Start With the Four Sizing Inputs That Drive Everything Else
Locking down four numbers before any equipment selection prevents most of the rework on Algiers residential and camp projects. The first is served population — use permanent residents for a housing compound, peak occupancy for a worker camp, and add a 10–15% headroom margin for the expanding Algiers suburbs where compounds often phase in additional blocks. The second is per-capita domestic flow: North African/Maghreb residential design values typically fall in the 150–200 L/c/d band, and the MBR supplier's reference basis of 50 gallons per capita per day, roughly 190 L/c/d, sits inside that range (S5). Always reconcile this against the project specification or local Direction de l'Environnement guidance before issuing the enquiry.
The third input is the peak hour factor. Algerian practice uses approximately 2.0–2.5 for small camps under 200 people, where morning and evening demand spikes dominate, and 1.5–1.8 for larger communities where the diurnal curve flattens. This ratio sizes the equalization tank and the permeate pump duty, not the average daily flow. The fourth input is the influent load: assume roughly 40 g BOD/c/d, 80 g COD/c/d, 8–10 g TKN/c/d, and 6–8 g total phosphorus/c/d unless site-specific sampling is available. These defaults drive the aeration tank volume, the food-to-microorganism ratio, and whether an anoxic zone for denitrification needs to be added.
Calculate Daily Flow, Peak Flow and Organic Load
With the four inputs fixed, the next step is to convert them into the engineering numbers that the supplier's selection form will ask for. Average daily flow is Qd = population × per-capita flow. For a 200-person camp at 180 L/c/d, Qd = 36 m³/d. For a 1,000-resident compound at 200 L/c/d, Qd = 200 m³/d. These two flows bracket the typical envelope of Algiers residential and camp projects in 2026.
Peak flow is Qp = Qd × peak factor. For the 200-person camp at a peak factor of 2.2, Qp reaches roughly 79 m³/d, equivalent to about 7–8 m³/h instantaneous. For the 1,000-person compound at a peak factor of 1.7, Qp is about 340 m³/d, or 14 m³/h instantaneous. The peak figure sets the feed pump rating, the equalization tank volume (commonly one peak cycle), and the membrane flux rating. Document peak and average separately: oversizing the membrane train for peak duty wastes capital, while undersizing it for peak pushes the flux above the sustainable limit and accelerates fouling — a recurring failure mode in Mediterranean-climate camps with concentrated morning and evening demand.
Organic load is BOD load (kg/d) = population × 40 g/c/d ÷ 1,000. The 200-person camp produces 8 kg BOD/d; the 1,000-person compound produces 40 kg BOD/d. MBR systems sustain biomass concentrations of 6,000–12,000 mg/L, far above conventional activated sludge (S1), which is what allows the same biological load to be treated in a tank roughly half the volume of a conventional plant. When matching a containerized MBR system to a hydraulic load, request the manufacturer's design flux in L/m²·h at the design temperature and convert it to required membrane area: required area (m²) = peak permeate flow (L/h) ÷ design flux (L/m²·h).
Match Population and Flow to a 20' or 40' HC Container
Standard ISO footprints simplify the container-count decision. Pure Aqua supplies both 20' and 40' high-cube containerized MBRs, each pre-assembled with a 1.5 mm drum screen, fine-bubble diffusers in the aeration tank, and a built-in membrane air-scour system (S5). MENA-Water states that more than 1,200 m³/day can be filtered in a single 40' ISO container with stainless internal tanks and plug-and-play delivery (S2), which sets the practical upper bound for a single-train design. Containerized MBR product lines typically span 10–2,000 m³/day with sub-micron effluent (S3 supports this pore-class range), so the residential-camp envelope rarely needs custom engineering in Algiers.
Use the table below to map population and average daily flow to a starting container configuration. Refine against the supplier's specific flux rating and any site footprint constraints.
| Served population | Per-capita flow | Qd (m³/d) | Starting configuration | Notes |
|---|---|---|---|---|
| 50–100 | 180 L/c/d | 9–18 | Single 20' HC | Worker camp, single shift; 1.5 mm drum screen only |
| 100–250 | 180 L/c/d | 18–45 | Single 20' HC, optional anoxic zone | Add equalization for peak factor 2.0–2.5 |
| 250–500 | 190 L/c/d | 48–95 | Single 40' HC | Residential compound or large camp |
| 500–1,000 | 200 L/c/d | 100–200 | Single 40' HC or parallel 20' HC pair | Pair gives redundancy and phased capacity addition |
| 1,000–2,000+ | 200 L/c/d | 200–400 | Multi-container train or single 40' HC at high flux | Validate against single-unit 1,200 m³/d ceiling (S2) |
Small camps under roughly 250 people generally fit a single 20' HC unit with an optional anoxic zone if denitrification is required. Communities above 500 people typically warrant a 40' HC or a parallel train of 20' units, which provides both redundancy and the option to add capacity in phases as the compound expands. For Algiers projects over 1,200 m³/d, plan a multi-container train from the outset rather than pushing a single 40' HC beyond its design envelope.
Pretreatment, Aeration and Membrane Flux Choices
Pretreatment is what protects the membrane and determines cleaning frequency. A 1.5 mm drum screen is the standard front-end for containerized MBRs (S5) and is sufficient for residential sewage with normal solids loading. For camps with hair, lint, and food-oil loads — common in labour camps with shared kitchens — step up to a finer rotary bar screen, since the membrane supplier explicitly warns against fats, oils, and hair entering the reactor (S1). A rotary bar screen with 2–3 mm aperture typically catches fibrous debris before it reaches the drum screen and reduces biofouling risk on the membrane cassettes downstream.
Aeration sizing must satisfy two separate duties: oxygen transfer for BOD oxidation in the aeration tank, and membrane scouring beneath the submerged cassettes. Fine-bubble diffusers handle oxygen transfer efficiently, while coarse-bubble diffusers under the membrane modules provide the cross-flow that keeps the membrane surface clear (S5). On the membrane side, the two main options for Algiers municipal sewage are flat-sheet CPVC at 0.4 μm nominal / 0.2 μm average (S1) and hollow-fibre PVDF at 0.02–0.04 μm (S3/S5). Flat sheet is more tolerant of fibrous debris and easier to clean in place; hollow fibre packs more area per cubic metre but is more sensitive to fouling and requires stricter pretreatment. For Mediterranean residential and camp sewage with the pretreatment chain described above, either geometry works; the decision is usually driven by supplier preference and cassette availability.
HydropureWater's DF series flat-sheet module is rated at 0.1 μm with an integrated aeration box, with cassettes delivering 80–225 m² of membrane area and producing 32–135 m³/day per unit, which keeps the energy footprint low compared to external cross-flow designs. Reference principles for avoiding the common fouling modes are covered separately in our guide to preventing MBR membrane fouling.
Adjust the Design for Algiers-Specific Conditions
Generic MBR designs assume temperate operating conditions. Algiers requires three local adjustments. First, temperature: summer mixed-liquor temperatures reach 20–30 °C, which matches the operating window the manufacturer designs for (S5). Cold snaps in the Atlas foothills are not a concern, but the design should check oxygen transfer efficiency and mixed-liquor viscosity at the upper end of the band, since oxygen transfer drops as temperature rises.
Second, power stability. Remote camps and compounds under construction are often genset-backed or supplied from an unstable grid. Size the equalization tank to at least one full peak cycle so the plant can ride out a power event, and specify VFD-driven blowers to match diurnal flow rather than running at a fixed output. The VFD also protects the membrane from hydraulic shock when pumps restart after an outage. Third, reuse. Algiers is a water-scarce Mediterranean city, and the MBR UF permeate is well suited to landscape irrigation, toilet flushing, and RO feed (S3). Confirm the exact reuse envelope with the Direction de l'Environnement and any ONEDD guidelines that apply to the project's wilaya, and add a polishing step such as UV disinfection if the reuse application involves human contact. Phosphorus removal is usually not required for irrigation reuse; it becomes mandatory when the receiving waterbody classification demands it, in which case chemical dosing for P precipitation is added downstream of the biological stage. A comparative reference for a similar hospitality project is our guide to a packaged MBR STP for hospitality, and a parallel regional reference for camp STP design is our guide to Sewage treatment equipment suppliers in Agadir.
Frequently Asked Questions
What CAPEX band and lead time should I expect for a containerized MBR STP shipped from China to Algiers port?
Quoted CAPEX and lead times vary with capacity, container count, and scope of pretreatment, so request a line-itemized proposal that breaks the price into the containerized MBR train, the rotary bar screen or drum screen, the blowers and control panel, and any anoxic zone or UV polishing skid. Lead time from order to factory acceptance test is typically 6–10 weeks for standard configurations, plus 3–5 weeks for sea freight to Algiers, plus 1–2 weeks for site installation and commissioning. Ask the supplier for an FOB and a CIF Algiers quote side by side so the freight and customs handling are visible.
Should I size for the full 2026 population or plan a modular train that grows?
For Algiers residential compounds and remote camps, a modular train of parallel 20' or 40' HC units is almost always preferable to a single oversized unit, because the modular configuration lets you add capacity in 100–200 m³/d increments as occupancy grows, and a parallel unit gives you redundancy during membrane maintenance. Size the civil works — equalization tank, interconnecting pipework, and the electrical bus — for the ultimate population, but order the membrane containers only for the first phase. Confirm that the supplier's control panel can manage multi-unit operation from a single HMI before locking in the train architecture.
Which Algerian authority approves the discharge, and what are the typical reuse limits?
Discharge to a watercourse or to irrigation is approved by the Direction de l'Environnement of the wilaya, with technical reference to the Ministry of Environment norms and any ONEDD reuse guidelines that apply to the receiving use. MBR permeate with sub-micron suspended solids and very low BOD/COD typically meets irrigation reuse limits, but a polishing step such as UV disinfection is usually required for landscape or toilet-flushing reuse, and confirm the exact limits in writing before commissioning. Keep the discharge consent and any reuse authorization on file as part of the project handover documentation.
How often do the membranes need chemical cleaning, and what operator skill is required?
With a properly sized 1.5 mm drum screen and standard residential loading, a containerized MBR typically needs an in-situ chemical wash every 1–3 months, with a more intensive recovery clean once or twice per year, and the membrane supplier programs the wash cycles automatically. Operator skill is moderate: daily checks on MLSS, dissolved oxygen, and permeate turbidity, plus monthly inspection of diffusers and pumps. For remote camps, train two operators and ensure remote monitoring is enabled so the supplier can review trends and flag fouling before it forces an unscheduled shutdown.
Related Equipment
- flat-sheet MBR membrane module — specifications, capacity range, and technical data
