文章摘要
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.
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
投稿时间:2023-11-24  
DOI:10.11654/jaes.2023-0996
中文关键词: 蚯蚓  稻壳炭  城市污泥堆肥  重金属形态
英文关键词: earthworm  rice husk charcoal  municipal sludge composting  heavy metal speciation
基金项目:国家重点研发计划项目(2020YFC1908601,2019YFC1803501);国家自然科学基金项目(51878004);安徽高校协同创新项目(GXXT-2020-075);安徽省重点研究与开发计划项目(202104a06020027);安徽省高校优秀人才重点支持计划项目(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);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);2022年度省级质量工程项目(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
作者单位
王兴明 安徽理工大学地球与环境学院, 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, 安徽 淮南 232001
皖江流域退化生态系统的恢复与重建省部共建协同创新中心, 安徽师范大学, 安徽 芜湖 241000
安徽开源园林绿化工程有限公司, 合肥 230031 
徐岚 安徽理工大学地球与环境学院, 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, 安徽 淮南 232001 
范廷玉 安徽理工大学地球与环境学院, 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, 安徽 淮南 232001
皖江流域退化生态系统的恢复与重建省部共建协同创新中心, 安徽师范大学, 安徽 芜湖 241000 
储昭霞 资源与环境生物技术安徽普通高校重点实验室, 淮南师范学院生物工程学院, 安徽 淮南 232038 
董众兵 安徽理工大学地球与环境学院, 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, 安徽 淮南 232001 
董鹏 昆明理工大学冶金与能源工程学院, 昆明 650031 
邓瑞来 安徽开源园林绿化工程有限公司, 合肥 230031 
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中文摘要:
      为探讨稻壳炭强化蚯蚓堆肥对污泥性质和重金属的影响,本研究以城市污泥为研究对象,添加不同比例稻壳炭对蚯蚓堆肥进行强化处理,探究不同生物炭剂量(污泥干质量的2%、4%、6%、8%)对城市污泥蚯蚓堆肥过程中重金属有效态以及赋存形态的影响。结果表明:堆肥过程中pH呈先上升后降低的趋势,电导率先降低后升高,有机质呈下降趋势;与对照组(不添加稻壳炭)相比,添加不同比例稻壳炭强化后的电导率、有机质分别降低 28.96%~47.46%、2.84%~18.87%;稻壳炭强化的污泥堆肥中养分增加,总氮、总磷和总钾在8%添加量时分别提高9.89%、24.39%和2.51%。当稻壳炭添加到蚯蚓堆肥后,重金属从易迁移转化形态向稳定态转化,在 8% 添加比例时,Cd、Cu、Ni 的残渣态占比较对照组分别提高 3.57、19.12、9.27 个百分点,有效态分别降低56.25%、34.22%、28.20%;添加4%稻壳炭使Pb由可交换态、碳酸盐结合态向稳定的有机结合态转化,且有效态降低27.69%。相关性分析发现稻壳炭强化蚯蚓堆肥,升高堆体pH降低了污泥中Cd、Cu、Ni、Pb有效态含量。研究表明,稻壳炭强化蚯蚓堆肥可显著提升城市污泥营养元素,改善理化性质,提高污泥中重金属钝化效率。
英文摘要:
      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.
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