Horan N J, Lowe M
School of Civil Engineering, The University, Leeds, LS2 9JT UK.
Water Res. 2007 Jan;41(1):253-9. doi: 10.1016/j.watres.2006.08.028. Epub 2006 Oct 30.
Pilot-scale trials at a domestic wastewater treatment works compared the performance of three grades of recycled glass (coarse, medium and fine) when used as tertiary filter media for total suspended solids removal (TSS). Fine glass produced the best effluent quality but blinded rapidly and coarse glass could process three times the flow but with a reduction in final effluent quality. The medium glass offered a compromise with similar flow characteristics to the coarse glass, yet still achieve good solids removal, albeit less than the fine glass. Full-scale studies compared the performance of medium glass with the sand medium that is typically used in this application. There was little difference between them in terms of TSS removal, and they both removed around 75% of TSS from the influent, provided that the solids concentration did not exceed 70mg/l. However, the glass media had superior flow characteristics and was able to treat an additional 8-10% of the influent following the backwash cycle. Over the study period, the influent to the filters had an average TSS concentration of 38mg/l and produced an effluent with an average of 15mg TSS/l. In order to design for an average TSS concentration of 20mg/l, the maximum solids loading on the medium should not exceed 0.25kg solids/m(3)/h. Selecting recycled glass as a tertiary filter medium will give a 10% reduction in the amount of media required, compared to sand. It also carries with it the benefits of using a recycled material, and although these are more difficult to quantify they include: reduced CO(2) emissions and use of a more sustainable product that promotes favourable publicity and positive environmental reporting.
在一家生活污水处理厂进行的中试规模试验，比较了三种粒度等级的回收玻璃（粗、中、细）作为三级过滤介质去除总悬浮固体（TSS）的性能。细玻璃产生的出水水质最佳，但很快就会堵塞，粗玻璃的处理流量可为细玻璃的三倍，但最终出水水质会下降。中玻璃提供了一种折衷方案，其水流特性与粗玻璃相似，但仍能实现良好的固体去除效果，尽管不如细玻璃。全尺寸研究比较了中玻璃与该应用中通常使用的砂介质的性能。在去除TSS方面，它们之间几乎没有差异，只要固体浓度不超过70mg/l，它们都能去除进水约75%的TSS。然而，玻璃介质具有更好的水流特性，在反冲洗周期后能够多处理8-10%的进水。在研究期间，过滤器的进水平均TSS浓度为38mg/l，产生的出水平均TSS为15mg/l。为了设计平均TSS浓度为20mg/l的情况，介质上的最大固体负荷不应超过0.25kg固体/m³/h。与砂相比，选择回收玻璃作为三级过滤介质将使所需介质量减少10%。它还带来了使用回收材料的好处，尽管这些好处更难量化，但包括：减少二氧化碳排放以及使用更具可持续性的产品，这有助于提升良好的公众形象和积极的环境报告。
