JP2002273491A - Combined collection treatment method and facility for organic liquid waste and night soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combined collection treatment method and a facility for organic liquid waste and night soil by which arbitrarily permit the production of compost can be arbitrarily adjusted and the amount of the excess sludge discharged outside can be made zero. SOLUTION: The dewater and separated liquid of the night soil and the septic tank sludge is subjected to biological treatment in a biological treatment process 2 and the execs sludge thereof is solubilized in an ozone reaction chamber 6. The formed ozone-solubilized sludge containing easily decomposable organic matter is subjected to the biological treatment in the biological treatment process 2, to annihilate the excess sludge. The sludge cake and the organic wastes are subjected to methane fermentation in a membrane type methane fermenter 10. The fermented sludge is composted in a composting process 12. A part or the entire amount of the fermented sludge is guided to the biological treatment process 2, by which the output of the compost is subjected to production curtailment regulation and part or the entire amount of the excess sludge is guided to the membrane type methane fermenter 10, to increase the output of the compost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a facility for the combined treatment of organic liquid waste and urine, and to compost the combined treatment of urine with organic liquid waste such as garbage and livestock waste. The present invention relates to a technology for performing a switching operation between a sludge composting facility and a sludge destruction facility while performing demand forecasting to promote effective use of sludge and to reduce the amount of excess sludge discharged outside the system to zero. .

[0002]

2. Description of the Related Art Conventionally, in the treatment of organic liquid waste, such as garbage and livestock waste, with urine, fermented sludge is dewatered and composted from the viewpoint of effective use of resources.
It is planned to return farmland.

[0003]

However, since the demand for compost fluctuates seasonally, many of them do not find a stable sales channel and are currently struggling to dispose of them. They may be disposed or incinerated, which is contrary to the effective use of resources.

The present invention has been made to solve the above problems,
By producing compost during the compost demand period and eliminating sludge during the unnecessary period, compost production can be adjusted arbitrarily and the amount of excess sludge discharged outside the system can be reduced to zero. It is an object of the present invention to provide a method and a facility for the combined treatment of urinary liquid waste and urine.

[0005]

According to a first aspect of the present invention, there is provided a method for treating organic liquid waste and urine, comprising the steps of dewatering human waste and septic tank sludge to form dewatered sludge. Separate into a dehydrated separated liquid, subject the dehydrated separated liquid to biological treatment in a biological treatment step, and solubilize excess sludge generated in the biological treatment step in an ozone reaction tank to produce easily decomposable organic matter. Is returned to the biological treatment process to remove excess sludge by biological treatment, dewatered sludge and organic waste are methane fermented in the methane fermentation process, and the fermented sludge generated in the methane fermentation process is composted in the compost process. The production of compost is controlled by reducing the amount of compost production by leading part or all of the fermented sludge to the biological treatment process, and leading part or all of the excess sludge to the methane fermentation process. Is intended to increase production adjusted.

[0006] With the above configuration, in order to increase production during the compost demand period, part or all of the surplus sludge is led to the methane fermentation step and methane fermented together with dewatered sludge and organic waste to reduce the amount of fermented sludge. Increase the amount of compost by directing the entire amount to the methane fermentation process.

In the unnecessary period of compost, in order to adjust production reduction, part or all of the fermented sludge is led to a biological treatment step for biological treatment, and the entire amount of excess sludge generated in the biological treatment step is led to an ozone reactor. The ozone reaction tank, causing the ozone oxidation reaction by air diffusion ozone at a rate of about 0.1~0.3g-O ₃ / g · SS in excess sludge.
Due to this ozone oxidation reaction, part or all of the excess sludge is tolerated, generating biodegradable organic substances that are easily used by microorganisms. The ozone-capable sludge is returned to the biological treatment step, and the sludge is eliminated (reduced in volume) by activated sludge treatment to reduce or eliminate compost production.

In this activated sludge treatment, a readily decomposable organic substance containing a volatile organic acid contained in fermented sludge is effectively used as an organic carbon source at the time of denitrification, so that other organic carbon sources such as methanol can be used. It is possible to treat night soil and septic tank sludge without adding or by greatly reducing the amount of addition, thereby improving the nitrogen removal performance and reducing the operating cost.

Therefore, it is possible to adjust the compost production by switching between the compost production operation and the excess sludge depletion operation while predicting the demand time and amount of the compost, and additionally, the excess sludge discharged outside the system. By setting the amount to zero, the flexibility as a system for building a resource recycling society can be improved.

According to a second aspect of the present invention, there is provided a method of combining organic liquid waste and urine, wherein a reduction in production and an increase in production are selected by using the amount of compost produced as an index.
According to the third aspect of the present invention, there is provided a method of treating organic liquid waste and urine in combination, which leads to a biological treatment step without dehydrating human waste and septic tank sludge.

According to a fourth aspect of the present invention, there is provided a combined treatment facility for organic liquid waste and urine, comprising a biological treatment means for biologically treating human waste and septic tank sludge, and contacting excess sludge generated by the biological treatment means with ozone. Ozone-reacting means for returning ozone-tolerant sludge containing easily decomposable organic matter generated by solubilization to biological treatment means, methane fermentation means for methane fermentation of dewatered sludge and organic waste, and methane fermentation means Composting means for composting the fermented sludge generated in the above, fermented sludge transfer means for leading the fermented sludge to the biological treatment means, surplus sludge transfer means for leading the excess sludge to the methane fermentation means, and fermented sludge amount and organisms for the compost means Fermentation sludge distribution adjusting means for adjusting the ratio of the amount of fermented sludge to the treatment means, and the ratio of the amount of excess sludge to the ozone reaction means and the amount of excess sludge to the methane fermentation means It is obtained by a surplus sludge distribution adjustment means for adjusting.

According to a fifth aspect of the present invention, there is provided the combined liquid waste and urine treatment facility according to the present invention, wherein the distribution amount in the fermentation sludge distribution adjusting means or the surplus sludge distribution adjusting means is determined by using the input compost stock amount as an index. It is provided with control means for controlling.

According to a sixth aspect of the present invention, there is provided the combined treatment facility for organic liquid waste and urine according to the present invention, wherein the human waste and the septic tank sludge are dewatered to be separated into dehydrated sludge and dehydrated separated liquid, and the dewatered separated liquid is sent to the biological treatment means. It is provided with a dewatering means for supplying and dehydrating sludge to the methane fermentation means.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1 and FIG. 2, the main treatment system for night soil and septic tank sludge is a pre-dehydration step 1 comprising dehydration means such as a screw press, and a biological treatment step comprising biological treatment means for performing activated sludge treatment such as a nitrification tank / denitrification tank. 2, an advanced treatment process 3 using ozone or activated carbon, and a disinfection tank 4 for charging a disinfectant connected by a main path 5, and a circulation path 7 having a first valve 7 between the ozone reaction tank 6 and the biological treatment step 2.
a is provided.

As shown in FIG. 2, in the ozone reaction tank 6, an air diffuser 6b is disposed below the tank 6a, an ozone generator 6c is connected to the air diffuser 6b, and the ozone generator 6b is discharged to the top of the tank 6a. The ozone treatment system 6d is connected.

The main treatment system for organic liquid waste such as garbage and livestock waste is a pretreatment step 8 such as a crusher, an acid fermentation tank 9 and a membrane type methane fermentation tank 10 constituting methane fermentation means. The dehydrator 11 and the composting step 12 are connected by a main path 13, and a second path is connected to the main path 13 on the upstream side of the dehydrator 11.
A valve 14 is provided. The membrane type methane fermentation tank 10 is provided with an immersion type membrane separation device or an external type membrane separation device. Further, a dewatered sludge transfer path 15 is provided between the pre-dehydration step 1 and the acid fermentation tank 9, and an excess sludge transfer path 17 having a third valve 16 is provided between the biological treatment step 2 and the acid fermentation tank 9,
Membrane permeated liquid transfer path 1 having ammonia stripping step 18 between membrane methane fermenter 10 and biological treatment step 2
9, a membrane separation sludge transfer path 21 having a fourth valve 20 is provided between the membrane type methane fermentation tank 10 and the biological treatment step 2. At the subsequent stage of the composting step 12, a product warehouse 22 for storing compost products is arranged.

The first valve 7 and the third valve 16 determine the amount of excess sludge introduced into the ozone reactor 6 and the amount of excess sludge introduced into the acid fermenter 9 of the methane fermentation means.
The second valve 14 and the fourth valve 20 constitute the excess sludge distribution adjusting means for adjusting the ratio of the excess sludge to the composting step 12 and the amount of the excess sludge leading to the biological treatment step 2. It constitutes a fermentation sludge distribution adjusting means for adjusting the ratio. 1st valve 7, 3rd valve 16, 2nd
The control device 23 that controls the opening and closing of the valve 14 and the fourth valve 20 receives the inventory amount of the compost in the product warehouse 22 as an input value, and uses the input value as an index for the first valve 7, the third valve 16, and the second valve. 14. Fourth valve 2
A function circuit is provided for opening and closing 0 or adjusting the opening thereof to control the amount of distribution in the fermented sludge distribution adjusting means or the excess sludge distribution adjusting means.

The operation of the above configuration will be described below. In the main treatment process of night soil and septic tank sludge, the coagulant is added in the pre-dehydration step 1 and then the manure and septic tank sludge is dewatered to be separated into pre-dewatered sludge and dewatered separated liquid.
To biological treatment step 2 for biological treatment (activated sludge treatment). The biologically treated water is subjected to advanced treatment in the subsequent advanced treatment equipment 3, and the treated water is discharged after disinfection in the disinfection tank 4. The human waste and septic tank sludge can be subjected to biological treatment in the biological treatment step 2 without passing through the pre-dehydration step 1.

The excess sludge generated in the biological treatment step 2 is led to the ozone reactor 6 through the circulation path 7a. In the ozone reactor 6, the ozonized air generated by the ozone generator 6 c is diffused from the air diffuser 6 b into the excess sludge, and the excess sludge is oxidized, decomposed, and solubilized with ozone, so that ozone containing easily decomposable organic matter is produced. Produces solubilized sludge. This ozone-solubilized sludge is returned to the biological treatment step 2 for activated sludge treatment, and excess sludge is eliminated by oxidizing and decomposing easily decomposable organic substances by microorganisms.

On the other hand, in the main processing step of the organic liquid waste, the pre-processing step 8 removes the unfermented fermentation products and removes the unfermented fermented waste to the organic liquid waste before supplying it through the dewatered sludge transfer path 15. The pre-dewatered sludge of the dewatering step 1 and the surplus activated sludge of the biological treatment step 2 supplied through the surplus sludge transfer path 17 are mixed, and the acid fermentation tank 9 and the membrane methane fermentation tank 1 are mixed.
At 0, acid fermentation and methane fermentation are performed sequentially.

In the membrane type methane fermentation tank 10, solid-liquid separation of the fermented sludge is performed by a membrane separation device, the separated membrane separated sludge is dewatered by a dehydrator 11 such as a screw press, and the dewatered cake is composted in a composting step 12. Then, the compost product is stored in the product warehouse 22.

Since the membrane permeate contains a high concentration of ammonia, the biological activity is inhibited by ammonia when returned to the biological treatment step 2 as it is. Therefore, the ammonia is removed in the ammonia stripping step 18 to reduce the concentration, and then returned to the biological treatment step 2 through the membrane permeate transfer path 19. The removed ammonia is separately collected and used effectively.

In the normal operation mode, the control unit 23 fully opens the first valve 7, fully closes the third valve 16, fully opens the second valve 14, and fully closes the fourth valve 20. In this state, the entire amount of the excess sludge in the biological treatment step 2 is circulated to the biological treatment step 2 after solubilization through the ozone reaction tank 6, and the entire amount of the membrane separation sludge passes through the dehydrator 11 to the compost step 1.
Flow into 2. In the normal operation mode, it is possible to open the third valve 16 with a small opening and supply a part of the excess sludge to the membrane methane fermentation tank 10 through the acid fermentation tank 9.
It is also possible to open the valve 20 at a small opening and supply a part of the fermented sludge to the biological treatment step 2 through the membrane separation sludge transfer path 21.

The control unit 2 is in the compost increase adjustment mode.
3 fully closes the first valve 7, fully opens the third valve 16,
The second valve 14 is fully opened, and the fourth valve 20 is fully closed.
In this state, the entire amount of the excess sludge in the biological treatment step 2 flows into the membrane methane fermentation tank 10 through the excess sludge transfer path 17, via the acid fermentation tank 9. The whole amount of membrane separation sludge is dehydrator 1
After that, it flows into the composting step 12. In the compost increase adjustment mode, open the first valve 7 with a small opening,
It is also possible to supply a part of the excess sludge to the ozone reactor 6.

In the compost reduction control mode, the controller 2
3 fully opens the first valve 7, fully closes the third valve 16,
The second valve 14 is fully closed, and the fourth valve 20 is fully opened.
In this state, the entire amount of fermented sludge in the membrane-type methane fermentation tank 10 flows into the biological treatment step 2, and the entire amount of excess sludge generated in the biological treatment step 2 passes through the circulation path 7a.
Flows into. In the ozone reactor 6, the ozonized air generated by the ozone generator 6 c is diffused from the air diffuser 6 b into the excess sludge, and the excess sludge is oxidized, decomposed, and solubilized with ozone, so that ozone containing easily decomposable organic matter is produced. Produces solubilized sludge.
The ozone-solubilized sludge is returned to the biological treatment step 2 for activated sludge treatment, and the easily decomposable organic matter is oxidized and decomposed by microorganisms to eliminate sludge (volume reduction). In the compost reduction control mode, it is also possible to open the second valve 14 with a small opening degree and supply a part of the fermented sludge to the composting step 12 via the dehydrator 11.

In the activated sludge treatment in the biological treatment step 2, the volatile organic acids and readily decomposable organic substances contained in the fermented sludge are effectively used as an organic carbon source for denitrification, so that methanol and the like can be used. It is possible to treat night soil and septic tank sludge without adding other organic carbon sources or with a significantly reduced amount.

The controller 23 selects and switches the normal operation mode, the compost increase production adjustment mode, and the compost reduction production adjustment mode as appropriate using the stock amount input from the product warehouse 22 as an index. For example, if the inventory amount is within the appropriate range, the normal operation mode is selected, and if the inventory amount exceeds the appropriate range and becomes excessive inventory, the compost reduction adjustment mode is selected, and the inventory amount falls below the appropriate range. If the stock becomes insufficient, select the compost increase adjustment mode. The appropriate range is changed every season, and the appropriate range is set high during the compost demand period, and the low appropriate range is set during the compost unnecessary period.

In the normal operation mode, the compost increase production adjustment mode, and the compost decrease production adjustment mode, the controller 23 controls the first valve 7, the third valve 16, and the second valve 1
4. Adjust the respective opening of the fourth valve 20 to adjust the distribution ratio of the amount of fermented sludge guided to the composting step 12 and the amount of fermented sludge guided to the biological treatment step 2, or the amount of excess sludge guided to the ozone reaction tank 6. The distribution ratio of the amount of excess sludge guided to the membrane methane fermenter 10 is adjusted.

[0029]

As described above, according to the present invention, during the compost demand period, part or all of the excess sludge is led to the methane fermentation step to increase the amount of fermentation sludge, and the whole amount is led to the methane fermentation step. In the unnecessary period of compost, part or all of the fermented sludge is led to the biological treatment process for biological treatment, and the excess sludge can be led to the ozone reactor during the unnecessary period of compost. And the sludge is eliminated (reduced in volume) by the activated sludge treatment in the biological treatment process. The compost production operation and surplus sludge production can be performed while forecasting the compost demand time and amount. Compost production can be adjusted by switching to depleted operation, and the amount of excess sludge discharged outside the system is reduced to zero, improving the flexibility as a system for building a resource recycling society It can be. In addition, the effective use of easily decomposable organic substances including volatile organic acids as organic carbon sources during denitrification does not require the addition of other organic carbon sources such as methanol, or significantly reduces the amount added. Thus, human waste and septic tank sludge can be treated, and the nitrogen removal performance can be improved and the operating cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a flow sheet showing a method of combining organic waste and urine in an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration of an ozone reaction tank in the same embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pre-dehydration process 2 Biological treatment process 3 Advanced treatment process 4 Disinfection tank 5 Main path 6 Ozone reaction tank 6a Tank body 6b Air diffuser 6c Ozone generator 6d Waste ozone treatment system 7 First valve 7a Circulation path 8 Pretreatment step 9 Acid fermentation tank 10 Membrane-type methane fermentation tank 11 Dehydrator 12 Composting step 13 Main path 14 Second valve 15 Dewatered sludge transfer path 16 Third valve 17 Excess sludge transfer path 18 Ammonia stripping step 19 Membrane permeate transfer path 20 Fourth Valve 21 Membrane-separated sludge transfer route 22 Product warehouse 23 Control device

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tetsuya Yamamoto 2-47, Shishitsuhigashi 1-chome, Namiwa-ku, Osaka-shi, Osaka F-term (reference) 4D004 AA03 BA04 CA04 CA13 CA18 CB04 DA02 DA16 DA20 4D059 AA01 AA02 BA01 BC00 BE26 BK12 CC01 DA43 DA61 EB20

Claims (6)

[Claims] 1. Dewatering human waste and septic tank sludge to separate them into dehydrated sludge and dehydrated separation liquid, subjecting the dewatered separation liquid to biological treatment in a biological treatment step, and solubilizing excess sludge generated in the biological treatment step in an ozone reaction tank. To produce easily degradable organic matter, return this ozone-capable sludge to the biological treatment process, and remove the excess sludge by biological treatment.The methane fermentation process converts the dehydrated sludge and organic waste into methane fermentation. The fermented sludge generated in the methane fermentation process is composted in the composting process. Part or all of the fermented sludge is led to the biological treatment process to reduce the amount of compost production and adjust the amount of surplus sludge. A method for combining organic liquid waste and urine, wherein the production of compost is adjusted by increasing the amount of compost by introducing part or the entire amount to a methane fermentation process. 2. The method according to claim 1, wherein the production reduction adjustment and the production increase adjustment are selected using the inventory of the produced compost as an index. 3. The method according to claim 1, wherein the human waste and the septic tank sludge are led to the biological treatment step without dehydration. 4. Biological treatment means for biologically treating night soil and septic tank sludge, and excess sludge generated by the biological treatment means being solubilized by contact with ozone to produce ozone-capable sludge containing easily decomposable organic matter. Ozone reaction means returned to biological treatment means, methane fermentation means for methane fermentation of dewatered sludge and organic waste, compost means for composting fermentation sludge generated by methane fermentation means, and biological treatment means for fermentation sludge Fermentation sludge transfer means to lead to, surplus sludge transfer means to guide the excess sludge to methane fermentation means, and fermentation sludge distribution adjustment means to adjust the ratio of the amount of fermentation sludge to the compost means and the amount of fermentation sludge to the biological treatment means Organic sludge distribution adjusting means for adjusting the ratio of the amount of excess sludge led to the ozone reaction means and the amount of excess sludge led to the methane fermentation means. Liquid waste and urine combined processing equipment. 5. The organic organic solvent according to claim 4, further comprising control means for controlling a distribution amount in the fermentation sludge distribution adjusting means or the surplus sludge distribution adjusting means using the input compost stock amount as an index. Combined treatment equipment for liquid waste and urine. 6. A dewatering means for dewatering human waste and septic tank sludge to separate it into dewatered sludge and dewatered separation liquid, supplying the dewatered separation liquid to biological treatment means, and introducing dewatered sludge to methane fermentation means. The combined treatment facility for organic liquid waste and urine according to claim 4.