Why San Antonio Hotels Need a Packaged MBR in 2026
A packaged MBR STP for a San Antonio hotel in 2026 is a factory-built, containerized membrane bioreactor that combines activated sludge with submerged PVDF membranes (typically 0.1 μm pore size) to deliver reuse-quality effluent in roughly 60% less space than conventional plants. Size it at 0.8-1.2 m³ per available room per day, add a 2.0-2.5× peak factor, and confirm the design meets TCEQ 30 TAC §285 (reuse) or 30 TAC §305 (TPDES) before procurement.
Two compliance tracks dominate San Antonio hotel projects. The first is the TPDES permit under 30 TAC §305.41-§305.53, which governs surface or irrigation discharge with effluent limits that membrane bioreactors routinely exceed. The second is on-site wastewater and reuse under 30 TAC §285, used when the plant feeds toilet flush, landscape irrigation, or cooling-tower makeup. A third overlay — the Edwards Aquifer Authority recharge zone rules in 30 TAC §213 — applies to most of north Bexar County, where any discharge over the recharge feature effectively requires a zero- or near-zero-pollutant design, the same envelope MBR reuse effluent achieves. Where the hotel discharges to the municipal sewer instead, San Antonio Water System (SAWS) pretreatment limits apply and the design must hold fats/oils/grease to ≤200 mg/L and pH to 6.0-9.0 per the current SAWS commercial ordinance.
Footprint is the second driver. Downtown and River Walk parcels rarely allow a conventional aeration basin, and a packaged integrated MBR membrane bioreactor system ships in a 40-ft container form factor (per Smith & Loveless TITAN MBR QUBE spec) and arrives pre-plumbed and pre-wired. For scale, the Imemflo hollow-fiber MBR installed at a 200-bed five-star hotel runs at 250 m³/day, and most San Antonio select-service and full-service properties fall in the 100-400 m³/day band — a range a single QUBE or two parallel QUBEs covers without civil basin construction.
Sizing the MBR: Flow, Load, and Peak Factor for a Hotel
Defensible hotel sizing starts at 0.8-1.2 m³ per available room per day for guest occupancy, then layers amenity flows on top. Add 0.05-0.10 m³/cover/day for food and beverage seating, 0.10-0.20 m³/room/day where on-site laundry operates, and 0.02-0.05 m³/room/day for pool backwash. Apply a peak hourly factor of 2.0-2.5× to capture the morning shower block and banquet turnover, and confirm the equalization/buffer tank inside the package holds at least 25% of daily flow so the membranes never see a hydraulic slug. Build in a 20% design safety margin above calculated average daily flow to absorb occupancy growth over the 10-15 year design life.
Biological load drives aeration tank volume and membrane area. Typical hotel influent runs BOD₅ 250-400 mg/L, COD 500-900 mg/L, TSS 200-400 mg/L, and FOG 50-150 mg/L — ranges consistent with commercial hospitality data and the Imemflo hotel wastewater reference. The packaged plant should target mixed liquor suspended solids (MLSS) of 8,000-12,000 mg/L in the MBR zone, with a food-to-mass ratio (F:M) of 0.05-0.15 kg BOD/kg MLSS·day to keep sludge young and fouling low.
If flow grows beyond the first unit's envelope, scale by parallel-coupling identical QUBE-style containers rather than oversizing one tank; Smith & Loveless documents that "multiple units are easily integrated to operate in parallel" for exactly this case.
| Parameter | Unit | Typical Hotel Range | Design Recommendation |
|---|---|---|---|
| Guest flow | m³/room/day | 0.8-1.2 | Use 1.0 for full-service, 0.85 for select-service |
| F&B flow | m³/cover/day | 0.05-0.10 | Use 0.08 if F&B seating > 1.5× keys |
| Laundry flow | m³/room/day | 0.10-0.20 | Include only if on-site laundry |
| Pool backwash | m³/room/day | 0.02-0.05 | Route to EQ, not to membranes directly |
| Peak hourly factor | × ADF | 2.0-2.5 | Use 2.5 for 80-150 key properties |
| EQ tank volume | % of daily flow | 20-30% | 25% minimum, with mixer + aeration |
| BOD₅ influent | mg/L | 250-400 | Design at 350 |
| COD influent | mg/L | 500-900 | Design at 700 |
| TSS influent | mg/L | 200-400 | Design at 300 |
| FOG influent | mg/L | 50-150 | Pre-treat with DAF if > 100 |
| MLSS (MBR zone) | mg/L | 8,000-12,000 | 10,000 typical |
| Design safety margin | % above ADF | — | 20% |
Flat-Sheet vs Hollow-Fiber MBR Membranes: Which Suits a Hotel?
Membrane geometry is the single most consequential equipment decision. Flat-sheet (plate) PVDF cassettes are tolerant of FOG and fibrous material from kitchens and laundries, do not suffer fiber breakage, and clean in place roughly every six months without system shutdown (per Smith & Loveless TITAN MBR QUBE spec). Hollow-fiber membranes deliver higher packing density and lower membrane area cost but are vulnerable to fouling and breakage from FOG spikes and cleaning chemicals — better suited to municipal-strength sewage with low FOG. Submerged flat-sheet systems also consume 10-20× less energy than external cross-flow designs (HydropureWater DF series spec), which makes them the lower-OPEX choice for hotel duty cycles with intermittent peak loading.
On pore size, flat-sheet DF-series modules run at 0.1 μm while hollow-fiber UF operates at ~0.01-0.04 μm — both exceed TCEQ Chapter 285 reuse limits, but the flat-sheet's higher sustainable flux on hotel wastewater reduces the membrane area required for a given flow. For hotels the default is flat-sheet PVDF unless the project is a 500+ key new-build with dedicated DAF grease removal and a buffer large enough to smooth FOG events before they reach the membranes. If you want a DF series PVDF flat-sheet membrane cassette reference, the HydropureWater DF module is the canonical flat-sheet geometry for this duty class.
| Attribute | Flat-Sheet (PVDF, submerged) | Hollow-Fiber (UF, submerged) |
|---|---|---|
| Pore size | 0.1 μm | ~0.01-0.04 μm |
| FOG tolerance | High — handles kitchen/laundry spikes | Moderate — needs DAF pre-treatment |
| Fiber breakage risk | None | Present; increases with chemical CIP |
| In-place cleaning interval | ~6 months, no shutdown | 4-8 weeks typical, more frequent on hotel duty |
| Energy use | Submerged: 0.6-1.0 kWh/m³ | Submerged: 0.8-1.2 kWh/m³ |
| Membrane area cost | Higher per m² | Lower per m² |
| Best-fit hotel profile | 80-300 keys with on-site F&B / laundry | 500+ keys, dedicated FOG pre-treatment |
| Reference install | Smith & Loveless TITAN MBR QUBE (40-ft cube) | Imemflo 250 m³/d at 200-bed hotel |
Headworks, Pretreatment, and What Goes Around the MBR
The headline MBR price excludes the auxiliaries that make the system work. Specify a 3 mm automatic fine screen as the minimum headworks protection (per Smith & Loveless packaged plant spec) to keep wipes, hair, and lint out of the membrane zone. Where on-site kitchens dominate the load, install a DAF upstream of the MBR; the ZSQ series DAF for FOG and suspended solids removal covers 4-300 m³/h and drops FOG below the 100 mg/L threshold that protects the membranes. The rotary mechanical bar screen handles larger flows at the head of the train.
The equalization tank should hold 25% of daily flow minimum, with a mechanical mixer and coarse-bubble aeration to prevent septicity between Friday banquet peaks and Monday morning lows. Downstream of the MBR, UV disinfection is the default for hotel reuse because it is chemical-free and produces no DBPs; a UV sterilizer for water treatment sized at ≥40 mJ/cm² delivers the 5-log reduction TCEQ requires for Type I reuse, with chlorine dioxide as backup for higher-log kills where the reuse target demands it. Sludge from the MBR concentrates to 1.5-2.5% DS and is best dewatered with a plate-and-frame filter press producing a 22-28% DS cake; expect 0.2-0.4 kg DS per kg BOD removed per day at design load.
Texas and San Antonio Compliance: TCEQ, Edwards Aquifer, SAWS
The TPDES discharge track under 30 TAC §305.121 sets BOD₅ at ≤30 mg/L (30-day average) and ≤65 mg/L (daily max), and TSS at ≤45 mg/L average — limits a packaged MBR typically beats by 3-5×. The reuse track under 30 TAC §285.32 (Type I Reuse) tightens the envelope to BOD₅ ≤10 mg/L, TSS ≤5 mg/L, and fecal coliform ≤20 CFU/100 mL, which is the design target to specify when the effluent feeds toilet flush, irrigation, or cooling-tower makeup. Over the Edwards Aquifer Recharge Zone, 30 TAC §213 effectively requires no discharge of pollutants, so the plant must be sized for 100% reuse or zero-discharge irrigation.
When the project connects to the municipal sewer instead, the SAWS commercial pretreatment ordinance governs: FOG ≤200 mg/L, pH 6.0-9.0, and a list of metal and chemical limits that should be re-verified at design because the SAWS ordinance updates on a different cycle than TCEQ rules. Plans submitted to TCEQ or to the city for SAWS discharge review must carry a Texas P.E. seal; the engineer of record must be licensed in Texas and have direct TCEQ OSSF or TPDES submittal experience — a point worth confirming before signing the design contract, not after.
2026 Cost Benchmarks and Supplier Selection
Turnkey CAPEX for a packaged MBR STP in the US in 2026 runs USD 250,000-450,000 for a 100 m³/day system and USD 400,000-650,000 for a 300 m³/day system, including headworks, blower room, PLC, and Texas commissioning. OPEX is dominated by power at 0.6-1.0 kWh/m³ treated; membrane replacement is a 7-10 year event at roughly USD 50-80/m² for flat-sheet PVDF cassettes, and chemical cost is minimal because the bulk of the work is biological. A baseline comparison of US hotel plant costs across regions is captured in the Arkansas municipal STP cost and compliance guide for a useful benchmark.
Score suppliers against five gates before signing: (1) factory ISO 9001 build in a documented facility, (2) NSF/ANSI 245 or 350 reference installs, (3) Texas-licensed P.E. on staff or under retainer, (4) 24-48 hour on-site service response with critical spares in a US warehouse, and (5) remote PLC monitoring included at no recurring fee (per Smith & Loveless TITAN MBR QUBE spec). Treat any bid below USD 1,500/m³/day turnkey with suspicion if it excludes headworks, equalization, disinfection, or commissioning — those are not optional. For project context outside Texas, the Copenhagen hotel MBR buyer's guide and the Dubai hotel packaged MBR guide show how the same packaged MBR envelope adapts to colder and hotter duty cycles.
| Evaluation Gate | Pass Criterion | Why It Matters |
|---|---|---|
| Factory audit | ISO 9001; documented FAT | Prevents skid-level rework on site |
| Reference installs | NSF/ANSI 245 or 350 listed | Proves reuse-grade effluent claim |
| Texas P.E. seal | Engineer licensed in TX | Required for TCEQ/SAWS submittal |
| Service response | 24-48 h on-site, US spares warehouse | Avoids 2-week membrane downtime |
| Remote monitoring | PLC telemetry, no recurring fee | Cuts operator drive-time OPEX |
| Membrane warranty | ≥5 years pro-rata | Aligns with 7-10 year replacement cycle |
| CAPEX sanity | USD 2,500-4,500 per m³/day turnkey | Below USD 1,500/m³/day = scope gap |
Frequently Asked Questions
What is the typical removal efficiency of a packaged MBR for hotel wastewater?
A submerged PVDF MBR typically removes 90-95% of harmful substances from hotel wastewater, producing effluent well below TCEQ 30 TAC §305.121 discharge limits and inside the 30 TAC §285.32 Type I Reuse envelope of BOD₅ ≤10 mg/L and TSS ≤5 mg/L (Imemflo hotel MBR reference data, 2026).
How much space does a packaged MBR plant need for a 200-key San Antonio hotel?
A single 40-ft shipping-container skid covers the 250 m³/day Imemflo benchmark at a 200-bed hotel, with the equalization tank, blowers, and PLC inside or adjacent. Compared with conventional activated sludge, the MBR envelope is roughly 60% smaller, which is the deciding factor on downtown and River Walk parcels.
Do I need TCEQ approval if my hotel discharges to the SAWS sewer?
No TCEQ discharge permit is required when the plant ties to the SAWS collection system, but the design must still meet SAWS commercial pretreatment limits (FOG ≤200 mg/L, pH 6.0-9.0) and plans must carry a Texas P.E. seal. A DAF upstream of the MBR is the standard way to hold FOG inside the SAWS envelope.
