Odour Control System for Inlet Balancing Tanks

case study details
Screenings Handling Equipment

case study description
Odour Control Unit for Sludge Holding Tanks

other case studies
 
Whetstone STW
Severn Trent Region

Client
Severn Trent Water

Location 
Whetstone, UK

Project Type
Turnkey Wastewater Treatment Plant

Project Duration
 14mths

Project Value
 £804 K 

Completion Date
 July 2007

Project Summary

Whetstone sewage treatment works serves the town of Whetstone in Leicestershire
In order to meet the new  phosphate  consent of 2 mg/l a chemical dosing unit was installed to dose ferrous chloride.

In addition,  the existing launder/ macerator/washpactor installation was replaced with a screw conveyor/ megawasher system and the existing desludge pumps and kiosks were replaced with EMS ram pumps .

An odour control was installed for the two inlet balancing tanks and the sludge holding tanks.

Project Scope

  • Replacement of the existing screenings handling equipment
  • Improvements to washwater system
  • Installation of new inverter drives for the activated sludge pump aerators and a new control system
  • Installation of a Lintott chemical dosing system with 35 m³ of chemical storage
  • Replacement of the two primary desludging pumps
  • Installation of an odour control system for the two inlet balancing tanks
  • Installation of an odour control system for the sludge holding tanks

Added Value/Benefits

  • The chemical dosing unit and odour control plants were installed offline without affecting the operation of the works.
  • The new screenings handling equipment has removed the major operational problems previously encountered with the existing launder/macerator/washpactor system.
  • Re-designed improvements to washwater system after original scope impractical to build.
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Chemical Dosing Unit and Sand Filter

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Phase 1.1 Primary Tank Island: Minworth is Severn Trent’s largest sewage treatment works serving a population equivalent of 1.75 million from Birmingham.

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As part of the AMP4 scheme an extensive programme of capital maintenance was undertaken. Primary thickening sludge plant improvements were necessary to replace the centrifuge plant.