.MBBR

Moving Bed Biofilm Reactor

In the area of aerobic activated sludge plants, we propose MBBR (Moving Bed Biofilm Reactor) type plants, characterised by the presence of filler bodies to which the biomass adheres. We generally envisage an oxidation section, where the growth of a biofilm on a substrate is the result of the interaction between biological processes and substrate transport processes. In particular, the formation of the biofilm is mainly due to the growth of microbial cells and the production of extracellular polymers, while the contribution of the solids present in suspension in the liquid phase outside the biofilm is generally quite negligible. Biofilm development will vary depending on the composition of the effluent and transport processes, on which the availability of substrates for the microorganisms within the biofilm depends. The phenomena of biofilm detachment are mainly related to the following contributions:

1.  Predation: by organisms such as protozoa or metazoa

2.  Shear actions: induced by water flow tangential to the biofilm can be reduced by protecting the biofilm, e.g. by corrugated surfaces

3.  Abrasion: this mechanism is important when the particles on which the biofilm is present are in free movement and subject to reciprocal impact

4.  Spontaneous detachment (collapse): this occurs randomly, e.g. when oxygen- and substrate-limiting conditions occur in the deep areas of the biofilm.

The use of MBBR (Moving Bed Biofilm Reactor) technology involves the presence of fillings inside the aeration tank, made of different types of synthetic material; these fillings are kept in suspension within the liquid mixture by means of insufflation-diffusion of compressed air (generated, for example, by a volumetric blower) through specific aeration/mixing systems with medium bubbles installed on the bottom of a biological tank. The objective of the MBBR technology is to improve the traditional activated sludge process through the adoption of a higher concentration of biomass in the aeration tank; it, therefore, offers the possibility of considerably reducing the required size of the basin, with the same applied load value. For these plants, if necessary, a separation section for total suspended solids TSS by means of disc filtration is foreseen.

Here below some of works

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26521

MBBR

Conversion of the existing equalization tanks into a real biological purification plant, with the installation of the air diffusion system and carriers in plastic material, to exploit the existing volumes and therefore avoiding further building works, thanks to the help of MBBR technology. The modification has allowed the substantial reduction in the value of pollutants within the legal limits for discharge into the public sewer system, avoiding the application of substantial costs for exceeding the discharge limits (granted in derogation by the managing body but with the application of tariffs costly and constantly increasing).

Textile industry

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15120

MBBR

Conversion of the existing equalization tanks into a real biological purification plant, with the installation of the air diffusion system and carriers in plastic material, to exploit the existing volumes and therefore avoiding further building works, thanks to the help of MBBR technology. The modification has allowed the substantial reduction in the value of pollutants within the legal limits for discharge into the public sewer system, avoiding the application of substantial costs for exceeding the discharge limits (granted in derogation by the managing body but with the application of tariffs costly and constantly increasing).

Textile industry

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68918

MBBR

Conversion of the existing equalization tanks into a real biological purification plant, with the installation of the air diffusion system and plastic carriers, to exploit the existing volumes and thus avoiding further building works, thanks to the help of MBBR technology. The modification allowed the discharge to the public sewer within the limits of the law.

Textile industry

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40510

MBBR

Removal of high concentrations of COD and Suspended Solids, thanks to the installation of a flotator downstream of the MBBR plant, which guarantees the elimination of problems related to the presence of light substances and the high load of organic matter typical of static settlers . The peculiarity of this new application was the resolution of one of the main problems of an MBBR system: the progressive decrease of the purification yield, due to the progressive clogging of the carriers which does not allow the intimate contact between the biofilm and the substances to be degraded as well as the oxygen dissolved in water. This phenomenon causes the progressive worsening of the characteristics of the wastewater at the final discharge. The problem was solved thanks to an innovative automatic and timed cleaning system of the carriers, thus guaranteeing the excellent purification yields of the MBBR system combined with flotation. In this phase there is an increase in the Suspended Solids exiting the oxidation tank, eliminated by the correct sizing of the flotator.

Chemical sector (hydrogenated fats)

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FIDIA ENGINEERING S.r.l.

Sede legale: Via Enrico Fermi 32 – 24020 Scanzorosciate (BG)

Sede operativa, magazzino e officina: Via A. Moro 1 – 24020 Scanzorosciate (BG)

Cap. Soc. € 500.000,00 i.v.

R.I. BG, Cod. Fisc. e P.I. 02887960165

Cod. Univoco SUBM70N

REA 331280

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+39 035.6594550

info@fidiaeng.it