Recycling Suplhuric Acid and Sodium Hydroxide by Industrial Scale Bipolar Electrodialysis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F28676092%3A_____%2F18%3AN0000049" target="_blank" >RIV/28676092:_____/18:N0000049 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.melpro.cz/" target="_blank" >https://www.melpro.cz/</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Recycling Suplhuric Acid and Sodium Hydroxide by Industrial Scale Bipolar Electrodialysis

Popis výsledku v původním jazyce

Electrodialysis has been a good and reliable choice in mine water treatment, as it can pre-concentrate large volumes of water before evaporation and crystallization. Bipolar electrodialysis uses a special type of membranes which allows for the formation of acids and bases from the respective salt (1), hence presenting an option to recycle the original chemicals in site. In this study we present the results from long term evaluation of an industrial bipolar stack, tested in the mine water treatment facility of GEAM, Dolní Rožínka, Czech Republic. The stack was composed of heterogeneous membrane Ralex® BM-3.0, produced without compression moulding by co-extrusion of two cation and anion exchange layers (2). The resulting 100-cell stack has an active membrane surface of 50,2 m2. The production lasted for six months, producing app. 4 m3/day of 4% sodium hydroxide and app. 12 m3/day of 1.5% sulphuric acid. The scale-up estimate resulted in a 12 module line that would treat over 15 t/h of the reverse osmosis retentate. From the long term data an economic feasibility was estimated both for the current and new technology. When retrofitting an existing plant without the option to decrease the evaporator capacity, payback time was estimated to around 13.5 years, whereas with a green field project it is dramatically reduced to three years, meaning that bipolar electrodialysis can be very effective in reducing both investment and operating costs of the thermal step.

Název v anglickém jazyce

Recycling Suplhuric Acid and Sodium Hydroxide by Industrial Scale Bipolar Electrodialysis

Popis výsledku anglicky

Electrodialysis has been a good and reliable choice in mine water treatment, as it can pre-concentrate large volumes of water before evaporation and crystallization. Bipolar electrodialysis uses a special type of membranes which allows for the formation of acids and bases from the respective salt (1), hence presenting an option to recycle the original chemicals in site. In this study we present the results from long term evaluation of an industrial bipolar stack, tested in the mine water treatment facility of GEAM, Dolní Rožínka, Czech Republic. The stack was composed of heterogeneous membrane Ralex® BM-3.0, produced without compression moulding by co-extrusion of two cation and anion exchange layers (2). The resulting 100-cell stack has an active membrane surface of 50,2 m2. The production lasted for six months, producing app. 4 m3/day of 4% sodium hydroxide and app. 12 m3/day of 1.5% sulphuric acid. The scale-up estimate resulted in a 12 module line that would treat over 15 t/h of the reverse osmosis retentate. From the long term data an economic feasibility was estimated both for the current and new technology. When retrofitting an existing plant without the option to decrease the evaporator capacity, payback time was estimated to around 13.5 years, whereas with a green field project it is dramatically reduced to three years, meaning that bipolar electrodialysis can be very effective in reducing both investment and operating costs of the thermal step.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20402 - Chemical process engineering

Projekt

<a href="/cs/project/LO1418" target="_blank" >LO1418: Progresivní rozvoj Membránového inovačního centra</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů