Titanium Coagulation Simplified Removal Procedure and Alleviated Membrane Fouling in Treatment of Antimony-Containing Wastewater,ACS ES&T Engineering

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Titanium Coagulation Simplified Removal Procedure and Alleviated Membrane Fouling in Treatment of Antimony-Containing Wastewater
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2021-05-18 , DOI: 10.1021/acsestengg.1c00074
Bingdang Wu ₁ , Jingbiao Li ₁ , Yonghai Gan ₁ , Haojie Li ₁ , Linhui Dong ₂ , Shujuan Zhang ₁

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The removal of antimony (Sb) from textile and dyeing wastewater is a challenging task. To meet the discharge limit and the demand for water reuse, the currently available treatment process was complicated: first, coagulation with polyaluminum chloride (PAC) and polyacrylamide (PAM) prior to membrane filtration to remove turbidity and then coagulation with polyferric sulfate (PFS) after membrane filtration to remove Sb from the concentrate. Such a process is troublesome in operation and generates a large amount of hazardous sludge. Here, we report that using a titanium xerogel coagulant (TXC) prior to membrane filtration could simultaneously remove the turbidity and the residual Sb in one-step. With TXC as the coagulants, no after-membrane coagulation was needed. Moreover, the TXC coagulation significantly alleviated the membrane fouling. A 24-day running of a pilot-scale test demonstrates that addition of 60 mg/L of TXC reduced the residual Sb concentration in the effluent from 226–894 μg/L to below the discharge limit (<50 μg/L). Meanwhile, the operating time of the ultrafiltration (UF)–reverse osmosis (RO) membrane system was prolonged, because of alleviated membrane fouling. This work indicates that TXC coagulation is a promising strategy for the treatment of Sb-containing wastewater. The simplified treatment procedure and the alleviated membrane fouling are helpful in reducing the processing costs for water reuse.

中文翻译：

钛混凝处理含锑废水简化去除程序和减轻膜污染

从纺织和印染废水中去除锑 (Sb) 是一项具有挑战性的任务。为满足排放限值和中水回用需求，目前可用的处理工艺较为复杂：先用聚合氯化铝（PAC）和聚丙烯酰胺（PAM）混凝，再用膜过滤除浊，再用聚合硫酸铁（PFS）混凝膜过滤以去除浓缩物中的 Sb。这种工艺操作麻烦，产生大量有害污泥。在这里，我们报告说，在膜过滤之前使用钛干凝胶凝结剂 (TXC) 可以一步同时去除浊度和残留的 Sb。用TXC作为混凝剂，不需要膜后混凝。此外，TXC 凝结显着减轻了膜污染。一项为期 24 天的中试规模测试表明，添加 60 mg/L TXC 可将流出物中的残余 Sb 浓度从 226–894 μg/L 降低到排放限值以下 (<50 μg/L)。同时，由于减少了膜污染，超滤（UF）-反渗透（RO）膜系统的运行时间延长了。这项工作表明TXC混凝是处理含Sb废水的有前途的策略。简化的处理程序和减轻的膜污染有助于降低中水回用的处理成本。由于减少了膜污染，超滤 (UF)-反渗透 (RO) 膜系统的运行时间延长了。这项工作表明TXC混凝是处理含Sb废水的有前途的策略。简化的处理程序和减轻的膜污染有助于降低中水回用的处理成本。由于减少了膜污染，超滤 (UF)-反渗透 (RO) 膜系统的运行时间延长了。这项工作表明TXC混凝是处理含Sb废水的有前途的策略。简化的处理程序和减轻的膜污染有助于降低中水回用的处理成本。

更新日期：2021-07-09

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