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Influence of the organic loading rate on the performance and the granular sludge characteristics of an EGSB reactor used for treating traditional Chinese medicine wastewater.
Environ Sci Pollut Res Int. 2014; 21(13):8167-75.ES

Abstract

The effects of the organic loading rate (OLR) on the performance and the granular sludge characteristics of an expanded granular sludge bed (EGSB) reactor used for treating real traditional Chinese medicine (TCM) wastewater were investigated. Over 90% of the COD removal by the EGSB reactor was observed at the OLRs of 4 to 13 kg COD/(m(3) day). However, increasing the OLR to 20 kg COD/(m(3) day) by reducing the hydraulic retention time (HRT 6 h) reduced the COD removal efficiency to 78%. The volatile fatty acid (VFA) concentration was 512.22 mg/L, resulting in an accumulation of VFAs, and propionic acid was the main acidification product, accounting for 66.51% of the total VFAs. When the OLR increased from 10 to 20 kg COD/(m(3) day), the average size of the granule sludge decreased from 469 to 258 μm. There was an obvious reduction in the concentration of Ca(2+) and Mg(2+) in the granular sludge. The visible humic acid-like peak was identified in the three-dimensional excitation-emission matrix (EEM) fluorescence spectra of the soluble microbial products (SMPs). The fatty acid bond, amide II bond, amide III bond, and C-H bond bending were also observed in the Fourier transform infrared (FTIR) spectra of the SMPs. Methanobacterium formicicum, Methanococcus, and Bacteria populations exhibited significant shifts, and these changes were accompanied by an increase in VFA production. The results indicated that a short HRT and high OLR in the EGSB reactor caused the accumulation of polysaccharides, protein, and VFAs, thereby inhibiting the activity of methanogenic bacteria and causing granular sludge corruption.

Authors+Show Affiliations

School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, People's Republic of China, hitlwg@126.com.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24677060

Citation

Li, Weiguang, et al. "Influence of the Organic Loading Rate On the Performance and the Granular Sludge Characteristics of an EGSB Reactor Used for Treating Traditional Chinese Medicine Wastewater." Environmental Science and Pollution Research International, vol. 21, no. 13, 2014, pp. 8167-75.
Li W, Su C, Liu X, et al. Influence of the organic loading rate on the performance and the granular sludge characteristics of an EGSB reactor used for treating traditional Chinese medicine wastewater. Environ Sci Pollut Res Int. 2014;21(13):8167-75.
Li, W., Su, C., Liu, X., & Zhang, L. (2014). Influence of the organic loading rate on the performance and the granular sludge characteristics of an EGSB reactor used for treating traditional Chinese medicine wastewater. Environmental Science and Pollution Research International, 21(13), 8167-75. https://doi.org/10.1007/s11356-014-2709-y
Li W, et al. Influence of the Organic Loading Rate On the Performance and the Granular Sludge Characteristics of an EGSB Reactor Used for Treating Traditional Chinese Medicine Wastewater. Environ Sci Pollut Res Int. 2014;21(13):8167-75. PubMed PMID: 24677060.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of the organic loading rate on the performance and the granular sludge characteristics of an EGSB reactor used for treating traditional Chinese medicine wastewater. AU - Li,Weiguang, AU - Su,Chengyuan, AU - Liu,Xingzhe, AU - Zhang,Lei, Y1 - 2014/03/28/ PY - 2013/12/14/received PY - 2014/02/27/accepted PY - 2014/3/29/entrez PY - 2014/3/29/pubmed PY - 2015/5/15/medline SP - 8167 EP - 75 JF - Environmental science and pollution research international JO - Environ Sci Pollut Res Int VL - 21 IS - 13 N2 - The effects of the organic loading rate (OLR) on the performance and the granular sludge characteristics of an expanded granular sludge bed (EGSB) reactor used for treating real traditional Chinese medicine (TCM) wastewater were investigated. Over 90% of the COD removal by the EGSB reactor was observed at the OLRs of 4 to 13 kg COD/(m(3) day). However, increasing the OLR to 20 kg COD/(m(3) day) by reducing the hydraulic retention time (HRT 6 h) reduced the COD removal efficiency to 78%. The volatile fatty acid (VFA) concentration was 512.22 mg/L, resulting in an accumulation of VFAs, and propionic acid was the main acidification product, accounting for 66.51% of the total VFAs. When the OLR increased from 10 to 20 kg COD/(m(3) day), the average size of the granule sludge decreased from 469 to 258 μm. There was an obvious reduction in the concentration of Ca(2+) and Mg(2+) in the granular sludge. The visible humic acid-like peak was identified in the three-dimensional excitation-emission matrix (EEM) fluorescence spectra of the soluble microbial products (SMPs). The fatty acid bond, amide II bond, amide III bond, and C-H bond bending were also observed in the Fourier transform infrared (FTIR) spectra of the SMPs. Methanobacterium formicicum, Methanococcus, and Bacteria populations exhibited significant shifts, and these changes were accompanied by an increase in VFA production. The results indicated that a short HRT and high OLR in the EGSB reactor caused the accumulation of polysaccharides, protein, and VFAs, thereby inhibiting the activity of methanogenic bacteria and causing granular sludge corruption. SN - 1614-7499 UR - https://www.unboundmedicine.com/medline/citation/24677060/Influence_of_the_organic_loading_rate_on_the_performance_and_the_granular_sludge_characteristics_of_an_EGSB_reactor_used_for_treating_traditional_Chinese_medicine_wastewater_ L2 - https://dx.doi.org/10.1007/s11356-014-2709-y DB - PRIME DP - Unbound Medicine ER -