Packaged MBR STP for Hotels in Thiès: 2026 Buyer's Guide

What a packaged MBR STP actually delivers for a hotel in Thiès

A packaged MBR sewage treatment plant for a hotel in Thiès is a pre-engineered membrane bioreactor mounted inside a standard 20 ft or 40 ft high-cube (HC) shipping container. The fixed process train runs: influent → 1.5 mm drum screen → anoxic/aerobic biological stage → submerged PVDF ultrafiltration membrane tank (0.04–0.1 µm pore) → disinfection, all governed by a PLC panel (per HydropureWater S1; Senegal MBR engineering guide S5). Stock effluent already sits inside ONAS's discharge envelope: BOD <5 mg/L, TSS <1 mg/L, and 99% pathogen removal at the membrane step (per S1, S5).

Hotels in Thiès prefer the containerized format over built-in concrete because the unit arrives on a flatbed, drops on a 150 mm RC concrete pad, and needs only power and piped influent. No reinforced basins, no long civil schedule, and if a project is phased or relocates within 2–5 years, the container can be lifted and redeployed (per S1). Ambient Thiès temperature sits inside the 20–30°C operating band, so no HVAC is required (per S1 design envelope). Real-world scale reference: a 200-bed 5-star hotel installation handling 250 m³/day with submerged MBR membranes has been in continuous service since startup, meeting the wastewater reuse standard (per S4). For a hotel, the integrated containerized MBR system is therefore the most defensible default — it removes 90–95% of harmful substances in a single skid (per S4).

Sizing the hotel: beds, F&B covers, staff, laundry, and pool

Hotel sizing fails when engineers copy a camp or residential per-capita number onto transient guests, F&B covers, and laundry. A defensible Thiès hotel sizing is built from five separate load lines, not one.

1. Design occupancy. Room count × target occupancy % — Thiès dry-season tourism can push 80–90%, off-season 40–50% — plus +5–10% walk-in visitors that are routinely under-counted (per S1).
2. Per-capita flow factors. Transient guests >250 L/c/d, staff quarters 200–250 L/c/d, attached long-stay residences 130–180 L/c/d (per S1).
3. Non-room loads. Restaurant covers at 30–50 L/cover, laundry at 30–60 L/kg of linen, pool backwash at 5–10% of pool volume per week.
4. Peak factor. Use 1.8–2.2 for hotels (above steady residential 1.5–1.8, below camp 2.0–2.5 because guest flows are spread over 14–18 hours) (per S1).
5. Spare capacity. Add 20–30% above Qpeak for tourism spikes and reuse upgrades (per S1).

Worked example — 120-room Thiès hotel: 120 rooms × 70% occupancy × 2 guests/room = 168 guests × 260 L = 43.7 m³/day. Add 30 staff × 220 L = 6.6 m³/day. Add 200 F&B covers × 40 L = 8.0 m³/day. Add 150 kg laundry/day × 45 L = 6.75 m³/day. Add pool backwash and gardens ≈ 3 m³/day. Qavg ≈ 68 m³/day. Qpeak = 68 × 2.0 / 24 ≈ 5.7 m³/h. Adding 25% spare drives the spec to ~85 m³/day design flow, which lands squarely in the 40 ft HC envelope (per S1 container envelope). The same logic is detailed in the containerized MBR sizing guide for Thiès camps and residential for non-hotel occupancies.

Container selection: 20 ft HC vs 40 ft HC, single vs parallel

Translate Qavg into a container line item before the RFQ goes out. The standard envelope: a single 20 ft HC unit handles up to ~50 m³/day, and a single 40 ft HC unit covers 50–200 m³/day (per S1; Pure Aqua / WaterAcademia S5). For a 60–110 m³/day Thiès hotel — which captures most 100–150-room properties — the default is a single 40 ft HC unit. Above ~150 m³/day, parallel two 40 ft units with one held as standby (per S1 paralleling note). On phased projects, pre-plumb the second pad from day one so the second container drops in without re-plumbing (per S1).

The pad spec is the same for both: a flat 150 mm RC concrete slab, with standard flatbed truck access. The 40 ft unit needs a longer clear approach radius — verify turning circle before civil works. For boutique riads and small lodges under 25 m³/day where an above-grade container is visually unacceptable, the WSZ underground package STP is a quieter alternative. The submerged cassette inside either container format is typically built on DF series PVDF flat sheet membrane modules, which can be swapped or expanded without replacing the container.

Thiès-specific checks: voltage, climate, grid outages, and pre-treatment

Four site questions make or break a Senegal hotel install, and none of them appear on a stock MBR datasheet.

Power. Senegal's grid is 220–240V / 50Hz, but most containerized MBR stock is built for 460V / 3Ph / 60Hz (per S1, S5). Specify a 220–240V / 50Hz build or price a step-up transformer into the RFQ at quotation — retrofitting later is expensive and delays commissioning.

Grid outages. A typical Thiès site sees 4–8 hours/week of grid interruption (per S1). A membrane plant without backup will trip on the first sustained outage and dump untreated flow. Size a genset or solar-hybrid buffer so the aeration blowers and permeate pumps ride through outages. The DF series flat sheet cassette is preferred here because it tolerates manual cleaning during power interruptions (per S5).

Climate. Thiès ambient 25–32°C sits inside the 20–30°C operating band, so no HVAC is needed (per S1). On sites with high groundwater, the container's sealed floor and zero-leakage wall design matter for flood resilience (per Pure Aqua envelope).

Hotel-specific pre-treatment. Generic residential pre-treatment is not enough.

• Kitchen grease. A grease trap upstream of the drum screen is non-negotiable for hotels — FOG smears PVDF membranes and shortens cleaning intervals from months to weeks.
• Laundry lint. A lint trap on laundry discharge is mandatory; hotel laundry lint is a primary membrane-fouling cause in hospitality MBRs.
• Pool backwash. Route pool backwash through a sand trap before the MBR; chlorine residual in backwash kills biomass if it enters the bioreactor unbuffered.
• Screening. Keep the standard 1.5 mm drum screen, but add grit removal ahead of it for hotels with sandy parking or pool-deck wash-down (per S1 grit warning). A GX series rotary bar screen handles the higher rag and lint load typical of hotel greywater.

ONAS discharge vs reuse: which path does the hotel actually need?

Decide on the effluent endpoint before specifying polishing, because reuse changes the disinfection stage and the CAPEX line. ONAS enforces two distinct standards. The general discharge standard for environmental release: BOD <30 mg/L, COD <125 mg/L, TSS <35 mg/L, fecal coliform <1,000 CFU/100mL (per S5, aligned with EU Urban Waste Water Directive 91/271/EEC). The reuse standard for irrigation or toilet flushing: fecal coliform <10 CFU/100mL, which requires UV or chlorination downstream of the MBR tank (per S5).

Confirm the receiving environment first — ground irrigation, surface watercourse, or municipal sewer — because each implies a different polishing train (per S1). For hotel gardens, golf-green irrigation, or toilet-flushing reuse, add a UV sterilizer after the MBR; a chlorine dioxide generator is a stronger alternative for sites with intermittent flow where UV dosing is harder to validate. For systems >500 m³/day, an Environmental and Social Impact Assessment (ESIA) is usually required by ONAS, plus site inspection to confirm blower redundancy and emergency power (per S5). The full compliance checklist is laid out in the Senegal MBR engineering guide with ONAS limits and 2026 cost benchmarks.

2026 cost benchmarks and ROI for a Thiès hotel MBR

Senegal MBR CAPEX sits at $2,400–$4,000 per m³/day including civil works and membrane install (per S5, 2026 Dakar benchmark). For a 100 m³/day Thiès hotel, that translates to a turnkey budget of $240K–$400K before the voltage transformer, genset, and pre-treatment civil works. OPEX is $0.20–$0.40/m³, dominated by energy at $0.15–$0.22/kWh for industrial users in Dakar; membrane replacement every 5–8 years adds $0.05–$0.10/m³ amortized (per S5).

ROI is driven by three Senegal-specific line items: avoided ONAS fines of $50–$200/m³, municipal water offset of $0.80–$1.50/m³ for reuse, and the high value of urban land. Typical payback is 3.5–5 years (per S5). For a hotel specifically, the water-reuse line item — landscape irrigation, toilet flushing, and laundry makeup — usually justifies 30–50% of the CAPEX before fines are even counted. A real-world 250 m³/day hotel installation has been meeting the wastewater reuse standard continuously since startup, with treated water recycled back to multiple non-potable uses (per S4). The economics are similar in structure to the hotel and resort MBR selection guide for comparable European hotel contexts.

Frequently asked questions

What per-bed flow should I use to size a hotel MBR in Thiès?

For transient guests in a Thiès hotel, use >250 L per guest-occupant-day as the baseline, plus 200–250 L/c/d for staff, 30–50 L per F&B cover, and 30–60 L per kg of laundry. For a 120-room hotel at 70% occupancy with 2 guests/room (168 guests), 30 staff, 200 F&B covers/day, and 150 kg laundry/day, Qavg works out to roughly 68 m³/day. After a peak factor of 2.0 and 25% spare, the design flow is about 85 m³/day — a single 40 ft HC unit (per S1 sizing logic).

Does my hotel need ONAS discharge standard or ONAS reuse standard?

It depends on where the effluent goes. ONAS general discharge allows fecal coliform <1,000 CFU/100mL, BOD <30 mg/L, COD <125 mg/L, TSS <35 mg/L (per S5). ONAS reuse for irrigation or toilet flushing requires fecal coliform <10 CFU/100mL, which means adding UV or chlorine dioxide downstream of the MBR. If the hotel is reusing for gardens, greens, or toilet flushing, the reuse standard applies and the disinfection stage is not optional.

Do I need a transformer for a 220–240V / 50Hz Senegal grid?

Most containerized MBR stock is built for 460V / 3Ph / 60Hz (per S1, S5). For Senegal's 220–240V / 50Hz grid, either order a voltage-matched build or price a step-up transformer into the RFQ. Also size a genset or solar-hybrid buffer for 4–8 hours/week of typical Thiès grid interruption, so the membrane plant does not trip and dump on the first sustained outage (per S1 outage rule of thumb).

What is the alternative to a containerized MBR for a small hotel or riad under 25 m³/day?

For boutique lodges and small riads where an above-grade container is visually unacceptable, the WSZ underground package STP is the standard alternative. It uses the same biological + membrane process train but is buried below grade, leaving the surface free for landscaping or parking. It handles flows up to roughly 25 m³/day in a single buried unit (per S1 product envelope).

Which disinfection stage closes the gap to ONAS reuse targets?

The MBR alone meets general discharge but not the reuse fecal coliform limit of <10 CFU/100mL. A UV sterilizer downstream of the membrane tank is the most common polishing step for continuous-flow hotel reuse. A chlorine dioxide generator is the stronger choice where flow is intermittent, because ClO₂ holds a residual in the reuse distribution loop and tolerates flow variations better than UV (per S5 reuse standard).