Fully Automatic Sand Filter Carbon Filter Belt Softening Explosion-proof Reverse Osmosis Belt Book Box Water Treatment System

Product description

System Overview
The fully automatic sand filter and carbon filter with softening function explosion-proof reverse osmosis water treatment system with water tank is a comprehensive water treatment equipment suitable for places with high water quality requirements and explosion-proof needs. This system integrates multiple advanced water treatment technologies, which can effectively remove various impurities, salts, and microorganisms in water, and produce purified water that meets specific standards.
System components and working principle
Automatic Sand Filter
Function: By using quartz sand filter material, suspended solids, sediment, rust, colloids and other large particle impurities in raw water are removed through physical processes such as interception and precipitation, reducing water turbidity.
Working principle: Raw water enters from the upper part of the sand filter and flows through the quartz sand filter layer from top to bottom. Impurities are trapped in the filter layer, and purified water flows out from the lower part. When the filter layer intercepts impurities and the pressure difference between the inlet and outlet reaches the set value (such as 0.05-0.1MPa) or the operating time reaches the set duration (such as 8-12 hours), the system automatically performs backwashing. During backwashing, the water flows in the opposite direction through the filter layer, causing the filter material to loosen and washing away the trapped impurities, restoring the filtering performance.
Parameters: The quartz sand particle size is generally 0.5-1.2mm, the filter layer thickness is 1-1.5m, and the filtration flow rate is 5-10m/h.
Automatic Carbon Filter
Function: Using activated carbon as an adsorbent, it mainly removes residual chlorine, organic matter (such as phenols, pesticide residues, etc.), pigments, odors, etc. from water, protecting subsequent reverse osmosis membrane components from residual chlorine oxidation damage.
Working principle: Water enters from the upper part of the carbon filter and comes into full contact with activated carbon. The large specific surface area and rich pore structure of activated carbon enable it to adsorb various substances in water. When the adsorption capacity of activated carbon approaches saturation, it needs to be replaced or regenerated. For partially regenerable activated carbon, its adsorption performance can be restored through chemical agents or thermal regeneration.
Parameters: Activated carbon specific surface area ≥ 1000m ²/g, contact time 10-15 minutes, residual chlorine removal rate generally greater than 99%.

Softening Unit
Function: Remove calcium (Ca ² ⁺) and magnesium (Mg ² ⁺) ions from water through ion exchange resin, reduce water hardness, prevent surface scaling of reverse osmosis membranes, and extend membrane service life.
Working principle: Using ion exchange principle, sodium type strong acidic cation exchange resin (R-Na) is usually used. Calcium and magnesium ions (Ca ² ⁺, Mg ² ⁺) in water undergo exchange reaction with sodium ions (Na ⁺) on the resin, causing calcium and magnesium ions to be adsorbed on the resin, while sodium ions enter the water, thereby reducing the hardness of the water. When the resin adsorbs calcium and magnesium ions to saturation, it needs to be regenerated with sodium chloride (NaCl) solution to restore the resin’s exchange capacity.
Parameters: The resin exchange capacity is generally 1.8-2.0 mol/L, the regenerated salt consumption is 80-100 g/L resin, and the hardness removal rate can reach over 95%.
Explosion proof Reverse Osmosis Unit
Function: Under pressure, water is passed through a reverse osmosis membrane to intercept dissolved salts, bacteria, viruses, small molecule organic matter, and other impurities in the water, producing high-purity purified water. This is a key step in achieving deep desalination in the system.
Working principle: The pore size of the reverse osmosis membrane is very small (about 0.0001 μ m), allowing only water molecules to pass through while other ions, molecules, and particles are intercepted. The high-pressure pump pressurizes the raw water to 0.8-1.5MPa, and the raw water is driven by pressure through a reverse osmosis membrane. Water molecules pass through the membrane to become produced water, while concentrated salts, impurities, etc. are discharged as concentrated water. To prevent membrane fouling and scaling, the system is usually equipped with an automatic flushing function to flush the membrane before and after startup and shutdown.
Parameters: The desalination rate of reverse osmosis membrane is generally ≥ 95%, the recovery rate is 60-80%, and the conductivity of the produced water can be as low as 5-50 μ S/cm (depending on the quality of the raw water). The device adopts explosion-proof design and is suitable for flammable and explosive environments, such as petrochemicals, coal mines, etc. The explosion-proof level meets relevant standards (such as Ex d IIC T6).
Book Box – like Water Tank
Function: Used to store purified water after processing, playing a buffering and regulating role in water volume, ensuring the stability and continuity of water supply.
Design features: The water tank can be made of stainless steel material (such as 304 or 316L), which has the characteristics of corrosion resistance and easy cleaning. An internal liquid level control system can be set up, which automatically starts the water treatment system to produce water when the water level reaches a low level; When the water level reaches a high level, the system automatically stops running. In addition, the water tank can be equipped with air respirators, cleaning devices, etc. to prevent secondary pollution and ensure stable water quality.

Application scenarios
Industrial sector
Petrochemical industry: In the process of petroleum refining and chemical production, it is used for the preparation of process water and circulating cooling water to prevent equipment scaling and corrosion, meet explosion-proof requirements, and ensure safe and stable production operation.
Coal mining industry: providing purification treatment for equipment cooling, firefighting, and domestic water in coal mines. In flammable and explosive coal mining environments, explosion-proof reverse osmosis devices can ensure the safe operation of equipment.
Electronics industry: used for processes such as electronic chip manufacturing and circuit board cleaning, providing high-purity production water to meet the high water quality requirements of the electronics industry.
Special places
Flammable and explosive hazardous areas: such as gas stations, oil depots, natural gas stations, etc. The system can purify domestic water and equipment cooling water within the station while meeting explosion-proof requirements.
Offshore platform: processes the water quality after desalination, meets the domestic and equipment water needs of offshore platform personnel, and adapts to the complex and dangerous environment at sea.
System advantages
Highly automated: The system adopts PLC or other advanced control systems, which can achieve fully automatic operation, automatically monitor water quality, pressure, flow and other parameters, automatically control the backwashing of sand filters and carbon filters, the regeneration of softening devices, and the start stop and flushing of reverse osmosis devices, reducing manual intervention, labor intensity and the risk of operational errors.
Water quality assurance: Through multi-stage filtration and deep desalination treatment, various impurities and pollutants in water can be effectively removed, producing purified water with stable water quality and meeting high standards, meeting the strict requirements of different industries for water quality.
Explosion proof safety: The explosion-proof reverse osmosis device and related electrical equipment adopt explosion-proof design, comply with explosion-proof standards, and can operate safely and reliably in flammable and explosive environments, ensuring the safety of personnel and equipment.
Stable and reliable: Each component is made of high-quality materials and mature technology, which have been rigorously tested and verified to have good corrosion resistance, pollution resistance, and long service life, ensuring long-term stable operation of the system.
Flexible configuration: The system configuration can be flexibly adjusted according to factors such as raw water quality, water production requirements, and usage scenarios, such as adding pre-treatment steps, adjusting the number and specifications of reverse osmosis membranes, etc., to meet the personalized needs of different users.
Maintenance and Precautions
Regular maintenance
Sand filter and carbon filter: Regularly check the loss of filter material, usually every six months to one year. When the loss of filter material exceeds 10-20%, it needs to be replenished or replaced in a timely manner. At the same time, regularly check whether the backwash system is operating properly to ensure effective cleaning of the filter layer.
Softening device: Regularly check the exchange capacity of the resin, generally conducting a comprehensive test every 1-2 years. When the resin exchange capacity drops to 70-80% of the initial value, it is necessary to consider regenerating or replacing the resin. In addition, it is necessary to ensure the quality and concentration of the regenerated salt solution, regularly clean the salt tank, and prevent impurities from blocking the pipeline inside the salt tank.

Reverse osmosis device: Regularly perform chemical cleaning on the reverse osmosis membrane. Depending on the quality of the raw water and the operation of the system, the cleaning cycle is generally 3-12 months. When the water production of the membrane decreases by 10-20%, the desalination rate decreases by 5-10%, or the inlet and outlet pressure difference increases by 15-20%, timely cleaning should be carried out. At the same time, regularly check the operation status of high-pressure pumps, valves, instruments and other equipment to ensure the normal operation of the system.
Water tank: Regularly clean and disinfect the water tank, usually once every quarter to six months. When cleaning, first drain the water in the water tank, then rinse the inner wall with clean water, and if necessary, use a special disinfectant for disinfection treatment. At the same time, regularly check whether the liquid level control system of the water tank, air respirator and other components are working properly.
precautions
Raw water quality requirements: The system has certain requirements for the quality of raw water. Before use, the raw water needs to be tested and analyzed to ensure that it meets the inlet requirements of the system. If the turbidity, residual chlorine, hardness and other indicators of the raw water are too high, appropriate pretreatment is needed to protect the system equipment and extend its service life.
Explosion proof area use: When using this system in flammable and explosive environments, it must be installed, debugged, and maintained strictly in accordance with explosion-proof standards and operating procedures. All explosion-proof equipment and electrical circuits must comply with the corresponding explosion-proof level requirements to prevent explosion accidents.
Water quality monitoring: Regularly monitor the water quality of the system’s incoming, produced, and concentrated water, and establish water quality records. By analyzing water quality data, problems in system operation can be identified in a timely manner, and operating parameters can be adjusted or corresponding maintenance measures taken to ensure stable and compliant water quality of the produced water.