Liquid purification or separation – Processes – Treatment by living organism
Reexamination Certificate
2011-07-12
2011-07-12
Prince, Fred (Department: 1776)
Liquid purification or separation
Processes
Treatment by living organism
C210S631000, C210S259000
Reexamination Certificate
active
07976707
ABSTRACT:
In treating organic-containing wastewater by a biological treatment in a stage prior to a advanced treatment such as membrane separation or the like, the amount of the biological metabolites produced in the biological treatment step is reduced to reduce the amount of the organic substances flowing into the advanced treatment step in a latter stage, thereby making the advanced treatment stable and efficient and efficiently recovering treated water of high quality. Water anaerobically biologically treated in an anaerobic reaction tank11including an acid production tank11A and a UASB reaction tank11B is subjected to a coagulation treatment and then to solid-liquid separation in a No. 1 sedimentation tank14. The resultant separated water is aerobically biologically treated water is subjected to a coagulation treatment and then to solid-liquid separation in a No. 2 sedimentation tank24. Then, the resultant water is subjected to a membrane separation treatment in a RO membrane separator40as advanced treatment means. By performing anaerobic biological treatment, aerobic biological treatment, and solid-liquid separation prior to the advanced treatment means, organic substances can be sufficiently removed, and treatment by the advanced treatment means can be made stable and efficient.
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Taguchi Yoshimi
Tanaka Michiaki
Kanesaka Manabu
Kurita Water Industries Ltd.
Prince Fred
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