INFLUENCE OF THE BIOMASS CARRIER TYPE ON THE OXYGEN TRANSFER RATE OF THE MODIFIED SUBMERSIBLE ROTATING BIOFILTER

Abstract

The modifi ed submersible rotating biofi lter MSRB was developed and patented to improve the effi ciency and quality of treated wastewater from small sett lements in Syria by increasing the mass transfer rate and oxygen transfer rate of the drum-type rotating biofi lter without the need for additional aeration elements. The result of comparing the eff ect of two types of biomass carrier on the oxygen transfer rate OTR shows that the highest value of the OTR when using the fi rst biomass carrier (1) was 409 g/m3·h with a drum fi lling percentage of 60%, a rotation speed of 15 rpm and an immersion depth of 35% While the maximum value when using the second biomass carrier (2) was 518.95 g/m3·h with a drum fi lling percentage of 90%, a rotation speed of 15 rpm and an immersion depth of 15%. It can also be concluded that a change in the shape of the biomass carrier, as well as its density, signifi cantly aff ects the OTR of the biofi lter. In addition, changing the shape of the biomass carrier requires changing other technological parameters, such as the fi lling percentage of the drum, the depth of immersion and the rotation speed.