Abstract
This study implements temporal and spatial appraisals on the operational performance and corresponding microbial community structure of a full-scale advanced anaerobic expanded granular sludge bed (AnaEG) which was used to treat low organic loading starch processing wastewater. Results showed stable treatment efficiency could be maintained with long-term erratic influent quality, and a major reaction zone located at the bottom of the AnaEG, where the main pollutant removal rate was greater than 90%. Remarkably, high-throughput sequencing of 16S rRNA gene amplicons displayed that the predominant members constructed the major part of the overall microbial community and showed highly temporal stability. They were affiliated to Chloroflexi (16.4%), Proteobacteria (14.01%), Firmicutes (8.76%), Bacteroidetes (7.85%), Cloacimonetes (3.21%), Ignavibacteriae (1.80%), Synergistetes (1.11%), Thermotogae (0.98%), and Euryarchaeota (3.18%). This part of microorganism implemented the long-term stable treatment efficiency of the reactor. Simultaneously, an extraordinary spatial homogeneity in the granule physic properties and microbial community structure along the vertical direction was observed within the AnaEG. In conclusion, the microbial community structure and the bioreactor’s performance showed notable spatial and temporal consistency, and the predominant populations guaranteed a long-term favorable treatment performance of the AnaEG. It provides us with a better understanding of the mechanism of this recently proposed anaerobic reactor which was used in low organic loading wastewater treatment.
Highlights
Starch serves as the important source for humans and industrial production, it is used extensively around the world (Avancini et al, 2007)
An advanced anaerobic expanded granular sludge bed (AnaEG) which combines the advantages of upflow anaerobic sludge blanket (UASB) and EGSB technology was invented by Li et al (2014)
The AnaEG had been efficiently operated for treating low organic loading wastewater in labscale experiment (0.806 kg chemical oxygen demand (COD) m−3 d−1; Li et al, 2014), and has been implemented in various industrial wastewater treatment, including starch processing wastewater (SPW), ethanol wastewater, pharmaceutical and chemical wastewater
Summary
Starch serves as the important source for humans and industrial production, it is used extensively around the world (Avancini et al, 2007). Numerous methods are applied for SPW treatment, especially, anaerobic biological treatment is the enormously popular one because of its many advantages Such as high organic loading rate (OLR), low energy consumption, and renewable energy production. An advanced anaerobic expanded granular sludge bed (AnaEG) which combines the advantages of UASB and EGSB technology was invented by Li et al (2014). In this new type reactor, the effluent does not need to be recycled back to the influent to maintain a high upward velocity. It might represent a new generation of anaerobic wastewater treatment processes
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