Sizing a Containerized MBR STP for Guayaquil Projects: 2026 Guide

What 'sizing' a containerized MBR actually means in Guayaquil

Sizing a packaged sewage treatment plant is a chain of four engineering decisions that must be locked down before a supplier can quote a price. The decisions are design flow in m³/d, organic and nitrogen load on the biology, the count of 20' or 40' high-cube ISO containers, and the permeate quality target against which the unit will be commissioned. Treating the question as "which model number?" skips the first three and leads to either an oversized container or an overloaded membrane tank once the camp is occupied.

For Guayaquil coastal projects, the Pure Aqua MBR-C data sheet (OCT2018) anchors the chain: it ties design flow to population at 50 gpd per capita, lists feed water at BOD 250 mg/L, COD 400 mg/L, TSS 200 mg/L and NH4-N 30 mg/L, and gives expected permeate at <10 mg/L BOD, <5 mg/L TSS and <2 mg/L NH4-N through 0.04 µm PVDF hollow-fiber membranes. The same data sheet gives an operating temperature range of 20-30°C with a design point of 20°C, which is the first place a Guayaquil project has to be checked. The data sheet also lists 460V/3Ph/60Hz as a standard supply and standby pumps for redundancy as a standard feature, both of which matter on the Ecuadorian coast. Per Dynatec's product page, containerized MBR is sold as a "Plug & Play" package where mobility, fast installation, and reuse of existing civil works are core design drivers — which fits temporary workers' camps and hospitality sites around Guayaquil where the unit may be relocated when the project closes.

Step 1: Build the design flow from the population or camp occupancy

The calculation starts with the headcount the camp or community will carry at peak, not the nominal housing capacity. A 200-room workers' camp at 100% occupancy with overlapping shower, laundry and kitchen windows generates a higher instantaneous flow than a 200-room residential block where occupants are staggered across the day. The Pure Aqua MBR-C data sheet (OCT2018) sizes its four reference units at 50 gpd per capita — 50, 100, 150 and 190 m³/d — so the first translation is always headcount × 50 gpd.

Layer a peaking factor on top to capture simultaneous use. For a residential community on the Guayas coast where daytime occupancy approaches 100% and old sewers admit infiltration during heavy rain, a conservative peaking factor — to be confirmed with the local operator — should be applied before the flow is converted to m³/d. The same logic applies to a workers' camp where the shift change, dinner service and laundry cycle all hit the network inside a 90-minute window. Convert the peak daily flow to m³/d (1 m³ = 264.2 US gallons) and check it against the four MBR-C lineup thresholds before moving to the next step.

For a hybrid project — residential blocks plus a small commercial kitchen, a clinic, or a laundromat — add the commercial load on top of the residential base before sizing. Kitchen flows carry oil and grease that change the organic load rather than just the hydraulic load, and that is a Step 2 problem, so the hydraulic calculation should be settled first.

Step 2: Lock the influent load and the permeate target

Sizing hydraulically without checking the organic load is the most common mistake on Guayaquil camp projects. The biology has to metabolize the BOD, COD and ammonia actually arriving at the membrane tank, not a textbook domestic average. The MBR-C feed design from the OCT2018 data sheet is the starting point.

If the camp includes a kitchen with high oil and grease, or worker housing with weekday under-occupancy that swings to full on the rotation weekend, the supplier should be asked to re-rate BOD and COD rather than accept the default 250/400 mg/L envelope. The permeate target depends on what the water is used for next. Surface discharge in Ecuador follows the TULSMA Libro VI Anexo 1 normative. Irrigation reuse typically needs the lower NH4-N band the MBR-C already produces (<2 mg/L). For potable reuse, the MBR is only a pre-treatment step — downstream RO or advanced oxidation is required, which is a separate process train and a separate cost line.

Step 3: Match flow to container count using the MBR-C reference

With a defensible peak flow and an organic load confirmed against the feed envelope, the MBR-C reference lineup turns the calculation into a specific, orderable container configuration. The data sheet (OCT2018) lists four stock units built on 316 SS skids with TIPS-spun PVDF hollow-fiber membranes at 0.04 µm nominal pore size, all in 20' or 40' high-cube ISO containers with insulated walls, zero water-leakage structure and seaworthy rating — which simplifies export through Guayaquil's port and crane handling on a coastal site.

If the design flow falls between two MBR-C steps, the conservative move is to upsize to the next 40' container rather than push the higher one to its limit. Leaving a module spare also gives the operator a slot to bring online when the camp expands or when one skid is offline for chemical cleaning. For a project like the Guayaquil residential or camp case, a comparable skid-mounted HydropureWater MBR membrane bioreactor system should be evaluated against the same 50 gpd-per-capita envelope and the same permeate targets before a container count is committed.

Step 4: Apply Guayaquil-specific corrections before you order

Site conditions on the Guayas coast change the requirements even after the container count is set. The high water table in the Guayas lowlands can conflict with buried pipework, so the supplier should confirm that the containerized MBR sits above ground on a plinth or trailer — which is already a Pure Aqua MBR-C standard feature. Ambient air at 24-30°C sits at the top of the MBR-C operating band of 20-30°C with a design point of 20°C, so the engineer should verify with the supplier that blower sizing and membrane aeration are rated for sustained tropical duty. Below that band the biology slows; above it, oxygen transfer falls.

Power quality on the Ecuadorian coast is variable. The MBR-C standard supply is 460V/3Ph/60Hz, so site voltage and phase need to be confirmed before shipment, and the standby pump philosophy needs to match the operator's maintenance capacity. Tropical rainfall can push short-term flow well above the daily average, so a small equalization buffer upstream of the MBR container should be specified rather than relying on the membrane tank to absorb a peak that was never in the design envelope. For nutrient-sensitive discharges, the project's nitrogen and phosphorus envelope should be cross-checked against an advanced nutrient removal construction guide before the permeate target is signed off. A useful benchmark for an inland comparison is the sizing methodology used for Medellín projects, which uses the same MBR-C reference but with different ambient and grid assumptions.

Frequently Asked Questions

How many people will a single 20' or 40' containerized MBR serve in Guayaquil?

On the Pure Aqua MBR-C reference (data sheet, OCT2018), a single 20' container serves roughly 265 people at 50 m³/d, a single 40' container serves about 529 people at 100 m³/d, the next 40' step serves about 793 people at 150 m³/d, and the largest stock 40' unit serves about 1,004 people at 190 m³/d. For a Guayaquil project, apply a coastal peaking factor on top of the headcount before matching to the lineup.

What does a containerized MBR cost for a Guayaquil camp, and how should I compare suppliers?

No published price for a containerized MBR was identified, so a defensible budget cannot be built from a number in this guide. Ask each supplier for a line-item quote that names the reference model (for example, MBR-C-26.4K-10 at 100 m³/d), the feed envelope it is rated against, the permeate targets it commits to, the container count and the electrical and civil assumptions. Comparing on those five lines is more reliable than comparing on a single lump-sum figure.

What effluent quality is needed for discharge or irrigation reuse in Ecuador?

Surface discharge in Ecuador follows the TULSMA Libro VI Anexo 1 normative; irrigation reuse typically targets the lower NH4-N band. The MBR-C reference permeate of <10 mg/L BOD, <5 mg/L TSS and <2 mg/L NH4-N (data sheet, OCT2018) is the engineering baseline to be checked against the specific TULSMA table that applies to the discharge point. Confirm with the local environmental authority which table and which receptor water body apply before committing.

Can the same containerized MBR be moved if the camp is temporary?

Yes, mobility is a core design driver. Per Dynatec's product page, containerized MBR systems are built as a "Plug & Play" package that can be relocated with relative ease and limits additional civil work at the site. The MBR-C containers are 20' or 40' high-cube ISO with seaworthy rating, which is the same envelope used for export through Guayaquil's port. Plan crane access and a hardstand at both the original and the destination site before the unit is commissioned.

What maintenance and consumables should a non-technical buyer plan for?

The MBR-C process (data sheet, OCT2018) uses chemical cleaning and air scouring to control fouling, daily sludge wasting to hold the SRT, and standby pumps for redundancy. Ask the supplier for the cleaning-chemical consumption per membrane module per year and the expected daily sludge volume, and confirm the local availability of those chemicals and a sludge handling route before the container is delivered.

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