Wigan WwTW A presentation to Anglian Water 15 th  September 2010
Wigan WwTW Brief description <ul><li>Population equivalent of 400,000 with ½ of this from trade </li></ul><ul><li>Biologic...
Wigan WwTW The Process <ul><li>52,000m 2  of biological filter beds operating in ADF </li></ul><ul><li>Final effluent UV c...
Wigan WwTW The problem <ul><li>Biological filtration </li></ul><ul><ul><li>Overloaded </li></ul></ul><ul><ul><li>BAFF unde...
Wigan WwTW The Problem - Photographs
Wigan WwTW The solution – Biological Filtration <ul><li>Biological filtration stage was chronically overloaded for consent...
Wigan WwTW The solution – Sludge <ul><li>Sludge stage was not performing as dry solids to the centrifuge were insufficient...
Wigan WwTW The solution – UV <ul><li>UV pathogenic inactivation inefficiencies investigated by defining </li></ul><ul><li>...
Wigan WwTW The solution – UV <ul><li>Solution not clear but was to do with the influent characteristics. This was due to <...
Wigan WwTW The Benefits <ul><li>The solution was presented to the client in a phased approach. This would allow </li></ul>...
<ul><li>Any Questions???? </li></ul>
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Wigan Ww Tw Presentation

  1. 1. Wigan WwTW A presentation to Anglian Water 15 th September 2010
  2. 2. Wigan WwTW Brief description <ul><li>Population equivalent of 400,000 with ½ of this from trade </li></ul><ul><li>Biological filter works operating in alternating double filtration </li></ul><ul><li>Regulated under bathing water directive so requires UV disinfection </li></ul><ul><li>Sludge treatment centre with treatment by centrifugation and lime dosing </li></ul>
  3. 3. Wigan WwTW The Process <ul><li>52,000m 2 of biological filter beds operating in ADF </li></ul><ul><li>Final effluent UV channels </li></ul><ul><li>Additional tertiary BAFF plant in construction </li></ul><ul><li>Sludge thickening by consolidation </li></ul><ul><li>Sludge dewatering by centrifugation </li></ul><ul><li>Sludge treatment by lime </li></ul>
  4. 4. Wigan WwTW The problem <ul><li>Biological filtration </li></ul><ul><ul><li>Overloaded </li></ul></ul><ul><ul><li>BAFF under construction but parameter outside design </li></ul></ul><ul><li>UV System </li></ul><ul><ul><li>Applying dose but not effective. Environment Agency aware and asking for solutions </li></ul></ul><ul><li>Sludge treatment </li></ul><ul><ul><li>Centrifuge performance poor and centrate causing foaming and pipe blockages </li></ul></ul>
  5. 5. Wigan WwTW The Problem - Photographs
  6. 6. Wigan WwTW The solution – Biological Filtration <ul><li>Biological filtration stage was chronically overloaded for consent – Additional treatment capacity was required prior to new BAFF plant </li></ul><ul><li>The solution involved the construction of a side stream process </li></ul><ul><li>Either ASP – Due to expected Irish Sea Directive </li></ul><ul><li>Plastic Media – More cost effective solution and could use current filter beds </li></ul>
  7. 7. Wigan WwTW The solution – Sludge <ul><li>Sludge stage was not performing as dry solids to the centrifuge were insufficient </li></ul><ul><li>Low cost solution – Repair consolidation tanks and make minor changes to de-sludging operations </li></ul><ul><li>High cost solution – install sludge thickening and pre-thicken primary sludges </li></ul><ul><li>Both designed to give centrifuges a more efficient operation </li></ul>
  8. 8. Wigan WwTW The solution – UV <ul><li>UV pathogenic inactivation inefficiencies investigated by defining </li></ul><ul><li>Operation and maintenance records </li></ul><ul><li>Influent and effluent records </li></ul><ul><li>Microbiological efficacy testing </li></ul>
  9. 9. Wigan WwTW The solution – UV <ul><li>Solution not clear but was to do with the influent characteristics. This was due to </li></ul><ul><li>Poor performance of secondary treatment process causing high turbidity and particle shielding </li></ul><ul><li>or </li></ul><ul><li>Trade effluent customer (dye manufacturer) causing preferential absorbance of UV decreasing the UV efficacy </li></ul>
  10. 10. Wigan WwTW The Benefits <ul><li>The solution was presented to the client in a phased approach. This would allow </li></ul><ul><li>Quick fixes to enhance the performance of the treatment works and improve the overall treatment process </li></ul><ul><li>Long term investment needs to feed into the PR09 process and the current AMP period </li></ul>
  11. 11. <ul><li>Any Questions???? </li></ul>

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