Why Sizing a Containerized MBR STP in Nagoya Is a Local Problem
The most detailed public reference for a containerized MBR is the Pure Aqua MBR-C data sheet, which uses 460V/3Ph/60Hz and a 20–30°C operating window with 20°C design temperature (Pure Aqua, 2018-10 data sheet). None of those numbers apply as-is in Nagoya, where the utility supplies 200V or 400V class at 50Hz and the January mean ground temperature falls to around 4°C. Translating the US-spec sheet into a buildable Japanese specification is the real engineering task, and it is one no competitor page addresses.
The PHILOS MBR Containerized System confirms that a 50 m³/day single-container MBR has been used for construction-camp duty including kitchen waste (PHILOS, product page), which validates the form factor but still leaves the Japan-localization work to the engineer. Aichi-specific discharge limits, JIS pipe and material norms, and Japanese per-capita flow conventions are absent from every datasheet this article draws on, so the engineer has to add them by hand. That gap is what turns a model selection into a defensible RFQ.
The Four Inputs You Need Before Picking a Model
Before any model number is shortlisted, four numbers have to be on the table: design population, per-capita sewage flow, peaking factor, and influent load. Population is project-specific — a 200-person construction camp, a 50-unit residential block with roughly 150 residents, and a dormitory each produce a different design population that the rest of the calculation hangs on.
Per-capita flow is not a universal constant. The Pure Aqua sizing table uses 50 gpd per capita, which is approximately 190 L/person/day (Pure Aqua, 2018-10 data sheet). Japanese sewerage planning typically uses higher per-capita values for residential, and the project-specific figure should be confirmed against the local authority's planning guidance rather than copied from a US sheet.
A peaking factor of 1.2–1.5× must be applied to average daily flow so the membrane tank can absorb peak-morning surges without overflowing; omitting it is the most common reason a correctly-rated model under-performs in service. Influent load assumptions (BOD, COD, SS, NH4-N) are needed to confirm the biological stage can handle the waste strength, especially for camps with kitchen waste, which PHILOS explicitly includes in its 50 m³/day design (PHILOS, product page).
Step-by-Step Sizing Methodology for a Nagoya Project
The methodology below is a four-step calculation. The two worked examples use the Pure Aqua MBR-C published values (2018-10 data sheet) only where the MBR-C value is the explicit fact under use; per-capita and peaking inputs are flagged as inputs the engineer must confirm against Japanese planning norms.
- Step 1 — Design flow. Q_design = population × per-capita flow × peaking factor. Example A (200-person camp): 200 × 190 L/p/d × 1.3 ≈ 49,400 L/day ≈ 49.4 m³/day, which maps to the MBR-C-13.2K-06 at 50 m³/day in a single 20' HC container. Example B (50-unit residential block, ~150 residents): 150 × 250 L/p/d × 1.3 ≈ 48,750 L/day ≈ 48.75 m³/day, again a 50 m³/day class unit. Both calculations should be re-run with the project-specific Japanese per-capita figure the local authority confirms.
- Step 2 — Container selection. The MBR-C line offers 50 m³/d in 1 × 20' HC and 100 / 150 / 190 m³/d in 1 × 40' HC (Pure Aqua, 2018-10 data sheet). Match the design flow to the nearest equal-or-larger model, never the nearest smaller one, because membrane flux derating at peak load will eat the safety margin.
- Step 3 — Effluent spec. Confirm permeate targets against the Nagoya City Sewerage Ordinance for the specific receiving body. MBR-C is published at BOD <10 mg/L, COD <50 mg/L, TSS <5 mg/L, NH4-N <2 mg/L (Pure Aqua, 2018-10 data sheet). For T-N and T-P controlled discharge, the base anoxic zone plus an optional chemical P-removal module (Skyview) is the published route to compliance.
- Step 4 — Site and electrical fit. Confirm 20' or 40' HC footprint, truck access for delivery, headroom for crane lift, and that the container is rated zero leakage with insulated walls (Pure Aqua, 2018-10 data sheet). Electrical re-spec to 200V or 400V / 3Ph / 50Hz is non-negotiable for Nagoya and must be confirmed in writing before PO.
| Step | Input / Output | 200-person camp | 50-unit residential (~150 residents) |
|---|---|---|---|
| 1. Design flow (Q_design) | m³/day | 49.4 (200 × 190 × 1.3) | 48.75 (150 × 250 × 1.3) |
| 2. Container selection (MBR-C reference) | Model / container | MBR-C-13.2K-06, 1 × 20' HC | MBR-C-13.2K-06, 1 × 20' HC |
| 3. Permeate envelope (MBR-C published) | mg/L | BOD <10, COD <50, TSS <5, NH4-N <2 | Same envelope; verify T-N/T-P vs. Nagoya ordinance |
| 4. Site and electrical | Re-spec required | Insulated walls, 200V/3Ph/50Hz | Insulated walls, 200V/3Ph/50Hz |
Matching a Containerized MBR to Your Flow Range
The MBR-C published range covers four discrete sizes — 50, 100, 150, and 190 m³/day — meaning any Nagoya project between roughly 40 and 190 m³/day fits a single 20' or 40' HC container without custom engineering (Pure Aqua, 2018-10 data sheet). Below ~40 m³/day (small residential clusters, boutique camps), the 50 m³/day model is the smallest published size; projects above ~190 m³/day require either parallel units or a custom build, and Skyview explicitly markets a module database for such one-off designs (Skyview, product page).
Each MBR-C skid uses 2 membrane skids on 316 stainless frames, with module count scaling from 3 (50 m³/d) to 10 (190 m³/d) (Pure Aqua, 2018-10 data sheet). That module count is the right input for spare-parts planning — order spares as a percentage of installed modules, not as a flat number. For a sizing conversation, the engineer should treat the table below as a shortlist filter, not as a final selection.
| Model | Flow (m³/day) | Population @ 50 gpd/cap | Skids × Modules | Container |
|---|---|---|---|---|
| MBR-C-13.2K-06 | 50 | 265 | 2 × 3 | 1 × 20' HC |
| MBR-C-26.4K-10 | 100 | 529 | 2 × 5 | 1 × 40' HC |
| MBR-C-39.6K-16 | 150 | 793 | 2 × 8 | 1 × 40' HC |
| MBR-C-50.2K-20 | 190 | 1,004 | 2 × 10 | 1 × 40' HC |
For projects where the Pure Aqua MBR-C envelope does not match, the HydropureWater integrated MBR system range should be evaluated against the same Step-1 design flow.
Japan-Specific Specs You Must Change Before Ordering
This is the section that turns a copy-pasted US spec sheet into a Japan-spec build. Four deltas have to be written into the RFQ before any price request goes out.
Electrical supply. MBR-C standard is 460V/3Ph/60Hz (Pure Aqua, 2018-10 data sheet). Nagoya utility supply is 200V or 400V class at 50Hz, so the container must be re-specified to 200V/3Ph/50Hz (or 400V/3Ph/50Hz for larger builds) and confirmed in writing before PO. A 60Hz motor on 50Hz supply will overheat and draw higher current; this is not a commissioning tweak, it is a build-time re-spec.
Ambient temperature. MBR-C operating window is 20–30°C with 20°C design (Pure Aqua, 2018-10 data sheet). Nagoya January ground temperatures are regularly in single digits and sub-zero nights are normal, so the container must be supplied with insulated walls (S1/S5 lists this as standard), trace heating on piping, and possibly an enclosure or building skin to keep mixed liquor above roughly 10°C for stable nitrification. The PHILOS containerized system ships with an air-conditioned operator room as standard (PHILOS, product page), which is a useful reference for how a Japan-spec build handles winter duty.
Discharge compliance. The published MBR-C envelope (BOD <10, COD <50, TSS <5, NH4-N <2 mg/L) (Pure Aqua, 2018-10 data sheet) is the starting point, not the answer. The Nagoya City Sewerage Ordinance limits for the specific receiving connection — typically covering BOD, SS, T-N, and T-P — must be obtained from the local authority, and T-N / T-P may require the Skyview-style chemical P-removal or ozone post-treatment option (Skyview, product page) on top of the base anoxic denitrification zone (Pure Aqua, product page).
Per-capita flow. The 50 gpd (≈190 L/p/d) basis in Pure Aqua's sizing table (Pure Aqua, 2018-10 data sheet) is US-residential; Japanese design flows for residential sewerage are typically higher, so re-run the Step-1 calculation with the project-specific Japanese figure rather than copying Pure Aqua's. The local authority's planning division is the only source that should be quoted in the RFQ.
Camp-Specific vs. Residential-Specific Design Tweaks
Construction camps generate kitchen waste and shift-work load swings, and PHILOS's 50 m³/day reference design includes kitchen waste handling (PHILOS, product page), which pushes influent BOD/COD and FOG loading higher than a pure residential dormitory at the same population. Skyview lists FOG content (fat, oil, and grease) explicitly as a feed parameter (Skyview, product page), which is a useful prompt to confirm the kitchen-waste pre-treatment scope in the RFQ.
For residential blocks, the load profile is more uniform but nighttime low-flow periods are long, so the aeration system has to turn down to avoid over-aeration at low load. Skyview's fully automatic PLC control is the published reference for this (Skyview, product page). Both duty cases benefit from MBR-C's standby pump for redundancy and remote monitoring (Pure Aqua, 2018-10 data sheet), both of which are useful for unattended Nagoya sites. If the project needs to swap in a Japan-spec skid, the HydropureWater DF-series MBR membrane module is a candidate to evaluate against the published SMM module count.
Pre-Spec Sizing Checklist for a Nagoya RFQ
Hand this list to procurement. Anything not ticked off is a question for the supplier, not an assumption to make in-house.
- Population, per-capita flow basis (with Japanese local-authority figure, not US 50 gpd), peaking factor used, and calculated Q_design in m³/day, matched to the nearest equal-or-larger MBR-C reference model (Pure Aqua, 2018-10 data sheet).
- Required permeate quality vs. the Nagoya City Sewerage Ordinance — BOD, COD, SS, T-N, T-P limits for the specific receiving connection, obtained from the local authority.
- Container size (20' or 40' HC), site footprint, truck and crane access, and insulated-wall requirement for winter operation (Pure Aqua, 2018-10 data sheet).
- Electrical re-spec to 200V or 400V / 3Ph / 50Hz — the MBR-C default 460V/3Ph/60Hz will not work in Nagoya (Pure Aqua, 2018-10 data sheet).
- Optional modules required: chemical P-removal, air flotation, ozone, enhanced PLC/SCADA (Skyview, product page) — for camp duty, kitchen-waste handling (PHILOS, product page) — for residential, low-flow turndown control (Skyview, product page).
- Aftertreatment / sludge handling scope: whether the project also needs a sludge dewatering step. The HydropureWater plate and frame filter press pairs with MBR systems for that scope; for a Japan-market context, cross-check the MBR selection against HydropureWater's Japan MBR market guide.
Frequently Asked Questions
What is a realistic budget envelope for a 50 m³/day containerized MBR in Nagoya?
Published list pricing for a US-spec MBR-C-13.2K-06 at 50 m³/day was not present in the supplied research, so a budget figure cannot be quoted here. What a buyer should request from each shortlisted supplier is an itemised quote covering (a) the Japan-spec electrical re-spec to 200V or 400V / 3Ph / 50Hz, (b) insulated walls and trace heating for Nagoya winter duty, and (c) any optional modules (chemical P-removal, ozone, PLC/SCADA) required to meet the Nagoya City Sewerage Ordinance for the specific receiving connection. Comparing those three line items across suppliers is the defensible way to budget, rather than anchoring on a sticker price.
How do I confirm a containerized MBR supplier can actually deliver to a Nagoya site?
Request three documents before PO: a written confirmation that the container is built to 200V or 400V / 3Ph / 50Hz (not the MBR-C default 460V/3Ph/60Hz) (Pure Aqua, 2018-10 data sheet), a thermal design note showing mixed-liquor temperature stays above ~10°C at Nagoya January design ambient, and a permeate compliance matrix mapping the published BOD <10 / COD <50 / TSS <5 / NH4-N <2 mg/L envelope (Pure Aqua, 2018-10 data sheet) against the Nagoya City Sewerage Ordinance limits for the receiving body. A supplier that cannot produce all three is not yet ready to quote on a Japan-spec build.
Can a single 20' HC container really handle a 200-person camp?
Yes, on the published Pure Aqua reference: the MBR-C-13.2K-06 is rated 50 m³/day in a 1 × 20' HC container, sized against 50 gpd per capita (Pure Aqua, 2018-10 data sheet), and PHILOS confirms 50 m³/day single-container builds are in service for construction camps with kitchen waste (PHILOS, product page). The two qualifications are that (a) the per-capita flow basis must be re-confirmed against Japanese planning norms before sizing, and (b) the influent BOD/COD/FOG load from kitchen waste has to be inside the design envelope — if it is not, add the Skyview pre-treatment modules (Skyview, product page) rather than oversizing the container.
What about projects above 190 m³/day — do I just put two containers side by side?
Paralleling two 190 m³/day MBR-C-50.2K-20 units to reach 380 m³/day is mechanically possible — each unit is a self-contained 1 × 40' HC skid (Pure Aqua, 2018-10 data sheet) — but the hydraulic balance, shared header piping, and combined SCADA have to be engineered as one system, not two. For flows above the MBR-C envelope, the Skyview module database is the published route to a one-off custom build (Skyview, product page), and the HydropureWater integrated MBR system should be evaluated against the same Step-1 design flow. For a worked example of a similar exercise outside Japan, the Bandung containerized MBR sizing guide and the Jakarta containerized MBR sizing guide walk through the same four-step methodology with different climate and electrical inputs.
