稻壳炭强化城市污泥蚯蚓堆肥过程中重金属变化特征
Characterization of heavy metal changes during rice husk charcoal-enhanced vermicomposting of municipal sludge
摘要
Abstract
The effects of rice husk charcoal-enhanced vermicomposting on sludge properties and heavy metals were investigated.Here,we took municipal sludge,added different proportions of rice husk charcoal to enhance vermicomposting and investigated the effects of different biochar dosages(2%,4%,6%,and 8%based on dry mass of sludge)on the bioavailability and speciation of heavy metals in the process of municipal sludge vermicomposting.During the composting process,pH first increased and then decreased,conductivity decreased and then increased,and organic matter decreased.After the addition of different ratios of rice husk charcoal reinforcement,the conductivity and organic matter decreased by 28.96%-47.46%and 2.84%-18.87%,respectively compared with the control group.The rice husk charcoal reinforcement caused a nutrient increase in the composted sludge,and the total nitrogen,total phosphorus,and total potassium increased by 9.89%,24.39%,and 2.51%at 8%addition,respectively.The addition of rice husk charcoal caused the compost heavy metals to continuously transform from easy to migrate to challenging to migrate.The proportion of Cd,Cu,and Ni residue states increased by 3.57,19.12,and 9.27 percentage points,respectively,and the bioavailability decreased by 56.25%,34.22%,and 28.20%,respectively,at 8%addition.In comparison,adding 4%rice husk charcoal could transform Pb from an exchangeable and carbonate-bound state to a more stable organic-bound state,and the bioavailability was reduced by 27.69%.Correlation analysis showed that rice husk charcoal-enriched vermicomposting reduced the bioavailability of most sludge heavy metals by increasing the compost pH.Therefore,rice husk charcoal-enriched vermicomposting can significantly enhance urban sludge nutrients,improve physicochemical properties,and increase passivation efficiency of sludge heavy metals.关键词
蚯蚓/稻壳炭/城市污泥堆肥/重金属形态Key words
earthworm/rice husk charcoal/municipal sludge composting/heavy metal speciation分类
农业科技引用本文复制引用
王兴明,徐岚,范廷玉,储昭霞,董众兵,董鹏,邓瑞来..稻壳炭强化城市污泥蚯蚓堆肥过程中重金属变化特征[J].农业环境科学学报,2024,43(7):1648-1656,9.基金项目
国家重点研发计划项目(2020YFC1908601,2019YFC1803501) （2020YFC1908601,2019YFC1803501）
国家自然科学基金项目(51878004) （51878004）
安徽高校协同创新项目(GXXT-2020-075) （GXXT-2020-075）
安徽省重点研究与开发计划项目(202104a06020027) （202104a06020027）
安徽省高校优秀人才重点支持计划项目(gxyqZD2021129) （gxyqZD2021129）
安徽省高潜水位矿区水土资源综合利用与生态保护工程实验室开放课题(2022-WSREPMA-04) （2022-WSREPMA-04）
2023年度省级新时代育人质量工程(研究生教育)(环境生态学教学案例库) （研究生教育）
2022年度省级质量工程项目(线下课程:水处理生物学) （线下课程:水处理生物学）
安徽开源园林绿化工程有限公司研发专项National Key Research and Development Program of China(2020YFC1908601,2019YFC1803501) （2020YFC1908601,2019YFC1803501）
National Natural Science Foundation of China(51878004) （51878004）
Anhui University Collaborative Innovation Project(GXXT-2020-075) （GXXT-2020-075）
Key Research and Development Program of Anhui Province(202104a06020027) （202104a06020027）
Anhui Province University Outstanding Talents Key Support Program(gxyqZD2021129) （gxyqZD2021129）
Opening Foundation of Anhui Province Engineering Laboratory of Water and Soil Resources Comprehensive Utilization and Ecological Protection in High Groundwater Mining Area(2022-WSREPMA-04) （2022-WSREPMA-04）
Provincial Quality Project for New Era Education(Graduate Education)(Teaching Casebook of Environmental Ecology) （Graduate Education）
Provincial Quality Project(Offline Course:Biology of Water Treatment) （Offline Course:Biology of Water Treatment）
Anhui Open Source Landscaping Engineering Co.,Ltd.Research and Development Special （）
