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- Title
Pretreatment of preserved fruits wastewater by a novel Fe(III)-catalyzed oxidation coupled with calcium oxide precipitation.
- Authors
Chongzhi Yao; Pingzhong Feng; Zhongbin Xu; Zhongming Wang; Tingting Zhu; Zhibing Li; Shunni Zhu
- Abstract
The high concentration of sulfite in preserved fruits wastewater is toxic to microorganisms, which tends to break down the biological treatment system and leads to poor effluent quality. In addition, the pH decreases constantly due to the presence of sulfite during biological treatment, even if it is repeatedly adjusted to neutral. Therefore, to ensure the stable and efficient operation of biological treatment, a novel pretreatment was proposed through transition metal ions catalyzed oxidation coupled with chemical precipitation. The results showed that Fe(III) ion achieved the best catalytic efficacy for the oxidation of sulfite which was attributed to the combination of complexation and free radical reaction. Under the optimal conditions (aeration rate = 0.10 L/min, Fe(III) dosage = 5 mmol/L), the sulfite removal was 80.1%, concomitant with 20.7% of chemical oxygen demand (COD) removal. Further, by calcium oxide precipitation, the sulfite was completely removed, COD decreased by 32.2% as well as BOD5 /COD increased to 0.96, ensuring pH stability and high biodegradability in subsequent biological treatments. These findings demonstrate that this pretreatment process has great potential for sulfite removal and provides an economical and practical approach to the treatment of preserved fruits wastewater.
- Subjects
LIME (Minerals); FREE radical reactions; SEWAGE; TRANSITION metal ions; FRUIT
- Publication
Desalination & Water Treatment, 2023, Vol 293, p124
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2023.29524