ABSTRACT

The City of White Rock acquired the water system from EPCOR in October 2015. The City of White Rock decided to build a water treatment plant to treat the City’s existing groundwater supplies to remove naturally occurring manganese and arsenic to ensure that an improved drinking water quality is supplied to City residents that meets the Canadian guidelines and esthetic objectives. The City’s water supply is from groundwater wells located within the City municipal boundaries drawing from the confined Sunnyside Aquifer. There are seven operating, drilled wells. The Water Treatment Plant was built at the Oxford Pumping Station area. Construction of the Design Build water treatment plant (WTP) started in March 2018. The plant started operation in March 2019. The WTP treatment design objectives are to deliver drinking water meeting the following operational targets; Mn <0.02 mg/L, As <0.002 mg/L (95% of time, 0.005 mg/L for 5% of operation). All other water quality parameters shall meet the objectives of the Guidelines for Canadian Drinking Water Quality (GCDWQ) without treatment. The initial water quality data showed a significant removal of arsenic and manganese. However, after a few weeks of operation, the WTP performance for arsenic and manganese started to decline. Regeneration of the filter media was discussed with the contractor and manufacturer and implemented. The sequential regeneration of the four adsorbers was conducted successfully over a two-week period. Following the regeneration, arsenic concentration in the treated water effluent from the four parallel adsorbers was well within the water treatment plant Design Objectives of <0.002 mg/L. The staff of the Water Department worked to optimize the operation and make the changes needed to improve the performance of the plant.

摘要

白石市于 2015 年 10 月从 EPCOR 收购了供水系统。白石市决定建造一座水处理厂来处理该市现有的地下水供应，以去除天然存在的锰和砷，以确保改善饮用水质量提供给符合加拿大准则和审美目标的城市居民。纽约市的供水来自位于城市市政边界内的地下水井，取自承压的 Sunnyside 含水层。有 7 口作业井。水处理厂建在牛津泵站地区。Design Build 水处理厂 (WTP) 的建设于 2018 年 3 月开始。该工厂于 2019 年 3 月开始运营。WTP 处理设计目标是提供符合以下运营目标的饮用水；Mn <0.02 mg/L，As <0.002 mg/L（95% 的时间，0.005 mg/L 用于 5% 的操作）。所有其他水质参数应符合加拿大饮用水质量准则 (GCDWQ) 的目标，无需处理。初始水质数据显示砷和锰被显着去除。然而，在运行几周后，砷和锰的支付意愿开始下降。与承包商和制造商讨论并实施了过滤介质的再生。四个吸附器的连续再生在两周内成功进行。重生之后，来自四个平行吸附器的处理水流出物中的砷浓度完全符合水处理厂的设计目标 <0.002 mg/L。水务部门的工作人员致力于优化操作并进行必要的更改以提高工厂的性能。