Abstract:

Based on the ecological environmental statistics and monitoring datas of municipal wastewater treatment plants in China， the empirical sludge yield coefficient（Y _Q） and the sludge yield coefficient（Y _COD） calculated based on the sludge proliferation caused by the removal of COD in municipal wastewater treatment plants in China were analyzed，and the response relationships between single factor such as influent COD，design treatment scale，treatment process，regional distribution and sludge yield coefficient，as well as response relationships between multiple factors and sludge yield coefficient were studied. The results showed that the average of Y _Q of municipal wastewater treatment plants in China was 1.33×10^-4 t/m³ and the average of Y _COD was 0.81 kg/kg. Y _Q and Y _COD showed positive skewed distribution in general. The average of Y _Q was positively correlated with COD in influent and design treatment scale，meanwhile the average of Y _COD was negatively correlated with COD in influent and design treatment scale. The COD range corresponding to the average values of Y _Q and Y _COD was 150-250 mg/L. Y _Q and Y _COD for wastewater treatment plants with design treatment scale of 1×10⁴-1×10⁵ m³/d were the closest to the overall national average，with relative deviations of 2.8% and -4.3% respectively. Y _Q and Y _COD of A²/O process，oxidation ditch type，ordinary activated sludge method and A/O process were close to the overall national average，with relative deviations ranging from -1.8%-1.9% and -2.3%-5.8% respectively. Y _Q of East China and Central China，Y _COD of East China and Southwest China were basically the same as the national average. The COD in influent was the most significant influencing factor for Y _Q and Y _COD through using multifactor analysis of variance.

Key words: municipal wastewater treatment plants, sludge yield coefficient, influencing factor, multifactor analysis of variance

摘要：

以我国城镇污水处理厂生态环境统计和监测数据为基础，分析了我国城镇污水处理厂经验污泥产率系数（Y _Q）和以去除COD导致的污泥增殖来计算的污泥产率系数（Y _COD），研究了进水COD、设计处理规模、处理工艺、区域分布等单一因素以及多因素与污泥产率系数的响应关系。结果表明，我国城镇污水处理厂Y _Q平均值为1.33×10^-4 t/m³，Y _COD平均值为0.81 kg/kg，Y _Q、Y _COD总体呈正偏态分布；Y _Q平均值与进水COD、设计处理规模正相关，Y _COD平均值与进水COD、设计处理规模负相关；Y _Q 、Y _COD平均值对应的COD区间范围为150~250 mg/L，设计处理规模为1×10⁴~1×10⁵ m³/d的污水处理厂Y _Q、Y _COD与平均值最为接近，相对偏差分别为2.8%、-4.3%；A²/O工艺、氧化沟类、普通活性污泥法、A/O工艺的Y _Q 、Y _COD与平均值接近，相对偏差范围分别为-1.8%~1.9%、-2.3%~5.8%；华东和华中地区的Y _Q，华东、西南地区Y _COD与平均值基本持平；多因素方差分析显示进水COD为Y _Q和Y _COD的显著影响因素。

关键词: 城镇污水处理厂, 污泥产率系数, 影响因素, 多因素方差分析

CLC Number: 

• X708