Department of Bioengineering, Istanbul Medeniyet University, 34700, Istanbul, Turkey; Environmental and Energy Systems Engineering Program, Istanbul Medeniyet University, 34700, Istanbul, Turkey.
Environmental and Energy Systems Engineering Program, Istanbul Medeniyet University, 34700, Istanbul, Turkey.
J Environ Manage. 2018 Sep 15;222:420-427. doi: 10.1016/j.jenvman.2018.05.057.
Industrial wastewater reuse together with zero or near zero liquid discharges have been a growing trend due to the requirement of sustainable water management mandated by water scarcity and tightening discharge regulations. Studies have been conducted on the reclamation of textile industry wastewater using RO processes. However a lot of scientific attention has been drawn upon limiting the amount of concentrate generated from RO processes, which depends on the concentrations of scale forming ions in the concentrate stream. Hence, this study aims at investigating the applicability of an ultra-filtration (UF) membrane integrated pellet reactor to remove scale forming ions, i.e. Ca, Mg and Si from the concentrate of a pilot-scale textile industry RO process, for the first time in the literature. The resulting effluent was further tested in a secondary RO process to decrease concentrate volume and increase total water recovery. The pellet reactor operated at an extremely low hydraulic retention time of 0.1 h removed scale forming ions, i.e. Ca, Mg, with 90-95% efficiency, which improved the secondary RO process performance up to 92-94% overall water recovery, i.e. near zero liquid discharge was reached. Ozonation of the concentrate partially removed COD and color, which further improved the secondary RO filtration performance.
由于缺水和排放法规收紧，可持续水资源管理的要求，工业废水再利用和零或近零液体排放已经成为一种发展趋势。已经有研究采用反渗透（RO）工艺对纺织工业废水进行了再利用。然而，大量的科学研究都集中在限制 RO 工艺产生的浓缩物的量上，这取决于浓缩物中结垢离子的浓度。因此，本研究首次在文献中旨在研究一种超滤（UF）膜集成颗粒反应器用于去除浓缩物中的结垢离子，即 Ca、Mg 和 Si 的适用性，这是在文献中首次进行的。所得的出水在二级 RO 工艺中进一步测试，以减少浓缩物的体积并提高总水回收率。颗粒反应器在极低的水力停留时间（0.1 h）下运行，可去除结垢离子，即 Ca、Mg，去除效率为 90-95%，从而提高了二级 RO 工艺的性能，达到了 92-94%的总水回收率，即实现了近零液体排放。浓缩物的臭氧氧化部分去除了 COD 和颜色，进一步提高了二级 RO 过滤性能。
