Engineered directly in our 12,000 m² state-of-the-art facility in Dezhou, Shandong. Full OEM/ODM custom manufacturing backed by rigorous pneumatic and hydrostatic testing.
Addressing modern water scarcity through decentralized sub-grade containment, closed-loop treatment loops, and advanced geotechnical load calculations.
Rapid urban densification has made above-ground real estate for non-potable grey water treatment financially unviable. Buried modular reservoirs recover subsurface land for vehicular parking, green corridors, or structural foundations without compromising multi-hundred-ton water retention capabilities.
Global regulatory bodies (including US EPA Clean Water Act frameworks, EU Directive 2020/2184, and GCC water conservation mandates) impose severe tariffs on high freshwater consumption. Buried grey water networks recycle cooling tower blowdown, HVAC condensate, and domestic wastewater for tertiary reuse.
Grey water contains surfactant residues, dissolved organic carbon, and volatile compounds prone to anaerobic fermentation. Advanced ODM underground tanks integrate baffle aerators, automated sludge collection sumps, and gastight vent connections rated to withstand high static negative pressures.
Evaluating durability against acidic wastewater, high soil salinity, high groundwater buoyancy, and heavy dynamic surface loads.
| Tank Structural System | Material Metallurgy & Coating | Tensile / Compressive Yield | Corrosion & Surfactant Rating | Optimized Installation Use Case |
|---|---|---|---|---|
| Enamel Steel Modular System | Titanium-alloy baseplate coated with double-sided sintered porcelain enamel (850°C-900°C) | High compressive strength, rigid bolt-assembled joints with self-locking seals | pH 2 to pH 12 resistant, zero bacterial biofilm adhesion, chemical abrasion resistant | Industrial grey water containment, laundry wastewater recovery, large municipal systems |
| Buried SUS304 Welded System | Austenitic Chromium-Nickel Stainless Steel (18/8) with continuous TIG/plasma seam weld | Tensile yield ≥ 205 MPa; high ductility with external steel internal tie-rod arrays | Excellent potable water barrier, resistant to moderate organic surfactants & detergents | Commercial office towers, hospitals, urban mixed-use developments, grey water HVAC feed |
| Buried SUS316 Marine System | Austenitic Chromium-Nickel with 2.0-3.0% Molybdenum additions | Tensile yield ≥ 220 MPa; elevated resistance against chloride pitting & stress cracking | Maximum resistance to industrial wash solvents, saline coastal soils, chlorite solutions | Coastal infrastructure, chemical processing plants, marine port facilities, hypersaline groundwater |
| Composite Buried Anti-Buoyancy | Hot-dip galvanized structural rib cage with internally lined SUS304 or food-grade enamel | Engineered to counter active groundwater buoyant uplift up to 1.8x hydrostatic displacement | External bitumen/epoxy dielectric barrier with sacrificial zinc/magnesium anodes | High water table installations, deep basement slabs, vehicle transit corridors |
Custom engineered geometries matching tight subterranean envelopes, complex plant rooms, and variable soil profiles across multiple international sectors.
Modern computing facilities generate massive volumes of high-quality condensate from CRAC/CRAH systems. Our subterranean tanks capture this non-potable volume directly beneath electrical substations or parking aprons, feeding our closed and counterflow cooling towers without consuming municipal mains water.
Large transportation terminals generate fluctuating surge loads of washroom and aircraft cleaning runoff. Fengdun’s high-capacity enamel and welded stainless tanks handle sudden volumetric surges, utilizing interior automated baffle stages to separate light sediments before biological purification.
Industrial processing requires non-potable rinsing loops, equipment cooldown, and facility floor washdowns. Our buried grey water tanks integrate with fire protection reservoirs, isolating non-potable process loops while meeting NFPA 22 separation distances and local civil safety boundaries.
From geotechnical soil-pressure modeling to factory witness testing, we eliminate procurement risk for international EPC contractors.
Every modular containment segment undergoes 100% full-capacity pressure and hydraulic holding checks for a mandatory 24-48 hour cycle to certify zero seam micro-leakage before dispatch.
Full support for independent site and factory verification by SGS, Bureau Veritas (BV), and TÜV. Complete mill test certificates (MTC) supplied with full heat-number traceability.
Simulated finite element stress modeling calculates active soil thrust, heavy live traffic loads (AASHTO HS-20 ratings), and local seismic acceleration coefficients (PGA 0.4g+).
Underground tanks are coated with multi-layer high-build polyurethane or coal tar epoxy, complemented by sacrificial magnesium anodes to neutralize subterranean electrolytic action.
Bridging heavy mechanical engineering with next-generation sensor automation for closed-loop, low-maintenance subterranean fluid reservoirs.
Continuous acoustic sensing mounted internally maps sedimentation thickness along the tank floor, sending automated purging alerts to prevent pump impellers from drawing accumulated solids into downstream cooling loops.
To eliminate anaerobic septicity and odor complaints in nearby surface areas, self-aspirating low-noise venturi jets maintain positive dissolved oxygen levels without requiring noisy above-ground air compressors.
Integrated telemetry interfaces transmit real-time water quality indices (TDS, pH, turbidity, fluid temperature) directly to building management systems, automatically directing effluent to appropriate secondary treatment stages.
Addressing key geotechnical, metallurgical, and lifecycle concerns encountered by EPC contractors and lead building consultants.
Groundwater uplift is countered through precision anti-buoyancy engineering. We provide extended bottom flanges that bolt directly into reinforced concrete ballast slabs. In ultra-high water table zones, our structural engineers calculate required slab ballast weights and configure integrated ground-anchor points, ensuring safety factors > 1.5 against maximum high-water mark uplift.
When specified with adequate external dielectric coating and sacrificial anodes, our sintered enamel steel subterranean tanks achieve service lifespans exceeding 30-35 years due to the inert nature of the fused porcelain layer. Welded SUS316 installations exhibit comparable or greater lifespans even in high-chloride or marine soils. SUS304 delivers a reliable 25+ year lifespan in non-saline ground conditions.
Yes. For vehicle loading conditions, our tanks are manufactured with reinforced internal vertical columns and heavy-duty structural roof ribs. In conjunction with a top-relieving concrete distribution slab, the structure easily supports AASHTO HS-20 or European standard 60-ton live vehicle wheel loadings without transferring deflection stresses to internal water containment plates.
We supply comprehensive technical packages including certified structural engineering calculations, 3D BIM/Revit models, Finite Element Analysis (FEA) reports, coating adhesion tests, factory hydrostatic holding records, and full welding inspection documentation (NDT reports) satisfying municipal and national environmental standards worldwide.
Integrate your subterranean grey water reservoirs with high-efficiency cooling towers, fire smoke exhaust dampers, and precision air flow equipment directly from Shandong Fengdun.
