Waste water treatment using gravelgeo textile filter

Abstract

A Comparative study was carried out to assess the effectiveness of geotextile in gravelgeotextile filter in removing Total Suspended solid (TSS) and Biochemical Oxygen demand (BOD5) from municipal waste water and comparison was made with gravel-only filter & Gravel-PET filter with respect to TSS and BOD5 removal. The experiment was conducted by setting up three test filter columns at Concrete Pathology Lab, Metro car Depot Joka Kolkata and TSS & BOD5 values were obtained after testing inlet and outlet samples at School of Water Resources Engineering Laboratory, Jadavpur university, Kolkata. The waste water was collected from the municipal sewer nearby Metro car Depot Joka. The TSS removal efficiency of Gravel-geotextile filter was the highest with TSS removal up to 81.65 % of inlet value compared to other two filter test columns which managed to remove TSS up to 65 % and 69.75 % respectively. The BOD5 removal efficiency of Gravel-geotextile filter was also the highest with BOD5 removal up to 64 % of inlet value compared to other two test filter columns which managed to remove BOD5 up to 57.6 % and 49 % respectively. The Gravel-geotextile filter can be used for water treatment in small communities discharging low to medium strength sewage.