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An exploratory study on the aqueous Cr(VI) removal by the sulfate reducing sludge-based biochar
Separation and Purification Technology ( IF 8.6 ) Pub Date : 2021-07-21 , DOI: 10.1016/j.seppur.2021.119314
Rui Ma 1 , Xueqian Yan 1 , Xunchi Pu 2 , Xiaoying Fu 2 , Linqin Bai 1 , Yufei Du 1 , Minxian Cheng 1 , Jin Qian 1
Affiliation  

Biological sulfate reduction has been demonstrated to be a promising biotechnology for the sulfate-laden wastewater treatment. However, the excessive waste sulfate reducing sludge needs further disposal and treatment. In this study, the sulfate reducing sludge was firstly utilized as the raw materials and pyrolyzed at 500℃ under oxygen-limited condition for biochar (marked as SBC-500) fabrication. And the application of SBC-500 for Cr(VI) removal was explored herein. Meanwhile, the normal anaerobic sludge derived from anaerobic digester in a sewage treatment plant was also employed to produce biochar as the control (marked as BC-500). Batch experiments for Cr(VI) removal were performed under different biochar dosages, pH and initial Cr(VI) concentrations. The results indicated that the SBC-500 was superior to BC-500 in terms of pore volume and specific surface area as well as the Cr(VI) removal performance. The Cr(VI) removal efficiency by SBC-500 could achieve 97.31% within 24 hours (pH of 3.0, 0.5 g biochar dosage, 30 mg Cr(VI)/L). Langmuir isotherm model and pseudo-second-order kinetic model were determined to the Cr(VI) removal process. In the presence of SBC-500, the Cr(VI) in the aqueous phase was removed synergistically by the chemisorption with reduction of Cr(VI) to Cr(III). The SBC-500 still exhibited a satisfactory Cr(VI) removal with the efficiency of 91.98% after five cycles of adsorption-desorption. Thus, the results of this study may shed light on a new approach for simultaneous economical sulfate reducing sludge disposal and the sustainable remediation of the Cr(VI)-contaminated wastewater.



中文翻译:

硫酸盐还原污泥基生物炭去除水中六价铬的探索性研究

生物硫酸盐还原已被证明是一种用于处理含硫酸盐废水的有前途的生物技术。然而,过量的废硫酸盐还原污泥需要进一步处置和处理。本研究首先以硫酸盐还原污泥为原料,在500℃限氧条件下热解制备生物炭(标记为SBC-500)。并探讨了 SBC-500 在去除 Cr(VI) 中的应用。同时,还利用污水处理厂厌氧消化池产生的普通厌氧污泥生产生物炭作为对照(标记为BC-500)。在不同的生物炭剂量、pH 值和初始 Cr(VI) 浓度下进行了 Cr(VI) 去除的批量实验。结果表明,SBC-500 在孔体积和比表面积以及 Cr(VI) 去除性能方面优于 BC-500。SBC-500 对 Cr(VI) 的去除率在 24 小时内可达到 97.31%(pH 为 3.0,0.5 g 生物炭用量,30 mg Cr(VI)/L)。Langmuir等温线模型和准二级动力学模型被确定为Cr(VI)去除过程。在 SBC-500 存在下,水相中的 Cr(VI) 通过化学吸附协同去除 Cr(VI) 还原为 Cr(III)。SBC-500 在五次吸附-解吸循环后仍表现出令人满意的 Cr(VI) 去除率,效率为 91.98%。因此,

更新日期:2021-07-22
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