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引用本文:徐毓荣,徐钟际,徐玮,向申,封珩.水温分层型水库铁、锰垂直分布特征.湖泊科学,1999,11(2):117-122. DOI:10.18307/1999.0205
XU Yu-rong,XU Zhong-ji,XU Wei,XIANG Sheng,FENG Heng.Characteristics of Fe, Mn Vertical Distribution in a Thermal Stratified Reservoir. J. Lake Sci.1999,11(2):117-122. DOI:10.18307/1999.0205
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水温分层型水库铁、锰垂直分布特征
徐毓荣, 徐钟际, 徐玮, 向申, 封珩
贵州省环境保护科学研究所, 贵阳 550002
摘要:
贵阳市主要饮用水源地阿哈水库系水温分层型季节性缺氧水库,由于沉积物含高浓度Fe,Mn,至使库水受到污染.经多年测定不同季节20m深垂直水柱结果表明,Fe,Mn分布随着季节变化、水库水温分层而变化,呈现明显的垂直分布规律,高浓度Fe,Mn主要出现在水温分层期水库中、下层,与库底缺氧、pH下降沉积物高浓度Fe,Mn释放造成的二次污染等密切相关,从而为自来水厂实施优化分层取水和污染控制提供了依据.
关键词:  水温分层  季节性缺氧  Fe  Mn  垂直分布  沉积物
DOI:10.18307/1999.0205
分类号:
基金项目:贵州省科委“八五”攻关课题专题
Characteristics of Fe, Mn Vertical Distribution in a Thermal Stratified Reservoir
XU Yu-rong, XU Zhong-ji, XU Wei, XIANG Sheng, FENG Heng
Environmental protection Institute of Guizou province, Guiyang 550002
Abstract:
Aha reservoir, 6 kilommters away from southwest Guiyang City, Guizhou Province, is major source for drinking water of Guiyang City. Normal stage of this reservoir is 1108. 0 m; reservoir capacity 44. 5 million m3; and the water depth 26m. The dead stage and reservoir capacity of dead water are 1090m and 2.7 million m3 respectively. As an artificial lake, seasonal oxygen shortage is one of vivid characteristics of Aha,reservoir polluted by waste water containing Fe, Mn from coal mine. Results from years measuring of vertical water column of 20m depth in different seasons show that Fe and Mn distributions vary with different seasons and different temperture strata of water, and the vertical water temperature is in isothermal status from winter to earlier stage of spring, during which concentration of Mn and Fe in water is less than 0. 01 mg·L-1 and 0.05 mg·L-1 respectively. During summer and autumn, reservoir will be stratified according to different temperatures. Upper stratum is in oxygen rich status, with Mn and Fe concentration of less than 0. 1 mg·L-1 and 0. 3 mg· L-1 respectively, and the middle and lower strata are in status of low pH, oxygen shortage or lower oxygen, at which, Fe concentration is more than 0. 3 mg·L-1 while Mn concentration is as high as 1.086 mg.L-1,which is indentified to be closely rele-vant to oxidation and reduction reaction of high concentration of Fe(166000 mg · L-1) and Mn (18800 mg·L-1) contained in the reservoir sediment. The study provides a guideline of pumping at the optimum depth according to the optimum qaulity of water for water plant.
Key words:  Fe  Mn  vertical distribution  thermal stratification  seasonal oxygen shortage  sediment
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