摘要
Abstract
High salinity coal mine water often has the characteristics of high salt content,high hardness and alkalinity,and the treatment process is complex and difficult.The design influent capacity of an advanced treatment and reuse project of a certain coal mine water in Shaanxi Province is 7 200 m3/d,water yield is 4 800 m3/d(25℃),and the design system recovery rate is 65%.UF+RO double-membrane process is used in this project,and the effluent water is reused for underground production.In this project,through quantitative dosing composite scale inhibitor,the traditional chemical softening process is replaced and the costs of investment and operating are reduced.Operation data indicates that,the temperature of the raw mine water witch is pretreated through grille,pre-sedimentation regulating tank and magnetic loading precipitation,is about 27℃,TDS is 3 700～4 000 mg/L,and hardness is 450～500 mg/L;the TDS in effluent water is about 70 mg/L,hardness is no more than 6.0 mg/L,Cl-is less than 35 mg/L,SO2-4 is less than 5.5 mg/L,the salt rejection rate is 98%,and the system recovery rate is 71.4%,the whole system runs stable and reliable.关键词
矿井水回用/深度处理/超滤(UF)/反渗透(RO)/双膜法/软化工艺Key words
reuse of mine water/advanced treatment/ultrafiltration(UF)/reverse osmosis(RO)/double-membrane process softening process分类
建筑与水利
