絮凝-O_(3)/MNBs耦合工艺高效处理垃圾渗滤液纳滤浓缩液  

Efficient treatment of nanofiltration concentrate of landfill leachate through the coupling process of flocculation-O_(3)/MNBs

作　　者：温朝荣 梁慧宇 赵晴[1] 陈奔 吕慧[2] 孙连鹏[2] 徐兴泉 赵欣 廖嘉俊 WEN Chaorong;LIANG Huiyu;ZHAO Qing;CHEN Ben;LYU Hui;SUN Lianpeng;XU Xingquan;ZHAO Xin;LIAO Jiajun(School of Civil Engineering,Guangzhou University,Guangzhou 510006,China;School of Environmental Science and Engineering,Sun Yat-sen University,Guangzhou 510275,China;Zhongshan Public Urban Drainage Co.Ltd.,Zhongshan 528400,China)

机构地区：[1]广州大学土木工程学院,广州510006 [2]中山大学环境科学与工程学院,广州510275 [3]中山公用城市排水有限公司,中山528400

出　　处：《环境工程学报》2024年第3期766-776,共11页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金项目(42077155);国家青年科学基金项目(52000187,52100111);2021年佛山市社会领域科技攻关专项(2120001008746)。

摘　　要：针对垃圾渗滤液纳滤浓缩液可生化性极低而无法进行生物处置的问题,本研究采用絮凝-臭氧微纳米气泡(O_(3)/micro-nanobubbles,O_(3)/MNBs)耦合工艺处理垃圾渗滤液纳滤浓缩液以期提高其可生化性。通过改变絮凝工艺的絮凝时间,聚合硫酸铁投加量,絮凝转速以及O_(3)/MNBs工艺的臭氧进气量,初始pH,温度等参数来探究絮凝-O_(3)/MNBs耦合工艺最佳工艺参数。结果表明,在絮凝时间为40 min,聚合硫酸铁投加量为10 g·L^(-1),絮凝转速为300 r·min^(-1)的最佳絮凝工艺参数下,垃圾渗滤液纳滤浓缩液的色度、腐殖质及COD去除率分别为79.8%、59.2%和73.3%,B/C从0.09增至0.22,生物毒性由92.4%(高毒)降至50.6%(重毒)。垃圾渗滤液纳滤浓缩液絮凝工艺的出水进一步采用O_(3)/MNBs工艺处理,在臭氧进气量为400 mL·min^(-1),初始pH=11,反应温度为30℃的最佳工艺参数下,絮凝出水的色度、腐殖质及COD去除率分别达到100.0%、80.8%和38.9%,B/C由0.22增至0.62,生物毒性由50.6%(重毒)降至20.3%(低毒)。结果表明,絮凝-O_(3)/MNBs耦合工艺是提升垃圾渗滤液纳滤浓缩液可生化性的有效方法。Aiming at the problem that nanofiltration concentrate of landfill leachate has the limited bioavailability for biological disposal.In this study,the flocculation-ozone/micro-nanobubbles(O_(3)/MNBs)coupling process was employed to treat nanofiltration concentrate of landfill leachate and improve its bioavailability.The optimal process parameters for the flocculation-O_(3)/MNBs coupling process were explored by adjusting the flocculation time,PFS dosage and flocculation rotation speed in the flocculation process,and O_(3)inlet volume,initial pH and temperature in the O_(3)/MNBs process.The result showed that at the optimal flocculation process parameters:flocculation time of 40 min,PFS dosage of 10 g·L^(-1)and flocculation rotation speed of 300 r·min^(-1),the colorimetry,humus and COD removal rate of nanofiltration concentrate of landfill leachate were 79.8%,59.2%and 73.3%,respectively,the B/C increased from 0.09 to 0.22,and the biotoxicity decreased from 92.4%(high toxicity)to 50.6%(heavy toxicity).The effluent of flocculation process treating nanofiltration concentrate of landfill leachate was further treated by O_(3)/MNBs process.At the optimal process parameters:O_(3)inlet volume of 400 mL·min^(-1),initial pH=11 and reaction temperature of 30°C,the removal rates of chromaticity,humus,and COD of flocculation effluent reached 100.0%,80.8%,and 38.9%,respectively,and the B/C increased from 0.22 to 0.62,and the biotoxicity was reduced from 50.6%(heavy toxicity)to 20.3%(low toxicity).The results indicated that the flocculation-O_(3)/MNBs coupling process is an effective method to enhance the bioavailability of nanofiltration concentrate of landfill leachate.

关 键 词：垃圾渗滤液纳滤浓缩液 絮凝 臭氧微纳米气泡 可生化性 

分 类 号：X703.1[环境科学与工程—环境工程]