RO Pretreatment System (Multi-media Filtration): Pre-filter for Industrial Reverse Osmosis

RO Pretreatment System (Multi-media Filtration): Pre-filter for Industrial Reverse Osmosis

RO pretreatment system (multi-media filtration) serves as the front-line protection unit of reverse osmosis water treatment lines to intercept suspended pollutants in raw water. It can be matched with Medium-scale reverse osmosis equipment, and integrated into complete sets of 20 tons/hour reverse osmosis equipment. By removing sediment, colloid and turbidity substances, this system effectively lower membrane fouling risks, stabilize long-term running efficiency of RO main units and extend service life of core reverse osmosis membrane components.

Product Description

RO pretreatment system (multi-media filtration) is the essential front-end processing facility installed before reverse osmosis main unit. Raw water extracted from wells, rivers or reservoirs usually contains suspended silt, organic colloids and particulate impurities. Directly feeding unprocessed raw water into RO main equipment will cause rapid membrane surface blockage, frequent cleaning and irreversible performance attenuation. This multi-media pretreatment system solves such hidden risks.

Designers can configure matching processing capacity according to downstream equipment parameters. It can operate in supporting with Medium-scale reverse osmosis equipment for medium-volume production workshops, and also form a complete water purification assembly together with standard 20 tons/hour reverse osmosis equipment. The whole system mainly consists of multi-media filter tank, supporting backwash pump, automatic valve group, flow meter and pipeline assembly. Layered filter materials intercept graded particles step by step. After treated by this pretreatment system, raw water turbidity reaches qualified standard before entering security filter and reverse osmosis main frame. Widely used in industrial production water preparation, circulating water reuse and boiler feed water treatment projects, it is the basic guarantee for stable operation of all kinds of reverse osmosis systems.

Working Principle

RO pretreatment system (multi-media filtration) works based on layered depth filtration technology. Raw water flows from the top of filter tank and passes through multi-layer graded filter materials including quartz sand and anthracite. Large-size suspended sediment is trapped on the upper filter layer, while tiny colloidal particles are intercepted in lower filter layers.

Solid pollutants are gradually retained inside filter media, so that water turbidity and SDI value drop to the required range for reverse osmosis inlet water. When filter materials are saturated by intercepted contaminants, the system starts automatic backwashing. Clean water flows reversely from bottom to top to stir filter layers and flush trapped sludge out of the tank. After backwash completes, filtration mode restarts automatically. Stable outlet water quality provides reliable protection for downstream reverse osmosis membrane elements, no matter matched with Medium-scale reverse osmosis equipment or 20 tons/hour reverse osmosis equipment.

Technical Features

1. Graded depth layered filtration: 

Different filter media capture pollutants of various particle sizes, achieving excellent turbidity and SDI reduction effect.

2. Automatic backwash control option: 

Equipped with automatic valve assembly, realize unattended periodic backwashing without frequent manual operation.

3. Flexible capacity matching: 

Customized flow rate to match downstream units, compatible with Medium-scale reverse osmosis equipment and 20 tons/hour reverse osmosis equipment.

4. Long service cycle of filter media: 

Stable filter materials resist acid and mild oxidation, only need supplement instead of frequent full replacement.

5. Compact tank layout: 

Small floor space, easy to be arranged in fixed workshops and containerized water treatment stations.

Product Advantages

1. Effectively protect RO membrane elements: 

Reduce particulate pollution load of reverse osmosis main unit, extend membrane service life and cut chemical cleaning frequency.

2. Low daily operation expenditure: 

Only consume a small amount of water during backwashing, no continuous chemical dosing required in standard working conditions.

3. Strong raw water adaptability: 

Suitable for river water, reservoir water and well water with high suspended sediment content.

4. Good compatibility with different RO units: 

Can form complete water treatment lines together with Medium-scale reverse osmosis equipment and 20 tons/hour reverse osmosis equipment.

5. Simple maintenance work: 

The internal filter material can be inspected and supplemented conveniently, without complex professional operation.

Application Fields

1. Food and beverage production workshops: 

Pretreat raw water before industrial pure water reverse osmosis systems.

2. Chemical factory circulating water reuse projects: 

Remove suspended impurities to stabilize operation of RO reuse equipment.

3. Heating station boiler feed water treatment: 

Cooperate with reverse osmosis units to produce qualified boiler makeup water.

4. Medium-sized manufacturing water purification projects: 

Support Medium-scale reverse osmosis equipment to realize continuous water purification.

5. Standardized industrial water treatment projects: 

Form complete set with 20 tons/hour reverse osmosis equipment for factory water supply expansion.

6. Containerized mobile water treatment projects: 

Installed inside containers as the first-stage pretreatment of mobile RO systems.

FAQs

Q1: What core function does RO pretreatment system (multi-media filtration) undertake in the whole water treatment flow?

A1: It removes suspended sediment and colloids in raw water, lower inlet water SDI and turbidity, prevent particulate fouling on reverse osmosis membrane surfaces and protect downstream RO main equipment.

Q2: Can this multi-media pretreatment system match 20 ton/hour reverse osmosis main equipment?

A2: Yes. We can customize corresponding processing capacity, and form a complete purification assembly matched with standard 20 tons/hour reverse osmosis equipment.

Q3: What raw water sources are suitable for multi-media filtration pretreatment?

A3: It is ideal for well water, river water and reservoir water with high suspended solids. If raw water contains massive algae and heavy organic matter, activated carbon filter needs to be added subsequently.

Q4: How often should backwashing be carried out for multi-media filter tank?

A4: The cycle depends on raw water turbidity. Normally automatic backwash is set every 6–24 hours. Users can adjust parameters on control panel according to on-site actual water quality.

Q5: Is multi-media filtration necessary before medium-scale reverse osmosis equipment?

A5: If raw water contains visible sediment and high turbidity, multi-media pretreatment is strongly recommended. It greatly reduces the failure risk of Medium-scale reverse osmosis equipment membrane elements.

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