环境工程学报2025，Vol.19Issue(2)：393-403,11.DOI:10.12030/j.cjee.202410017
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
摘要
Abstract
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 1 479.2 and 1 307.2 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Key words
thermal hydrolysis of sludge/citric acid/phosphorus release/phosphorus morphology/phosphorus recovery分类
资源环境引用本文复制引用
姚嘉林,刘吉宝,刘小燕,孙广垠,毛宇,钱卫,郁达伟,魏源送..柠檬酸辅助热水解强化污泥中磷的释放及其回收[J].环境工程学报,2025,19(2):393-403,11.基金项目
国家重点研发计划项目(2022YFC3203102) （2022YFC3203102）
