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Pilot-Scale Evaluation of Advanced Treatment Processes for DBP Precursor Removal

机译：DBP前体去除高级处理工艺的中试评估

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摘要

In order to meet the Stage 1 and future Stage 2 Disinfectant and Disinfection By-ProductsrnRules, the Cobb County-Marietta Water Authority has completed an intensive pilot-scale evaluation of advanced treatment technologies for disinfection by-product (DBP)rnprecursor removal at the 72-million-gallons-per-day (mgd) Wyckoff water treatment plant (WTP). The authority had observed elevated DBP levels in the distribution system,rnand due to the fact that several consecutive systems purchase water from multiple sourcesrnand areas with extended hydraulic residence time, simple solutions such as decreasingrnchlorine dose or switching to chloramines were not options.rnThe study was conducted over a 12-month period by the authority and its consultant,rnCDM, utilizing a two-train pilot-scale treatment plant. One train was used to simulaternexisting rapid mixing, flocculation, sedimentation, and filtration treatment processes tornprovide a baseline comparison, while the second train was used to evaluate the effect ofrnadding various DBP precursor reduction technologies to the existing Wyckoff WTPrntreatment process train. Technologies evaluated in the study included pre-chlorinerndioxide in lieu of prechlorination, pre- and intermediate-ozone/biofiltration, magneticallyrnenhanced ion exchange (MIEX?), and post-filter nanofiltration. Results of the study indicated the ability of the Wyckoff plant to significantly lower DBP levels to meet Stage 1 requirements by switching to chlorine dioxide as a pre-oxidant in lieu of prechlorination. Ozone/biofiltration did not have an incremental difference in the results for DBP precursor removal compared to pre-chlorine dioxide. Both pretreatment with MIEX and post-filter nanofiltration provided significant reduction in DBP precursors, allowing these technologies to be considered for future implementation to meet Stage 2 DBP requirements.
机译：为了满足第1阶段和未来第2阶段的消毒剂和消毒副产物规则，科布县玛丽埃塔水务局已完成了对72级消毒副产物（DBP）去除前体的先进处理技术的深入试点评估。 -Wyckoff水处理厂（WTP）-每天百万加仑（mgd）。当局观察到分配系统中DBP含量升高，并且由于以下事实：连续几个系统从多个水源购买水，并且水力停留时间较长，因此不能选择简单的解决方案，例如降低氯的剂量或改用氯胺。当局及其顾问rnCDM在12个月的时间内使用两列中试规模的处理厂进行了测试。一列用于模拟现有的快速混合，絮凝，沉降和过滤处理过程，以提供基线比较，而第二列用于评估将各种DBP前驱体还原技术应用于现有Wyckoff WTPrn处理过程的效果。这项研究中评估的技术包括前二氧化氯代替前氯化，前臭氧和中臭氧/生物过滤，磁增强离子交换（MIEX？）和后过滤器纳滤。研究结果表明，Wyckoff工厂有能力通过改用二氧化氯作为预氧化剂代替预氯化来显着降低DBP含量，以满足第一阶段的要求。与二氧化氯前相比，臭氧/生物过滤的DBP前体去除结果没有增量差异。用MIEX预处理和后过滤器纳滤都显着减少了DBP前体，从而可以考虑将这些技术用于将来的实施，以满足第2阶段DBP的要求。

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