The MBBR system is considered a biofilm process. Other conventional biofilm processes for wastewater treatment are calledtrickling filter,rotating biological contactor (RBC)and biological aerated filter (BAF). Biofilm processes in general require less space thanactivated sludgesystems because the biomass is more concentrated, and the efficiency of the system is less dependent on the final sludge separation. A disadvantage with other biofilm processes is that they experiencebiocloggingand build-up of headloss.
MBBR systems don't need a recycling of the sludge, which is the case with activated sludge systems.
The MBBR system is often installed as a retrofit of existing activated sludge tanks to increase the capacity of the existing system. The degree of filling of carriers can be adapted to the specific situation and the desired capacity. Thus an existing treatment plant can increase its capacity without increasing the footprint by constructing new tanks.
When constructing the filling degree can be set to, for example, 40% in the beginning, and later be increased to 70% by filling more carriers. Examples of situations can be population increase in a city for a municipal wastewater treatment plant or increased wastewater production from an industrial factory.
Some other advantages compared to activated sludge systems are:
This type of plants is used for treatment of ground water and surface water typically for reduction of iron, arsenic, fluoride, manganese, ammonium, and aggressivity in waterworks, companies, and private households.
Pressure filter plants can also be used for special fields of application such as dechlorination of water, reuse of process water, filtration of seawater, percolate filtration, final filtration of industrial or municipal waste water.Advantages
The flexible system with many standard modules results in favourable prices and makes countless applications possible. The plants are uncomplicated and at the same time extremely efficient and reliable. The design makes installation and maintenance relatively easy.
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