1. Case Basic Information
1.1 Company Overview
Hella Water Treatment Equipment Technology Co., Ltd. is a professional provider of high-performance seawater desalination solutions, specializing in the R&D, production, and integration of reverse osmosis (RO) systems for marine and coastal applications. The company adheres to international standards such as ASME, ASTM, and GB, offering reliable, energy-efficient desalination equipment certified by ISO and NSF. Its products serve municipal water supply, industrial production, and offshore projects globally. For more seawater desalination solutions, visit [desalination].
1.2 Project Background
This project addresses the water scarcity issue in a coastal area or offshore scenario (e.g., coastal cities, islands, or offshore platforms) by converting seawater into usable fresh water. The system is designed to produce 400m³ of fresh water per day (17m³/h) with a single-stage RO process, meeting the demand for drinking water or industrial water supply. It features an energy recovery device to optimize efficiency and a containerized design for easy installation and transportation.
1.3 Raw Water Quality Data
The raw water is coastal seawater with the following key parameters:
| Parameter | Value Range | Unit |
|---|---|---|
| Total Dissolved Solids (TDS) | ≤30,000 | ppm |
| Chemical Oxygen Demand (COD) | ≤3 | ppm |
| Suspended Solids (SS) | ≤15 | ppm |
| Turbidity | ≤10 | NTU |
| pH | 7.5-8.5 | pH |
| Free Chlorine | <0.1 | ppm |
| Temperature | 5℃-45℃ | ℃ |
2. Core Pain Points and Requirements of the Project
2.1 Raw Water Quality Pain Points
- High Salinity: TDS up to 30,000 ppm makes seawater unfit for direct use, requiring high-efficiency desalination technology.
- Suspended Solids and Colloids: Presence of SS, colloids, and marine microbes can cause RO membrane fouling, reducing system efficiency and lifespan.
- Corrosiveness: Seawater’s high chloride content is corrosive to equipment, demanding corrosion-resistant materials.
- Environmental Sensitivity: Discharge of concentrated seawater requires compliance with environmental regulations to avoid marine ecosystem impact.
2.2 Produced Water Quality Requirements
- Desalination Performance: TDS of produced water ≤500 ppm, desalination rate ≥97% (accounting for membrane decay).
- Purity Indicators: SS ≤1 ppm, turbidity ≤0.5 NTU, meeting drinking water or industrial water standards.
- Safety Compliance: Free of harmful microorganisms and chemicals; compliant with WHO drinking water guidelines or industrial water specifications.
- Stability: Water quality fluctuation ≤±5% during continuous operation, even with raw water parameter variations.
2.3 Project Scale and Operation Requirements
- Output Capacity: 400m³/day (17m³/h) of fresh water, supporting 24/7 continuous operation.
- Energy Efficiency: Equipped with energy recovery device (ERD) to reduce power consumption; operating power 105 kW (VFD), rated power 125 kW.
- Automation Level: Fully automatic control (PLC+SCADA) with remote monitoring, reducing manual intervention.
- Durability: Corrosion-resistant materials (SS2205, duplex steel 2507, FRP) for long-term seawater exposure; design service life 12 years.
- Safety Features: Low/high pressure protection, water level control, conductivity overlimit alarm, and automatic shutdown for abnormalities.
- Environmental Friendliness: Use of NSF-certified, eco-friendly chemicals; concentrated seawater discharged 300-500 meters offshore for rapid dilution.
3. Hella Water Customized Solutions
3.1 System Model and Core Configuration
Hella Water provides the SWRO-600TPD Seawater Desalination RO Plant (containerized design), integrating seawater intake, pretreatment, RO desalination, chemical dosing, and control modules. The detailed configuration is as follows:
| No. | Part Name | Description |
|---|---|---|
| 1 | Seawater Intake System | Mobile intake port (SWRO-IP01, duplex steel 2507), easy to clean and install |
| 2 | Raw Water Pump | Model ABD, SS2205 material, Q=40m³/h, H=36m, P=8kW |
| 3 | Pretreatment System | Ultra-high speed filter (Φ2000×2250mm, rubber-lined carbon steel) + 5μm security filter (FRP material) |
| 4 | Dosing System | 2 sets of P06 metering pumps (PVC material), 100L PE dissolving tanks; chemicals: bactericide (hypochlorite), scale inhibitor, reducing agent |
| 5 | RO Desalination System | 25 Toray SWRO-8040 membrane elements (TFC material, rejection rate 99.7%), 5 FRP pressure vessels (R8040-4) |
| 6 | High-Pressure Pump | Model ABD, SS2205 material, Q=40m³/h, P=52bar, P=80kW (rated); Alpha VFD (FC111P250K) |
| 7 | Energy Recovery Device (ERD) | Turbo type (IPX/ERI), Q=20m³/h, P=21bar, duplex steel 2507, 0 kW power consumption |
| 8 | Control System | Siemens PLC + Schneider electrical components, SCADA for centralized monitoring; 4 conductivity meters, 5 flow meters, 2 ORP meters |
| 9 | Chemical Cleaning System | Cleaning pump (CNP, SS304, Q=20m³/h, P=35m, P=2.5kW), 1000L PE cleaning tank, 40” precision filter |
| 10 | Pipes and Valves | Low-pressure: UPVC (Taiwan Huan Qi); high-pressure: SS2205/2507 (Qingdao Chilong); electric valves (DN80/DN50) |
| 11 | Container/Frame | 40ft HQ container with anti-corrosion treatment, air conditioner, and fans |
For more details on industrial reverse osmosis systems, visit [reverse osmosis].
3.2 Key Technical Parameters of SWRO-600TPD
| Parameter | Specification |
|---|---|
| Daily Water Output | 400 m³ (17 m³/h) |
| Raw Water Requirements | TDS≤30,000 ppm, SS≤15 ppm, turbidity≤10 NTU |
| Produced Water TDS | ≤500 ppm |
| Desalination Rate | ≥97% |
| Recovery Rate | ≥40% (single-stage RO) |
| Operating Pressure | <6.0 MPa |
| Operating Temperature | 5℃-45℃ |
| Power Supply | 380V/50Hz, 3-phase |
| Operating Power (VFD) | 105 kW |
| Rated Power | 125 kW |
| Control Mode | PLC automatic + remote monitoring |
| System Dimensions | 40ft container |
| Design Service Life | 12 years |
3.3 Process Design
3.3.1 Pretreatment Process
- Ultra-High Speed Filter: Removes SS, colloids, and marine microbes; filtration speed 45m³/h, automatic backwashing, ensuring pretreatment water SDI≤1.
- 5μm Security Filter: Captures fine particles to prevent RO membrane damage; filter element material PP (UPVC).
3.3.2 Core RO Desalination Process
- Single-Stage RO Configuration: 25 SWRO membranes (5 pressure vessels, 5 membranes each) for deep desalination; membrane rejection rate 99.7% (single element).
- Energy Recovery Device: Turbo ERD recovers energy from concentrated seawater, reducing high-pressure pump power consumption by 30-40%.
- Chemical Dosing:
- Bactericide (3ppm): Electrolytic saturated salt solution produces hypochlorite, eco-friendly.
- Reducing agent (5ppm, sodium hydrogen sulfite): Removes residual chlorine to protect RO membranes.
- Scale inhibitor (6ppm, NSF-certified): Prevents membrane scaling. For chemical dosing systems, see [chemical dosing system].
3.3.3 Post-Treatment and Control
- Concentrated Seawater Discharge: Discharged 300-500 meters offshore via DN50 valves, rapidly diluted by tides.
- Automatic Control: SCADA system monitors water intake, filtration, desalination, and dosing; 实现 automatic start/stop, backwashing, and chemical cleaning.
- Safety Protection: Low feed water pressure alarm, high RO pressure automatic backwashing, conductivity overlimit discharge, and pure water tank level control.
4. Project Effect Verification
4.1 Produced Water Quality Test Results
After treatment by the SWRO-600TPD system, the produced water meets the preset requirements, with key indicators as follows:
| Parameter | Raw Water Value | Produced Water Value | Unit |
|---|---|---|---|
| TDS | ≤30,000 | ≤500 | ppm |
| Desalination Rate | – | ≥97% | – |
| Turbidity | ≤10 | ≤0.5 | NTU |
| SS | ≤15 | ≤1 | ppm |
| Free Chlorine | <0.1 | 0 | ppm |
| pH | 7.5-8.5 | 7.0-8.0 | pH |
| Bacteria Removal Rate | – | ≥99.99% | – |
4.2 System Operation Performance
- Stability: Continuous 72-hour operation test shows water output fluctuation ≤±3%, TDS stable at ≤450 ppm, no membrane fouling.
- Energy Efficiency: ERD reduces energy consumption to ~3.5 kWh/m³ of fresh water, reaching industry advanced levels.
- Corrosion Resistance: All seawater-contacting components (SS2205, duplex steel 2507) show no corrosion after 6-month operation.
- Automation Effectiveness: Unmanned on-site operation; central control room realizes remote monitoring and fault diagnosis, reducing labor costs by 80%.
- Environmental Compliance: Concentrated seawater discharge meets marine environmental standards; no chemical residues detected in surrounding seawater.
4.3 Compliance and Certifications
- Standards Compliance: The system complies with HG/T20653, JB2932, and ASME/ASTM standards; materials meet corrosion-resistant requirements for seawater applications.
- Industry Application: Successfully deployed in coastal municipal water supply and offshore platform projects, with customer satisfaction ≥96%. 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 |
|---|---|---|---|---|---|
| 400m³/Day Seawater Desalination RO Plant | SWRO-600TPD | 1 | 165,500 | 165,500 | Containerized system including intake, pretreatment, RO, dosing, control, and cleaning modules; EXW price |
Note: The price is based on 380V/50Hz 3-phase power supply. Customization for other voltages or specifications will affect pricing and production time.
5.2 Payment Terms & Logistics
| Term Type | Details |
|---|---|
| Payment Term | T/T (Telegraphic Transfer): 50% deposit for production, 50% balance paid before shipment |
| Lead Time | 30 days from receipt of deposit (containerized production + testing) |
| Packaging | 40ft HQ container with anti-corrosion treatment, including air conditioner and fans |
| Warranty | 12 months from delivery; free repair/replacement for non-human-induced failures; free 1-year spare parts; lifetime technical support (24-hour response) |
| Acceptance | Contact Hella Water immediately for damaged goods or quality issues to claim rights |
5.3 Chemical Consumables Price List
| Consumable Name | Dosage per Ton | Unit Price (USD/kg) | Monthly Consumption (Est.) | Monthly Cost (USD) |
|---|---|---|---|---|
| Bactericide (Hypochlorite) | 3ppm | 1.7 | 180 kg | 306 |
| Reducing Agent (Sodium Hydrogen Sulfite) | 5ppm | 0.31 | 300 kg | 93 |
| Scale Inhibitor (NSF-certified) | 6ppm | 3.7 | 360 kg | 1,332 |
| Total Monthly Cost | – | – | – | 1,731 |
6. Common Questions (FAQ)
6.1 Maintenance and Consumables
Q1: What is the replacement cycle for key components?A1: RO membranes (3-5 years), security filter elements (3-6 months), ultra-high speed filter media (2-3 years), and chemical dosing pumps (5-7 years). Cycles vary based on raw water quality and operation intensity. For replacement parts, visit [accessory supporting equipment].
Q2: How often is chemical cleaning required for RO membranes?A2: Recommended every 6-12 months under normal operation. The frequency may increase if raw water SS or turbidity exceeds standard; use the integrated CIP cleaning system with acid/alkaline cleaning agents.
6.2 Warranty and After-Sales Service
Q1: What is covered under the warranty?A1: The 12-month warranty covers manufacturing defects in equipment components (pumps, membranes, valves, control system). Consumables (filter elements, chemicals) and human-induced damages are excluded. Free 1-year spare parts and lifetime technical support are provided.
Q2: How to get technical support if the system malfunctions?A2: Contact Hella Water’s 24-hour technical support team via phone or email. Remote troubleshooting is available for most issues; on-site service is provided if required (customer bears travel and accommodation costs for engineers).
6.3 Installation and Operation
Q1: What preparations are required before installation?A1: The customer needs to prepare a flat installation site for the 40ft container, stable power supply (380V/50Hz 3-phase), and seawater intake/discharge pipelines. The mobile intake port can be installed near the beach without complex infrastructure.
Q2: Can the system operate in extreme temperatures?A2: The system’s operating temperature range is 5℃-45℃. For low-temperature environments (≤5℃), an optional heating module can be added; for high temperatures (>45℃), cooling measures are recommended to protect RO membranes.
6.4 System Performance
Q1: How does the system handle raw water TDS fluctuations?A1: The VFD-controlled high-pressure pump and adaptive control system adjust operating pressure in real-time to compensate for TDS fluctuations, ensuring stable desalination rate and produced water quality.
Q2: What is the energy consumption per cubic meter of fresh water?A2: With the energy recovery device, the system’s energy consumption is ~3.5 kWh/m³, which is 30-40% lower than traditional seawater desalination systems without ERD.
Would you like me to help you create a detailed operation manual for this system, including step-by-step startup/shutdown procedures, troubleshooting guides, and maintenance schedules?
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