Sand Filter Carbon Filter Belt Water Softening Fully Automatic Reverse Osmosis Water Purification Equipment

Product description

This device is a fully automatic water purification system that integrates pre-treatment, softening, and deep desalination functions. Through multi-level process synergy, it treats high hardness and impurity containing raw water (such as groundwater and industrial water) into low hardness and low salt content pure water, which is widely used in industrial production, commercial water supply, and high-end civilian scenarios. The following provides a detailed explanation from three aspects: system composition, working principle, and core advantages:

1、 Core components and functions of the system
1. Sand Filter
Construction: 304/316L stainless steel tank body (or fiberglass, depending on water quality), filled with gradient quartz sand filter material (upper layer 0.8-1.2mm coarse sand, lower layer 0.5-0.8mm fine sand), equipped with fully automatic backwash valve group.
Core functions:
Physical interception: Remove large suspended particles such as sediment, rust, and algae (particle size ≥ 20 μ m) from raw water, reducing turbidity from 20NTU to ≤ 5NTU;
Protect subsequent equipment: avoid scratching activated carbon, softening resin or reverse osmosis membrane with hard particles, and extend the life of core components;
Fully automatic backwashing: When the inlet and outlet water pressure difference is greater than 0.05MPa or timed for 12 hours, automatic backwashing (water flushing+air flushing optional) is started to restore the filtering ability of the filter material.
2. Carbon Filter
Construction: Same material tank body, filled with high iodine value coconut shell activated carbon (specific surface area ≥ 1000m ²/g), and operated in conjunction with a sand filter.
Core functions:
Adsorption purification: removes residual chlorine (removal rate>99%), organic matter (such as pesticides, humic acid), odors, and pigments from water, avoiding oxidation and damage to the reverse osmosis membrane by residual chlorine;
Improving water quality characteristics: reducing chemical oxygen demand (COD) to provide more stable inlet conditions for subsequent softening and reverse osmosis treatment.
3. Belt Water Softening
Construction: Continuous operation of ion exchange resin filter belt (sodium cation exchange resin), saltwater regeneration tank (8-10% NaCl solution), drive motor and PLC control module, all stainless steel frame.
Core functions:
Deep de hardening: By exchanging ions of calcium (Ca ² ⁺) and magnesium (Mg ² ⁺) with resin and water (reaction equation: Ca ² ⁺+2NaR → CaR ₂+2Na ⁺), the water hardness is reduced from 500mg/L (calculated as CaCO3) to ≤ 5mg/L;
Continuous operation: The filter belt circulates through the “softening zone” (working) and “regeneration zone” (saltwater flushing to restore activity), without the need for shutdown for regeneration, with stable treatment efficiency (water hardness fluctuation ≤ ± 1mg/L);
Scale prevention protection: Thoroughly remove calcium and magnesium ions to avoid subsequent fouling on the surface of the reverse osmosis membrane (scale can reduce membrane flux by more than 30%), and extend the membrane cleaning cycle to 12-18 months.

4. Fully automatic reverse osmosis system (Reverse Osmosis)
Core components:
Precision filter (5 μ m PP filter element, intercepting fine impurities such as resin fragments);
High pressure pump (made of 316L stainless steel material, providing 1.0-1.5MPa pressure, with variable frequency control for 30% energy saving);
Reverse osmosis membrane module (roll type composite membrane, such as Dow BW30-400FR, desalination rate ≥ 99.5%);
Fully automatic valve group (regulating concentrated water discharge, with a recovery rate of 60% -75%);
Conductivity online monitoring device (automatic discharge of water exceeding the standard).
Core functions:
Deep desalination: intercepting more than 99% of soluble salts (such as NaCl), heavy metals (Pb ² ⁺, Cr ⁶⁺), bacteria, and macromolecular organic matter, with a water conductivity of ≤ 50 μ S/cm;
Fully automatic operation: automatically flushes the membrane surface upon startup, starts and stops based on the pure water tank level, and automatically alarms for faults (such as high pressure overload and water shortage) without the need for manual intervention.
5. Control system and auxiliary equipment
PLC intelligent control: The touch screen displays real-time parameters such as water production, hardness, and conductivity, and automatically links processes such as sand filter backwashing, belt softening regeneration, and reverse osmosis flushing.
Pure water tank: made of 304 stainless steel material, equipped with a liquid level sensor (linked reverse osmosis start stop) and a breathing filter (anti pollution).
2、 System workflow
Pre treatment purification:
The raw water first enters the sand filter to remove large particle impurities, and then passes through the carbon filter to adsorb residual chlorine and organic matter, providing qualified influent for subsequent treatment.
Softening and hardening:
The pre treated water enters a belt softener to continuously remove calcium and magnesium ions, reduce hardness to ≤ 5mg/L, and prevent scaling.
Precision protection:
Softened water is filtered through a 5 μ m precision filter to retain residual fine particles and protect the reverse osmosis membrane.
Reverse osmosis desalination:
After being pressurized by the high-pressure pump, water passes through the reverse osmosis membrane, pure water enters the pure water tank, and concentrated water is discharged; The system automatically monitors water quality to ensure compliance.
Fully automatic control:
The PLC system automatically completes backwashing, regeneration, flushing and other operations based on sensor signals, achieving 24-hour unmanned operation.

3、 Core advantages and applicable scenarios
Core advantages
Full process purification: from impurity removal, deodorization, de hardening to desalination, in one step, the water quality is stable (hardness ≤ 0.5mg/L, conductivity ≤ 50 μ S/cm);
Efficient and energy-saving: The belt softening salt consumption is 20% lower than traditional resin tanks, and the reverse osmosis variable frequency pump reduces energy consumption. The comprehensive operating cost is 15% -20% lower than similar equipment;
Long life operation: Pre treatment provides sufficient protection for the reverse osmosis membrane, extending its lifespan to 3-5 years (compared to 2-3 years in traditional systems);
Easy to operate: fully automatic control+touch screen operation, operation and maintenance personnel only need to inspect once a week, reducing management difficulty.
Applicable scenarios
Industrial water: boiler feedwater (with no hardness and low salt content), electronic component cleaning, cosmetics production (to avoid salt affecting product stability);
Commercial water supply: direct drinking water systems in hotels and hospitals (with better taste and no scale), swimming pool replenishment (low hardness to avoid pool wall scaling);
High hardness water source treatment: Northern groundwater (hardness often reaches 300-800mg/L), industrial circulating water (requiring deep softening and desalination for reuse).
summarize
This device uses a golden combination of “sand filtration+carbon filtration+belt softening+reverse osmosis” to solve the purification problem of high hardness and high pollution water sources, especially in the processes of de hardening and desalination. The fully automatic control system ensures stable operation, and the long-life design reduces overall costs, making it an ideal choice for industrial and commercial scenarios with high water quality requirements.