Comparing the effects of three in situ methods on nitrogen loss control, temperature dynamics and maturity during composting of agricultural wastes with a stage of temperatures over 70 °C
| Autor: | Yanming Li, Juntao Jia, Qing Chen, Qiuyue Guo, Ruixue Chang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
In situ
Environmental Engineering Peat Hot Temperature Nitrogen Struvite 0208 environmental biotechnology chemistry.chemical_element 02 engineering and technology 010501 environmental sciences Management Monitoring Policy and Law 01 natural sciences chemistry.chemical_compound Soil Nutrient Ammonia Vegetables Medical Waste Disposal Waste Management and Disposal 0105 earth and related environmental sciences Maturity (geology) business.industry Composting Agriculture General Medicine Pulp and paper industry 020801 environmental engineering Refuse Disposal chemistry Environmental science Aeration Cucumis sativus business |
| Zdroj: | Journal of environmental management. 230 |
| ISSN: | 1095-8630 |
| Popis: | The study investigated the effects of three in situ methods for controlling nitrogen loss and maturity with different mechanisms: struvite-based addition (K2HPO4 and MgO, MP), woody peat addition (WP) and intermittent aeration (IA), during composting of vegetable waste (cucumber vine) with temperature over 70 °C to inactivate potential viral pathogens. The experiment was conducted in a 200 L pilot-scale composting system, with which temperature and ammonia emission were recorded in real time, and solid samples were collected and analyzed during the process. The results indicated that the methods of MP and IA reduced the total nitrogen loss by 27.5% and 16.1%, respectively, without inhibitory effects on the temperature, nutrient availability and maturity. The WP method significantly decreased the nitrogen loss but could not maintain the thermophilic stage over 70 °C, because of its influence on the material physio-chemical characteristics caused by woody peat addition. In conclusion, all three methods could promote the maturity process, and 20 days should be adequate for vegetable waste composting with a good nutrient availability. Considering the two factors of reducing nitrogen loss and achieving high temperatures together, we recommended the struvite-based controlling method with the mechanism of chemisorption to reduce nitrogen loss during vegetable waste composting that requires temperatures over 70 °C. |
| Databáze: | OpenAIRE |
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