Technology Description:

The technology is a combination of two others (MBBR and MBR) where most of the required microorganisms grow on the specific biocarriers as a biofilm (as in MBBR) and the excess biological film coagulates into flocs in the aeration tank before its retention by porous membranes (as in the case of the membrane bioreactor).

The biocarriers are retained in the bioreactors using special grates while the last department before the membranes (separation of mixed liquid) is the flocculation zone for the biofilm to create the flocs and be retained by the membranes downstream.

Basic design and operational parameters :

Typical biomass concentration in bioreactor0,25-0,5 kg/m31,5 – 3,0 kg/m3
Typical SVI50ml/gr
Typical value of max hydraulic surface load of sedimentation tank1,8m/hr
Biomass retention in the systemVia biocarriersVia biocarriers


    • Significant reduction of generated waste sludge
    • Waste sludge with higher settle ability index
    • Smaller footprint
    • Reduced quantity of sludge for disposal => reduced operational costs
    • Elimination of sludge settleability problems (sludge bulking)
    • No sludge recirculation required => reduction of investment and operational costs
    • Better effluent quality, close to tertiary treatment
    • Partial disinfection, due to retention of pathogens from membranes

MESOGEOS applies the MBMR method to:

    • Construction of new wastewater treatment plants with reduced available area, high-quality effluent requirements
    • Extensions of existing wastewater treatment plants with limited area and high quality effluent requirements

Case Study


A recent application of the method by MESOGEOS SA is the Simantra WWTP Nea Propontida, Halkidiki, which is a treatment facility with a capacity of 4,500 pe.More specifically, the project includes:

    • Compact pretreatment unit
    • Equalization tank and pumping station feeding biological stage
    • Four independent compact MBMR. type biological treatment units
    • Effluent chlorination – dechlorination and disposal

Project Data :

Budget2.805.679,86 incl VAT
InfluentMunicipal wastewater
Capacity4.500 pe
Capacity1.170 m3/day
Influent organic load270 kg BOD/day
230,8 mg/l
Effluent qualityBOD = 10 mg/l
TSS = 2 mg/l
TN = 10 mg/l
Waste sludge produced110 tn SS/year