Ceramic membrane pretreatment of monosodium glutamate isoelectric supernatant to facilitate (NH4)2SO4 recovery by electrodialysis
✍ Scribed by Hongyan Ren; Fubao Sun; Shaoyuan Shi; Wei Cong
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2008
- Tongue
- English
- Weight
- 205 KB
- Volume
- 83
- Category
- Article
- ISSN
- 0268-2575
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✦ Synopsis
Abstract
BACKGROUND: The large output of monosodium glutamate in China has produced huge amounts of isoelectric supernatant containing 40–60 g L^−1^ (NH~4~)~2~SO~4~. With the increasing national emphasis on environmental protection and recycling, it is necessary to find a cost‐effective and environment‐friendly alternative to recover the (NH~4~)~2~SO~4~. This paper reports on investigations of the electrodialysis process for (NH~4~)~2~SO~4~ recovery from isoelectric supernatant pretreated by ceramic membrane.
RESULTS: For ceramic membrane pretreatment, the optimal pore size chosen was 0.2 µm. After a 250 min run, permeate flux was still maintained at 90 L m^−2^ h^−1^ (v = 2.8 m s^−1^, Δ__TMP__ = 0.12 MPa, concentration factor = 7). Meanwhile, the total solids and proteins content in condensed supernatant were high, up to 78 g L^−1^ and 24 g L^−1^, respectively, which greatly favors future cell protein harvest. With the chosen current density of 17 mA cm^−2^, the energy consumption and time for six consecutive batches for electrodialysis were 2.6–2.7 kW h kg^−1^ sulfate and ∼100 min, based on ∼80% ammonium sulfate recovery from pretreated isoelectric supernatant.
CONCLUSION: Ceramic membrane pretreatment was shown to be a promising pretreatment strategy, applicable to the electrodialysis process to recover ammonium sulfate from isoelectric supernatant produced during monosodium glutamate production. Copyright © 2008 Society of Chemical Industry