Treatment of real textile wastewater by coagulation/flocculation integrated with direct contact membrane distillation

IF 2.3 4区工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY Separation Science and Technology Pub Date : 2023-08-08 DOI:10.1080/01496395.2023.2245135

Regilene de Sousa Silva, Heloísa Duarte Rengel, Francis Dalponte Voigt, R. Machado, Regina de Fátima Peralta Muniz Moreira, C. Marangoni

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引用次数: 1

Abstract

ABSTRACT This study investigated the water recovery of real textile wastewater by Coagulation/Flocculation (CF) integrated with Direct Contact Membrane Distillation (DCMD). The proof-of-concept tests were studied with synthetic solutions of reactive and disperse black dyes at different concentrations, and real textile wastewater from the discharge machine and the equalization tank. Results showed that CF-DCMD exhibited higher permeate fluxes (up to 40%) than single DCMD and maximum color rejection rates (100%). Moreover, CF-DCMD enabled water reclamation from cotton and polyester dyeing wastewater which was not possible by MD (Membrane Distillation). The integrated system showed excellent chemical oxygen demand removal capacity, total suspended solids, turbidity, conductivity reduction, and removed any signs of toxicity from the tested wastewater. The coagulation/flocculation process prior to the MD reduced the fouling factor for all wastewater, highlighting the equalization tank where a reduction of around 72% was observed, achieving the goal of reducing fouling and increasing the efficiency of the MD. Membrane characterization indicated that CF-DCMD confirmed less fouling of membranes than single DCMD. Thus, this study allows to understand the potential and robustness of the CF-DCMD process in the treatment of textile wastewater and that it is possible to develop alternative technologies to treat complex wastewater effectively. GRAPHICAL ABSTRACT

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混凝/絮凝与直接接触膜蒸馏相结合处理真实纺织废水

摘要:研究了混凝/絮凝(CF)与直接接触膜蒸馏(DCMD)联合处理纺织废水的工艺。采用不同浓度的活性和分散黑色染料的合成溶液，以及排放机和均衡池的真实纺织废水进行了概念验证试验。结果表明，CF-DCMD比单一DCMD具有更高的渗透通量(高达40%)和最大的颜色拒绝率(100%)。此外，CF-DCMD还实现了棉、涤纶印染废水的水回收，这是膜蒸馏法无法实现的。综合系统表现出优异的化学需氧量去除能力，总悬浮物，浊度，电导率降低，并从测试废水中去除任何毒性迹象。在MD之前的混凝/絮凝工艺降低了所有废水的污染系数，其中均衡池的污染系数降低了约72%，达到了减少污染和提高MD效率的目标。膜表征表明，CF-DCMD比单一DCMD证实膜的污染更少。因此，本研究可以了解cf - dmd工艺在处理纺织废水中的潜力和稳健性，并有可能开发出有效处理复杂废水的替代技术。图形抽象

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来源期刊

Separation Science and Technology 工程技术-工程：化工

CiteScore

6.10

自引率

3.60%

发文量

131

审稿时长

5.7 months

期刊介绍： This international journal deals with fundamental and applied aspects of separation processes related to a number of fields. A wide range of topics are covered in the journal including adsorption, membranes, extraction, distillation, absorption, centrifugation, crystallization, precipitation, reactive separations, hybrid processes, continuous separations, carbon capture, flocculation and magnetic separations. The journal focuses on state of the art preparative separations and theoretical contributions to the field of separation science. Applications include environmental, energy, water, and biotechnology. The journal does not publish analytical separation papers unless they contain new fundamental contributions to the field of separation science.