铜质给水管道中铝垢的形成与转化机制研究  

Formation and Transformation Characteristics of Aluminum Scales in Copper Drinking Water Distribution Pipeline

作　　者：余春育 白居蓉 柳剑男 王文东[1,2] YU Chun-yu;BAI Ju-rong;LIU Jian-nan;WANG Wen-dong(School of Environmental and Municipal Engineering,Xi＇an University of Architecture and Technology,Xi＇an 710055,China;School of Human Settlements and Civil Engineering,Xi＇an Jiaotong University,Xi＇an 710049,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055 [2]西安交通大学人居环境与建筑工程学院,陕西西安710049

出　　处：《中国给水排水》2018年第19期17-22,共6页China Water & Wastewater

基　　金：国家自然科学基金资助项目(21007050);教育部博士点基金资助项目(20106120120014);陕西省重大科技成果转化引导专项(2016KTCG01-17)

摘　　要：铝盐混凝剂在管网水中的残留现象十分普遍。以CBR反应器模拟给水管网,研究了残余铝浓度和pH值对铝垢在铜质管道表面形成与转化过程的影响。结果表明,降低残余铝浓度可有效减缓铝垢的形成速率,而pH值变化对铝垢的形成速率影响较小。模拟管网系统运行10d后,管道内壁已开始出现铝沉积,主要成分以无定形氢氧化铝为主。30 d后,在残余铝浓度>0.2mg/L、pH值=7.0的环境下,管道内壁开始出现Cu_6Al_2(OH)_(16)CO_3·4H_2O沉淀。无定形氢氧化铝及其转化形成的硬水铝石释放出来的Al(Ⅲ)不断向碱式碳酸铜扩散是形成Cu_6Al_2(OH)_(16)CO_3·4H_2O的主要原因。水相中残余铝浓度越低,溶液碱性越强,无定形氢氧化铝向Cu_6Al_2(OH)_(16)CO_3·4H_2O的转化速率越缓慢。The residual phenomenon water distribution system. The CBR reactor of aluminum-salt coagulants is commonly found in drinking was used to simulate water distribution system and the influence of residual aluminum concentration and pH value on the formation and transformation of aluminum scale on the surface of copper tube was investigated. Experimental results showed that reducing the residual aluminum concentration could effectively reduce the formation rate of aluminum scale, and the change of pH value had little effect on the formation rate of aluminum scale. Further study showed that aluminum deposition appeared in water distribution pipeline and the amorphous aluminium hydroxide was the major scale component after 10 days aging. In the system with pH at 7.0 and the residual aluminum concentration of greater than 0.2 mg/L, X-ray diffraction signal of Cu6Al2（OH）16CO3·4H2O was observed after 30 days aging. The AI（ Ⅲ ） released from amorphous aluminium hydroxide and diaspore were diffused to copper carbonate, which was the main reason for the formation of Cu6Al2（OH）16CO3·4H2O. The lower residual aluminum concentration and the more alkaline in the water phase was, the slower the transformation tale of the amorphous aluminum hydroxide to Cu6Al2（OH）16CO3·4H2O was.

关 键 词：给水管网 铜质管材 铝垢 无定形氢氧化铝 Cu6Al2(OH)16CO3·4H2O 

分 类 号：TU991[建筑科学—市政工程]