Sewage sludge composting: influence of initial mixtures on organic matter evolution and N availability in the final composts

Waste Management
J DoubletSabine Houot

Abstract

The influence of bulking agents on organic matter (OM) stability and nitrogen (N) availability in sewage sludge composts was investigated. The same sludge was composted on an industrial plant with different mixtures of bulking agents. The composting process included an active phase and a curing phase, both lasting 6 weeks, separated by the screening of composts. The OM evolution was characterised by carbon (C) and N mass balances in biochemical fractions. The OM stability and N potential availability of final composts were measured during soil incubations. During composting, the C and N losses reached more than 62% of the initial C and more than 45% of the initial N, respectively, due to C mineralisation or N volatilization and screening. The bulking materials mostly influenced OM evolution during the active phase. They contributed to the mitigation of N losses during the active phase where N immobilisation through active microbial activity was favoured by bulking agents increasing the C:N ratio of the initial mixtures. However, the influence of bulking agents on OM evolution was removed by the screening; this induced the homogenisation of compost characteristics and led to the production of sludge composts with similar organic...Continue Reading

References

Sep 10, 2004·Journal of Environmental Quality·Virginie ParnaudeauJérôme Pagès
Oct 31, 2006·Journal of Environmental Quality·Eric S GaleElizabeth A Myhre

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Citations

May 18, 2011·Environmental Science and Pollution Research International·Yuan ZhangPatricia Garnier
Dec 15, 2015·Journal of the Air & Waste Management Association·Selnur Uçaroğlu, Ufuk Alkan
May 21, 2015·Environmental Science and Pollution Research International·A F Tello-AndradeG Sánchez-Galván
Apr 29, 2015·Bioresource Technology·Chuandong WuYunbei Li
Sep 24, 2013·Bioresource Technology·Micaela A R SoaresRosa M Quinta-Ferreira
Sep 19, 2014·Environmental Science and Pollution Research International·Yuan ZhangQi Shi

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