BioPro Ireland

- Model ATCP & AT Series - Small Residential Treatment Plant



Small treatment plants From the AT-6 to the AT-50 series treat the volume of sewage wastes at a rate of 0.5 up to 7.5 cubic metres per day, are are designed for; Single Homes, apartments, hotels, restaurants, schools, camping sites, farms & rural dwellings, small-scale companies, etc.

  • 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 wastewater treatment plants could be reused as service water.

Ease of Installation

  • The August Biopro plant can be Installed and commisioned within 1 working day.
  • Wastewater treatment starts the moment the plant is started (no down time).

ATCP Series – Regular Treatment 13mg/l BOD / 13mg/l SS / 2mg/l NH4-N

AT Series – Advanced Treatment 5mg/l BOD / 10mg/l SS / 1.2mg/l NH4-N


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.


August BioPro qualified installation technicians perform all installation works for domestic wastewater treatment plants. Here is a brief description of a typical installation of the AT series waste water treatment plants for a domestic application. All quotations have a list of requirements to ensure the install goes smoothly on the day.

For a standard installation, the location for the wastewater treatment plant must be down grade so the treated water can self discharge. The treatment plant cannot be installed in an area where there is an accumulation of rain or ground water. The plant’s lid must be accessible for regular inspection. (1)


The holes for the plants assembled are excavated in two stages. On the first stage, the hole is excavated by the digger, to a certain level. On the second stage, a 20-30 cm layer is dug manually. This is the way to ensure the assembling of the plant on undisturbed earth. The depth of the hole depends on the deepening of the wastewater pipe at the location the plant is assembled at (2).


Our system must be assembled on a concrete base in order to ensure horizontal and vertical position. The thickness of the concrete on the undisturbed earth is approximately 15-20 cm with the standard reinforcing mesh. Alternatively it is possible to use the underbodies of reinforced concrete collars (KCD) of the required diameter. When the level of ground water is high, the installed plant must be anchored to the concrete base. In this case, a binding gravel of 40 cm thickness is poured and thickened on a concrete base prepared in advance, and then plant’s tankage is fixed to the concrete base by means of assembling lifting lugs. (3)


After placing the plant in the hole and examining its project position (depth, horizontal and vertical positions), the inflow and outflow pipelines (the pipes must rest on firm base and stay fixed) are attached. It is required for diameters of the plant’s sleeves to match the diameters of the inflow and outflow pipes for treated water. The depth of the wastewater supply pipe has to match the depth of the plant’s sleeve. (4)


The location for the air blower is selected according to the technical requirements; the air blower can be assembled both in a domestic environment (in a garage, warehouse, etc.) or outdoors. The air blower installed inside the premises must be out of contact with a wall or any other building structure. If the air blower is to be installed outdoors, it must be protected from humidity, rain and dust. If the air blower is to be installed next to the plant (common method), then an electric cable 220V- 3X1.5Cu (5) must be run from the dwelling to the plant.


Where the air blower is installed inside the premises, when installing the air-supply pipes from the air blower up to the plant, it is required to reduce the air pressure loss to a minimum. This must be done by reducing the number of elbows in the system. According to the technical specifications of the air blowers, the distance from the air blower up to the plant cannot exceed 6 m.


The plant placed on the project position is gradually filled with water and the gap between the hole and the plant is filled with binding gravel (free of solid stones). “Gradually” means water is filled into the plant and binding gravel is filled around the plant in 20-30 cm layers. Binding gravel is thoroughly thickened up to the required density. The plant is filled with water up to the level of the outflow pipe. (7)


After the installation of the plant is completed, August BioPro technicians perform the pre-commissioning of the plant. The plants are entered into service by delivering the active sludge from the already running biological treatment plants (the sludge index does not exceed 150 mg/l or the sludge is not older than 20 days). When commisioning:

  • After starting the air blower and opening the air valves, the air flow is directed to the air-lift pumps and aeration elements. The time is programmed and the air amount is adjusted;
  • A thick layer of sludge is thinned and re-pumped to the aeration zone. This must be done in the way to ensure the entire plant would not be over swamped with the sludge;
  • Wastewater inflowing into the plants is initiated. (8)


Depending on the location of your system and means of disposal, the treated water in the wastewater treatment plant can be released into the ground (via infiltration wells, filtration fields), discharged to the roadside, reclamation pits, released to open water sources and reused. (9) following local building codes and best practises.

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