曝气充氧条件下受污染河道的水质模型建立及应用

Water Quality Model and Its Application in Polluted River Remediation by Aeration

曝气充氧技术是修复受污染河道的主要方法之一.以曝气充氧方法治理修复受污染的上海市新港河道为例,通过理论分析建立了受污染河道的水质模型,确定了模型中参数的识别求解方法,并以实测值与模拟计算结果进行对照.结果表明,溶解氧的平均相对误差为11.38%,其中相对误差低于20%的占83.3%;生化需氧量的平均相对误差为9.16%,其中相对误差低于20%的占91.7%;氨氮的平均相对误差为11.15%,其中相对误差低于20%的占91.7%,除个别点的相对误差较大以外,其余均在20%以内.表明该模型能较好地反映在曝气充氧条件下新港河道水质的实际状况;同时,应用该模型模拟分析了曝气量、流速和底泥悬浮、温度对河道水质的影响,为曝气充氧修复受污染河道的工程设计及运行提供了理论计算方法及依据.

Aeration is a main method to remediate polluted river water.Based on Shanghai Xingang River＇s aeration remediation,theoretical polluted water quality model was built.At the same time, parameters identification and solution were defined.Compared with observation values,the results from the model showed that： the dissolved oxygen had an average relative error of 11.38%,of which the relative error less than 20% accounted for 83.3%;BOD5 had an average relative error of 9.16%,of which the relative error less than 20% accounted for 91.7%;ammonia had an average relative error of 11.15%,of which the relative error less than 20% accounted for 91.7%.With the exception of the individual points,most of the values from this model had relative error less than 20%.This model could describe well Xingang River＇s water quality under aeration conditions.Aeration intensity,velocity,sediment suspension and temperature simulation were analyzed by this model,which provides theoretical calculation methods and the basis for engineering design and operation of polluted river aeration remediation.