Abstract:

Reverse osmosis membrane pollution is common in power plant boiler feed water treatment systems. In view of the fouling of two sets of reverse osmosis devices in a power plant，the fouling situation was described，which was reflected in the increase of pressure difference and the decrease of flow rate. The probe test and chemical measurement methods were used to determine the types of pollutants，mainly including microbial pollution， metal oxide and colloid pollution. Furthermore，the cause of the pollution was analyzed. A chemical cleaning method that combined non⁃oxidizing bactericide cleaning and alkaline cleaning was used to clean the reverse osmosis membrane. The cleaning process and control points were described in detail. The data before and after cleaning were analyzed. After cleaning，the pressure difference dropped to 50% of that before cleaning and returned to 0.08-0.11 MPa. The inlet and product water flow increased by 26% and 27.5% respectively，achieving the ideal cleaning effect.

Key words: reverse osmosis membrane pollution, chemical cleaning, microorganism, colloid

摘要：

反渗透膜污染常见于电厂锅炉补给水处理系统。针对某电厂2套反渗透装置发生的污堵，分析了污堵情况，体现在一段压差增大和流量下降；利用探针试验和化学测定的方法确定了污染物类型，主要为微生物污染、金属氧化物和胶体污染，并分析了污染原因。采用非氧化性杀菌剂清洗和碱洗相结合的清洗方法，对反渗透膜进行了化学清洗。详细描述了清洗流程及工艺控制要点，对清洗前后数据进行分析，清洗后一段压差下降至清洗前的50%，恢复至0.08~0.11 MPa，进水流量和产水流量分别提高了26%和27.5%，达到了理想的清洗效果。

关键词: 反渗透膜污染, 化学清洗, 微生物, 胶体

CLC Number: 

• X703.1