Tender for the Supply of Aluminum-based Coagulants by Przedsiębiorstwo Wodociągów i Kanalizacji Sp. z o.o. in Gorzów Wielkopolski, Poland

Tender Reference: 77682-2026

Internal Identifier: ZP/2/2026/PL

Project Name: Supply of 300 tons of aluminum-based coagulant to the wastewater treatment plant in Gorzów Wielkopolski

Tender Type: Supply of Goods (primary), with ancillary services

Procurement Procedure: Open procedure

Divided into lots: No (only 1 lot)

Core Content of the Contract:

Supply of Goods: Supply of a total of 300 tons of aluminum-based coagulant in batches to the designated wastewater treatment plant.

Chemical Composition and Physical Properties:

Main Component: Should be liquid aluminum chloride or polyaluminum chloride. Specific form (e.g., liquid concentration, Basicity (B) value for PAC) will be specified in the technical specifications.

Active Ingredient Content: Typically specifies a minimum mass percentage of alumina (e.g., 10%-12% for liquid product).

Impurity Limits: Strict limits on heavy metal content (e.g., lead, cadmium, mercury, chromium, arsenic), compliant with relevant Polish and EU environmental standards (e.g., REACH Regulation).

Physical Properties: Specify density, viscosity, freezing point (important for storage in cold climates), and color.

Compliance with Standards: Product must comply with Polish standards or recognized EU/international standards (e.g., EN 883, EN 1302), and a declaration of conformity must be provided.

Performance Requirements:

Coagulation Efficacy: The product must achieve specific turbidity, color, and phosphorus (total phosphorus, phosphate) removal targets through jar tests verified under the raw water (wastewater) conditions specified by the contracting authority.

Adaptability: The coagulant should have good adaptability to variations in influent water quality (pH, temperature, organic content) and be compatible with the existing processes at the wastewater treatment plant (e.g., pre-sedimentation, biological treatment) without causing negative impacts.

Safety: Provide a Material Safety Data Sheet compliant with EU CLP Regulation. The product should include handling instructions for its corrosive nature and corresponding guidelines for safe storage and operation.

Packaging, Transport, and Delivery:

Packaging Form: Likely requires the use of returnable dedicated ISO tank containers (IBC totes) or bulk tanker trucks. If IBCs are used, material (e.g., high-density polyethylene), volume, valve type, and cleaning requirements must be specified.

Delivery Schedule: "Batch delivery" means the contract will stipulate a flexible delivery schedule, typically based on the purchaser's monthly or quarterly demand forecasts, triggered by "delivery orders." Bids must include a detailed logistics response plan ensuring delivery within a specified number of days (e.g., 48-72 hours) after notification.

Delivery Location: Precisely to the designated receiving point within the Gorzów wastewater treatment plant (unloading platform or tank connection point).

Ancillary Services: During contract execution, lease, install, and commission a dosing unit for applying the aluminum-based coagulant. The unit is temporary and must be removed after the contract ends.

Unit Scope and Design:

Complete System: The unit is a complete, temporary skid-mounted dosing system.

Core Components Include:

Storage Unit: One or more temporary storage tanks (e.g., PE or FRP material) with total capacity sufficient for at least several days of consumption, equipped with level gauges, vent filters, overflow, and drain ports.

Dosing Unit: One or more precision metering pumps (e.g., mechanical diaphragm pumps or hydraulic diaphragm pumps) with variable frequency control for stepless flow adjustment. Pump head material must be corrosion-resistant (e.g., PVC, PP, PVDF).

Piping and Valves: Complete inlet piping, valves (ball valves, check valves), pressure gauges, pulsation dampeners, safety relief valves. Piping material should be corrosion-resistant plastic (e.g., UPVC, PP) or stainless steel (e.g., SS316).

Control System: The core is a local control cabinet with a touch screen for setting and displaying dosing rate, start/stop, and alarms. It should have an interface for communication with the wastewater treatment plant's central control system (typically 4-20mA analog signal or Modbus TCP/IP protocol) to receive commands for proportional dosing based on signals from the plant's flow meters or water quality analyzers.

Design Standards: System design must comply with the Polish Machinery Directive, Low Voltage Directive, and Electromagnetic Compatibility Directive, and bear the CE marking. Electrical installation must comply with Polish electrical regulations.

Installation, Commissioning, and Training:

Site Preparation: PWiK will provide the installation site (foundation), power connection point (e.g., 400V/50Hz), and possibly process water/drainage connections. The bidder is responsible for all on-site installation work.

Installation and Commissioning:

Mechanical Installation: Positioning and securing the skid, connecting piping to the plant's designated dosing point.

Electrical and Instrumentation Installation: Wiring, communication connections.

Commissioning: Individual equipment commissioning, system integration testing, simulation runs, and testing integration with the actual process. Must be conducted jointly with PWiK technical personnel to ensure correct control logic (e.g., proportional dosing based on influent flow, or feedback adjustment based on effluent phosphorus concentration).

Performance Testing: Verify the actual dosing accuracy of the metering pumps at different frequencies (e.g., using calibrated containers), ensuring compliance with technical specifications (e.g., accuracy ±1%).

Training: Comprehensive training for PWiK's operation and maintenance personnel.

Content includes: System principles, daily operation (start/stop, parameter setting), routine maintenance (pump head replacement, filter cleaning), fault diagnosis and alarm handling, safety precautions.

Operation and Maintenance Services during the Lease Period:

Preventive Maintenance: Provide a schedule for regular inspection and maintenance services (e.g., quarterly or semi-annually), including checking pump component wear, calibrating instruments, cleaning filters, checking electrical connections, etc.

Spare Parts Supply: The bid should include a list of critical spare parts and recommended inventory, with a commitment to rapid provision during the lease period (e.g., delivery to site within 24 hours).

Emergency Response: Provide a 7x24-hour emergency technical support hotline. Commit to resolving issues within specified timeframes after receiving a fault notification (e.g., response within 4 hours, on-site technician within 24 hours if necessary).

Performance Monitoring and Reporting: Must regularly (e.g., monthly) submit operation reports to PWiK, including operating hours, total dosage, energy consumption, maintenance activities, and any fault records.

Post-Contract Handling:

Dismantling and Restoration: Upon contract expiry, the bidder is obligated to completely dismantle the entire dosing unit and restore the site to its original condition. All leased assets (the unit itself) will be recovered by the bidder.

Knowledge Transfer: Provide complete as-built drawings, operation and maintenance manuals, software backups, and a final version of the spare parts list.

Estimated Total Contract Value: 594,000 Polish Zloty (VAT excluded)

Contract Duration: 12 months

Place of Performance: Gorzów Wielkopolski, Lubusz Voivodeship, Poland