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BALANCING NUTRIENTS IN A REUSE WORLD

机译：平衡重复使用世界的营养素

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The Western Corridor Recycled Water Project (WCRWP) in Queensland will reclaim water from municipal effluent for reuse to reduce demand by industrial users of current sources and possibly also to replenish source water. A total of three AWTPs will be constructed to treat secondary effluent from six wastewater treatment plants to provide an ultimate reuse water supply of 310 MLD. The first project, Bundamba-A, went into service in September 2007 with an initial capacity of 20 MLD. The second phase, Bundamba-B will go into service in mid 2008 to provide an additional 40 MLD. The liquid stream process will consist of microfiltration, reverse osmosis and advanced oxidation using UV- peroxide. Unique to this project is treatment of the reverse osmosis waste stream to remove nitrogen and phosphorus prior to discharge to a brackish river. In addition, high levels of ortho phosphorus can adversely impact the RO operation due to scaling. Several nutrient reduction alternatives were considered to determine the preferred location for nutrient reduction. The recommended plan included pre-treatment of the AWTP feed water to reduce ortho phosphates to a concentration that would not result in scaling of the RO units and would minimize the quantity of phosphorus removal required in the ROC to meet the discharge permit. A storage basin will provide equalization of the ROC prior to chemical/physical treatment for phosphorus removal in a high rate solids contact clarification process. Chemical feed to the solids contact clarifiers will include bisulfite for dechlorination, caustic for alkalinity and pH control, and ferric chloride and polymer for coagulation and chemical precipitation of phosphorus. Deep bed denitrification filters will provide nitrate removal using methanol as a carbon source.
机译：昆士兰州的西部走廊再生水项目（WCRWP）将从市政府回收水以重复使用，以减少当前来源的工业用户的需求，也可能还可以补充来源水。将构建共有三种AWTP以从六个废水处理厂治疗二级流出物，以提供310 MLD的最终再利用供水。第一个项目Bundamba-A，于2007年9月进入服务，初始容量为20 MLD。第二阶段，Bundamba-B将于2008年中期进入服务，以提供额外的40 MLD。液体流过程将包括使用紫外过氧化物的微滤，反渗透和晚期氧化。该项目的独特是治疗反渗透废料流，以在排放到咸水河之前除去氮和磷。此外，由于缩放，高水平的邻磷可能会对RO操作产生不利影响。考虑了几种营养素减少替代方案以确定营养素减少的优选位置。推荐的计划包括预处理AWTP进料水以将纯磷酸盐降低到不会导致RO单元缩放的浓度，并最大限度地减少ROC所需的磷去除量以满足排放许可。在高速速率固体接触澄清过程中，储存盆地将在化学/物理处理之前提供ROC的均衡。化学进料到固体接触澄清剂将包括亚硫酸硫酸氢硫酸氢盐，碱性和pH控制，以及氯化铁和聚合物的粘性和化学沉淀。深层床脱氮过滤器将使用甲醇作为碳源提供硝酸盐去除。

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