Heavy metal removal from wastewater in fluidized bed reactor

An innovative process for removing heavy metals including Cu, Ni and Zn from industrial wastewater has been developed. The new technology was based on inducing the nucleated precipitation of heavy metals on the sand surface in a fluidized bed reactor. The results showed that pH had a great effect on...

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Bibliographic Details
Published in:Water research (Oxford) Vol. 33; no. 8; pp. 1918 - 1924
Main Authors: Zhou, Ping, Huang, Ju-Chang, Li, Alfred W.F, Wei, Shirly
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 01.06.1999
Elsevier Science
Subjects:
Applied sciences
discrete precipitation
drip-wise dosing
Exact sciences and technology
fluidized bed reactor
heavy metal removal
Industrial wastewaters
metal carbonate
metal hydroxide
nucleation precipitation
Pollution
precipitation composition
SEM
slug dosing
Wastewaters
Water treatment and pollution
heavy metal removal
fluidized bed reactor
metal carbonate
nucleation precipitation
metal hydroxide
slug dosing
SEM
drip-wise dosing
discrete precipitation
precipitation composition
Fluidized bed reactor
Chemical precipitation
Industrial waste water
Physicochemical purification
Waste water purification
Experimental study
Heavy metal
ISSN:0043-1354, 1879-2448
Online Access:Get full text
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Summary:An innovative process for removing heavy metals including Cu, Ni and Zn from industrial wastewater has been developed. The new technology was based on inducing the nucleated precipitation of heavy metals on the sand surface in a fluidized bed reactor. The results showed that pH had a great effect on heavy metal removal efficiency and the optimum pH was about 9.0 to 9.1. At this pH value, heavy metal removal efficiency could be achieved above 92 and 95% when influent heavy metal concentrations were 10 and 20 mg/l, respectively. When pH was greater than 8.7, above 92.4% of the precipitation was composed of metal hydroxide. Hydraulic retention time (HRT) had almost no effect on heavy metal removal efficiency when HRT was greater than 7.1 min. Scanning electron microscope (SEM) analysis indicated that carbonate injection with a drip-wise manner was more conducive than that with a slug dosing manner for precipitation to be coated on the sand surface.
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content type line 23
ISSN:0043-1354
1879-2448
DOI:10.1016/S0043-1354(98)00376-5