硅酸水垢及防治方法研究进展

在水资源再生利用过程中水中硅酸会沉淀在设备管道内壁或膜表面形成硅垢,影响设备的正常运行。硅垢的主要成分为无机硅酸盐和无定形SiO_2,是最难处理的水垢。抑制硅垢的方法有设备内添加阻垢剂和设备外预处理降低硅酸浓度等。设备内添加阻垢剂的方法又包括提高硅酸溶解度法和投加分散剂法;设备外预处理降低硅酸浓度的方法包括超滤膜法、反渗透膜法、絮凝法、离子交换法等。

Research progress in silicic acid scale and its prevention methods

Silicic acid in water can precipitate on the inner walls of equipment pipelines or on the membrane surfac-es,to form silica scale in the process of water resource recycling,hindering the equipment from working normally. The main components of silica scale are inorganic silicate and amorphous SiO2,the most refractory water scale. The methods for inhibiting silica scale include:(1)adding scale inhibitor to the inside of the equipment;(2)reducing silicic acid concentration by pretreatment outside the equipment. Furthermore ,Method l includes:increasing the solubility of silicic acid and adding dispersant,and Method 2 includes:ultra-filtration method,RO membrane method,flocculation method,ion exchange method,etc.