地埋式砂滤系统及其环境意义

地埋式砂滤系统是一种新的生活污水处理技术 ,主要由预处理单元、布水系统和砂滤3部分组成。其原理主要是通过包气带中的生物降解、吸附、沉淀、过滤等机理净化污水。大量资料表明 ,地埋式砂滤系统不仅具有简单、可靠、低能耗、低建设费用、易操作等特点 ,而且其处理效果好、水力负荷高、占地面积小、对地表环境影响小等 ,是处理小流量生活污水的有效途径。加强地埋式砂滤系统的研究和应用 ,对环境保护和污水资源化均有重大的现实意义。

BURIED SAND-FILTER SYSTEM AND ITS ENVIRONMENTAL SIGNIFICANCE

Buried sand-filter system has been investigated in pilot and full scale as new on-site treatment technique for small household wastewater in many countries. It includes three basic components: pretreatment, distribution and sand filter units. The purification of wastewater is mainly achieved by biodegradation, absorption, precipitation and infiltration in an unsaturated aerobic environment. It is apparent that the system not only has the characters of simple, reliable, low energy consuming, low-cost constructing and easy to operate but also offers several advantages for the treatment of small wastewater flows. It shows excellent performance in most cases, the effluent quality is good, the demand of area is lower, the hydraulic loading is relatively high and influence on land surface environment is lower. Buried sand-filter system is the best way to treat small household wastewater. The study of the system is significant both for the protecting of environment and the reusing of wastewater.