Small=scale biological sewage treatment - with buffer basin, trickling bed filter and automatic recycling control

摘要

A biological small-scale trickling filter bed plant for domestic sewage consists of a buffer basin upstream and two clarification basins downstream of the filter. Recycling of part of the outflow is automatically controlled by a float valve on the buffer basin. Adjustable orifices control the outflow of filter and second clarification basin. Such a plant is suitable for compensating for the non-uniform rate of sewage input. It requires only one pipe for the effluent leading to the seepage disposal area. The benefits of biological purificn. are thus available for smaller housing estates.