Modification on design equation of facultative stabilization ponds due to egyptian circumstances

Abstract

Stabilization ponds are established in various cities and villages in Egypt there are about 38 ponds covering almost all the regions of the country some of these ponds are working with low efficiency some of them are over designed and some are under designed One of the main problems is the plants are not fenced properly which maximize the wind effect and cause disturbance in the pond performance, some ponds are designed to receive a certain flow but actually it receives much less flow which increases the retention time. In this study, Eight working WSPs in different locations all over Egypt were monitored and their performances were evaluated with respect to ponds retention time and prevailing climate temperature, wind and humidity conditions. These locations had covered regions presented in (Al Beheira, Fayoum, New Valley, Luxor, Hurghada, Sharm El Sheikh, Areesh & Abu Rudies) Each location had been visited during season's winter, spring, summer & autumn to obtain the different weather conditions and several samples were collected during the day over three days in each season. It was found that reduced pond retention time could work perfectly with climate conditions in Egypt. Conclusions were drawn to suggest a modification on the design equation of the facultative stabilization ponds to meet Egyptian circumstances that minimize the required area for such technology in Egypt application.