In:
Environmental Engineering Research, Korean Society of Environmental Engineering, Vol. 25, No. 5 ( 2019-09-16), p. 659-667
Abstract:
This study investigated the biological treatment of high-salinity wastewater using aerobic granular sludge (AGS). The removal performance, AGS characteristics, and microbial community were examined under salinity conditions ranging from 0.5 to 3.0 wt.%. When the salinity was increased, the removal efficiency of the chemical oxygen demand did not change substantially. The mean removal efficiency of NH 〈 sub 〉 4 〈 /sub 〉 〈 sup 〉 + 〈 /sup 〉 -N ranged from 43.7 to 72.6% during the operation period. As for the concentration of extracellular polymeric substances (EPS), the polysaccharide/protein (PS/PN) ratio increased from 0.37 to 0.57. The concentrations of the mixed liquor suspended solid (MLSS) and mixed liquor volatile suspended solid (MLVSS) were 4,560 and 3,170 mg/L, respectively, in the end phase, and the MLVSS/MLSS ratio decreased from 0.81 to 0.69. The sludge volume index (SVI 〈 sub 〉 30 〈 /sub 〉 ) decreased linearly from 88 to 58 mL/g. In the microbial community analysis, 〈 i 〉 Nitrosomonas 〈 /i 〉 species accounted for 22.9% of the total bacteria in the initial phase, whereas 〈 i 〉 Halomonas 〈 /i 〉 accounted for 43.2% in the end phase. Hence, the gradually increased salinity appears to facilitate the dominance of halophilic microorganisms in the long-term operation of an AGS-based biological treatment system and the stable retention of AGS.
Type of Medium:
Online Resource
ISSN:
1226-1025
,
2005-968X
DOI:
10.4491/eer.2019.233
Language:
English
Publisher:
Korean Society of Environmental Engineering
Publication Date:
2019
detail.hit.zdb_id:
2976690-4
Permalink
