交变电场-铁改性生物质强化城市污泥深度脱水  

Alternating electric field combined with iron-modified biomass to enhance the deep-dewatering of municipal sludge

作　　者：李亚林[1] 陈高昂 孙丽莉 王恩赐 宋雨晴 孙趁心 LI Ya-lin;CHEN Gao-ang;SUN Li-li;WANG En-ci;SONG Yu-qing;SUN Chen-xin(College of Environmental and Biological Engineering,Henan University of Engineering,Zhengzhou 451191,China)

机构地区：[1]河南工程学院环境与生物工程学院,河南郑州451191

出　　处：《中国环境科学》2022年第7期3140-3148,共9页China Environmental Science

基　　金：教育部中西部高等学校青年骨干教师国内访问学者项目(19042);河南省科技攻关项目(212102310064);河南省高等学校青年骨干教师培养计划项目(2019GGJS239)。

摘　　要：为了实现城市污泥的深度脱水,采用铁改性生物质作为骨架构建体联合交变电场电渗透技术处理污泥,以单因素实验为基础,探究了该联合技术对污泥脱水性能的影响,并通过表面响应法优化了污泥脱水的工艺参数.将玉米秸秆使用浓度为0.03g/mL的FeCl_(3)溶改性后与污泥混合,当采用不等占空比为4.33:1的交变电场,电压为17.22V/cm,改性生物质投加量为96.81mg/gDS,改性生物质含水率为61.91%,生物质粒径为1.05mm,阴阳极间距为2.10cm时,可以得到含水率为58.21%的脱水污泥,脱水能耗为0.0148kW·h/kg RW(脱除水分).脱水污泥的扫描电镜表征结果显示,铁改性生物质可以在污泥中起到良好的骨架支撑作用,有利于提高污泥的机械强度和可渗透性;热重分析显示,脱水后污泥的上、下层燃烧过程可划分为析出自由水和束缚水阶段,析出和燃烧挥发分阶段、分解无机盐阶段,添加铁改性生物质的脱水污泥有机质含量更高,燃烧得更快.To realize deep-dewatering of municipal sewage sludge,the combined alternating electric field(AEF)electroosmosis technology was developed with iron modified biomass as the skeleton for disposal of sludge.Based on a single-factor experiment,the effect of the combined technology on sludge dewatering behavior was studied.Moreover,technical parameters of sludge dewatering were optimized with the response surface method(RSM).After mixing the sludge with corn stalks modified by FeCl_(3)of 0.03g/mL,in the AEF of unequal duty cycle at 4.33:1,voltage at 17.22V/cm,modified biomass dosage at 96.81mg/g DS,modified biomass moisture at 61.91%,biomass particle size at 1.05mm,and anode-cathode distance at 2.10cm,the dewatered sludge with a moisture content of 58.21%could be obtained,and the dewatering energy consumption was 0.0148kW·h/kg RW(Removed water).According to scanning electron microscope(SEM)characterization of the dewatered sludge,iron modified biomass well supports the sludge as the skeleton,which was conducive to the mechanical strength and permeability of the sludge.According to thermogravimetric analysis(TGA),the upper and lower combustion process in the dewatered sludge could be divided into the stage of precipitation of free water and bond water,the stage of precipitation and combustion of volatile,and the stage of decomposition of inorganic salts.The dewatered sludge mixed with iron modified biomass showed higher organic content and faster combustion.

关 键 词：城市污泥 脱水 生物质 交变电场 干化 

分 类 号：X703[环境科学与工程—环境工程]