1. Case Basic Information
1.1 Company Overview
Hella Water Treatment Equipment Technology Co., Ltd. is a leading provider of high-performance seawater desalination solutions, specializing in large-scale reverse osmosis (RO) systems for municipal, industrial, and commercial fresh water supply. With over 20 years of industry experience, the company adheres to international standards (ISO, ASME, ASTM) and offers end-to-end services from design, production, and on-site installation to after-sales support. Its SWRO systems are deployed globally, delivering reliable fresh water in coastal regions and offshore platforms. For more seawater desalination solutions, visit [desalination].
1.2 Project Background
This project targets large-scale seawater desalination to address fresh water scarcity in coastal areas, offshore projects, or arid coastal regions. The system processes 500m³/h of seawater (TDS ≤38,000 ppm) to produce 180m³/h of qualified fresh water, meeting drinking water, industrial production, or municipal supply needs. The 8-stage filtration design integrates energy recovery technology for high efficiency, with a focus on stability, corrosion resistance, and low operational costs.
1.3 Raw Water & Target Water Quality Data
Raw Water Quality (Seawater)
| Parameter | Value Range | Unit |
|---|---|---|
| Total Dissolved Solids (TDS) | ≤38,000 | ppm |
| Conductivity | ≥50,000 | μS/cm |
| pH | 7.5-8.5 | pH |
| Turbidity | ≤5 | NTU |
| Chlorides (Cl⁻) | ≤20,000 | mg/L |
| Hardness (as CaCO₃) | ≤1,500 | mg/L |
| Operating Temperature | 5℃-45℃ | ℃ |
Target Water Quality (Desalinated Water)
| Parameter | Standard Value | Unit |
|---|---|---|
| TDS | <400 | mg/L |
| Conductivity | <500 | μS/cm |
| Turbidity | <0.1 | NTU |
| Total Hardness | 8-12 | °fH |
| Calcium (Ca) | <10 | mg/L |
| Magnesium (Mg) | <10 | mg/L |
| Sodium (Na) | <10 | mg/L |
| Chlorides (Cl⁻) | <200 | mg/L |
| Bacteria Removal Rate | ≥99.99% | – |
| Desalination Rate | >99% | – |
2. Core Pain Points and Requirements of the Project
2.1 Raw Water Quality Pain Points
- Extreme High Salinity: TDS up to 38,000 ppm requires high-efficiency desalination technology to meet fresh water standards.
- Corrosiveness: High chloride content (≤20,000 mg/L) is highly corrosive to equipment, demanding corrosion-resistant materials.
- Microbial Contamination: Seawater contains bacteria, algae, and shellfish larvae that can foul RO membranes and pipelines.
- Scaling Risk: High hardness and dissolved salts cause membrane scaling, reducing system efficiency and lifespan.
- Turbidity and Suspended Solids: Turbidity ≤5 NTU and suspended solids require thorough pretreatment to protect RO membranes.
2.2 Project Operation Requirements
- Output Capacity: 180 m³/h of desalinated water, with seawater inlet capacity 500 m³/h (recovery rate 35-45%).
- Energy Efficiency: Equipped with energy recovery devices to reduce power consumption; total operating power 700 kW.
- Automation Level: Fully automatic PLC control with touchscreen, remote monitoring (APP/networking), and automatic start/stop based on water tank levels.
- Durability: Corrosion-resistant materials (SUS304, SS316, duplex steel 2507, FRP) for long-term seawater exposure.
- Safety & Protection: High/low pressure switch protection, overload protection, conductivity alarm, and liquid level alarm.
- Compliance: Meet WHO drinking water standards and local environmental regulations for brine discharge.
- Design Service Life: 12 years, with RO membrane replacement cycle ≥3 years.
3. Hella Water Customized Solutions
3.1 System Model and Core Configuration
Hella Water provides the HLDES-180T Seawater Desalination SWRO System, integrating 8-stage filtration, energy recovery, and intelligent control modules. The detailed configuration is as follows:
| No. | Part Name | Description |
|---|---|---|
| 1 | Raw Water System | 2 sets of raw water pumps (flow 250m³/h, head 40m) + water inlet electric valves |
| 2 | Pretreatment System | NaClO generator (bacteria/algae removal) + 8 dosing systems (PE tanks, 10L/h pumps) + 3 multi-stage filter tanks (8000KG composite media) + high-speed filter (FRP body) |
| 3 | Security Filtration | Precision filter (PP polymer filter elements) to remove ≥5μm particles |
| 4 | SWRO Desalination System | 4 sets of high-pressure pumps (flow 120m³/h, head 520m) + 90 fiberglass membrane shells (1000PSI) + 360 RO membranes (8040 type, 99.5% desalination rate) |
| 5 | Energy Recovery System | Energy recycle device (21 bar, duplex steel 2507) to reduce energy consumption |
| 6 | Cleaning System | Cleaning pump + 1000L cleaning tank + CEB (Continuous Energy Backwash) system |
| 7 | Control System | PLC + touchscreen (IP54 protection), pressure switches, conductivity meter, remote monitoring capability |
| 8 | Piping & Frame | High-pressure pipes (SS316), low-pressure pipes (PVC); anti-corrosion carbon steel frame |
| 9 | Storage & Disinfection | Pure water tank + post-disinfection adjustment module |
For more details on reverse osmosis systems, visit [reverse osmosis].
3.2 Key Technical Parameters of HLDES-180T
| Parameter | Specification |
|---|---|
| Seawater Inlet Capacity | 500 m³/h |
| Fresh Water Output | 180 m³/h |
| Desalination Rate | >99% (considering membrane decay) |
| Recovery Rate | 35-45% (adjustable) |
| Operating Pressure | 5.5-6.5 MPa |
| Total Operating Power | 700 kW |
| Power Supply | 380V/3P/50Hz |
| Operating Temperature | 5℃-45℃ |
| Frame Material | Anti-corrosion carbon steel |
| Pipe Material | High-pressure: SS316; Low-pressure: PVC |
| Lead Time | 60 days |
| Design Service Life | 12 years |
3.3 Process Design
3.3.1 Pretreatment Process
- NaClO Generator: Produces sodium hypochlorite to kill bacteria, algae, and shellfish larvae in seawater.
- Multi-Stage Filter Tanks: 3 tanks with composite media (8000KG total) remove suspended solids, organic matter, and residual chlorine.
- High-Speed Filter: FRP body with PP filter elements further reduces turbidity to <0.5 NTU.
- Dosing Systems: 8 sets of dosing pumps add flocculants, pH adjusters, and scale inhibitors to prevent scaling and membrane fouling. For chemical dosing systems, see [chemical dosing system].
3.3.2 Core SWRO Desalination Process
- High-Pressure Pumps: 4 pumps provide 5.5-6.5 MPa pressure to drive seawater through RO membranes.
- RO Membrane System: 360 8040-type RO membranes (99.5% single-element desalination rate) in 90 membrane shells for deep desalination.
- Energy Recovery Device: Recovers energy from concentrated brine, reducing power consumption by 30-40% compared to traditional systems.
3.3.3 Post-Treatment & Control
- CEB System: Continuous energy backwash maintains membrane performance and extends lifespan.
- Post-Disinfection: Adjusts water quality to meet drinking/industrial standards.
- PLC Control: Automates pump operation, dosing, backwashing, and alarm responses; remote monitoring enables real-time status tracking. For pre-treatment systems, see [pre treatment filtration system].
4. Project Effect Verification
4.1 Desalinated Water Quality Test Results
| Parameter | Raw Water Value | Desalinated Water Value | Removal Efficiency |
|---|---|---|---|
| TDS | ≤38,000 mg/L | <400 mg/L | ≥99.0% |
| Turbidity | ≤5 NTU | <0.1 NTU | ≥98.0% |
| Chlorides (Cl⁻) | ≤20,000 mg/L | <200 mg/L | ≥99.0% |
| Total Hardness | ≤1,500 mg/L | 8-12 °fH | ≥99.0% |
| Calcium (Ca) | – | <10 mg/L | ≥99.0% |
| Sodium (Na) | – | <10 mg/L | ≥99.5% |
| Bacteria Removal Rate | – | ≥99.99% | – |
4.2 System Operation Performance
- Stability: Continuous 72-hour operation shows water output fluctuation ≤±2%, TDS stable at <350 mg/L.
- Energy Efficiency: Energy recovery device reduces energy consumption to ~3.9 kWh/m³ of fresh water, reaching industry advanced levels.
- Corrosion Resistance: All seawater-contacting components (SS316, duplex steel 2507) show no corrosion after 6-month operation.
- Automation Effectiveness: Remote monitoring and automatic start/stop reduce manual intervention by 90%; CEB system extends membrane lifespan to 3+ years.
- Recovery Efficiency: Recovery rate reaches 42%, exceeding the design range of 35-45%.
4.3 Compliance and Application
- Standards Compliance: Meets WHO drinking water standards, ISO 9001 quality management requirements, and ASME membrane system standards.
- Case Validation: Successfully deployed in coastal municipal water supply and offshore platform projects, with customer satisfaction ≥97%. For industrial water filtration solutions, visit [industrial water filtration].
5. Case Corresponding Product Quotation Description
5.1 Main Equipment Quotation
| Item | Model | Qty | Unit Price (USD) | Total Price (USD) | Description |
|---|---|---|---|---|---|
| 180m³/H SWRO Desalination System | HLDES-180T | 1 | 1,715,000 | 1,715,000 | Complete system including pretreatment, RO, energy recovery, control, and post-disinfection; EXW price |
5.2 Terms & Conditions
| Term Type | Details |
|---|---|
| Price Inclusions | Complete filter system, controller cabinet, international standard packaging |
| Power Supply | 380V/3P/50Hz (customizable for other voltages) |
| Payment Term | T/T: 35% deposit for production, 30% during production, 30% before shipment, 5% after 1-year warranty |
| Lead Time | 60 days from receipt of deposit |
| Warranty | 12 months from delivery; free repair/replacement for non-human-induced failures |
| Installation & Maintenance | Free manual, video guides, and online support; on-site installation available (customer bears engineer costs: visa, flights, accommodation, labor) |
| Customization | Available for capacity, pressure, or water quality requirements (price/production time varies) |
5.3 Annual Consumables Cost (Estimated)
| Consumable Name | Specification | Unit Price (USD) | Annual Consumption | Annual Cost (USD) |
|---|---|---|---|---|
| PP Filter Elements | Precision filter | 2/piece | 600 pieces | 1,200 |
| Dosing Chemicals | Flocculant/pH adjuster/scale inhibitor | 70/bottle | 36 bottles | 2,520 |
| RO Membranes (10% replacement) | 8040 type | 720/piece | 36 pieces | 25,920 |
| Multi-Stage Filter Media | Composite media | 2/kg | 800 kg | 1,600 |
| Total | – | – | – | 31,240 |
6. Common Questions (FAQ)
6.1 Maintenance and Consumables
Q1: How often do key components need to be replaced?A1: PP filter elements (1 month), dosing chemicals (3 bottles/month), RO membranes (3 years), and multi-stage filter media (3 years). Cycles depend on raw water quality and operation intensity. For replacement parts, visit [accessory supporting equipment].
Q2: What is the CEB system’s role?A2: The Continuous Energy Backwash system automatically cleans RO membranes during operation, preventing fouling and maintaining desalination efficiency without manual intervention.
6.2 Warranty and Support
Q1: What is covered under the 12-month warranty?A1: The warranty includes manufacturing defects in equipment (pumps, membranes, control system). Consumables (filters, chemicals) and human-induced damages are excluded.
Q2: Can Hella Water provide technical support for overseas projects?A2: Yes. 7×24 online technical support is available; on-site service is provided upon request (customer bears related costs). Remote monitoring enables real-time troubleshooting.
6.3 Installation and Operation
Q1: What preparations are required before installation?A1: The customer needs to prepare a flat installation site (≥200㎡), stable power supply (380V/3P/50Hz), seawater intake pipeline, and brine discharge channel (300-500 meters offshore recommended).
Q2: How to handle brine discharge?A2: Concentrated brine (TDS ~60,000 ppm) is discharged 300-500 meters offshore to ensure rapid dilution, complying with marine environmental regulations.
6.4 System Performance
Q1: Can the system operate in extreme temperatures?A1: The system’s operating temperature range is 5℃-45℃. For low temperatures (≤5℃), an optional heating module can be added; for high temperatures (>45℃), cooling measures are recommended to protect RO membranes.
Q2: What is the system’s response to power outages?A2: The system shuts down automatically to protect equipment. After power restoration, it requires manual restart to ensure operational safety. Optional UPS backup is available for critical applications.
Would you like me to help you create a detailed operation and maintenance manual for this system, including step-by-step startup/shutdown procedures, troubleshooting flowcharts, and remote monitoring setup guides?
English 
Chinese 
German 
Russian 
Japanese 
French 
Dutch 
Italian 