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首页> 外文会议>2011 water quality technology conference amp; exposition: An Oasis of Ideas for a Changing Environment. >Pilot Study of Advanced Water Treatment Processes to Purify Secondary Effluent
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Pilot Study of Advanced Water Treatment Processes to Purify Secondary Effluent

机译：先进的水处理工艺净化次级废水的中试研究

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The Metropolitan Water District of Southern California (Metropolitan) entered a collaborativerneffort with the Sanitation Districts of Los Angeles County (Districts) to evaluate the feasibility ofrna regional indirect potable reuse program. This potential indirect potable reuse program wouldrnapply advanced water treatment (AWT) processes to purify secondary effluent produced at thernDistricts’ Joint Water Pollution Control Plant (JWPCP). This pilot study tested two separaternadvanced water treatment process trains. One process train consisted of ultrafiltration (UF),rnfollowed by reverse osmosis (RO) and advanced oxidation process (AOP) consisting of UVrnoxidation in combination with hydrogen peroxide (H_2O_2). This train was tested to producerntreated water for groundwater replenishment. The second process train consisted of a membranernbioreactor (MBR) followed by RO and AOP and was tested to produce water that can be used forrnsurface water reservoir augmentation.rnThe water quality results show that both treatment trains produced high quality recycled waterrnfor parameters relevant to groundwater replenishment and surface water reservoir augmentation,rnsuch as nitrogen, TOC, trace organic compounds including volatile organic compounds,rnpesticides, herbicides, pathogens indicators, and contaminants of emerging concern. UF-RO #1rntrain treated these compounds to levels either below the laboratory reporting limits or relevantrnregulatory limits; the only exceptions were N-nitrosodimethylamine (NDMA), 1,4-dioxane, andrnboron. NDMA and 1,4-dioxane can be removed by AOP to meet the Title 22 Draft GroundwaterrnRecharge Reuse Regulations. Boron levels in the RO permeate was slightly above the BasinrnPlan limit of 0.5 mg/L. Source control may be required to reduce the boron levels to meet thisrnlimit. Similar to UF-RO #1 treatment, the MBR-RO #2 system achieved a high degree ofrnrejection for all constituents tested except NDMA, 1,4-dioxane, and boron. While NDMA andrn1,4-dioxane can be removed by AOP, boron and low levels of nitrate nitrogen in the productrnwater need to be removed if the water was to be considered for surface water reservoirrnaugmentation.rnThis study also demonstrated differences between MBR and UF for treatment of RO feed water.rnThe MBR nitrified the secondary effluent, so nitrate was the dominant form of nitrogen;rnammonia was the dominant nitrogen form in the UF filtrate. Nitrification also reduced alkalinityrnand pH, so less sulfuric acid was required to reduce the pH of the RO influent to the target level.rnIn addition, the MBR was more effective in removing total organic carbon (TOC), NDMA,rnNDMA formation potential (NDMAFP), and biodegradable pharmaceuticals, personal carernproducts (PPCPs).
机译：南加州的都市水区（大都市）与洛杉矶县（区）的卫生区进行了合作，以评估区域性间接饮用水再利用计划的可行性。这项潜在的间接饮用水再利用计划将采用先进的水处理（AWT）工艺，以净化ThernDistricts联合水污染控制厂（JWPCP）产生的二次废水。这项先导研究测试了两个单独的先进水处理工艺流程。一种工艺流程包括超滤（UF），随后的反渗透（RO）和由UV氧化与过氧化氢（H_2O_2）组成的高级氧化工艺（AOP）。该火车经过了生产者处理过的水补充地下水的测试。第二个工艺流程由膜生物反应器（MBR）和RO和AOP组成，并进行了测试以生产可用于地表水库增加的水。水质结果表明，这两个处理流程均产生了与地下水补给相关的参数的高质量循环水。地表水储集层的增加，例如氮，TOC，痕量有机化合物，包括挥发性有机化合物，杀虫剂，除草剂，病原体指示剂和受到关注的污染物。 UF-RO＃1rntrain处理这些化合物的水平低于实验室报告的限值或相关的监管限值；唯一的例外是N-亚硝基二甲胺（NDMA），1,4-二恶烷和硼。 AOP可以去除NDMA和1,4-二恶烷，以达到《 Title 22地下水再利用再利用条例》的要求。反渗透渗透物中的硼含量略高于贝辛计划的限值0.5 mg / L。可能需要进行源控制以降低硼含量以满足这一极限。与UF-RO＃1处理相似，MBR-RO＃2系统对除NDMA，1,4-二恶烷和硼以外的所有测试成分均实现了高度排斥。虽然可以通过AOP去除NDMA和rn1,4-二恶烷，但是如果要考虑将水用于表层水的贮藏，则需要去除产品水中的硼和低水平的硝酸盐氮。这项研究还证明了MBR和UF在处理方面的差异。 MBR将次要废水硝化，因此硝酸盐是氮的主要形式，而氨是超滤滤液中的主要氮形式。硝化作用还降低了碱度和pH值，因此需要较少的硫酸将RO进水的pH值降低至目标水平。此外，MBR在去除总有机碳（TOC），NDMA，rnNDMA形成潜能（NDMAFP）方面更有效。以及可生物降解的药品，个人carernproducts（PPCP）。

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