文章摘要
马蕊,吴耀国,张明宽,白琳嵚,闫雪倩,钱进.硫酸盐还原剩余污泥-生物炭制备及对 Cr(VI)去除性能[J].精细化工,2020,37(12):
硫酸盐还原剩余污泥-生物炭制备及对 Cr(VI)去除性能
Removal of Cr(VI) by sulfate reducing sludge-based biochar
投稿时间:2020-05-17  修订日期:2020-08-18
DOI:
中文关键词: 硫酸盐还原污泥  生物炭  吸附  Cr(Ⅵ)  污泥处置  水处理技术
英文关键词: sulfate reducing sludge (SRS)  biochar  adsorption  Cr(Ⅵ)  sludge disposal  water treatment technology
基金项目:中央高校基本科研业务费项目(3102019AX18; 310201911cx021)
作者单位E-mail
马蕊 西北工业大学 m18592017056@163.com 
吴耀国 西北工业大学  
张明宽 西北工业大学  
白琳嵚 西北工业大学  
闫雪倩 西北工业大学  
钱进 西北工业大学 qianjin@nwpu.edu.cn 
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中文摘要:
      以硫酸盐还原剩余污泥(sulfate reducing sludge, SRS)作为生物质原料,在500 ℃限氧条件下制备生物炭材料(SBC-500)。并以某污水处理厂污泥浓缩池中的厌氧污泥制备的生物炭(BC-500)作为对照,通过SEM、XRD、FTIR及BET对两种生物炭进行表征分析,并对比不同材料对Cr(Ⅵ)的去除能力。结果表明:相较于BC-500,SBC-500在产率、灰分及孔容方面具有优势,其BET比表面积为17.90 m2/g,明显大于BC-500(10.24 m2/g)。以SRS制备的SBC-500,其表面孔道结构明显,生物炭内部镶嵌有不规则边缘晶型结构,XRD观测到石墨烯碳、非晶型碳及FeS晶型结构存在,FTIR图谱出现O═S═O的反对称伸缩振动峰、S═O双键的特征吸收峰。在pH为3,投加量为0.2 g,Cr(Ⅵ)初始质量浓度为10 mg/L,吸附48 h后,SBC-500对Cr(Ⅵ)去除率达到100%,初始质量浓度增至200 mg/L时,SBC-500对Cr(Ⅵ)的吸附量为8.22 mg Cr(Ⅵ)/g,与BC-500相比,SBC-500对Cr(Ⅵ)具有更好的去除能力。该研究为剩余污泥实现资源化处置与受重金属污染水体修复提供新的理念与思路。
英文摘要:
      Sulfate reducing sludge (SRS) was employed as the raw biomass material and pyrolysed at 500oC under oxygen-limited condition, for the functional biochar preparation (i.e. SBC-500). With the anaerobic sludge (derived from sludge thickening tank in a sewage treatment plant)-based biochar (i.e. BC-500) as the control, both materials were characterized by SEM, XRD, FTIR and BET. The environmental application of them for Cr(Ⅵ) removal was also evaluated and compared. The results showed that the SBC-500 is superior to BC-500 in terms of biochar yield, ash content and pore volume. As for BET analysis, BETSBC-500 was 17.9 m2/g, significantly larger than BC-500 (10.24 m2/g). According to the SEM results, porous structure was clearly displayed in the surface of biochar. And irregular marginal crystal structure were embedded in the biochar. The presences of graphene carbon and FeS crystal and amorphous carbon were confirmed in SBC-500 via XRD analysis. The FTIR spectrum presented the anti-symmetric stretching peak of O═S═O and the characteristic absorption peak of S═O bond in the SBC-500. The Cr (Ⅵ) removal efficiency by SBC-500 (via adsorption and reduction) could achieve 100% after 48 hour’s reaction, at pH 3, 0.2 g dosage and Cr (Ⅵ) initial concentration of 10 mg/L. With the initial concentration increased to 200 mg/L, the adsorption capacity of Cr(Ⅵ) was 8.22 mg Cr(Ⅵ)/g by SBC-500. The results of this study may provide new concept and insight into the economical disposal of the surplus sludge and the effective remediation of heavy metal polluted water body.
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