JPS6211596A - Treatment of waste water by microbe and apparatus therefor - Google Patents

Abstract

PURPOSE:To removed COD even in oil-contg. waste water by immobilizing microbes on a ceramic granular material packed in a column, mixing the ceramic granular material with a carbonized material and passing waste water through the column. CONSTITUTION:Microbes capable of treating pollutants in waste water flowing in a column such as org. material digesting bacteria exemplified by methane bacteria and bacilli and inorg. material accumulating independent nutrient bacteria such as nitrification bacteria and iron oxidizing bacteria are immobilized on a porous ceramic granular material packed in a column and obtained by adding a pore forming material to the essential component of clay and baking the mixture, the ceramic granular material and a carbonized material (e.g., activated carbon) are mixed and the waste water is passed through the column. Consequently, the COD in oil-contg. waste water which has not been removed by the conventional method can be removed for a long period.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to wastewater treatment using microorganisms fixed on carrier particles, and more specifically, the treatment of wastewater from various industries and household wastewater, etc. using microorganisms fixed on ceramic granules. The present invention relates to a wastewater treatment method and apparatus that can remove COD, etc. with high efficiency.

(Prior Art) Fluidized bed water treatment methods have been widely known in which wastewater is biochemically treated by attaching a microbial film to carrier particles such as activated carbon or sand to form a fluidized bed.

For example, Japanese Patent Publication No. 59-45439 discloses a biological treatment method for wastewater in which BOD is removed biochemically in a fluidized bed of granular media to which microorganisms are attached.
In this treatment method, the wastewater is first passed in a downward flow for a certain period of time during the microbial cultivation period at the initial stage of operation to facilitate the attachment of the microorganisms to the medium surface, and normalization is achieved by the attachment and cultivation of the microorganisms. After returning to function, it has been proposed to pass water in an upward flow to fluidize the granular media with attached microorganisms.

(Problems to be Solved by the Invention) However, in such conventional methods, the granular medium to which the microorganisms are attached is made of sand, zeolite, coke,
Since it is made of a material such as activated carbon, the effective surface area for the microorganisms to colonize is small, and therefore, although it is possible to biochemically remove BOD, nitrification, denitrification, etc. of IT in wastewater, For example, it is difficult to purify commercial wastewater that contains machine oil, surfactants, etc. that inhibit the oxygen transfer necessary for the growth of microorganisms, and in particular, it is difficult to perform purification on industrial wastewater that contains mechanical oil and surfactants that inhibit the oxygen transfer necessary for the growth of microorganisms. CO caused by
It is impossible to perform the COD removal action in the wastewater according to the number D indicated.

(Means for solving the problems) The present invention solves the above-mentioned conventional problems, and
C in oil-containing wastewater caused by microorganisms, which was previously thought to be impossible.
The purpose of this work is to provide a new wastewater treatment method and equipment that also realizes the removal of OD.

That is, to explain the contents based on the drawings (flow sheets) corresponding to the embodiments, for example, the flow rate is adjusted as appropriate using a feed pipe 2 connected to a waste water treatment tank 1 that accommodates treated waste water. While delivering the wastewater,
The medium in the column 5 having a size to receive a certain amount of wastewater, that is, the porous ceramic granules made by adding a pore-forming material to the clay as a main component and firing the medium, at least in the column. Microorganisms for treating pollutants in inflowing wastewater, such as methane bacteria,
Organic matter-digesting bacteria such as rod-shaped bacteria and inorganic matter M-autotrophic bacteria such as nitrifying bacteria and iron-oxidizing bacteria are colonized, and the wastewater is fed at a flow rate to a filler 6 made by mixing the ceramic granules with a carbonized material such as activated carbon. There is a method and a device for processing it.

(Function) First, wastewater in the wastewater treatment tank 1, for example, oil-containing wastewater, is sent to the outside of the tank 1 through the feed pipe 2 using the pump P, and the flow meter 4 is fed through the valve 3 which is in an open state. The flow rate is detected, the flow rate is adjusted by the valve 3, and the excess amount is returned to the processing tank 1 by the compressor C through the return pipe 2a.

Further, an appropriate amount of wastewater is transferred through the feed pipe 2 extending from the flow meter 4 to the column 5 communicating with the external feed pipe 2.

In addition, in this column 5, there is a ceramic colonized with microorganisms consisting of the above-mentioned inorganic accumulation autotrophic cells for removing inorganic pollutants in wastewater and organic matter digesting bacteria for removing organic pollutants. The granules are mixed with charcoal, which mainly acts to adsorb and remove suspended matter in the wastewater, and purify the wastewater flowing into the column 5.

This purifying action has a hardness that does not easily deform or turn into powder even when it comes into contact with the wastewater, and the effective surface area necessary for colonizing the microorganisms is, for example, 1r+? When it is filled, it is carried out by the synergistic action of the microorganisms colonized in the ceramic granules, which are extremely vast at 600,000 m, and the carbide, so that the unprecedented movement of oxygen and nutrients is sustained. From now on, by culturing the microorganisms and continuing their assimilation action, the removal action of COD in the wastewater containing the surfactant etc. is carried out.

By the way, the COD indication number is mostly caused by the decomposition of inorganic substances in wastewater, but it is also possible that the COD indication number is disaggregated and exists in the BOD indication number caused by the decomposition of organic substances. In the present invention, the ceramic granules 6 having a large surface area are used as a culture medium for microorganisms, and the disaggregated parts are used to co-propagate microorganisms that purify inorganic and organic pollutants. The microorganisms and the like perform a wide-ranging action to remove COD and the like caused by the decomposition of inorganic or organic substances in wastewater.

(Example) Hereinafter, an apparatus according to the present invention will be specifically described based on an example shown in the drawings.

In the figure, 1 is a wastewater treatment tank, and a pump P is installed inside the tank or on the outside of the tank 1. The pump P is connected and communicated with a feed pipe 2 having a length that projects outside the tank 1. The feed pipe 2 further includes waste water W fed from inside the waste water treatment tank 1.
It communicates with a valve 3 located on the inlet side of a flow meter 4 that adjusts the flow rate of the waste water W, and supplies the waste water W to the flow meter 4 through the valve 3. Incidentally, the excess wastewater is returned to the wastewater treatment tank 1 by driving the compressor C through the return pipe 2a.

Next, a feed pipe 2 extending from the other side of the flow meter 4 is
is a porous ceramic granular material whose main component is clay, with the addition of a pore-forming material and fired, and a method for treating pollutants attached to the ceramic granular material, at least in inflowing wastewater. The column 5 is connected to the upper opening side of a column 5 filled with a packing material 6 consisting of as much microorganism as possible and a carbide mixed with the ceramic particles.

That is, as mentioned above, the ceramic particles in the column 5 have a special porous shape and have a large surface area, so that the organic matter-digesting bacteria may be absorbed onto the ceramic surface at the initial stage of operation of the apparatus. Alternatively, microorganisms such as inorganic-accumulating autotrophic bacteria can be cultured suitably and multifaceted, and can be colonized in coexistence with both the inorganic and organic microorganisms. .

In addition, these microorganisms also settle on the surface of charcoal such as activated carbon that is mixed with the ceramic granules, and purify the incoming wastewater through the assimilation action of the microorganisms, but as mentioned above, the charcoal For example, the main purpose is to adsorb SS, residual oil, etc. in wastewater after primary treatment such as coagulation and sedimentation, and from this point of view, the filler 6 in the column 5 is made of ceramics. The purpose of the present invention can be achieved by blending 50 to 80% by weight of granules and 20 to 50% by weight of carbides, or by mixing both while firing in an inert gas, and allowing the microorganisms to colonize the mixture. becomes. Moreover, 7 in the figure is a recycled water treatment pipe for sending the waste water W to a reuse destination after purification.

Note that the device according to the present invention described above, as shown in the figure,
The treatment tank 1, flow meter 4, and column 5 may each be assembled as a single unit, but depending on the amount of wastewater, the arrangement may be changed as appropriate, such as by arranging a plurality of them in a row or by using only a plurality of columns 5. It is also possible to do so.

Next, an example in which wastewater W to be treated is highly treated using the apparatus according to the present invention described above will be described.

That is, wastewater to be treated W1~ discharged from an automobile factory
After each W4 is placed in a first wastewater treatment tank (not shown), an appropriate amount of an organic or inorganic flocculant is added to substantially precipitate the inorganic or organic substances in the wastewater.

Then, the sediment is discharged outside the tank and formed into a dry cake, and the remaining wastewater is stored in a wastewater treatment tank for secondary treatment, for example, the wastewater treatment tank 1 as shown.

The wastewaters W1 to W4 thus collected were subjected to an operation for removing CO0% SS and N-hexane from each of the wastewaters.

Table 1 (Raw wastewater) (Unit: ppm) To explain specifically, each of the sample wastewaters W1 to W4 was fed through the feed pipe 2 by driving the pump P, and
Adjust the flow rate with flow meter 4 and valve 3,
Furthermore, a column 5 having a diameter of 60 φ mm and a height of 1300 mm is filled with the optical fiber 6 in the feed pipe 2.
The treated wastewater is fed into the columns at a rate of 0.71 mm/mm, and the microorganisms fixed on the filler 6 perform a purifying action, and the treated wastewater is passed through the reclaimed water treatment pipe 7 connected to the column 5 and sent to rivers and other places. is discharged into the supply channel.

The treatment values shown in Table 2 are as shown in Table 1 above.
This shows the results after treating ~W4 with the above-mentioned treatment process, and as can be seen from this result, COD in wastewater, which was impossible with conventional microbial treatment methods,
It has been recognized that the removal action of S S % N hexane has been achieved.

Table 2 (after processing) (Unit: ppm) Next, other examples will be described.

Wastewater W5 containing a nonionic surfactant, two types of oil and fat soaps, and P discharged from the metal silica rod cutting process at an IC substrate factory was treated as described above, and then treated with a cylinder diameter of 100 φ.
The waste water W5 is fed into an O column 5 with a height of 1300 mm and a flow meter 4 at a flow rate of 2.01/mm, treated in the order of steps described above, and the treated water is passed through a reclaimed water treatment pipe 7 to reverse osmosis (RO). It was supplied to the plant for reuse.

Table 3 shows the results of this example.

Table 3 (unit: ρpm) Note that the microorganisms colonized in the filling material 6 according to the present invention described above, for example, the inorganic matter accumulating autotrophic bacteria or the organic matter nitrifying bacteria, are used to reduce the COD contained in repeatedly fed wastewater W, etc.
The pollutants that serve as sources are taken into the cells and accumulated, but they gradually become inactivated due to the assimilation of the microbial cells, and the pollutants themselves become sludge and are mixed in the filling material 6. Therefore, it is discharged to the outside of the reaction system together with SS and the like adsorbed on the carbide such as activated carbon mixed with the filling material 6.

At the breakthrough point of such microorganisms, the washed ceramic granules are used as a medium for culturing and propagating the organic matter nitrifying bacteria and inorganic matter accumulating autotrophic bacteria again.

(Effects of the Invention) As described above, the method and apparatus for treating wastewater using microorganisms according to the present invention provide a column with a porous structure formed by adding clay as a main component, adding a pore-forming material to the column, and firing the clay. Ceramic granules and carbide are mixed to form a medium for microbial propagation, and the medium is colonized with organic matter nitrifying bacteria and inorganic matter accumulating autotrophic bacteria to treat various wastewaters. The microorganisms on the ceramic granules, which have a vast surface area, are supplied with the oxygen and nutrients necessary for their reproduction, and are able to remove COD, etc. from the wastewater for a long period of time, which was considered impossible with conventional methods. It becomes something that you do.

Therefore, the recycled water after the treatment has a COD value of 10 ppm.
It can be used in reverse osmosis (RO) plants, etc., which would otherwise be unusable, and has a wide range of uses, and its effects are remarkable.

[Brief explanation of the drawing]

The drawings are an explanatory diagram of an apparatus and its system showing an embodiment of the present invention. l...Wastewater treatment tank, 2...Feeding pipe, 3...Valve, 4...Flow meter, 5...Column, 6...Filling material, 7...Recycled water treatment pipe, C...Compressor, P...Pump.

Claims (4)

[Claims] (1) The porous ceramic granules, which are mainly composed of clay and are made by adding pore-forming materials and firing, are filled in a column and contain at least pollutants in the wastewater flowing into the column. 1. A method for treating wastewater using microorganisms, which comprises colonizing microorganisms capable of treating charcoal, mixing the ceramic granules and charcoal, and then flowing wastewater into the column. (2) The method for treating wastewater using microorganisms according to claim 1, wherein the carbonized material is activated carbon. (3) The method for wastewater treatment using microorganisms according to claim 1, wherein the microorganisms are coexisting organisms of organic matter-digesting bacteria and inorganic matter-accumulating autotrophic bacteria. (4) A column having a size that accepts a certain amount of wastewater, and a clay filled inside the column as the main components,
porous ceramic granules obtained by adding a pore-forming material to the porous ceramic granules and firing them; microorganisms that are fixed to the ceramic granules and capable of treating pollutants in at least wastewater flowing into the column; and the ceramics. Wastewater treatment equipment using microorganisms consisting of carbonized material mixed with granular material.