3-)_4-P)平均为5.31 mg/L时,经过40 cm改良基质后出水平均为0.09 mg/L。对实测雨水径流污染物浓度和形态进行分析表明,给水厂污泥改良砂土基质填料层深度为40 cm时,雨水生物滞留系统出水中各项污染物浓度均可满足GB 3838—2002《地表水环境质量标准》Ⅱ-Ⅲ类水质标准。The composition of substrate and depth of packing layer of the bioretention system have significant effect on pollutants removal. The study was carried out on the bioretention system with sand substrate enhanced with water treatment plant sludge to investigate the removal of pollutants by the bioretention system at different depths, so as to determine the optimum design depth of the modified packing layer. The results show that when the average concentration of SS in inflow was 198.14 mg/L, the average concentration of SS in effluent obtained after penetrating through enhanced substrate of 20 cm was 15.96 mg/L, with an average removal efficiency as high as 92.34%; when the average concentration of COD in inflow was 178.29 mg/L, the average removal efficiency of soluble COD after infiltrating through modified substrate layer of 40 cm and 60 cm were 55.3% and 78.7% respectively; when the average concentration of NH+4-N in inflow was 3.67 mg/L, the average concentration of NH+4-N in effluent obtained after infiltrating through the substrate layer of 40 cm was 0.12 mg/L;when the average concentrations of NO-3-N and TN in inflow were 7.78 mg/L and 11.54 mg/L respectively, after passing through a 15-cm planting soil layer and modified substrate layer of 20 cm, 40 cm, 60 cm, the average removal efficiencies of NO-3-N were 5.0%. 6.8%, 15.1%, 24.9%, and the average removal efficiencies of TN were 9.4%, 16.6%, 24.8%, 32.8%, respectively; when the average concentration of PO3-4-P in inflow was 5.31 mg/L, the average concentration of PO3-4-P in effluent obtained after passing the enhanced substrate layer of 40 cm was 0.09 mg/L. The analysis of measured concentrations and forms of pollutants in rainfall runoff show that when the depth of packing layer for sand substrate modified with water treatment plant sludge was 40 cm, the concentrations of various pollutants in effluent of the rainwater bioretention system can meet the class II and III water quality standards of the Environmental Quality Standard for Surface Water（GB 3

关 键 词：生物滞留系统 给水厂污泥 氮 磷 改良基质 

分 类 号：TU985.12[建筑科学—城市规划与设计] X52[环境科学与工程—环境工程]