碳基催化剂活化过硫酸盐降解煤化工高盐废水工艺及再生研究
Research on carbon-based catalyst activated persulfates for degradation of high salinity coal chemical wastewater and regeneration
徐颜军 1卓佐西 1高强生 1董莹 1李宇航 1刘春红1
作者信息
- 1. 浙江省白马湖实验室有限公司,浙江 杭州 310051;工业新水源技术浙江省工程研究中心,浙江 杭州 310012
- 折叠
摘要
采用碳基催化剂活化过硫酸盐的高级氧化技术处理煤化工高盐有机废水,考察碳基催化剂的吸附性能,研究了不同种类氧化剂、停留时间(HRT)、过一硫酸盐(PMS)投加量、进水pH和反应温度等工艺参数对有机物降解效果的影响.将失活后的碳基催化剂进行原位再生,考察不同工艺条件对再生后催化剂性能的影响.结果表明,碳基催化剂吸附能力较强;PMS相较于过二硫酸盐(PDS)对有机物去除率更高,停留时间越长、反应温度越高PMS催化氧化有机物去除率越高;TOC去除率随PMS投加量增加先上升后下降,最佳投加量为5 g/L,pH为酸性条件更有利于PMS催化氧化反应进行.微波辅助比热循环辅助的催化剂再生效果略强但损耗率高,热循环辅助再生效果和PMS 浓度、反应温度和循环流量呈正相关关系,循环时间为1.5h再生效果最佳,催化剂再生后催化性能提升 35%左右,且再生后循环稳定性较好.
Abstract
High salinity organic wastewater in the coal chemical industry has complex composition and is difficult to degrade.Advanced oxidation technology using carbon-based catalyst activated persulfates is used to treat with high salinity organic wastewater from the coal chemical industry,and the adsorption performance of carbon-based catalyst is researched.The influences of different types of oxidants,residence time(HRT),peroxymonosulfate(PMS)dosage,influent pH,and reaction temperature on the degradation efficiency of organic matters are studied.In addition,the deactivated carbon-based catalyst is regenerated in situ,and the effects of different process conditions on the properties of regenerated catalyst are evaluated.Results indicate that carbon-based catalyst has strong adsorption capacity;Compared to peroxydisulfate,PMS exhibits a higher removal rate for organic matters.The longer the residence time and the higher the reaction temperature,the higher the removal rate.With the increasing dosage of PMS,the removal rate of organic matters firstly increases and then decreases.The optimal dosage of PMS is 5 g·L-1.Acidic pH condition is more conducive to PMS catalytic oxidation reaction.Microwave assisted regeneration shows slightly stronger effect than thermal cycling assisted regeneration,but suffers a higher loss rate.The effect by thermal cycling assisted regeneration is positively correlated with PMS concentration,reaction temperature and circulation flow rate,and the regeneration effect is the best when the cycle time is 1.5 h.The performance of catalyst is improved by about 35%after regeneration,and the recycling stability is good.
关键词
高盐有机废水/碳基催化剂/过硫酸盐/高级氧化/再生Key words
high salinity organic wastewater/carbon-based catalyst/persulfate/advanced oxidation process/regeneration引用本文复制引用
基金项目
浙江省重点研发计划项目(2021C03170)
出版年
2024
NETL
NSTL
万方数据