KEPD vs Conventional filters

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About KEPD Filters

Since 1988, KEPD fully automatic hi-rate filtration systems has been the preferred choice by customers demanding high quality water.

Media compaction, sand channeling, sand loss and media crusting are some of the common operational problems faced by conventional systems. They result in downtime, increasing repair and replacement cost and contributes to revenue losses.

No effort has been spared in the research and development phases of this product. Most of the problems faced by conventional filtration systems were studied, researched and resolved before this system was birthed.

More than 2000 units of KEPD system has commissioned in steel mills, petrol chemical companies, waste water treatment plants, recreation clubs and municipal water.

Certified GB/ISO 19001 - 2008, our systems have been consistently producing results that surpassed customer expectations and regulatory requirements.

2 sets of 5xKEPD filters

3 x conventional filters

Comparison between KEPD and conventional filtration systems

Features KEPD Filters Conventional Filters

Tank shape and dimensions

 
  1. Horizontal cylindrical tanks.
  2. Dimension(mm): Ø900 X 2000 X 1750        
  1. Usually vertical tanks.
  2. Dimension(mm) Ø3000-5000 X 3000-5000  

Installation and construction requirements
  1. Site preparation-                                                        simple 200mm concrete platform, no other construction costs.    
  2. Compact sized tanks. Onsite assembly, no heavy equipment required during installation. Piping is standard between tanks and pre-fitted.                   
  3. Overall installation is simple and fast.    
  4. Small footprint, modular configuration- allows flexibility, according to space availability.
  1. Site preparation-                                                                   requires reinforced concrete foundation.          
  2. Single large tank. Onsite fabrication, requires heavy lifting equipment for installation. Piping and valves are customised at site.          
  3. Long preparation to commissioning duration.
  4. Large footprint
Tank corrosion control
  1. Material: carbon steel
  2. Anti-corrosion treatment: Interior and exterior equipment sand blasted grade S2.5.
  3. Interior is epoxy coated. Outer surfaces sprayed with polyurethane resin paint. All processes are carried out in factory.
  1. Material: carbon steel
  2. Due to tank size, on site welding and corrosion control process is not thorough. Resulting in poor corrosion resistance.
  3. Rubberised linings are in some installations.
Valves
  1. One valve per tank
  2. Hydraulic valves
  3. Body material: copper
  1. Each tank has four valves
  2. Pneumatic or electric valves
  3. Body material: cast steel
System pipes

Branded UPVC Pipes. High durability, anti corrosion and UV resistance. Internal pipes and fittings are resistant to corrosion.

 Carbon steel welding: prone to corrosion
Working pressure and backwash water
  1. Minimum system pressure  20MPa
  2. Does not require additional backwash pumps and compressed air
  3. Backwash with filtered system water
  4. Backwash flow: 1m3/min, 3 min/tank
  5. Backwash is seamlessly carried out. Sequential and does not disrupt filtration process.
  1. Minimum system pressure 25MPa
  2. Requires backwash water pumps and compressed air
  3. Backwash with filtered water
  4. Backwash water usage is high                              
Filter media 
  1. Uses uniformly processed sand or quartz sand. Smallest sand size is 0.28mm.
  2. Specially developed water distributor and water collector, prevents sand loss, compaction, channeling problems.
  3. Does not turn into bio filter.
  4. Sand replacement not needed for several years
  1. Multi-media: sand size minimum 0.5mm.
  2. Sand loss, sand compaction, channeling phenomenon occurs.
  3. Become bio filter when biofilm begins to colonise on crusted surfaces. Organic particulates often flows through system unfiltered.
  4. Requires regular sand replacement    
Effluent quality Effluent quality: 0.1µm, 0.5NTU Effluent quality >20µm. 

Operation modes

Fully Automatic system, PLC control

Backwash options: (1) Automatic, (2) Time, or (3) Manual

  
Features
  1. Each tank has a inspection pothole, filtration process and backwash can be observed.
  2. Tank inlet, outlet and the backwash pipes are above the tank - easy to install.
  3. All tanks operate independently, they can be isolated for repairs and maintenance. Will not disrupt system operations.
  4. Inspection pothole and sand discharge outlet is in front of tank easy removal and replacement of sand media.
  1. Tank is closed, unable to view operation and backwash condition.
  2. Outlet pipe at base of the tank, when a tank needs replacing, it is necessary to empty water in adjacent tanks and pipes implement works. System must shut down.
  3. As the manhole is usually on the side, and sand discharge port below the tank. Making sand removal and replacement difficult.
Summary
  1. Fully automatic operation
  2. Simple installation and site preparation
  3. Small footprint
  4. Longer equipment life – Robust construction, high corrosion resistance
  5. Water saving, energy saving, savings on maintenance costs, resulting in lower long term operating costs
  1. May not be fully automatic
  2. Installation is complex, extensive site preparation 
  3. Large footprint
  4. Shorter equipment life – Prone to corrosion
  5. Uses more water and energy. Maintenance and repairs results in higher operation and maintenance costs. Long term operating cost in higher.