滑县改水降氟打井工程水氟含量的调查

Investigation into water fluoride concentration and application of the fluoride-lowering well-digging projects in Huaxian

目的 了解滑县降氟改水工程水氟含量和工程使用情况。方法 对该县已建的 2 2 6处降氟改水打井工程全部进行调查。结果 正常使用的工程有 184处 ,占 81.4% ;停止使用 1年以上的工程 42处 ,占 18.6% ,造成工程停用的主要原因为水井喷沙、管道损坏和管理不善。对 184处正常使用的改水工程进行水氟含量测定 ,水氟超标工程 3 2处 ,占 17.4%。 40m以内和 41～ 60 ,61～ 99,10 0m以上的不同井深工程水氟含量超标率依次递减 ,分别为 41.47% ,15 .5 % ,6.5 %和 0 ;3 2处水氟超标工程均为水泥管井壁 ,而该县的 8处钢管井壁工程均未出现水氟超标。结论 改水降氟打井工程水氟含量与井深的高度两者之间呈负相关 ;

Objective To understand water fluoride concentration and application of the fluoride lowering well digging projects in Huaxian County.Methods Surveying all the projects in Huaxian County.Results There are total of 226 projects surveyed,among which 42 projects have been stoped using for over 1 year,accounting for 18.6%.The main reasons of the stopping are project destruction,pipe line destruction and administration failure.There are 184 projects used,in which 32 projects have water fluoride concentration higher than 1.0 mg/L,accounting for 17.4%.The over standard rate gradually decrease with increase of well depth.That rate of well at the depth of 40 meters below,41～60,61～99 and 100 meters above is 41.47%,15.5%,6.5% and 0,respectively.The 32 projects that water fluoride concentration are over standard are made of cement pipe.Conclusions There is a high negative correlation between water fluoride level and well depth.The steel well wall can effectively prevent underground high fluoride water permeating through the well.