1. Home
  2. /
  3. Products
  4. /
  5. Limestone contactors in containers

Limestone contactors in containers

The DrinTec™ design of upflow limestone contactors of constant height simplifies the reload operation by means of feeding the granulated limestone continuously, under water and directly on to the limestone bed by using a limestone feeding system, thus maintaining a constant bed height all the time. It‘s a very effective system that will operate continuously for many years without needing to perform a backwash.

DrinTec™limestone Contactors of constant height in containerised horizontal tanks feature limestone feeding system, internal perimeter spillways, underdrain system for water and air and built-in calcite silo. Each unit is made according to project specific needs.

The designs allow for a guaranteed autonomy of more than 30 days and minimal wasted water if the outlet turbidity is properly controlled. This procedure has the advantage that the quality of the outlet water is always constant. Consequently, the operation and maintenance costs are reduced considerably over the traditional designs.

The limestone contactors are usually placed in parallel. Because they have the same height they offer the same counter-pressure. This facilitates the hydraulic design of the inlet manifold and provides an uniform and constant water distribution to the different tanks.

The limestone contactors operate by gravity with a low pressure drop, so they can operate directly with the outlet pressure of the reverse osmosis racks.

The turbidity is controlled using dust free material and maintaining a constant flow rate, i.e. avoiding sudden changes in flowrate. If the current flow is going to be increased, flow is initially diverted and incorporated gradually thereafter to the contactor.

There is very little need to purge the limestone contactors, as they operate upflow and do not tend to clog. However, at least once a year a 5 minutes sponging is recommended to reduce the risk of formation of preferential pathways.

Internal parts and the DrinTec™ process are protected by various patents.

Advantages of DrinTec™ limestone contactor process:

  • Designed for quick deployment
  • Equipment shipped in standard ocean container
  • Very high efficiency
  • Flexible automation: fully, partial, none
  • Constant performance and water quality
  • Low maintenance cost
  • Minimum or no energy consumption
  • No moving parts
  • More than 30 days autonomy
  • No need for qualified workforce to operate
  • No need for frequent backwash: At start up and then once a year

Technical Specs:

  20′ container 40′ container Units
Maximum treatable flow Up to 1100* Up to 2800* m³/d
Turbidity < 1 NTU**
Container weight (empty tank) ≈3000 ≈7500 kg
Container weight (full tank) ≈35000 ≈75000 kg
Maximum inlet pressure 1 bar
Outlet pressure Atmospheric  
System autonomy >30 days
“Worm Tank” dimensions 4790 x 1625 x 2000 4790 x 1625 x 2000
4790 x 1625 x 2250
(l x w x h) mm
Container type 20’ Standard 40’ High Cube  
Container internal dimensions 5900 x 2350 x 2393 12036 x 2350 x 2693 (l x w x h) mm
Design temperature 40 ºC
Required material for operation Granulated calcite & CO2  
Energy consumption Nil KWh/m³
Installation “Plug and play”  
Time between backwashing At start up and then once a year  
Backwash water 220 220 m3/h at 1 bar
Backwash air 500 500 Nm3/h at 0,7 bar

* Depends on permeate characteristics and water temperature.
** Assuming that the calcite quality is according to the recommendations in our technical brochure.

Canary Islands, Spain
+34 922 00 60 30

Drintec is a trademark of: