Ultrafiltration for water treatment plant, TP 104-25

For research and treatment process development purposes Helsinki Region Environmental Services (later also "client" or "HSY") is in the process of acquiring an ultrafiltration (UF) unit to be retrofitted in an existing sand filter for Pitkäkoski water treatment plant (WTP). Long-term goal for the ultrafiltration pilot is to evaluate ultrafiltration paired with chemical precipitation as a primary natural organic matter (NOM) removal method when purifying cold surface water. Membrane performance and water quality is compared to that of a clarification and sand filtration. Purchased UF process will be preceded by a separate chemical dozing and flocculation unit to ensure effective NOM removal and membrane applicability in variable conditions. Different precipitation chemicals will be used, but the choice of chemicals and applied dose can be discussed with membrane supplier. In principle, the UF unit would be built in one of the existing sand filter pairs: one of the filters will be used for chemical dozing and flocculation, while the other one is reserved for UF units. The main targets in piloting are: - Adequate NOM removal - Act as an effective microbial barrier - Stable turbidity level in permeate from membrane filtration HSY have completed several laboratory scale tests for different UF processes, and the Client has decided to perform a full scale UF pilot based on ceramic submerged membrane filtration. Produced permeate from the ceramic UF unit will be further processed in Pitkäkoski WTP prior to distribution to customers. Pilot process lifetime is expected to be at least 50 years and membranes are assumed to be replaced during the piloting. The ceramic UF treatment could potentially be used in the future to further increase the capacity of Pitkäkoski WTP or as the primary treatment step in a new WTP in the Helsinki Metropolitan area. As the purchased membrane unit will replace part of the existing treatment process and membrane permeate is directed to further treatment, client will oblige actions from process supplier in case warranty clauses are not met.Main features of the procedureThe procurement entity will select from three (3) to five (5) candidates for negotiations. Only those candidates which fulfil the minimum requirements as informed in this invitation to participate will be qualified for the negotiations. The client negotiates with the qualified candidates for awarding the contract. The client qualifies three (3) to five (5) candidates to the negotiations who fulfill the minimum requirements best. If there are less than three candidates who fulfill the minimum criteria, negotiations will be held with those candidates. The evaluation and qualification is based on the information which is submitted by the candidates in their applications. If there are more than five candidates, the candidates will be selected for the negotiation using quality points. The scoring takes place in accordance with A.14. (See the "Common criteria/information" section of the invitation for participation). Proceeding and the preliminary schedule of the procurement process is as follows (negotiated procedure): 1. Publication of the procurement announcement (Invitation to participate). 2. The candidates submit their a request to participate for prequalification at latest 5 January 2026. (Without any commitment from the client). 3. The client evaluates the requests to participates. Only those candidates which fulfil the minimum requirements will be qualified for the negotiations. . 4. Publication for the preliminary invitation for tenders 5. The candidates submit their preliminary tenders at the latest 12 January 2026. (Without any commitment from the client). 6. Negotiations are estimated to be started at calendar week 3/2026. (Without any commitment from the client). The client reserves the right to have more than one negotiation rounds, if necessary. 7. Publication for the final invitation for tender 8. Submitting the final tenders to the client: Estimated time span is in week 6/2026. (Without any commitment from the client). 9. The procurement decision (award of contract): Estimated time span for is week 7/2026. (Without any commitment from the client). As result of the negotiations the final tender request might be revised from the preliminary tender request and differ from the preliminary tender request. The Client reserves the right to revise the preliminary schedule of procurement process during the procurement. All written information is considered not binding by any party until the final tender and signing of the contract agreement. The main purpose of the negotiations is to specify the details of the contents of the project so that the needs of the client are taken into account as well as possible. Negotiations concern among other things the scope of the contract, the technical content, the quality of the technical solutions, commercial items and project management.