期刊
WATER RESEARCH
卷 205, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2021.117671
关键词
Organic saline wastewater; Anaerobic biological treatment; Anaerobic salt-tolerant flora; Model for salt-tolerant microorganisms; Spiral symmetry stream anaerobic bioreactor
资金
- Shanghai Pujiang Program [2020PJD001]
- Graduate Student Innovation and Entrepreneurship Ability Cultivation Program of Donghua University [DHUYJSCY21003]
In this study, a Spiral Symmetry Stream Anaerobic Bioreactor (SSSAB) was used to treat actual saline heparin sodium pharmaceutical wastewater (HSPW), achieving a COD removal rate of 82%, higher than other reactors at similar salinity. The main organic compounds in HSPW are benzenes, with the degradations of phenol and p-cresol as the major rate-limiting steps. The microbial community in anaerobic granular sludge (AGS) adapted to the HSPW treatment, demonstrating the superiority of the SSSAB structure.
In this study, a Spiral Symmetry Stream Anaerobic Bioreactor (SSSAB) was adopted for treating actual saline heparin sodium pharmaceutical wastewater (HSPW). After adaptation, under the influent COD of 8731 mg/L, OLR of 6.98 kg COD/(m3 center dot d) and salinity of 3.57 wt%, the COD removal reached up to 82%. This value is much higher than the reported for the other reactors at similar salinity. Benzenes are the major organic compounds in HSPW. The main rate-limiting steps are the degradations of phenol and p-cresol. In addition, the degradation pathways of typical benzenes in HSPW were analyzed. After adaptation, the soluble salt content in the granular sludge increased, and the bacterial extracellular polymers (EPS), especially tightly-bound EPS also significantly increased. 16S rRNA analysis revealed that the microbial community in the anaerobic granular sludge (AGS) had become adapted to the HSPW treatment since Mesotoga (12.4%), Anaerophaga (9.0%), Oceanotoga (6.1%) and Aminobacterium (4.1%) increased from previously below 1.0% values. The relative abundance of Methanosarcina in the upper layer of the reactor (68.7%) is significantly higher than that at the bottom (3.8%). This proves the superiority of the SSSAB structure. Finally, a model for salt-tolerant microorganisms is given, which proposes a mechanism for this study and provides reference for other anaerobic biological treatments of high-salt containing wastewater.
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