Study on Conditions Optimization of Surplus Sludge and Nutrient Soil Co-Composting

Abstract:

In order to test the feasibility of co-composting for surplus sludge and garbage RD thermal decompositing nutrient soil, the mid-temperature composting experiments for the optimized conditions such as bacteria inoculating mode, initial moisture and pH were carried. The results showed that:(1) K-bacteria isolated from soil had a ability of decompositing insoluble mineral potassium to soluble forms at a rate of 9.20 μgK/200ml.h, and a decomposing ratio of 7.83% for potassium feldspar in liquid batch culturing. Moreover, after liquid enlargement culturing for 32h, the quantity of bacteria spores reached its climax, which ensured the high survival rate of K-bacteria. (2) The pre-compost inoculating mode (M₁) was superior to post-compost (5^th d M₂) based on available nutrient or K-bacteria quantity increasing;(3) Through optimizing experiments, the best initial moisture of 50-60% and pH of 6.5 were determined with an ideal available nutrients and K-bacteria quantity in compost; (4) The inoculating of K-bacteria could increase the microbial quantity and activity, which may increase the heavy metal activity in compost, so the further researches on heavy metal passivation should be considered.

• Periodical: Applied Mechanics and Materials (Volumes 522-524)
• Pages: 840-844
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.522-524.840
• Online since: February 2014
• Authors: Jia Liang Li*, Chang Qing Shan, Hui Zhang, Ji Bin Yang
• Keywords: Co-Composting, Inoculation, K-Bacteria, Nutrient Soil, Optimization, Surplus Sludge

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