Sewage treatment up to 50 PE

A revolutionary non-electric domestic sewage treatment system – the ClearFox® Nature

Do you need a need a domestic sewage treatment plant for your house or your project? Then the ClearFox® Nature is the perfect solution for you! already installed in over 50 countries worldwide.

The ClearFox® Nature is a packaged wastewater treatment plant manufactured by PPU Umwelttechnik GmbH. It is suitable for the treatment of wastewater from individual houses and small communities of up to 50 people. It can be used for new development, or to upgrade existing septic tanks. For larger applications over 50 persons, the use of a modular, containerized ClearFox® Nature wastewater treatment plant is possible.

The sewage from our small packaged wastewater treatment plants can be safely discharged into the environment, or used to irrigate green spaces. The ClearFox® Nature uses advanced, market-leading technology developed by PPU Umwelttechnik GmbH in Germany.

Filling and settling phase

The wastewater first flows into a prechamber. This prechamber is split into a sludge settlement tank and a buffer tank. Heavy solids and large particles settle to the bottom of the sludge tank. A baffle wall makes it impossible for these solids to enter the biological reactor. In the buffer tank, the incoming wastewater flow is equalised, to ensure peak flows do not effect the treatment process.

Transition to the biological reactor

The flow of wastewater to the biological reactor is regulated by a butterfly valve. This is a floating valve, which restricts and controls the flow of sewage into the biological reactor. When the water level in the buffer tank rises from incoming wastewater, the valve also rises. This then allows wastewater to start flowing into the biological reactor. As the flow is restricted to a specific rate via the butterfly valve, there is a continuous and steady flow of wastewater into the biological reactor. This ensures stable and efficient biological treatment. This flow control mechanism is absent from many systems on the market.

Distribution of the wastewater

From the buffer tank, the wastewater flows onto a mechanical tipper tray. This fills continuously with wastewater until it tilts due to the increasing weight on one side. Thus, it distributes wastewater equally over the perforated distribution tray. All parts of the flow control and distribution system are made of durable and corrosion-free HDPE. Via the perforated tray, the wastewater flows with even distribution into the biological reactor below. This guarantees stable operation without overloading, and ensures the effluent quality is consistent.

Wastewater cleaning

The wastewater treatment takes place in the biological reactor. The reactor contains various materials on which the microorganisms in the wastewater grow. These microorganisms multiply and consume the pollutants in the wastewater without the need for any chemicals or additives. The biological reactor is designed so that the wastewater passes through the media layers slowly. This ensures complete cleaning of the wastewater takes place. The special media consists of resistant plastic fibers and a fixed bed material, both of which have an incredibly high surface area for bacteria to grow on. All materials are designed not only for the exceptional growth characteristics of microorganisms, but also for durability and reliable cleaning performance.

Discharge of the treated wastewater

The treated wastewater collects at the bottom of the domestic sewage treatment plant and exits there. Through aerobic sludge stabilization, the plant reduces no secondary sludge. This eliminates the need for regular pumping required by septic tanks or other conventional sewage treatment systems. The treated wastewater is suitable for irrigation, infiltration to ground or direct discharge into a watercourse. The ClearFox® Nature achieves a COD of 88 mg/l and a BOD5 of 16 mg/l. This has been certified by independent testing institutes. The ClearFox® Nature is certified to EN12566-3, and also has many regional approvals for other countries.

Ventilation

Air is a critical component of aerobic wastewater treatment. The microorganisms need oxygen to degrade the contaminants and decompose the carbon. The ClearFox® Nature aerates using a natural ventilation process, with small air vents on the system. This chimney ventilation effect is responsible for ensuring that air circulation can take place. The special design of the ClearFox® Nature ensures there is no odour during this natural aeration process.