We sell biological wastewater treatment plants with a capacity over 100 residents equivalent* (approx. between 75-750 persons) made up of circular cross-section tanks, or with container design. These wastewater treatment plants serve for the treatment (purification) of wastewater from condominiums, apartments, smaller villages or settlements, restaurants, schools, hotels, camps, holiday houses, plant sites.
The biological purification of wastewater from butcheries, dairy plants or wineries is also possible. Please contact us for a proposal.
(* 1 resident equivalent means a water consumption of 135 liters/person/day.)
Biological Wastewater Treatment Plants – Technological Description:
The process of biological wastewater treatment consists of several technological components. After a mechanical cleaning, the biodegradation of nitrogen and the partial biodegradation of phosphor occurs in the anaerobic fermentation zone. Within the wall-separated chambers the internal circulation of activated sludge is ensured. After the anaerobic zone, activated sludge falls into the aeration tank by means of gravity, where the degradation of biological contaminants occurs along with the nitrification of ammonia and nitrogen. Air enters the aeration chamber through a fine bubble membrane diffuser on the bottom of the reactor. The diffuser ensures the flow of an adequate amount of air into each part of the reactor. The duration of aeration is regulated by a digital controller.
The next phase of biological wastewater treatment is the separation of activated sludge from purified water. This process is performed in the post-settling chamber. Settled activated sludge is returned to the anaerobic fermentation zone by an air-lift pump, it is thus recirculated. Due to the sludge thickener tank, where the aerobic stabilization of activated sludge takes place, sludge production is lower, than in case of other similar technologies. Finally, the purified water can be reused. In case water is not reused, it can be desiccated, or let into live waters depending on a water rights permit. The system provides a stable water purification process.
The above technological process may be supplemented with a grease collector chamber (in case of large amount of wastewater from kitchens – e.g. canteens), intermediate sewage pumps and purified water tanks depending on system dimensions and local/individual requirements.
The approval permit of biological wastewater treatment plants of this scale require a water rights permit, which has to be requested from the competent Environmental Protection, Nature Protection and Water Safety Authority.
If you are interested in a plant with a capacity of between 2-50 persons, please review our domestic scale, biological wastewater treatment plants!