Mobile Containerized SWRO for Sea Sand Washing

Product Overview

Metalsin’s Mobile Containerized SWRO for Sea Sand Washing is a modular desalination terminal specifically engineered for global construction and land reclamation projects. By integrating high-performance Reverse Osmosis (RO) technology into a standard shipping container, the system offers exceptional Mobility and Plug-and-Play functionality.

A typical mobile containerized seawater RO desalination system for sea sand washing plants, with a output capacity of 160 tons per hour. Advance DOW reverse osmosis membranes & Siemens motors.

In sea sand washing applications, raw marine sand contains high concentrations of chloride ions, which can lead to steel reinforcement corrosion if used directly in construction. Our system draws seawater on-site and converts it into high-quality industrial freshwater for sand spraying and rinsing, ensuring the final product meets international construction standards (such as BS or ASTM). The containerized design facilitates rapid relocation as the project progresses while providing a robust physical barrier against corrosive coastal salt spray.

Key Parameters and Performance Indicators

Based on industry-leading standards and technical specifications, the SWRO desalination system features the following core performance parameters:

• Desalination Rate: ≥ 99.2%, ensuring washing water maintains ultra-low chloride levels.
• Production Capacity: Available in various specifications from 50~5000 tons per day (supports multi-unit parallel expansion).
• Recovery Rate: Up to 55%-80%, maximizing seawater utilization through high-efficiency design.

Core components of SWRO system: control cabinet, piping system, dosing tanks, rinse tanks.

• Material Standards: Wetted components use SS 316L or Duplex 2507 stainless steel for extreme resistance to seawater corrosion. FRP and plastic tanks are also applied.
• Energy Efficiency: Equipped with an Energy Recovery Device (ERD) to significantly reduce overall operational costs.
• Operating Environment: working temperature of 5°C – 45°C, fully adaptable to tropical and desert coastal climates; working pressure ≤ 6.5 MPa
• Raw Water TDS: ≤ 40,000 mg/L; Output Water TDS ≤ 700 mg/L.
• Standard Containers: 20-feet or 40-feet.
• Handling Time: 35~60 days; Sea Transit Time: 35~45 days.
• Warranty: 2 years; Expected Lifespan: 15~20 years.

Process Workflow and Engineering Logic

As illustrated in the process flow chart, Metalsin‘s containerized SWRO system for sea sand washing projects first draws seawater via an intake pump and injects flocculants through a Dosing System before entering the Multi-media Filter. This stage effectively intercepts large particles and suspended solids. The water then flows into a Precision Filter for secondary deep filtration, ensuring the water quality entering the membrane modules meets strict turbidity requirements. Throughout this process, an integrated CIP (Clean-In-Place) system remains on standby for routine membrane maintenance.

The process workflow of a mobile SWRO system to provide desalinated water for sea sand washing.

In the core desalination stage, the water is pressurized by a motor-driven High-Pressure Pump and enters the RO System. To optimize energy efficiency, the system is specifically configured with an Energy Recovery Device (ERD), which recaptures residual pressure from the brine discharge. Ultimately, the seawater is physically separated into high-purity Product Water that meets sand-washing standards, while excess salts are safely expelled through the discharge line. This entire flow achieves high automation from raw seawater to industrial-grade freshwater.

Frequently Asked Questions (FAQ)

1. What is the significance of “Sea Sand Washing”?

Chloride salts in sea sand cause steel corrosion and trigger “Alkali-Aggregate Reactions,” which severely threaten the structural lifespan of buildings. By using an SWRO system for washing, chloride levels in sea sand are reduced to safe levels (typically below 0.01%). This allows cost-effective sea sand to be converted into compliant construction sand, effectively solving the scarcity of inland river sand.

2. In which countries are Metalsin’s SWRO systems widely used for sea sand washing?

Our mobile containerized systems have been extensively deployed in land reclamation and infrastructure projects in the Philippines, Indonesia, the UAE (Dubai), Saudi Arabia, Morocco, and Singapore. These regions possess abundant sea sand but lack freshwater; our equipment enables them to utilize local materials, drastically reducing logistical costs.

Mobile containerized desalination solutions for construction-grade sand.

3. What special requirements do sea sand washing projects have for SWRO systems?

Sand washing projects are often situated in harsh environments and move frequently, leading to three core requirements:

• Mobility: Equipment must be easy to install and relocate to follow the construction site.
• Corrosion Resistance: The system must withstand extreme coastal conditions, including high salinity and humidity.
• High Reliability: Washing lines often operate 24/7, so the system must have high fault tolerance and a simple CIP maintenance process to minimize downtime.

Find more details of RO desalination system for specialized industrial & EPC applications: