Development of soil-covered SBR process for small scale sewage treatment.

Nitrogen and phosphorus compounds, mainly from the households in residential areas are responsible for eutrophication occurring in lakes or estuaries. In Korea, there is a growing trend for villages in the countryside, rest areas of express ways, military unit bases, etc. to use small scale sewage treatment plants (SSTPs). However, the technological developments have mainly focused on medium or large scale sewage treatment plants, leaving a gap in the development of technologies for SSTPs without a residing operator. In this study, a soil-covered sequencing batch reactor (SBR) process for SSTPs in combination with a natural purification technology is developed to remove nitrogen and phosphorus as well as organic contamination (BOD), and the results are as follows: (1) the removal rates of BOD, total nitrogen (T-N), total phosphorus (T-P) and suspended solids (SS) are 93%, 74%, 80% and 95%, respectively, (2) the soil-covered SBR process without the decanter used for effluent discharge is similar to other SBR processes in suspended solids removal rate, and (3) the performance of the field pilot plant was monitored by remote sensing system in real time, and the results show that this system can be applied to SSTPs with no residing operators.