Tenders Are Invited For Construction Of Home Sewage Treatment Plants In The Promna Commune in Poland

Work Detail

1. The Subject Of The Order Are Construction Works Under The Task Titled: Construction Of Home Sewage Treatment Plants In The Promna Commune.2. The Scope Of Works Constituting The Subject Of The Order Includes The Construction Of 53 Home Sewage Treatment Plants In Towns In The Promna Commune. Number Of Household Sewage Treatment Plants: 1-6 Pe In 46 Pcs., 7-8 Pe In 7 Pcs.3. Construction Of A Sewage Treatment Plant: The System Is Characterized By A Compact Structure And Includes: 1) A Tank Made Of Grp Material, Inside Which There Are Three Separated Treatment Zones: • Primary Settling Tank, • Biological Zone, • Secondary Settling Tank. 2) Control Used To Set The Operation And Signal Any Failures.4. Principle Of Operation: Biological-Mechanical Treatment Plants 1, 5, 6 And 8 Pe Are Based On The Technology Of Rotating Biological Beds. The Monolithic Tank Made Of Grp Material Contains Three Treatment Zones In Which Domestic And Domestic Wastewater Treatment Processes Take Place. Raw Sewage Entering The Treatment Plant Tank Is Subjected To Mechanical Treatment In The First Chamber - The Primary Settling Tank. This Zone Mainly Retains Solid Mineral And Organic Particles, As Well As Fats, Which Should Be Periodically Removed By The Septic Tank. In The Next Phase, The Sewage Is Fed Through A System Of Installed Scoops To The Biological-Oxygen Chamber, Where A Biological Bed Covered With A Biologically Active Membrane Is Placed On A Rotating Shaft. Thanks To The Scoops, The Flow Of Sewage Is Constant, Which Makes The Treatment Plant More Resistant To Uneven Daily Inflows. Thanks To The Rotational Movement, The Bed Surface Is Cyclically Immersed In The Sewage And Emerges In Contact With Air. Thanks To This Structure, The Biofilm Created On The Beds Has Continuous Access To Organic Compounds Contained In The Sewage And Oxygen From The Air, Which Leads To Full Nitrification In The Treatment Plant. Through This Zone, The Sewage Flows By Gravity To The Last Treatment Chamber Of The Secondary Settling Tank. The Role Of This Section Is The Final Clarification Of Sewage After Mechanical And Biological Treatment And Partial Denitrification. Sewage Flows From The Secondary Settling Tank By Gravity To The Receiver.5. Infiltration System: The Treated Sewage Will Be Managed Through A Plot In The Ground. In Relation To The Existing Soil And Water Conditions On The Plot, The Following Activities Should Be Performed: In The Place Where The Drainage Pipes Are Laid, A Trench Should Be Made With The Area - See Pzt, In The Native Soil With A Depth Of 0.8 - 1.3 M, Depending On The Slopes Obtained. The Minimum Distance Between Infiltration Lines Is 0.5 M. In Such Prepared Ditches, A Filter Layer Of Washed Gravel With A Granulation Of 16 - 32 Mm Should Be Placed, The Layer Of Which Should Be 0.36 M, So That After Pouring The Above-Mentioned Material, The Slope Of The Substrate Intended For Laying Pvc Pipes Is At Least 0.5%. Pvc Pipes With Pre-Cut Holes Should Be Placed On The F

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