WSZ series underground integrated sewage treatment plant combines anoxic/aerobic (A/O) biological contact oxidation with sedimentation and disinfection in a single buried package unit. Fully automated with no operator required, it handles 1–80 m³/h for residential communities, hotels, hospitals, factories, and rural areas. Can be installed below grade with landscaping above, or mounted on a trailer for mobile deployment.
The WSZ series underground package sewage treatment plant is an advanced, fully integrated wastewater treatment system designed for decentralized applications. Installed below ground level, the unit allows the surface above to be used for landscaping, parking, or other purposes — eliminating the need for dedicated treatment buildings, heating, or insulation. The system operates on a fully automatic control platform requiring no on-site operator, no sludge recirculation, and minimal maintenance.
Engineered for municipal and light industrial organic wastewater, the WSZ series delivers treated effluent that meets or exceeds EU Urban Waste Water Treatment Directive (91/271/EEC) secondary treatment standards and US EPA NPDES discharge requirements for BOD, TSS, and pathogen reduction.
The WSZ system employs a proven A/O (Anoxic/Aerobic) biological contact oxidation process, integrating seven treatment stages in a single package unit:
Process Flow: Raw Sewage → Bar Screen → Equalization Tank → Pump → Primary Settler → A-Stage (Anoxic) → O-Stage (Aerobic) → Secondary Clarifier → Disinfection → Treated Effluent Discharge
| Parameter | Standard Model | Enhanced Model |
|---|---|---|
| Treatment Capacity | 1.0 – 80.0 m³/h (24 – 1,920 m³/day) | Custom design for >80 m³/h |
| Influent COD | ≤ 250 mg/L | ≤ 400 mg/L |
| Influent COD (Custom) | Custom engineering available for COD > 400 mg/L | |
| Biological Process | A/O Contact Oxidation | |
| Construction Materials | SS304/316, Carbon Steel (Q235), Steel+FRP Composite, Full FRP, Reinforced Concrete | |
| Installation | Below grade (buried) or above grade; trailer-mounted option available | |
| Effluent Standard | Meets EU Directive 91/271/EEC & US EPA secondary treatment standards | |
| Automation Level | Fully automatic PLC control, no dedicated operator required | |
The WSZ underground package plant delivers a proven, low-maintenance solution for decentralized wastewater treatment. With its buried installation eliminating visual and noise impact, fully automatic operation requiring zero dedicated staff, and flexible material options to match any site condition or budget, the WSZ series is the go-to choice for municipalities, developers, and industrial operators who need reliable treatment without the complexity of a conventional plant. Whether installed permanently below a landscaped area or mounted on a trailer for rapid deployment, the WSZ system provides consistent, regulation-compliant effluent quality with the lowest total cost of ownership in its class.
The WSZ series covers 1–80 m³/h (24–1,920 m³/day). Custom designs are available for higher flow requirements.
Yes, the WSZ system is available as buried, above-grade, or trailer-mounted configurations for emergency deployment scenarios.
SS304/316 stainless steel, carbon steel Q235, carbon steel + FRP composite, full FRP cylindrical, and reinforced concrete options are available.
No, the WSZ system features fully automatic PLC control and requires only periodic inspection.
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