本文总结了为期一年的试点项目的结果，以评估三个 废过滤器反冲洗水回收的替代固体分离工艺。初选 这项研究的目的是选择一个过程，以满足减少或减少风险的双重目标 消除420 ML/d Bearspaw水处理厂的工艺废水排放 （WTP）位于加拿大阿尔伯塔省卡尔加里，同时避免对主要WTP造成任何不良影响 与美国一样，加拿大也制定了处理和处置水处理厂残留物的法规和标准 仍在发展中。对于这个特定的项目，我们制定了一系列处置/再利用策略 已调查，每种情况都需要不同的处理标准，如下所示: 将处理过的水以低于20 mg/L TSS的浓度排放至鲍河； 在小于5 NTU的情况下，将处理过的水循环至水处理厂的水头；和 饮用水生产的膜处理。 1台大。 为试点评估预先选择了以下三个过程: 使用平板沉降器澄清器增强重力沉降； 使用溶解气浮（DAF）澄清器进行浮选；和 使用超滤（UF）膜系统进行过滤。 所评估的工艺涵盖了可能需要的广泛的处理标准 最终使用/处置路线。可达到的出水水质、设计标准和操作条件 本文在大量试验的基础上介绍了评估过程的性能 在Bearspaw试验工厂收集的数据。 所有三种工艺均被证明符合或超过其预期目的的验收标准 使用这三个过程都有一些意想不到的发现。例如 超滤膜工艺超出了制造商的预试验预期。 这个 这项试验计划的长度允许进行大量的操作和维护 在非常广泛的水质条件和温度范围内收集数据。 研究了化学剂量优化、膜化学清洗制度和水质数据 收集并评估，以确定每个过程的设计和操作标准。 试点评估的结果用于制定以下一般流程标准: 在哈森负荷率为0.6至0.8 m/h的情况下，出水目标小于5 NTU的平板沉降器； 以10 m/h的负荷率进行溶解气浮，出水目标<2 NTU；和 设计流量为42 Lmh时，出水目标小于0.1 NTU的超滤膜 （25 gfd）和99%的饮用水回收率。 最后，讨论了全面实现的考虑因素，例如源分离 废物流、均衡化、循环流工艺影响和残余固体处理。 包括9个参考文献、表格、图表。

This paper summarizes the results of a year-long piloting program to evaluate three alternative solids separation processes for spent filter backwash water recovery. The primary goal of this study was to select a process that would meet the dual objectives of reducing or eliminating process wastewater discharges from the 420 ML/d Bearspaw water treatment plant (WTP) in Calgary, Alberta, Canada, while avoiding any undesirable impacts on the main WTP In Canada, as in the US, regulations and standards for treating and disposing of WTP residuals are still evolving. For this particular project, a range of disposal/reuse strategies were investigated, each requiring differing treatment standards as follows: disposal of treated water to the Bow River at < 20 mg/L TSS; recycling of treated water to the head of the WTP at < 5 NTU; and, membrane treatment for potable water production at < 0.1 NTU. Three processes were pre-selected for the pilot evaluation as follows: enhanced gravity settling using a plate settler clarifier; flotation using a dissolved air flotation (DAF) clarifier; and, filtration using an ultrafiltration (UF) membrane system. The processes evaluated covered the broad range of treatment standards potentially required for the final end use/disposal route. The achievable effluent quality, design criteria, and operating performance of the evaluated processes are presented in this paper, based on extensive piloting data collected at the Bearspaw pilot plant facility. All three processes were proven to meet or exceed the acceptance criteria for their intended end use. There were some unexpected discoveries regarding all three processes. For example, the ultrafiltration membrane process exceeded its manufacturer's pre-piloting expectations. The length of this piloting program allowed for a considerable amount of operating and maintenance data to be collected over a very broad range of water quality conditions and temperatures. Chemical dose optimization, membrane chemical cleaning regimes, and water quality data were collected and evaluated to establish both the design and operational criteria for each process. The results of the pilot evaluation were used to formulate the following general process criteria: plate settlers with an effluent target of <5 NTU at a Hazen loading rate of 0.6 to 0.8 m/h; dissolved air flotation with an effluent target of <2 NTU at a loading rate of 10 m/h; and, ultrafiltration membranes with an effluent target of <0.1 NTU at a design flux of 42 Lmh (25 gfd) and a recovery rate of 99% for potable water production. Finally, considerations for full-scale implementation are discussed, such as source separation of waste streams, equalization, recycle stream process impacts, and residual solids processing. Includes 9 references, tables, figures.