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

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含量受污水处理过程的影响。生物固体处理如何影响EOC降解和流动性的机制尚未完全了解。我们以前已经表明，在农业生态系统中的碱（石灰）稳定的生物固体的集约化管理导致显着的EOC积累和潜在的运输到水中。了解生物固体处理如何推动土壤中的EOC相互作用是这个5年计划的关键短期目标，以解决更广泛的长期目标，即土壤健康的风险。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在添加到土壤中后的生物降解速率？ 促使EOC降解或流动的机制是否与土壤的性质或生物固体的性质有关？ 实验室和实地研究将被用来测试的假设，生物固体处理有显着影响EOC土壤相互作用。首先，我们将研究如何EOC浓度在一个单一的来源原污水污泥响应三种稳定技术：堆肥，厌氧消化，石灰稳定。这些生物固体将用于受控环境土壤培养和土柱运输研究，以检查EOC的生物降解和流动性。这些结果将被链接到两个污染物传输模型，我们以前workedon.A现场研究将被建立，以评估如何EOCs从不同的生物固体处理在土壤中的变化的温度和湿度的条件下，以及与植物的反应。机理研究将发展的基本过程驱动EOC的反应，从生物固体处理修改土壤的理解。经验性的实地研究将这些动态的土壤管理农业景观的快速变化的条件下的背景。 拟议的工作是原创性的，有能力在国内和国际上产生重大的直接影响。城市环境中的废水固体浓度在加拿大和全球范围内迅速增长。生物固体在农业系统中的扩散有能力每年引入数百吨人为化学物质，我们对其影响的全面范围的了解有限。我已经建立了重要的现场和实验室基础设施，以支持研究EOC从土地应用生物固体，我不知道许多类似的实验系统建立在加拿大或国际上。这些研究将集中我们的城市污水处理如何影响EOC动态接受生物固体改良剂的土壤中的理解。

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.