Canadian Natural Resources Ltd., Fort McMurray, Alberta, T9H 3H5, Canada.
David Bromley Engineering Ltd., West Vancouver, British Columbia, V7S2N6, Canada.
J Environ Manage. 2015 Sep 15;161:113-123. doi: 10.1016/j.jenvman.2015.06.031. Epub 2015 Jul 8.
Through sustainable water management, oil sands companies are working to reduce their reliance on fresh water by minimizing the amount of water required for their operations and by recycling water from tailings ponds. This study was the first pilot-scale testing of a hybrid technology consisting of froth flotation combined with filtration through precoated submerged stainless steel membranes used to treat recycle water from an oil sands facility. The results indicated that the most important factor affecting the performance of the hybrid system was the influent water quality. Any rise in the levels of suspended solids or total organic carbon of the feed water resulted in changes of chemical consumption rates, flux rates, and operating cycle durations. The selections of chemical type and dosing rates were critical in achieving optimal performance. In particular, the froth application rate heavily affected the overall recovery of the hybrid system as well as the performance of the flotation process. Optimum surfactant usage to generate froth (per liter of treated water) was 0.25 mL/L at approximately 2000 NTU of influent turbidity and 0.015 mL/L at approximately 200 NTU of influent turbidity. At the tested conditions, the optimal coagulant dose was 80 mg/L (as Al) at approximately 2000 NTU of influent turbidity and <40 mg/L (as Al) at approximately 200 NTU of influent turbidity. Precoat loading per unit membrane surface area tested during the pilot study was approximately 30 g/m(2). The results of this study indicated that this hybrid technology can potentially be considered as a pre-treatment step for reverse osmosis treatment of recycle water.
通过可持续的水资源管理，油砂公司正在努力减少对新鲜水的依赖，尽量减少其运营所需的水量，并通过对尾矿池中的水进行回收利用。本研究是首次对一种混合技术进行中试规模测试，该技术由泡沫浮选与预涂覆的浸没式不锈钢膜过滤相结合，用于处理油砂设施的回用水。结果表明，影响混合系统性能的最重要因素是进水水质。进水的悬浮固体或总有机碳水平升高，都会导致化学需氧量的消耗率、通量和运行周期持续时间发生变化。化学物质类型和投加率的选择对于实现最佳性能至关重要。特别是泡沫的施加率对混合系统的整体回收率以及浮选过程的性能有很大影响。生成泡沫的最佳表面活性剂用量（每处理水升）在进水浊度约为 2000 NTU 时为 0.25 毫升/升，在进水浊度约为 200 NTU 时为 0.015 毫升/升。在测试条件下，最佳混凝剂剂量为 80 毫克/升（以 Al 计），进水浊度约为 2000 NTU，<40 毫克/升（以 Al 计），进水浊度约为 200 NTU。在中试研究期间，每单位膜表面积的预涂覆量约为 30 克/平方米。本研究结果表明，该混合技术可作为反渗透处理回用水的预处理步骤。
