Sector Utilities
Project type Refurbishment
Services provided Installation
Year completed 2013
Project location South West England
Client South West Water
Products used AnoxKaldnes™ MBBR technology
 
 

Context

SouthWestWater Ltd (STW) is responsible for providing reliable, efficient and high quality drinking water and wastewater services to a population of 1.5m in South West England.

In order to improve the performance of the existing works at Plymouth Central STQ and to cater for future increases in loads, Veolia Water Technologies designed a solution that involved treatment of sludge liquors with VWT AnoxKaldnes™ MBBR technology.

At the Plymouth Wastewater Treatment Works the primary and return biological solids are co-settled in a chemically assisted lamella settler. This settled sludge is dewatered by centrifuges and the centrate liquors are combined with the incoming sewage for settlement in the lamella. There is a significant concentration of dissolved organic matter in the return liquors which is not removed in the primary process and leads to an increased load to the down stream Biological Aerated Flooded Filter (BAFF).

Project solution

In order to reduce the dissolved organic content of the liquors, a side-stream liquor treatment plant “MBBR” was installed.

Primary and return biological solids are co-settled in a chemically assisted lamella settler. The settled sludge is dewatered by centrifuges. An existing sump has been converted to a balancing tank, providing an operating volume of 176m3. A balanced flow is pumped to the MBBR which consists of a single rectangular tank divided into two cells arranged in series. The 2 cell reactor configuration offers additional removal efficiency and provides significant process security. The MBBR process is a fixed film system and consequently provides a level of resilience to shock and toxic loads potentially present in this type of effluent stream. The MBBR effluent is returned to the inlet works.


Context

SouthWestWater Ltd (STW) is responsible for providing reliable, efficient and high quality drinking water and wastewater services to a population of 1.5m in South West England.

In order to improve the performance of the existing works at Plymouth Central STQ and to cater for future increases in loads, Veolia Water Technologies designed a solution that involved treatment of sludge liquors with VWT AnoxKaldnes™ MBBR technology.

At the Plymouth Wastewater Treatment Works the primary and return biological solids are co-settled in a chemically assisted lamella settler. This settled sludge is dewatered by centrifuges and the centrate liquors are combined with the incoming sewage for settlement in the lamella. There is a significant concentration of dissolved organic matter in the return liquors which is not removed in the primary process and leads to an increased load to the down stream Biological Aerated Flooded Filter (BAFF).

Project solution

In order to reduce the dissolved organic content of the liquors, a side-stream liquor treatment plant “MBBR” was installed.

Primary and return biological solids are co-settled in a chemically assisted lamella settler. The settled sludge is dewatered by centrifuges. An existing sump has been converted to a balancing tank, providing an operating volume of 176m3. A balanced flow is pumped to the MBBR which consists of a single rectangular tank divided into two cells arranged in series. The 2 cell reactor configuration offers additional removal efficiency and provides significant process security. The MBBR process is a fixed film system and consequently provides a level of resilience to shock and toxic loads potentially present in this type of effluent stream. The MBBR effluent is returned to the inlet works.


 
 
 
Downloads
  • Case study: Plymouth WTW
    Case study: Plymouth WTW
    2pp 216.32KB
    Download
 
 
 
Enquire
 

Related entries

  • Veolia Water Technologies UK: AnoxKaldnes™ Hybas™ activated sludge and MBBR hybrid
    AnoxKaldnes™ Hybas™ activated sludge and MBBR hybrid
    Veolia Water Technologies UK
    The AnoxKaldnes™ Hybas™ hybrid process combines AnoxKaldnes™ MBBR biofilm technology and an activated sludge process in the same tank. The Hybas™ hybrid process is suitable for nitrogen removal from municipal wastewater and for...

Also by Veolia Water Technologies UK

Veolia Water Technologies UK address and contact details

Veolia Water Technologies UK
Windsor Court
Kingsmead Business Park
High Wycombe
HP11 1JU
Tel: 020 3567 7400
View on map
 
Follow Veolia Water Technologies UK
 
Not found what you're looking for? View other options