JPH0719598Y2 - Upflow filtration device with integrated deodorization device - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention is a simple deodorizing device integrated type that can remove SS in organic wastewater such as sewage by filtration and effectively remove the bad odor generated in the filtration. Countercurrent filtration device.

[0002]

2. Description of the Related Art The purification treatment of organic wastewater such as sewage, night soil, industrial wastewater, etc. is widely performed, but consists of many various treatment steps. In the purification treatment of this organic wastewater, due to the nature of the organic wastewater to be treated, it is inevitable that a foul-smelling gas will be generated from the purification treatment and the apparatus related thereto, and the discharge of the stench gas will be minimized. It is necessary to suppress it. Therefore, it is necessary to deodorize the malodorous gas at the source of the malodorous gas. The deodorizing process of the malodorous gas generated from the purification process and the device related to it is different from each source because the malodorous gas generated from various devices and the components of the malodorous gas generated depending on the processing content are different. It is usually carried out by the device. Therefore, if a separate deodorizing device is provided in addition to the purification device that originally requires a large-capacity device, the equipment cost and installation area of both devices will increase. In reality, it is quite difficult to sufficiently install a deodorizing device for offensive odor gas.

A method for biologically deodorizing malodorous gas is also known, but the component contained in malodorous gas is S.
O _x, because there NO _x, primarily acidic components such as Cl _x, becomes liquid property of the processing unit is an acidic, because coming deviates from the optimum conditions for microbial activity, large amount of alkali agent for neutralization adjusting pH It was also necessary for the equipment, and also required equipment separate from the sewage treatment equipment.

[0004]

The present invention is intended to remove SS by filtering organic sewage such as sewage, and to generate offensive odor gas from this process and other processes related to purification treatment (for example, sedimentation tank, sludge). The malodorous gas generated from the treatment facility) and further the malodorous gas generated from other equipment can be associated with other purification processing equipment without using an independent dedicated deodorizing equipment, and with a compact and simple structure. ,
It is an object to provide an apparatus capable of extremely deodorizing treatment.

[0005]

According to the present invention, when an organic sewage is filtered to remove SS, an odorous gas is generated from the organic sewage, and the odorous gas must be deodorized. It does not happen, and when the deodorizing process of the malodorous gas is carried out by a wet process, the processing wastewater is generated from the process, so by performing both processes in a single tank, a compact device can be configured. It was made by paying attention to it.

That is, the present invention was able to solve the above problems by the following means. A packing layer A of granular filter media is provided below the water surface in the tank, and a packing layer B of particles having a three-dimensional mesh structure is provided on the water surface of the tank.
While supplying organic sewage from the lower part of the packed bed to carry out upward flow filtration and sprinkling water from the upper part of the packed bed B
Is an upflow filtration device integrated with a deodorizing device, which is characterized by supplying a malodorous gas from the lower part of the.

In the present invention, a packed bed A of granular filter material is provided below the water surface in the tank, and organic sewage is supplied from the lower part of the packed bed A for upward flow filtration, and from above the packed bed A. Discharge outside the tank. At that time, the organic sewage passes through the packed bed A, so that the malodorous gas is released above the packed bed A. Further, on the water surface of the tank, for example, a packed bed B of a granular material having a three-dimensional network structure is provided slightly above the water surface, and the malodorous gas released from the organic wastewater in the packed bed A, or a treatment device therefor. While passing a malodorous gas generated in another part of the device or another device, water is sprinkled from the upper part of the packed bed B to perform a deodorizing process, and the waste water generated by the process is discharged to the lower part of the packed bed B, that is, the packed It is discharged from the upper part of the layer A to the outside of the tank together with the filtered organic waste water.

The filling layer A is formed by holding a granular filter medium on a liquid-permeable holding member provided in the lower part of the tank so that it is below the water surface. By supplying the organic sewage to the lower side of the packed bed A and flowing the organic sewage to the packed bed A in an upward flow, physical filtration is performed and SS is removed. Further, the packing layer B is formed by holding the granular material having a three-dimensional network structure on the breathable and liquid-permeable holding member on the water surface of the tank.

A space is formed between the packed bed A and the packed bed B, which corresponds to a gap between both layers, from which the organic waste water filtered is discharged out of the tank. Further, here, the malodorous gas is released from the filtered organic wastewater. This malodorous gas rises and passes to the upper packed bed B. that time,
The odorous gas from any other source can be supplied to the space.

By spraying water onto the packed bed B,
Since the packed bed B is in contact with air and is under an aerobic condition, an aerobic deodorizing process is performed. The operating conditions such as the amount of water sprinkled from the sprinkler provided at the upper part of the packed bed B, the amount of malodorous gas supplied, the amount of organic sewage supplied, etc. are the water quality standards for the target treated water, the type and properties of the odorous gas and organic sewage, etc. It is desirable to set appropriately according to the above.

As the granular filter medium used for the packed bed A, a granular filter medium is preferably used in view of filtration efficiency. The granular filter medium is preferably a hollow cylinder or the like having a very high porosity of 80% or more, and the material thereof is preferably polypropylene having a specific gravity of 1.0 or less. Since such a granular filter medium has an extremely high porosity, it has advantages that the filter medium is not significantly clogged, and the filter medium can be completely prevented from flowing out of the system.

Further, as the granular material having a three-dimensional network structure used for the packed bed B, a granular filter medium having a three-dimensional network structure is used, and the clogging of the filter medium is extremely small, and the filter medium is prevented from flowing out of the system. In addition to having the effect of being able to completely prevent it, this product retains microorganisms at a high concentration in the network structure inside the filter medium because the packed bed B is in air and under aerobic conditions. The deodorizing process of bad smell gas is performed well.

[0013]

The structure and operation of the present invention will be described in detail with reference to FIG. FIG. 1 shows a schematic view of the filtration device of the present invention. Reference numeral 1 denotes a tank, which has a packed bed A made of granular filter material in the center of the tank 1, and an organic wastewater below the bed A. And an filtered water outflow portion 3 above the same layer A. A water surface 5 is formed by the filtered water outflow portion 3, and a sludge discharge portion 4 is provided in the lower portion of the apparatus.

A packing layer B of granular material having a three-dimensional network structure is provided above the water surface 5, and a malodorous gas is introduced from a malodorous gas supply unit 6 between the packing layer B and the water surface 5. Further, a water sprinkler 8 connected to the water supply unit 9 is provided above the packed bed B, and water is sprinkled on the packed bed B while rotating. The sprinkled water is packed bed B
Most of the malodorous components are decomposed by the microorganisms after moistening various deodorant microorganisms that propagate inside and on the surface of the granular material having a three-dimensional network structure and absorbing the malodorous components in the malodorous gas. It The water falling from the packed bed B flows out together with the filtered water. The malodor generated from the water surface 5 of the filtering device is also deodorized by the packed bed B together with the malodorous gas. The filtered water, etc., after being discharged from the filtration device, is subjected to the subsequent treatment by a biological treatment device or the like.

However, as the filtration process of the organic wastewater is continued, the trapped amount of SS in the packed bed A for filtration reaches saturation, and if it is continued more than that, SS leaks into the treated water. Is stopped, and the packed bed A (also referred to as "filtration bed A") is washed in the following operation sequence. Open the control valve 10 to drain, lower the water level a little,
Close 0. After that, the air blower 11 is driven, air is vigorously ejected from the air diffuser 13 via the cleaning air supply unit 12, and the inside of the filtration layer A is vigorously stirred by the ascending force of the bubbles. Operation When the air blower 11 is driven, the valve 10 is opened and almost all the water in the filtration device is drained, so that a large amount of SS trapped in the filtration layer A is discharged, and the filtration layer A is in a clean state. Return to.

The filtration layer A can be washed by the extremely simple operation as described above. In FIG. 1, 14 is a grid (grating) that prevents the filter medium from flowing out during drainage, and 15 is a grid that prevents the filter medium from flowing out during filtration, and a buoyant filter medium is used as the filter medium. Provide if necessary. In the present invention, when the air blower 11 is driven and the packed bed A is washed with air, a malodor is generated from the upper part of the filtration layer, but this malodor is biologically deodorized in the process of passing through the packed bed B. It has a great effect that no odor is emitted in the surrounding area.

In the packed bed B, the bacterial flora involved in deodorization is fixed to the above-mentioned particulate matter by spontaneous growth of an appropriate strain according to the principle of substrate compensation. At the start of operation of the device,
The granular material having the bacterial phase may be filled in advance, or the packed bed B may be treated so that the bacterial phase grows. As the water to be sprayed on the packed bed B, clear water having a small BOD component needs to be used in order to suppress the growth of various bacteria other than the bacteria involved in deodorization. In addition to this, tap water and various treated water can be applied.
Filtered water may be used, or clear water obtained by further treating the filtered water may be used.

Further, in the conventional biological deodorizing section, an alkaline agent was administered to neutralize the acidic components (SO _x , NO _x , Cl _x etc.) trapped therein, but the packed bed B of the present invention was used. Since, acidic components and deposits are washed and removed by sprinkling clear water, a neutralizer is not required. The acidic components, the metabolites of bacteria, the adhered substances, etc. washed here go out of the tank 1 from the filtered water outflow portion 3 near the water surface 5 together with the sprinkled water.

According to the present invention, since the apparatus is vertically integrated, it has the effect of saving space and reducing the construction cost, in addition to providing the complementary operation in terms of processing as described above. is there.

[0020]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. This example shows the case of sewage treatment. Example 1 After removing coarse foreign matters from the sewage with a mesh bar screen,
The basic configuration was as shown in FIG. In a tank 1 of the same apparatus, SS was 120 mg / liter of sewage, and a hollow cylindrical filter medium (made of polypropylene, floating in water because the specific gravity is 1 or less) having a diameter of 20 mm and a length of 20 mm had a layer thickness of 2.5. Filtration layer A filled up to 3.0 m
Passed upwards. At this time, the filtration rate (LV) is 400
At a high speed of m / d, S from the sewage above 8 μm
Almost all of S could be removed. The obtained filtered water has an SS of 27 to 32 mg / liter, and has a high SS.
A removal rate was obtained. The filtration duration was as long as 24-28 hours.

On the other hand, in the packing layer B for deodorization, a polygonal polyurethane foam (having a three-dimensional network structure) having a particle size of 10 × 25 × 25 mm is packed in a layer thickness of 0.4 m and clarified from above. Water (secondary treated water of sewage) was sprinkled from the sprinkler 8 to keep the polyurethane foam in a wet state. A liquid gas ratio (L / G) of 2 liters H ₂ O / m ² gas was sufficient because the amount of water sprinkled was only to prevent the polyurethane foam from drying.

As the malodorous gas, the malodorous gas derived from the sand basin of the sewage treatment plant was deodorized. The ventilation rate (LV) of the malodorous gas to the packed bed B was set to 0.1 m / sec. The malodorous components of the malodorous gas are hydrogen sulfide and methyl mercaptan, and their concentrations are 27-38 ppm and 8.6-
It was 10.9 ppm. One week after the start of operation, the polyurethane foam of the packed bed B was taken out and observed under a microscope.
As a result of analyzing the exhaust gas from the packed bed B with an analysis gas, hydrogen sulfide was 0.005 ppm or less, methyl mercaptan was not detected, and it was effectively removed. In addition, the filtration layer A
In the air washing, when the air flow velocity (LV) was set to 0.05 m / sec based on the filtration layer empty column standard, the filter medium could be washed well and the discharge from the packed bed B during the air washing When the malodorous component of the gas was measured, hydrogen sulfide was 0.005 ppm, and methyl mercaptan was not detected. The malodorous gas was supplied from the malodorous gas supply unit 6 as it was during the air cleaning of the filtration layer A.

[0023]

The effect of the present invention has the following remarkable effects. 1) Since SS removal of organic wastewater and deodorization of malodorous gas can be performed simultaneously in the same device, the installation area of the device can be small and construction cost can be reduced. 2) No offensive odor is emitted from the device for filtering SS of organic sewage, and no offensive odor can be leaked to the surroundings during air cleaning of the filter layer. 3) Since it is not necessary to use an alkaline agent for pH adjustment, which was required in the conventional biological deodorization method, no chemical cost is required for deodorization and no pH adjustment control is required.

[Brief description of drawings]

FIG. 1 is a schematic view of an upflow filtration device integrated with a deodorizing device of the present invention.

[Explanation of symbols]

 A packed bed B packed bed 1 tank 2 organic sewage inflow part 3 filtered water outflow part 4 drainage part 5 water surface 6 malodorous gas supply part 7 deodorant gas 8 sprinkler 9 water supply part 10 valve 11 air blower 12 cleaning air supply Part 13 Air diffuser 14 Lattice 15 Lattice

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B01D 53/38 53/77 8925-4D B01D 29/08 530 C 8925-4D 540 A

Claims (1)

[Scope of utility model registration request] 1. A packing layer A of granular filter medium is provided below the water surface in the tank, and a packing layer B of granular material having a three-dimensional mesh structure is provided on the water surface of the tank, and the organic layer is supplied from the bottom of the packing layer A. Effluent is supplied from the upper part of the packed bed B, and malodorous gas is supplied from the lower part of the packed bed B, as well as the odorous sewage is supplied to the upflow filter. apparatus.