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Recycling sulphuric acid and sodium hydroxide by industrial scale bipolar electrodialysis
Authors: Jiříček Tomáš | Fehér Jakub | Amrich Michal | Neděla David | Toman František | Velen Bohumil | Cakl Jiří | Kroupa Jan
Year: 2018
Type of publication: ostatní - článek ve sborníku
Name of source: MELPRO 2018 : book of abstracts
Publisher name: Česká membránová platforma (CZEMP)
Place: Česká Lípa
Page from-to: 101
Titles:
Language Name Abstract Keywords
eng Recycling sulphuric acid and sodium hydroxide by industrial scale bipolar electrodialysis 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 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. bipolar membrane; electrodialysis; sulphuric acid; sodium hydroxide

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