标题: Enhanced sludge dewaterability by Fe-rich biochar activating hydrogen peroxide: Co-hydrothermal red mud and reed straw

作者: Li, H (Li, He); Dai, TL (Dai, Tenglong); Chen, JA (Chen, Jiaao); Chen, L (Chen, Lei); Li, YX (Li, Yixin); Kan, XQ (Kan, Xiaoqing); Hou, HB (Hou, Haobo); Han, Y (Han, Yi)

来源出版物: JOURNAL OF ENVIRONMENTAL MANAGEMENT 卷: 296 文献号: 113239 DOI: 10.1016/j.jenvman.2021.113239 出版年: OCT 15 2021

摘要: This study proposed Fe-rich biochar (RMRS-BC) produced by the co-hydrothermal treatment of red mud and reed straw, industrial waste and agricultural waste, as a novel sludge conditioner. It had been proven that hetero-geneous and homogeneous Fenton reactions occurred during the sludge conditioning process, in which RMRS-BC activated H2O2 to improve sludge dewaterability. Results demonstrated that the optimal condition was 7.5 wt% dry solids (DS) of RMRS-BC at a mass ratio of 1:1 combined with H2O2. The corresponding water content of sludge cakes and the capillary suction time reduction efficiency were 57.88 wt% and 69.76%, respectively. The Fe3O4 supported in the RMRS-BC structure was used as a catalyst to produce heterogeneous reaction, and the Fe2+ leached from the RMRS-BC after acidification happened homogeneous reaction. Double Fenton reaction in sludge conditioning enhanced the production efficiency of center dot OH, the sludge flocs were dispersed into smaller particles, more bound water from the extracellular polymeric substances (EPS) was released, and sludge dew-aterability performance was improved. Another main mechanism for enhancing dewaterability was to use RMRS-BC as a skeleton builder to reduce the compressibility of sludge cakes and facilitated free water to flow out. In summary, the Fenton oxidation method activated by RMRS-BC is feasible in improving sludge dewatering.

入藏号: WOS:000685499100009

PubMed ID: 34252849

语言: English

文献类型: Article

作者关键词: Fe-rich biochar; Sludge dewatering; Heterogeneous fenton reaction; Homogeneous fenton reaction; Extracellular polymeric substances

地址: [Li, He; Dai, Tenglong; Chen, Jiaao; Chen, Lei; Li, Yixin; Kan, Xiaoqing; Hou, Haobo; Han, Yi] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Hubei, Peoples R China.

[Hou, Haobo] Zhaoqing Wuhan Univ, Environm Technol Res Inst, Zhaoqing 526200, Guangdong, Peoples R China.

[Han, Yi] Anqing Normal Univ, Coll Resources & Environm, Anqing 246011, Anhui, Peoples R China.

通讯作者地址: Hou, HB; Han, Y (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Hubei, Peoples R China.

电子邮件地址: houhb@whu.edu.cn; yihan@whu.edu.cn

影响因子：6.789