Heavy metal removal from wastewater in fluidized bed reactor

被引：117

作者：

Zhou, P ^{[1
]}

Huang, JC

Li, AWF

Wei, S

机构：

[1] Nanjing Univ, Dept Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, Nanjing 210093, Peoples R China

[2] Hong Kong Univ Sci & Technol, Dept Civil & Struct Engn, Hong Kong, Peoples R China

来源：

WATER RESEARCH | 1999年 / 33卷 / 08期

关键词：

heavy metal removal; fluidized bed reactor; discrete precipitation; nucleation precipitation; precipitation composition; slug dosing; drip-wise dosing; metal carbonate; metal hydroxide; SEM;

D O I：

10.1016/S0043-1354(98)00376-5

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：1918 / 1924

页数：7

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