水解/跌水曝气/快渗工艺处理山地城镇生活污水

为了探讨适用于三峡库区山地小城镇污水处理的工艺,结合山地小城镇具有较大自然地形高差和较多荒地荒沟的特点,采用"厌氧水解/自然跌水曝气/改良人工土快渗系统"组合工艺建设生活污水处理示范工程。分析了该示范工程对主要污染物的去除效果,考察了温度和进水负荷对去除污染物的影响,并进行了经济分析。结果表明,该组合工艺具有较强的抗冲击负荷能力和较好的污染物去除效果;系统对COD和NH4+-N的去除效果与温度显著相关,而对TP的去除效果受温度的影响较小;各污染物的单位面积去除负荷与进水负荷近似服从对数关系;该组合工艺的基建费用较之常用污水处理工艺减少20%～50%,运行成本仅为0.29元/m3。

Anaerobic Hydrolysis/Waterfall Aeration/Rapid Infiltration Process for Treatment of Domestic Sewage in Mountain Towns

In order to seek for the sewage treatment processes fitting for small mountain towns in the Three Gorges Reservoir Region,a demonstration project of domestic sewage treatment using the combined process of anaerobic hydrolysis,natural waterfall aeration and improved artificial soil rapid infiltration was built based on the features of large terrain elevation and many barren ravines.The removal efficiencies of major pollutants in the combined process were analyzed.The impact of temperature and influent loadings on removal of pollutants was discussed,and the economic benefit was also investigated in the demonstration project.The combined process had a strong resistance to the influent loadings with high removal efficiencies of pollutants.There was a significant correlation between temperature and the removal efficiencies of COD and NH+4-N in the system,while the removal efficiency of TP was not associated with temperature.There was an approximate logarithmic relationship between the pollutant removal loadings per unit area and the influent loadings.The construction cost of the combined process was reduced by 20% to 50% compared with conventional sewage treatment processes.The operation cost was 0.29 yuan/m3.