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: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=681868
• 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。虽然生物固体对土壤肥力有益，但 EOC 含量却受到污水处理过程的影响。生物固体处理如何影响 EOC 降解和迁移率的机制尚不完全清楚。我们之前已经表明，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 积累并可能转移到水中。了解生物固体处理如何驱动 EOC 在土壤中的相互作用是这个 5 年计划的关键短期目标，以便解决土壤健康风险的更广泛的长期目标。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？*** 产生生物固体的过程是否会影响 EOC 在处理后生物降解的速率？添加到土壤中？*** 驱动 EOC 降解或迁移的机制与土壤特性或生物固体特性有关吗？****** 将使用实验室和现场研究来检验生物固体处理的假设对 EOC-土壤相互作用有显着影响。首先，我们将研究单一来源的原污水污泥中的 EOC 浓度如何响应三种稳定技术：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。这些结果将与我们之前研究的两个污染物传输模型相关联。将开展一项实地研究，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。机理研究将加深对土壤生物固体处理中驱动 EOC 响应的基本过程的理解。实证实地研究将在管理农业景观快速变化的条件下将土壤中的这些动态联系起来。 ******拟议的工作是原创的，有能力在国内和国际上产生重大的直接影响。城市环境中废水固体浓度是加拿大和全球范围内迅速增长的问题。农业系统中生物固体的扩散每年会产生数百吨人为化学物质，而我们对其影响的全部范围了解有限。我已经建立了重要的现场和实验室基础设施，以支持研究陆地生物固体中的 EOC，但我不知道加拿大或国际上建立了许多类似的实验系统。这些研究将重点了解城市污水处理如何影响接受生物固体改良剂的土壤中的 EOC 动态。