Primary Settlement Tanks


WPL Primary Settlement Tanks also known as clarifiers can be used in conjunction with WPL treatment products or to complement existing process units for wastewater treatment in commercial and municipal applications.

Primary Settlement tank options:

  • WPL Conical Settlement Tank
  • WPL Cylindrical Settlement Tank
  • WPL Lamella Plate Settlement Tank
  • WPL Rectangular Settlement Tank

Bundled solution for 3 DWR CYMRU Welsh Water sites – read more

WPL-conical-tank-installation at three welsh-water-sites

WPL Conical Primary Settlement Tank

WPL Conical Settlement Tanks are high quality sedimentation tanks used in the primary stage of the wastewater treatment process. Manufactured in glass reinforced plastic (GRP), the settlement units are custom made to meet your treatment needs.

WPL Conical Settlement Tanks are supplied complete with internal launders, diffuser drum (stilling well), scum board and piping.

Designed to principles established in BS 4994.


Features and Benefits of the Conical Primary Settlement Tank:

  • Corrosion-resistant
    Quality material constructed with corrosion-resistant GRP
    Tanks can also be made to withstand very strong alkalis or acidic PH levels
    Increased retention period
    Option for extending sidewall to increase retention period
  •  Quality design
    60 degree inverted cone design is the optimum angle to encourage settlement of solid particles
  •  Adaptable
    Can be installed either above ground 3m diameter or below ground to 6m diameter
    Options are available for up-flow/cross-flow systems and scum draw-off systems
    Connection sizes and positions tailored to customer needs


Indicative drawing of a WPL Conical Tank*

Image of a WPL conical tank indicative drawing for primary and final settlement for sewage and wastewater treatment

* Tank volumes can be increased by extending the side wall height


WPL Conical Tank Specification Information

Image of a WPL conical tank specification information table


WPL Cylindrical Primary Settlement Tank

Designed in accordance with the latest European Legislation, WPL Cylindrical Settlement Tanks are high quality sedimentation tanks used in the primary stage of the wastewater treatment process. Manufactured in GRP, they are light and easy to handle for installation. They are also not susceptible to rust, exhibit excellent corrosion resistant properties.


Features and Benefits of the Cylindrical Primary Settlement Tank:

  • Flexible installation depths
    Variable inlet depths giving it complete flexibility for different site conditions and installation requirements
  •  Robust design
    Heavy and extra heavy duty tanks available
  •  Easy access for emptying
    Bauer coupling connections available as an option for ease of emptying


WPL Lamella Plate Primary Settlement Tank

WPL Lamella Plate Settlement Tanks are the ideal solution where there is no existing primary or final settlement on site and where space is at a premium. Used in conjunction with our biological treatment modules, the units can be designed to provide a high effluent quality.

We can design a bespoke settlement tank for your specific application. Standard size modules can be fitted with ladder / staircase and handrails and desludge pipe work can be adapted to suit specific site requirements.

WPL Lamella Plate Settlement Tank can be hired and/or purchased for permanent or temporary installations.


Features and Benefits of the Lamella Plate Primary Settlement Tank:

  • Compact design
    Requires only a small footprint for ease of installation and delivery
  •  High effluent quality
    Can be designed to meet specific quality requirements for individual sites


WPL Rectangular Primary Settlement Tank

Designed for below ground applications, rectangular settlement tanks are used for primary or final settlement generally as part of a modular package, but can be sold separately. Bespoke solutions are available with flows of up to 6 litres per second.


Features and Benefits of the Rectangular Primary Settlement Tank:

  • Quality design
    Designed with a conical end to encourage efficient settlement
    Large cross sectional area designed to 0.7m/hr upflow velocity
    Incorporates the WPL forward feed airlift which can also be used for primary or humus sludge removal
  •  Easy access
    Excellent access for emptying by suction tanker
    Variable lid designs, Bauer connectors for ease of emptying

WPL 6m Conical Tank – primary settlement

Primary settlement WPL conical tank at Kungota

Municipality Zgornja Kungota, Slovenia – WPL HiPAF, RADS, Conical Tank and walk in kiosk

6m WPL conical tank – primary settlement

3m WPL Robust Aerobic Digestion (RADS) for sludge storage and sludge reduction. WPLs unique RADS system reduces de-sludge frequencies by up to 4 times.