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
98120
MBBR
Partial conversion of the biological activated sludge plant into the MBBR plant, by replacing the air diffusion network, upgrading the blowers and inserting the carriers in the tank. The intervention allowed compliance with the discharge limits in the public sewer, despite the increase in the load of pollutants in the waste water.
Textile industry
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
86919
MBBR
The existing treatment plant, essentially consisting of biological equalization and oxidation, was adapted with the insertion of the filling bodies by modifying the ventilation system and the management of the discharge. Final filtration was added with discs that receive the flow tangentially on the metal mesh with a light of a few microns, in order to separate the waste biomass from the waste water. The sludge accumulates in the thickener for periodic purging. The water falls back into the sewer passing through a flow meter.
Laundry sector
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
44517
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 for a significant reduction in the value of surfactants within the legal limits for discharge into the public sewer system.
Chemical sector
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)
19507
MBBR
Upgrading of the purifier serving the waste water of a pharmaceutical product synthesis plant (process water, scrubbing towers washing, filter washing, equipment reclamation, supernatants and various purges), with the installation of a biological oxidation system through the ” use of MBBR technology with carriers in the tank and the separation of biological sludge by lamellar decanters, after dosing of polyelectrolyte.
Chemical-Pharmaceutical Sector
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