Publikace detail

Recycling sulphuric acid and sodium hydroxide by industrial scale bipolar electrodialysis

Rok: 2018

Druh publikace: ostatní - článek ve sborníku

Název zdroje: MELPRO 2018 : book of abstracts

Název nakladatele: Česká membránová platforma (CZEMP)

Místo vydání: Česká Lípa

Strana od-do: 101

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
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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