Liquid purification or separation – Recirculation – Serially connected distinct treating or storage units
Reexamination Certificate
1998-10-01
2001-01-23
Wyse, Thomas G. (Department: 1724)
Liquid purification or separation
Recirculation
Serially connected distinct treating or storage units
C210S605000, C210S903000, C210S906000
Reexamination Certificate
active
06177007
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates, in general, to a sewage treatment apparatus for purifying wastewater such as sewage and, more particularly, to a high efficiency apparatus for treating nitrogen and phosphorus contained in sewage in case of very low concentration of substrate contained in influent.
2. Description of the Prior Art
In a conventional sewage treatment apparatus, it is impossible to obtain a condition suitable for sewage treatment when sewage in low in concentration or temperature. As a result, loss of sludge occurs in an anaerobic tank equipped in such a conventional sewage treatment apparatus. In addition, the conventional sewage treatment apparatus is typically configured to directly introduce wastewater into the anaerobic tank. However, this configuration accelerates the sludge wash-out in the anaerobic tank, which lowers the removal efficiency of nitrogen and phosphorus.
SUMMARY OF THE INVENTION
Therefore, it is an objective of the present invention to overcome the problems encountered in prior arts and to provide a high efficiency apparatus for treating nitrogen and phosphorus contained in sewage, which can prevent sludge wash-out by steadily providing sludge to a sludge denitrification tank which, then, serves as a sludge reservoir to remove nitrate nitrogen of return sludge by endogeneous denitrification.
Based on the intensive and thorough research by the present inventor, the above objective could be accomplished by a provision of a high efficiency apparatus for treating nitrogen and phosphorus contained in sewage, comprising: a treating tank including a sludge denitrification tank, an anaerobic tanks, a plurality of anoxic tanks and a plurality of aerobic tanks which communicate sequentially with one another; a final settling tank for storing sewage fed from the last aerobic tank; a sewage influent unit arranged between a primary settling tank and the anaerobic tank; an internal recycle unit for denitrifying nitrated materials, the internal recycle unit being arranged between the last aerobic tank and the last one of the anoxic tanks; and a sludge returning unit arranged between the final settling tank and the sludge denitrification tank.
REFERENCES:
patent: 4867883 (1989-09-01), Daigger et al.
patent: 5022993 (1991-06-01), Williamson
patent: 5252214 (1993-10-01), Lorenz et al.
patent: 5651891 (1997-07-01), Molot et al.
Chang Yun Seok
Heo Yong Rok
Lee Eui Shin
Park Chil Lim
Park Myung Gyun
Daewoo Corporation
Darby & Darby
Wyse Thomas G.
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