JPH105776A - Treating device of organic waste water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and sufficiently treat organic waste water with changing quantity and quality by providing a gas-liquid mixer for mixing the organic waste water with air in a flow rate adjusting tank or an aeration tank, in an organic waste water treating device provided with the flow rate adjusting tank, the aeration tank and a precipitation tank. SOLUTION: This device is provided with the flow rate adjusting tank 1 for performing 1st order storage of the organic discharge water, the aeration tank 2 for mixing the waste water fed from the flow rate adjusting tank 1 with air and being brought into contact with microorganisms, and the precipitation tank 3 for precipitating sludge of the discharge water fed from the aeration tank 2. The gas-liquid mixer 5 is provided on the flow rate adjusting tank 1, and this gas-liquid mixer 5 force-feeds oxygen into the discharge water sucked from the flow rate adjusting tank 1 and mixes with it, and then the discharge water is fed back to the flow rate adjusting tank 1. Thus, the discharge water incorporating a large quantity of oxygen, accelerates activation of microorganisms in the aeration tank 2. Also, the gas-liquid mixer 5 provided between a concentrating tank 4 and the aeration tank 2 activates microorganisms by mixing oxygen into the separated liquid sucked from the concentrating tank 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for treating water quality of wastewater, and more particularly, to an apparatus for treating organic wastewater discharged from human waste and food factories.

[0002]

2. Description of the Related Art In the case of treating human wastewater and organic wastewater discharged from food factories and the like, it is general that the wastewater is processed through, for example, the process shown in FIG. 3 and discharged into a river or the like. FIG. 3 will be described below. The flow rate adjusting tank 100 is a tank for storing raw water of wastewater discharged from a food factory or the like, and includes a pump for sending an amount of water according to the processing capacity of the subsequent process to the aeration tank. The aeration tank 101 mixes microorganisms and air (oxygen or the like) into the sent wastewater, and biologically treats the microorganisms in the wastewater. As a result, the organic matter in the wastewater can be reduced, but as a result, the microorganisms are enlarged and sludge is formed. Settling tank 10
2 is to sediment the enlarged microorganisms as sludge, and after a lapse of a predetermined time, discharge the supernatant to a river or the like,
The sludge is transported to the concentration tank 103 in the next step. Therefore, the sedimentation tank 102 is provided with a pump or a pipeline, and thereby transports the semi-liquid sludge to the concentration tank 103. The concentration tank 103 is provided with a device for filtering sludge, and separates sludge into solid and liquid. The separated solid is disposed of as industrial waste, and the liquid containing residual sludge is returned to the aeration tank 101 by a pump or the like and reprocessed.

[0003]

Here, it is known that the amount or quality of the organic wastewater discharged from night soil and food factories fluctuates greatly depending on the time of day, season, and the like, and is not constant throughout the year. Have been. Therefore, in designing the wastewater treatment device, if a large-scale treatment device is designed in accordance with the season when the amount of wastewater is large, it is not necessary to operate the device sufficiently in other seasons and the like, It is not appropriate from the economic point of installation cost and maintenance cost. On the other hand, if the treatment equipment is designed with the intention of an average amount of wastewater, the wastewater cannot be sufficiently treated when the amount of wastewater is excessive, and by discharging such treated wastewater to a river. Environmental pollution is unavoidable. However, the expansion and renovation of the processing equipment has a problem that the processing must be temporarily stopped and a large amount of cost is required.

[0004] As a countermeasure when the amount of wastewater exceeds the treatment capacity of the treatment apparatus, a method of introducing a flocculant into the sedimentation tank in the sedimentation step to promote coagulation and sedimentation of the sludge or the aeration tank In the step 101, there is a method of activating a microorganism by introducing a special agent such as an enzyme into an aeration tank. However, the above-mentioned drugs and the like are expensive and are not adapted to continuous input. Furthermore, according to the former method using a flocculant, the activation of microorganisms is significantly impaired, so that biological treatment is not suitably performed, and biological treatment is fatal in wastewater treatment, which is extremely important. However, there is also a problem that if the quantity and quality of the enzyme and the like are not adapted to the treated wastewater, a sufficient effect cannot be obtained, and thus further control of adjustment and the like is required. Was.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an organic wastewater treatment apparatus capable of sufficiently and economically treating wastewater whose quantity and quality fluctuate from time to time.

[0006]

According to the present invention, a flow regulating tank for temporarily storing organic waste water, and a predetermined amount of organic waste water are sent from the flow regulating tank, where air is mixed with microorganisms. An aeration tank for contacting with an aeration tank, and a sedimentation tank for sedimenting the sludge of the organic wastewater sent from the aeration tank, wherein the organic wastewater is supplied to the flow rate adjustment tank or the aeration tank. Provided with a gas-liquid mixer for mixing air with the organic wastewater. Further, according to the present invention, a flow rate adjusting tank for temporarily storing organic waste water, and an aeration tank for sending a predetermined amount of organic waste water from the flow rate adjusting tank and mixing it with air and contacting with microorganisms. And sedimentation of the sludge of the organic wastewater sent from the aeration tank, a sedimentation tank for discharging the supernatant to a river or the like, and concentrating the bottom sludge of the sedimentation tank. In an organic wastewater treatment device including a concentration tank that returns to an aeration tank, air is mixed with the organic wastewater between the concentration tank and the aeration tank and either the flow rate adjustment tank or the aeration tank. An apparatus for treating organic wastewater, comprising a gas-liquid mixer for causing the mixture to flow.

The gas-liquid mixer is provided with a suction means such as a pump for sucking and refluxing waste water from each of the additionally provided parts, and further contains oxygen or pure ozone gas or contains them. The apparatus is provided with at least gas-liquid mixing means such as a compressor for mixing air with the suctioned waste water. The gas-liquid mixer is normally stopped, and is operated when the amount of wastewater exceeds the processing amount of the processing apparatus. According to the organic wastewater treatment device of the present invention, the air is efficiently mixed into the wastewater by the gas-liquid mixer to improve the content of oxygen and the like in the wastewater,
Since the activation of microorganisms can be promoted, particularly effective wastewater treatment can be efficiently performed in wastewater treatment where biological treatment is extremely important. Therefore, even if the processing apparatus is relatively small as a whole, the wastewater treatment can be efficiently performed by operating the gas-liquid mixer according to the processing amount.

[0008] The term "installable and removable" means that the gas-liquid mixer can be additionally installed and removed according to the amount and quality of wastewater required to be treated. That is,
The gas-liquid mixer is installed as necessary when the processing capacity of the entire organic wastewater treatment apparatus according to the present invention is inferior to the amount of wastewater to be treated, excluding the gas-liquid mixer, and is removed if unnecessary. May be stored separately. By selecting the installation, it is possible to perform extremely rational treatment of wastewater whose quantity and quality change from time to time as a whole of the treatment apparatus. Moreover, the gas-liquid mixer only needs to include the suction means and the gas-liquid mixing means, and does not require a wide area and large-scale construction work for installation, removal, and storage, so that the economic burden is small.

The volume ratio of the amount of raw water in each section where the gas-liquid mixer is installed to the amount of circulating water circulated by the gas-liquid mixer is preferably from 1: 1 to 10, particularly preferably 1: 3. Also,
The volume ratio of the amount of circulating water to the amount of air to be mixed is appropriately determined depending on the pollutant concentration of the wastewater and the properties of the air to be mixed, but the amount of circulating water: air amount = 1: 0.05 to 0.4, particularly 1: 0.2 is preferred. Furthermore, the water exchange rate of each part where the gas-liquid mixer is installed (volume m ^{3 of} each part / circulation amount m ³ /
The time) is appropriately determined depending on the pollutant concentration of the waste water, etc., and is preferably several times / hour.

[0010]

[Examples]
Preferred embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a view showing a process of an organic wastewater treatment apparatus according to the present invention. In the figure, the processes performed in the flow control tank 1, aeration tank 2, sedimentation tank 3, and concentration tank 4 are the same as those of the conventional processing apparatus shown in FIG. Each of the gas-liquid mixers 5 and 5 'adopts the configuration shown in FIG. 2 described later. Among them, the gas-liquid mixer 5 sucks the wastewater stored in the flow rate adjusting tank 1, and supplies oxygen thereto. After being fed under pressure and mixed, the mixture is returned to the flow control tank 1. Therefore, the wastewater stored in the flow control tank 1 contains a large amount of oxygen,
In the aeration tank 2 in the next step, the activation of microorganisms is promoted,
Significantly reduce the content of organic substances. Although microorganisms are not usually introduced into the flow control tank 1, since microorganisms are present in the air and wastewater, the gas-liquid mixer 5 is used.
By containing oxygen, the effect of activating microorganisms existing in the natural world and reducing the content of organic substances is also exerted.

On the other hand, a gas-liquid mixer 5 ′ provided between the concentration tank 4 and the aeration tank 2 sucks the desorbed liquid from the concentration tank 4 and mixes it with oxygen to produce waste water. The activity of microorganisms that are slowed down by the oil and coagulant originally present or the coagulant temporarily supplied by the sedimentation tank 3 can be activated. FIG. 2 is a configuration diagram showing a state where the gas-liquid mixer 5 is installed in the flow rate adjusting tank 1. The gas-liquid mixer 5 basically has a circulation pump 6, a compressor 7, and a stirrer 8. Regarding each operation, the circulation pump 6 pumps up the wastewater from the flow control tank 1 via the pipe 9 and the joint portion 11 and circulates the wastewater to the stirrer 8. The waste water in the stirrer 8 is supplied to the compressor 7
Is supplied from the mixture, and the mixture is stirred by the stirrer 8, thereby promoting the mixing. The wastewater mixed with oxygen is returned to the flow control tank 1 through the pipe 9 ′ and the joint 11.

[0012] With this configuration, the wastewater to be treated always contains a large amount of oxygen, so that the activation of microorganisms is promoted and the wastewater treatment is suitably performed. The gas-liquid mixers 5 and 5 'have a very simple configuration as shown in FIG. 2 and do not require an installation place, so that they can be installed and removed as needed.

Table 1 shows the results of experiments on wastewater treatment by the organic wastewater treatment apparatus according to the present invention.

[0014]

[Table 1]

In this experiment, an organic wastewater treatment apparatus according to the present invention was installed in a human waste treatment plant. On August 19, the date shown in Table 1, the treatment apparatus shown in FIG.
The gas-liquid mixer 5 is additionally provided. Gas-liquid mixer 5
Before the installation, the wastewater with a maximum of 375% of the design water volume was accepted, the biological purification was not enough due to the influence of the flocculant, the sedimentation of the sludge was poor in the sedimentation tank 3, and the sludge flowed out from the sedimentation tank. Was. 8 equipped with gas-liquid mixer 5
The remarkable results after March 19 are described below. BOD (Biological oxygen demand) decreased (before: 8.6-
64 → day later: 3 to 13 ppm). The sedimentation of the sludge was improved, and the outflow from the settling tank 3 was eliminated. The SVI (Sludege Volume Index), which indicates the sedimentation of sludge, was calculated.
0 → Day later: 120. The dissolved oxygen concentration in the aeration tank could be improved (before: 2 → day: 4 ppm). As a result, the amount of aeration in the aeration tank 2 can be reduced, and the power consumption can be reduced. There is no need to add coagulants, nutrients, and pH adjusters. The activity of sludge increased, and the amount of sludge to be disposed of was reduced by 50 to 60% due to the progress of self-decomposition of sludge. Thus, it can be confirmed that the additional installation of the gas-liquid mixer 5 is extremely effective.

[0016]

As described above, according to the organic wastewater treatment apparatus of the present invention, by providing a gas-liquid mixer, even a relatively small-scale treatment apparatus can sometimes have a small quantity and quality. The fluctuating organic wastewater can be sufficiently treated without waste. Since the gas-liquid mixer has a very simple configuration, it can be installed and removed, and when designing the processing apparatus, a relatively small design specification can be adopted as a whole. Therefore, the economic burden is small.

[Brief description of the drawings]

FIG. 1 is a view showing a treatment process of an organic wastewater treatment device of the present invention.

FIG. 2 is a diagram showing a configuration of a flow rate adjusting tank 1 and a gas-liquid mixer 5;

FIG. 3 is a view showing a processing step of a conventional organic wastewater treatment apparatus.

[Explanation of symbols]

 1. Flow control tank 5. Gas-liquid mixer 6. Circulation pump 7. Compressor 8. Stirrer 9, 9 '. Tube 10. 10. Pipe to aeration tank 2 Joint part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tatsuo Suzuki 2-5-8 Kita-Aoyama, Minato-ku, Tokyo Tokyo, Japan (72) Inventor Hirohiko Akase 2-14-4 Motofujisawa, Fujisawa-shi, Kanagawa Corporation Inside Sunmec (72) Inventor Michio Itoi Inside 2-2-18 Nihonbashi, Chuo-ku, Tokyo Cellpore Industries, Ltd.

Claims (3)

[Claims] 1. A flow rate adjusting tank for temporarily storing organic waste water, an aeration tank for sending a predetermined amount of organic waste water from the flow rate adjusting tank, and mixing the air with the microorganism and contacting with microorganisms. An organic wastewater treatment device comprising: a sedimentation tank for sedimenting the organic wastewater sent from the aeration tank; and a gas-liquid mixer that mixes the organic wastewater with the flow rate adjustment tank or the aeration tank. An organic wastewater treatment device, comprising: 2. A flow regulating tank for temporarily storing organic waste water, an aeration tank which is supplied with a predetermined amount of organic waste water from the flow regulating tank and mixes air therewith and makes contact with microorganisms. The sediment of the organic wastewater sent from the aeration tank is settled, and the sedimentation tank for discharging the supernatant liquid to rivers, etc., and the bottom sludge of the sedimentation tank are concentrated, and the desorbed liquid is sent to the aeration tank. An organic wastewater treatment device comprising a recirculating concentration tank, wherein a gas-liquid mixture between the concentration tank and the aeration tank, and either the flow rate adjustment tank or the aeration tank and air mixed with the organic wastewater. An organic wastewater treatment device comprising a mixer. 3. The organic wastewater treatment apparatus according to claim 1, wherein the gas-liquid mixer is installed and removed.