Abstract：
:Biochemical properties of granules are of vital importance to UASB performance. This study characterized the granules cultivated at different COD/SO42- ratios to elucidate the influence of sulfidogenesis on starch wastewater (1000 mg-COD L-1) biodegradation kinetics and process stability. Suitable sulfate addition enriched granular microecosystems and stimulated the secretion of extracellular substances, facilitating cells cohersion and sludge aggregation. The percentage of granules larger than 2.8 mm increased from <10.0% to 58.8-69.4% with decreasing COD/SO42- ratio from 10 to 2. Starch-fed granules tended to grow flagella-like filaments on the surface. The filaments overwhelmed by hydrophilic biopolymers had high affinity for biogas-bubbles and water-molecules aggravating granule floatation and washout. 16 s rRNA gene analysis revealed that decreasing COD/SO42- ratio shifted Syntrophobacterales to Desulfovibrio, which co-worked with Methanosaeta while suppressing Methanobacterium thereby altering starch bioconversion routes. Decrease in Syntrophobacterales caused propionate accumulation and slight process upset.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Lu X,Ni J,Zhen G,Kubota K,Li YYdoi
10.1016/j.biortech.2018.02.055subject
Has Abstractpub_date
2018-05-01 00:00:00pages
456-465eissn
0960-8524issn
1873-2976pii
S0960-8524(18)30248-7journal_volume
256pub_type
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