Reduction of alkali supplement in a pilot-scale thermophilic multi-staged UASB reactor treating alcohol distillery wastewater
International Journal of Environmental Research. 2013; 7 (4): 823-830
in English
| IMEMR
| ID: emr-138315
ABSTRACT
One of the main disadvantages of anaerobic wastewater treatment at a low pH is the significant operational cost due to the addition of necessary alkali. To reduce alkali supplement and thus the cost, this study proposes a sequential multi-feed [SqMF] mode [distributed feeding] and effluent recycle [ER] mode. Experiments were conducted with a pilot-scale [2.5 m[3]] thermophilic [55°C] multi-staged up-flow anaerobic sludge blanket reactor. Alcohol distillery wastewater [shochu], a major source of industrial wastewater in Japan, was used for the study. The SqMF mode of operation [influent pH 5.0; organic loading rate 45 kgCOD/m[3]/day; HRT 12 hours; influent COD concentration 20,900 mgCOD/L] successfully reduced the alkali supplement [24% NaOH solution] requirement by 67.2% compared with the single-feed mode. For the ER mode operation [organic loading rate 35 kgCOD/m[3]/day; HRT 12 hours; influent COD concentration 17,400 mgCOD/L], operation was possible without any alkali supplement since the system uses the alkalinity generated during microbial metabolism
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Index:
IMEMR (Eastern Mediterranean)
Main subject:
Waste Disposal, Fluid
/
Alcohols
/
Alkalies
/
Wastewater
Language:
English
Journal:
Int. J. Environ. Res.
Year:
2013
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