1. Case Basic Information
1.1 Company Overview
Hella Water Treatment Equipment Technology Co., Ltd. is a professional provider of high-performance brackish water desalination solutions, specializing in multi-stage reverse osmosis (RO) systems for industrial, municipal, and commercial water purification. The company adheres to international standards (ASME, ASTM, GB) and offers end-to-end services from design to after-sales support. Its products are widely used in areas with limited fresh water resources, delivering reliable desalination performance. For more brackish water desalination systems, visit [brackish water desalination system].
1.2 Project Background
This project targets brackish water purification (e.g., underground brackish water, industrial brackish wastewater) requiring graded desalination to meet diverse water quality needs. The three-stage RO system processes brackish water with varying TDS levels (up to 35,000 ppm) to produce purified water for scenarios such as industrial production, irrigation, or municipal use. The system is containerized for easy transportation and installation, with a design focus on high recovery rates and energy efficiency.
1.3 Raw Water & Target Water Quality Data
Raw Water Quality (Brackish Water)
| Parameter | Value Range | Unit |
|---|---|---|
| Total Dissolved Solids (TDS) | ≤35,000 | ppm |
| Salinity | 6.6 g/L | g/L |
| pH | 6.5-8.5 | pH |
| Turbidity | ≤5 | NTU |
| Suspended Solids (SS) | ≤10 | mg/L |
| Hardness (as CaCO₃) | ≤500 | mg/L |
| Chlorides (Cl⁻) | ≤15,000 | mg/L |
Target Water Quality (Three-Stage Output)
| Stage | Inlet TDS (ppm) | Output TDS (ppm) | Water Output (m³/h) | Recovery Rate | Operating Pressure (bar) |
|---|---|---|---|---|---|
| 1st | ≤7,000 | ≤100 | 30 | 60% | 20 |
| 2nd | ≤15,000 | ≤300 | 12 | 60% | 40 |
| 3rd | ≤35,000 | ≤600 | 4 | 50% | 60 |
2. Core Pain Points and Requirements of the Project
2.1 Raw Water Quality Pain Points
- High Salinity Gradient: Brackish water TDS ranges from 7,000 to 35,000 ppm, requiring graded desalination for different use cases.
- Scaling Risk: High hardness and chlorides cause RO membrane scaling, reducing system efficiency and lifespan.
- Suspended Solids and Turbidity: SS and turbidity lead to membrane fouling, increasing maintenance frequency.
- Corrosiveness: High chloride content is corrosive to equipment, demanding corrosion-resistant materials.
2.2 Project Operation Requirements
- Desalination Performance: Desalination rate ≥99% (first two years for 1st/2nd stages), ≥98% for 3rd stage.
- Recovery Efficiency: Stage recovery rates ≥50-60% to optimize water utilization.
- Automation Level: Fully automatic PLC control with real-time monitoring (TDS, pressure, flow) and automatic cleaning.
- Durability: Corrosion-resistant materials (SS304, SS2205, duplex steel 2507, fiberglass) for long-term operation.
- Energy Efficiency: Equipped with energy recovery devices (ERD) to reduce power consumption; total operating power ~139 kW.
- Installation & Mobility: Containerized design (2×40ft containers) for easy transportation and on-site deployment.
- Reliability: Design service life ≥10 years; RO membrane replacement cycle ≥3 years.
3. Hella Water Customized Solutions
3.1 System Model and Core Configuration
Hella Water provides the HLBW-50T Three-Stage Brackish Water RO System, integrating pretreatment, three-stage RO desalination, energy recovery, and control modules. The detailed configuration is as follows:
| No. | Part Name | Description |
|---|---|---|
| 1 | Pretreatment System | Multi-media filter (quartz sand: 7 tons) + activated carbon filter (1.6 tons) + 40”30-core precision filter |
| 2 | Raw Water System | Booster pump (ZS65-50-160, SS304, Q=50m³/h, P=7.5kW) + level transmitter |
| 3 | Three-Stage RO System | – 1st stage: 6 fiberglass pressure vessels, 30 DOW BW30FR-400 membranes, high-pressure pump (CDM42-11, 45kW)- 2nd stage: 3 fiberglass pressure vessels, 15 DOW SW30HRLE-400 membranes, high-pressure pump (HL20-40, 30kW)- 3rd stage: Pressure vessels, 10 DOW XC70 membranes, high-pressure pump (HL8-60, 30kW) |
| 4 | Energy Recovery Device | 2 sets of ERD (Turbo, duplex steel 2507) to reduce energy consumption |
| 5 | Dosing System | Scale inhibitor dosing (100L PE tank + RD-05-07 pump) to prevent membrane scaling |
| 6 | Cleaning System | CIP cleaning system (CHM15-30 pump, 1000L PE tank, 40”10-core precision filter) |
| 7 | Control System | Siemens PLC + touchscreen, Schneider electrical components, high/low pressure protection, conductivity meters |
| 8 | Disinfection System | 2 sets of 500W UV sterilizers (SS304) for microbial control |
| 9 | Container & Piping | 2×40ft containers; high-pressure pipelines (SS2205), low-pressure pipelines (UPVC) |
For more details on reverse osmosis systems, visit [reverse osmosis].
3.2 Key Technical Parameters of HLBW-50T
| Parameter | Specification |
|---|---|
| Total Inlet Capacity | 50 m³/h |
| Total Output Capacity | 46 m³/h (30+12+4) |
| Operating Temperature | 5℃-45℃ |
| Desalination Rate | 1st/2nd stage ≥99% (2 years), 3rd stage ≥98% |
| Total Operating Power | ~139 kW (45+30+30+22+12) |
| Power Supply | 380V/3P/50Hz |
| Container Size | 2×40ft containers |
| Lead Time | 40 days |
| Design Service Life | ≥10 years |
3.3 Process Design
3.3.1 Pretreatment Process
- Multi-media Filter: Removes SS and turbidity; automatic backwashing (15 min backwash + 10 min forward wash every 24 hours); quartz sand replacement cycle 36-48 months.
- Activated Carbon Filter: Adsorbs organic matter and residual chlorine; protects RO membranes from oxidation; replacement cycle 12-18 months.
- Precision Filter (5μm): Captures fine particles to prevent membrane damage; filter element replacement every 2 months. For pre-treatment systems, see [pre treatment filtration system].
3.3.2 Three-Stage RO Desalination
- 1st Stage RO: Treats low-salinity brackish water (≤7,000 ppm) to TDS ≤100 ppm; 30 BW30FR-400 membranes for high fouling resistance.
- 2nd Stage RO: Processes medium-salinity water (≤15,000 ppm) to TDS ≤300 ppm; 15 SW30HRLE-400 membranes for enhanced desalination.
- 3rd Stage RO: Handles high-salinity water (≤35,000 ppm) to TDS ≤600 ppm; 10 XC70 membranes for extreme conditions.
3.3.3 Energy Recovery & Control
- ERD System: Recovers energy from concentrated brine, reducing high-pressure pump power consumption by 20-30%.
- Chemical Dosing: Scale inhibitor converts CO₂ to removable ions, preventing membrane scaling. For chemical dosing systems, see [chemical dosing system].
- PLC Control: Automates pump operation, backwashing, CIP cleaning, and alarm responses (high/low pressure, TDS overlimit); three-level management authority.
4. Project Effect Verification
4.1 Purified Water Quality Test Results
| Stage | Inlet TDS (ppm) | Produced Water TDS (ppm) | Desalination Rate |
|---|---|---|---|
| 1st | 7,000 | ≤100 | ≥98.6% |
| 2nd | 15,000 | ≤300 | ≥98.0% |
| 3rd | 35,000 | ≤600 | ≥98.3% |
| Turbidity | ≤5 NTU | ≤0.1 NTU | ≥98.0% |
| SS | ≤10 mg/L | ≤1 mg/L | ≥90.0% |
| Hardness | ≤500 mg/L | ≤5 mg/L | ≥99.0% |
4.2 System Operation Performance
- Recovery Efficiency: Stage recovery rates reach 60% (1st/2nd) and 50% (3rd), exceeding design requirements.
- Energy Saving: ERD reduces total energy consumption to ~3.0 kWh/m³ of purified water.
- Stability: Continuous 72-hour operation shows water quality fluctuation ≤±2%, no membrane fouling or pressure spikes.
- Durability: Corrosion-resistant components (SS2205, duplex steel 2507) pass 6-month high-salinity exposure testing.
- Mobility: Containerized design enables on-site installation within 1 week, suitable for remote areas.
4.3 Compliance and Application
- Standards Compliance: Meets HG/T20653, JB2932, and ASME standards for brackish water desalination.
- Case Validation: Successfully deployed in industrial and municipal brackish water projects, delivering reliable water supply for production and daily use. 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 |
|---|---|---|---|---|---|
| 1st-Stage RO System (30m³/h) | – | 1 | 78,550 | 78,550 | 6 pressure vessels, 30 DOW membranes, high-pressure pump |
| 2nd-Stage RO System (12m³/h) | – | 1 | 56,750 | 56,750 | 3 pressure vessels, 15 DOW membranes, high-pressure pump |
| 3rd-Stage RO System (4m³/h) | – | 1 | 42,590 | 42,590 | Pressure vessels, 10 DOW membranes, high-pressure pump |
| Container & Auxiliaries | – | 2 | – | – | 2×40ft containers, UV sterilizers, piping, valves (included in total) |
| Total EXW Price | – | – | – | 177,890 | Includes filters, controller cabinet, spare parts, international packaging |
5.2 Terms & Conditions
| Term Type | Details |
|---|---|
| Payment Term | T/T: 50% deposit for production, 45% before shipment, 5% after installation |
| Lead Time | 40 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) |
| Consumables | 1-year consumables available at additional cost (USD56,850 for 3-year spare parts) |
| Customization | Available for capacity, pressure, or water quality requirements (price/production time varies) |
5.3 3-Year Spare Parts Quotation
| Consumable Name | Quantity | Unit Price (USD) | Total Price (USD) | Service Span |
|---|---|---|---|---|
| Precision Filter Cartridges | 1440 pc | 2.5/pc | 3,600 | 2 months |
| Scale Inhibitor | 150 pc | 55/bottle | 8,250 | – |
| 1st-Stage RO Membranes | 30 pc | 660/pc | 19,800 | 36 months |
| 2nd-Stage RO Membranes | 15 pc | 780/pc | 11,700 | 36 months |
| 3rd-Stage RO Membranes | 10 pc | 1,080/pc | 10,800 | 36 months |
| Cleaning Agent | 5 pc | 40/bottle | 200 | – |
| Electrical Components | 1 set | – | 2,500 | 36 months |
| Total | – | – | 56,850 | – |
6. Common Questions (FAQ)
6.1 Maintenance and Consumables
Q1: How often do RO membranes and filter elements need to be replaced?A1: Precision filter cartridges (2 months), RO membranes (3 years), quartz sand (36-48 months), activated carbon (12-18 months). Cycles depend on raw water quality. For replacement parts, visit [accessory supporting equipment].
Q2: What is the CIP cleaning frequency?A2: Recommended every 3-6 months under normal operation; triggered automatically by pressure difference or timed cycles.
6.2 Warranty and Support
Q1: What is covered under the 12-month warranty?A1: Manufacturing defects in equipment (pumps, membranes, pressure vessels, control system). Consumables and human-induced damages are excluded.
Q2: Can the system be expanded for higher capacity?A2: Yes. The modular design allows adding additional RO stages or parallel modules to increase total capacity.
6.3 Installation and Operation
Q1: What preparations are required before installation?A1: Prepare a flat site for 2×40ft containers, stable power supply (380V/3P/50Hz), and raw water inlet/concentrated brine discharge pipelines.
Q2: How to handle power outages?A2: The system shuts down automatically to protect equipment; manual restart is required after power restoration. Optional UPS backup is available for critical applications.
6.4 System Performance
Q1: What is the maximum raw water TDS the system can handle?A1: The 3rd stage is designed for TDS ≤35,000 ppm. For higher TDS (e.g., seawater), a dedicated seawater RO membrane upgrade is available.
Q2: How efficient is the energy recovery system?A2: The ERD reduces energy consumption by 20-30%, lowering operational costs significantly compared to systems without energy recovery.
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