Kulkarni Veerdhawal, Awad John, Medlock Adam, Monis Paul, Lau Melody, Drigo Barbara, van Leeuwen John
Natural and Built Environments Research Centre, School of Natural and Built Environments, University of South Australia, South Australia, 5095, Australia.
Public Works Department, Faculty of Engineering, Mansoura University, Egypt.
MethodsX. 2018 Jun 30;5:684-696. doi: 10.1016/j.mex.2018.06.015. eCollection 2018.
Drinking water distribution systems with long hydraulic retention times (HRTs) commonly encounter rapid microbiological-mediated monochloramine decay that results in microbial regrowth and nitrification with reduction in alkalinity. In this paper, we report the design and operation of a field-based pilot-scale distribution system (PDS) operated at flows that simulate long HRTs (∼10 days) to promote rapid microbiological monochloramine decay over long periods. The PDS is designed to enable the testing of chemical treatment for the control of nitrification and monochloramine decay. The PDS has two identical cylindrical polyethylene tanks (DS & DS), each of 1 m diameter and 1.8 m height (∼1 kL) holding 900 m of polyethylene (PE) tubing with sampling points every 300 m intervals. Microbial mediated decay (determined by the Fm test) of monochloramine occurred as treated (alum coagulated and flocculated) and chloraminated water passed through the DSs. In this manuscript we report: •An inexpensive, flexible and compact system that can be readily set-up at a full-scale water treatment plant, requiring minimal supervision for operation.•A 'draw & fill' system for achieving control on HRT's through the pipes.
水力停留时间（HRT）较长的饮用水分配系统通常会遇到微生物介导的一氯胺快速衰减，这会导致微生物再生长和硝化作用，并使碱度降低。在本文中，我们报告了一个基于现场的中试规模分配系统（PDS）的设计与运行情况，该系统以模拟长HRT（约10天）的流量运行，以促进一氯胺在长时间内快速发生微生物介导的衰减。PDS旨在能够对控制硝化作用和一氯胺衰减的化学处理方法进行测试。PDS有两个相同的圆柱形聚乙烯水箱（DS和DS），每个水箱直径1米，高1.8米（约1千升），装有900米的聚乙烯（PE）管，每隔300米设有采样点。当经过处理（明矾混凝和絮凝）并加氯胺的水通过DS时，发生了微生物介导的一氯胺衰减（通过Fm测试确定）。在本手稿中，我们报告：•一种价格低廉、灵活且紧凑的系统，可在大型水处理厂轻松搭建，运行时所需监督极少。•一种通过管道实现对HRT进行控制的“抽取与填充”系统。
