Continuous sand filters Dynasand series

 

 

 

 

DynaSand

DynaSand™ is a world-leading continuous sand filter developed by the Axel Johnson Institute in Sweden in the late 1970s. DynaSand is used to clean and produce water for drinking, industrial processes, waste water recycling and waste water treatment before the water is discharged into a recipient. With thousands of filters installed worldwide for municipal and industrial use, we have the experience and equipment necessary to exceed your expectations.

Continuous improvement

The range of DynaSand filters is under constant development and includes the latest developments of sand filters, such as material that is extremely resistant to the abrasions caused by sand that is in constant motion during normal operation. The advanced materials mean less maintenance and prolong equipment life. Additionally, you can optimize the sand cleaning rate (the sand/water ratio) with the help of two adjustable weirs with a specially designed wash box, which minimizes losses when backwashing.

 

 

 

 

 

 

Uninterrupted operation

Uninterrupted operation provides several benefits over conventional backwashing sand filters. In conventional sand filters particles are collected in the sand bed with increasing pressure drop as a result, until finally the sand must be cleaned by backwashing before treatment can proceed. The time between backwashes can be very short, which reduces the effective operating time. It was not until the continuous sand filter technology of DynaSand was developed that it was possible to get an optimal solution to the need for continuous water and waste water treatment process while delivering a constant quality of the filtrate even at a high surface load.

Strengths

DynaSand improves the process

• No first filtrate – always high-quality clean filtrate
• Simple treatment of wash water, no shock loads
• Handles high levels of suspended particles without requiring pre-treatment
• Low pressure drop
• Low energy consumption
• Low monitoring and maintenance costs
• No need to stop for backwashing
• Small footprint

DynaSand simplifies the system

• No need for backwashing pumps
• No tank for rinsing water
• No collection tanks for rinsing water
• No need of automatic valves for backwashing
• No blowers for purge air
• No nozzles with risk of clogging the filters
• Only one filter medium
• System is simple to construct and maintain
• Simple expansion for biological treatment

Examples of industrial applications

• Metalworking
• Wash water recycling
• Process water
• Side stream filtration of cooling water
• Scale residues
• Chemical processes
• Ideal as pre-treatment instead of gravity filters

Standalone filter

If you select a standalone DynaSand filter you get a device consisting of a cylindrical tank with a conical bottom and internal filter elements. The filter has flanged connections for inlet, filtrate and wash water. The filter system can consist of one or more filters depending on the desired capacity. If you select multiple filters they are connected to the pipework that distributes the incoming water and drains off filtrate and washing water.

Standalone filters are available in 3m2, 5m2 and 7m2 sizes.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Concrete installation

If you want a facility with high capacity it usually takes the form of filter modules mounted in concrete tanks. The filter cells (each consisting of several filter modules) contain bottom cones in stainless steel or FRP and internal filter sections and have a common sand bed. Your facility can be designed for a virtually unlimited filter area allowing DynaSand to be used in both small and large facilities with very different capacities. Concrete tank installations are usually designed with 4, 6, 8, 16,32, etc. filter modules. Each filter module has an area of 5 or 6m2.