1. Sludge-derived biochar improves sludge electro-dewatering performance: Conductivity analysis.
- Author
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Yang, Yahong, Ma, Pengjin, Li, Yangying, Chen, Yirong, and Zhang, Huining
- Subjects
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CARBON-based materials , *CHARGE exchange , *RAMAN spectroscopy , *X-ray diffraction , *BIOCHAR - Abstract
The application of Coupled Electro-dewatering (EDW) with Carbon Materials has demonstrated significant potential in the efficient deep dewatering and solid-liquid separation of activated sludge. In this study, Fe-loaded sludge-based biochar (SBB) was synthesized via FeCl 3 impregnation, and the physicochemical properties of SBB were comprehensively characterized using XRD, Raman spectroscopy, BET analysis, FTIR, and XPS. The results demonstrated that the elevation of pyrolysis temperature facilitated the formation of graphitic carbon and graphitic nitrogen structures within the SBB, thereby augmenting current transport in the solid phase of the sludge. Meanwhile, the Fe material present on the surface of SBB undergoes dissolution in the sludge supernatant, thereby releasing Fe ions into the liquid phase and augmenting the conductivity of the liquid system. After the addition of SBB, the sludge showed an increase in Zeta potential and conductivity, along with a pH shift towards acidity, thus improving the conditions for EDW processes. The results obtained from the EDW analysis demonstrated that the application of SBB@800 significantly contributed to the enhancement of both initial current and dewatering limit, leading to a notable reduction in sludge water content from 57.2 % to 40.7 %. This study emphasizes the influence of temperature on physicochemical properties of SBB and its role in EDW, proposing an environmentally friendly approach for advanced sludge treatment using carbon materials and EDW synergy while providing insights for designing carbon materials to enhance EDW performance. [Display omitted] [ABSTRACT FROM AUTHOR]
- Published
- 2024
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