JP2010115584A - Septic tank sludge treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means which enables independent, low-cost, and easy treatment of sludge, generated in a septic tank in a home or the like, in a home or the like. <P>SOLUTION: The septic tank 1 is provided with a sludge treatment device 3 for treating surplus sludge 2. The sludge treatment device 3 is equipped with a sludge pump 4, a treatment container 5, a sawdust feeder 6, and a filter 7 as main components. The sludge pump 4 transfers the surplus sludge 2 in the septic tank 1 to the treatment container 5 through a sludge supply passage 8. The sawdust feeder 6 supplies sawdust to the treatment container 5. While a mixture of the sludge 2 and the sawdust is agitated by an agitator 11 in the sludge treatment container 5, moisture is removed by the filter 7 to form a sludge mixture. The sludge mixture from which moisture has been removed can be used as a fertilizer for farm products and the like. A filtrate is returned to the septic tank 1 through a filtrate return passage 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a septic tank sludge treatment apparatus that individually treats sludge in a septic tank that purifies living sewage in a household or a small-scale establishment for each septic tank.

In recent years, in areas where public sewerage is not provided, small septic tanks that biochemically purify living sewage such as homes or small-scale establishments are becoming widespread. In this type of small septic tank, in general, various living sewage such as human waste, cooking waste water, bathtub drainage, etc. are aerated to purify using aerobic microorganisms (for example, Patent Document 1).
Japanese Patent Laying-Open No. 2003-211126 (paragraph [0010], FIG. 1)

  By the way, in this kind of septic tank, sludge (activated sludge) is generated with purification of sewage. This sludge must be removed and treated periodically, but it is not easy for the owner or manager of the septic tank to individually treat the sludge. Therefore, at present, a specialized sludge treatment company collects sludge from each septic tank using, for example, a vacuum car or the like and collectively processes it at a large sludge treatment plant. For this reason, there is a problem that the owner or the manager of the septic tank must pay a sludge treatment cost to a sludge treatment company on a regular basis.

  In addition, if the amount of sludge treatment increases with the spread of this type of septic tank, the treatment capacity of the sludge treatment plant will eventually become insufficient, and smooth treatment of sludge becomes difficult. However, even when trying to construct a new sludge treatment plant, construction is often difficult due to opposition movements of residents around the planned construction site. Moreover, even if it can be constructed, a large construction cost (especially the cost of environmental measures equipment) is required, which increases the sludge treatment cost. Therefore, if the owner or manager of the septic tank can treat sludge individually, such problems will be solved, but at present, the owner of the septic tank can easily treat sludge individually at low cost. There is no way to make it possible.

  The present invention was made to solve the above-mentioned conventional problems, and the sludge generated in a septic tank that biochemically purifies living sewage such as homes or small-scale establishments is owned by the owner of the septic tank. Alternatively, it is an object to be solved to provide a means that enables an administrator to independently perform processing at low cost and easily.

  The septic tank sludge treatment apparatus according to the present invention made to solve the above problems is as follows. (I) An additive comprising a water-insoluble fine granular material or powdery substance in which a stirrer is disposed and biodegradable. (Ii) a sludge pump for transferring a part of the sludge (excess sludge) deposited in the lower part of the septic tank to the treatment container through the sludge transfer passage, and (iii) accommodated in the treatment container. A filter for filtering the sludge and additive mixture, and (iv) a filtrate return passage for returning the filtrate of the filter to the septic tank.

  The septic tank sludge treatment apparatus according to the present invention preferably includes an additive supply device for supplying the additive to the treatment container. As said additive, it is preferable to use the fine particle or powder of wood, for example, large sawdust. Further, rice husk may be used as an additive. The septic tank is preferably a combined septic tank that biochemically purifies various sewage at home or small-scale establishments by microorganisms.

  According to the septic tank sludge treatment apparatus according to the present invention, a compact and simple structure comprising a processing vessel equipped with a stirrer, a sludge pump, a filter, etc. in the vicinity of the septic tank in each household or small-scale business establishment. The excess sludge in the septic tank can be individually treated at low cost and easily. In addition, since the additive is made of a biodegradable material, that is, a material that becomes humus by biodegradation, a mixture of almost solid sludge dehydrated by a filter and an additive can be used as a fertilizer for, for example, agricultural crops. it can.

Hereinafter, preferred embodiments of the present invention (best mode for carrying out the present invention) will be specifically described with reference to the accompanying drawings.
As shown in FIG. 1, the septic tank 1 utilizes aerobic microorganisms by aeration treatment of various living sewage such as human waste, cooking waste water, bathtub drainage, etc. generated at home or small-scale establishments. It comes to purify. That is, the septic tank 1 is a merged processing septic tank. The water purified by the microorganisms overflows from the upper part of the septic tank 1 and is discharged into a drainage groove (not shown). The BOD (biochemical oxygen demand) removal rate of the septic tank 1 is 90% or more, and the BOD of purified water is 20 mg / l or less. The septic tank 1 may be provided with, for example, an aeration tank that blows air through an air diffuser to aerate sewage and a precipitation tank that precipitates sludge 2, and the aeration tank and the precipitation tank are integrated. It may be what was done.

  Sludge 2 (activated sludge) is precipitated at the bottom of the septic tank 1 (sedimentation tank). The majority of microorganisms that purify the sewage live in the sludge 2. In the septic tank 1, the amount of sludge 2 stays with the purification of the sewage, but the excess sludge 2 is appropriately extracted by the sludge treatment device 3 and processed. Therefore, the staying amount of the sludge 2 in the septic tank 1 is kept approximately constant. In addition, the average sludge density | concentration (MLSS) in the septic tank 1 is about 0.3-0.5 mass%.

  The sludge treatment apparatus 3 is provided with a sludge pump 4, a treatment container 5, a large sawdust feeder 6, and a filter 7 (filter) as main components. Here, the sludge pump 4 passes the excess sludge 2 in the septic tank 1 through a sludge transfer passage 8 whose tip is open at the bottom of the septic tank 1, for example, the volume of the processing vessel 5. Is transferred to the processing container 5 by 1/2 to 2/3 of the above. The moisture content of the sludge 2 is about 90 to 90.5%. Further, the large sawdust feeder 6 supplies a large sawdust having a preset mass or volume to the processing container 5. Here, the large sawdust is supplied to the solid content of the sludge 2 in the processing container 5 at a mass ratio of 1/2 to 2/1, for example.

  Note that the large sawdust feeder 6 may not be provided, and an appropriate amount of large sawdust may be manually put into the processing container 5. In this way, the sludge treatment apparatus 3 can be simplified.

  A stirrer 11 driven by a motor 10 is disposed in the processing container 5. The stirrer 11 includes a rotating shaft 11a that is rotationally driven by the motor 10 and an agitating claw 11b attached to the rotating shaft 11a. Then, the stirrer 11 stirs the mixture of sludge 2 and large saw dust (hereinafter referred to as “sludge mixture”) for a single treatment contained in the processing vessel 5.

  The filter 7 is disposed at the bottom of the processing container 5, separates water as a filtrate from the sludge mixture in the processing container 5, and returns the filtrate to the septic tank 1 through the filtrate return passage 12. As described above, the sludge mixture contains large sawdust, but this large sawdust functions as a filter, and therefore promotes filtration in the filter 7, that is, separation of moisture from the sludge mixture.

  Thus, in the processing container 5, while the sludge mixture is stirred by the stirrer 11, moisture is removed by the filter 7, and finally, a sludge mixture in which the large sawdust and the sludge 2 are almost uniformly distributed is formed. . The sludge mixture from which moisture has been removed in this way has a moisture content of about 75 to 85%, and is solidified to the same extent as large sawdust wet with water. Therefore, the sludge mixture from which moisture has been removed can be easily taken out from the processing container 5 manually.

  The almost solidified sludge mixture taken out from the processing vessel 5 is composed of organic sludge 2 composed of microorganisms and excreta thereof, and large sawdust that is biodegradable organic matter. If it is sprayed or buried in the soil, it will become humus over time. Further, the sludge 2 and the large sawdust contain components or nutrients that promote plant growth. Furthermore, since the sludge 2 is produced from living sewage, it does not substantially contain harmful substances such as heavy metals. Therefore, the sludge mixture can be used as a fertilizer for agricultural products.

  In this embodiment, large sawdust is used as an additive to the sludge 2, but the large sawdust is merely an example, and it is needless to say that the additive is not limited to the large sawdust. Any additive may be used as long as it is a water-insoluble fine particulate or powder that can be biodegraded. For example, rice husks, ground wood, ground plant leaves or stems may be used as additives.

  As described above, according to the sludge treatment apparatus 3 according to the embodiment of the present invention, the sludge pump 4, the treatment container 5 provided with the stirrer 11, and the large sawdust feeder in the vicinity of the septic tank 1 in each home or small-scale business establishment. 6. With a compact and simple structure composed of the filter 7 and the like, the excess sludge in the septic tank 1 can be individually treated at low cost and easily, and sludge treatment costs can be saved. Moreover, when cultivating crops and the like, the purchase cost of fertilizer can be saved by using the sludge mixture as a fertilizer.

It is a schematic diagram which shows the structure of the septic tank provided with the sludge processing apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Septic tank 2 Sludge 3 Sludge processing apparatus 4 Sludge pump 5 Processing container 6 Large sawdust feeder 7 Filter 8 Sludge transfer passage 10 Motor 11 Stirrer 11a Rotating shaft 11b Stirring claw 12 Filtrate return passage

Claims (6)

A processing vessel in which a stirrer is disposed and receives an additive composed of a water-insoluble fine granular material or powdery material capable of biodegradation;
A sludge pump that transfers a portion of the sludge that has settled in the lower part of the septic tank to the treatment container through a sludge transfer passage;
A filter for filtering the mixture of sludge and additives contained in the processing vessel;
A septic tank sludge treatment apparatus comprising a filtrate return passage for returning the filtrate of the filter to the septic tank.   The septic tank sludge treatment apparatus according to claim 1, further comprising an additive supplier for supplying the additive to the treatment container.   The septic tank sludge treatment apparatus according to claim 1 or 2, wherein the additive is a fine particle or powder of wood.   The septic tank sludge treatment apparatus according to claim 3, wherein the additive is large sawdust.   The septic tank sludge treatment apparatus according to claim 1 or 2, wherein the additive is rice husk.   The septic tank sludge according to any one of claims 1 to 5, wherein the septic tank is a combined treatment septic tank that biochemically purifies living sewage in a home or a small-scale business with microorganisms. Processing equipment.

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