Sizing a Containerized MBR STP for Hanoi Residential & Camp Projects (2026 Guide)

What a Containerized MBR STP Is and Why It Fits Hanoi

A membrane bioreactor (MBR) combines biological treatment with membrane filtration in a single tank train, and MENA-Water states that this configuration "is a wastewater treatment process combining membrane filtration with biological treatment," with the membrane step achieving bacterial and viral reduction of 99.9999% (mena-water.com). When that process is packaged into an ISO container it becomes a containerized MBR membrane bioreactor system that can be lifted onto a Hanoi construction site with a standard truck and commissioned in days rather than months.

Two formats from the SERP research matter for Vietnam. MENA-Water's fully integrated I-Version is an "ideal choice" for "mobile applications or if the plants need to be shifted to new locations" (mena-water.com), which matches Hanoi's relocatable construction and worker camps. The U-Version puts aeration and buffering in underground water tanks (mena-water.com), which suits dense Hanoi residential compounds where above-ground footprint is constrained. The temperature envelope is also favourable: Pure Aqua's MBR-C datasheet lists an "Operating temperature range: 68-86°F (20-30°C)" and a "Design temperature: 68°F (20°C)" (pureaqua.com), and Hanoi's annual sewage temperature sits inside that band for most of the year.

Before any sizing exercise, the engineer must collect: population served, per-capita water demand, peak factor, influent BOD/COD/TSS, target effluent quality under QCVN 14:2008/BTNMT, and site electrical supply. These inputs convert population into a defensible container specification.

Step 1 — Convert Population and Per-Capita Demand into Average Daily Flow

The sizing starts from population, multiplying by the project's per-capita water demand and dividing by 1,000 to get cubic metres per day. Pure Aqua's MBR-C reference population is calculated at "50 gpd per Capita" (pureaqua.com), and the IDA Water Security Handbook 2020-2021 (p.ii) confirms that "1 cubic metre (m³) = 264.2 US gallons or 1,000 litres." A worked skeleton for a 500-person residential cluster, using a per-capita value the engineer must verify from the project's water-supply data, is:

Average daily flow (ADF, m³/day) = 500 people × Lpcd ÷ 1,000

The 50 gpd per capita figure on Pure Aqua's datasheet is the supplier's sizing assumption for the North American market; the SERP research does not quote a Hanoi-specific Lpcd. The engineer must replace it with a value taken from the project's actual water-supply records or from a Vietnam-specific reference to avoid an overstatement of demand. Two further adjustments convert ADF into the design flow that the container must handle. First, a peak factor for the peak hour: camp installations typically apply a 1.5–2.0× multiplier on top of ADF, while Hanoi apartment blocks sit closer to 1.3–1.5×. Second, Hanoi's monsoon season can drive infiltration and inflow into the collection network; the engineer should add a separate percentage buffer for wet-weather flow and confirm it against the project's hydraulic survey.

Step 2 — Convert the Flow into Organic and Nutrient Loads

Hydraulic capacity is only half the check, as the biological train must also accept the organic load, expressed as kilograms of BOD per day:

BOD load (kg/day) = ADF (m³/day) × influent BOD (mg/L) ÷ 1,000

The influent BOD is a project-specific input; the engineer must supply it from influent sampling or a local design guideline. Once the load is known, the supplier selects the aeration tank volume to hit a target hydraulic retention time (HRT). The reader should request the supplier's HRT curve and MLSS operating window as part of the technical questionnaire.

Nutrient removal matters because QCVN 14:2008/BTNMT controls total nitrogen on domestic discharges. Pure Aqua's MBR-C includes an "Anoxic zone to achieve denitrification (NO3 removal)" (pureaqua.com), so the engineer should confirm that the offered container has a dedicated anoxic compartment and recirculation line, not just an aerobic membrane tank. The flux and mixed liquor suspended solids (MLSS) are engineering inputs the supplier will provide.

Step 3 — Match Flow and Load to a 20-ft or 40-ft Container Format

Once the ADF and load are fixed, the container format follows the flow. MENA-Water's capacity anchor is that "more than 1200 m³/day can be filtered in one 40-feet ISO container" (mena-water.com); for Hanoi residential and camp projects that sit below that benchmark, a 20-ft high-cube (HC) container is the typical starting point. Pure Aqua confirms that MBR-C is built into "40' and 20' high cube (HC) containers depending on capacity," with "Insulated container walls," "Enhanced container structure," and "Seaworthy container" as standard (pureaqua.com). Larger residential clusters or multi-cluster camps step up to one or more 40-ft units rather than overloading a single 20-ft skid.

Format selection also depends on mobility. A U-Version with underground buffer tanks (mena-water.com) is more appropriate for permanent Hanoi residential compounds where the above-ground envelope is the constraint. MBR membrane modules inside the container can be specified as hollow-fibre (Pure Aqua's "submerged HF membrane modules," pureaqua.com) or as flat-sheet units such as the DF series flat-sheet MBR membrane module; the choice affects air-scour demand and recovery-from-fouling performance. Vietnam's grid is 380V/3Ph/50Hz, so the engineer must request a 50 Hz variant from the supplier or confirm that the offered container is built for the local mains before placing the order.

Step 4 — Pre-Treatment, Post-Treatment, and Sludge Handling

The container is not a stand-alone plant. Pure Aqua's MBR-C "passes through a drum screen to mitigate suspended solids and protect membranes' surface," with a "1.5 mm perforation" drum screen (pureaqua.com). That screen typically sits upstream of the container in a small civil works head, often paired with a rotary mechanical bar screen for larger flows. Inside the container, an "Aeration tank with fine bubble diffusers for biomass growth" and "Submerged HF membrane modules equipped with coarse bubble diffusers" handle aeration and membrane scouring (pureaqua.com).

Membrane maintenance is light. MENA-Water states that "the membranes don't need regular chemical cleaning except one or two maintenance clearings per year" (mena-water.com), so the operator should plan a clean-in-place (CIP) dosing station and roughly two CIP campaigns per year. Downstream of the membrane tank, a disinfection step is required to meet QCVN 14:2008/BTNMT coliform limits; the reader should size a UV or chlorine dioxide unit and confirm the target with the local authority. Sludge from the MBR waste stream is normally dewatered on site using a sludge dewatering filter press before disposal.

Containerized MBR Sizing Parameter Table for Hanoi

The table below consolidates the data points supported by the research and flags the inputs the engineer must collect from the project.

Buyer's Checklist Before Requesting a Quote in Hanoi

Send the supplier the following as a single RFQ package so the offer is comparable against competing bids: design population, average and peak daily flow, influent BOD/COD/TSS/NH3, target effluent quality under QCVN 14:2008/BTNMT (Column A or B as advised by the local authority), available footprint and voltage, and the desired container format (20-ft HC, 40-ft HC, or multiple 40-ft units). For relocatable camps, state that the I-Version mobile format is required. Specify the membrane type: 0.04 µm PVDF hollow-fibre UF (pureaqua.com) or a flat-sheet equivalent such as HydropureWater's 0.1 µm DF series modules, and request standby pumps for redundancy.

Confirm climate fit against Pure Aqua's 20–30°C operating envelope (pureaqua.com); Hanoi's annual sewage temperature sits inside that band, but the engineer should still request ventilation or insulation if the container will sit in direct tropical sun. Confirm after-sales scope: membrane cleaning cadence of "one or two maintenance clearings per year" (mena-water.com), CIP chemical supply, and a remote-monitoring option. Disinfection downstream of the MBR should be specified as either a UV sterilizer for water treatment or a chlorine dioxide generator, sized to the effluent coliform target the local authority sets under QCVN 14:2008/BTNMT.

Frequently Asked Questions

What average daily flow can a single 20-ft vs 40-ft containerized MBR handle in Hanoi?

MENA-Water's published anchor is "more than 1200 m³/day can be filtered in one 40-feet ISO container" (mena-water.com). The 20-ft HC container offered in the same product family is the lower-capacity variant; the engineer must request the supplier's flow curve for that format. For larger Hanoi residential clusters, multiple 40-ft units are used in parallel rather than overloading a single skid.

What effluent parameters does a containerized MBR need to meet under QCVN 14:2008/BTNMT for residential or camp discharge?

Vietnam's QCVN 14:2008/BTNMT sets domestic wastewater discharge limits. The engineer must confirm the applicable column and the local authority's expected targets (BOD, COD, TSS, total nitrogen, total phosphorus, coliforms) before finalizing the disinfection and nutrient-removal stages.

What are the typical lead time and cost drivers for a containerized MBR in Vietnam?

The engineer should request a quotation that itemizes the container, the membrane modules, the