Antsla reoveepuhasti energiatõhususe tõstmise projekteerimis-ehitustööd

The contract timeline is as follows:

The total duration for the performance of works is 12 months from the signing of the contract.

Key milestones and phases include:

• Phase I: Up to 2 months from the signing of the contract, which involves completing necessary surveys and checking initial data for the design, with the findings submitted to the Client.
• Phase II: Up to 4 months from the signing of the contract, by which time the working design must be complete, coordinated with relevant parties, and submitted to the Building Register for the construction permit or notification process.
• Phase III: Up to 11 months from the signing of the contract, during which the wastewater treatment plant must be reconstructed, technical commissioning and at least a 30-day trial run successfully completed, analyses and adjustments made, and as-built documentation submitted to the Client.

The full execution time of 12 months from the contract signing also includes rectifying any deficiencies found during the trial run, coordinating the complete as-built documentation with the Client, and submitting the proper application for an occupancy permit along with all required documents to the Building Register. The time taken for the issuance of the occupancy permit is not part of the Contractor's deadline, provided the delay is not attributable to the Contractor's fault or inaction.

The core scope of work for this tender, titled "ANTSLA REOVEEPUHASTI ENERGIATÕHUSUSE TÕSTMISE PROJEKTEERIMIS-EHITUSTÖÖD" (Antsla Wastewater Treatment Plant Energy Efficiency Improvement Design-Build Works), is a fixed-price design-build turnkey contract focused on enhancing the energy efficiency of the wastewater treatment plant.

The Statement of Work summary and core deliverables include:

• Existing Situation Analysis and Data Verification: Control and analysis of the current operational state and initial data.
• Design and Approvals: Comprehensive design works for all project stages, including hydraulics, control systems, air systems, wash water booster systems, technology, structures, fasteners, pipelines, electrical installations, automation, measurement, SCADA, temporary work arrangements, occupational safety, and restoration. This also covers obtaining necessary approvals, notices, and permits.
• Energy Efficiency Improvement Works: This involves specific equipment replacements and optimizations, such as:
• Replacement of equalization tank pumps (4 pcs) and mixer (1 pc) with new control systems.
• Replacement of batch reactor air blowers (3 pcs) and sludge thickener air blower (1 pc), along with air consumption optimization.
• Replacement of aerators in two SBR tanks and SBR mixers (2 pcs) with demand-based control.
• Automation of the purification process.
• Implementation of ammonium measurement and aeration control (2 sensors).
• Energy and process measurement and monitoring, including two air flow meters.
• SCADA and remote control interfacing.
• Analysis and optimization of EP.1 and MT.1 washing cycles and booster pump P.11 operation.
• Demolition, installation, and management of temporary work arrangements.
• Verification and documentation of achieved energy efficiency performance requirements.
• Construction and Installation Works: This covers all civil and structural works, including equipment carriers, foundations, guides, lifting points, penetrations, corrosion protection, surface coatings, finishing, and ensuring water tightness and structural reliability.
• Air Ducting and Associated Components: Installation of all necessary pipes, compensators, valves, condensate removal systems, measuring points, carriers, penetrations, marking, and insulation.
• Electrical, Automation, Measurement, Cabling, and Interface Works: Including all related electrical installations, automation systems, measurement devices, cabling, and system interfaces.
• Testing, Commissioning, and Handover: Conducting testing, commissioning, and a minimum 30-day trial run.
• Documentation, Training, and Warranty: Providing all required documentation, training for the client's personnel, and fulfilling warranty obligations.
• Restoration Works: Restoring any damaged surfaces and systems to their pre-work condition.

The overall objective is to achieve an energy saving target of approximately 48,229 kWh/a, representing a 32% reduction compared to the energy audit baseline, with a target annual plant consumption of approximately 102,216 kWh/a and a specific electricity consumption of up to 70 kWh/(ie-a).

Explicitly excluded from the scope are the establishment of solar electricity or battery storage systems, and modifications to the main sludge treatment process, apart from the specified sludge thickener blower replacement, air consumption optimization, and analysis/optimization of specific washing cycles. Owner's supervision services are also not part of the contractor's scope.