In this study, textile dye bath wastewater was treated by subcritical water oxidation (SCWO) and pressure-driven membrane process. 54.5% of chemical oxygen demand (COD) reduction and 91.7% of color removal were obtained using eco-friendly SCWO method in the presence of H₂O₂. Box-Behnken design was performed to optimize the SCWO process and precision of the models were evaluated by ANOVA. Two different nanofiltration (NF270 and NF90) membranes were tested before and after SCWO pretreatment. The effect of membrane type (NF270 and NF90) and transmembrane pressure (10, 20, 30, 40 bar) was studied to improve COD reduction and colour removal efficiency. The results showed that steady-state permeate flux increased from 6.6 to 23.5 L/m².h for NF270 at 30 bar and from 10.0 to 12.4 L/m².h for NF90 membrane at 40 bar when SCWO was applied as the pretreatment method. The results depicted that SCWO pre-treatment increased the permeate flux almost 2-3 fold. COD was also tested for all permeates and the highest COD reduction efficiency was obtained for SCWO+NF90 combined process. The highest COD reduction and color removal efficiencies were obtained as 96.1% and 99.3%, respectively, for combined SCWO+NF90 process at 40 bar. The proposed combined SCWO+NF90 process was successfully used to recover wastewater from textile dye bath wastewater.

在这项研究中，纺织品染料浴废水通过亚临界水氧化（SCWO）和压力驱动膜工艺进行处理。在H ₂ O ₂存在下，使用环保的SCWO方法获得的化学需氧量（COD）降低了54.5％，脱色率达到91.7％。进行Box-Behnken设计以优化SCWO工艺，并通过ANOVA评估模型的精度。在SCWO预处理之前和之后，测试了两种不同的纳滤膜（NF270和NF90）。研究了膜类型（NF270和NF90）和跨膜压力（10、20、30、40 bar）的影响，以提高COD的减少和除色效率。结果表明，稳态渗透通量从6.6增加到23.5 L / m ²当使用SCWO作为预处理方法时，NF270在30 bar时的压力为.h，在NF90膜在40 bar的压力时为10.0至12.4 L / m ² .h。结果表明，SCWO预处理将渗透通量提高了近2-3倍。还对所有渗透液进行了COD测试，对于SCWO + NF90组合工艺，COD还原效率最高。SCWO + NF90组合工艺在40 bar下的最高COD减少率和脱色效率分别为96.1％和99.3％。提出的SCWO + NF90组合工艺已成功用于从纺织染浴废水中回收废水。