Department of Civil, Environmental and Mining Engineering, The University of Western Australia, 35 Stirling Hwy, M051, Crawley, WA, 6009, Australia; Cooperative Research Centre for Water Sensitive Cities, Level 1, 8 Scenic Boulevard (Building 74) Monash University, Clayton, VIC, 3800, Australia.
School of Agriculture and Environment, The University of Western Australia, 35 Stirling Hwy, M004, Crawley, WA, 6009, Australia; Cooperative Research Centre for Water Sensitive Cities, Level 1, 8 Scenic Boulevard (Building 74) Monash University, Clayton, VIC, 3800, Australia.
J Environ Manage. 2019 Jun 15;240:219-230. doi: 10.1016/j.jenvman.2019.03.120. Epub 2019 Apr 1.
Decreasing per capita water consumption in several OECD countries has led to a notable flow reduction into sewer systems. However, sewers still transport similar quantities of solids and pollutants, leading to increased wastewater concentration and, potentially, excess solids deposition. The shift towards decentralised water schemes in cities and widely reported changes in rainfall patterns cast additional uncertainty on future wastewater quality and flows into sewers. Excess solids deposition in sewers can cause increased environmental pollution risks at Combined Sewer Overflows from solids resuspension and reduced sewer hydraulic capacities. This review analyses the magnitude of excess solids deposition due to changing wastewater composition and evaluates current approaches to modelling sewer solids. Gaps in commonly used modelling approaches for deposited bed processes, specifically in bed consolidation and bed particle cohesion processes, and gross solids transport were identified and addressed to enable better solids risk prediction and management.
在几个经合组织国家，人均用水量的减少导致进入污水系统的流量显著减少。然而，污水仍然输送着相似数量的固体和污染物，导致废水浓度增加，并且可能会有过多的固体沉积。城市向分散式供水系统的转变以及广泛报道的降雨模式变化，给未来污水质量和进入污水系统的污水量带来了额外的不确定性。由于污水成分的变化，过多的固体在污水中沉积，可能会增加合流制污水溢流中固体再悬浮和污水水力容量降低所带来的环境污染风险。本综述分析了由于废水成分变化而导致的过量固体沉积的程度，并评估了当前用于模拟污水中固体的方法。确定并解决了在常用的沉积床处理模型方法中存在的差距，特别是在床固结和床颗粒内聚过程以及总固体传输方面的差距，以实现更好的固体风险预测和管理。
