Seawater desalination equipment

Containerized/skid-mounted seawater desalination equipment | Ultrafiltration + RO dual membrane method · Fully automatic operation

This equipment utilizes mature reverse osmosis (RO) technology combined with an ultrafiltration (UF) pretreatment system, specifically designed for seawater with high salinity, high turbidity, and high microbial risk. After pre-filtration and ultrafiltration precision filtration, seawater enters the high-pressure RO membrane system for desalination, ultimately producing freshwater that meets World Health Organization (WHO) standards. The entire system can be integrated into containers or skids, allowing for quick installation and easy operation. It is widely used for water supply in islands, ocean-going vessels, drilling platforms, coastal villages and towns, and emergency rescue operations.

core components

Pre-filter: Multi-media filter (quartz sand/manganese sand) or self-cleaning filter to remove silt, suspended solids, shells, and large particles from seawater.

Ultrafiltration (UF) system: Hollow fiber ultrafiltration membrane with a filtration accuracy of 0.01–0.1 microns, effectively removing colloids, bacteria, viruses, and large organic molecules, ensuring an RO membrane feed water SDI ≤ 3 and significantly extending RO membrane lifespan.

High-pressure RO reverse osmosis system: Desalination-specific RO membrane (high desalination rate, pressure resistance ≥ 800 psi), high-pressure pump (316L stainless steel), energy recovery device (optional), desalination rate up to 99.5% or higher.

Freshwater tank: PE or stainless steel, used to store produced freshwater, with automatic start/stop equipment controlled by liquid level.

Cleaning and control system: Online flushing/chemical cleaning device; PLC fully automatic control, touch screen human-machine interface, enabling one-button start/stop, parameter monitoring, and fault alarms.

Working principle

Pretreatment: Seawater passes through a pre-filter to remove large particles before entering the ultrafiltration system to remove bacteria, colloids, and finer suspended solids, ensuring the quality of the RO feed water.

High-Pressure Reverse Osmosis (RO): The pretreated seawater is pressurized by a high-pressure pump and enters the RO membrane module. Water molecules pass through the RO membrane to become freshwater, while salts, heavy metals, bacteria, etc., are retained on the concentrate side and discharged.

Production and Storage: Freshwater is disinfected and then enters the freshwater tank. The equipment automatically enters standby mode when the tank level is high and automatically starts producing water when the level is low.

Automatic Flushing: The RO membrane undergoes low-pressure flushing each time it is started or stopped, or at regular intervals, to prevent salt crystallization and biofouling.

Main advantages

High desalination rate: RO membrane desalination rate ≥99.5%, effluent TDS <500 mg/L, superior to WHO drinking water standards.

Ultrafiltration enhanced pretreatment: Compared to traditional sand filtration + security filter, ultrafiltration provides more stable SDI, extending the RO membrane cleaning cycle by 2-3 times.

Corrosion-resistant materials: High-pressure pipelines, pump body, and membrane housing are all made of duplex stainless steel, suitable for high-chlorine seawater environments.

Fully automatic operation: PLC control, unattended operation, optional remote monitoring and mobile phone alarm.

Modular design: Can be containerized or skid-mounted, convenient for transportation and installation; on-site connection only requires power, seawater, and freshwater output pipes.

Technical parameters

Water production capacity: 0.5 – 10 m³/h

Desalination rate: ≥99.5%

Effluent TDS: ≤500 mg/L

Influent water quality: Seawater TDS ≤45000 mg/L, temperature 5～45℃

Recovery rate: 30% – 45% (seawater)

Operating pressure: 55 – 70 bar (automatically adjusted according to water temperature and salinity)

Pre-filter: Multi-media or self-cleaning filter (100μm precision)

Ultrafiltration membrane: Hollow fiber, pore size 0.01～0.1μm

RO membrane: Seawater-type polyamide composite membrane

Freshwater tank: Volume customized (PE/stainless steel)

Power supply: Customized

Application areas

Centralized water supply for islands, coastal communities, and resorts; freshwater supply for ocean-going vessels, yachts, and warships; offshore drilling platforms and marine engineering bases; process water for coastal factories and power plants; water supply for humanitarian aid, and temporary bases. We can provide containerized or skid-mounted solutions based on the original seawater quality, water production volume, and installation conditions. Please send us your water quality and requirements to receive a detailed technical quote.

Company Profile

AA SS AQUA HITECH CO., LTD. was established in 2005 in Shenzhen, China. It is a leading technology enterprise specialized in the design, manufacturing, installation, commissioning and maintenance of technical solutions for high-difficulty industrial wastewater treatment projects.

Since its establishment, the company has been fully committed to the research of treatment technologies for high-difficulty and refractory industrial wastewater, wastewater recycling and reuse technologies, and wastewater zero-discharge technologies. It strives to achieve low project costs, high outputs and optimization of total social resources.

The water treatment technology solutions and achievements developed by the company have been widely applied in multiple fields of high-difficulty and refractory organic wastewater treatment, including pharmaceutical wastewater, chemical wastewater, pesticide wastewater, laboratory wastewater, coal chemical wastewater, petrochemical wastewater, breeding wastewater, slaughterhouse wastewater, semiconductor wastewater, printing and dyeing wastewater, coating wastewater, landfill leachate, food processing wastewater, mechanical processing wastewater and domestic wastewater.

Adhering to the business philosophy of leading technology, first-class quality and sustainable service, the company endeavors to provide customers with strong technical support and realize the sustainable development and utilization of water resources.

The electrochemical wastewater treatment equipment independently developed and invented by our company can achieve a removal rate of over 99% for COD and ammonia nitrogen in refractory industrial organic wastewater featuring high salinity, high toxicity, high concentration and strong acidity or alkalinity. It has solved the long-standing problem of high-difficulty and complex wastewater treatment in the industrial wastewater treatment industry, representing a significant breakthrough in the treatment scope, methods and effects of high-difficulty and complex industrial wastewater.

CQDHX SERIES EO Electrochemical Advanced Oxidation Technology

Cutting-edge Electrode Manufacturing Technology

Over a 15-year period starting from 2010, we have been dedicated exclusively to the R&D, manufacturing and application of electrodes. Having completed more than 3,000 verification tests on electrode materials and manufacturing processes, as well as over 5,000 experiments on different types of highly complex wastewater, we have tailored the compositions of electrode substrates, surface materials and the deposition conditions of electrode surfaces by integrating the characteristics of various highly complex wastewater types. This has enabled us to achieve optimal performance in treating different categories of highly complex wastewater.

The CQDHX Series Electrode Modules are capable of meeting the requirements for treating highly complex industrial wastewater under extreme conditions. They can effectively remove organic matter (COD), ammonia nitrogen, toxic substances, bacteria, chromaticity, phosphorus and various heavy metals from refractory industrial organic wastewater characterized by high salinity, high toxicity, high concentration and strong acidity or alkalinity.

Working Mechanism of CQDHX SERIES EO Electrode Modules

Electrochemical oxidation is a technology that utilizes an applied electric field to drive chemical reactions for pollutant degradation. Its core reaction occurs at the anode of the electrolytic cell, and the operating mechanisms are primarily categorized into two types: direct oxidation and indirect oxidation, which often function synergistically.

Direct Oxidation Mechanism: Pollutant molecules migrate to and adsorb onto the anode surface. Subsequently, the anode, acting as an electron acceptor, directly extracts electrons from the pollutant molecules, causing their oxidative decomposition. This process is controlled by the mass transfer rate and relies on the catalytic activity and adsorption properties of the anode material, exhibiting a certain degree of selectivity towards different pollutants.

Mechanism of Indirect Oxidation: The anode does not directly oxidize pollutants. Instead, it generates highly oxidizing agents by electrolyzing components within the solution. These agents then diffuse into the bulk solution and carry out homogeneous oxidation of the pollutants. Depending on the type of oxidants generated, the main pathways can be categorized as follows:

Electrochemical oxidation achieves pollutant degradation through two main mechanisms: electron transfer at the anode surface and the in-situ generation of highly oxidizing species. In practical applications, particularly for complex wastewater systems, direct and indirect oxidation often work synergistically. By optimizing electrode materials and process parameters, efficient and advanced treatment of organic pollutants can be achieved.

 Technical Advantages

High Salinity Tolerance: It can effectively remove COD and ammonia nitrogen from unsaturated saline wastewater with a removal rate of up to 99%.

High Toxicity Tolerance: It can effectively remove COD and ammonia nitrogen from highly biotoxic wastewater with a removal rate of up to 99%, while efficiently eliminating the biological toxicity of the wastewater.

High Concentration Tolerance: It can effectively remove COD and ammonia nitrogen from high-concentration organic industrial wastewater with a COD level of ≤ 450,000 mg/L, achieving a removal rate of up to 99%.

Strong Acid-Alkali Tolerance: It can effectively remove COD and ammonia nitrogen from strongly acidic or alkaline wastewater with a pH value ranging from 1 to 11, with a removal rate of up to 99%.

High Safety: The equipment operates at a DC voltage ranging from 3 to 15V, causing no harm to the human body.

No chemical agents are added during wastewater treatment, and no residues or solid wastes are generated.

The electrode modules operate without scaling or clogging.

The equipment achieves a removal rate of 75–100% for high ammonia nitrogen, cyanide breakdown, decolorization, and other pollutants.

No pH adjustment is required for incoming wastewater, which significantly saves on acids, alkalis, labor costs, and floor space, while avoiding secondary pollution.

No water dilution is needed to reduce the salinity of incoming wastewater, decreasing the system’s treatment load and conserving resources.

No water dilution is needed to reduce the COD concentration of incoming wastewater, decreasing the system’s treatment load and conserving resources.

The equipment features a small footprint, occupying approximately 2% of the floor space required by traditional processes of the same capacity.

The equipment has no special environmental requirements and can be installed in well-ventilated, rainproof, non-explosion-proof areas.

The equipment operates with no noise and zero discharge of secondary pollutants.

It features fully automated operation, which is simple, safe, and does not require on-site personnel monitoring.

Equipment Specifications: 0.5T–1000T/h

Electrochemical Oxidation Equipment for Treating Common Pollutants

Application Scenarios:

Treatment of Refractory and Toxic Pharmaceutical Wastewater

Treatment of Refractory and Toxic Chemical Industry Wastewater

Treatment of Refractory and Toxic Pesticide Wastewater

Treatment of Refractory and Toxic Laboratory Wastewater

Treatment of Refractory and Toxic Coal Chemical Industry Wastewater

Treatment of Refractory and Toxic Petrochemical Wastewater

Treatment of Aquaculture Wastewater

Treatment of Slaughterhouse Wastewater

Treatment of Refractory and Toxic Semiconductor Industry Wastewater

Treatment of Refractory and Toxic Dyeing Wastewater

Treatment of Refractory and Toxic Painting/Paint Coating Wastewater

Treatment of Refractory and Toxic Landfill Leachate

Treatment of Food Processing Wastewater

Treatment of Refractory Machining Wastewater

Treatment of Domestic Sewage