Tenders Are Invited For Machinery For The Treatment Of Sewage - Purchase Of A Dewatering Screw Press

Machinery For The Treatment Of Sewage - Purchase Of A Dewatering Screw Press. The Tenderer Wishes To Purchase Mechanical Equipment For The Dewatering Of Digested Mixed Sewage Sludge, Which Works On The Principle Of A Screw Press, An Additional Task Is To Install It In Place Of The Existing Belt Filter Presses In The Sludge Treatment Building Of The Consolidated Technological Building, On The Floor Of The Compacted Sludge Storage, And To Establish A Connecting Surface For Process Control. The Sludge Dewatering Screw Press Is A Mechanical Sludge Dewatering Device That, After Polyelectrolyte Conditioning, Performs Sludge Dewatering With The Help Of A Slowly Rotating Screw And A Stainless Steel Filter Surface In The Shape Of A Rotating Body Surrounding The Screw. The Filter Surface Is Made Of Profiles With A Trapezoidal Cross-Section, The Slots Ensuring Water Drainage Are Widened Outwards (Wedge Wire Sieve) Or A Filter Surface With A Different Structure That Is At Least Equivalent To The Equipment With A Wedge Wire Sieve Surface In Terms Of • Filtering Capacity, • Cake Dry Matter Content, • Leachate Concentration, • Specific Polyelectrolyte Consumption, • Clogging Tendency, • Washing Water Demand. The Screw Press Must Be Of The Same System As The Named System And Must Handle Digested Municipal Sludge. The Auger Gradually Pushes The Sludge Forward Inside The Filter. The Water Forced Out Of The Sludge Leaves Through The Filter Surface, While The Solid Material Gradually Thickens And Leaves At The End Of The Press In A Controlled Manner With A Throttling Cone. The System Is Equipped With A Cover. A Built-In Washing Device Ensures Periodic Cleaning Of The Filter Surface As Needed. The Speed Of The Auger Is Controlled Automatically, Typically Approx. 1 Revolution/Minute. The Documents Relating To The Screw Press Must Include All Purchases, Equipment, And Work Necessary For Functionality, As Well As Compliance With Legislation, Especially Environmental Protection Regulations, Safety, Occupational Health And Fire Protection Regulations. Technological Target Values: • Daily Quantity Of Digested Sludge To Be Processed: 168 M3 (130 – 180 M3) • Sludge Flow Rate: 14 M3/Hour • Sludge Quality: Digested, Degassed, • Sludge Dry Matter Content*: Average: 2.7 % • Organic Fraction Of Sludge Solids (Loss On Ignition): 70 % (68 – 72 %) • Daily Operation Time: 12 Hour (In One Stage Or In Several Stages) • Water Consumption: Maximum 1 M3/Operating Hour, 20 M3/Day (Including The Need For Washing After Daily Shutdown) • Simultaneous Electric Output: Maximum 10 Kw * The Dry Matter Content Of The Sludge To Be Dewatered Does Not Exceed 3 % In 87 % Of The Samples. The Amount Of Sludge Flowing To It Of 14 M3/H May Decrease Above A Dry Matter Content Exceeding 3%. The Parts Of The Screw Press In Contact With Mud, Leachate And Steam From Them Should Be Made Of Material Resistant To These Corrosive Environmental Effects. The Steel Quality Should Be 304L (1.4307) Or Equivalent In Terms Of Resistance To The Effects Of The Given Environment. The Bidder Informs The Bidder That For The Specific Make, Origin, Type That May Be Included In The Technical Description