BIO-S 1: domestic wastewater treatment for 3-6 persons

The packaged, all-plastic and mechanical-biological wastewater treatment plant BIO-S 1 for cottages and cottages designed for 3-6 persons is used for the treatment of wastewater arising from small sources of pollution, which due to their location or other reasons cannot be connected to a central WWTP.

However, we also offer the BIO-S 0.5 for 1-3 persons or the BIO-S 1.5 for up to 10 persons, which exactly meet the needs of the size of the number of people. In addition, the BIO-S series of domestic wastewater purifiers can easily be combined with a ground and sand filter or a root treatment plant.

Description and functions of the BIO-S 1

The basis of the BIO-S 1 wastewater treatment plant is an all-plastic tank with three functional compartments - a settling and dosing compartment, an anaerobic reactor. All parts of the treatment plant are made of integral polypropylene. The tank is closed with a lid made of UV-resistant polypropylene plates. The lid is fitted with inspection hatches. The cover is not permeable.

How the BIO-S 1 domestic wastewater treatment plant works

The technology of wastewater treatment is based on anaerobic processes, where organic substances are removed by the action of microorganisms. The great advantage of anaerobic wastewater treatment is the low operating costs and the possibility of intermittent operation. Therefore, it is an ideal solution for cottages and cottages.

The microbial colonisation that grows on the granular surface of the biofilter gradually reduces the organic content of the wastewater. Microbial decomposition of organic pollution takes place without access to air oxygen and is an intensification of natural processes occurring spontaneously on the bottom of lakes and ponds.

The raw wastewater flows into the plant from the sewer through the inlet (1) into the first settling section (2), where light and floatable particles are separated. The settled coarse impurities are anaerobically stabilised. The resulting primary sludge is thickened and stored at the bottom of the settling tank. The settling chamber includes a bore wall and a check valve (3) which serves to de-sludge the anaerobic reactor. The valve is positioned so that a layer of sludge (approx. 30 cm) remains in the reactor for inoculation of the WWTP after sludge removal. The non-return valve is activated automatically when the sludge is removed and the water level in the settling tank is lowered.

The pretreated water is fed evenly through a distribution spillway (4) into the anaerobic hybrid reactor (5). The design is a vertically flowing column with a sludge cloud at the bottom and a biosolids charge at the top. The BIO-S 1: Domestic wastewater treatment plant for 3-6 persons, the bionic carrier cartridge consists of PP rings which are placed in removable baskets (6). The cartridge serves as a carrier for active biomass, which helps to retain the biomass in the reactor and also serves as a biomass separator creating favourable conditions for sludge granulation in the lower part of the reactor.

The water from the reactor flows out with the dead organisms into the settling section (7) where the flocculent material is separated from the water by simple sedimentation. The anaerobically stabilised sludge from the settling and sedimentation tank is removed once every 1-2 years by fecal truck. The water from the settling tank flows through a gravel filter (8) collecting the floated sludge on the surface via a PP pipe ( 9) to the sewer.

The high proportion of biomass on the carriers allows for a high self-regulating capacity of the plant, which is favourable under impact loads. In the event of increased demands on the effluent concentration, microbial preparations can be dosed into the treatment plant to support the biological processes of organic pollution degradation. The efficiency on BOD5 is increased by 5-10 %. Dosed bacteria die naturally after nutrients have been disposed of and therefore regular dosing is necessary.

The appropriate type of preparation can be consulted with the supplier. These are commonly commercially supplied microbial preparations approved by the State Institute of Health and the Ministry of Health of the Czech Republic (e.g. lato apd - 900, cpl - 50 g).

Where to use the BIO-S 1 wastewater treatment plant

The BIO-S 1 sewage treatment plant is intended for anaerobic treatment of sewage from residential sites, farms or recreational facilities with a capacity of 3-6 equivalent persons (for 1 EO, a BOD5 value of 60 g/day and a wastewater volume of 150 l/day are considered).

The initial basis for the design and location of the WWTP is the requirements of investors, planning authorities and water authorities.

Technical data of the BIO-S 1 treatment plant

The inlet for connection to the sewerage system is made with a PP pipe DN 160/140 mm, the outlet with a pipe DN 110/90 mm. For proper operation, the WWTP must be designed with maximum flow and total material load in mind. At the maximum substance and hydraulic load, the BOD5 value at the outlet is up to 45 mg/l.