18/073 - Ringsend WwTP – Phosphorus Fixation Contract

The Ringsend WwTP treats most of the wastewater arising in the Greater Dublin Area. Irish Water is currently planning an upgrade to the Ringsend Treatment Plant based on the application of aerobic granular sludge technology (Nereda®) which will provide for nutrient removal, including Enhanced Biological Phosphorus Removal (EBPR).The introduction of aerobic granular sludge and EBNR will be carried out in phased upgrades of the Ringsend plant, with the aim (inter alia) of reducing the Phosphorus (P) concentration in the wastewater in compliance with relevant legislation.The maximum average capacity of the Upgraded plant will be approximately 2.4 Million Population Equivalent (PE), where 1 PE is taken as 60 g BOD/day. The project will provide for the recovery of P from liquors generated from the dewatering of sludges arising at the plant, following the commissioning of the EBPR process.It will specifically provide for recovery of P from these liquors in the form of a Magnesium Ammonium Phosphate (Struvite) precipitate. The existing Ringsend plant is noted as providing for Thermal Hydrolysis,Mesophilic Anaerobic Digestion and thermal drying of sewage sludges.The tender competition will provide for the design and construction of the facility and for the operation of the facility for a period following commissioning under a Design Build and Operate form of contract. The works will provide for the recovery of struvite in a form which would comply with standards proposed by the EU STRUBIAS expert group. The new facility will be operated independently from the main wastewater treatment plant with influent sludge liquors delivered to the facility at Interface points with the existing works, and an interface for the return of the treated liquors to the existing works. For details on scope of works please refer to PQQ Documents.

Works

24/09/2018 12:00:00

45252127-4  Wastewater treatment plant construction work
24313220-9  Phosphates
24420000-4  Phosphatic fertilisers
45000000-7  Construction work
45111000-8  Demolition, site preparation and clearance work
45223210-1  Structural steelworks
45223500-1  Reinforced-concrete structures
45232421-9  Sewage treatment works
45232422-6  Sludge-treatment works
71320000-7  Engineering design services
71322000-1  Engineering design services for the construction of civil engineering works
71334000-8  Mechanical and electrical engineering services
90420000-7  Sewage treatment services
90481000-2  Operation of a sewage plant
90513500-1  Treatment and disposal of foul liquids