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| Emission reduction of volatile organic compounds（VOCs） in composting using additives |
| Received:July 14, 2023 |
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| KeyWord:composting;volatile organic compounds（VOCs）;sulfur-containing organic volatile compounds;additives;zeolite |
| Author Name | Affiliation | E-mail | | LI Xinrong | Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | TIAN Zhuang | Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | YANG Jinfeng | Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | GUO Xuan | Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | DU Lianfeng | Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | WANG Yue | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | yuewang2008@126.com | | CHENG Weimin | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | |
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| Abstract: |
| In order to clarify the effect and influencing factors of additives on the reduction of volatile organic compounds（VOCs） emission from compost, adsorption additives（activated carbon and zeolite） and organic acid additives（citric acid and oxalic acid） were screened. In the composting experiment, five treatments were set up：control（CK）, activated carbon, zeolite, citric acid, and oxalic acid. The research objects included 115 VOCs, trimethylamine, and six sulfur-containing organic volatile gases（dimethyl sulfide, dimethyl disulfide, dimethyl trisulfide, methanethiol, ethyl mercaptan, and ethyl sulfide）. The emission reduction characteristics of VOCs and changes in physical and chemical parameters of four additives in the composting process were studied. The results showed that within 28 days of composting, all treatments reached 50 ℃, and this temperature was maintained for 7 days, meeting the harmless standard. 110 VOCs, trimethylamine, and 3 sulfur-containing organic volatile gases（dimethyl sulfide, dimethyl disulfide, and dimethyl trisulfide） were detected. The emission of VOCs was concentrated in the first 9 days, with an emission peak on the third day. The concentration of VOCs in the five treatments ranged from 169.22 mg·m-3to 548.26 mg·m-3. All four additives had emission reduction effects on various VOCs. On the third day, the emission reduction efficiencies of activated carbon, zeolite, citric acid, and oxalic acid for alkanes were 79%, 26%, 77%, and 46%, respectively; the emission reduction efficiencies for halogenated hydrocarbons were 96%, 38%, 93%, and 97%, respectively; the emission reduction efficiencies for aromatic hydrocarbons were 28%, 11%, 24%, and 53%, respectively. From the 6th day of composting, only zeolite had an emission reduction effect on various VOCs, and the highest emission reduction efficiency was 30%. For the reduction of sulfur-containing organic volatile gases, the order of reduction effect was oxalic acid > citric acid > zeolite > activated carbon. All four additives had an emission reduction effect on sulfur-containing volatile gas but had no effect on trimethylamine. Considering the emission reduction of VOCs in the first 9 days of composting, zeolite had the best emission reduction effect among the four additives. Zeolite in composting is beneficial for the synergistic emission reduction of VOCs and other gases and poses no risk to soil and crops; therefore, zeolite has broad application prospects in composting engineering. |
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