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MUNICIPAL, DRINKING WATER CLARIFICATION
UlphaVeolia Water Solutions & Technologies
UNITED KINGDOM
ACTIFLO: sand ballasted clarification from municipal water
treatment
PROJECT OVERVIEW
Veolia Water Solutions & Technologies provided the
processdesign, construction, installation, testing and
commissioningof 3 Actiflo High Rate Clarifiers and 2 Multiflo
forbackwash water recovery. The project included sand storage,make
up, transfer and recovery system, polymer make upand dosing system,
MCC and software for the abovesystems.
The purpose of the project is to prevent Cryptosporidium,
reduce the levels of manganese in the final water andimprove the
disinfection system by reducing TOC content.
View of Ulpha WTW
PILOT TRIALS
In order to provide confidenceto the potential Client,
VWSinstalled and operated for a 10months period in 1999 - 2000 a200
m
3/hr pilot plant at
Watchgate WTW. The pilotplant provided data for
Actifloperformance and subsequentsand filtration. Based on
these
results UU specified Actiflo forclarification at Ulpha WTW.
THE CLIENT
United Utilities are the 2nd
largest water company inEngland / Wales. They areresponsible for
an area in thenorth west of the UK, whichincludes major Cities such
asManchester and Liverpool.
Area served: 15,378km2Population served: 6.6m
THE WORKS
Ulpha WTW is located nearMillom in Cumbria in the LakeDistrict
National Park and itsupplies 30,000 people in thegreater
Barrow-in-Furness area.
THE ACTIFLO PROCESS
Actiflo
is a very compact process that utilises microsand asa seed for
floc formation. The microsand provides surfacearea that enhances
flocculation and also acts as a ballast orweight.
The resulting microsand ballasted floc display unique
settlingcharacteristics, which allow for clarifier designs with
highoverflow rates and short retention times. These designs
result in system footprints that are between 5 times smallerthan
classic lamella clarifier or dissolved air flottation and upto 20
times smaller than conventional clarification systems ofsimilar
capacity, with an ability to start up from a standbymode of
operation to a steady state operating mode withinminutes.
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THE CONTRACTA design and constructioncontract for United
UtilitiesFramework supplies, HMBAoperating under ECC Option
Ccontract conditions.
Value: 4.7mProgramme: 110 weeksCompletion: March 2005
Actiflo Plant during construction
FLOW DATA(Raw Water Abstraction)
Minimum flow : 7012 m3/day
Average flow : 14024 m3/day
Maximum flow : 22037 m3/day
ACTIFLO CLARIFIERCHARACTERISTICS
Number stream 3
Lamella surface areaper stream 46 m
2
Maximum rise rate 42 m/h
MULTIFLO CLARIFIERCHARACTERISTICS
Number stream 2
Lamella surface areaper stream 6.2 m
2
Maximum rise rate 7.6 m/h
CONSTRUCTION
United Utilities awarded theconstruction contract to VWSwere
sub-contractors to UnitedUtilities Framework suppliers,HMBA
operating under ECCOption C contract conditions.
DESCRIPTION OF ACTIFLO
PROCESS PLANT
Influent Criteria (from Impounding Reservoir) :
Min Av MaxTurbidity 0.2 0.73 480 NTUT.Colour 2 6.6 20 mg/l
Pt/CoMn 0 0.02 0.44 mg/l
Treated Effluent Consents : (95%ile spot samples)
Turbidity < 2 NTUT.Colour < 10 mg/l Pt/Co
ULPHA WATER TREATMENT WORKSPROCESS FLOW DIAGRAM
Veolia Water Solutions & TechnologiesAqua House, 2620 Kings
Court, Birmingham Business Park, Birmingham, B37 7YETelephone: +44
(0) 121 329 4000Fax: +44 (0) 121 329
[email protected]
