The use of readily available water treatment residuals (WTR) as a low-cost material for removal of colour from real textile wastewater was investigated. WTR was used in three forms, namely in raw wet form as a coagulant, in the dried form as an adsorbent and as a filtration media in column tests. The results showed a maximum colour removal of 55 and 36% by coagulation and adsorption, respectively, and the corresponding COD removals were 35 and 37%. Coagulation and batch sorption tests showed the effect of initial pH on the colour removal, and maximum colour removal was obtained at an initial pH of 3.0. Long-duration continuous-flow column test using WTR as a filtration/sorption media showed that a maximum colour removal of 60% can be achieved. In column studies, complete exhaustion of the media occurred at 180 and 120 bed volumes, respectively, for initial pHs of 3.0 and 6.2. The study thus shows the potential of WTR for primary treatment of real textile dye wastewater.

中文翻译：

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使用水处理残留物从真纺织品染料废水中脱色

研究了使用现成的水处理残留物（WTR）作为低成本材料从真实纺织品废水中去除颜色的方法。WTR以三种形式使用，即以湿的原始形式用作凝结剂，以干燥的形式用作吸附剂和在柱测试中用作过滤介质。结果表明，通过凝结和吸附，最大脱色率分别为55％和36％，相应的COD去除率分别为35％和37％。混凝和批吸附测试表明初始pH对脱色的影响，并且在初始pH为3.0时获得最大脱色。使用WTR作为过滤/吸附介质的长时间连续流色谱柱测试表明，可以实现60％的最大脱色率。在色谱柱研究中，分别在180和120床体积下发生了介质的完全耗尽，初始pH为3.0和6.2。因此，该研究表明了WTR在真正的纺织品染料废水的初级处理中的潜力。