Abstract:

The effluent from a large-scale coking plant in Shandong treated by a conventional biochemical method has been used as raw water,and treated in depth by multi-medium filter-hollow fiber UF membrane-DEC adsorption resin filter-reverse osmosis membrane process. The results show that the effluent COD from DEC adsorption resin filter is less than 60 mg/L,removing rate higher than 69%,total cyanide less than 0.2 mg/L,NH₃-N less than 5 mg/L, chroma less than 20 times,and stable operation cycle longer than 36 h. It can meet the discharge requirements specified in the Discharge Standard of Pollutants from Coking Chemical Industry(GB 16171-2012). DEC absorption resin filter rinsing and reclaimed water are recovered by nanofiltration(NF) membrane. The produced water can be used for DEC rinsing and resin regeneration make-up water. The RO system wastewater recovery rate is higher than 65%,stable operation cycle longer than 70 d. The produced water conductivity is less than 100 μS/cm,removing rate higher than 98%,turbidity less than 0.1 NTU,COD less than 10 mg/L. It can meet the requirements for water quality standard of circulating water,cooling water,and make-up water,specified in the Wastewater Recycling Engineering Design Specification(GB 50335-2002) and being reused in coking production.

Key words: coking wastewater, adsorption resin, RO membrane, COD, chrome

摘要：

以山东某大型焦化厂焦化废水常规生化处理出水为原水，采用多介质过滤器-中空纤维超滤膜-DEC吸附树脂过滤器-反渗透膜工艺进行深度处理。结果表明：DEC吸附树脂过滤器出水COD小于60 mg/L，COD去除率大于69%，总氰化物 < 0.2 mg/L，NH₃-N < 5 mg/L，SS < 5 mg/L，色度 < 20倍，稳定运行周期大于36 h，出水满足GB 16171-2012《炼焦化学工业污染物排放标准》排放要求。DEC吸附树脂过滤器冲洗和再生废水采用纳滤膜回收，产水用于DEC冲洗和树脂再生补水。反渗透膜处理系统水回收率大于65%，稳定运行周期大于70 d。产水电导率小于100μS/cm，浊度小于0.1 NTU，COD小于10 mg/L，满足《污水再生利用工程设计规范》（GB 50335-2002）中循环水冷却水补水水质标准要求，可回用焦化生产。

关键词: 焦化废水, 吸附树脂, 反渗透膜, 化学需氧量（COD）, 色度

CLC Number: 

• X703