Reuse of reverse osmosis concentrate in textile and dyeing industry by combined process of persulfate oxidation and lime-soda softening

摘要: Abstract The advanced oxidation technology dominated the disposal of reverse osmosis concentrate in textile and dyeing industry due to its extremely low biodegradability. For resource conservation sustainable development, was reused procedure after being treated properly with combining method persulfate lime-soda softening. Firstly, refractory organics oxidized by thermal activation results indicated that most efficient economical reaction happened initial pH = 5.0, 1000 mg/L concentration 75 °C. In this process, chemical oxygen demand degradation fitted pseudo-first-order model well sodium sulfate increased from 9600 about 10,350 mg/L. Then, hardness including Ca 2+ Mg softened efficiently softening appropriate lime soda determined be 150 mg/L 800 mg/L, respectively. Finally, effluent employed as water test reuse feasibility reactive dyes. Color strength, color difference fastness were all used evaluate performance showed which (COD ≤ 21.5 mg/L, total ≤17.0 mg/L) available for dyes procedure. study provided a novel treat more importantly, it promoted saved supplementation cost