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针对城市多水源切换供水可能引发的管网“黄水”现象,以通水水源分别为地表水和地下水的铸铁管道搭建两套中试系统,开展了正磷酸盐、聚磷酸盐和硅酸盐缓蚀剂复配投加方式对给水管网铁释放控制的试验研究。结果表明,原通地表水的管道对水源切换有较强的适应性,而原通地下水的管道受水源切换的影响较为明显,表现为铁释放量较大,总铁含量超标。以一定比例复配的缓蚀剂投加初期对原通地下水的管道铁释放有促进作用,对原通地表水的管道影响较小;但随着缓蚀剂中硅酸盐所占比例的减小,铁释放现象逐渐得到抑制。停止投加缓蚀剂后两套系统铁释放比未投加之前明显下降,降幅分别为51%和57%,出水总铁均达标。缓蚀剂的投加对铝、锰和铬微量金属元素的释放具有一定的抑制作用,而对铜、锌、镍、砷等的释放影响不大。
In view of the phenomenon of pipe network “yellow water ” which is caused by the switch of water supply in urban areas with multiple sources of water, two pilot systems were set up with cast iron pipes for surface water and groundwater, respectively, through water sources. Orthophosphates, polyphosphates and silicon Experimental Study on Iron Release Controlled by Acidic Inhibitor Compounding and Adding Method to Water Supply. The results show that the original surface water pipelines have strong adaptability to the water source switchover, while the pipelines of the original groundwater passage are more obviously affected by the water source switchover, which shows that the release of iron is large and the total iron content exceeds the standard. In the early stage of compounding, a certain proportion of corrosion inhibitors added to the pipeline could promote the release of iron in the pipeline, but had little effect on the pipeline of the surface water. However, with the decrease of the proportion of silicate in the corrosion inhibitor Small, iron release gradually suppressed. After stopping the dosage of corrosion inhibitor, the release of iron in the two systems decreased significantly compared with that before the dosing, with the decrease of 51% and 57%, respectively. The total iron effluent reached the standard. The addition of corrosion inhibitor has a certain inhibitory effect on the release of trace metals of aluminum, manganese and chromium, but little effect on the release of copper, zinc, nickel and arsenic.