Title:
TREATMENT OF NIGHT SOIL OR THE LIKE
Document Type and Number:
Japanese Patent JP3389832
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To increase the thermal efficiency and decomposition efficiency of an anaerobic digestion and to improve the quality of concentration separated water and digestion elimination water by adding an inorganic fluocculant into night soil and/or organic sludge, then adding an amphoteric high molecular fluocculant, stirring them to granulate and concentrate and anaerobically digesting the concentrated material.
SOLUTION: Night soil, septic tank sludge and surplus sludge are introduced into a fluocculation reaction tank, flocculated by at first adding an inorganic flocculant, stirring and then, adding an amophoteric polymer and, stirring and further, granulated by slowly stirring. The granulated sludge easily separates the water with a simply structured screen to concentrate the water and to digest anaerobically the water in an anaerabic digestion process 2. A digestion supernatant is introduced into an activated sludge process 3 together with the concentration separated water from the screen 5 to be treated with the activated sludge. Since the concentration separated water and the digestion supernatant have an excellent water quality and are particularly low in a COD, chromaticity and the concentration of phosphorus or the like, which are difficult to remove by an activated sludge process, the excellent treated water is obtained by the activated sludge treatment.
Inventors:
Kensuke Matsui
Ken Shibata
Shozo Nishikawa
Ken Shibata
Shozo Nishikawa
Application Number:
JP18502797A
Publication Date:
March 24, 2003
Filing Date:
July 10, 1997
Export Citation:
Assignee:
Kurita Water Industries Ltd.
International Classes:
C02F3/08; C02F1/52; C02F1/56; C02F3/28; C02F11/04; C02F11/14; (IPC1-7): C02F1/52; C02F1/56; C02F11/04; C02F11/14
Domestic Patent References:
| JP352700A | ||||
| JP4131199A | ||||
| JP7256298A |
Attorney, Agent or Firm:
Takeshi Shigeno