The new concept of MIEX® resin dose categories. Swelling effect, reactor steady-state balance, and NOM removal process control

• Autorzy: Mołczan Marek

Identyfikatory

DOI

10.37190/epe240105

• Języki publikacji: EN

Abstrakty

EN

The use of powdered adsorbents for water purification has many advantages and one major drawback – lack of regeneration due to difficulty in separating powdered particles. This weakness is attempted to be broken by powdered magnetic adsorbents, in particular magnetic ion exchange resins, used to remove natural organic matter (NOM) from water. In this water treatment process, NOM removal is controlled by the adsorbent content in the reactor (adsorbent dose) and the degree of its saturation. The control over the dose and saturation is done by mutual relations between the regenerated resin stream directed to the reactor and the saturated resin stream received from the reactor. An obstacle in balancing these streams is a variable volume of the adsorbent resulting from its varied swelling, depending on the features of the solution and saturation of the adsorbent. For this reason, it was proposed to distinguish new resin dose and content categories adequate to these changes, the use of which allows full control of both streams. Thus, the reactor feed stream was associated with relative fresh resin content (RRC) and relative fresh resin dose (RRD), which indicate the volume occupied by the regenerated adsorbent in the solution of water during purification. However, the stream received from the reactor was associated with saturated resin content (SRC) and saturated resin dose (SRD), which indicate the volume occupied by saturated adsorbent in the solution of water under treatment. In turn, these two categories of contents/doses are related to the swelling degree (ηSR). Another role was assigned to the third dose category, which is absolute fresh resin dose (ARD), referring to the volume occupied by the regenerated adsorbent in the solution of demineralized water. Thanks to two key features with reference properties (demineralized water, regenerated adsorbent), ARD allows one to transfer laboratory results to practice and to compare the results of various research. The resin loss factor described by the ηLS indicator was also included in this structure.

Słowa kluczowe

EN

ion exchange resin; process control; purification; river; water treatment; demineralized water; magnetic adsorbents; Ion exchange

PL

żywica jonowymienna; kontrola procesu; oczyszczanie; rzeka; uzdatnianie wody; woda demineralizowana; adsorbenty magnetyczne; wymiana jonowa

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Environment Protection Engineering
• Rocznik: 2024
• Tom: Vol. 50, nr 1
• Strony: 91--103
• Opis fizyczny: Bibliogr. 35 poz., rys., tab.

Twórcy

autor

Mołczan Marek

• Wrocław University of Science and Technology, Faculty of Environmental Protection Engineering, Chair in Water and Wastewater Treatment Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

• https://orcid.org/0000-0003-3011-6277

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