Sizing a Containerized MBR STP for Berlin Projects (2026 Guide)

Why a Containerized MBR Fits Berlin Residential and Camp Projects

A containerized membrane bioreactor (MBR) packs a full biological train and submerged ultrafiltration into a 20' or 40' high-cube ISO container, which is why it is the dominant mobile sewage treatment plant form factor for decentralized Berlin loads. Pure Aqua's MBR-C system is built around hollow-fiber PVDF UF at a nominal 0.04 µm pore size inside an insulated, seaworthy container with a 1.5 mm drum screen on the inlet (Pure Aqua). MENA-Water packages biological treatment, stainless internal tanks and a Plug & Play factory acceptance test into 40' ISO containers, with an I-Version that is fully integrated for sites where the plant may be relocated at end of lease (MENA-Water). The HydropureWater integrated MBR system (10-2,000 m³/day) envelope covers everything from a small residential block to a multi-container camp plant.

For a Berlin project manager, the deployment logic is as much about permitting and site constraints as it is about hydraulics. Inner-city lots are tight, building-permit timelines run through the Bezirk and Senatsverwaltung, and a permanent in-ground STP is often a non-starter for a refugee camp, a worker accommodation, or a phased housing estate. A containerized MBR can sit on a slab, be delivered by standard truck, be lifted by crane, and be recommissioned at a new site. Where the project is inside the Berlin mixed-sewer district and a BWB connection is feasible at acceptable cost, connection to the Berliner Wasserbetriebe network usually wins; outside that envelope — and for temporary or brownfield redevelopments — the containerized MBR is the right technology class.

The Seven Inputs That Drive MBR Sizing

Sizing fails when any of the seven inputs below are guessed. Lock these down before you approach a vendor, and the proposal you receive will be defensible in front of the Berliner Wasserbetriebe or the Senatsverwaltung.

The single most common mistake is to take a US-flavored 50 gpd per capita figure (Pure Aqua) and apply it directly to a German residential or camp load. Use DWA-A 198 in litres per person per day, and convert to m³/day only after the peak factor is applied.

Translating Inputs into a Daily Flow and Hydraulic Load

Once the seven inputs are fixed, the arithmetic is mechanical. It should be repeated by the engineer, not delegated to the vendor, because it is the only sanity check that survives a Senatsverwaltung review.

1. Average daily flow Q_avg = population × per-capita flow, using a DWA-A 198 value in L/p·d and dividing by 1,000 to reach m³/d.
2. Peak daily flow Q_peak = Q_avg × peak factor (2-3× residential, 4-5× camp). Q_peak sets the membrane tank volume and the feed pump duty.
3. Daily organic load = population × per-capita BOD (g/p·d) ÷ 1,000, expressed as kg BOD/d. This sizes the aeration tank and verifies that the MLSS window of the chosen MBR module is achievable.
4. Temperature derating for Berlin winter conditions. Pure Aqua's design temperature is 20°C with an operating window of 20-30°C (Pure Aqua); Berlin sewage drops well below that, so confirm the membrane flux derating and the minimum HRT with the membrane vendor.
5. Inflow/infiltration margin of 10-20% for older Berlin combined-sewer districts, where groundwater ingress can dominate dry-weather flow.

The output of these five steps — Q_avg, Q_peak, kg BOD/d, and a derated flux value — is the document you send to vendors. Vendors who quote a m³/day number without seeing the underlying Q_peak, BOD load and winter temperature are guessing.

Matching the Daily Flow to an ISO Container

Match the derated daily flow to a single container before you consider multi-container layouts. MENA-Water states that more than 1,200 m³/day can be treated in one 40' ISO container, with stainless internal tanks and Plug & Play factory testing (MENA-Water). Pure Aqua confirms that 40' and 20' high-cube container formats are available depending on capacity (Pure Aqua). The HydropureWater integrated MBR system (10-2,000 m³/day) envelope covers both endpoints of that range.

For the membrane stage itself, the HydropureWater DF series flat-sheet MBR modules deliver 32-135 m³/day per cassette at a 0.1 µm pore size, with 80-225 m² of membrane area per module, and are specified at 10-20× lower energy than external cross-flow systems. Pure Aqua's MBR-C uses submerged hollow-fiber PVDF modules with a 0.04 µm nominal pore size, installed in a 20' or 40' HC container (Pure Aqua). I-Version (fully integrated in one container) is usually the right call for dense Berlin sites because it keeps all equipment above ground and accessible; the U-Version, where aeration and buffering sit in underground tanks beneath the container, makes sense where above-ground footprint is the binding constraint (MENA-Water).

One detail that decides whether the plant can be plugged into a Berlin site at all: Pure Aqua's standard electrical supply is 460V/3Ph/60Hz, which does not match Berlin's 400V/3Ph/50Hz. Specify 400V/3Ph/50Hz and a transformer if needed in the enquiry.

Biological Stage, Membrane Stage and Pre-Treatment

Vendor block diagrams look different but the unit-process chain is the same. On the inlet, a 1.5 mm drum screen protects the membranes (Pure Aqua); a GX series rotary mechanical bar screen ahead of the drum screen catches rags and FOG from camp kitchens and dining halls, which keeps the biological stage from being overloaded. Skyview lists FOG content explicitly as a sizing variable that drives the pre-treatment train and aeration tank volume.

The biological stage is AO for carbonaceous BOD removal only, or A2O when total nitrogen must be reduced to meet the EU Urban Waste Water Directive 91/271/EEC and the German Abwasserverordnung (AbwV) limits that apply through size class. Skyview packages A2O+MBR as a standard integrated system for municipal and residential effluents. The MBR step eliminates the secondary clarifier entirely; biomass stays in the aeration tank at high MLSS, and the submerged UF membranes retain bacterial flocs, suspended solids and viruses (MENA-Water, Pure Aqua).

For the membrane stage, Pure Aqua's submerged modules are PVDF hollow-fiber made by thermally induced phase separation, with a nominal 0.04 µm pore size and coarse-bubble air scouring for fouling control (Pure Aqua). The HydropureWater DF series uses flat-sheet UF at 0.1 µm. MENA-Water notes that the membranes do not need regular chemical cleaning beyond one or two maintenance clearings per year (MENA-Water). Excess sludge is wasted to a plate-and-frame filter press for the waste-activated sludge rather than disposed of as liquid. For any reuse use case — irrigation, toilet flush, greywater — a UV sterilizer for the effluent polish delivers a chemical-free disinfection barrier and is effective against chlorine-resistant organisms.

Berlin-Specific Compliance and Site Constraints

Compliance starts with the discharge route. If the effluent goes to the Berlin mixed-sewer network, the receiving body is the Berliner Wasserbetriebe and the indirect-discharge envelope under the AbwV applies. If the effluent goes to a surface water body, the EU Urban Waste Water Directive 91/271/EEC applies directly, with size-class-specific BOD, COD, total nitrogen and total phosphorus limits, and an A2O+MBR train becomes the default. Identify the correct AbwV size class for the project and confirm the limits in writing with BWB and the Senatsverwaltung für Mobilität, Verkehr, Klimaschutz und Umwelt before the vendor is selected — this is the step that determines whether the biological stage is AO or A2O.

Berlin winters drive the second set of decisions. Sewage temperature falls well below the 20-30°C operating window and the 20°C design temperature that Pure Aqua publishes (Pure Aqua), so flux must be derated, the aeration tank must be enclosed and insulated, and the container must be specified with an enclosure heating trace and a documented cold-start procedure. The MENA-Water insulated container walls are the right baseline, but confirm the cold-weather package explicitly.

Site and permitting constraints in Berlin are usually the binding driver, not hydraulics. Inner-city lots constrain the crane reach for a 40' HC delivery, noise limits at the property line constrain blower selection and enclosure treatment, and odour constraints push for an enclosed, vented container rather than an open tank. These constraints are what typically force the choice between a 20' HC and a 40' HC before the flow calculation is finalised.

Procurement Checklist for Berlin Containerized MBR Projects

Send this list to vendors in the same email as the sizing outputs. A vendor who cannot answer every line is not yet qualified for a Berlin project.

• Form factor: 20' HC vs 40' HC; ISO transport certification (MENA-Water confirms seaworthy container design).
• Materials: stainless internal tanks (MENA-Water); PVDF membranes at 0.04 µm (Pure Aqua) or 0.1 µm flat-sheet (HydropureWater DF series).
• Controls: PLC with remote monitoring and alarm logging; confirm the SCADA protocol used.
• Electrical: Pure Aqua ships 460V/3Ph/60Hz by default — request 400V/3Ph/50Hz for Berlin and a transformer if needed.
• Compliance: EU UWWTD 91/271/EEC effluent envelope, German AbwV size class, CE marking, factory acceptance test (FAT) and site acceptance test (SAT) reports.
• Cold-weather package: insulated walls, enclosure heating trace, derated winter flux and a written cold-start procedure for Berlin winter conditions.
• Sludge and disinfection downstream: plate-and-frame filter press for dewatering; UV or chlorine dioxide generator for any reuse use case.
• Warranty, membrane replacement cycle and the 1-2 maintenance cleanings per year commitment (MENA-Water).

For cross-checking, the Prague sister guide and the Medellín sizing guide apply the same seven-input method to different climates and discharge regimes.

Frequently Asked Questions

How do I estimate the daily flow for a Berlin residential or camp project?

Multiply the design population by a per-capita flow taken from DWA-A 198 in litres per person per day, divide by 1,000 to get m³/day, and then apply a peak factor of 2-3× for residential or 4-5× for camp with simultaneous shower blocks. Do not use Pure Aqua's 50 gpd per capita as a direct input — that is a US sizing rule of thumb (Pure Aqua), and German per-capita values are quoted in L/p·d under DWA-A 198.

Which container size should I specify — 20' HC or 40' HC?

Match the derated daily flow against MENA-Water's benchmark that more than 1,200 m³/day can be treated in one 40' ISO container (MENA-Water), and against Pure Aqua's note that 40' and 20' HC container formats are available depending on capacity (Pure Aqua). For most Berlin residential and camp loads of 5-300 m³/day, a single 20' HC or 40' HC unit is sufficient, and the final pick is usually driven by site access and crane reach rather than hydraulics.

What does a containerized MBR cost for a Berlin project?

No published price exists in the supplied research, so request a written quote broken out by container, membrane modules, controls, electrical package (400V/3Ph/50Hz), cold-weather package, FAT/SAT, shipping to Berlin, and commissioning. Ask for membrane replacement cost and the annual cost of the 1-2 maintenance cleanings per year (MENA-Water) as separate line items, because those are the operating-cost line items that swing the lifecycle number.

How do I qualify a vendor for a Berlin permit submission?

Require evidence of EU UWWTD 91/271/EEC-compliant effluent, AbwV size-class coverage, CE marking, FAT and SAT reports, and a documented cold-weather derating procedure for winter sewage below the 20-30°C operating window (Pure Aqua). Confirm that the electrical package is 400V/3Ph/50Hz — Pure Aqua's default 460V/3Ph/60Hz is not Berlin-compatible — and that the container carries ISO transport certification. A vendor that cannot produce all of the above is not yet ready for a Senatsverwaltung or BWB submission.

Further Reading

• the Prague sister guide
• the Medellín sizing guide
• the modular STP specifications guide