Affiliation(s)
1. Department of Environmental Engineering, the University of Natural Resources and Environment, Ho Chi Minh City 00848, Vietnam
2. Department of Environmental Engineering, the Wageningen University, Wageningen 6708 PB, The Netherlands
ABSTRACT
The textile processing plants utilize a wide variety of dyes and other
chemicals such as acids, bases, salts, detergents, sizes, oxidants, mercerizing
and finishing chemicals. Many of these are not retained in the final product
and are discharged in the effluent. Therefore, the objective of this study was
to assess the performance of EGSB (Expanded Granular Sludge Bed) reactor to
treat non-acidifie wastewater. Several experiments using starch and volatile
fatty acids as model substrates were conducted. The problems of piston
formation were evaluated at a
variety of relevant operational conditions, such as substrate concentration,
organic and hydraulic loading rates. The results showed that newly grown
acidogenic biomass diluted original methanogenic biomass and the granular
sludge in the EGSB reactor deteriorated. The piston formation in the EGSB
reactor that was fed with non-acidified wastewater occurred due to high growth
of acidogenic biomass and high upflow velocity applied in the system. tion), AMO (Atlantic Multi-decadal Oscillation) and
AAO (Antarctic Oscillation) are respectively 24.30%, 26.23% and 21.92%, being only about 1/3 of the
urbanization-related variance. Panel data analysis of county-level total population
and annual average visibility days less than 10 km also show that these two
indicators have significant correlation with decadal HRA, HRD & HRI and the
spatial correlation coefficient increases gradually with time. These consistent
temporal and spatial features strongly suggest that rapid urbanization most
likely triggered the steady increase of heavy rainfall over China during the
recent decades.
KEYWORDS
Non-acidified
wastewater, starch wastewater, EGSB (Expanded Granular Sludge Bed).
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