Determining the Compost Maturity Time in Biosolids of Municipal Wastewater Treatment Plant

Alidadi, H and Najafpoor, A.A (2011) Determining the Compost Maturity Time in Biosolids of Municipal Wastewater Treatment Plant. Journal of Mazandaran University of Medical Sciences, 21 (85). pp. 85-90.

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Official URL: http://jmums.mazums.ac.ir/article-1-839-en.html

Abstract

Background and purpose: There is no specific standard on the compost maturity time of biosolids of wastewater treatment plants in �ran therefore, the researchers made an attempt to employ different chemical and biological methods to assess the compost maturity time. Materials and methods: �n this study, the sludge was obtained from the drying beds of South �sfahan Wastewater Treatment Plant and was then mixed with sawdust and windrow type of composting was performed to stabilize the sludge. The height, width and length of windrow were 1.2, 1.5, and 2.5 m, respectively. The windrow turning was done manually for 7-10 days. Results: The results showed that, �/N ratio after 100 days of composting reached 15.1 and the NH4/N�3 ratio decreased with increase in the time of dewatered sludge compost. The content of volatile solids decreased up to 28.8 percent with composting time and the number of fecal coliforms reached 898 MPN/gram of total solids. �onclusion: Thus, biosolids compost in this study was mature and ready for use as an agricultural substrate after 100 days of composting.

Item Type: Article
Uncontrolled Keywords: Maturity, stability, compost, biosolids, wastewater treatment plant
Depositing User: Unnamed user with email eprints@mazums.ac.ir
Date Deposited: 04 Jan 2018 16:54
Last Modified: 04 Jan 2018 16:54
URI: http://eprints.mazums.ac.ir/id/eprint/2509

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