Abstract
Soy sauce wastewater has been produced in soy sauce production and consumption. To reuse this kind of water resource, the chemical oxygen demand (COD), colority should be removed or lowered. Biomimetic dynamic membrane (BDM), GO&Laccase@UF membrane, was prepared by filtering mixture of graphene oxide (GO) and laccase through ultrafiltration (UF) membrane. Compared to UF membrane, the prepared BDM showed great performance in removal of COD and colority, due to the higher laccase activity with existence of GO. The removal rate of colority reached ~80% by one step filtration operation. Moreover, the multiple cycle test evidenced that the value of COD and colority in the permeate after 5 consecutive cycles with the same GO&Laccase@UF membrane still meet the standard for reuse water. This work indicates the promising of BDM for wastewater from food industry.
Highlights
Soy sauce is an oriental fermented condiment consumed widely in Asian countries such as China, Thailand, Japan, and Korea
The characteristic peak of UF membrane from 700 cm-1 to 2000 cm-1 disappeared after modification with laccase and graphene oxide (GO), evidencing that the surface of UF membrane was effectively modified and covered by GO&Laccase layer
GO&Laccase@UF membrane showed large peaks of oxygen groups at 996 cm-1 and 3295 cm-1, representing the -C-O group and -O-H in both GO and laccase. These results evidenced the modification of the membrane surface
Summary
Soy sauce is an oriental fermented condiment consumed widely in Asian countries such as China, Thailand, Japan, and Korea. To prevent pollution and to recycle valuable resources of soy sauce wastewater, various researches were carried out to develop efficient and economic methods for soy sauce wastewater treatment and reusing (Hyun-Hee et al 2017, Battisti et al 2019). Hyun-Hee et al (2017) compared efficiency of three oxidation agent, Fenton (Fe2+), Fenton-like (Fe3+), and ozone (O3), to remove the color and lower the COD of soy sauce wastewater. The best color removal of 81.1% and COD lowering of 64.9% were obtained via O3 oxidation due to the degradation of organics caused by the large amount hydroxyl radical. The best color removal of 81.1% and COD lowering of 64.9% were obtained via O3 oxidation due to the degradation of organics caused by the large amount hydroxyl radical. Anam et al (2012) applied a marine photosynthetic bacterial consortium, An Acad Bras Cienc (2021) 93(Suppl. 3)
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