铁盐与铝盐混凝去除EDTA土壤淋洗废液中砷、锑效果对比

袁明珠; 丁雷; 李爽; 李永连

doi:10.13205/j.hjgc.202204017

铁盐与铝盐混凝去除EDTA土壤淋洗废液中砷、锑效果对比

doi: 10.13205/j.hjgc.202204017

袁明珠¹,
丁雷^1, ,,
李爽¹,
李永连²

1. 华东理工大学资源与环境工程学院高浓度难生物降解有机废水处理技术国家工程实验室, 上海 200237;
2. 启迪水务(上海)有限公司, 上海 200072

基金项目:

国家重点研发计划(2018YFC1802704)

详细信息

作者简介:
袁明珠(1996-),男,硕士研究生,主要研究方向为污水处理及资源化。751891580@qq.com

通讯作者:
丁雷(1978-),男,博士,副教授,主要研究方向为污水处理及资源化、土壤修复。leiding@ecust.edu.cn

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出版历程
- 收稿日期: 2021-05-31
- 网络出版日期: 2022-07-06

COMPARATIVE STUDY ON REMOVAL OF ARSENIC AND ANTIMONY FROM SPENT EDTA SOIL WASHING SOLUTION BY IRON/ALUMINUM COAGULATION PROCESS

1. National Engineering Laboratory for Industrial Wastewater Treatment, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China;
2. Tus-Water Group Limited, Shanghai 200072, China

摘要

摘要: 实验以三氯化铁和三氯化铝作为混凝剂,对比研究了混凝去除EDTA土壤淋洗废液中砷、锑的效果,重点探讨了反应终点pH、EDTA浓度、Fe/Al投加量以及共存重金属离子对砷、锑去除效果的影响。结果表明:1)对于EDTA土壤淋洗废液中As(Ⅴ)、Sb(Ⅴ)的去除,铝盐比铁盐效果更优;2)EDTA的存在不仅降低了铁盐/铝盐混凝对As(Ⅴ)、Sb(Ⅴ)的吸附去除效果,同时抑制了砷酸铁、锑酸铁等物质的生成,削弱了铁盐对As(Ⅴ)、Sb(Ⅴ)的沉淀去除。EDTA导致铁盐混凝过程中生成粒径较大、表面活性较低的稳定结晶态絮体;3)当c(EDTA)=0.05 mol/L时,在pH=5、ρ(Al)=2000 mg/L的条件下,铝盐对EDTA土壤淋洗废液中As(Ⅴ)、Sb(Ⅴ)的去除率分别高达98.00%和93.09%;4)共存重金属离子通过与EDTA络合,增加了絮体Al(OH)₃的生成量,促进了As(Ⅴ)、Sb(Ⅴ)去除。由此表明,铝盐能够有效实现EDTA土壤淋洗废液中As(Ⅴ)、Sb(Ⅴ)的去除,对于推动基于EDTA的土壤淋洗技术的广泛应用具有重要意义。
- 土壤淋洗废液 /
- 砷、锑 /
- EDTA /
- 混凝 /
- 铁盐/铝盐
Abstract: In the experiment, the removal efficiencies of As(Ⅴ) and Sb(Ⅴ) by coagulation process were comparatively studied when ferric chloride (FeCl₃) and aluminum chloride (AlCl₃) were used as coagulant separately, while the effects of the reaction endpoint pH, EDTA concentration, Fe/Al dosage and the coexistence of heavy metals on removal of As(Ⅴ) and Sb(Ⅴ) from spent EDTA soil washing solution were mainly discussed. The results showed that: 1) aluminum salt was more effective than iron salt in the removal of As(Ⅴ) and Sb(Ⅴ) from spent EDTA washing solution by coagulation process; 2) the presence of EDTA not only reduced the removal of As(Ⅴ) and Sb(Ⅴ) by the adsorption of iron/aluminum flocs, but also inhibited the formation of iron arsenate, iron antimonite precipitates, in which the removal of As(Ⅴ) and Sb(Ⅴ) decreased simultaneously. Larger size and quantity of stable crystalline precipitate was formed during iron coagulation process with EDTA; 3) when c(EDTA)=0.05 mg/L, the removal efficiency of As(Ⅴ) and Sb(Ⅴ) in the spent EDTA washing solution by aluminum coagulation was up to 98.00% and 93.09%, respectively, with pH=5 and ρ(Al)=2000 mg/L; 4) the formation of Al(OH)₃ flocs was enhanced to promote the removal of As(Ⅴ) and Sb(Ⅴ) when the coexisting heavy metals complexed with EDTA. The effective removal of As(Ⅴ) and Sb(Ⅴ) from spent EDTA soil washing solution by iron/alumiaum coagulation will promote the development and application of EDTA-based soil washing technologies.
- spent soil washing solution /
- arsenic /
- antimony /
- EDTA /
- coagulation

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