改良型土壤渗滤系统处理生活污水脱氮除磷

NITROGEN AND PHOSPHORUS REMOVAL OF DOMESTIC SEWAGE TREATED BY MODIFIED SOIL INFILTRATION SYSTEM

为了研究土壤渗滤系统的净化效果,采用微纳米曝气预处理+土壤渗滤组合工艺处理模拟生活污水,考察其对脱氮除磷过程的影响。试验在2个尺寸均为300 mm×2 400 mm的有机玻璃柱R1、R2内开展,在R2反应器前设置微纳米曝气对进水做预处理。试验结果表明:在水力负荷为4 L/d的条件下,前置微纳米曝气改良型土壤渗滤系统处理生活污水取得了良好的处理效果,R2对化学需氧量(COD)、氨氮(NH_4^+-N)、总氮(TN)和总磷(TP)的平均去除率分别可达83.7%、96.5%、66.4%和92.6%,优于R1的去除效率。微生物学试验证明:2个系统中均存在厌氧氨氧化细菌,且在土壤表层以下0~30 cm处硝化-反硝化及厌氧氨氧化等脱氮反应阶段最为剧烈。前置微纳米曝气改良型土壤渗滤系统克服了传统土壤渗滤系统易堵塞、处理负荷低、脱氮效果差等缺点,对于农村生活污水治理具有推广应用价值。

In order to study the purifying effect of soil filtration system,the micro-nano aeration pretreatment and soil infiltration process were used to treat simulated domestic sewage,and its effect on nitrogen and phosphorus removal process was studied. The experiment was carried out in two organic glass columns R1 and R2 with dimensions of 300 mm ×2 400 mm,and the micro-nano aeration was set before the R2 reactor to do pretreatment of inflow. The results showed that under the condition of hydraulic load of 4 L/d,a good effect was reached by the preposed micro-nano aeration improved soil infiltration system to treat the domestic sewage. By R2,the average removal rate of chemical oxygen demand（ COD）,ammonia nitrogen（ NH_4~＋-N）,total nitrogen（ TN） and total phosphorus（ TP） was 83. 7%,96. 5%,66. 4%,92. 6%,respectively,which was better than the removal efficiency of R1. Microbiological experiments showed that there were anammox bacteria in both systems,and nitrification-denitrification and anammox and other denitrification reaction were the most fierce at0 ~ 30 cm below the soil surface. The preposed micro-nano aeration improved soil infiltration system and overcomed the shortcomings of traditional soil filtration system,such as easy clogging,low processing load and poor denitrification effect,which had popularization and application value for rural domestic sewage treatment.