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开封郊区降氟改水工程管理与运转调查报告李世宏韦志马建设１材料与方法开封郊区地处豫东黄泛区，属硷性土壤，系饮水型氟病区。自１９８６年始建无塔自控式降氟自来水工程以来，共建改水工程５８处，由于部分工程较长时间中断供水，难以计算全年运转费用，故本次选择４７...
Investigation Report on Management and Operation of Fluoride-Reducing and Water-Reclamation Project in Suburbs of Kaifeng LI Shi-hong WEI Zhi-ma Construction 1 Materials and Methods The outskirts of Kaifeng are located in the yellow-pan-eastern part of eastern Henan Province and belong to alkaline soil. Since the construction of tower-free self-controlled fluoride-free tap water project in 1986, a total of 58 water diversion projects have been constructed. Due to the interruption of water supply for some projects over a long period of time, it is difficult to calculate the annual operating costs.