不同材质水窖储水水质及其变化规律实验研究

为研究不同水窖窖体材质对储水水质净化效果及其雨水水质自净规律的影响,合理选择水窖窖体材料,实验研究了在红粘土、水泥、混合材质模拟水窖中,贮存雨水水质指标pH、DO、CODMn、细菌总数随时间变化的规律。结果表明:红粘土水窖的水体自净作用较强,耗氧速率常数K红粘土﹥K混合材料﹥K水泥;随窖水自净作用的进行,CODMn和细菌总数先增大后缓慢降低,最后趋于某一常数,DO变化近似氧垂曲线;CODMn降解速率与其浓度呈一级反应关系;红粘土、水泥和混合材质水窖自雨水贮存120天后,在监测指标中,细菌总数分别下降了98%、65%、67%,CODMn分别下降了58%、34%、46%。红粘土水窖对有机物自然降解和微生物数量控制方面均优于其它水窖,推荐因地制宜,就地取材,采用红粘土作为窖体材料。

The variation of rainwater quality storing in water cellars made by different materials

In order to study the evolution of water quality storaging in the water cellar,to improve the quality of rainwater in it and then choose a reasonable materials of water cellar,we reseached the variation law of some index in different materials simulation cellars over time.The results showed with the proceeding of rainwater self-purification in the cellar,CODMn and the total number of bacteria increased firstly and then slowly lowered and kept invariant by the end,the change of DO approximated to the oxygen sag curve;The degradation rate of CODMn showed a first order reaction with it’s concentration.The self-purification capacity of water in the red clay cellar was the strongest.The DO-consumption rate constant of redclay was the bigest.After the rainwater storeing by 120 days in redclay,cement,and mixed materials celler,the total number of bacteria decreased by 98%,65%,67%,CODMn decreased by 58%,34%,46% in the monitoring indicators.Natural degradation capacity and inhibiting capacity toward microorganism of the red clay cellar was superior to the other cellars.