Wastewater Treatment Plants - Aquatec VFL, s.r.o.

General information – small wastewater treatment plants

Packaged residential wastewater treatment plants of the AT 15 to AT 50 series purify sewage water from residential buildings or groups of buildings and wastewater sources, where sewage water is produced (e.g. accommodation facilities, restaurants, schools, recreational facilities, production plants etc.). Purified wastewater can be further drained in the surface or ground water or recycled to water lawns and greenery.
In compliance with the requirements of European Norm EN 12566-3, our residential wastewater treatment facility underwent a long term test of treatment efficiency as well as comprehensive tests of static resistance, watertightness, durability and a check of dimensions and accessibility. Upon proving conformity, performing initial tests of the type and introducing an in-house review of the manufacturing facility, the manufacturer issued a declaration of conformity stating that it fully complies with the EU legislation. After completing the aforementioned process, the manufacturer is authorised to identify its AT 15 to 50 EO wastewater treatment plants with the CE mark of conformity.

Basic description
The wastewater treatment facility is made of an all-plastic 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 facility is covered with a removable PP cover. The AT wastewater treatment facility uses a tried and tested system of continual biological purification of wastewater with an integrated accumulation of abruptly inflowing water. This technology is protected in Slovakia by utility models UV 4324 and UV 2750 and 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®.
The wastewater treatment facility of the type AT is delivered based on a binding order, while payment and delivery conditions are subject to mutual agreement between the customer and supplier.

Purification process
It consists of a sequence of several technological processes. Wastewater flows to a non-aerated space, where 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.
In addition, 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 facility 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 it 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 streamflow regulator located in the feeding space allows the use of the built-in retention space in the wastewater treatment facility in the event of abruptly inflowing wastewater, thus preventing the facility 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 facility.

European Union
The AT wastewater treatment facility with a built-in retention space meets the EU requirement for resistance to abruptly inflowing wastewater, thus ensuring the homogeneous operation of the residential wastewater treatment facility even in the event of an abrupt inlet of a higher volume of water (e.g., from a bath tub or washing machine). As a result, the main problem of the residential wastewater treatment plants is resolved in respect of the elutriation of activated sludge from the wastewater treatment facility upon any abrupt inflow.

Technological parameters
The quality of purified water corresponds to the requirements of Directive No. 269/2010 of the Collection of Laws of the Government of the Slovak Republic on discharges into surface and ground water.

Technical parameters: