What a containerized MBR actually delivers for a Tbilisi site
A containerized MBR is a pre-engineered, plug-and-play wastewater treatment plant built inside standard 20ft or 40ft ISO shipping containers, combining biological treatment with membrane filtration in one modular unit (wateracademia.com). Because the tankage, blowers, pumps and membrane cassette all sit inside the container, only water and power connections are required on site, and most civil works are eliminated — a useful property for both a permanent residential block on the outskirts of Tbilisi and a temporary worker camp near an Mtkvari construction front.
The design outputs that matter for a Tbilisi discharge permit are biochemical oxygen demand (BOD), total suspended solids (TSS), total Kjeldahl nitrogen (TKN) and ammonia, all of which the package produces well below typical discharge limits (Dynatec Systems). The designer should treat these four parameters as the contractual effluent envelope and require the supplier to demonstrate them against the actual Tbilisi effluent target before signing the purchase order. The container greatly simplifies installation and limits the need for additional civil work at the site (Dynatec Systems), which is a practical advantage where the laydown area is constrained by neighbouring housing or by an active construction site.
Multiple containers can be connected in parallel for higher flows (wateracademia.com), so the same architectural template scales from a 50 m³/day camp to a 500 m³/day residential cluster without changing technology. The two product references that anchor this guide are the integrated MBR membrane bioreactor system package and the DF series flat-sheet membrane module that sits inside it.
Step 1 — Convert the served population into an average daily flow
The first sizing step translates headcount into a hydraulic basis. Average daily flow (ADF) is calculated as population multiplied by a per-capita wastewater allowance expressed in litres per person per day, with 1 m³ equal to 1,000 L (IDA Water Security Handbook unit conventions). The per-day basis is the primary sizing basis used throughout the water industry, and converting into hourly average flow simply divides ADF by 24.
The scraped research does not publish a per-capita value that applies to Tbilisi, so the engineer must obtain this number from the project client or the local utility before the calculation can be locked down. The same caveat applies to occupancy pattern: a residential block has a relatively stable diurnal curve, while a worker camp concentrates kitchen, laundry and shower use into a narrow morning and evening window. The designer should ask the camp operator for an hourly profile rather than assume one.
Once ADF is established, the engineer carries it forward as the hydraulic basis for Steps 2, 3 and 4. The same four-step logic is used for both permanent residential blocks and temporary worker camps in Tbilisi; the difference is usually the peak factor and the redundancy requirement, not the technology. The Prague sizing guide applies the identical sequence and is a useful cross-check on the unit conversions, as described in the containerized MBR sizing methodology for Prague.
| Input | Symbol | Unit | Source in the scraped research | Tbilisi-specific value |
|---|---|---|---|---|
| Served population | P | persons | Project brief | Confirm with client |
| Per-capita wastewater allowance | q | L/person/day | Not provided in research | Request from local utility |
| Average daily flow | ADF | m³/day | Primary sizing basis (IDA Handbook) | ADF = P × q ÷ 1,000 |
| Hourly average flow | Q̅ | m³/h | Derived from ADF (IDA Handbook) | Q̅ = ADF ÷ 24 |
Step 2 — Apply a peak factor and check the organic load
The second step converts the daily average into a peak hydraulic load and an organic load, both of which the containerized MBR must absorb without breaching effluent quality. Peak hourly flow is ADF multiplied by a peak factor; the scraped research does not publish a value that applies to Tbilisi, so this coefficient is a required input and should be requested from the equipment supplier based on the camp or residential profile. Organic load is expressed in kilograms of BOD per day and is calculated as population multiplied by a per-capita BOD contribution in grams per person per day, divided by 1,000; the BOD contribution figure must be confirmed by influent sampling or against local guidance because it varies with diet and water-use habits.
For a camp, simultaneous kitchen, laundry and shower use typically drives a higher peak factor than a residential block, and this should be discussed with the supplier before fixing the container count. The biological reactor volume inside the packaged plant must be checked against the organic loading rate; this check is internal to the packaged plant and is normally demonstrated by the equipment supplier against the supplied design loads (Dynatec Systems), so the engineer's job is to specify the loads clearly and require the supplier to demonstrate compliance in writing.
Two derived figures should be carried forward: peak hourly flow in m³/h and organic load in kg BOD/day. The same calculation framework, with the same inputs flagged as items to confirm locally, is described for hospitality flows in the packaged MBR selection for hospitality projects guide.
| Derived figure | Formula | Unit | Source of the formula | Value to confirm for Tbilisi |
|---|---|---|---|---|
| Peak hourly flow | ADF × peak factor | m³/h | Standard hydraulics, not in research | Request from supplier |
| Organic load | P × BOD per capita ÷ 1,000 | kg BOD/day | Standard wastewater engineering | Request from local data |
| Volumetric loading check | kg BOD/day ÷ bioreactor volume | kg BOD/m³/day | Supplier demonstrates vs. design loads (Dynatec Systems) | Require supplier to demonstrate |
Step 3 — Choose between a 20ft and a 40ft container, and decide the parallel count
Containerized MBR systems are built in standard 20ft or 40ft ISO containers, so the choice between the two is driven by design flow per train and by site footprint rather than by any technology difference (wateracademia.com). The smaller container typically suits lower per-train flows and tighter sites, while the larger container carries more membrane area and a larger equalization volume; the exact flow split per container size is a vendor-specific input that is not contained in the scraped research, so the engineer should request a flow-per-container rating for both the 20ft and 40ft options from the supplier before committing.
Multiple containers can be connected in parallel for higher flows (wateracademia.com, scalability point), and this is the standard method for scaling a Tbilisi residential cluster beyond a single 40ft unit. The containerized 'plug & play' architecture simplifies installation and limits the need for additional civil work, which is a strong argument for Tbilisi sites with restricted laydown areas (Dynatec Systems). The number of parallel trains is set by dividing the design flow by the per-train flow, rounding up to the next whole container, and then deciding whether redundancy is required.
For a worker camp on a short project lifecycle, a single 40ft unit with a small standby train is often the most economical configuration. For a permanent residential block on the outskirts of Tbilisi, two parallel trains sized at 60–70% of peak flow each are usually specified, so that one train can be taken offline for membrane cleaning while the other continues to treat the full flow. The container is the integrated MBR membrane bioreactor system package, and the choice between 20ft and 40ft is purely a layout and hydraulics decision.
| Container option | Typical use | Scalability | Source |
|---|---|---|---|
| 20ft ISO container | Lower per-train flow, tight sites | Parallel for higher flows (wateracademia.com) | wateracademia.com |
| 40ft ISO container | Higher per-train flow, more membrane area | Parallel for higher flows (wateracademia.com) | wateracademia.com |
| Multiple parallel trains | Residential clusters above single-train capacity | Standard scaling method | wateracademia.com |
Step 4 — Verify the membrane area and module count
The final sizing step cross-checks the hydraulic design against the membrane spec. The number of membrane modules equals the design flow per train divided by the rated module flow; for HydropureWater's DF series flat-sheet modules, each module is rated between 32 and 135 m³/day depending on whether 80 m² or 225 m² of membrane area is selected (DF series product specification). The 0.1 μm PVDF membrane pore size acts as an absolute barrier to bacteria and most suspended solids, so the designer does not need to derate the membrane for TSS, but does need to confirm that the chosen membrane area delivers the rated flow at the design flux.
The integrated MBR product line spans 10–2,000 m³/day in a single skid (integrated MBR product specification), which brackets the typical Tbilisi residential and camp use cases. The out-of-basin membrane configuration allows simple addition of more membranes or membrane skids, supporting future capacity increases without re-engineering the bioreactor (Dynatec Systems), so the engineer should specify the membranes with future expansion in mind even if the first installation does not need the full area.
For a 300-person residential cluster, the design flow per train is roughly the cluster ADF divided by the number of parallel 40ft containers, and the module count for that train is that per-train flow divided by the chosen module rating between 32 and 135 m³/day. The membrane modules themselves are the DF series flat-sheet membrane module, and the verification should be done on a per-train basis so that the design can be repeated for every parallel container.
| Parameter | Value | Unit | Source |
|---|---|---|---|
| Membrane pore size | 0.1 | μm | DF series product specification |
| Membrane area per module | 80–225 | m² | DF series product specification |
| Rated flow per module | 32–135 | m³/day | DF series product specification |
| Integrated skid range | 10–2,000 | m³/day | Integrated MBR product specification |
| Module count per train | Per-train flow ÷ module rating | modules | Derived from above |
Tbilisi-specific inputs to confirm before freezing the design
Four local data points are not covered in the scraped research and must be requested from the project client or the local permitting authority before the design is frozen. The per-capita wastewater allowance, the peak factor and the influent BOD concentration for Tbilisi are not stated in the scraped sources, so the engineer should request these from the project client or local utility and document them in the design basis. Discharge or reuse limits for BOD, TSS, TKN, ammonia and fecal coliforms vary depending on whether the effluent goes to the municipal sewer, the Mtkvari, or an irrigation reuse path, and the applicable limits must be confirmed against the local permit framework rather than assumed from international defaults.
Tbilisi winter ambient temperatures affect biological activity and may require enclosure, heat tracing or deeper burial of connecting pipework; this is a site-specific input rather than a published number, and the engineer should discuss it with the supplier because membrane permeability and biological kinetics both shift with temperature. Containerized MBRs still need a coarse screen upstream, and the standard pairing is a mechanical bar screen such as the GX series rotary unit, which should be specified alongside the container in the RFQ.
The full scope of ancillaries to specify in the RFQ includes the screen, the container itself, the membrane modules, a sludge dewatering step, and a polishing disinfection stage where the discharge target requires it. Each of these is a separate line item in the supplier's quotation, and missing any one of them is the most common reason a containerized MBR is delivered incomplete.
Commissioning checklist for a containerized MBR in Tbilisi
The sizing exercise only delivers value if it is converted into a working hand-over document. Before delivery, the engineer should confirm the inlet and outlet pipework, ventilation and power rating on each container against the site survey; per wateracademia.com, only water and power connections are required, so any deviation is a red flag. On arrival, the engineer should verify that the membrane module count matches the Step 4 calculation and that spare modules are stored on site for the first 12 months of operation, because the first year typically sees more cleaning events than subsequent years.
During commissioning, the engineer should define an effluent monitoring schedule for BOD, TSS, TKN and ammonia against the targets documented in Step 1, which Dynatec Systems confirms are the design outputs of the package. The membrane bioreactor produces a smaller waste sludge volume than conventional activated sludge, but a dewatering step is still required and can be served by a plate and frame filter press. Where the discharge target requires it, a UV sterilizer can be added as a polishing step to bring fecal coliform counts below the limit without chemicals.
Useful ancillaries to specify alongside the container in the RFQ include a plate and frame filter press for sludge dewatering and a UV sterilizer for effluent polishing. Both items appear in the standard HydropureWater product range and are typically quoted as options rather than included in the base container price.
Frequently Asked Questions
How much does a containerized MBR STP for a 300-person residential block in Tbilisi typically cost?
The scraped research does not publish a price for a Tbilisi residential or camp installation, so the engineer should request a quotation from the supplier with the Step 1–4 outputs attached: ADF, peak hourly flow, kg BOD/day, container count and module count. The supplier's quotation should itemise the container, the membrane modules, the pre-treatment screen, the sludge dewatering unit and the optional UV polishing stage as separate lines so that cost can be compared against the design basis.
How do I select a supplier for a containerized MBR in Tbilisi?
The engineer should require the supplier to demonstrate, in writing, that the proposed container count and module count will meet the BOD, TSS, TKN and ammonia targets defined in the project discharge permit, and that the membrane modules supplied are the 0.1 μm PVDF DF series flat-sheet units rather than a generic alternative. The supplier should also be asked to provide a reference installation of similar size and climate, and to confirm in the quotation that the unit is built in a standard 20ft or 40ft ISO container as described in the product specification.
How does a Tbilisi winter affect the containerized MBR design?
Low ambient temperatures slow biological kinetics and reduce membrane permeability, so the engineer should discuss enclosure, heat tracing or burial of connecting pipework with the supplier before the design is frozen. The supplier should be asked to confirm the minimum operating temperature for the biological reactor and for the membrane cassette, because the Tbilisi winter floor temperature is a project input that is not stated in the scraped research.
What discharge parameters must the containerized MBR meet for a Tbilisi discharge permit?
The discharge permit typically sets limits on BOD, TSS, TKN, ammonia and fecal coliforms, and these are the four to five parameters the engineer should require the supplier to demonstrate in writing (Dynatec Systems confirms BOD, TSS, TKN and ammonia as the package outputs). The exact numerical limits depend on whether the effluent goes to the municipal sewer, to the Mtkvari, or to an irrigation reuse path, and the engineer must confirm the applicable limits against the local permit framework rather than assume an international default.
