公开(公告)号：US20190023594A1

公开(公告)日：2019-01-24

申请号：US16069083

申请日：2016-12-28

Applicant: ORGANO CORPORATION

Inventor： Hatsuhiro MATSUDA ,  Masaaki TOMITA ,  Aki HAMAMOTO ,  Masaki MIYAKE ,  Yoshiaki HASEBE ,  Masahiro EGUCHI

IPC: C02F3/12

CPC classification number: C02F3/1263 ,  C02F3/00 ,  C02F3/10 ,  C02F3/12 ,  C02F2203/004 ,  C02F2209/08 ,  C02F2209/14 ,  Y02W10/15

Abstract: 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.