Co-composting of green waste and food waste at low C/N ratio

Mathava Kumar, Yan Liang Ou, Jih-Gaw Lin*

*Corresponding author for this work

Research output: Contribution to journalArticle

196 Scopus citations

Abstract

In this study, co-composting of food waste and green waste at low initial carbon to nitrogen (C/N) ratios was investigated using an in-vessel lab-scale composting reactor. The central composite design (CCD) and response surface method (RSM) were applied to obtain the optimal operating conditions over a range of preselected moisture contents (45-75%) and C/N ratios (13.9-19.6). The results indicate that the optimal moisture content for co-composting of food waste and green waste is 60%, and the substrate at a C/N ratio of 19.6 can be decomposed effectively to reduce 33% of total volatile solids (TVS) in 12 days. The TVS reduction can be modeled by using a second-order equation with a good fit. In addition, the compost passes the standard germination index of white radish seed indicating that it can be used as soil amendment.

Original languageEnglish
Pages (from-to)602-609
Number of pages8
JournalWaste Management
Volume30
Issue number4
DOIs
StatePublished - 1 Apr 2010

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