铁-钙-炭强化污泥深度脱水及污泥基生物炭制备  

Iron-calcium-biochar enhanced sludge deep dewatering andsludge-based biochar preparation

作　　者：矫洪铭 付亮 周盈盈 王叙溶 张蕾蕾[1,2] 高永琳 周丹丹 JIAO Hongming;FU Liang;ZHOU Yingying;WANG Xurong;ZHANG Leilei;Gao Yonglin;ZHOU Dandan(Engineering Research Center of Low-Carbon Treatment and Green Development of Polluted Water in Northeast China,Ministry of Education,Northeast Normal University,Changchun 130117,China;Jilin Engineering Lab for Water Pollution Control and Resources Recovery,School of Environment,Northeast Normal University,Changchun 130117,China;Guangdong Qingjing Shijia Environmental Technology Co.,Ltd.,Zhuhai 519085,China)

机构地区：[1]东北师范大学东北水污染低碳治理与绿色发展教育部工程研究中心,吉林长春130117 [2]东北师范大学环境学院吉林省水污染控制与资源化工程实验室,吉林长春130117 [3]广东清境世嘉环境技术有限公司,广东珠海519085

出　　处：《能源环境保护》2024年第1期101-108,共8页Energy Environmental Protection

基　　金：吉林省自然科学基金资助项目(YDZJ202201ZYTS482);国家级大学生创新创业训练计划资助项目(202310200087)。

摘　　要：污泥脱水是污泥处置及资源化的重要前提。在实际工程中,常规使用FeCl_(3)作为污泥调理剂时,对于某些剩余污泥的强化脱水效果较差,无法满足后续处置的含水率要求。本研究以脱水困难的剩余污泥为研究对象,探究了FeCl_(3)、CaO和生物炭协同强化污泥深度脱水效果及其资源化利用途径。研究发现,在FeCl_(3)调理污泥脱水的最佳条件下,引入CaO和生物炭可以进一步提高脱水效果。对于脱水困难的剩余污泥(单独FeCl_(3)调理,最佳脱水情况下泥饼含水率仍有60%~70%),当FeCl_(3)投加剂量为9%、CaO投加剂量为2%、稻壳生物炭投加剂量为2%,压滤时间为7 min时,机械脱水后泥饼含水率可降低至44.08%,满足后续处置的含水率要求,并且滤液pH接近中性,不会增加滤液处理负担。脱水后的泥饼中含有Fe、Ca元素,在400℃条件下制备高性能污泥基生物炭,具有较高的比表面积和孔容,表面富含含氧官能团,可以高效去除水中Cr^(6+),吸附量为26.51 mg/g。本研究建立了铁-钙-炭协同强化污泥深度脱水及其制备高性能污泥基生物炭的技术策略,为难脱水剩余污泥的处理和资源化利用提供了科学依据和技术参考。Sludge dewatering is a crucial step in sludge disposal and resource recovery.While FeCl_(3) is commonly used to enhance sludge dewatering,it is ineffective for some residual sludges,resulting in a high moisture content in the sludge cake that fails to meet subsequent disposal requirements.In this study,we explored the synergistic effect of FeCl_(3),CaO,and biochar on the difficult dewatering residual sludge and its resource utilization.Under the optimal sludge dewatering with FeCl_(3) addition,CaO and biochar supplements could further enhance dewatering efficiency.When FeCl_(3) addition alone was used for the difficult-to-dewater residual sludge,the moisture content in the sludge cake was still as high as 60%~70%under optimal conditions(FeCl_(3)9%).However,at this FeCl_(3) optimal conditions,CaO(2%)and rice husk biochar(2%)were added and then pressure filtrated for 7 minutes,the moisture content of the sludge cake could reduce to 44.08%,meeting the disposal requirements.Furthermore,the pH of the filtrate remained close to neutral,thus avoiding additional burden on the filtrate treatment process.The dehydrated sludge cake containing Fe and Ca elements were utilized to produce high-performance sludge-based biochar under 400℃.This biochar have large surface area and pore volume,and the surfaces rich in oxygen-containing functional groups.Notably,it showed remarkable efficiency in removing Cr 6+,with an impressive adsorption capacity of 26.51 mg/g.This study has developed a comprehensive technical strategy to enhance the deep dewatering of difficult dewatering residual sludge and prepare high-performance sludge biochar,providing a valuable scientific basis and technical reference for the treatment and resource utilization of difficult dewatering residual sludge.

关 键 词：污泥脱水 氯化铁 氧化钙 生物炭 响应曲面法 

分 类 号：X705[环境科学与工程—环境工程]