Co-composting of green waste and food waste at low C/N ratio |
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| Authors: | Mathava Kumar Yan-Liang Ou Jih-Gaw Lin |
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| Institution: | 1. Department of Population Health and Reproduction, School of Veterinary Medicine, University of California Davis, California 95616, USA;2. Department of Biological and Agricultural Engineering, University of California Davis, California 95616, USA;1. Centre for Environmental Science and Engineering (CESE), Indian Institute of Technology (IIT) Bombay, Powai, Mumbai 400076, India;2. National Environmental Engineering Research Institute (NEERI), Nagpur 440020, India |
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| 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. |
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