GRANULE-FORMING METHOD AND WASTE WATER TREATMENT METHOD

A granule-forming method using a semi-batch reaction tank, wherein: operation cycles of a first operation cycle for performing a biological treatment step at a first sludge load and after the first operation cycle, a second operation cycle for performing the biological treatment step at a second slu...

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Bibliographic Details
Main Authors HAMAMOTO, Aki, MATSUDA, Hatsuhiro, TOMITA, Masaaki, EGUCHI, Masahiro, MIYAKE, Masaki, HASEBE, Yoshiaki
Format Patent
LanguageEnglish
French
German
Published 01.04.2020
Subjects
CHEMISTRY
METALLURGY
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Summary:A granule-forming method using a semi-batch reaction tank, wherein: operation cycles of a first operation cycle for performing a biological treatment step at a first sludge load and after the first operation cycle, a second operation cycle for performing the biological treatment step at a second sludge load are performed repeatedly; the first sludge load is set so that the soluble BOD concentration in the semi-batch reaction tank at the time of completion of the biological treatment step of the first operation cycle does not decrease to a threshold value or less; and the second sludge load is set so that the soluble BOD concentration in the semi-batch reaction tank at the time of completion of the biological treatment step of the second operation cycle is at or below the threshold value.
Bibliography:Application Number: EP20160885147