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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。
In order to study the effect of different cellars on the purifying effect of water quality and the self-purification of rainwater quality, a reasonable selection of cellar material was carried out to study the effect of storing water quality of rainwater in a simulated cellar of red clay, cement and mixed materials Indicators pH, DO, CODMn, the total number of bacteria over time changes. The results showed that the water body of the red clay cellar had a strong self-purification effect, and the oxygen consumption rate constant K red clay> K mixed material> K cement. With the self-purification of cellar water, the CODMn and bacteria numbers firstly increased and then slowly decreased, At certain constant, the change of DO is similar to that of oxygen drop curve; the degradation rate of CODMn is in a first-order relationship with its concentration; in the monitoring index, the total number of bacteria in red clay, cement and mixed material cellars decreased by 98% , 65%, 67%, CODMn decreased by 58%, 34%, 46% respectively. Red clay water cellars are better than other cisterns on the natural degradation of organic matter and the control of the number of microorganisms. It is recommended to use local materials and red clay as cellar material according to local conditions.