Investigation of Physical Filteration and Hydraulic Performance of Geotextile Filters under Wastewater application

The aim of this study was to investigate the feasibility of the use of geotextile filters to decrease suspended materials of wastewater to use in trickle irrigation systems to perform the experiment¡ a metal box was designed and made. Experimental treatments included four wastewater heads which were continued until clogging occurred. Outflow index¡ wastewater heads between geotextile layers¡ influent and effluent TSS (Total Suspended Solids) from filtration system were measured at specific times. The results showed that clogging rate of geotextile filters depends on physical and biological parameters. Furthermore¡ these results indicate that flow rate variation and wastewater head loss were the same while passing the geotextile layers and was independent of the clogging factor. However¡ the clogging time was related to the parameters of the swage quality. The flow rate trend variation versus time was linear with dramatic change at the beginning of experiment. However¡ after a while¡ it became logarithmic and slow. The decrease in flow rate for the 70-cm height of wastewater head was 8.83 lit/s/m until 27 mintutes of the beginning of the experiment and 3.47 lit/s/m at 56 mintutes of the end of experiment¡ respectively. In this study¡ some equations were developed to model the flow rate and wastewater head loss (RMSE= 9.6%¡ R2=0.86)¡ clogging of the filtration system and wastewater head loss (R2=0.968 RMSE=0.773Lit/s/m). Our results confirmed the accuracy of the models.