Efficiency of ozonation process with calcium peroxide in removing heavy metals (Pb, Cu, Zn, Ni, Cd) from aqueous solutions

被引:0
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作者
Zhila Honarmandrad
Neda Javid
Mohammad Malakootian
机构
[1] School of Public Health,Department of Environmental Health Engineering
[2] Sirjan School of Medical Sciences,Department of Environmental Health Engineering, Zarand School of Nursing
[3] Kerman University of Medical Sciences,Environmental Health Engineering Research Center
[4] Kerman University of Medical Sciences,Department of Environmental Health, School of Public Health
[5] Kerman University of Medical Sciences,undefined
来源
SN Applied Sciences | 2020年 / 2卷
关键词
Ozone; Heavy metals; Calcium peroxide; Aqueous solutions; Advanced oxidation;
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摘要
Heavy metal ions have deadly effects on all forms of life, and through the disposal of industrial wastewater, they enter water resources and, eventually, the food chain. Advanced oxidation processes can remove hazardous and non-degradable organic pollutants in aqueous solutions. Variables examined were initial concentrations of calcium peroxide and heavy metals, contact time, pH, and ozonation rate. Maximum removal rate of heavy metals by ozonation with calcium peroxide under optimal conditions (contact time = 90 min, pH = 3, heavy metal concentration = 25 mg/L, calcium peroxide concentration = 0.025 mg/L and ozonation rate = 1 g/min) in synthetic and real samples were respectively 89.8% and 64.6% for Pb, 92.1% and 73.9% for Cu, 90.4% and 69.7% for Ni, 86.9% and 59.1% for Cd, and 93.4% and 78.8% for Zn. Maximum COD removal rates in synthetic and real samples were 88.1% and 69.9%, respectively. Removal rates of heavy metals and COD under optimal conditions on wastewater from the Isfahan electroplating industry and steel company were determined. The use of the ozonation process with calcium peroxide can be recommended as a good, coefficient method for the removal of heavy metals in wastewater treatment.
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