A Study of the Horizontal Roughing Filter Efficiency to Improve the Quality of Effluent from Boukan Polishing Pond Following Aerated Lagoons

The need to improve the quality of lagoon effluent is one of the environmental priorities for wastewater projects. Thus, the study objective was to investigate horizontal roughing filter (HRF) performance to improvement total suspended solides (TSS), chemical oxygen demand (COD), turbidity and fecal coliform in the effluent from polishing pond following aerated lagoons in order to provide national standards.
The pilot-scale experimental study was carried out on-site wastewater treatment plant of Boukan, Iran. Design, manufacture and installation of horizontal roughing filter pilot was performed according to Wegelin guidelines. HRF Performance for removal of TSS, COD, turbidity and fecal Coliform was studied in three filtration rates 0.5, 1 and 1.5 m3/m2.hr. The results were analyzed by analysis of covariance (ANCOVA) using SPSS 16.
Findings: The mean of TSS, COD, turbidity and fecal coliform in the horizontal roughing filter effluent had the significant difference within various hydroulic loading rates (P The HRF can be used as appropriate option, due to high efficiency and easy operation, to improve the quality of effluent from the polishing pond following aerated lagoons in order to provide national standards.