CHEN Liutong1， XIE Hongyong1， ZHANG Haitao2， LI Qiang3
(1. School of Materials and Environmental Engineering, Shanghai Second Polytechnic University, Shanghai 201209, China; 2. Shanghai Liming Resources Reuse Co., Ltd., Shanghai 201209, China; 3. Advanced Testing & Consulting Group, Shanghai 201209, China)
Abstract: According to the operation characteristics of the UASB system, an experimental simulator was set up and the water quality of the landfill leachate was monitored and analyzed in order to master the fluctuation of calcium ion content in leachate. The landfill leachate was treated with sodium phosphate as precipitant by distributed chemical precipitation method so as to precipitate calcium ions in the form of calcium-containing precipitates. After adding dilute sulfuric acid to adjust the pH value of landfill leachate, calcium-containing precipitates were formed again. These measures effectively degraded the scale objects from landfill leachate. The results show that the precipitate weight per ton of leachate reaches 6.7 kg after drying and the calcium removal rate reaches 53.6% under the experimental conditions are as follows: the content ratio of sodium phosphate added to the leachate is n(Ca)∶n(P)=2.5∶1, pH value of landfill leachate is adjusted to 6 by using sulfuric acid with its volume ratio of 25%, stirring rate is 300 r/min and static time is 12 h. These treatment measures not only slow down the scaling speed of the device so as to protect the anaerobic system but also save the operating cost.
Keywords: landfill leachate；fouling material；distributed chemical precipitation；sodium phosphate
中图分类号：X703.1
文献标志码：A
文章编号：1008-5548(2019)03-0013-06
DOI:10.13732/j.issn.1008-5548.2019.03.003
收稿日期： 2018-11-15，修回日期:2019-03-19，在线出版时间：2019-04-12 10:27。
基金项目：上海第二工业大学研究生项目，编号：EGD17YJ0016。
第一作者简介：陈流通(1992—)，男，硕士研究生，研究方向为环境监测。E-mail：1124546346@qq.com。
通信作者简介：谢洪勇(1961—)，男，博士，教授，硕士生导师，研究方向为纳米材料与环境工程。E-mail：hyxie@sspu.edu.cn。
