LEFILTER Shallow Sand Filter: Automated Pre-Treatment Powerhouse for Industrial Water Systems

Introduction  

The shallow filter is composed of several filter units arranged side by side. When the system is in the filtering state, the unfiltered water is evenly distributed through the unique water distributor developed by ourselves, and the water passes through the packing layer (refined uniform-grained quartz sand) in the filter in a laminar flow state. When the water fows through the packing layer, the impurities are intercepted stay inside the packing layer. There are multiple evenly distributed water collectors at the bottom of the filter, which collect and lead out the filtered water evenly, and advective filtration allows the filter to filter at a high flow rate and still achieve abetter filtering effect.

Features

LEFILTER Shallow Sand Filter stands out with four core advantages, addressing industry pain points like high energy consumption, unstable operation, and complex maintenance:

 ① Stable Operation: Fully Automatic Control  

- Equipped with PLC/DCS control systems, the filter automatically switches between filtration and backwashing (triggered by time or pressure difference).  

- Backwashing process: 3-5 minutes per cycle, using 2-5% of treated water, ensuring continuous system operation without shutdown.  

 ② Energy-Saving Design: Low Pressure Loss  

- The unique "shallow sand layer" structure (filter layer thickness 400–600mm, 50% thinner than deep sand filters) reduces flow resistance.  

- Pressure loss ≤0.03MPa during filtration, slashing pump energy consumption by 20–30% (verified by *China Water Treatment Industry Report, 2024*).  

 ③ Easy Maintenance: Quick Disassembly  

- Modular tank design allows single-tank maintenance without halting the entire system.  

- Compact footprint: 30% smaller installation area than traditional sand filters, suitable for space-constrained sites (e.g., urban water plants).  

 ④ Reliable Performance: Integral Molding  

- Filter tanks adopt integral molding technology (seamless welding for stainless steel; epoxy coating for carbon steel), resisting corrosion (salt spray test ≥480 hours) and preventing leakage.  

Technical Drawings

Technical Parameters

• 1.Working effect

• Influent turbidity:<30FTU, effluent turbidity:<10FTU

• 2.Working Environment Parameters

• l Working temperature: 5-60°C

• l Working pressure:≤ 0.6MPa

• l Inlet water pressure:> 0.3MPa

• l Backwash back pressure: >0.3 MPa (if≤0.3MPa, a regulating valve needs to be added to the outlet main pipe)

• l Pressuredifference between inlet andoutlet:0.02-0.05MPa

• 3. Operating parameters

• l Working method: pressure type

• l Operating method: water flow from top to bottom

• l Filtration speed:30-60m/h

• l Backwashing method: internal source backwashing

• l Backwash water consumption: 1-3%

• l Backwash intensity: 4-15L/s m2

• l Backwash duration: 10-15min

• l Backwash expansion rate: 40-50%

• 4.Control mode: manual control, automatic control (time)

• 5.Tank-material:Q235B,304,316L,carbon steel with rubber lining.Water-capmaterial:ABS,304,316L

• 6. Single flow rate:0.5m3/h~230m3/h

• 7.Input voltage: AC22OV± 10 %50-60HZ

• 8. Output voltage: AC24V/ AC220V

• 9. Load power: 24W/1A

• 10. Power of each circuit:<50w

Application Fields

1.Filtration of industrial water:such as: steel plant oxygenlance water,boiler,heat exchanger water supply, etc.,can filter out impurities in water and avoid blockage of pipelines and nozzles.

2.Filtration system for industrial circulating water. Such as cooling tower circulating water, heat exchanger circulating cooling water, dry dedusting circulating water treatment system.

3.Treatment of raw water: It can be used for the treatment of surface river water, lake water, sea water, reservoir water, well water, water plants of industrial enterprises, centralized water supply stations,etc. and the removal of iron and manganese from ground water.

4.Agricultural irrigation: especially suitable for water sources with large flow and low impurity content, such as irrigation of farmland water conservancy, irrgation of lawns on parks and golf courses, etc.

5.Foodprocessing industrial water,paper industry,electricsewagetreatment,etc. pretreatmentof industrial andmedical purewater.

Recycling of industrial production water, industrial wastewater treatment, and removal of suspended solids from production wastewater.

6.It is used for pretreatment of sewage treatment plants, pretreatment before softening and desalinationtreatment, biochemical treatment of organic sewage, and subsequent filtration after treatment in secondary sedimentation tanks.

7.Urban tap water is used as the water source to filter the differentiated water supply of urban communities to remove sand,suspended solids, algae, and organic matter in the water.

8.Purification treatment of aquatic industry, swimming pool and water park,fountain waterscape.

Q&A: Your Concerns, Answered

 Q1: What types of water can the filter treat?  

A: Suitable for raw water (rivers, lakes, wells), industrial wastewater (pre-treatment), and recycled water. Ideal for turbidity ≤30 NTU; for higher turbidity, pair with coagulation sedimentation.  

 Q2: Is backwashing automatic?  

A: Yes—triggered by pressure difference or time. The system runs unattended, with alarms for abnormal conditions (e.g., low backwash pressure).  

 Q3: Can it be customized?  

A: Yes—supports custom tank size (Φ800–Φ3000mm), material (stainless steel/carbon steel), and control mode (PLC/DCS integration).  

 Q4: How to maintain it?  

A: Replace sand media every 3–5 years; check seals and valves annually. Maintenance cost is ¥0.1–0.3/m³ of treated water.  

 Q5: How does it compare to deep sand filters?  

A: Shallow sand filters have thinner sand layers (400–600mm vs. 1–2m), lower pressure loss, and faster backwashing. Best for pre-treatment; deep filters suit higher precision needs.