BioPro Ireland

- Model AT-75 to AT-400 - Group Schemes and Commercial for Biological Reactors



Group schemes and commercial applications use the AT-75 to AT-400 biological reactors. The larger bio-reactors consist of anaerobic – anoxic, aeration zone and a secondary sedimentation tank. All zones are installed in the single horizontal cylindrical unit and are separated by internal baffles. By means of the air blower the excess sludge is removed into the sludge stabilizer, which is  a separate unit.


The treatment unit includes an air blower mounted next to the plant.The shape, configuration, arrangement of treatment stages and equipment of bio-reactors installed are analogous to all AT-75 – AT-400 models. Along with the increase in the capacity of bio-reactors, so is the corresponding structural parameters of the equipment.

  • High-performance, removes nitrogen and phosphorus;
  • Uses no chemical substances;
  • No offensive odour given off;
  • Insensitive to peak flows;
  • Low power consumption (4PE uses 208 kWh/per annum);
  • Low generation of excess sludge (1 cub. m./per annum of excess sludge 4PE)
  • Occupies less space and spoils no aesthetic scenery, making the most of the available space;
  • Easy-to-use, cost-effective installation and maintenance;
  • Can be left free of wastewater for 30 days +, great for planning long-term trips and holidays;
  • Can operate under any weather conditions – due to the biological processes running in the plant, the contents of the tanks do not freeze even under a very low temperature;
  • Conforms to the highest ecological standards and produces no impact on nature.
  • The water treated in August Biopro water treatment plants could be reused as service water.

Ease of Installation

  • The August Biopro plant can be Installed and commissioned within 1 working day.
  • Water treatment systems start the moment the plant is started (no down time).


AT series packaged residential waste water treatment plants treat sewage for domestic dwellings. The treated waste water can be further discharged to surface or ground water (with authority permission) or, as the case may be, reclaimed, using it for irrigation.

In compliance with requirements of European standard EN 12566-3, our residential wastewater treatment plant was subject to a long-term efficiency tests of purification, comprehensive tests of static resistance, watertightness, durability and the checking of dimensions and accessibility. After completing proof of its conformity, performing the initial tests of the type and introducing in-house control of the manufacturing plant, the manufacturer issued a declaration of conformity that is fully in compliance with the EU legislation. On completion of the process, the manufacturer is authorised to label its AT to 50 pop wastewater treatment plants with the CE mark of conformity.

Basic description
The wastewater treatment plant consists of a polypropylene reactor with an inner built-in technological structure. The maximum achievable purification effect is based on the utilisation of low-load activation technology with aerobic sludge stabilisation. The AT wastewater treatment plant is covered with a removable, lockable PP cover. The plant uses a tried and tested system of continual biological purification of wastewater with an integrated accumulation of abruptly inflowing water. This technology is protected internationally by patent No. EP1919833. Our purification technology ensures the high quality of treated water as well as low investment and operating costs. The technology is also known under the international name of Vertical Flow Labyrinth - VFL.


Treatment process
Treatment consists of a sequence of several technological processes. Wastewater flows to a non-aerated space, where the nitrogen is biologically degraded and the conditions are created for the partial biological degradation of phosphorus. The preliminary mechanical purification of inflowing wastewater and the decomposition of solid contamination also occur here. The non-aerated activation space is divided into several inner partition walls creating a vertical flow labyrinth where internal circulation has been established.

Further, wastewater flows gravitationally into an aerated space with low-loaded activation, where, under the presence of oxygen, the biological degradation of organic contamination as well as the nitrification of ammonia nitrogen is brought about.

Air is supplied to the aeration system by diaphragm compressors or blowers with a side duct (high-pressure fans) that are placed outside the biological reactor. The pressurised air is blown into the aerated space through fine-bubble aeration elements. The pressurised air supplied through the diaphragm compressors is regulated by a control unit (microprocessor control unit) through the use of which the wastewater treatment plant may work in various modes depending on the loading.

Another degree of treatment is separation, whereby the treated water is separated from the activated sludge, while the purified water is discharged to a water flow or infiltration or is recycled and the set-off activated sludge is returned to the system by re-pumping from the bottom of the feeding space to the non-aerated space or, as the case may be, the aerated space. A stream flow regulator located in the feeding space allows the use of the built-in retention space in the wastewater treatment plant in the event of abruptly inflowing wastewater, thus preventing the plant from being overloaded. As a result, conditions are created for the discharge of wastewater via leakage into ground water and the reclamation of biologically purified wastewater, as the discharged water does not clog the pores of the filtration layer of the bedrock or filtration plant.

  1. Non-aerated space with vertical flow labyrinth
  2. Aerated space
  3. Feeding space
  4. Integrated retention space
  5. Inner circulation
  6. Recirculation of sludge
  7. Fine-bubble aeration
  8. Streamflow regulation

Various wastewater treatment plants operate in different manners, depending on the applied wastewater treatment technologies unlike conventional sewage treatment or a septic tank. Waste water is treated in biological treatment plants using biological methods and micro-organisms. Currently, all biological plants operate using active sludge (also called active, operating).

Active Sludge
Active sludge comprises of waste water particles and micro-organisms, present in certain parts of the wastewater treatment plant. These microorganisms also vegetate in the natural environment; however they are most effective in biological wastewater treatment plants, i.e. when they are saturated with air and wastewater. Concentration of microorganisms is considerable, as the conditions which the treatment plant offer ensures rapid decomposition of the waste water.

Chemical-Free Operation
Systems with active sludge are classified as intensive wastewater treatment systems. During various treatment stages, all harmful chemical materials are dissociated, therefore water is pure enough to release it into the soil or to collect it in reservoirs and re-use, e.g. for car washing, watering of plants, etc. Biological wastewater treatment plants using active sludge enable rejection of any chemicals during the wastewater treatment process and perform a high level of wastewater treatment. Note not all wastewater treatment plants feature such high parameters of treated water. Application of active sludge technology requires no additional filters and no other equipment (unless requested by the client or project conditions). This is a cost-effective and environmentally-friendly method.

All processes of the biological treatment (treatment of wastewater with active sludge, separation of sludge from treated wastewater and returning of sludge into the aeration reservoir where wastewater is mixed with active sludge, supplying air) happen in one reservoir. This ensures more reliable and stabilized operation.

Active sludge decomposes contaminants and is separated from treated wastewater. Problems such as disturbances of treatment equipment, outflow of active sludge, and unpleasant odour etc. are avoided. However not all wastewater treatment plants are secured from the outflow of sludge, therefore you should inquire how the competition addresses this problem, e.g. August BioPro wastewater treatment systems are equipped with funnel-shaped separation zones. Since the sludge features heavier weight, it settles at the bottom of the equipment and is returned into the treatment process or its surplus is removed. At the same time the treated water (also called “technical”) is released via a pipe installed at the top of the system - water is released to the environment or collected for further application.

Extremely Pure Water
During various biological processes (nitrification, de-nitrification, etc.) active sludge removes the nitrates, phosphorus (located in, e.g. washing powder), nitrogen (present in urine, excrement, etc.) and other materials delivered with sewerage.

Removal of materials, such as phosphorus and nitrogen is very important, as these materials can access water bodies and increase the growth of plants, thus reducing the volume of oxygen in water bodies. This usually results in reduction of fish and other wildlife in lakes and rivers (e.g. they suffocate more often in winter, as intensive greenery absorbs oxygen), thus disturbing the balance in water bodies.

Not all wastewater treatment plants are capable of cleaning wastewater from nitrogen, phosphorus and other materials, as they are not equipped with nitrification, de-nitrification and other zones, therefore they may need filters or other auxiliary equipment, imposing additional costs. Thus wastewater treatment plants with active sludge are convenient and efficient, as the treated wastewater is turned into odourless and colourless water, free from materials harmful to the environment.

Single refill
Active sludge is poured into the newly mounted wastewater treatment plant, before letting in the wastewater. Active sludge is delivered from ready operating plants. This is a single action, as the sludge is nourished and reproduces using wastewater; no additional refill is needed. Full efficiency of the wastewater treatment is obtained instantly.

Resistant to Variations of Volume of Wastewater
Automatic operation of wastewater treatment plant with active sludge, resistant to variations of volume of wastewater during the day is extremely practical. For example, in the morning you have a shower, whereas you only use a toilet during the day, and in the evening you wash your dishes and bathe a baby.

Using a wastewater treatment plant generates a surplus of active sludge. When you select the right size biological wastewater treatment plant, the volume of the surplus sludge from the smallest plant designed for a 4-person family will be approximately 1 m3 annually. However if you select a wastewater treatment system which is too small to satisfy your needs, the volume of surplus sludge may increase and you will have to remove it more often.

Sludge is removed opening the lid of wastewater treatment plant. This can be done by the maintenance personnel or the owner themselves.

Resistant to Chemicals
Biological wastewater treatment plants with active sludge are resistant to chemicals, therefore you can use all domestic chemicals - dish washing liquids, washing powder, shampoos, soaps, etc.

Even toilet paper does not disturb the treatment process; however there are some materials that must not enter the wastewater treatment system. They can block or damage your sewerage system in some other way.

For example, items such as diapers, condoms, hygienic liners, cigarette ends, plastic, paper and other materials insoluble in water must never enter the sewerage and sinks. Never pour remains of paint, grease or other similar materials to sewerage. Our units come with a primary screening system that can be cleaned out should larger solids enter the system by accident.

Compact and simple
Biological wastewater treatment plants with active sludge are compact in size. E.g. wastewater treatment plant designed for individual house is approximately 1.5-2 m in diameter and approximately 2 m in height. The only part of the plant observed on the surface is the lid. If the plant operates and is used correctly, its operation is invisible – no noise or unpleasant odour is emitted.

Naturally, the size of plant designed for hotels, restaurants and other large-scale projects is greater, however our patented treatment technology reduces the size of the plant, compared with other treatment technologies (e.g. septic).

Wastewater treatment plants designed for individual houses are simple to transport and installation can be performed by the owner, according to the manufacturer’s specifications.

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