Investigating Activated Sludge Microbial Population Efficiency in Heavy Metals Removal from Compost Leachate
Mehrdad Farrokhi1, 2, Mohammad Naimi-Joubani2, Abdollah Dargahi3, Mohsen Poursadeghiyan1, Hamzeh Ali Jamali4
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1Research Center in Emergency and Disaster Health, University of Social Welfare and Rehabilitation Sciences,
Tehran, Iran
2Research Center of Health and Environment, Guilan University of Medical Sciences, Rasht, Iran
3Department of Environmental Health Engineering, School of Public Health, Kermanshah University
of Medical Sciences, Kermanshah, Iran
4Environmental Health Department, School of Health, Qazvin University of Medical Sciences,
Qazvin, Iran
Submission date: 2017-06-17
Final revision date: 2017-07-23
Acceptance date: 2017-07-23
Online publication date: 2018-01-15
Publication date: 2018-01-26
Pol. J. Environ. Stud. 2018;27(2):623–627
Solid waste production has increased in recent years. Many studies have shown that generated leachate from solid waste contains a high concentration of heavy metals. Their removal efficiency from leachate was investigated in aerobic suspended and attached growth systems in lab-scale within 72 hours of aeration. All of the materials used were analytical grade (Merck). Maximum efficiency of the attached growth system in removal of BOD5 and COD was, respectively, 80% and 78.28%. Maximum removal efficiency for both attached and suspended growth was related to lead, and minimum removal efficiency was related to vanadium for the attached growth, and cadmium for suspended growth. Heavy metals removal efficiencies in attached growth from max to min were lead, iron, manganese, cobalt, zinc, mercury, magnesium, copper, chromium, nickel, cadmium, and vanadium, respectively; and the removal efficiencies for suspended growth from max to min were lead, manganese, iron, zinc, copper, magnesium, cobalt, mercury, chromium, nickel, vanadium, and cadmium, respectively. Generally it can be concluded that both systems are suitable for young leachate treatment, but to satisfy environmental discharge standards post treatment will be necessary.