Abstract
With the development of urbanization, kitchen waste and garden waste have become an important part of municipal solid waste (MSW), which is in urgent need of resource treatment. This study investigated the impacts of garden waste as auxiliary materials on maturity and odor emissions (NH3 and H2S) during kitchen waste composting. The result showed that the combined composting product of kitchen waste and garden waste achieved the maturity effect, and the co-composting effect was better than that of separate composting of kitchen waste. Meanwhile, compared with the separate composting treatment of kitchen waste, the co-composting treatment of kitchen waste and garden waste can effectively reduce the cumulative emissions of H2S by more than 85%, and effectively reduce the cumulative emissions of NH3 by more than 75%. This study provides a technical reference for the green fertilizer utilization of kitchen waste and garden waste.
Highlights
With the development of the economy, the continuous promotion of urbanization and the implementation of the new policy of waste classification, the resource treatment of municipal solid waste (MSW) had been widely carried out [1]
Kitchen waste (KW) and garden waste (GW) were the main MSW related to our life
First-tier cities, with a high degree of urbanization and high population density, result in large and concentrated production of kitchen waste (KW) and GW, which was in urgent need of resource treatment
Summary
With the development of the economy, the continuous promotion of urbanization and the implementation of the new policy of waste classification, the resource treatment of municipal solid waste (MSW) had been widely carried out [1]. The massive emission of NH3 and H2S during the composting process produced odor pollution, and reduced the nutrient content of the compost. Adding auxiliary materials to the compost can improve the porosity of the pile, which is conducive to ventilation and oxygen supply, thereby reducing the emission of odor. Studies have shown that adding auxiliary materials to compost can reduce odor emission to varying degrees [3,14]. Agricultural wastes such as straw and fungus chaff have been proven to have significant effects as auxiliary materials [15,16]. The feasibility of co-composting of GW and KW was verified by integrating the effects of pollution gas emission and product ripening in the composting process, in order to provide technical support for the green fertilizer utilization of kitchen waste
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