Influence of biosolid treatment on the presence and mobility of emerging organic contaminants in agricultural soils after land application

生物固体处理对土地施用后农业土壤中新兴有机污染物的存在和流动性的影响

• 批准号: RGPIN-2017-05993
• 负责人: Price, Gordon
• 金额: $ 1.97万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=662613
• 关键词: Influence; biosolid; treatment; presence; mobility

Land application of biosolids introduces Emerging Organic Contaminants (EOCs) into the soil. While biosolids have benefits to soil fertility, EOC content is affected by sewage treatment processes. The mechanisms for how biosolids treatment affects EOC degradation and mobility are not fully understood. We have previously shown that intensive management of an alkaline (lime) stabilized biosolid in agro-ecosystems leads to significant EOC accumulation and potential transport into water. Understanding how biosolid treatment drives EOC interactions in soil is the key short-term objective for this 5-year program in order to address the broader long-term objective of what the risks are for soil health. The questions driving the short-term objectives are:******• How does sewage sludge treatment impact the presence of EOCs in the final biosolid product?***• Does the process of generating biosolids affect the rate at which EOCs will biodegrade after adding to soil?***• Are the mechanisms driving EOC degradation or mobility related to the properties of soil or the properties of the biosolid?******Laboratory and field-based studies will be used to test the hypotheses that biosolid treatment has a significant impact on EOC-soil interactions. First, we will examine how EOC concentrations in a single source raw sewage sludge respond to three stabilization techniques: composting, anaerobic digestion, and lime stabilization. These biosolids will be used in controlled environment soil incubation and soil column transport studies to examine EOC biodegradation and mobility. These results will be linked to two contaminant transport models that we have previously worked on. A field study will be established to evaluate how EOCs from the different biosolid treatments respond in soils under conditions of variable temperature and moisture, as well as with plants. The mechanistic studies will develop an understanding of underlying processes driving the EOC responses from biosolid treatments amended to soils. The empirical field study will contextualize these dynamics in soils under the rapidly changing conditions of managed agricultural landscapes. ******The proposed work is original and has the capacity to have significant immediate impact nationally and internationally. Concentration of wastewater solids in urban environments is rapidly growing issue in Canada and globally. The dispersal of biosolids in agricultural systems has the capacity to introduce hundreds of tons annually of anthropogenic chemicals that we have limited understanding of the full scope of their impact. I have built significant field and laboratory infrastructure in support of studying EOCs from land applied biosolids and I not aware of many similar experimental systems established in Canada or internationally. These studies will focus our understanding of how municipal sewage treatment affects EOC dynamics in soils receiving biosolid amendments.

生物固体的土地应用将新兴有机污染物 (EOC) 引入土壤中，虽然生物固体对土壤肥力有好处，但 EOC 含量会受到污水处理过程的影响。我们尚未完全了解生物固体处理如何影响 EOC 降解和迁移。先前表明，在农业生态系统中对碱性（石灰）稳定的生物固体进行强化管理会导致大量的 EOC 积累和潜在的迁移到水中。了解生物固体处理如何驱动 EOC 在水中的相互作用。土壤是该五年计划的关键短期目标，旨在解决土壤健康风险的更广泛长期目标。推动短期目标的问题是：******•。污水污泥处理如何影响最终生物固体产品中 EOC 的存在？***• 生成生物固体的过程是否会影响 EOC 添加到土壤中后生物降解的速率？***• 驱动 EOC 降解的机制是与土壤或土壤性质有关的流动性生物固体的特性？********实验室和实地研究将用于检验生物固体处理对 EOC-土壤相互作用有显着影响的假设。首先，我们将研究单一来源原料中 EOC 的浓度。污水污泥对三种稳定技术有反应：堆肥、厌氧消化和石灰稳定，这些生物固体将用于受控环境土壤培育和土壤柱运输研究，以检查 EOC 生物降解和流动性。与我们之前研究的两个污染物迁移模型相关联，将建立一项现场研究，以评估不同生物固体处理中的 EOC 在不同温度和湿度条件下对土壤以及植物的反应。加深对土壤生物固体处理驱动 EOC 响应的理解。实证实地研究将在管理农业景观快速变化的条件下将这些动态置于土壤中。有能力立即采取重大行动城市环境中的废水固体浓度在加拿大和全球范围内都是一个日益严重的问题。农业系统中生物固体的扩散每年会产生数百吨的人为化学物质，而我们对这些化学物质的全面了解还很有限。我已经建立了重要的现场和实验室基础设施来支持研究陆地生物固体中的 EOC，并且我不知道在加拿大或国际上建立了许多类似的实验系统，这些研究将集中我们对城市污水处理如何影响 EOC 动态的理解。接受生物固体改良的土壤。