印染RO浓水深度处理及回用

采用Fenton-石灰苏打法耦合工艺对某印染厂印染反渗透(RO)浓水进行深度处理。通过实验研究了不同H2O2和Fe2+投加量、pH和反应时间对废水COD去除率的影响,以及不同石灰和碳酸钠投加量对废水硬度的脱除效果,出水回用于染色工段进行染色实验。结果表明,在pH=3.0,Fe2+投加量为1.5 mmol/L,H2O2投加量为3.75 mmol/L,反应时间为45 min,石灰和碳酸钠投加量分别为450 mg/L和1 000 mg/L的条件下,出水COD和硬度的去除率可分别达到73.9%和85.0%,耦合工艺出水水质符合该厂回用染色水标准,且减少了盐的使用,可实现印染RO浓水回用。

Advance treatment and reuse of dyeing reverse osmosis brine

A coupling process of Fenton and lime-soda softening was applied for the advanced treatment of the reverse osmosis brine in a textile plant. The effects of different dosages of H2O2 and Fe2+, oxidation time and pH value on COD removal were studied, as well as dosages of lime and soda for removing hardness. Finally, the effluent was recycled for dye test in the dyeing process. Results show that when Fenton reacted for 45 mins with initial pH=3.0, 1.5 mmol/L of Fe2+, 3.75 mmol/L of H2O2 and lime-soda process went ahead with 450 mg/L lime and 1 000 mg/L soda, the effluent COD and hardness removal rate were 73.9% and 85.0%, respectively. The final effluent met the recycle dyeing water standards, meanwhile, it proved that the salt in dyeing process could be reduced and the RO brine could be reused.