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Published on: December 25, 2015
Effect of enriched thermotolerant nitrifying bacteria inoculation on reducing nitrogen loss during sewage sludge
Yi Zhao1, Weiguang Li2, Li Chen1
1School of Environment, Harbin Institute of Technology, Harbin 150090, China.
Abstract:
In the study, enriched thermotolerant nitrifying bacteria (TNB) was acquired from compost samples by domesticated cultivation under high temperature, and was inoculated into sewage sludge composting. The effect of inoculation on physical-chemical parameters, nitrogen loss and bacterial population involved in nitrogen transformation were determined. The results revealed that inoculation with enriched TNB improved the compost quality in terms of temperature, pH, organic matter degradation, C/N ratio and germination index. Compared to the control treatment, inoculation also decreased 29.7% of ammonia emission and reduced nitrogen loss by converting more NH4+-N into NO3--N in composting. In addition, inoculation increased the population of nitrifying bacteria and was not capable of inhibiting the growth of indigenous ammonifying bacteria as well. The results suggested that inoculation with enriched TNB was a feasible way to reduce nitrogen loss and promote maturity in sewage sludge composting.
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