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Paper Details

Composting Of Sewage Sludge Based On Different C/N Ratios

Ashish Kumar Nayak and Ajay S. Kalamdhad*

Journal Title:Journal of Chemical, Biological and physical sciences
Abstract


Sewage sludge is an unavoidable by-product of wastewater treatment processes; its disposal is generally costly or easy to contaminate the environment. Being rich in micro-and macronutrients, composting of sewage sludge is one of the important disposal alternatives. Nutrients balance plays a vital role in the composting process which is expressed as, carbon to nitrogen (C/N) ratio. Therefore, the aim of this paper is to evaluate the feasibility of C/N ratios (15, 20, 25, and 30) with control on the agitated pile composting of sewage sludge during 30 days. It was observed that C/N 30 produced the best compost, showed highest temperature profile, higher loss in EC value, TOC, CO2 evolution, OUR, BOD, COD and higher gain in total nitrogen and phosphorus, implying the total amount of biodegradable organic material is stabilized; and a Solvita maturity index of 8 indicated that the compost was stable and ready for usage as a soil conditioner. On analyzing the results by ANOVA, the physico-chemical, biological and stability parameters varied significantly during the 30 days composting process. Therefore, it can be suggested that the pile composting of sewage sludge at C/N 30 can produce more stable compost after 30 days, while, C/N 15, 20, 25 and control poses least stable.

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