Ion Exchange Sample Clauses

Ion Exchange. ‌ 99Tc exists in the Northwest Plume groundwater as the pertechnetate ion (TcO4), which can be removed by ion exchange technology. During the first two years of pilot operation, four types of ion exchange resin were evaluated for performance. Based on cost and effectiveness, Purolite A-520-E was selected as the preferred resin. Ion exchange is carried out in a pressurized vessel that contains a bed of ion exchange resin composed of small, spherically-shaped beads. Effluent from the air stripper flows through a header at the top of the vessel, flows downward to a lateral collection assembly at the bottom of the vessel, and exits the ion exchange vessel. As contaminated water flows downward through the resin bed, anions are exchanged for chloride ions on the resin beads. Pertechnetate ions have a greater affinity for some resins than other anions in the groundwater (sulfates, chlorides, nitrates, etc.); thus, pertechnetate ions tend to preferentially adsorb onto the surface of the resin beads (DOE 1993, Section 3.1). As shown in Section 7, water treated at the NWPGS passes through two resin vessels arranged in series (i.e., a lead and lag vessel); there are two sets of lead and lag vessels that treat water in parallel. Pertechnetate ions passing through the ion exchange bed are removed until the available exchange sites are filled, after which these ions will begin to “leak” through the ion exchange columns and appear in the effluent stream. This “leaking” is defined as breakthrough, which is determined from sampling data. Water samples are collected monthly from the lead vessels influent and effluent for 99Tc analysis. Generally, when effluent concentration approaches 100% of the influent concentration, the planning process to replace the ion exchange resin in the lead vessels begins. The effluent from the lead vessels pass through the lag vessels where the resin removes pertechnetate ions so that the system remains operational while preparations are made to replace the resin in the lead vessels. After the lead vessels receive new resin, they are placed in the lag positions; doing so ensures that the lag vessels have fresh resin to adequately perform the “polishing” function in this treatment process.
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Ion Exchange. 99Tc exists in the Northwest plume groundwater as the pertechnetate ion (TcO4), which can be removed by ion exchange technology. During the first two years of pilot operation, four types of ion exchange resin were evaluated for performance. Based on cost and effectiveness, Purolite A-520-E was selected as the preferred resin. Ion exchange is carried out in a pressurized vessel that contains a bed of ion exchange resin composed of small, spherically-shaped beads. Effluent from the air stripper flows through a header at the top of the vessel, flows downward to a lateral collection assembly at the bottom of the vessel, and exits the ion exchange vessel. As contaminated water flows downward through the resin bed, anions are exchanged for chloride ions on the resin beads. Pertechnetate ions passing through the ion exchange bed are removed until the available exchange sites are filled, after which these ions will begin to “leak” through the ion exchange columns and appear in the effluent stream. This “leaking” is defined as breakthrough, which is determined from sampling data. Pertechnetate ions have a greater affinity for some resins than other anions in the groundwater (sulfates, chlorides, nitrates, etc.); thus, pertechnetate ions tend to preferentially adsorb onto the surface of the resin beads (DOE 1993, Section 3.1).
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Related to Ion Exchange

  • Information Exchange As soon as reasonably practicable after the Effective Date, the Parties shall exchange information regarding the design and compatibility of the Interconnection Customer’s Interconnection Facilities and Participating TO’s Interconnection Facilities and compatibility of the Interconnection Facilities with the Participating TO’s Transmission System, and shall work diligently and in good faith to make any necessary design changes.

  • Shift Exchange The Employer and the Union agree that shift exchanges are a useful process to allow employees more flexibility and improved work/life balance. Employees within an institution who have the same job classification will be allowed to exchange full shifts for positions in which they are qualified. The shift exchange process will not be used to circumvent the bid system or the supervisory chain of command. Shift exchanges will be in accordance with the following:

  • Off-Exchange Transactions In some jurisdictions, and only then in restricted circumstances, firms are permitted to effect off-exchange transactions. The firm with which you deal may be acting as your counterparty to the transaction. It may be difficult or impossible to liquidate an existing position, to assess the value, to determine a fair price or to assess the exposure to risk. For these reasons, these transactions may involve increased risks. Off-exchange transactions may be less regulated or subject to a separate regulatory regime. Before you undertake such transactions, you should familiarize yourself with applicable rules and attendant risks.

  • Foreign Exchange PFPC Trust and/or sub-custodians may enter into or arrange foreign exchange transactions (at such rates as they may consider appropriate) in order to facilitate transactions under this Agreement, and such entities and/or their affiliates may receive compensation in connection with such foreign exchange transactions.

  • Data Exchange Each Party shall furnish to the other Party real-time and forecasted data as required by ERCOT Requirements. The Parties will cooperate with one another in the analysis of disturbances to either the Plant or the TSP’s System by gathering and providing access to any information relating to any disturbance, including information from oscillography, protective relay targets, breaker operations, and sequence of events records.

  • Shift Exchanges In no event shall any overtime be payable as a result of employees voluntarily exchanging shifts.

  • Currency Exchange All payments under this Agreement shall be payable, in full, in Dollars, regardless of the country(ies) in which sales are made. For the purposes of computing Net Sales of Licensed Products that are sold in a currency other than Dollars, such currency shall be converted into Dollars as calculated at the rate of exchange for the pertinent quarter or year to date, as the case may be, as used by Celgene in producing its quarterly and annual accounts, as confirmed by their respective auditors.

  • Foreign Exchange Risk Any foreign currency investments and exposures would normally be hedged via the use of forward foreign exchange contracts and/or currency options or preferably by a natural hedge with foreign pay liabilities of the Insurance Company. Unhedged foreign investments will be limited to 10% of invested assets at cost if judged appropriate. Unhedged exposure above this amount must be approved by the Investment Committee.

  • 1031 Tax Exchange A material part of the consideration to Buyer for purchasing the Property from Seller and Seller selling the Property to Buyer is that both Buyer and Seller have the option to qualify this transaction as part of a tax-deferred exchange under Section 1031 of the Internal Revenue Code.

  • Trunk Data Exchange 65.9.1 Each Party agrees to service trunk groups to the blocking criteria in Section 64.3.4 in a timely manner when trunk groups exceed measured blocking thresholds on an average time consistent busy hour for a twenty- one (21) Day study period. The Parties agree that twenty-one (21) Days is the study period duration objective unless mutually agreed otherwise. The study period will not include a holiday.

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