Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 185, Issue 2-3, Pages 990-995Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2010.10.003
Keywords
In situ formed; Fe-Mn binary oxide; Poly-aluminum chloride; High-arsenic wastewater
Categories
Funding
- National High Technology Research and Development Program of China [2009AA062905, 2007AA06Z338]
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In this study, in situ formed Fe-Mn binary oxide (FMBO) was applied to treat a practical high-arsenic wastewater (5.81 mg/L). FMBO exhibited a remarkable removal capacity towards both As(III) and As(V), achieving a removal efficiency over 99.5%. However, the FMBO-As particles could not be sufficiently separated by gravitational sedimentation due to their low sizes and negative charges, as being indicated from laser particle size and zeta-potential analysis. Thus, poly-aluminum chloride (PACI) was introduced as a coagulant to facilitate the solid-liquid separation, and it remarkably improved As removal efficiencies. Results of scanning electron microscope (SEM) revealed that PACI contributed to the formation of precipitates with larger sizes and compact surfaces, which was favorable to sedimentation. Moreover, residual soluble As was removed by PACI hydroxides. The optimum dosages of FMBO and PACI were determined to be 60 mg/L and 80 mg/L, respectively. Additionally, the secondary pollution was minimized in FMBO-PACI process. Based on these bench-scale results, a full-scale treatment process was proposed to successfully treat 40,000 m(3) of high-arsenic wastewater in a municipal wastewater treatment plant (MWWTP). The average As concentration in the effluent was about 0.015 mg/L FMBO-PACI process showed the advantages of high effectiveness, low cost, safety, and ease for operation. (C) 2010 Elsevier B.V. All rights reserved.
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