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

Product description

This device is an integrated deep water purification system designed through the entire process of “pretreatment and impurity removal → adsorption purification → softening and hardness removal → reverse osmosis desalination”, targeting complex water sources with high turbidity, high hardness, and pollutants (such as groundwater and industrial water) for deep purification. It is widely used in industrial production, commercial centralized water supply, and high-end civilian scenarios. The following provides a detailed explanation of the system composition, working principle, core advantages, and application scenarios:
1、 Core components and functions of the system
1. Sand Filter
Construction: 304/316L stainless steel or fiberglass tank body (selected according to the corrosiveness of water quality), filled with gradient quartz sand filter material (upper layer 1-2mm coarse sand, lower layer 0.5-1mm fine sand), equipped with fully automatic backwash valve group (pneumatic or electric control).
Core functions:
Physical interception: intercepting suspended impurities such as sediment, rust, algae, and colloidal particles in water through the pores of filter media, reducing the turbidity of raw water from 20-50NTU to below 1NTU;
Pre treatment protection: prevent large particle impurities from scratching subsequent activated carbon, softened resin or reverse osmosis membrane, and extend the service life of core components;
Fully automatic backwashing: When the inlet and outlet water pressure difference is greater than 0.05MPa or timed (8-12 hours), automatic backwashing (water flushing+air flushing optional) is initiated to remove pollutants from the surface of the filter material through reverse water flow and restore filtration capacity.
2. Carbon Filter
Construction: Same material tank body, filled with high iodine value coconut shell granular activated carbon (specific surface area ≥ 1000m ²/g, iodine adsorption value ≥ 1000mg/g), and some scenes are equipped with columnar activated carbon to enhance durability.
Core functions:
Adsorption purification: Through the porous structure of activated carbon, it efficiently adsorbs residual chlorine (disinfection residue in tap water, removal rate>99%), organic matter (such as pesticides, humic acid, industrial solvents), odors, and pigments in water;
Membrane protection: Reduce the residual chlorine concentration in the influent to ≤ 0.05mg/L to avoid oxidative damage to subsequent reverse osmosis membranes (polyamide membranes are sensitive to chlorine, and excessive residual chlorine can cause membrane performance degradation);
Improving water quality stability: reducing chemical oxygen demand (COD) in water and minimizing the risk of organic pollution in reverse osmosis membranes.
3. Belt Water Softening
Construction: Continuous operation of ion exchange resin filter belt (sodium type cation exchange resin, such as 001 × 7), regeneration liquid tank (8-10% NaCl solution), drive motor (stepless speed regulation) and PLC control module, with a frame made of all stainless steel material.

Core functions:
Deep de hardening: Through the exchange reaction between resin and calcium (Ca ² ⁺) and magnesium (Mg ² ⁺) ions in water (Ca ² ⁺+2NaR → CaR ₂+2Na ⁺), the water hardness is reduced from 500mg/L (calculated as CaCO 3) to ≤ 5mg/L;
Continuous operation: The filter belt circulates through the “softening working zone” (adsorbing calcium and magnesium ions) and the “regeneration zone” (flushing with salt water to restore resin activity) without stopping the machine for regeneration. The processing capacity can reach 5-500m ³/h, and the hardness fluctuation of the produced water is ≤± 1mg/L;
Scale prevention protection: Thoroughly remove hardness ions to prevent the formation of calcium carbonate and calcium sulfate scale on the surface of the reverse osmosis membrane in the future (scale can reduce membrane flux by more than 30% and shorten the cleaning cycle to 3-6 months), extending membrane life to 3-5 years.
4. Fully automatic reverse osmosis system (RO)
Core components:
Precision filter: 304 stainless steel shell, built-in 5 μ m PP melt blown filter element (3-5 pieces, configured according to flow rate), intercepting fine particles such as resin fragments that fall off during the softening process, ensuring that the water pollution index (SDI) entering the RO membrane is ≤ 5;
High pressure pump: 316L stainless steel multi-stage centrifugal pump, providing an operating pressure of 1.0-1.5MPa (adjusted according to the TDS of the raw water), equipped with a variable frequency controller (adjusting the speed according to the water production demand, saving more than 30% energy);
Reverse osmosis membrane module: fiberglass or stainless steel membrane shell, equipped with a rolled composite reverse osmosis membrane (such as Dow BW30-400FR, Heidelberg ESPA2), single membrane desalination rate ≥ 99.5%, membrane element arrangement is “series+parallel” (designed according to water production rate);
Fully automatic valve group: including water production valve, concentrated water valve, flushing valve, etc., controlled by PLC to adjust the concentrated water discharge ratio, the system recovery rate is stable at 60% -75% (adjusted according to water quality);
Online monitoring instruments: conductivity meter (real-time monitoring of water purity, automatic discharge when exceeding standards), pressure transmitter (monitoring pressure in each section to determine membrane fouling status), flow meter (recording water production and concentration).
Core functions:
Deep desalination: Under high pressure, water molecules pass through the semi permeable membrane structure of the reverse osmosis membrane, while more than 99% of soluble salts (such as NaCl), heavy metals (Pb ² ⁺, Cr ⁶ ⁺), bacteria, viruses, and large organic molecules are intercepted, resulting in a water production conductivity of ≤ 50 μ S/cm;
Fully automatic operation: automatic low-pressure flushing of membrane surface upon startup (1-2 minutes to remove residual pollutants), automatic start stop based on pure water tank level, triggering chemical cleaning program in case of membrane fouling, automatic alarm and shutdown protection for faults (such as high pressure overload, water shortage).

5. Control system and auxiliary equipment
PLC intelligent control system: equipped with a 10-15 inch touch screen, real-time display of system operating parameters (pressure, flow rate, conductivity, water production, etc.), can set parameters such as backwash cycle and regeneration frequency, supports historical data query and fault diagnosis, and some models can be connected to the Internet of Things for remote monitoring;
Pure water tank: made of 304 stainless steel material (with a capacity of 1-2 hours of system water production), equipped with a liquid level sensor (linked reverse osmosis system start stop), a breathing filter (0.22 μ m sterilization level to prevent microbial contamination in the air), and a stirrer (to avoid water quality stratification);
Pipeline and valve: The water contact part adopts 304 stainless steel pipeline (polished inner wall), and the valve is a sanitary diaphragm valve or ball valve to ensure that the water quality is free of secondary pollution.
2、 System workflow
Pre treatment and purification: Raw water (such as groundwater and tap water) first enters a sand filter to remove suspended impurities and colloids; The effluent enters the carbon filter to adsorb residual chlorine, organic matter, and odors, completing water quality pretreatment.
Softening and Dehydration: Pre treated water enters a belt softener to continuously remove calcium and magnesium ions, reducing water hardness to ≤ 5mg/L to prevent subsequent scaling.
Precision filtration: Softened water is filtered through a 5 μ m precision filter to retain residual fine particles and provide qualified inlet water for the reverse osmosis membrane.
Reverse osmosis desalination: The high-pressure pump pressurizes the water to 1.0-1.5MPa and sends it into the reverse osmosis membrane module. Pure water passes through the membrane and enters the pure water tank, while concentrated water (containing high concentration impurities) is discharged after being regulated by a valve.
Intelligent monitoring and maintenance: The PLC system collects real-time parameters of each link, automatically completes maintenance operations such as sand filter backwash, belt softener regeneration, reverse osmosis membrane flushing, etc., to ensure stable operation of the system.
3、 Core advantages and application scenarios
Core advantages
Full process deep purification: from impurity removal, deodorization, de hardening to desalination, one-step treatment of complex water sources, stable water quality (hardness ≤ 0.5mg/L, conductivity ≤ 50 μ S/cm), meeting the needs of multiple scenarios;
Efficient and energy-saving: The salt consumption of the belt softener is reduced by 20% -30% compared to traditional fixed bed resin tanks, and the energy consumption of the variable frequency high-pressure pump in the reverse osmosis system is reduced by 15% -20% compared to the power frequency pump. The comprehensive operating cost is significantly lower than that of similar equipment;
Long life operation: Multi stage pretreatment fully protects the reverse osmosis membrane, and the membrane cleaning cycle is extended to 12-18 months. The membrane life is extended by more than 50% compared to traditional systems (without softening or simple pretreatment);
Unmanned operation: Fully automated control reduces manual intervention, and operation and maintenance personnel only need to conduct regular inspections (supplement regenerated salt, replace filter elements), reducing management costs.
Typical application scenarios
Industrial water: boiler feedwater (requiring low hardness and low salt content to prevent scaling and corrosion), electronic component cleaning (avoiding salt induced short circuits), cosmetics production (preventing hardness ions from affecting product stability);
Commercial water supply: direct drinking water systems in hotels and hospitals (with excellent water quality and no scale), swimming pool replenishment (low hardness to avoid pool wall scaling and water turbidity);

High hardness water source treatment: Northern high hardness groundwater (hardness often reaches 300-800mg/L), industrial circulating water (requiring deep softening and desalination for reuse), food processing water (removing impurities and hardness, meeting hygiene standards).

summarize
This device solves the core problems of “high turbidity, high pollutant content, high hardness, and high salt content” in complex water sources through a collaborative process of “sand filtration+carbon filtration+belt softening+reverse osmosis”. It combines purification depth, operational stability, and economy. Its fully automatic control design makes it suitable for water use scenarios of various scales, making it an ideal solution for high demand water purification in industrial and commercial fields.