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T: +86-17717097520
E: sales1@melko2015.com
E: sales1@melko2015.com
No.222 Xiangche Rd. Chedun Town Songjiang Dist. Shanghai China 201611
Water purification systems transform contaminated water into quality-controlled output through multi-stage treatment processes combining filtration, membrane separation, and ion exchange technologies. Unlike standalone filters that address single contaminants, integrated purification plants solve comprehensive water quality challenges—from 50,000 ppm seawater desalination to 18.2 MΩ·cm semiconductor ultrapure water production. Shanghai Melko designs turnkey systems scaled from 500 gallons per day (GPD) residential units to 5 million GPD municipal facilities, delivering measurable cost reductions versus bottled water procurement or water hauling operations.
| Water Source Challenge | Without Purification System | With Melko System | Annual Savings |
|---|---|---|---|
| Bottled Water (1000 employees) | $180,000/year $0.50 per gallon × 1000 gal/day | $22,000/year Operating cost of 10 TPH RO system | $158,000 Payback: 8 months |
| Water Hauling (Remote Site) | $95,000/year $2.60 per gallon transport cost | $18,500/year Brackish water RO + energy | $76,500 Payback: 14 months |
| Boiler Scale Damage | $120,000/year Equipment replacement + downtime | $28,000/year Softening + RO system operation | $92,000 Payback: 11 months |
| Pharmaceutical Water Compliance | $340,000/year Outsourced USP water + testing | $85,000/year RO+EDI in-house system | $255,000 Payback: 6 months |
RO membranes remove 95-99.5% of total dissolved solids (TDS) by applying pressure (150-1200 PSI) to force water through semi-permeable membranes with 0.0001-micron pore size. This pressure-driven process eliminates sodium, calcium, chloride, nitrate, and heavy metals while rejecting bacteria, viruses, and pyrogens. Our seawater desalination RO systems convert 35,000-45,000 ppm ocean water to<500 ppm potable water at recovery rates of 30-50%, critical for coastal industries, island resorts, and offshore platforms. Brackish water RO plants treat 2,000-10,000 ppm groundwater at 75-85% recovery, serving agriculture irrigation, beverage production, and boiler feedwater preparation. Key advantage: Energy consumption of 3-6 kWh per cubic meter—80% lower than thermal distillation methods.
UF hollow fiber membranes with 0.01-0.1 micron pore size provide absolute barrier against bacteria, protozoa, and suspended solids without chemical addition. Operating at low pressures (10-30 PSI), UF systems achieve 99.99% pathogen removal validated by EPA and WHO standards, making them ideal for municipal drinking water plants treating surface water sources. Unlike RO, UF retains beneficial minerals (calcium, magnesium) while removing turbidity to<0.1 NTU. Our submerged UF membrane modules integrate directly into water treatment tanks, reducing footprint by 60% versus conventional clarifiers. Backwash automation extends membrane life beyond 7 years. Applications include: river water pre-treatment before RO, wastewater tertiary treatment for reuse, and food & beverage process water clarification.
EDI modules combine ion exchange resins with electric current to produce 15-18.2 MΩ·cm resistivity water continuously without chemical regeneration. Positioned after RO systems, EDI polishing removes residual ions to parts-per-billion levels required by semiconductor fabrication (SEMI standards), pharmaceutical injection water
| Feed Water Quality | Recommended System | Expected Output Quality | Typical Applications |
|---|---|---|---|
| TDS 500-5,000 ppm Turbidity<5 NTU | Single-Stage RO | TDS<50 ppm Recovery 75-80% | Drinking water, ice making, car wash recycling |
| TDS 5,000-15,000 ppm High hardness | Softener + RO | TDS<100 ppm Recovery 65-75% | Boiler feedwater, cooling towers, irrigation |
| Seawater 35,000+ ppm Coastal/offshore | SWRO with Energy Recovery | TDS<300 ppm Recovery 35-45% | Hotels, ships, island communities, aquaculture |
| Surface water Bacteria >1000 CFU/ml | UF Pre-treatment + RO | Bacteria<1 CFU/100ml TDS<50 ppm | Municipal plants, bottled water, swimming pools |
| RO permeate TDS<20 ppm | RO + EDI Polishing | Resistivity >15 MΩ·cm TOC<10 ppb | Pharmaceuticals, electronics, laboratories |
| Wastewater COD 500-2000 mg/L | MBR + UF + RO | Reuse water quality Zero liquid discharge | Textile dyeing, metal plating, oil refining |
Multi-media filters (anthracite, sand, garnet layers) remove particles >20 microns, reducing membrane fouling by 85%. Activated carbon adsorbers eliminate residual chlorine (<0.1 ppm required for polyamide RO membranes), organic compounds, and taste/odor issues. Antiscalant dosing systems inject polymer formulations that prevent calcium carbonate, calcium sulfate, and silica scaling—extending membrane cleaning intervals from 3 months to 12+ months. Cartridge filter housings (5-micron nominal) provide final particulate barrier before high-pressure pumps.
Our systems integrate Dow Filmtec, Hydranautics, or Toray membranes—selected based on water chemistry analysis. Spiral-wound RO elements (4-inch, 8-inch diameters) are arranged in 4:2:1 or 6:3:1 staging for optimal salt rejection and recovery. Pressure vessels in 316L stainless steel or fiberglass handle 6-8 membrane elements per vessel, with configurations from single-vessel skids to 200-vessel arrays for large municipal plants. UF membrane cassettes with 0.5-1.0 million fibers per module deliver 20-100 GPM per unit.
Vertical multistage centrifugal pumps (Grundfos, CNP brands) generate 150-1200 PSI required for RO operation, with VFD control matching feedwater TDS fluctuations. For seawater systems, pressure exchangers (isobaric chambers) recover 90-96% of brine energy, reducing specific energy consumption from 8-12 kWh/m³ to 2.5-4.0 kWh/m³—slashing operating costs by $180,000 annually for a 1 MGD SWRO plant.
Siemens or Allen-Bradley PLC controllers automate startup sequences, CIP (clean-in-place) cycles, and shutdown protocols. Real-time monitoring tracks 15+ parameters: feed pressure, permeate flow, conductivity, pH, temperature, differential pressure across membranes. SCADA dashboards enable remote operation via smartphone apps. Predictive maintenance algorithms alert operators 2-4 weeks before membrane cleaning requirements, preventing unexpected downtime.
| Specification | Melko Engineering Standard | Industry Typical | Your Benefit |
|---|---|---|---|
| Design Life | 20 years (structural) 7-10 years (membranes) | 15 years 5-7 years | Lower total cost of ownership |
| Recovery Rate | 75-85% (brackish) 40-50% (seawater) | 65-75% 35-40% | Reduced wastewater discharge costs |
| Automation Level | Fully automatic PLC Remote SCADA standard | Semi-automatic SCADA optional (extra cost) | Reduced labor costs by 60% |
| Energy Efficiency | 3.2-3.8 kWh/m³ (BWRO) 2.8-3.5 kWh/m³ (SWRO with ER) | 4.5-5.5 kWh/m³ 4.0-5.0 kWh/m³ | $35,000-$60,000 annual savings (1 MGD) |
| Membrane Cleaning Interval | 12-18 months | 3-6 months | 75% reduction in chemical costs + labor |
| Warranty | 24 months full system Lifetime technical support | 12 months Support ends after warranty | Risk-free investment protection |
| Lead Time | 8-12 weeks (standard) 4-6 weeks (emergency) | 16-24 weeks | Faster revenue generation / problem resolution |
Our multi-stage RO + EDI + UV sterilization systems produce USP Purified Water meeting
Triple-pass RO + mixed-bed EDI + UV oxidation + final UF polishing achieves SEMI F63 Grade 1 water: resistivity >18.2 MΩ·cm, TOC<1 ppb, particles
Demineralized water production via RO + ion exchange prevents scale and corrosion in high-pressure boilers (>600 PSI steam). Meeting ASME consensus guidelines for boiler water quality, our systems reduce silica to<20 ppb, total hardness to <0.01 ppm, and conductivity to <0.2 μS/cm. Condensate polishing systems with deep-bed ion exchangers remove corrosion products (iron, copper) returning to boilers, extending tube life by 40-60%. Energy-efficient design reduces auxiliary power consumption to<0.5% of plant output.
Chlorine-free water production via UV disinfection + UF + RO eliminates taste/odor issues in soft drinks, brewing, and dairy processing while meeting FDA 21 CFR 110 current good manufacturing practices. Our integrated CIP (clean-in-place) skids with hot water (85°C) and sanitizer loops clean process lines between production runs, validated for 5-log pathogen reduction. Reverse osmosis permeate (TDS<50 ppm) reduces mineral content in final products, improving shelf stability and flavor consistency. Capacities: 5-500 GPM continuous operation.
Our water treatment engineers provide comprehensive services to ensure your purification system delivers optimal performance and ROI:
Laboratory Water Testing: Send 1-liter sample for full analysis—TDS, hardness, alkalinity, chloride, sulfate, silica, iron, manganese, bacteria count (15-parameter report within 5 business days)
Pilot Testing: For challenging water sources (>10,000 ppm TDS, high silica, organic fouling), we provide mobile pilot units (10-50 GPM) for 30-90 day on-site trials confirming membrane selection and recovery rates
3D System Layout: CAD drawings with equipment placement, piping isometrics, electrical schematics, and civil foundation details for seamless integration into existing facilities
Energy Consumption Modeling: Calculate operating costs based on local electricity rates, water costs, and discharge fees—with payback period analysis comparing purification system investment to current water procurement methods
Regulatory Compliance Review: Verify system design meets local drinking water standards (EPA, WHO, EU Directive), discharge permits, and industry-specific requirements (FDA, ASME, SEMI)
Request your free water analysis today—our engineers respond within 24 hours with preliminary system recommendations and budget pricing. For complex projects (>100 GPM or specialty applications), we offer on-site consultations to assess space constraints, utility availability, and operational requirements. No commitment required.
