JPS61136490A - Aeration type waste water treatment apparatus - Google Patents

Abstract

PURPOSE:To rapidly purify waste water, by packing a receiving part formed of a perforated material with a porous ceramic particulate material based on clay and obtained baking clay to which a void forming material has been added. CONSTITUTION:Waste water introduced into the storage part 3 in an aeration tank A is brought to a flow state accompanying a horizontal stream, a vertical stream and a turbulent stream by barrier plates 4 and diffused by air diffusers 5 to increase dissolved oxygen and purification action is performed by activated sludge fixed to the ceramic particulate material 2 allowed to pack a treatment part 1. The ceramic particulate material 2 is based on clay and has a porous structure formed by baking clay to which a void forming material such as sawdust or hull has been added.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a wastewater treatment device for treating wastewater containing pollutants such as organic pollutants, and more specifically, an aeration tank having a treatment section filled with ceramic granules. The present invention relates to an aerated wastewater treatment device that can effectively treat highly concentrated organic wastewater in a short period of time.

2. Description of the Related Art Conventionally, an activated sludge method has been mainly employed as a method for treating polluted wastewater, for example, organic wastewater.

This activated sludge method uses the biological assimilation effect of activated sludge to decompose and remove pollutants such as organic substances in an aeration tank where introduced wastewater reacts with activated sludge made of microorganisms. As is well known, this is a method.

However, during this sludge treatment, the activated sludge that has completed its biological assimilation process becomes sludge itself, becomes suspended in the tank, and is also deposited, so the sludge must be separated and drawn out from the tank from time to time. On the other hand, in order to cultivate the activated sludge in the tank, it is necessary to return some of the separated sludge and adjust the amount of sludge in the tank, which not only complicates these operations but also reduces the processing time. There is a drawback that sometimes bulking occurs due to a lack of oxygen in the put stock part of the tank, and there is a strong desire to solve this problem.

In addition, as another method of the activated sludge method, a contact aeration method is known in which wastewater is treated by immersing a filter medium for fixing activated sludge in an aeration tank, but in this method, the filter medium is simply Since the activated sludge is composed of so-called waste materials such as wood, cork, rocks, and slag, the effective surface area for the activated sludge is extremely small, and therefore the BOD load per volume is also small. The biological assimilation function of the reactor is no longer carried out properly, and the efficiency of wastewater treatment deteriorates, leading to the generation of a large amount of unreacted sludge, which has little practical value.

The present invention was made in order to eliminate the drawbacks of conventional wastewater treatment equipment, and it uses ceramic granules, which have an extremely large effective surface area for fixing activated sludge, to collect wastewater from a wastewater storage tank, etc. The purpose is to efficiently purify wastewater with a device constructed with a filling material of A housing section is formed with a porous material such as, and the interior thereof is filled with porous ceramic granules made by firing clay as a main component and adding a pore-forming material thereto. The aeration type wastewater treatment apparatus includes a treatment section appropriately installed at a position crossing the flow direction of the wastewater, and an aeration device disposed in the aeration tank.

Hereinafter, the apparatus according to the present invention will be explained based on the attached drawings. In the drawing, A is a contact type aeration tank, which collects wastewater fed from a storage tank that stores wastewater discharged from various industries. Introduced via a feeding means such as a pump, and
It has a size, that is, a capacity, that can accommodate the introduced wastewater at a certain level, and inside the tank A, a mesh body made of stainless steel or the like is placed at an appropriate interval at a position crossing the flow direction of the wastewater in the tank A. A processing section 1 consisting of a framed barrel is installed upright, and the processing section 1 is filled with ceramic granules 2 for fixing activated sludge.

The ceramic granules 2 have a porous structure obtained by baking clay as a main component, adding pore-forming materials such as sawdust, rice hulls, urethane powder, etc. , the easily deformable acid has a hardness that does not turn into powder, and the surface area necessary for fixing the activated sludge is 60 mm when the processing section 1 is filled with 1 d of sludge.
0.000 n? Furthermore, the ceramic granules 2 have a shape suitable for culturing and colonizing a series of bacterial cells constituting activated sludge, that is, aerobic bacteria, intermediate bacteria, and anaerobic bacteria. There is.

Note that the raw material for the ceramic granules 2 is composed of a mixture of clay and silica stone, and a pore-forming material is added thereto and fired to form porous ceramic granules 2, which are filled as described above. It can also be used as a material.

Further, in the wastewater storage section 3 located between the processing sections 1, there is a tank A.
A plurality of baffle plates 4 made of water-permeable plates with a large number of holes bored from above are inserted in a hanging state, and an air diffuser 5 is disposed below the baffle plates 4 to allow the stored wastewater to flow. ,
That's what I'm saying.

Further, below the aeration device 5, that is, at the bottom of the tank A, a sludge drawing pipe 6 is provided for drawing out sediment such as sludge that accumulates with the number of wastewater treatments.

In this way, a treatment section 1 filled with ceramic granules 2 is installed in the aeration tank A, and wastewater storage sections 3 are present at alternating intervals with the treatment section 1. A baffle plate 4, an air diffuser 5, and a sludge drawing pipe 6 are disposed in tank 3, and the wastewater introduced into tank A is sequentially flowed in the direction of the arrow in the figure for cleaning treatment. has been done.

At this time, as shown in the figure, the upper part 1a of each processing section 1 in tank A
If it is located at least above the introduction wastewater level rule, for example, the introduced concentrated polluted wastewater can first be concentrated in the vicinity of the wastewater feed pipe 7 having the pipe opening communicating with the tank A, and then flow into the tank A. At the same time, it is possible to ensure that the concentrated polluted wastewater is removed from the ceramic granules 2 in the adjacent treatment section l.
Therefore, the untreated water in tank A does not flow out to another adjacent wastewater storage section 3 or the treatment section 1, and under this condition, each treatment The waste water is purified by the section 1, and the treated water can be sequentially fed in the direction of the arrow in the figure.

Furthermore, if the aeration tank floor surfaces 1b that are in contact with the bottom surface of the processing section 1 in the upright state are respectively raised up as shown in the figure so that the bottom surface of the processing section 1 is placed on the upper side, the tank A The bioassimilation effect of the activated sludge can be carried out efficiently without bringing sediment such as unnecessary sludge deposited at the bottom of the wastewater storage part 3 into contact with the activated sludge fixed on the ceramic granules 2, As a result, the purification effect of wastewater can proceed rapidly.

In addition, what is shown by 8 in the figure is a conveyance pipe for conveying the treated water from the aeration tank A to, for example, a separately installed settling tank.

According to the apparatus according to the present invention having the above configuration, the wastewater introduced into the storage section 3 in the aeration tank A is transferred to the baffle plate 4.
The activated sludge is brought into a fluid state with horizontal flow, vertical flow, turbulence, etc., and is diffused by the air diffuser 5 to increase dissolved oxygen, which is fixed in the ceramic granules 2 filled in the processing section 1. That is, the purifying action of the wastewater is carried out in one step by aerobic bacteria living on the surface of the ceramic granules 2 in the treatment section 1, and anaerobic bacteria in the middle part and the back surface. It is.

Furthermore, the wastewater treatment action depends on the number of treatment units 1 installed at positions crossing the wastewater flow direction in the tank A.
The plane progresses in the direction of the arrow in the figure, and altitude processing is performed one by one.

Next, examples will be described.

Example 1 In an aeration tank consisting of a casing with a height of 300 am and a length of 250 am, a frame made of stainless steel mesh with a medium size of 25 C1 and a height of 250 cs was placed at intervals of 30 cm in the longitudinal direction of the nuclide. The treated treatment parts are supported by standing parts raised up on the bottom of the tank, and the wastewater storage part located between each treatment part is equipped with a baffle plate made of a perforated plate and a diffuser. An air system and a sludge drawing pipe are installed, and a 2011
Filled with ~3cm square irregular ceramic particles,
Activated sludge is fixed on this packing material, and pigment printing wastewater is allowed to flow into the tank, and the baffle plate turns the inflowing wastewater into a vortex, and the aeration device diffuses it into a fluid state. After 3 hours of biological assimilation using activated sludge in the treatment section, the BOD removal rate in wastewater was over 70%.

Example 2 When the same treatment as in Example 1 was carried out for 5 hours, the BOD removal rate in wastewater was 90% or more.

As described above, the aeration type wastewater treatment device according to the present invention includes an aeration tank having a size that can accommodate various types of wastewater at a certain level, and a storage section formed of a porous material such as a rope, and clay inside the aeration tank. a treatment section which is filled with porous ceramic granules made by adding a pore-forming material to the main component and firing the same, and which is appropriately installed at a position crossing the direction of flow of wastewater in the aeration tank; Since this is an aeration-type wastewater treatment device consisting of an aeration device installed in the aeration tank, the growth substrate for sludge bacteria is lower than that of conventional wastewater treatment devices using activated sludge, such as contact aeration method devices. Due to the large surface area of the carrier, which is suitable for the fixation of activated sludge in the equipment, and the high adaptability to the sludge bacteria, it is difficult to purify the sludge. This makes it possible to effectively treat machine wastewater, etc., in a short period of time.

Therefore, the processing cost is greatly reduced, and
The wastewater to be treated is highly treated and can be reused.

[Brief explanation of drawings]

The drawing is an explanatory diagram of an embodiment of the aeration type wastewater treatment apparatus according to the present invention. l...processing section, 2...ceramic granules, 3...
Wastewater storage section, 4... baffle plate, 5... air diffuser, 6.
...Sludge extraction pipe, 7...Wastewater supply pipe, 8...Transportation pipe, A...Aeration tank, -1...Introduced wastewater level. Patent applicant: Filton International Co., Ltd.

Claims (5)

[Claims] (1) An aeration tank with a size that can contain wastewater at a certain level, and a storage section made of a porous material such as a mesh, with clay as the main component and a pore-forming material added thereto. a processing section that is filled with porous ceramic granules fired in the aeration tank, and that is appropriately erected at a position crossing the wastewater flow direction in the aeration tank; and an aeration device that is disposed in the aeration tank; Aeration type wastewater treatment equipment consisting of. (2) The aeration type wastewater treatment apparatus according to claim 1, wherein the upper part of the treatment section is located above at least the level of the introduced wastewater. (3) The aeration type wastewater treatment device according to claim 1, wherein the aeration tank floor surface that contacts the bottom of the treatment section is raised up. (4) The aerated wastewater treatment device according to claim 1, wherein a plurality of the treatment sections are installed, and each wastewater storage section located between the treatment sections is provided with an aeration device. (5) 1 of Claim 1, wherein the ceramic granules are made of clay mixed with silica stone as a raw material.
Pneumatic wastewater treatment equipment.