柠檬酸辅助热水解强化污泥中磷的释放及其回收  

Phosphorus release from sludge enhanced by citric acid assisted thermal hydrolysis and its recovery

作　　者：姚嘉林 刘吉宝[2] 刘小燕 孙广垠 毛宇 钱卫 郁达伟[2] 魏源送 YAO Jialin;LIU Jibao;LIU Xiaoyan;SUN Guangyin;MAO Yu;QIAN Wei;YU Dawei;WEI Yuansong(School of Energy and Environmental Engineering,Hebei University of Engineering,Handan 056038,China;Laboratory of Water Pollution Control,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;Shandong Qinghui Environmental Consulting Co.,Ltd.,Qingdao 266100,China;State Power Investment Group Capital Holding Co.,Ltd.,Beijing 100033,China)

机构地区：[1]河北工程大学能源与环境工程学院,邯郸056038 [2]中国科学院生态环境研究中心,水污染控制实验室,北京100085 [3]山东清汇环境咨询有限公司,青岛266100 [4]国家电力投资集团资本控股有限公司,北京100033

出　　处：《环境工程学报》2025年第2期393-403,共11页Chinese Journal of Environmental Engineering

基　　金：国家重点研发计划项目(2022YFC3203102)。

摘　　要：为提高污泥磷释放效率,采用柠檬酸辅助热水解联合处理,以实现污泥中的磷高效释放并结晶回收。探究了柠檬酸辅助热水解处理污泥的最佳磷释放条件以及磷形态的转化和释放机制,然后采用热诱导沉淀法从上清液中回收FePO4。结果表明,当先热水解后投加柠檬酸处理时,污泥中磷的释放效果优于先投加柠檬酸后热水解处理,前者在热水解温度T=170℃、柠檬酸投加量m=0.2 g·g^(-1)DS时,上清液中STP和PO43-浓度最高可达1479.2和1307.2 mg·L^(-1),释放率分别为66.9%和59.1%。污泥中不同形态的磷在柠檬酸-热处理过程中均先转化为形态稳定的正磷酸盐,然后在柠檬酸作用下以Fe-P和Al-P为主的正磷酸盐得到大量释放。采用热诱导沉淀法从上清液中回收了纯度较高的FePO4,磷总体回收率为37.5%。该研究为污泥中磷的回收利用提供了新的方向。In order to improve the efficiency of phosphorus release from sludge,citric acid-assisted thermal hydrolysis co-treatment was used to achieve efficient phosphorus release from sludge and recovery by crystallisation.The optimal phosphorus release conditions and the transformation and release mechanism of phosphorus forms in sludge treated by citric acid-assisted thermal hydrolysis were investigated,and then FePO4 was recovered from the supernatant by thermally induced precipitation.The results showed that the phosphorus release from sludge was better than that from citric acid-assisted thermal hydrolysis when thermal hydrolysis was followed by citric acid treatment,and that STP and PO43-in the supernatant were more efficiently released and crystallised than when citric acid was added first and then thermal hydrolysed,which was achieved at the thermal hydrolysing temperature of T=170℃and the dosage of citric acid m=0.2 g·g^(-1)DS,the concentration of STP and PO43-in the supernatant was up to 1479.2 and 1307.2 mg·L^(-1),with the release rates of 66.9%and 59.1%,respectively.Different forms of phosphorus in the sludge were first converted to morphologically stable orthophosphates during citric acid-heat treatment,and then the orthophosphates,mainly Fe-P and Al-P,were released in large quantities under the action of citric acid.Higher purity FePO4 was recovered from the supernatant by thermally induced precipitation with an overall phosphorus recovery of 37.5%.This study provides a new direction for the recycling of phosphorus from sludge.

关 键 词：污泥热水解 柠檬酸 磷释放 磷形态 磷回收 

分 类 号：X703[环境科学与工程—环境工程]