Biofix 1k instruction


Wastewater treatment plant Bioclere Biofix-3K is designed for treating domestic wastewater from up to 5 people. The performance of the treatment plant is 1 m3/d, 0,1 m3/h. The permissible pollution load is 0,3 kgBOD7/d.

Treatment process: mechanical pre-treatment based on sedimentation technology in clarifier, biological treatment based on submersible biofilter technology with chemical phosphorus removal in final clarifier.

BioFix have CE-trademark:
International test index: SYKE-2004-A-3-A4/27
International test index: SYKE-2004-A-3-A4/28

Hydraulic load 1 m3/d
Pollution load 5 pe; 0,3 kgBOD7/d
Electrical requirements 230 V, 50 Hz
Installed capacity 1,1 kW
Energy consumption 1,7 kWh/d
Measurements PxLxH 2020 x 1200 x 2100 mm

Treatment efficienty:

COD, BOD, SS, Ptot: 90–99%
Ntot: 40–80%

Treatment plant must be installed and maintained in accordance with the installation and maintenance instructions for the equipment.

Technical scheme of BioFix-1K:



Manufactured in EU: Fixtec Ltd Noole 4-6B, 10415 Tallinn Estonia This email address is being protected from spambots. You need JavaScript enabled to view it. phone +372 6466305



Wastewater treatment plant Bioclere Biofix is designed for treating domestic or similar industrial wastewater. The treatment process comprises three stages – mechanical, biological and chemical (see treatment technology scheme). Mechanical treatment of wastewater is performed in a primary clarifier tank, biological in bioreactor and chemical treatments in final clarifier. The technology used in the biological treatment step (fixed film bioreactor) is one of the most up-to-date and ensures a high level of purity of wastewater. The location of the wastewater treatment plant is determined by the design solution; the wastewater treatment plant shall be accessible by a tank truck for sludge disposal. The treatment plant is designed to be installed underground. In transporting the biological treatment plant, mechanical damage must be avoided; the plant must be transported and lifted using the fixing ears on the plant’s case.


2. Excavation and foundation

The installation of the treatment plant must be based on the elevation marks and orientation presented in the design solution and/or the drawings of the treatment plant complex. The treatment plant is installed horizontally, and the upper rim of the treatment plant shall be higher than the surrounding ground by 10-15 cm to prevent storm water and soil water from entering into the biological treatment plant.

The treatment plant is installed in an excavation prepared for the purpose and provided with a base slab (recommended). The base slab must be provided with non-corrosive anchors to prevent it from rising due to the action of soil water, and immediately fixed in the desired position (the fastening straps must be tied to the ears on the case and anchored). The recommendable dimensions of the base slab are approximately 2200 x 1400 mm. Before backfilling the excavation the wastewater treatment plant must be filled with water. The excavation backfill material must be sand without stones. The excavation must be backfilled with sand by 20-cm layers, compacting each layer. The treatment plant must be insulated near ground level with insulation plates 50…100 mm arround the plant 2 m (on area of cold chlimat conditions). Alternatively the walls of the treatment plant must be insulated to the height of 120 cm from the ground around the entire perimeter of the plant to prevent it from freezing through. The pipes coming in and going out of the plant must also be insulated within the freezing horizon.

3. Primary clarifier and feeding pump

Mechanical pre-treatment of wastewater take place in primary clarifier tank of plant. Coarse waste and suspended solids are detained in the tank (sedimentation and sludge storage). Additionally primary clarifier tank include special screen on inlet of feeding pump chamber. Sludge from clarifier must be removed 2…4 time per year; use of the special biopreparation allows reducing this number 1…3 times per year. Sludge remove frequency depending on real load of plant.

Wastewater pumped from the primary clarifier tank to the bioreactor must previously be cleansed of solids to prevent the feeding pump from clogging and foreign bodies from entering into the bioreactor. Between primary clarifier and feeding pump chamber locating special screen (see technical scheme). A feeding pump provided with a level transmitter (float switch) is used to pump wastewater into the bioreactor. For that, the level transmitter must be fastened to the pressure hose or pump in such a way as to minimise its vertical movement range. In such a case the level transmitter is suspended at roughly the pump installation height – the pump would switch off. The pump must switch on when the water level rises by 15…30 cm. The small movement range of the level transmitter ensures short pumping cycles. The principle is that the pump must switch on frequently but for short cycles of operation. This ensures that wastewater enters the biological treatment plant more evenly and in smaller quantities. The pump must not be suspended on a cable or pressure hose but fixed using a waterproof suspension wire/rope.

Mechanical pre-treatment of wastewater take place in primary clarifier tank of plant. Coarse waste and suspended solids are detained in the tank (sedimentation and sludge storage). Additionally primary clarifier tank include special screen on inlet of feeding pump chamber. Sludge from clarifier must be removed 2…4 time per year; use of the special biopreparation allows reducing this number 1…3 times per year. Sludge remove frequency depending on real load of plant.

The pump’s power supply cable must be connected to the control board in the maintenance chamber in accordance with the circuit diagram.


4. Biological treatment in bioreactor

BioFix is a compact biological treatment plant with a full range of capabilities provided by the manufacturer. During the treatment in multiple-chamber bioreactor organic matter is removed from the wastewater. Treatment provided by using of fixed biofilm, formed on the special, with large and ideal surface for bacteria growth area, plastic carrier. A rich microbe life (biocenosis) exists in the biofilm ensuring the high treatment efficiency.Due to biocenosis there are fauruable conditions for nitrification-denitrification, both processes occur simultaneously due to specific conditions on biofilm layer.Suitable balance of bacterias and other microbes is formed for ideal circumstances both for the biological treatment and the minimum sludge production.During treatment process forming very small amount of exess sludge.The exess sludge is mostly mineralized. Bioreactor have four aeration chambers with biofilm carriers and air diffusers. The compressor must be switched on ; to achieve the required degree of aeration in the aeration chambers of the biological treatment plant the aeration collector is provided with valves.

5. Chemical dosing for phosphorus removal

To dose chemicals for phosphorus removal into the treatment plant’s flocculation pipe system it must be connected to the pressure pipe of the dosing pump located near the service chamber. Chemical pressure pipe ends with an injection nozzle in bottom of flocculation pipe system. Phosphorus will be removed in final clarifier. A dosing pump and a chemicals container has been installed near the service chamber. A current relay has been installed to control the dosing pump. It turns the dosing pump on when the feeding pump is turned on, and keeps it running until the end of the wastewater pumping cycle. Ferric sulphate or aluminium sulphate or other suitable for removal of phosphorus chemicals are used to remove phosphorus. Dose of chemical depending on phosphorus content in raw wastewater, generally it will be 100…300 g per m3 raw wastewater.

6. Final sedimentation

Final sedimentation take place in final clarifier. Inside of clarifier locating submerged sludge return pump. Sludge, formed in process of phosphorus and in biological treatment, removed from clarifier back to primary clarification tank by this pump.The sludge return pump is controlled by a time relay; the pump’s default settings for on-time (T on) and off-time (T off) are 20 sec. and 2 hours, respectively. The pump’s power supply cable must be connected to the control board in the maintenance chamber in accordance with the circuit diagram.

All the electrical installations of the treatment plant complex may only be installed by a qualified electrician.

7. Treatment technology and launch of the treatment plant

The treatment plant utilises a fully integrated (mechanical, biological, chemical) method of wastewater treatment. Coarse suspended solids are settled in the primary clarification tank, where the suspended matter content is reduced by 50…70%. Simultaneously, the organic matter content is reduced by 20…30%. It is recommendable (not obligatory) that a special biopreparation is added into the primary clarifier. The biopreparation would accelerate organic matter decomposition, reduce the quantity of sludge in the tank and deodorise the wastewater. The preparation would also contribute to reducing the number of times required to empty the tank of sludge. Without using the biopreparation sludge needs to be removed from the septic tank 2…4 times a year compared to 1…2 times when using it. It is recommended that once a year or after two year the bottom sediment of the bioreactor is also removed by means of a tank truck. To do this, the bioreactor have special shaft (in last chamber of bioreactor) for maintenance submersible pump for removal mineralized sludge from bottom of bioreactor.

The other way for removal sludge from bottom of bioreactor is lift out from bioreactor filter media. Clamps of the filter media cartridges are opened and the filter cartridges are lifted out from one section (all four sections of bioreactor are connected on bottom level). After removing the bottom sediment by means of a tank truck the filter cartridges must be put back into the same chambers in the same order. Before removing the sludge, must be turned aeration out and wait 15…20 min (sedimentation time).

The stainless steel flow screen located in the tank must be checked once monthly, and cleaned if necessary.

From the primary clarifier, the mechanically treated wastewater is pumped on into the biological treatment step (bioreactor). Bioreactor have aeration chambers. The aeration chambers of the treating plant house cartridges with plastic filter media and air diffusers. The compressor located in the service chamber pumps air into wastewater round-the-clock. This is required for the development of specific bacteria and protozoa. The bacteria and protozoa stick to the plastic filter media submerged in water; during their life cycle they consume the organic substances found in the wastewater. This process is characterised by low quantities of sludge.

Simultaneously with biological treatment there occurs a partial nitrification-denitrification process, as a result of which wastewater nitrogen content is reduced by 40…80%. The intensity of nitrogen removal decreases when wastewater temperature falls below +12°C. The efficiency of a properly functioning treatment plant is 90…99% with regard to organic matter (BHT) and suspended solids. This satisfies the requirements prescribed by law.

The bioreactor is provided with a chemical dosing device to remove phosphorus. In the course of chemical treatment the phosphorus found in wastewater is bound into heavier flocs and settled. The amount of chemicals required is contingent on wastewater phosphorus content; normally, the amount is 100…300 g per cubic metre of wastewater. The accumulated deposit is removed (into the primary clarifier) with the sludge return pump from final clarifier.

The launch of the biological process may take 2…4 weeks, depending on the circumstances. The bacterial community will develop in full in two to three months. When the established treatment process is temporarily discontinued (due to prolonged power outages, for instance) the normal process restores itself in a few days.

The optimal water temperature in the treatment plant ranges from +12°C to +16°C. At lower temperatures the biological treatment process starts to decelerate, and ceases at temperatures below +3°C.

NOTE: The main maintenance operation is to monitor whether the feeding pump and the compressor of the biological treatment plant function properly.