Identification and Remediation of Precipitation-related Clogging in Wastewater Effluent Filter-beds

在这个研究项目中，我们将调查目前在狄龙咨询管理的各种项目现场的污水地下过滤系统中遇到的堵塞问题。Dillon咨询有限公司试图了解堵塞问题的原因并提供潜在的补救措施。沉淀剂将被收集并分析铁、钙、硫、碳酸盐、镁、磷、氮、有机碳、蛋白质、钾和钠，以确定堵塞剂的组成。对降水问题上游发生的物理和化学条件进行分析，以确定离子浓度、水流速率、温度和pH值对降水的综合影响。将决定工艺设计的改变和流动配置，以减轻沉淀的形成和积聚。特别令人感兴趣的是在低离子浓度条件下的沉淀，以及可以做出哪些改变来避免这些问题。将评估不同孔隙率和特性的过滤介质的测试柱（例如，砂和interinterrecycled玻璃作为对照），以确定最佳渗透速率，以避免堵塞。通过另一个研究项目，我们在MB的Dunnottar村获得了一个场地，用于中试规模的沉淀形成条件和补救方案测试。Dillon Consulting将从这项研究中受益，因为他们将更好地了解与无机沉淀相关的运营挑战，并考虑对现有和未来站点进行设计更改。

In this research project, we will survey clogging problems currently experienced in wastewater sub-surfacefiltration systems at a variety of project sites managed by Dillon Consulting. Dillon Consulting Ltd. approachedus to understand the causes and provide potential remedies to such clogging issues. Precipitants will becollected and analyzed for iron, calcium, sulfur, carbonate, magnesium, phosphorus, nitrogen, organic carbon,protein, potassium, and sodium to determine the composition of the clogging agents. Analysis of physical andchemical conditions occurring upstream of the precipitation problems will be conducted to determine combinedeffects of ion concentration, water flow rate, temperature and pH on precipitation. Process design alterationsand flow configurations to mitigate precipitate formation and accumulation will be determined. Of particularinterest is precipitation occurrence in conditions of low ion concentration and what changes can be made toavoid these problems. Test columns of filter media of different porosity and character (e.g. sand and inertrecycled glass as control) will be evaluated to determine optimum percolation rates to avoid clogging. Throughanother research project, a site is available to us in the Village of Dunnottar, MB for pilot scale testing ofprecipitate forming conditions as well as remediation options. Dillon Consulting will benefit from this study, asthey will better understand operational challenges associated with inorganic precipitation and consider designchanges to existing and future sites.