Intensification of in-sewer treatment strategies for optimal wastewater quality management and nutrient control

污水收集系统的建造和运行主要是作为卫生和水利基础设施，即防止洪水泛滥和将废水移出城市，以便进行适当的处理。因此，管理的重点主要集中在水力性能和防止管道中颗粒沉淀/气味的发展上。目前对收集系统的研究从污水输送延伸到下水道中发生的生化反应，有可能减少硫化氢的产生，同时改变进水废水的化学成分，以实现新的处理目标，如更高的出水水质和降低污水处理厂的运行成本。因此，优化收集系统中发生的物理化学和生化过程将有助于实现废水水质(特别是在磷和氮浓度方面)和污泥产量的最佳管理和控制。考虑到不同地区可能遇到的特定地点条件的多样性，开发/验证工具，如先进的计算模型，以快速确定特定于工厂的最佳条件，并使用污水处理药剂“设计”理想的进水口是至关重要的。这项建议旨在测试新的化学物质作为污水处理策略，以及开发/验证先进的建模工具，旨在确定最佳操作策略，以强化和控制污水收集系统中发生的生化和物理化学过程。化学物质(过氧化氢、三氯化铁和硝酸盐)的类型、投加位置、投加率及其对主体和生物膜中生化反应的影响，重点是H_2S的控制、VFA的产生和营养物质(P和N)的去除。

Sewage collection systems have been built and operated mainly as sanitation and hydraulic infrastructure, i.e. to prevent flooding and to move wastewater out of cities in order to receive appropriate treatment. As such, the management focus has been mostly on hydraulic performance and the prevention of particle settling/odor development in pipes. Current research in collection systems extends beyond sewage conveyance into the biochemical reactions occurring in sewers with the possibility of reducing H2S production while simultaneously modifying the influent wastewater chemistry to reach new treatment goals, such as highereffluent quality and reduced operational costs of the wastewater treatment plant. Thus, the optimization of physico-chemical and bio-chemical processes occurring in a collection system will help in achieving optimal management and control of wastewater effluent quality (especially in terms of phosphorus and nitrogen concentrations) and sludge production. Given the diversity of site-specific conditions encounterable in various geographies, it is paramount to develop/validate tools such as advanced computational models to rapidly identify plant-specific optimum conditions and "design" an ideal influent using in-sewer treatment chemistries.This proposal aims to test new chemistries as in-sewer treatment strategies as well as developing/validating advanced modeling tools aimed to identify the optimal operational strategies to intensify and control the bio-chemical and physico-chemical processes occurring in the sewer collection system. The type of chemicals (hydrogen peroxide, ferric chloride, and nitrate), the dosing location, and the dosage rate as well as their effect on the biochemical reactions in the bulk and the biofilm with focus on H2S control, VFA production, and nutrient removal (P and N).