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《给水排水》1980年第2期刊登了“曝气-石英砂过滤法除铁的调研和试验”一文,现对该文论述的问题,提供一些情况,供讨论。一、关于“第二种水”的分布范围文中提及福建九龙江畔一带井水都属于“第二种水”(即除铁困难的水),实际情况并不完全如此。例如福建郭坑铁路给水所大口井水源位于九龙江东岸的沙滩中,1975年4月经有关单位测定,原水曝气前后的水质为:
“Water Supply and Drainage” published in the second issue of the “Aeration-quartz sand filtration method for iron removal research and trials” article in 1980, now provides some information for the discussion of this article for discussion. I. About the distribution scope of the “second water” The text mentions that the well water in the area along the bank of the Jiulong River in Fujian Province belongs to the “second water” (ie, water with difficult iron removal). The actual situation is not entirely the same. For example, the water source for the large wellhead of the Guokeng Railway Feedwater Station in Fujian Province is located on the beach on the east bank of the Jiulong River. It was determined by the relevant units in April 1975 that the water quality before and after the raw water aeration was: