reduction of alkali supplement in a pilot-scale thermophilic multi-staged uasb reactor treating alcohol distillery wastewater

نویسندگان

m. yamada

department of civil and environmental engineering, kagoshima national college of technology, 1460-1 shinko, hayato-cho, kirishima, kagoshima, 899-5193, japan h. harada

department of civil and environmental engineering, tohoku university, 6-6-06 aoba, aramaki, aoba ku, sendai, miyagi, 980-8579, japan m. yamauchi

department of civil and environmental engineering, kagoshima national college of technology, 1460-1 shinko, hayato-cho, kirishima, kagoshima, 899-5193, japan t. yamaguchi

department of civil and environmental engineering, nagaoka university of technology, 1603-1 kamitomiokamachi, nagaoka niigata, 940-2188, japan a. ohashi

چکیده

one of the main disadvantages of anaerobic wastewater treatment at a low ph is the significantoperational cost due to the addition of necessary alkali. to reduce alkali supplement and thus the cost, thisstudy proposes a sequential multi-feed (sqmf) mode (distributed feeding) and effluent recycle (er) mode.experiments were conducted with a pilot-scale (2.5 m3) thermophilic (55°c) multi-staged up-flow anaerobicsludge blanket reactor. alcohol distillery wastewater (shochu), a major source of industrial wastewater injapan, was used for the study. the sqmf mode of operation (influent ph: 5.0; organic loading rate: 45kgcod/m3/day; hrt: 12 hours; influent cod concentration: 20,900 mgcod/l) successfully reduced thealkali supplement (24% naoh solution) requirement by 67.2% compared with the single-feed mode. for theer mode operation (organic loading rate: 35 kgcod/m3/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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reduction of alkali supplement in a pilot-scale thermophilic multi-staged uasb reactor treating alcohol distillery wastewater

one of the main disadvantages of anaerobic wastewater treatment at a low ph is the significantoperational cost due to the addition of necessary alkali. to reduce alkali supplement and thus the cost, thisstudy proposes a sequential multi-feed (sqmf) mode (distributed feeding) and effluent recycle (er) mode.experiments were conducted with a pilot-scale (2.5 m3) thermophilic (55°c) multi-staged up...

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عنوان ژورنال:
international journal of environmental research

جلد ۷، شماره ۴، صفحات ۸۲۳-۸۳۰

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