过硫酸钠对土壤中苯并(a)芘氧化修复条件的初步试验研究  

Preliminary experimental study on oxidative remediation of benzo(a)pyrene in soil by sodium persulfate

作　　者：刘中良 洪小峰 舒代容 Liu Zhongliang;Hong Xiaofeng;Shu Dairong(Guangdong Zhongke Bicheng Environmental Technology Co.Ltd.,Guangzhou Guangdong 510399,China)

机构地区：[1]广东中科碧城环境技术有限公司,广东广州510399

出　　处：《环境与发展》2020年第12期114-115,117,共3页Environment & Development

摘　　要：该试验采用四种活化方式的过硫酸钠对某项目地块苯并(a)芘污染土壤进行化学氧化修复。根据试验结果,除矿物活化之外,其他活化方式对苯并(a)芘的降解效果明显,生石灰活化降解效率最高,螯合铁活化降解更具有持久性;常规碱活化、生石灰活化对土壤pH影响较小,矿物活化、螯合铁活化会使原土酸化、土壤pH大幅下降;反应第3d各组苯并(a)芘的降解率均达到最大值,反应7d内各组过硫酸钠基本消耗完全;因此,该场地氧化修复推荐使用常规碱活化、生石灰活化和螯合铁活化,氧化降解最佳养护时间为3d,最多不超过7d。In this experiment,four activated methods of sodium persulfate were used for chemical oxidation remediation of benzo(a)pyrene contaminated soil in a project plot.According to the experimental results,except mineral activation,the degradation effect of other activation methods on benzo(a)pyrene was obvious,the activated degradation efficiency of quicklime was the highest,and the activated degradation of chelated iron was more durable.Conventional alkali activation and quicklime activation had little effect on soil pH,while mineral activation and chelated iron activation could acidify the original soil and greatly decrease the soil pH.The degradation rate of benzo(a)pyrene in each group reached the maximum on the third day of the reaction,and sodium persulfate in each group was almost completely consumed within 7 days of the reaction.Therefore,conventional alkali activation,quicklime activation and chelating iron activation are recommended for the site’s oxidation restoration.The optimal curing time for oxidative degradation is 3 days,with a maximum of 7 days.

关 键 词：过硫酸钠 氧化修复 活化方式 降解率 

分 类 号：X83[环境科学与工程—环境工程]