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Chemical precipitation of heavy metals from wastewater by using the synthetical magnesium hydroxy carbonate

Water science and technology, 2020-03, Vol.81 (6), p.1130-1136 [Peer Reviewed Journal]

Copyright IWA Publishing Mar 2020 ;ISSN: 0273-1223 ;EISSN: 1996-9732 ;DOI: 10.2166/wst.2020.208 ;PMID: 32597400

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Title:
Chemical precipitation of heavy metals from wastewater by using the synthetical magnesium hydroxy carbonate
Author: Zhang, Yue ; Duan, Xiumei
Subjects: Adsorption ; Carbonates ; Chemical Precipitation ; China ; Chloride ; Efficiency ; Environmental impact ; Ferric oxide ; Heavy metals ; Iron ; Magnesite ; Magnesium ; Magnesium carbonate ; Metal industry ; Metal industry wastewaters ; Metallurgy ; Metals ; Metals, Heavy ; Methods ; Particle size ; Photocatalysis ; Pollution ; Precipitation ; Raw materials ; Recycled materials ; Removal ; Trivalent chromium ; Vanadium oxides ; Vanadium pentoxide ; Waste Water ; Wastewater
Is Part Of: Water science and technology, 2020-03, Vol.81 (6), p.1130-1136
Description: Heavy metal pollution has become one of the most serious environmental problems today. The preparation of magnesium hydroxy carbonate from low-grade magnesite, and the chemical precipitation of heavy metal wastewater with magnesium hydroxy carbonate as precipitating agent were undertaken. The removal efficiencies of heavy metals were improved by increasing the dose of magnesium hydroxy carbonate, and the applicable dose of magnesium hydroxy carbonate was 0.30 g for 50 mL of the wastewater (6,000 mg/L). The precipitation reactions proceeded thoroughly within 20 min. At this time, the removal efficiencies of heavy metals were above 99.9%. The final pH value was 7.1, the residual VO , Cr and Fe concentrations were 0.01, 0.05 and 1.12 mg/L, respectively, which conformed to the limit of discharge set by China (0.5-2.0 mg/L, GB 8978-1996). The precipitate was mainly composed of Fe O , V O and Cr O , which can be recycled as secondary raw material for metallurgical industry. The treatment of the heavy metal wastewater with magnesium hydroxy carbonate was successful in decreasing the concentrations of VO , Cr and Fe in wastewater.
Publisher: England: IWA Publishing
Language: English
Identifier: ISSN: 0273-1223
EISSN: 1996-9732
DOI: 10.2166/wst.2020.208
PMID: 32597400
Source: MEDLINE
ProQuest Central

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Chemical precipitation of heavy metals from wastewater by using the synthetical magnesium hydroxy carbonate

Copyright IWA Publishing Mar 2020 ;ISSN: 0273-1223 ;EISSN: 1996-9732 ;DOI: 10.2166/wst.2020.208 ;PMID: 32597400

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