水面型湿地工艺设计方法研究

本文改进了美国水面型湿地工艺设计方法。以土壤生物活性取代生物体附着所需介质的比表面积(A_v),以坡长、投配速率与c_e/c_o值的函数关系为模型基础。当水力负荷小于4cm/d时,c_e/c_o值上升缓慢,大于4cm/d时,以指数形式上升。BOD值沿处理床长度方向以负指数形式变化。模型结果检验表明,理论计算值与全年实测值的平均相对误差为0.35％—13.86％,标准差为6.6％—14.57％。本文所提出设计方法比美国湿地工艺设计方法的平均相对误差减少33.51％—90.1％,标准差减少3.32％—37.87％。

Study on the Design Approach for Free-water Wet-land Technology

Modifications were made to the technological design method of the water-surface flow wetland by using soil biological activity rather than the specific surface area (AV) of the medium required for the attachment of organisms and taking the functional relationship model of the slope length and applications rate with Ce/Co ration as the basis. Ce/Co ration increases slowly when the hydraulic loading rate is less than 4cm/d and increases exponentially when the hydraulic loading rate is over 4cm/d. BOD5 values change in the form of ne-gative exponent along the length direction of the land. The examinations of the modeling results indicate that the average relative error of the theoretical calculation values and the practical yearly-measured results is from 0.35% to 13.86% with the standard deviation from 6.6% to 14.57%. The average relative error and standard deviation of the present design method decreased by 33.51-90.10% and 3.32-37.87% respectively compared with the American design method for wetland systems.