Using scrap zero valent iron to replace dissolved iron in the Fenton process for textile wastewater treatment: Optimization and assessment of toxicity and biodegradability

被引:50
|
作者
GilPavas, Edison [1 ]
Correa-Sanchez, Santiago [1 ]
Acosta, Diego A. [2 ]
机构
[1] Univ EAFIT, Dept Ingn Proc, GIPAB Grp Invest Proc Ambientales, Cr 49 7 Sur 50, Medellin, Colombia
[2] Univ EAFIT, Dept Ingn Proc, Grp Desarrollo & Diseno Proc, Carrera 49 7 Sur 50, Medellin, Colombia
关键词
Industrial textile wastewater; Advanced treatment; Scrap zerovalent iron (SZVI); H2O2; Optimization; Toxicity; COMPARATIVE DEGRADATION; ELECTROCHEMICAL FENTON; ELECTRO-FENTON; OXIDATION; COAGULATION; REMOVAL; DYE; ZVI; PH; ELECTROCOAGULATION;
D O I
10.1016/j.envpol.2019.06.104
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A Fenton like advanced oxidation process (AOP) employing scrap zerovalent iron (SZVI) and hydrogen peroxide (H2O2) was studied for industrial textile wastewater treatment from a textile manufacturing plant located at Medellin, Colombia (South America). The wastewater effluent studied contains a mixture of organic compounds resistant to conventional treatments. The effect of initial pH and SZVI concentration and H2O2 concentration were studied by a response surface methodology (RSM) Box-Behnken design of experiment (BBD). The combined SZVI/H2O2 process led to reductions of 95% color, 76% of chemical oxygen demand (COD) and 71% of total organic carbon (TOC) at optimal operating conditions of pH = 3, SZVI = 2000 mg/L and [H2O2] = 24.5 mM. Molecular weight distribution measurement (MWD), ultraviolet-visible (UV-Vis) spectroscopy, HPLC, biodegradability and toxicity were used to characterize the pollutants after the treatment process finding that the resulting effluent was polluted mostly by low molecular weight carboxylic acids. A remarkable biodegradability enhancement of the effluent was evidenced by a BOD5/COD ratio increase from 0.22 to 0.4; also, the SZVI/H2O2 process successfully reduced the toxicity from 60% to 20% of dead A. Salina crustaceans. (C) 2019 Elsevier Ltd. All rights reserved.
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页码:1709 / 1718
页数:10
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