Investigation on Quality of Leachate from Municipal Solid Waste Landfill and Compost plant (Case Study: Mashhad city)

Subject Areas : environmental management

Alireza Shokooh ¹ , Edvin Safari ² , Hossein Hashemin ³

1 - M.Sc. Environmental Engineering, Amirkabir University
2 - Assistant Professor, Faculty of Environment, Tehran University
3 - Assistant Professor, Environmental Science Research Institute, Shahid Beheshti University

Received: 2008-08-20 Accepted : 2009-07-24 Published : 2014-02-20

Keywords: Landfill, waste age, compost, Leachate, Heavy Metals,

Abstract :

The leachate quality of Mashhad landfill and receiving and fermentation units of its composting plantwas studied. Samples were taken during spring and summer, 2006. BOD, COD, TDS, TSS, NO3-N¯,NH4-N+, PO43-, Cl¯, pH, as well 10heavy metals Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, and Zn analysisin the samples. Mean COD, NO3¯N¯, and NH4-N+ in landfill, receiving and fermentation units sampleswere obtained 17418, 50512, 91168 mg COD/l and 2.34, 25.40, 25.97 mg NO3-N¯/l, and 658.78,570.89, 633.89 mg NH4-N+/l, respectively. The quality of leachate samples compared with Leachateof Tehran landfill and landfills in USA, Germany, Spain, Taiwan, Hong Kong, and Kuwait. Theresults showed the leachate of Tehran and Mashhad landfills and the composting plant have moreorganic materials than the other countries. BOD5/COD that shows biodegradability of organic matterswas 0.44, 0.51, and 0.55 in the leachate of landfill, receiving and fermentation units, respectively. Itmeans biological treatment can be useful for all of them. Heavy metals concentrations were undernational effluent standard in the landfill leachate. But the concentration of Fe, Zn and Mn were abovethe standard in the leachate of receiving and fermentation units. The results showed that it is possibleto meet the national standard by using a combination of physical- chemical and biological treatmentmethods.

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