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| Impacts of material mixtures on humification and gaseous emission during cow manure composting |
| Received:October 16, 2024 |
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| KeyWord:Erhai Lake basin;cow manure;aerobic composting;odor emission;humification;tobacoo powder;bagasse |
| Author Name | Affiliation | E-mail | | Lü Tongrui | College of Resources and Environment, Southwest University, Chongqing 400715, China
Key Laboratory of Southwest Organic Recycling Engineering Center, Ministry of Agriculture and Rural Affairs, Dali 671200, China | | | ZHANG Lanxia | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
Key Laboratory of Southwest Organic Recycling Engineering Center, Ministry of Agriculture and Rural Affairs, Dali 671200, China | | | HOU Yong | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
Key Laboratory of Southwest Organic Recycling Engineering Center, Ministry of Agriculture and Rural Affairs, Dali 671200, China | | | XIAO Ran | College of Resources and Environment, Southwest University, Chongqing 400715, China | | | LIU Fei | Key Laboratory of Southwest Organic Recycling Engineering Center, Ministry of Agriculture and Rural Affairs, Dali 671200, China
Yunnan Shunfeng Erhai Lake Environmental Protection Technology Co., Ltd., Dali 671005, China | | | SUN Junwei | Dali Prefecture Branch of Yunnan Provincial Tobacco Company, Dali 671014, China | 278836098@qq.com | | LUO Wenhai | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
Key Laboratory of Southwest Organic Recycling Engineering Center, Ministry of Agriculture and Rural Affairs, Dali 671200, China | luowenhai@cau.edu.cn |
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| Abstract: |
| The cow manure production in the Erhai Lake basin is high, and aerobic composting represents an effective pathway for its resource utilization. In the Erhai Lake Basin, processing by-products such as tobacco powder（T）and bagasse（B）are commonly used as composting bulking agents for high-moisture materials like dairy cow manure. However, the synergistic effects of their combined use on odor emission control and humification during cow manure composting require further evaluation. This study conducted aerobic composting for 35 days using 80%（wet weight）cow manure as the main material, with additions of 20%T, 15%T+5%B, 10%T+10%B, 5%T+15%B, and 20%B, respectively. The results indicated that as the proportion of bagasse increased, the heating rate and peak temperature rose, but this was detrimental to maintaining high temperatures. Conversely, as the proportion of tobacco powder increased, the seed germination index（GI）and humus content decreased, while ammonia（NH3）and hydrogen sulfide（H2S）emissions increased, and the total nutrient content gradually rose. Compared to the treatments with 5%T+15%B and 20%B, the treatment with 10%T+10%B exhibited an increase in high-temperature duration by 3 and 4 days, respectively, and an increase in total nutrient content by 12.6% and 32.5%, respectively. Furthermore, compared to the treatments with 15%T+5%B and 20%T, the treatment with 10%T+10%B reduced NH3 emissions by 60.5% and 67.5%, respectively, and H2S emissions by 82.5% and 87.9%, respectively. Additionally, the treatment with 10%T+10%B achieved the highest seed germination index（GI）value of 132.8% and a humus-to-fulvate ratio of 0.9. Therefore, the combined proportion of 10% tobacco powder and 10% bagasse can promote odor reduction and enhance humification during aerobic composting of cow manure. |
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