BIO-S 1,5: domestic wastewater treatment plant for 6-10 persons

We produce wastewater treatment plants of the BIO-S series suitable for cottages and lodges. These are all-plastic mechanical-biological wastewater treatment plants used for the treatment of sewage that arises from small sources of pollution and cannot be connected to a central wastewater treatment plant due to their location or other reasons.

Whether you choose a BIO-S 0.5, BIO-S 1 or BIO-S 1.5, all can be combined with a ground and sand filter or a root treatment plant.

Description and functions of the BIO-S 1.5

The BIO-S 1,5 is a full plastic tank which has 3 functional compartments - settling and settling area, 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 1.5 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. Anaerobic wastewater treatment is recommended for cottages and cottages as it allows intermittent operation. Another great thing is that the BIO-S 1.5 treatment plant operates without the need for electricity, so you can expect low operating costs.

The microbial colonisation that grows on the rugged 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 biosolids charge consists of PP rings which are placed in removable baskets (6). The packing serves as a carrier for the 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.

Where to use the BIO-S 1.5 wastewater treatment plant

The BIO-S 0.5, BIO-S 1 and BIO-S 1.5 wastewater treatment plants for cottages and cottages supplied by us are used for anaerobic treatment of sewage from residential sites, farms and for buildings with a capacity of 2-10 equivalent persons (for 1 EO, a BOD5 value of 60 g/day and a wastewater quantity of 150 l/day are considered), which are not permanently inhabited, such as holiday homes.

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

Technical data of the BIO-S 1.5 sewage 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.