JP3100096U - Sewage treatment system and continuous expansion culture device used for the system - Google Patents

Abstract

An object of the present invention is to maintain a sufficient organic substance resolution for a long period of time to reduce sludge and odor.
An aeration tank for temporarily storing sewage and treating sewage by reacting organic substances contained in the sewage with an effective microorganism group, and continuously cultivating the effective microorganism group in accordance with a preset program, and And a continuous expansion culture device 4 for administering an effective microorganism group to the wastewater in a plurality of times.
[Selection diagram] Fig. 1

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a sewage treatment system, and more particularly to a sewage treatment system capable of preventing odors, preserving water quality, reducing excess sludge, and the like by using effective microorganisms, and a continuous expansion cultivation apparatus used therein.
[0002]
[Prior art]
Conventionally, an activated sludge method has been known as a general sewage treatment method using an effective microorganism group. In this method, aeration (aeration) is performed on sewage to activate the action of aerobic microorganisms in the sewage, thereby decomposing organic substances in the sewage and purifying the water quality. Sewage treatment by this activated sludge method has excellent purification ability, but in order to suppress odor and reduce the amount of generated sludge, it is necessary to strengthen and improve effective microorganisms, and various attempts have been made for that purpose. Has been done.
[0003]
For example, Patent Literature 1 discloses an apparatus in which sludge discharged from a sedimentation basin is aerated and returned through a layer of a mixture of diatomaceous earth, perlite, etc., thereby achieving organic matter resolution and odor reduction. ing. Further, in Patent Document 2, a solution containing silicic acid in part or all of concentrated and extracted sludge is obtained by solid-liquid separation of sludge sent from a reaction tank mainly inhabiting aerobic bacteria. There is disclosed a sludge treatment method in which a sludge treatment is performed in which the aerobic state is maintained by aeration while being added, and the deodorizing effect is stably exhibited by aging.
[0004]
[Patent Document 1]
Japanese Patent Publication No. 62-016155, page 2, left column, lines 10 to 18 [Patent Document 2]
JP-A-12-084595, page 2, paragraph 0009
[0005]
[Problems to be solved by the invention]
However, in the above-mentioned conventional sewage treatment method, the effective microorganisms contained in the activated sludge mutually influence each other, and the organic matter resolution in the reaction tank decreases with time, and a sufficient odor reduction effect cannot be obtained. There is.
[0006]
The present invention has been made in view of such problems, and maintains a sufficient organic matter resolution for a long period of time, and can effectively reduce sludge and odor. It is an object to provide an expansion culture device.
[0007]
[Means for Solving the Problems]
The sewage treatment system according to the present invention is a sewage treatment method in which effective microorganisms are administered to sewage to decompose organic substances contained in sewage, while continuously culturing the effective microorganisms in a continuous expansion culture device, The effective microorganism group accommodated in the continuous expansion culture apparatus is divided into a plurality of times and administered to the wastewater.
[0008]
The sewage treatment system according to the present invention also has a reaction tank for temporarily storing sewage and reacting organic substances contained in the sewage with the effective microorganisms to treat the sewage, and continuously treating the effective microorganisms according to a preset program. And a continuous expansion culturing device for administering the effective microorganism group to the sewage in the reaction tank in a plurality of times.
[0009]
According to the present invention, the cultivation and introduction of the effective microorganism group is performed in a plurality of times, so that the continuous operation for a long period of time can be performed with a single setting without substantially deteriorating the effective microorganism layer. Will be possible. This makes it possible to effectively reduce sludge and odor.
[0010]
Further, the continuous expansion culture device according to the present invention includes a first culture solution tank containing a culture solution containing a first anaerobic bacterium and a second culture solution containing a culture solution containing a facultative anaerobic / aerobic bacterium. A culture solution tank, a second culture solution tank containing a culture solution containing a second anaerobic bacterium, a water supply means for supplying water to each of the first to third culture solution tanks, A first to a third liquid level detecting means for respectively detecting the liquid level of the culture solution contained in the third culture solution tank, and detecting the temperature of the culture solution contained in the first to third culture solution tanks; First to third temperature detecting means, first to third heating means for heating the culture solution contained in the first to third culture solution tanks, and the first to third culture solutions A culture tank provided with an input means for inputting the culture solution contained in the tank into the sewage at a predetermined rate, and the first to third heating according to a preset program. Controls the stage, characterized in that said effective microorganisms in several times to the reactor and a controller for controlling the closing means so as to put into the sewerage.
[0011]
According to this continuous expansion culture apparatus, in addition to the above-mentioned advantages, the effective microorganism group is cultured separately in the first to third culture solution tanks, so that culture is performed under environmental conditions including the most desirable temperature conditions. However, there is no mutual influence due to the mixing.
[0012]
[Embodiment of the invention]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a schematic configuration of a sewage treatment system according to an embodiment of the present invention.
Raw water, which is wastewater such as night soil, domestic wastewater, and industrial wastewater, is temporarily stored in a raw water pump tank 1, and is sequentially supplied to a subsequent processing unit by a pressure pump (not shown). The inflow adjusting tank 2 performs pretreatment for deodorization and decomposition of raw water, and adjusts an inflow amount of sewage supplied to a subsequent stage. The aeration tank (reaction tank) 3 temporarily stores the sewage supplied from the inflow adjustment tank 2, and under the predetermined aeration conditions, administers the effective microorganism group from the continuous expansion cultivation apparatus 4 to generate sewage. Causes chemical reactions and decomposes organic matter. The treated water discharged from the aeration tank 3 is supplied to the settling tank 5, where it is separated into sludge and supernatant. The settled sludge is appropriately treated by a sludge treatment device such as sludge dewatering gas (not shown). A part of the sludge may be withdrawn and returned to the inflow adjusting tank 2 and / or the aeration tank 3. In addition, the surplus sludge can be used as seed-seed sludge (seeding material) in other treatment facilities. After the supernatant is stored in the treated water tank 6, it is reused as middle water through the soil trench 7 and the like. This medium water is used as makeup water instead of clean water for the culture layer 8 described later, or is used as miscellaneous water. The medium water may be sprayed from a nozzle as defoaming water for eliminating bubbles generated when aeration is performed in the aeration tank 3.
[0013]
The continuous expansion culture device 4 includes a culture tank 8 and a controller 9. The culture tank 8 is configured, for example, as shown in FIG. That is, the culture tank 8 includes three independent culture solution tanks 11, 12, and 13. Water is supplied to each of the culture solution tanks 11 to 13 via water supply valves 14, 15, 16, and 17, and the culture solutions 21, 22, and 23 containing the effective microorganism groups in each of the culture solution tanks 11 to 13 are supplied with input valves. 18, 19, 20 and the charging pump 30 collectively charge the inflow adjusting tank 2 and the aeration tank 3. Circulation pumps 24, 25, and 26 for circulating culture solutions 21, 22, and 23 in the culture solution tanks 11 to 13 are provided. Further, in each of the culture solution tanks 11 to 13, heaters 27, 28, and 29 for individually heating the culture solutions 21 to 23, and thermostats 31 and 32 for detecting the temperature of the culture solutions 21 to 23, respectively. , 33 and electrode rods 34, 35, 36 for detecting the liquid surface of the culture solutions 21 to 23 in three stages. Further, each of the culture solution tanks 11 to 13 has a structure in which the inside is sealed, and air release valves 37, 38, and 39 are provided at the upper part.
[0014]
In the culture tank 8, three types of effective microorganism groups can be individually cultured in the respective culture solution tanks 11, 12, and 13, and mixed at a predetermined ratio. The controller 9 is provided with a setting panel (not shown), which can control the culturing time, the batch input time, the input amount, the culturing temperature, and the like.
[0015]
FIG. 3 is a flowchart showing the steps of the continuous expansion culture apparatus controlled by the controller 9.
First, a stock solution of effective microorganisms and molasses are separately charged into each of the culture solution tanks 11 to 13 (S1), and water is supplied (S2). Stop water supply when it is full. Subsequently, culturing is performed for a preset time and temperature (S3), and the first feeding is performed (S4). Thereafter, culturing (S5, S7, S9) and loading (S6, S8, S10) are repeated, and finally, the culture solution tanks 11 to 13 are washed (S11), and the apparatus enters a rest state (S12).
[0016]
As described above, when the input of the effective microorganism group is divided into four times, the operation can be performed only for about one week in one input, but the setting of the undiluted solution and the molasses takes one month. Continuous operation becomes possible, and labor saving of management work is promoted. Moreover, it has been confirmed that the effective microorganism layer hardly changes when the number of times is four. However, as the number of inputs increases, the propagation of various bacteria also increases. Therefore, it is desirable to limit the number of inputs to four at the maximum. After culturing and feeding a plurality of times, it is desirable to automatically wash the culture solution layers 11 to 13 to wash out various bacteria.
[0017]
The input ratio is, for example, that the first time is 70% of the whole culture, the second is 60% of the residual culture, the third is 50% of the residual culture, and the fourth is all of the residual culture. It is desirable to gradually reduce the amount of input as described above. With such an input method, the density of the microorganisms (the number or absolute amount of the effective microorganisms in the culture solution) can be kept average from the first to the fourth injection, and the variation can be prevented. It is.
[0018]
Desirable effective microorganisms used in this system include anaerobic bacteria such as lactic acid bacteria and photosynthetic bacteria, and facultative anaerobic and aerobic bacteria such as actinomycetes. Lactic acid bacteria suppress the propagation of harmful microorganisms and the rapid decay and decomposition of residual organic matter contained in wastewater, suppress the generation of odorous gas, promote fermentation, and generate effective nutrients. Photosynthetic bacteria synthesize vitamins and plant nutrients by feeding on hydrogen sulfide and secretions and organic matter from plant roots. Actinomycetes (Gram-positive actinomycetes) produce antibiotics to control mold and pathogens. For example, lactic acid bacteria (first anaerobic bacteria), actinomycetes (facultative anaerobic / aerobic bacteria), and photosynthetic bacteria (second anaerobic bacteria) are separately cultured in culture solution tanks 11 to 13, respectively. As a result, the culture is performed under environmental conditions including the most desirable temperature conditions, and there is no mutual adverse effect due to the mixing. At the time of introduction into sewage, it is desirable to mix and introduce anaerobic bacteria at a ratio of 70% or more and facultative anaerobic / aerobic bacteria at a ratio of 5 to 10%. If the anaerobic bacterium is 70% or more, the amount of aeration can be greatly reduced, and the running cost can be greatly reduced by reducing the amount of electric power by the aeration. When the wastewater contains a large amount of hydrogen sulfide, it is desirable that the proportion of photosynthetic bacteria among the anaerobic bacteria be larger than that of the lactic acid bacteria. It is more preferable to add 8 to 12 ppm of an enzyme, a mineral, or an amino acid because it promotes a decrease in sludge amount and further activates effective microorganisms.
[0019]
[Effect of the invention]
As described above, according to the present invention, the cultivation and introduction of the effective microorganism group are performed in a plurality of times, so that in a single setting, the effective microorganism layer is hardly degraded, and for a long period of time. The continuous operation over the entire range is enabled, and the effect of effectively reducing sludge and odor is achieved.
[Brief description of the drawings]
FIG. 1 is a block diagram of a sewage treatment system according to an embodiment of the present invention.
FIG. 2 is a schematic configuration diagram of a continuous expansion culture device in the same system.
FIG. 3 is a flowchart showing a process of sewage treatment using the same system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Raw water pump tank, 2 ... Inflow regulation tank, 3 ... Aeration tank, 4 ... Continuous expansion culture apparatus, 5 ... Sedimentation tank, 6 ... Treatment water tank, 7 ... Soil trench, 8 ... Culture tank, 9 ... Controller.

Claims (9)

In a sewage treatment system that administers effective microorganisms to sewage to decompose organic substances contained in sewage,
Sewage treatment, wherein the effective microorganism group is continuously cultured in a continuous expansion culturing device, and the effective microorganism group accommodated in the continuous expansion culturing device is administered to the sewage in a plurality of times. system. 2. The sewage treatment system according to claim 1, wherein the effective microorganism group accommodated in the continuous expansion culturing apparatus is administered to the sewage in a plurality of times while gradually decreasing the dose of the effective microorganisms. . A first anaerobic bacterium, a facultative anaerobic bacterium / aerobic bacterium, and a second anaerobic bacterium are separately cultured in the continuous expansion cultivator as the effective microorganism group, and these bacterium are isolated at a predetermined ratio. The sewage treatment system according to claim 1, wherein the sewage is administered to sewage. 4. The sewage treatment system according to claim 3, wherein the first and second anaerobic bacteria are administered to the sewage at a ratio of 70% or more and the facultative anaerobic / aerobic bacteria at a ratio of 5 to 10%. 5. The said 1st anaerobic bacterium is a lactic acid bacterium, said facultative anaerobic bacterium / aerobic bacterium is an actinomycete, and said 2nd anaerobic bacterium is a photosynthetic bacterium. A sewage treatment system according to any one of the preceding claims. A reaction tank for temporarily storing the sewage and reacting the organic matter contained in the sewage with effective microorganisms to treat the sewage;
Sewage, comprising: a continuous expansion culturing apparatus for continuously culturing the effective microorganisms according to a preset program and administering the effective microorganisms in a plurality of times to the sewage in the reaction tank. Processing system. The sewage according to claim 6, wherein the continuous expansion culturing device is configured to administer the effective microorganism group to the sewage in a plurality of times while gradually reducing a single dose to the reaction tank. Processing system. A first culture solution tank containing a culture solution containing a first anaerobic bacterium, a second culture solution tank containing a culture solution containing a facultative anaerobic / aerobic bacterium, and containing a second anaerobic bacterium A third culture solution tank containing a culture solution, water supply means for supplying water to each of the first to third culture solution tanks, and a water supply unit for the culture solution contained in the first to third culture solution tanks. First to third liquid level detecting means for detecting the liquid level, first to third temperature detecting means for detecting the temperature of the culture solution contained in the first to third culture solution tanks, First to third heating means for heating the culture solution contained in the first to third culture solution tanks, and the culture solution contained in the first to third culture solution tanks at a predetermined ratio. A culture tank having an input means for inputting to sewage,
In accordance with a preset program, the first to third heating means are controlled, and the charging means is controlled so that the effective microorganism group is charged into the sewage in the reaction tank in a plurality of times. A continuous expansion culture device comprising a controller. The continuous expansion culture apparatus according to claim 8, wherein the first anaerobic bacterium is a lactic acid bacterium, the facultative anaerobic bacterium / aerobic bacterium is an actinomycete, and the second anaerobic bacterium is a photosynthetic bacterium. .

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