Liquid purification or separation – Processes – Using magnetic force
Reexamination Certificate
2000-07-18
2002-11-19
Hruskoci, Peter A. (Department: 1724)
Liquid purification or separation
Processes
Using magnetic force
C204S155000, C204S252000, C204S272000, C204S293000, C205S701000, C205S746000, C205S752000, C210S719000, C210S721000, C210S738000, C210S748080, C210S760000, C210S764000, C210S173000, C210S192000, C210S205000, C210S223000, C210S903000, C210S906000, C210S916000
Reexamination Certificate
active
06482327
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a liquid treating process and apparatus as well as a liquid treating system, and particularly, to a liquid treating process and apparatus as well as a liquid treating system which are suitable for purifying not only waters in a river, a lake and a marsh, but also a high-concentration drainage such as a stock farming drainage and an industrial drainage, and another liquid containing water-soluble organic substances and micro-organisms.
BACKGROUNG OF THE INVENTION
There are conventionally proposed processes and systems for purifying a stock farming drainage containing feces and urine of cattle, pig and the like, or an industrial drainage containing chemical substances such as a detergent and an industrial waste liquid.
Such a conventional liquid treating system will be described below with the treatment of a pig-culture drainage taken as an example. As shown in
FIG. 28
, the conventional water treating system for treating the pig-culture drainage comprises a filtering means
131
for removing suspended solids by passing a raw water through a screen
135
or the like, a activated-sludge treating means
132
for decomposing water-soluble organic substances by aerobic bacteria, a settling/separating means
133
for settling the water-soluble organic substances separated from raw water by the decomposition to separate the water and a sediment from each other, and a dehydrating means
134
for removing water from the sediment.
These treating means will be described below in detail. In the filtering means
131
, the suspended solids are caught by the screen
135
during passage of the raw water containing the suspended solids such as feces and urine through the screen
135
. The raw water depleted of the suspended solids is once stored in a storage tank
136
and then transferred to a metering tank
137
, from which an amount of the water capable of being treated by an activated sludge is allowed to flow into an activated-sludge treating tank
138
as the activated-sludge treating means
132
. In the activated-sludge treating tank
138
, aerobic bacteria decompose the water-soluble organic substances such as a nitrogen compounds contained in the raw water. The raw water subjected to the decomposition by the bacteria in this treating means is fed to a settling tank
139
as the settling-separating means
133
, where the water-soluble organic substances and the like are settled to the bottom of the settling tank
139
and separated from the water. The resulting water is disinfected and then discharged to a river or the like, and the sediment is transported to the dehydrating means
134
, where the sediment is dehydrated into a solid by a dehydrator
140
and then discharged.
In the conventional water treating system, a washing water from the dehydrator
140
is permitted to flow into the storage tank
136
in order to avoid increases in building site and cost due to an increase in size of the activated-sludge treating tank
138
.
Therefore the so-called high-concentration raw water having a high organic substance load is diluted by the washing water from the dehydrator
140
and hence, the burden of the aerobic bacteria for decomposing the organic substances in the activated-sludge treating means
132
is alleviated.
However, the conventional water treating system suffers from the following problem: The high-concentration raw water cannot be diluted sufficiently by only the washing water from the dehydrator
140
, and a more amount of water is required. If the amount of water diluting the raw water is increased, the amount of water to be purified is also increased. As a result, the size of the water treating equipment is increased, thereby causing increases in initial cost such as building cost, and in running cost such as consumed electric power and city water charges for treating the liquid.
In addition, when a high-concentration sewage is treated biologically, it is difficult to conduct the maintenance and management, and if the treating system is once fallen into disorder, several months are required for the recovery. During this period, the water purified incompletely is discharged into a river, resulting in a possibility that an environment pollution problem is arisen.
To solve such problem, a treating process has been proposed which comprises chemically flocculating and separating high-molecular organic substances in water using a chemical agent such as a high-molecular flocculating agent or the like to reduce the concentration. However, this process suffers from a problem that it is delicate to set the type of the chemical agent and the amount of chemical thrown relative to the concentration of the organic substances, and it is difficult to change the type and the amount in accordance with a variation in concentration. Another problem is that if the remaining agent is incorporated into the activated-sludge treating tank, the microorganisms cannot be decomposed effectively and may be died out.
Further, there is a proposed process which involves decomposing organic substances using anaerobic microorganisms in place of the aerobic microorganism. However, this process suffers from a problem that a raw water must be stored for a long period in a large-sized tank and for this reason, a very wide site is required, and an odor measure must be taken.
SUMMARY OF THE INVENTION
The present invention has been accomplished with such problems in view, and it is an object of the present invention to provide a liquid treating process and apparatus as well as a liquid treating system, wherein the size of the liquid treating equipment can be reduced to reduce the initial cost and the running cost, and water-soluble organic substances, microorganisms and the like in a liquid can be reliably removed by a simple operation, and moreover, the deodorizing, decolorizing, sterilizing, disintegrating, and oxidizing and reducing treatments of the liquid can be carried out.
To achieve the above object, according to a first aspect and feature of the present invention, there is provided a liquid treating process comprising the steps of emitting an electromagnetic wave such as a microwave to a liquid containing colloidal particles of water-soluble organic substances, microorganisms and the like to separate the liquid into the colloidal particles and liquid molecules, emitting an ultrasonic wave in a low frequency range to the liquid resulting from the separation to flocculate the colloidal particles, and emitting an electromagnetic ultrasonic wave in a high frequency range to the liquid to deodorize the liquid.
The term “electromagnetic ultrasonic wave” used herein is defined to represent a wave made by synthesis of a magnetic flux generated by a permanent magnet or an electromagnet with an ultrasonic wave generated by a ultrasonic wave generator. The term “colloidal particles” used herein is defined to represent fine particles of water-soluble organic substances dispersed in the liquid, and particles of substances other than the liquid molecules such as microorganisms and fine algae. The particles are in stable hydrated states or in meta-stable hydrophobic colloidal states in the liquid.
With such process employed, the electric field formed by the microwave renders hydrophobic the colloidal particles in stable hydrated states or in meta-stable hydrophobic colloidal states in the liquid to separate them from the liquid molecules. The ultrasonic wave in the low frequency range causes the separated colloidal particles to collide against one another by a cavitation effect, thereby flocculating the colloidal particles, and the electromagnetic ultrasonic wave in the high frequency range deodorizes the liquid. Therefore, it is possible to easily and reliably remove the colloidal particles dissolved in the liquid and to deodorize the liquid without need for a large-scaled equipment.
In addition, according to a second aspect and feature of the present invention in addition to the first feature, the ultrasonic wave in the low frequency range has a frequency equal
Mori Toshikazu
Tsuda Mitsuo
Hruskoci Peter A.
Koda & Androlia
Proudo Co., Ltd.
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