制革废水中含铬有机物的生物吸附-矿化协同去除机制

doi:10.19677/j.issn.1004-7964.2023.01.002

皮革科学与工程 ›› 2023, Vol. 33 ›› Issue (1): 9-14.doi: 10.19677/j.issn.1004-7964.2023.01.002

制革废水中含铬有机物的生物吸附-矿化协同去除机制

党靖雯¹, 马宏瑞^1,*, 朱超¹, 徐芝芬¹, 周姣^1,2

1.陕西科技大学环境科学与工程学院,陕西西安 710021;
2.桂林理工大学环境科学与工程学院,广西桂林 541004

收稿日期:2021-05-26 出版日期:2023-02-01 上线日期:2023-01-04
通讯作者: *马宏瑞(1963-),男,教授,博士生导师,主要从事化工污染控制与资源化技术的研究。E-mail：mahr@sust.edu.cn。
作者简介:党靖雯（1997-）,女,硕士研究生。E-mail：793556748@qq.com。
基金资助:
国家自然科学基金项目(No.22076113)

Synergistic Removal Mechanism of Chromium-Containing Organic Compounds in Tannery Wastewater by the Cooperation of Biosorption and Mineralization

DANG Jingwen¹, MA Hongrui^1,*, ZHU Chao¹, XU Zhifen¹, ZHOU Jiao^1,2

1. College of Resource and Environment, Shaanxi University of Science & Technology, Xi’an 710021, China;
2. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China

Received:2021-05-26 Online:2023-02-01 Published:2023-01-04

摘要/Abstract

摘要： 制革含铬废水预处理后仍残留少量有机络合态铬,并以此形式进入生化处理,故活性污泥对有机络合态铬的吸附及破络行为值得关注。实际废水实验结果表明,好氧活性污泥在2 h内同步吸附化学需氧量（COD）和Cr(III),Cr(III)去除率达92.5%,但COD去除率不足15%。吸附前后活性污泥中有机络合态铬的分子粒径集中分布在2~3 nm和小于2 nm的区域,且吸附后仍残留少量有机络合态铬。随生化处理时间延长,Cr(III)逐渐进入微生物内部,低浓度Cr(III)促进微生物分泌胞外聚合物（EPS）,高浓度Cr(III)抑制EPS分泌。Cr(III)较多分布在松散附着型EPS和紧密黏附型EPS中,EPS上的-OH、C-O-C、C-OH和-COOH为Cr(III)提供吸附位点。该研究为制革废水铬排放总量控制及深度处理提供了理论依据。

关键词: 活性污泥, 络合态铬, 胞外聚合物, 吸附

Abstract: A small amount of organic complexed chromium compounds remain and then enter into the bio-treatment system after the pretreatment of chromium-containing tannery wastewater. Thus, it is of great significance to study the adsorption and de-complexing behavior of organic complexed chromium compounds by activated sludge. The bio-treatment results of actual wastewater show that the aerobic activated sludge could simultaneously adsorb chemical oxygen demand (COD) and Cr (III) within 2 h, and the removal rate of Cr(III) reached 92.5%, while the removal rate of COD was less than 15%. Before and after adsorption, the molecular particle size of organic complexed chromium in activated sludge was concentrated in the region of 2-3 nm and less than 2 nm, and a small amount of organic complexed chromium remained after adsorption. With the prolongation of biochemical treatment period, Cr (III) gradually entered to the interior of microorganisms. Cr(III) at low concentration could promote the secretion of extracellular polymeric substances (EPS) in microorganisms, while high concentration of Cr(III) could inhibit its secretion. Cr(III) was mostly located in tightly bound EPS and loosely bound, and functional groups such as -OH, C-O-C, C-OH, and -COOH on EPS could provide advantageous adsorption sites for Cr(III). This study provides a theoretical basis for the total control and advanced treatment of chromium-containing tannery wastewater.

Key words: activated sludge, complexed chromium, extracellular polymer, adsorption

中图分类号:

X52：TQ949

党靖雯, 马宏瑞, 朱超, 徐芝芬, 周姣. 制革废水中含铬有机物的生物吸附-矿化协同去除机制[J]. 皮革科学与工程, 2023, 33(1): 9-14.

DANG Jingwen, MA Hongrui, ZHU Chao, XU Zhifen, ZHOU Jiao. Synergistic Removal Mechanism of Chromium-Containing Organic Compounds in Tannery Wastewater by the Cooperation of Biosorption and Mineralization[J]. Leather Science and Engineering, 2023, 33(1): 9-14.

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制革废水中含铬有机物的生物吸附-矿化协同去除机制

Synergistic Removal Mechanism of Chromium-Containing Organic Compounds in Tannery Wastewater by the Cooperation of Biosorption and Mineralization

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