摘要：

某煤化工企业的中水回用水站存在回收率低、浓盐水排放量超出设计值等问题，应急水池溢流情况时有发生。需对浓盐水进行浓缩处理，出水可作为循环冷却水补水。采用机械澄清池+多介质过滤器+离子交换系统+除碳器+高效反渗透工艺对回用水站浓盐水进行浓缩，其中高效反渗透装置为浓盐水浓缩核心工艺。在预处理彻底去除硬度的前提下，高效反渗透装置可在高pH条件下稳定运行。与普通酸性运行条件相比，该工艺耐有机污染能力强，浓盐水回收率达到80%以上，系统浓水总溶固（TDS）≤ 64 500 mg/L，产水水质可满足GB/T 19923—2005《城市污水再生利用工业用水水质》中循环冷却水的补水要求。

关键词: 高效反渗透, 浓盐水, 煤化工

Abstract:

The recovery rate of reclaimed water reuse station in a coal chemical enterprise is low, and the discharge of concentrated brine exceeds the design value. The overflow of emergency pool happens sometimes. It is necessary to concentrate the brine, and the effluent can be used as recirculated cooling water. The concentrated brine from the reuse station was concentrated by mechanical clarification tank+multi-media filter+ion exchange system+carbon dioxide cleaner+high-efficiency reverse osmosis process. Among of them, high-efficiency reverse osmosis was the core process of concentrated brine concentration. On the premise that the hardness was completely removed by pretreatment, the high-efficiency reverse osmosis device was able to operate stably under high pH conditions. Compared with ordinary acidic operating conditions, the process was more resistant to organic pollution. The recovery rate of concentrated brine reached more than 85%, and the system's concentrated water TDS was less than or equal to 64 500 mg/L. The quality of produced water could meet the requirement of recirculating cooling water in The Reuse of Urban Recycling Water: Water Quality for Industrial Uses from GB/T 19923-2005.

Key words: highly efficient reverse osmosis, concentrated brine, coal chemical industry

中图分类号: 

• X703