GRANULE-FORMING METHOD AND WASTE WATER TREATMENT METHOD

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...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: HAMAMOTO, Aki, MATSUDA, Hatsuhiro, TOMITA, Masaaki, EGUCHI, Masahiro, MIYAKE, Masaki, HASEBE, Yoshiaki
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
CHEMISTRY
METALLURGY
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Zusammenfassung: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.