Hea vy metal r emo v al fr om sludg e with organ ic chelat ors : Compar ativ e study of N, N-bis(c arbo xymeth y l) glutamic acid and citric acid

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AuteurSUANON, FIDELE
AuteurSUN, QIAN
AuteurDIMON, BIAOU FIDELE
AuteurMAMA, DAOUDA
AuteurYU, CHANG PING
Date d'ajout2026-06-02T16:06:57Z
Date de disponibilite2026-06-02T16:06:57Z
Date de publication2016
ResumeThe applicability and performance of a new generation of biodegradable chelator, N, N-Bis(carboxymethyl) glutamic acid (GLDA), for extracting heavy metals from sewage sludge was carried out and compared with citric acid (CA). Targeted metals included Cd, Co, Cu, Zn, Ni and Cr, and their contents in the raw sludge were 63.1, 73.4,1103.2, 2060.3, 483.9 and 604.1 mg kg  1 (dry sludge basis), respectively. Metals were divided into six fractions including water soluble, exchangeable, carbonates bound, FeeMn bound, organic matters bound and residual fraction via chemical fractionation. Washing results showed that in general GLDA exhibited better performance compared with CA, with removal efficiency of 83.9, 87.3,81.2,85.6,89.3and90.2%forCd,Co,Cu,Zn,NiandCr,respectivelyatequilibriumpH¼3.3.Residual metals were better stabilized in the GLAD-washed sludge than in the CA-washed sludge, and were mostly tightly bonded to the residual fraction. Furthermore, CA promoted phosphorus (P) release while GLDA had an opposite effect and tended to retain P within sludge, which could be beneficial for further application in agricultural use. Findings from this study suggested that GLDA could be a potential replacement for refractory and less environmentally-friendly chelators in the extraction of metals from sludge.
Autre identifiantBECDB-1412
URIhttps://dspace.uac.bj/handle/123456789/1560
Languefr
Fait partie deJournal of Environmental Management
SujetSludge
SujetHea
Sujetvy
Sujetmetals
SujetF
Sujetractionation
SujetBis(carbo
Sujetxymeth
Sujetyl)
Sujetglutamic
Sujetacid
SujetCitric
TitreHea vy metal r emo v al fr om sludg e with organ ic chelat ors : Compar ativ e study of N, N-bis(c arbo xymeth y l) glutamic acid and citric acid
TypeArticle

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