Biocombi Compact Plants

for wastewater treatment of small communities

Highly efficient biological oxidation and depth filtration: these two steps are integrated in Biocombi, a compact plant for wastewater treatment in small communities, i.e., small towns or hamlets, resorts, hotels. Small footprint, flexibility for sudden changes in hydraulic and/or organic load, minimal energy use.

Integrated solution.

Integrated solution. Ideal for complete wastewater treatment (biological treatment and sludge separation) in small communities.

Minimal energy use.

Minimal energy use. This is used only for the operation of the biodisc motor and for cloth backwashing.

Minimum lifecycle cost.

Minimum lifecycle cost. Low acquisition, maintenance and resource utilization costs result in an excellent return on investment.

Minimal footprint.

Minimal footprint. Compact solution, reduced need for ancillary works.

Flexibility with load variations.

Flexibility with load variations. Reduced sensitivity to hydraulic and/or organic load changes.

Quick installation and start-up.

Quick installation and start-up. Pre-assembled plants, ready to run, complete with switchboard on board the machine.

Biocombi compact wastewater treatment plants: description and operation

For wastewater treatment of small communities, downstream of pre-treatment and primary settling, integrated systems come into play to group the purification processes into a single efficient and space-saving system: these are the Biocombi compact plants proposed by MITA Water Technologies.

In these systems, biological treatment is carried out by means of parallel polypropylene disks, mounted on a central axis and partially submerged, on which the biomass of aerobic bacteria is formed: these feed on the colloidal and dissolved substances, according to the principle of Biorulli® biodiscs, and carry out the oxidation and biodegradation of the pollutant. In the continuation of the process, one or more drum filters accomplish the separation of the secondary sludge, more effectively replacing the secondary sedimentation basin and ensuring a high quality of the effluent even in case of variable loading (both hydraulic and in terms of suspended particles): this is due to the free-fiber cloth, equipped with countless overlapping fibers, for depth filtration.

How does the backwashing of the cloth take place? Exactly as in the case of conventional MITA cloth filters: when the surface of the drum (or two drums) becomes covered with a layer of sludge such that it causes the pressure drop to increase to a target value, a level sensor starts a pump. This, through a suction unit arranged in contact with the drum, draws in the water needed to clean the cloth itself. The sludge removed with the water is sent to the primary settling tank, if any, or to another destination.Traditional MITA cloth filters: when the surface of the drum (or two drums) becomes covered with a layer of sludge such that it causes the pressure drop to increase to a target value, a level sensor starts a pump. This, through a suction unit arranged in contact with the drum, draws in the water needed to clean the cloth itself. The sludge removed with the water is sent to the primary settling tank, if one exists, or to another destination.

The most obvious advantages of the system are:

  • the minimal use of electricity,
  • maintenance limited to a few simple operations (executable by unskilled personnel),
  • small size,
  • constant performance even under varying loads
  • and last but not least, absence of noise and unpleasant fumes.

Biocombi compact systems are particularly suitable for small municipalities or hamlets, tourist resorts, hotels. Rated capacity: from 100 AE to 800 AE.

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    Small communities

    The optimal range for the use of Biocombi in municipal discharges is between 50 and 1,500 population equivalents. In communities with high tourist fluctuation, low energy availability, shortage of personnel, possibility of future upgrades, proximity of the plant to the population center, etc., this compact system offers definite advantages over other alternative biological sewage systems. Some examples?

    • Extraordinary ability to adapt to fluctuations, both in terms of flow rate and composition, of the sewage to be treated. In particular, when faced with underloads, the system reacts spontaneously without experiencing setbacks, unlike what can happen with plants with activated sludge technology.
    • Low installed power and low energy use.
    • Low maintenance and operating costs.
    • Possibility of plant growth as the population served increases; low noise and no aerosols.
    • High depuration rate.

    Resorts and campgrounds

    For this type of discharge, the plant is only operational for a few months of the year with an increasing inflow from June to August and decreasing inflow from August to September. The only biological treatment system that, sized for maximum capacity, can operate under all conditions and without corrective action is certainly the biodisc system. Combined with a cloth filtration section, the compact Biocombi system provides complete purification treatment with reduced space requirements and high purification efficiencies. In addition to this, it is essential to have a process that is triggered in the shortest possible time at the influx of the first users or, even, service personnel before opening.

    Construction sites

    These waters can be traced in terms of their characteristics to those of discharges from small communities. Biocombi find an optimal field of use especially in light of the fact that they are one-piece in size, thus allowing easy transportability, quick start-up and enabling the plant to be moved several times where wastewater treatment is needed. At the same time, the performance is absolutely comparable to a complete wastewater treatment plant. In this area, the combination of biodiscs and cloth filter offers the undoubted advantage of simplicity of adaptation to the various types of the discharge in terms of quality and quantity. The advantages of Biocombi also always include the minimal space occupied and ease of handling even by unskilled personnel.

    Hotels

    Due to their nature as a compact system, Biocombi, like biodiscs, can be applied to hotel facilities with both seasonal and annual operations. The characteristics of Biocombi respond very effectively to the needs of the industry. In fact, it is always advisable to have plants that are ductile under all load conditions, both hydraulic and biological, and with the least possible manpower for maintenance and operation. Compared with other biological purification alternatives, the proposed system is less noisy and, because it is compact and can be enclosed within a building, has a better environmental impact. Finally, cloth filtration, placed in place of secondary sedimentation, ensures excellent results in terms of wastewater quality, resulting in guaranteed compliance with legal limits.

    Schools

    Treatment with compact Biocombi plants is proposed in this context because of its ease of operation and control in situations where personnel are scarce and unskilled. The flow rate obviously needs to be equalized as water is discharged for only a few hours a day. Unlike other biological processes, Biocombi systems do not suffer even if they are not fed for long periods (weekends, summer shutdown, etc.). To complete the system, it is sufficient to provide good pretreatment (primary sedimentation, fine screening or similar systems) upstream of the equipment.

    Highway service areas

    This is one of the applications for which MITA Water Technologies has performed the largest number of machine installations over the years. In fact, one of the most important features of biodisc systems is the extraordinary ability of the system to adapt to fluctuations, both in terms of flow rate and composition of the sewage to be treated, which are often very large in discharges from a service area. In particular, in the face of underloads, the system reacts spontaneously without backlash. In contrast, in plants previously designed and built with activated sludge technology, the shortage of organic matter that occurs in the face of underloads caused the process to stall. An additional advantage offered by the compact Biocombi system is the low maintenance and control required by service area operators. Finally, the compactness of the system, its scalability, and cloth filtration instead of traditional sedimentation make it ideal for this type of installation.

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