METRIA SBR 4-6 domestic sewage treatment plant

Home biological treatment plant SBR 4 – 6 with a capacity of 3500L designed for 4 to 6 people.

Home sewage treatment plants are a modern solution to the problem of liquid waste in areas without access to municipal sewers. Their main advantage over traditional concrete septic tanks is that:

• they don’t leak
• the tanks are made of high-quality PEHD plastic in accordance with the PN-EN 12566-1:2004/A1:2006 standard
• if the installation is done well, their operation is not burdensome
• are environmentally friendly
• they do not emit unpleasant odors as in the case of a traditional septic tank

Most treatment plants save around 6,000 PLN annually by eliminating the need for monthly sludge removal, as is the case with a traditional septic tank. Most home treatment plants remove sludge once a year or at most every two years, saving both money and time. The variety of solutions and technologies available for home sewage treatment plants allows for a solution tailored to the client’s needs, soil conditions, and the appropriate infiltration system.

The SBR sewage treatment plant is designed to treat wastewater from households without access to a sewage system.

The treatment plant operates on the basis of a primary (septic) tank and a biological reactor operating in a sequencing batch reactor (SBR) system. The use of activated sludge technology was pioneered in 1914 as a sequencing batch reactor (SBR) in England by Ardern and Lockett. The name “activated sludge” comes from the fact that the treatment process produces an active mass of microorganisms capable of biologically decomposing organic matter. In terms of operation, biological wastewater treatment using activated sludge is achieved by feeding wastewater to a reactor containing a suspended aerobic bacterial culture. After an appropriate reaction time, the treated wastewater is separated from the bacteria and discharged from the system. In the reactor, the bacteria decompose organic compounds according to the following reaction:

Organic matter + Oxygen + Nutrients + Microorganisms + New microorganisms Carbon dioxide + Water + Energy for life

This allows us to achieve a very high level of wastewater contamination reduction at the outlet, ensuring a solution that will provide years of trouble-free service with proper operation. Furthermore, when combined with a drip irrigation system, we not only save money on operating costs but also contribute to environmental sustainability.

SBR technology first appeared in scientific literature in 1898, described by Thomas Wardle, and has been used for decades in both small and large facilities. The reactor cycle occurs cyclically every 8 hours. This cycle consists of:

• filling – the time interval during which raw sewage is fed to the batch reactor
• mixing – a time interval during which the reactor contents are mixed without the supply of oxygen, which causes anaerobic conditions to be created
• aeration – the time interval during which the contents of the reactor are aerated
• reaction – the time interval during which aerobic biological processes take place
• sedimentation – the time interval during which the activated sludge is subjected to the sedimentation process
• decantation – the time interval during which the treated sewage is delivered to the receiver
• dead time – the time interval during which excess sludge is removed
• waiting – time interval during which the reactor waits to be refilled (optional)

Despite the seemingly complex treatment process and construction of the treatment plant, and thanks to the use of a Polish-made controller, a mammoth pump, and all compressed air components, there are no mechanical components in the tank. This ensures trouble-free operation of the treatment plant, provided, of course, that we do not throw anything down the drain except toilet paper, such as:

• wet wipes, including (baby wipes)
• cigarette butts
• sanitary pads, tampons and diapers
• hair
• dressing materials
• pills, lozenges and other solid medications
• paints, solvents, adhesives, varnishes
• pesticides, herbicides and other biocides
• oils and fats
• brine resulting from the regeneration of the water softener

Avoiding the introduction of the above-mentioned waste into the drain is a key condition for maintaining the bacteria inhabiting the settling tank – the biological part of the treatment plant – in good condition, which has a significant, measurable impact on the operation of the entire treatment system.

Thanks to its design, the treatment plant is resistant to uneven sewage flow, overloads, temperature fluctuations, and temporary sewage outages, e.g., due to vacations. It is also highly resistant to power outages. In the event of a power outage, the control system adjusts the treatment phases to the amount of sewage entering the treatment plant and activates a phase depending on the amount of wastewater collected.

Advantages of SBR treatment plants:

– Safe construction of the device – due to the lack of moving parts, no electric pumps, monolithic tank made of polyethylene (PE) ensuring the tightness of the device.

– The treatment plant has the CE mark – it has been tested by a notified testing body for compliance with the PN – EN 12566-3 +A1:2009 standard, ensuring high treatment efficiency confirmed by tests.

– Low sensitivity to power outages – in the event of a power outage, the control adjusts the treatment phases to the amount of sewage flowing into the treatment plant and activates the appropriate phase depending on the collected sewage.

– The purification process is automated – allowing control over the purification cycle, and the control is also adjusted to the amount of sewage inflow.

– Possibility to set the treatment plant to standby mode – allows the treatment process to be maintained even in the absence of sewage flow for up to 2 weeks.

– Long service life and reliability – PE tanks are made monolithically and additionally reinforced inside the tank with a steel frame.

For safe operation of the device, a fuse box must be installed.

Scheme of the treatment plant:

Scheme of the treatment plant:

2. SBR reaction chamber

3. Hatch

4. Connecting pipes DN 110

5. Compressed air lift

6. Sediment protection tube

7. Activated sludge aeration membranes

8. Compressed air lift

9. Compressed air lift

The treatment plant includes:

– SBR tank

– Extension with controls and cover

– Extensions: DN 600 H-0.5m 2 pcs.

– Cover DN 600

The treatment plant with a 48 m drainage system includes:

– PVC pipe DN 110 gray 1m – 6 pcs.

– Distribution chamber DN 400 H- 0.7m or DN 400 H-0.5m or DN 400 H-1.1m – 1 pc.

– PVC elbow DN 110 87° gray – 5 pcs.

– PVC drainage pipes DN 110 gray 2m – 24 pcs.

– Ventilation chimney – 3 pcs.

– Geotextile width 0.5m – 49 m

The 150L tunnel infiltration treatment plant includes:

– PVC pipe DN 110 gray 1m – 3 pcs.

– Distribution chamber DN 400 H-0.7m – 1 pc.

– PVC elbow DN 110 87° gray – 1 pc.

– Tunnels drainage 150L – 8 pcs.

– PVC drainage pipes DN 110 gray 2m – 4 pcs.

– Ventilation chimney – 1 pc.

– Geotextile 2m wide – 8 m

The 300L tunnel infiltration treatment plant includes:

– PVC pipe DN 110 gray 1m – 3 pcs.

– Distribution chamber DN 400 H-0.7m – 1 pc.

– PVC elbow DN 110 87° gray – 1 pc.

– 300L drainage tunnels – 6 pcs.

– Ventilation chimney – 1 pc.

– Geotextile 2m wide – 8 m

The treatment plant with a soakaway includes:

– Absorbent well DN 600 H-1m perforated with side drainage holes

– DN 600 cover in green

– Geotextile 2m x 2m

Installation on the premises throughout the country by professional teams of installers – agreed upon individually.

Do you have any questions? Call us and we will advise you on choosing the optimal solution for you.