الفهرس | Only 14 pages are availabe for public view |
Abstract Combined suspended / attached growth (CSAG) systems have been used recently to overcome some of the disadvantages of existing systems. It takes its importance from high biomass concentrations that can be achieved with, resulting in short hydraulic retention times (HRT) compared to suspended growth systems with equivalent solids retention times. The present study investigated the enhancement of conventional activated sludge (AS) process performance using attached media submerged in the aeration tank. The main purpose of this work is to find out the optimum combination of attached growth and suspended growth systems that achieve the best removal ratios (RR) of pollutants. Two models have been set up and run treating primary treated domestic wastewater. One of these two models has been run as an aeration tank without any submerged media. This model has been utilized as a reference for the other model that has been run as a combined suspended attached growth process. These two models worked parallel with the same influent wastewater and the same experimental conditions to investigate the effect of volume of submerged media added in the aeration tank, hydraulic retention time (HRT), and sludge retention time (SRT), on the removing BOD5, COD, and ammonia nitrogen. |