ADVANCED WASTEWATER TREATMENT BY HYDRAULIC AUTOMATIC FLOATING MEDIA FILTER (FILTRATION VELOCITY OF 7.5 M/H)

Abstract

A pilot scale experiment was carried out in tertiary wastewater treatment
using hydraulic automatic floating filter. Polystyrene with effective diameter De =
1.22 mm, coefficient of heterogeneity Kd (d80/d10) = 1.38, density of the
polystirene floating filter media 45 kg/m3 and porosity 40% was used in a filter
pilot as floating media. The hydraulic automatic floating media filter has been
working with 120 cm depth polystirene bed. Wastewater from secondary biological
treatment were treated in pilot filter with filtration velocity of 7.5 m/h. The
oxygen concentration was remain constantly at level 2.0 mg/l thank to ejector.
Headloss development and effluent water quality during filtration were studied.
With fitration cycle of 62.5 hours, headloss rate of 1.84 cm per hour, and
backwashing rate of 10-12 l/s/m2. The effects of treatment in SS, COD, BOD5, NH4+
and total Nitrogen were 58.1%, 65.1%, 66.9%, 73.6%and 45.5% respectively.