Reducing nitrogen crossover in microbial reverse-electrodialysis cells by using adjacent anion exchange membranes and anion exchange resin

2015 ◽  
Vol 1 (6) ◽  
pp. 865-873 ◽  
Author(s):  
Maxwell J. Wallack ◽  
Geoffrey M. Geise ◽  
Marta C. Hatzell ◽  
Michael A. Hickner ◽  
Bruce E. Logan
Keyword(s):  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Anion Exchange Membranes ◽  
Low Concentration ◽  
Reverse Electrodialysis ◽  
Reduced Nitrogen ◽  
Concentration Chamber

An additional low concentration chamber using two adjacent anion exchange membranes filled 50% with resin reduced nitrogen crossover to the anode.

scholarly journals Nitrate-Selective Anion Exchange Membranes Prepared using Discarded Reverse Osmosis Membranes as Support

Membranes ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 377
Author(s):  
Amaia Lejarazu-Larrañaga ◽  
Juan Manuel Ortiz ◽  
Serena Molina ◽  
Yan Zhao ◽  
Eloy García-Calvo
Keyword(s):  
Ion Exchange ◽  
Anion Exchange ◽  
Reverse Osmosis ◽  
Current Density ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Transport Numbers ◽  
Anion Exchange Membranes ◽  
Filtration Membrane ◽  
Reverse Osmosis Membranes

The present work shows a methodology for the preparation of membranes with a high affinity for nitrates. For this purpose, a polymeric mixture containing an anion exchange resin was extended on a recycled pressure filtration membrane used as mechanical support. Different ion exchange resins were tested. The influence in ion fractionation of (i) the type of ion exchange resin, (ii) the use of a recycled membrane as support and (iii) the operating current density during the separation process were studied. Results revealed that the employed anion exchange resin could tune up the transport numbers of the anions in the membrane and enhance the transport of nitrates over sulfates. The use of the recycled filtration membrane as support further increased the transport of nitrates in detriment of sulfates in nitrate-selective membranes. Moreover, it considerably improved the mechanical stability of the membranes. Lowering the operational current density also boosted ion fractionation. In addition, the use of recycled membranes as support in membrane preparation is presented as an alternative management route of discarded reverse osmosis membranes, coupling with the challenging management of waste generated by the desalination industry. These membranes could be used for nitrate recovery from wastewater or for nitrate separation from groundwater.

PEMODELAN MATEMATIS ADSORPSI CO2 DENGAN STRONG BASE ANION EXCHANGE RESIN SEBAGAI ADSORBEN UNTUK PURIFIKASI BIOGAS

2015 ◽  
Vol 5 (1) ◽  
pp. 11
Author(s):  
Anies Mutiari ◽  
Wiratni Wiratni ◽  
Aswati Mindaryani
Keyword(s):  
Anion Exchange ◽  
Pilot Plant ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Scale Up ◽  
Sum Of Squares ◽  
Strong Base ◽  
Model Transfer ◽  
Plant Parameter

Pemurnian biogas telah banyak dilakukan untuk menghilangkan kadar CO2  dan meningkatkan kandungan CH4  yang terkandung di dalamnya. Kandungan CH4 yang tinggi akan memberikan unjuk kerja yang lebih baik. Model  matematis proses adsorpsi CO2 disusun berdasarkan teori lapisan film antar fasa, dimana pada proses yang ditinjau terdapat tiga fase yaitu gas, cair dan padat. Model matematis dari data eksperimental   kecepatan dan kesetimbangan proses adsorpsi CO2 melalui mekanisme pertukaran ion di suatu kolom adsorpsi telah dibuat. Model ini dibuat untuk mencari konstanta yang dapat dipergunakan pada proses scale up data laboratorium ke skala pilot plant. Parameter proses kecepatan yang dicari nilainya adalah koefisien transfer massa massa volumetris CO2 pada fase cair (kLa), koefisien transfer massa volumetris CO2 pada fasegas (kGa) dan tetapan laju reaksi (k1 dan k2). Pada hasil penelitian ini ditunjukkan bahwa nilai parameter yang diperoleh sesuai hasil fitting data dengan model matematis yang digunakan, yaitu model transfer massa pada lapisan film antar fase secara seri: adalah kGa, kla, k1 dan k2  dengan nilai Sum of Squares Error (SSE) rata-rata 0,0431. Perbandingan nilai kGa hasil simulasi dan teoritisnya memberikan kesalahan rata-rata 18,79%. Perbandingan nilai kLa hasil simulasi dan teoritis memberikan kesalahan rata-rata 7,92%.Kata kunci: model matematis, adsorpsi CO2, pemurnian biogas

Catalysis of the Photodecomposition of Chloroform by a Polystyrene Anion Exchange Resin

2013 ◽  
Vol 2 (2) ◽  
pp. 79-87 ◽  
Author(s):  
Laura A. Pena ◽  
Alissa M. Chan ◽  
Larissa R. Cohen ◽  
Karen Hou ◽  
Brent M. Harvey ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin

Anion exchange resin removal of per- and polyfluoroalkyl substances (PFAS) from impacted water: A critical review

2021 ◽  
pp. 117244
Author(s):  
Treavor H. Boyer ◽  
Yida Fang ◽  
Anderson Ellis ◽  
Rebecca Dietz ◽  
Youn Jeong Choi ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Critical Review ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Polyfluoroalkyl Substances
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