中药渣联合FeCl_(3)优化污泥脱水性能及碳排放特征研究  

Sludge dewatering performance and carbon emission characteristics by using traditional Chinese medicine residues and FeCl_(3)as conditioners

作　　者：李羽志 李爱民 黄凯文 宋联 许燕娟 王硕 李激 LI Yuzhi;LI Aimin;HUANG Kaiwen;SONG Lian;XU Yanjuan;WANG Shuo;LI Ji(Jiangsu Key Laboratory of Anaerobic Biotechnology,School of Environment and Civil Engineering,Jiangnan University,Wuxi 214122;Wuxi Guolian Environmental Science&Technology Co.Ltd.,Wuxi 214171;Jiangsu Wuxi Environmental Monitoring Center,Wuxi 214121;Jiangsu Collaborative Innovation Center of Water Treatment Technology&Material,Suzhou 215009)

机构地区：[1]江南大学环境与土木工程学院,江苏省厌氧生物技术重点实验室,无锡214122 [2]无锡国联环保科技股份有限公司,无锡214171 [3]江苏无锡环境监测中心,无锡214121 [4]江苏高校水处理技术与材料协同创新中心,苏州215009

出　　处：《环境科学学报》2023年第10期98-107,共10页Acta Scientiae Circumstantiae

基　　金：江苏省政策引导类计划(国际科技合作/港澳台科技合作)专项资金(No.BZ2021030);无锡市科技创新创业资金(No.M20211003);江苏省碳达峰碳中和科技创新专项资金(No.BE2022303)。

摘　　要：污泥的妥善处理处置是市政污水处理厂稳定运行的难点之一,也是市政污水处理厂为实现碳达峰碳中和的重要环节.本研究探索污泥深度脱水调理药剂组合,为市政污水处理厂降本增效、降低碳排放提供新思路.采用中药渣+三氯化铁的药剂组合对污泥进行调理,同时对污泥处理处置全生命周期进行碳排放核算.发现相比于常规的CaO+FeCl_(3),中药渣+FeCl_(3)的调理方式在提高污泥的脱水性能、减轻滤液处理难度和降低污泥处理处置过程的碳排放具有较大优势.污泥的脱水速率和水分去除率分别提升32%和5%.传统CaO主要通过破坏细胞释放内部结合水,将TB-EPS和LB-EPS转换成SMP-EPS,以及降低污泥絮体与环境电位差的方式实现污泥脱水性能的改善.而中药渣+FeCl_(3)组主要通过建立排水通道和压缩双电层提高污泥的脱水性能.中药渣+FeCl_(3)其对胞外聚合物和微生物细胞的破坏较小,污泥滤液中的污染物组分含量也更低.中药渣的碳排放因子远小于CaO的碳排放因子,采用中药渣+FeCl_(3)的调理方式其碳排放总量较CaO+FeCl_(3)碳排放低646.7 kg·t^(-1),深度脱水阶段碳排放减少458.2 kg·t^(-1),碳汇增加97.28 kg·t^(-1).Sludge disposal is one of the difficulties in the stable operation of wastewater treatment plants(WWTPs),and is also an important key of achieving“carbon emission peak,carbon neutrality”target.This study aims to develop new composite chemicals of Chinese herb residue and FeCl_(3) for deep sludge dewatering,paving the new way on the energy efficiency improvement and cost/carbon emission decrement of WWTPs.The evaluation of carbon emission was further carried out for the whole life cycle of sludge disposal.As a result,compared with common CaO+FeCl_(3) group,our Chinese herb residue+FeCl_(3) group exhibited three great advantages as followed:①improving the performance of sludge dewatering rate by 32%and ratio by 5%mainly based on the drainage channel formation and electric double layer compression(destroying cells to release internal bound water,transforming TB-EPS and LB-EPS into SMP-EPS,and reducing the zeta potential while using CaO);②lowering the treatment difficulty of filtrate with less pollutant concentration because of weaker damage on EPS and microbial cells;③reducing the carbon emission of sludge disposal process by 458.2 kg·t^(-1) to 646.7 kg·t^(-1) DS with a 97.28 kg·t^(-1) DS carbon sink increase due to a smaller carbon emission factor of Chinese herb residue.

关 键 词：深度脱水 碳排放 有机质碳排放因子 滤液水质 中药渣 脱水性能 

分 类 号：TU992.3[建筑科学—市政工程] X705[环境科学与工程—环境工程]