钢铁厂焦化废水深度处理的试验研究

Advanced Treatment of Coking Wastewater in Steel Plant

针对钢铁厂焦化废水生化处理出水COD浓度高、可生化性差、容易造成膜污堵的特点,提出了电气浮/电催化氧化/超滤/反渗透深度处理工艺,并在首钢某焦化厂进行了中试。结果表明:电气浮/电催化氧化单元能够有效降解废水中的COD和氨氮,保证了后续双膜工艺的进水水质、减轻了膜污染;系统产水率>65%,产水水质达到了钢铁厂净环冷却水的补水水质要求,浓盐水可以作为高炉水冲渣系统的补水,从而可以实现钢铁厂焦化废水的零排放。

To address high COD concentration, poor biodegradability and membrane fouling by biologieal effluent of eoking wastewater in steel plants, a combined proeess of electroflotation, eleetrocatalyric oxidation, uhrafihration and reverse osmosis was proposed, and a pilot test in a coking plant belonging to Shougang Group was eonducted. The results showed that the electroflotation and eleetrocatalytic ox- idation units eould effeetively degrade COD and NH4 - N, whieh ensured high influent quality of subse- quent double-membrane process and reduced membrane fouling. The water yield was more than 65% , and the water quality met the requirements for make-up water of eireulating cooling water system in the steel plant. The eoneentrated brine could be used as make-up water of blast furnace slag flushing water system, effectively reducing the discharge of coking wastewater in the steel plant to zero.