JPS6094194A - Treating apparatus for organic waste water - Google Patents

Abstract

PURPOSE:To prevent flowing out of sludge and to treat org. waste water efficiently by providing a water-permeable screen between a biological layer and a discharging means for treated water and providing a filter layer comprising a floating filter medium to the rear side of the screen. CONSTITUTION:Crude water contg. org. substances such as sewage is fed from a feeding port 5 of the crude water as an upward flow and is allowed to contact with a sludge blanket layer 1 to decompose the org. substances microbiologically. The liquid contg. gases or fungus body after the microbiological decomposition is separated to treated water, gas, and sludge in a gas/solid separating apparatus 7, and the sludge is returned to a sludge blanket layer 1, and the gas is discharged from an outlet 9' through a gas trap 8. The treated water passed through the apparatus 7 contains SS components which are removed in the layer 4 of upper floating filter medium layer 4. During continuation of the treatment, deposition of microorganismic sludge is deposited on the space between filter media and the growth of microorganism is caused. Therefore, remaining org. substance is decomposed almost completely.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an organic wastewater treatment apparatus, and particularly to an organic wastewater treatment apparatus using microorganisms.

[Prior art]

In recent years, wastewater treatment methods using anaerobic microorganisms have been attracting attention as a treatment method for various organic wastewaters, as they do not require power costs for aeration equipment, etc., and can recover energy by obtaining methane gas from the treatment process. are collecting. In particular, research is being conducted on methods such as the anaerobic hearth (fixed bed) method, the anaerobic fluidized bed method, and the anaerobic sludge blanket method, which have higher treatment efficiency than conventional floating treatment methods. However, even in these processing methods,
It had the following problems and could not be said to be a sufficient treatment method.

Immediately, the sludge blanket method produces lumps of microorganisms (sludge).
Wastewater (raw water) is flowed upward to the treatment equipment in order to maintain the flow rate at a certain level, but it is vulnerable to fluctuations in the raw water volume load, and if the upward flow rate is not well controlled, sludge will flow out. Since the density of the sludge pellets formed differs depending on the water quality, there is a possibility of sludge flowing out.Furthermore, since the treatment is performed using a vortex method, if the contact efficiency between the sludge and raw water deteriorates, the treatment efficiency will deteriorate, etc. There are problems.

In addition, the fluidized bed type uses sand, zeolite, activated carbon, etc. as a carrier for the microorganism (sludge) fixation means, and flows the raw water in an upward flow to make it fluid, but if the raw water is overloaded, The thickness of the film of organisms attached to the carrier increases, and as a result, the apparent specific gravity of the carrier becomes small, sludge and carriers may flow out, circulation lines, water sprinklers, etc. may be clogged with sludge and carriers, and fluid flow may occur. Due to the nature of the floor, SS (suspended solids)
There are problems such as the components are difficult to remove.

Furthermore, the fixed bed method uses randomly filled stones, molded plastics, molded ceramics, etc., or a honeycomb-shaped filling material (nicum) as a means of fixing microorganisms (sludge), and the raw water is forced upward. For those that use fillers such as stones, molded plastics, and molded ceramics, the SS components and bacteria in the raw water can clog the F bed and cause short-circuit flow when operated for a long period of time. or may become partially overloaded. So, like a honeycomb, S
A type of filler that does not trap the S component is often used, but on the other hand, this method does not remove the SS component.
Post-processing to remove SS components is required.

Various studies have been conducted to solve these problems in the conventional technology.
A wastewater treatment device that combines an anaerobic filter 2 and an anaerobic filter 2 has been proposed. However, in such a device,
Although it is possible to prevent the sludge from flowing out of the sludge blanket 1, a new problem arises in that the upper filter 2 becomes clogged and backwashing cannot be carried out efficiently.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to prevent sludge from flowing out, efficiently treat organic wastewater, and maintain good treated water quality. [Structure of the Invention] In order to achieve this object, the treatment device of the present invention provides a treatment device for organic wastewater that can obtain organic wastewater. A screen is installed at the position of In the organic wastewater treatment apparatus, a screen through which water can pass is provided between the biological layer and the treated water extraction means, and a furnace layer made of a buoyant furnace material is provided on the lower surface side of the screen. The gist of the project is a wastewater treatment system.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to the drawings.

2 to 4 are schematic sectional views showing an example of the organic wastewater treatment apparatus of the present invention.

The embodiment shown in FIG. 2 relates to a sludge blanket type treatment device, and a screen 3 is installed between the sludge blanket layer 1 and the water surface 11 of the reaction tank of the treatment device. A furnace layer 4 made of floating furnace material is formed on the lower surface side. In FIG. 2, 5 is a raw water supply port, 6 is a treated water outlet, 7 is a gas-liquid-solid separator, 8 is a gas trap, and 9.9' is a gas outlet.

The floating furnace material constituting the furnace layer 4 on the lower surface side of the screen 3 is preferably one that has a specific gravity of about 0.1 to 0.9, is water-resistant, and preferably has a particle size of about 3 to 30 am.

In addition, the screen opening of 30 meshes is made smaller than the grain size of the furnace material used to prevent the furnace material from flowing out.

Further, in this embodiment, a drain water outlet 10 for backwashing is provided between the furnace layer 4 and the sludge blanket layer 1.

When treating organic wastewater using such a wastewater treatment device, first, raw water containing organic matter such as sewage or industrial wastewater is supplied in an upward flow from the raw water supply port 5 at the bottom of the device, and the sludge is removed. The blanket layer 1 is brought into contact with raw water, and the organic matter contained therein is decomposed by microorganisms and converted into gases such as methane gas and carbon dioxide gas. The liquid containing gas, bacteria, etc. that has passed through the sludge blanket layer 1 is separated into treated water, gas, and sludge in the gas-liquid solid separator 7. The sludge is returned to the sludge blanket layer I, and the gas is transferred to the gas trap. 8 and is discharged from the gas outlet 9'. The treated water that has passed through the gas-liquid-solid separator 7 still contains a certain amount of SS components. According to the apparatus of the present invention, this SS component is removed in the upper layer 4 of the floatable raw material. Furthermore, as the treatment continues, microbial sludge adheres and grows on the surface of the floating P material or in the gaps between the F materials, and the organic matter that has not been decomposed in the sludge blanket layer 1 is also removed in the furnace layer 4. K becomes almost completely decomposed.

Therefore, the treated water that has passed through the furnace layer 4 and the screen 3 contains almost no SS components and organic substances, and is discharged from the treated water outlet 6 as treated water of extremely good water quality.

In addition, in such a device, if the operation is continued for a long time, if the organic matter concentration in the raw water is high, or if the organic matter load in the device is high, the furnace layer 4 may become clogged over time. This may occur. In this case, the pulp 12 is opened and the treated water above the screen 3 is allowed to pass through the screen 3, thereby causing the floatable raw material to flow.
The deposits on the PIFt4 can be removed and discharged through the outlet 1o. In this way, the treated water present above (when the pulp 12 is opened, the screen 3) flows down by gravity efficiently and without requiring power for backwashing. ), the furnace layer 4 can be backwashed. After the backwash drain discharged from the outlet 1o is separated into solid and liquid, the supernatant water is circulated to a raw water tank (not shown). Note that during backwashing, the treated water above the screen 3 may be caused to flow downward using power.

FIG. 3 shows a different embodiment of the present invention, which relates to a fluidized bed processing apparatus. In the apparatus shown in FIG. 3, a screen 3 is installed at a position between the fluidized bed 21 and the water surface 11, and a furnace layer 4 made of floating furnace material is provided on the lower surface side of the screen 3.
is formed.

In this embodiment as well, raw water is introduced from the supply port 5 at the bottom of the device, treated in the fluidized bed 21, passed through the furnace bed 4 and the screen 3, and then taken out from the outlet 6. In addition, in order to ensure the upward flow rate necessary to form the fluidized bed 21, a part of the treated water taken out from the treated water outlet 6 is circulated and supplied to the raw water supply port 5 through a line 22 and a bonogu 23. Ru.

FIG. 4 shows yet another embodiment of the present invention, which relates to a fixed bed type processing apparatus.

This 411th embodiment has the same structure as the embodiment shown in FIG. 3, except that a filler 24 such as a honeycomb core is installed at the bottom of the device in place of the fluidized bed 21.
Like the embodiments shown in FIGS. 2 and 3, treated water of excellent quality can be obtained and backwashing is also easy.

The apparatus of the present invention can carry out more effective wastewater treatment by changing the amount, particle size, or load of the floating p-material. For example, in the sludge blanket type apparatus shown in FIG. 2, the sludge blanket layer 1 performs acid fermentation to convert organic substances into organic acids, and the furnace layer 4 consisting of one floating furnace material performs methane fermentation to convert the organic acids into methane gas. Fermentation is carried out, thereby making it possible to improve the quality of the treated water.

The apparatus of the present invention is not limited to the above-mentioned anaerobic treatment apparatus, but can also be suitably employed as an aerobic treatment apparatus, and can solve problems such as leakage of SS components. When carrying out aerobic treatment using the apparatus of the present invention, sufficient dissolved oxygen is given to the raw water, and in particular, in the case of a fluidized bed type apparatus or a fixed bed type apparatus, fine bubbles of oxygen-containing gas are created in the raw water. Extremely good aerobic treatment can be achieved by supplying . The method of supplying minute bubbles of oxygen-containing gas into raw water is unsuitable for sludge blanket-type equipment because it may destroy the blanket layer. It is preferable to supply

The present invention will be explained in more detail with reference to experimental examples below.

Experimental Example Organic wastewater was treated using a conventional sludge blanket type treatment apparatus as shown in FIG. 1 and a treatment apparatus of the present invention as shown in FIG.

All experimental equipment is made of acrylic, 20cIILφ×1
00mH1 capacity 31.4A. Also, as a floating furnace material, the average particle size is 3. A hollow plastic #furnace material (specific gravity 0.5) with Qmm and uniformity coefficient of 1.2 was used.

The raw water supplied to the treatment equipment is a mixture of glucose and organic acids.
An organic wastewater was used in which a nitrogen component and a phosphorus component were added to a mixture of 9 elements and a phosphorus component in a ratio of 100:5:1. In addition, during processing,
The pH was controlled at 6.6-7.6.

Figure 5 shows the COD value (×) of raw water, the COD value (・) of treated water obtained from the conventional device, the amount of SS component contained therein (mu), and the COD value of treated water obtained from the device of the present invention. (◯) and the changes in the amount of SS components contained therein (△) are shown.

From FIG. 5, it can be seen that in the apparatus of the present invention, the COD value and the amount of SS components contained in the treated water obtained are much lower than those in the conventional apparatus, and it is recognized that the quality of the treated water is extremely good. .

〔Effect of the invention〕

As described in detail above, the organic wastewater treatment apparatus of the present invention includes a screen provided between the biological layer and the treated water extraction means, and an F layer made of buoyant reactor material provided on the bottom side of the screen. In this case, the p-layer prevents the sludge from flowing out, and wastewater treatment can be carried out effectively. Moreover, in the p-layer, most of the SS components are removed and the organic matter decomposition reaction proceeds, so the treatment efficiency is increased and the quality of the treated water is significantly improved. Furthermore, it is highly adaptable to fluctuations in the amount or quality of raw water, and prevents a decrease in treatment efficiency due to overload.

When the present invention is applied to a fluidized bed type device, the carriers in the fluidized bed are prevented from flowing out, the circulation lines, water sprinklers, etc. are not clogged by the carriers, and the amount of sludge can be easily controlled.

Furthermore, backwashing can be performed extremely easily. The present invention can be effectively applied to any type of treatment equipment, including anaerobic treatment equipment, aerobic treatment equipment, sludge blanket type treatment equipment, fixed bed type treatment equipment, and fluidized bed type treatment equipment. Applicable. It can also be applied to existing equipment by making extremely simple modifications.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing a conventional sludge blanket type treatment device, FIGS. 2 to 4 show the treatment device of the present invention, FIG. 2 is a schematic sectional view of the sludge blanket type treatment device, and FIG. 4 is a schematic cross-sectional view of the fluidized bed treatment equipment.
The figure is a schematic cross-sectional view of a fixed-bed processing apparatus. FIG. 5 is a graph showing the results of the experimental example, where the vertical axis shows the COD value and the SS component amount, and the horizontal axis shows the number of operating days. ■...Sludge blanket, 2...Anaerobic filter, 3...Screen, 4...
・P layer, 5... Raw water supply port, 6... Raw water outlet,
10... Drain water outlet, 21... Fluidized bed, 2
4...Fixed floor. Agent Patent Attorney Tsuyoshi Shigeno

Claims (7)

[Claims] (1) In an organic wastewater treatment device that is equipped with a raw water supply means at the bottom and a treated water extraction means at the upper part and has a biological layer inside, a screen through which water can pass is provided between the biological layer and the treated water extraction means. 1. An organic wastewater treatment apparatus characterized in that a P layer made of a floating furnace material is provided on the lower surface side of the screen. (2) The treatment device according to claim 1, wherein the biological layer is a sludge blanket. (3) The treatment apparatus according to claim 1, wherein the biological layer is a fluidized bed. (4) The treatment apparatus according to claim 1, wherein the biological layer is a fixed bed. (5) The treatment device according to any one of claims 1 to 4, characterized in that a drainage means is provided between the biological layer and the F layer. (6) The processing apparatus according to any one of claims 1 to 5, wherein the floating furnace material has a specific gravity of 0.1 to 0.9. (7) The processing apparatus according to any one of claims 1 to 6, wherein the floating furnace material has a particle size of 3 to 30 m.