Liquid purification or separation – Processes – Treatment by living organism
Reexamination Certificate
1999-06-21
2001-02-20
Barry, Chester T. (Department: 1724)
Liquid purification or separation
Processes
Treatment by living organism
Reexamination Certificate
active
06190553
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a water treatment system for treating polluted or waste water. More particularly, the present invention relates to a water treatment system using water plants, which treats the water that had been biologically treated in a conventional waste water treatment system that decomposes organic matters using water microbes, thereby eliminating nitrogen and phosphorus components existing in water. Further, the present invention relates to a method of purifying the water that had been biologically treated in a conventional waste water treatment system that decomposes organic matters using water microbes, thereby eliminating nitrogen and phosphorus components existing in water, of which purification is carried out in the plurality of water plant sections.
BACKGROUND OF THE INVENTION
In these days, various kinds of waste water and contaminated water contaminate the rivers and soils, and how to handle this problem has become a serious matter. The waste water discharged from the homes of urban areas and the waste water discharged from factories and other facilities are doubling their seriousness everyday. Particularly, schools, tenting open fields, hot springs, golf courses, factory areas, cattle feces treating facilities, livestock waste material treating facilities and the like discharge large volumes of waste water to contaminate the rivers and soils. Therefore, an effective treatment of this waste water has become an urgent problem.
In treating the waste water, the biological method has been widely utilized so far. In the biological treatment method, microbes are utilized to make the contaminants decomposed, thereby lowering the BOD (biological oxygen demand). Generally, the conventional biological treating facility includes: a storage tank for temporarily storing the incoming waste water; an aeration tank for decomposing the organic materials by utilizing microbes; a sedimentation tank for precipitating the sludge; and a final storage tank for temporarily storing the treated water.
The biologically treated water is made to flow away to rivers and the sea, or it is treated for the second time before it is discharged to the rivers and the sea. In the biologically treated water, the organic substances are mostly eliminated, but considerable amounts of nitrogen and phosphorus remain. The remaining nitrogen and phosphorus synthesize organic matters such as vegetable plankton and moss, with the result that the green water is generated.
In order to remove nitrogen and phosphorus from the biologically treated water, there have been attempted various methods, but none of them has been successful so far. One of the attempted methods is that in which a second treatment is carried out by employing a sand filtering and an active filtering. In this method, however, various disadvantages are accompanied such as a low treatment efficiency, a high operating and facility cost, and a fastidious operating technique. Therefore, this method could not be put to the practical use. In another method, special plants such as dropworts or the like are experimentally tried. For example, dropworts are planted in a wide wet field to make the dropworts absorb nitrogen or phosphorus components. Or other plants are planted for the same purpose. In this method, however, the treatment efficiency is low, and furthermore, these plants are withered to death in winter seasons. Thus this method has been proved to be not reliable.
In this context, the present inventor has developed a system which can be added to the biologically treating facility to remove the remaining nitrogen and phosphorus components.
OBJECTS OF THE INVENTION
An object of the invention is to provide a water-plants treatment system which can remove nitrogen and phosphorus components further from the water which had been treated by a conventional biological water treatment system.
Another object of the invention is to provide a water-plants treatment system which can be installed to the conventional biological water treatment system additionally or together.
A further object of the invention is to provide a water-plants treatment system which can remove untreated nitrogen and phosphorus components with an high efficiency from the water which had been treated by a conventional biological water treatment system.
A further object of the invention is to provide a water-plants treatment system which can operate during all four seasons as growing water-plants even in winter season using waste heat from the biological treatment system.
A further object of the invention is to provide a environmentally suitable water treatment system because nitrogen and phosphorus components are removed only by using water-plants, but not by any chemicals.
A further object of the invention is to provide a water-plants treatment system which is moderate in construction and operation cost, good in durability, and easy in operation management.
A further object of the invention is to provide a water-plants treatment system which can maximize its purification efficiency having slow filtering method and reverse flow washing.
Other objects and advantages of this invention will be apparent from the ensuing disclosure and appended claims.
SUMMARY OF THE INVENTION
The present invention provides a water plant treatment system
5
in which the nitrogen and phosphorus components and other contamination substances are removed from the water which has been treated biologically by the conventional system. The water plant treatment system
5
according to the present invention includes: a distribution section
51
for temporarily storing the incoming waste water to distribute it to the next stages; a first section
52
for filtering the waste water of the distribution section
51
by means of a filtering layer
104
a
, and for eliminating the nitrogen and phosphorus components by the water caltrops of the filtering layer
104
a
; a second section
53
with water hyacinths planted therein, for purifying the water coming from the first section
52
; a third section
54
with great duckweeds planted on the water surface thereof, for purifying the water coming from the second section, and for vaporizing the nitrogen gas into the external atmosphere based on the de-nitrogenizing reaction method; and a fourth section
55
with a filtering layer
104
b
disposed therein, for purifying the water coming from the third section, and with water caltrops planted therein, for eliminating the residual nitrogen and phosphorus components.
Thus according to the present invention, the water plant treatment system
5
is installed upon the conventional aeration tank
2
, and above the system
5
, the green house
22
is installed to cover the system
5
, so that the heat generated from the aeration tank
2
can be utilized. In the case where it cannot be installed upon it, the aeration tank
2
may be installed on the basement, while the water plant treatment system
5
may be installed on the top of the building. Thus the hot air from the aerationtank
2
can be transferred through an air ventilation pipe
23
to the water plant treatment system
5
to warm it up.
The filtering layer
104
of the water plant treatment system
5
is installed upon a distribution box
105
, and the filtering layer
104
consists of 6 layers. The first layer
201
contains pebbles having an average diameter of 30-60 mm, and the 6th layer contains sands having an average diameter of 0.2-0.45 mm.
The waste water is treated twice by the filtering layer
104
a
of the first section
52
and by the filtering layer
104
b
of the fourth section
55
. Therefore, the contaminants can be filtered completely. The water velocity during the passing through the filtering layer
104
is 5-30 m/day, thereby providing a slow filtering method.
If the contamination materials are accumulated within the filtering layer
104
, then the flow resistance is built up, with the result that the flow velocity is slowed down. Particularly, if the flow velocity through the filtering layer
104
a
of the first
Barry Chester T.
Dickinson Wright PLLC
Lee Sangeul
LandOfFree
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