FRP Underground Wastewater Treatment Equipment
In rural areas, residential communities, homestay scenic spots, and similar locations, surface space is precious and landscape requirements are high. Traditional above-ground equipment often occupies conspicuous space, is prone to freezing in winter, and affects environmental aesthetics. Wushi Environmental Protection introduces FRP (glass fiber reinforced plastic) underground wastewater treatment equipment, which uses corrosion-resistant, lightweight, and long-life FRP tanks to carry integrated processes such as A/O, A²/O, or MBR, fully arranged underground—the ground can be restored to greenery or parking, while underground it stably completes decarbonization, denitrification, phosphorus removal, and disinfection. It is an ideal choice for "invisible compliance" of decentralized domestic wastewater.
I. Product Positioning
FRP underground wastewater treatment equipment is an integrated device that is factory-prefabricated and fully installed underground: it uses fiberglass reinforced plastic (FRP) tanks instead of reinforced concrete or carbon steel, integrating units such as screening, equalization, biochemical treatment, sedimentation (or MBR membrane separation), and disinfection into a single underground box. FRP material resists acid and alkali corrosion, does not rust, and is lightweight. Combined with the insulation and concealment advantages brought by underground installation, it is particularly suitable for small and medium-sized decentralized point sources that are sensitive to land occupation and landscape.
II. Working Principle (Brief)
Screening / Equalization: Influent passes through screens to intercept debris, enters the equalization zone to balance water quality and quantity, and buffers hydraulic shocks.
Anaerobic / Anoxic Zone (A): Under anoxic conditions, denitrifying bacteria remove nitrate nitrogen, and phosphorus-accumulating organisms release phosphorus, laying the foundation for nitrogen and phosphorus removal.
Aerobic Zone (O): Aeration supplies oxygen; aerobic microorganisms degrade organic matter, nitrify ammonia nitrogen, and absorb phosphorus, serving as the main removal stage.
Sedimentation / Membrane Separation: Inclined tube sedimentation or MBR ultrafiltration achieves sludge-water separation, significantly reducing suspended solids and turbidity in clarified water/membrane permeate.
Disinfection and Effluent: After sodium hypochlorite or ultraviolet disinfection, it is discharged to standards or reused (for greening, toilet flushing, etc.).
Sludge Return: Part of the sludge is returned to maintain biomass; excess sludge is periodically discharged and dewatered.
Process flow: Influent → Screening/Equalization → Anaerobic/Anoxic → Aerobic → Sedimentation/MBR → Disinfection → Compliant Effluent (all completed within the FRP underground tank)
The entire process operates in a closed loop within the underground FRP tank: ground temperature is relatively stable, so nitrification is less disturbed by low temperatures in winter; the tank is enclosed and buried underground, resulting in minimal noise and odor impact on the surroundings, and the ground space is fully released.
III. Core Advantages
① FRP Material, Corrosion-Resistant and Long-LastingFRP resists acid and alkali, does not rust, and typically has a service life of over 20 years, eliminating concerns about steel corrosion.
② Fully Underground, Zero Land OccupationThe equipment is buried underground; the surface can be used for greening, parking, or landscape restoration, without occupying valuable surface space.
③ Underground Insulation, Freeze-Resistant and StableGround temperature fluctuates little, ensuring stable operation in winter and more reliable nitrification in northern regions.
④ Factory-Prefabricated, Fast InstallationThe tank is hoisted into place as a whole; only pipeline connections are needed on site, resulting in a short construction period.
⑤ Intelligent Control, Low StaffingPLC + remote monitoring enables automatic operation adjustment, reducing reliance on dedicated O&M personnel.
⑥ Modular Expansion, High FlexibilityMultiple units can be connected in parallel for capacity expansion, adapting to phased construction and flow fluctuations.
IV. Main Technical Parameters (Reference Range)
Item | Parameter Range / Description | Remarks |
|---|---|---|
Single-unit treatment capacity | Approx. 0.5 – 300 m³/d (expandable by parallel connection) | Depends on model |
Tank material | FRP (glass fiber reinforced plastic) | Corrosion-resistant, lightweight |
Optional processes | A/O, A²/O, MBR, etc. | Selected per standards |
Effluent standard | Grade B / Grade A / quasi-Class IV / reuse | Per project requirements |
COD removal rate | Approx. 80% – 90%+ | Depends on water quality |
Ammonia nitrogen (NH₃-N) removal rate | Approx. 80% – 95% | Aerobic nitrification |
Total phosphorus (TP) removal rate | Approx. 70% – 90% | Biological + chemical phosphorus removal |
Design service life | ≥ 20 years | FRP material |
Power consumption per ton of water | Approx. 0.3 – 1.0 kWh/m³ | Varies with process and scale |
Layout | Fully underground | Surface can be greened |
* The above are typical reference ranges. Actual removal performance is affected by raw water quality, process selection, water temperature, and operation management. Specific values shall be determined by design calculations and on-site commissioning.
V. Typical Application Scenarios
Scenario | Adaptation Description |
|---|---|
Rural / township wastewater | Decentralized households and market towns; surface needs to be restored to farmland/greenery |
Residential communities / villa clusters | Domestic wastewater in residential areas; sensitive to landscape and noise |
Homestays / farmhouses / scenic areas | Tourist areas requiring concealment and low impact |
Military camps / border outposts | Low staffing; remote management and control required |
School / hospital domestic wastewater | Small to medium domestic wastewater to standards or reuse |
Temporary construction sites / camps | Can be relocated and reused as a whole; short construction period |
VI. Applicable Boundaries and Selection Recommendations
FRP underground equipment is suitable for decentralized, small to medium-volume domestic wastewater and organic wastewater with similar water quality; industrial wastewater requires prior assessment of biodegradability and inhibitors. Before underground installation, groundwater level and soil conditions should be surveyed, anti-floating design and proper backfilling should be carried out, and inspection openings and hoisting space should be reserved at the site. In low-temperature areas, MBR or enhanced insulation is recommended; although the equipment is automated, it is still advisable to establish regular inspection and chemical (phosphorus removal, disinfection) replenishment mechanisms to ensure long-term stable compliance.
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FAQ
How much does this equipment cost?
The price varies by treatment capacity, water quality, materials and configuration, so a custom quote is provided based on your actual conditions. We offer free water testing and solution design, with a detailed quote within 1 working day after requirements are confirmed.
What treatment capacity is available? Can it be customized?
Capacity is fully customizable, ranging from tens to thousands of tons per day (e.g. 0.5–30 m³/h), with non-standard design support matched precisely to your inlet/outlet requirements.
How long does delivery take?
Standard equipment typically takes about 2–4 weeks to produce; custom projects depend on scale and process. The delivery date is confirmed at contract signing, with design, manufacturing and shipping progressing on schedule.
Is installation and commissioning included?
Yes. We provide installation, system commissioning, operator training and environmental acceptance assistance, as well as long-term managed operation services on request.
What about after-sales and warranty?
We provide a warranty period and a 24/7 technical hotline, with free repair for non-human faults during the warranty period, plus spare parts supply and regular inspection services.
Return the ground to greenery, purify wastewater underground
We can provide geotechnical survey adaptation, process selection, tank layout, and remote monitoring solutions. Welcome to call or leave a message to obtain configuration recommendations for your site scale and discharge standards.
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