Tenders Are Invited For Tls: Pre-Ozone Alternative Upgrade in Australia

Work Detail

The Landers Shute Water Treatment Plant (Wtp) Uses A Conventional Clarification-Filtration Process Followed By Ozone-Bac To Produce A Nominal 140 Ml/D Of Drinking Water Based On 22 Hours Operation, For Supply Of Treated Water To Local Customers And The South East Queensland Water Grid. A Process Assessment Conducted On The Wtp In 2016 Identified Primary Filter Head Loss Accumulation Associated With Biological Activity As A Major Bottleneck To Achieving Sustainable Design Flow And Acceptable Operability.The Generation Of Assimilable Organic Carbon (Aoc), Which In Turn Promotes Excessive Organic Activity And Biomass Accumulation Within The Primary Filter Media Has Been Identified To Be Caused By The Upstream Pre-Ozonation Process Of Raw Water Containing Filter Clogging Algae (Fca). This Is Reducing The Filter Run Times That Can Be Achieved, Reducing The Sustainable Peak Capacity Of The Wtp To Approximately 116 Ml/D, Which Implies A 24Ml/D Reduction From The Design Capacity.An Alternative To Pre-Ozonation Is Required To Limit Biological Growth In The Primary Filters And Maintain Optimal Plant Performance Up To The Rated Design Capacity Of 140 Ml/D Over 22 Hours Of Operation. The Scope Of Works Relate To 2 Distinct Systems (Process Trains):1.Pre-Sedimentation Polymer Dosing System (Poly), And2.Pre-Filtration Chlorination Dosing System (Chlorine).Pre-Sedimentation Polymer Dosing Systemthe Poly Scope Includes The Construction Of A New Dedicated Polymer Dosing Building Complete With Pre-Polymer Batching System, Polymer Dosing Skid, Dosing Lines To The Flocculation Tanks And Electrical Switch Room:• The Batching System Will Consist Of: Oa 550 L Vacuum Loaded Storage Hopper, Oheated Powder Feeder And Wetted Head System, O3,000 L Batching Tank With 0.75 Kw Mixer, And O6,000 L Storage Tank.• Polymer Dosing Skid, Which Will Comprise: O2 X Duty, 2 X Standby Progressive Cavity Pumps, Each Installed With Variable Speed Drives Capable Of Delivering 45 To 669 L/Hr Of Polymer To Each Sedimentation Basin Or Alternatively Delivering 45 To 1,338 L/H To The Flash Mixer.• A New Connection From The Service Water Header That Will Feed The Building. This Will Supply The Batching Tank, Safety Shower, And Hose Reel As Well As Providing Carrier Water For The New Double Container Dosing Injection Lines, Which Will Dose Polymer To Either The Sedimentation Tanks Or Alternatively The Flash Mixer.• Electrical Switch Room (Inclusive Of Chlorine Needs).• Electrical, Instrumentation And Controls Associated Works, And• Associated Works As Detailed Within Project Documentspre-Filtration Chlorination Dosing Systemthe Chlorine Scope Includes The Construction Of Sodium Hypochlorite Unloading, Covered Bunded Storage, Dosing, And Injection Facilities To The Settled Water Channel/Sedimentation Tanks. • The Existing Alum Tanker Offloading Bund: Owill Be Shared, With 2-Off New Dedicated Hypo Unloading Points, Oupgrade To The Existing Alum Unloading Panel, Onew Dedicated Unloading Diversion Pit Panel, And O1-Off New Dedicated 9 Kl Spills Collection Tank.• A New Dedicated Chlorine Storage And Dosing Facility Will Be Installed To The East Of The Unloading Area. This Facility Will Consist Of: O2-Off 22.5 Kl Storage Tanks, And O2-Off Dosing Skids Each With Duty/Standby Pumps Sized For Up To 50 L/Hr. Ohypo Will Be Dosed Neat With Double Contained Dosing Lines Up To The Sedimentation Tanks, And Ocarrier Water Will Be Sourced From The Settled Water Channel Via New Submersible Pumps Located At Each Sedimentation Basis To Assist In The Hypo Manifold Dosing Points. This Will Provide Carrier Water To Deliver The Hypo To All 5 Off Finger Weirs On Both Sedimentation Tanks. • Electrical, Instrumentation And Controls Associated Works, And• Associated Works As Detailed Within Project Documents• Additional Works Included Relocation Of The Existing Ozone Cooling Water Supply And Return Pipelines Locations To Ensure Zero Residual Chlorine Is Available For Compliance With The Generator’S Specifications.

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