The concentrated brine after hardness removal is pumped into the bipolar membrane electrodialysis assembled with cation-exchange membrane (CMB), anion-exchange membrane (ACM), and bipolar membrane (BP-1E) from Astom in Japan through the circulating pump (MP-70RZ, New Xishan) with the volume of 4L for each chamber. The volume of each chamber tank was 4 L. A stable cycle was performed for half an hour before starting the power supply to remove air bubbles from the membrane stack. Then the power supply (ZJ-2100-70, Zhengjie) was started and the current was adjusted to be constant, and the data on the conductivity of the salt chamber, the concentration of the product acid solution, the concentration of the alkaline solution with the batch processing time, as well as the data on the energy consumption and the efficiency of the current of the different batch processing were recorded. The inlet concentrated brine TDS was 20 g/L, the membrane area was 510 cm2, the brine flow rate was 130 L/h, the water temperature was 30 ℃, and the membrane stack structure was BM-AEM-CEM-BM. The concentrated brine in the salt chamber was replaced when the conductivity of the salt chamber was about 6 μS/cm, and the inlet was recycled for three times in total. The measurement accuracy was taken to two decimal places.
When the concentrated brine was circulated three times in the bipolar membrane electrodialysis, the conductivity of the salt chamber was reduced from 20 g/L to 4 g/L; the alkali production concentration was 0.6 mol/L; and the acid production concentration was 0.7 mol/L. The energy consumption of the corresponding membrane stack was increased from 0.88 to 1.87 kWh/(kg NaOH); and the current efficiency was reduced from 72% to 65%.
This dataset is mainly applied to the study of concentrated brine resource utilization in brackish water desalination system.
Experimentally obtained.
The area of electrodialysis diaphragm was 510 cm2, the flow rate of brine was 130 L/h, and the water temperature was measured experimentally at 30℃.
(1)Data production process: The concentrated brine after hardness removal is pumped by a circulating pump (MP-70RZ, New Nishiyama) into a bipolar membrane electrodialysis assembled with cation-exchange membranes (CMB), anion-exchange membranes (ACM), and bipolar membranes (BP-1E), which are produced by Astom, Japan, with a volume of 4 L for each chamber. The volume of each chamber reservoir was 4 L. A steady cycle was performed for half an hour before starting the power supply to remove air bubbles from the membrane stack. Then the power supply (ZJ-2100-70, Zhengjie) was started and the current was adjusted to be constant, and the data on the changes of conductivity of the salt chamber, acid concentration of the product, and alkaline concentration with the batch processing time, as well as the data on the energy consumption and current efficiency of different batch processes were recorded.
(2) Methods: Inlet concentrated brine TDS is 20 g/L, membrane area 510 cm2, brine flow rate 130 L/h, water temperature 30 ℃, membrane stack structure BM-AEM-CEM-BM. When the salt chamber conductivity is about 6 μS/cm, the concentrated brine is replaced, and the inlet is recycled three times in total. The measurement accuracy was taken to two decimal places.
(3) Results: when the concentrated brine in the bipolar membrane electrodialysis after three cycles, the salt chamber conductivity decreased from 20 g/L to 4 g/L; the alkali production concentration was 0.6 mol/L; the acid production concentration was 0.7 mol/L. The energy consumption of the corresponding stack of membranes increased from 0.88 to 1.87 kWh/(kg NaOH); the current efficiency decreased from 72% to 65%.
| # | number | name | type |
| 1 | 2017YFE0114200 | National key R & D plan |
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CSTR:11738.11.ncdc.MDBW.2021.11
10.12072/ncdc.MDBW.db0013.2021