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Xiaojian Zhang Zilong Mi Yang Wang Shuming Liu Zhangbin Niu Pinpin Lu Jun Wang Junnong Gu Chao Chen 《Frontiers of Environmental Science & Engineering》2014,8(3):417-426
A red water phenomenon occurred in several communities few days after the change of water source in Beijing, China in 2008. In this study, the origin of this problem, the mechanism of iron release and various control measures were investigated. The results indicated that a significant increase in sulphate concentration as a result of the new water source was the cause of the red water phenomenon. The mechanism of iron release was found that the high-concentration sulphate in the new water source disrupted the stable shell of scale on the inner pipe and led to the release of iron compounds. Experiments showed that the iron release rate in the new source water within pipe section was over 11-fold higher than that occurring within the local source water. The recovery of tap water quality lasted several months despite ameliora- tive measures being implemented, including adding phosphate, reducing the overall proportion of the new water source, elevating the pH and alkalinity, and utilizing free chlorine as a disinfectant instead of chloramine. Adding phosphate was more effective and more practical than the other measures. The iron release rate was decreased after the addition of 1.5 mg. L-1 orthophosphate- P, tripolyphosphate-P and hexametaphosphate-P by 68%, 83% and 87%, respectively. Elevating the pH and alkalinity also reduced the iron release rate by 50%. However, the iron release rate did not decreased after replacing chloramine by 0.5-0.8 mg. L-1 of free chlorine as disinfectant. 相似文献
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郭民生 《资源节约和综合利用》2011,(1):26-27
案例导读:李官奇,河南滑县农民发明家,第八届中国专利金奖获得者,2004年度大河财经人物,河南省首届“十大非职务发明创业之星”。先后以其十多项发明专利和“李官奇”、“天绒”、“沅秀”商标等知识产权为智力资本,以技术入股的方式,合资兴建了数家生产企业。在这些合资项目中, 相似文献
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《资源节约和综合利用》2011,(12):6-6
由计世传媒集团和计世网联合主办的“2011年中国IT两会”12月1日在成都开幕。工业和信息化部副部长杨学山出席了会议,并就中国当前和未来一个阶段推进信息化的想法谈三点意见:要求整个信息化产业要把握趋势,明确方向;把握需求,明确目标;把握实际,寻找路径。 相似文献