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| The impact of adding phosphate tailings on compost quality and NH3 and H2S emissions |
| Received:January 09, 2025 |
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| KeyWord:phosphate tailings;aerobic composting;odor emissions;composting quality |
| Author Name | Affiliation | E-mail | | LAI Haiyu | School of Resources and Environment, Southwest University, Chongqing 400715, China
Key Laboratory of Southwest Organic Cycle Engineering Center, Ministry of Agriculture and Rural Affairs, Dali 671200, China | | | LÜ Tongrui | School of Resources and Environment, Southwest University, Chongqing 400715, China
Key Laboratory of Southwest Organic Cycle Engineering Center, Ministry of Agriculture and Rural Affairs, Dali 671200, China | | | ZHANG Dongli | School of Resources and Environment, Southwest University, Chongqing 400715, China
Key Laboratory of Southwest Organic Cycle Engineering Center, Ministry of Agriculture and Rural Affairs, Dali 671200, China | | | ZHANG Lanxia | School of Resources and Environment, China Agricultural University, Beijing 100193, China
Key Laboratory of Southwest Organic Cycle Engineering Center, Ministry of Agriculture and Rural Affairs, Dali 671200, China | | | LUO Wenhai | School of Resources and Environment, China Agricultural University, Beijing 100193, China
Key Laboratory of Southwest Organic Cycle Engineering Center, Ministry of Agriculture and Rural Affairs, Dali 671200, China | | | HOU Yong | School of Resources and Environment, China Agricultural University, Beijing 100193, China
Key Laboratory of Southwest Organic Cycle Engineering Center, Ministry of Agriculture and Rural Affairs, Dali 671200, China | | | ZHANG Wei | School of Resources and Environment, Southwest University, Chongqing 400715, China | | | ZHONG Shunhe | Key Laboratory of Southwest Organic Cycle Engineering Center, Ministry of Agriculture and Rural Affairs, Dali 671200, China
Yunnan Shunfeng Erhai Environmental Protection Technology, Dali 671000, China | | | WANG Chunrong | Key Laboratory of Southwest Organic Cycle Engineering Center, Ministry of Agriculture and Rural Affairs, Dali 671200, China
Yunnan Shunfeng Erhai Environmental Protection Technology, Dali 671000, China | | | LIU Fei | Key Laboratory of Southwest Organic Cycle Engineering Center, Ministry of Agriculture and Rural Affairs, Dali 671200, China
Yunnan Shunfeng Erhai Environmental Protection Technology, Dali 671000, China | | | ZHU Qichao | School of Resources and Environment, China Agricultural University, Beijing 100193, China | qichaozhu@126.com |
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| Abstract: |
| In order to optimize the aerobic composting process, accelerate the composting effect, and reduce odor emissions during the composting process, This study used a mixture of cow manure, tobacco dust, and sugarcane bagasse as substrates, and added 2.5%, 5%,7.5%, and 10% of the total dry weight of the substrate to phosphorus tailings as treatment groups, respectively. No phosphorus tailings were added as a control. The physical and chemical properties, nutrient content changes, and odor emission characteristics such as ammonia （NH3）and hydrogen sulfide（H2S）during the composting process were studied. The results showed that compared with the control treatment, the addition of phosphate tailings could reduce the bulk density of the compost by 3%-10%, reduce H2S emissions by 50%- 74%, decrease the comprehensive odor intensity by 2.8% - 74%, and reduce EC values by 1% - 8%. It significantly improved the germination index（GI）of compost seeds by 26%-34%, exchangeable calcium by 4%-60%, exchangeable magnesium by 8%-37%, but increased NH3 emissions by 2.8%-52.8%. Overall, the 7.5% addition has the best effect, reducing H2S emissions by 74%, decreasing odor intensity by 5.3%, increasing GI value by 32%, and meeting the organic fertilizer production standards for ammonium nitrogen（NH4+-N） and heavy metal content. Research has shown that the appropriate addition of phosphate tailings can effectively improve the structure of the heap, reduce H2S emissions, and decrease odor intensity, which helps to improve composting efficiency and quality, and achieve the harmless and resource utilization of industrial and agricultural solid waste phosphate tailings and cow manure. |
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