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Volume 40 Issue 4
Apr.  2022
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2022  >  40(4): 121-126
YUAN Mingzhu, DING Lei, LI Shuang, LI Yonglian. COMPARATIVE STUDY ON REMOVAL OF ARSENIC AND ANTIMONY FROM SPENT EDTA SOIL WASHING SOLUTION BY IRON/ALUMINUM COAGULATION PROCESS[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(4): 121-126. doi: 10.13205/j.hjgc.202204017
Citation: YUAN Mingzhu, DING Lei, LI Shuang, LI Yonglian. COMPARATIVE STUDY ON REMOVAL OF ARSENIC AND ANTIMONY FROM SPENT EDTA SOIL WASHING SOLUTION BY IRON/ALUMINUM COAGULATION PROCESS[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(4): 121-126. doi: 10.13205/j.hjgc.202204017
shu

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

doi: 10.13205/j.hjgc.202204017

  • 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

  • Received Date: 2021-05-31
    Available Online: 2022-07-06
    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.
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