Effects Of Bamboo Charcoal On Nitrogen Conservation And Greenhouse Gas Emissions Reduction During Swine Manure Composting

Efficient treatment and reuse of waste from pig breeding industry are critical steps to achieve sustainable development in pig breeding industry. Aerobic composting is an effective way to realize the reduction, sanitization and recycling of swine manure. However, during composting process, there is considerable nitrogen loss and remarkable greenhouse gas emissions, which can influence the use value of compost product and lead to environmental pollution. To solve problems such as nitrogen loss and greenhouse gas emissions during composting of swine manure, this study uses bamboo charcoal (BC) as the additive during an aerobic windrow composting trial. In the study, the effects of BC on composting maturation and transformation of nitrogen as well as emission of greenhouse gases (GHG) and ammonia during swine manure composting process have been analyzed. Also, control mechanism of BC on greenhouse gas and ammonia emissions during swine manure composting has been preliminarily investigated. The main results in present study are listed below:(1) By using turning as a method to supply oxygen for windrow composting, the effects of BC on composting maturation during swine manure composting have been investigated. The addition of3%(w/w) BC into swine manure compost can lessen the period of maturation by17days and significantly improve the efficiency of swine manure composting.(2) By applying Elemental Analysis and Gas Chromatography-Mass Spectrometer, the effects of BC on nitrogen transformation during composting of swine manure have been studied. The addition of3%BC into swine manure compost can reduce NH3emission by6.1%, diminish nitrogen loss by10%compared with control and facilitate nitrogen conservation during composting.(3) By using a static chamber system, the effects of BC on GHG emissions during composting of swine manure have been explored. The addition of3%BC into swine manure compost can diminish GHG emission (CO2-equivalent) by 139.1g·m-2day and contribute to GHG emission control during the process of swine manure composting.