JP3673072B2 - Waste treatment equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a waste treatment apparatus that biologically treats sewage sewage using energy generated when an organic waste is subjected to a methane fermentation treatment.
[0002]
[Prior art]
Conventionally, sewage sewage such as manure and septic tank sludge is separated from the residue with a screen removal device such as a screen, and then subjected to biological treatment such as nitrification / denitrification reaction and oxidative decomposition reaction by microorganisms. The solid waste liquid and the treated water are separated into solid and liquid to purify the sewage sewage, while the residue and the solid separated into solid and liquid are dehydrated and incinerated.
[0003]
However, if the residue and solids are incinerated, the thermal energy generated during the incineration cannot be used effectively, and the carcinogen dioxin may be generated when the residue is incinerated. The process is complicated and the incinerator becomes large and complicated.
[0004]
For this reason, attempts have been made to perform RDF treatment in which the solid material after biological treatment is appropriately treated, such as composting, and the residue is appropriately treated together with plastic, garbage, etc., and formed into pellets to form solid fuel. It has been.
[0005]
However, there are many organic substances adhering to the residue and, for example, a bad odor is generated during the RDF treatment, so countermeasures against the bad odor are necessary, and the RDF treatment apparatus becomes complicated and large.
[0006]
On the other hand, conventional waste treatment equipment that treats organic waste such as garbage includes synthetic resin films, plastics, foamed polystyrene, and other contaminants that are extremely difficult to decompose. A configuration is known in which impurities are removed after crushing and then processed by methane fermentation or the like.
[0007]
However, because organic substances that can be decomposed by microorganisms adhere to the contaminants removed by crushing, they produce a bad odor when processing the contaminants and are unsanitary, and the appearance is poor and the surrounding environment is deteriorated. .
[0008]
[Problems to be solved by the invention]
As described above, in the waste treatment apparatus that performs RDF treatment on the residue in the sewage sewage during the treatment of the sewage sewage, the odor is generated during the RDF treatment. Is complicated and large. In addition, conventional waste treatment equipment that disintegrates organic wastes such as garbage and removes foreign matters to treat methane and generates odors when processing foreign matters. However, it is unsanitary and has a problem of deteriorating the surrounding environment.
[0009]
In view of the above problems, an object of the present invention is to provide a waste treatment apparatus capable of efficiently treating manure sewage and organic waste without damaging the surrounding environment.
[0010]
[Means for Solving the Problems]
The waste treatment apparatus according to claim 1, wherein the residue separating means for separating the residue from the waste sewage, and the organism for biologically processing the waste sewage from which the residue from the residue separating means has been removed. Processing means, mixing means for preparing the mixture by stirring and mixing the residue and the biodegradable organic waste, residue removing means for removing the residue from the mixture, Methane fermentation means for performing methane fermentation treatment on the mixture from which the residue has been removed from the residue removal means. The sewage sewage from which the residue is separated by the residue separating means is biologically treated by the biological treatment means, and the residue separated by the residue separating means and the biodegradable organic waste and The mixture is stirred and heated while being heated by the mixing means to prepare a mixture, and this mixture is subjected to methane fermentation by the methane fermentation means. For this reason, the organic matter adhering to the residue separated from the urine wastewater is eluted with the viscosity lowered by the mixing means, and the organic matter eluted together with the organic waste is processed, so the organic matter remains attached. Is not discharged out of the system, and the residue is easily and efficiently processed without deteriorating the surrounding environment, and the processing cost is reduced by the effective use of methane gas generated by methane fermentation.
[0011]
The waste treatment apparatus according to claim 2 is the waste treatment apparatus according to claim 1, wherein the fermentation treatment product subjected to the methane fermentation treatment by the methane fermentation means is dehydrated and separated into a filtrate and a dehydrate. And a filtrate returning means for returning the water to the biological treatment means. Then, the fermented product obtained by the methane fermentation treatment by the methane fermentation means is dehydrated and separated by the dehydration means, and the obtained filtrate is returned to the biological treatment means by the filtrate return means to perform biological treatment together with the manure sewage. Therefore, the filtrate containing untreated pollutants in methane fermentation can also be highly purified by biological treatment using the energy obtained in methane fermentation, and efficiently and highly manure wastewater and organic Waste is processed.
[0012]
The waste treatment apparatus according to claim 3 is the waste treatment apparatus according to claim 1 or 2, further comprising a crushing means for crushing the organic waste before subjecting the organic waste to methane fermentation treatment by the methane fermentation means. . Since organic waste is crushed by a crushing means and then subjected to methane fermentation, even if impurities that are difficult to biodegrade are mixed in the organic waste, the waste is crushed together with the organic waste. By making it a uniform composition, the progress of the subsequent methane fermentation treatment is promoted.
[0013]
According to a fourth aspect of the present invention, there is provided the waste treatment apparatus according to the second or third aspect, wherein the auxiliary treatment means for adding the polymer flocculant and the phosphorus removing agent when dehydrating and separating by the dehydration means is provided. It is provided. And, when the mixture subjected to the methane fermentation treatment by the methane fermentation means is dehydrated and separated by the dehydration means, the polymer flocculant and the phosphorus removing agent are added by the auxiliary agent addition means. Efficiently and easily dehydrated, soluble organic matter and phosphorus that are difficult to biodegrade are also coagulated and separated, and highly manure wastewater and organic waste are treated.
[0014]
The waste treatment apparatus according to claim 5 is the waste treatment apparatus according to any one of claims 2 to 4, wherein the filtrate returning means includes an aerobicizing means for bringing the filtrate into an aerobic state, and the aerobicizing means. A coagulating means for adding an aggregating agent to the filtrate in an aerobic state and coagulating it, and a sludge removing means for solid-liquid separating the filtrate coagulated by the coagulating means are provided. Then, after the filtrate obtained by the dehydrating means is aerobic by the aerobic means and the flocculant is added by the aggregating means, the flocculant is subjected to agglomeration treatment, followed by solid-liquid separation by the sludge removing means and the biological treatment means. In order to return to the factory, the organic and inorganic substances solubilized by methane fermentation, which are difficult to remove by biological treatment, are aerobic in advance, and the undegraded soluble organic substances and remaining inorganic substances are removed by agglomeration. The load on the biological treatment means is reduced and the purification process is highly efficient.
[0015]
The waste treatment apparatus according to claim 6 is the waste treatment apparatus according to any one of claims 2 to 5, wherein the sewage sewage from which the residue from the residue separation means has been separated is agglomerated to cause agglomerated separation water and agglutination There is provided a flocculating / separating means for solid-liquid separation into sludge and charging the flocculated / separated water into the biological treatment means, and the filtrate returning means returns the filtrate to the biological processing means via the flocculating / separating means. Then, the filtrate that has been dehydrated and separated after the methane fermentation treatment is returned to the coagulation separation means together with the urine sewage from which the residue from the residue separation means has been separated via the filtrate return means, and the coagulated separation water that has been aggregated and solid-liquid separated. Is added to biological treatment means, so soluble organic substances and inorganic substances that are difficult to purify by biological treatment are agglomerated and separated in advance and biological treatment is performed, so that manure wastewater and organic waste are treated with high efficiency. The
[0016]
A waste treatment apparatus according to a seventh aspect is the waste treatment apparatus according to the sixth aspect, wherein the aggregating means agglomerates in an alkaline atmosphere and the aggregating and separating means agglomerates in an acidic atmosphere. Since the filtrate coagulated and separated in the alkaline atmosphere after the methane fermentation treatment is coagulated in the acidic atmosphere together with the urine sewage by the coagulation separation means, the soluble organic substances and the remaining inorganic substances after the methane fermentation treatment are efficiently aggregated in the alkaline atmosphere. In addition to the removal, the remaining soluble organic substances and the remaining inorganic substances are agglomerated and removed in an acidic atmosphere, so that wastewater from urine and organic waste are treated with high efficiency.
[0017]
A waste treatment apparatus according to claim 8 is the waste treatment apparatus according to any one of claims 1 to 7, further comprising a cleaning unit that cleans the residue removed by the residue removal unit.
[0018]
Further, since the residue removed by the residue removing means is washed by the washing means, the residue is formed into a pellet, for example, into a solid fuel or incinerated, and does not produce a bad odor. Becomes easy.
[0019]
The waste treatment apparatus according to claim 9 is the waste treatment apparatus according to claim 8, further comprising a residue cleaning liquid transporting means for transporting the residue cleaning liquid obtained by washing by the cleaning means to the methane fermentation means. Is.
[0020]
Then, in order to transport the residue washing liquid obtained by washing the residue in the washing means to the methane fermentation means in the residue washing liquid conveying means, in the methane fermentation means into which the mixture having a low water content from the mixing means flows. As the moisture content of the mixture increases, the methane fermentation process becomes smoother and the fermentation proceeds to some extent by the mixing means, and fermentation promoting components such as nutrient sources of microorganisms contained in the mixture are contained in the residue washing liquid. Therefore, the efficiency of the methane fermentation treatment is improved by supplementing the fermentation promoting component during the methane fermentation.
[0021]
The waste treatment apparatus according to claim 10 is the waste treatment apparatus according to claim 8, further comprising a residue cleaning liquid transporting means for transporting the residue cleaning liquid obtained by cleaning by the cleaning means to the mixing means. It is.
[0022]
And since the residue washing liquid obtained by washing the residue by the washing means is conveyed to the mixing means by the residue washing liquid conveying means, the residue having a low moisture content and the moisture content separated by the residue separating means The moisture content in the mixing means where low organic waste is mixed is increased, the mixing with the residue and organic waste in the mixing means is smooth, and some degree of fermentation is progressing in the mixing means In addition, fermentation promoting ingredients such as nutrient sources for microorganisms contained in the mixture are contained in the residue washing liquid, so that fermentation in the mixing means further progresses and the efficiency of methane fermentation treatment in the methane fermentation means in the subsequent process is improved. To do.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the configuration of an embodiment of the waste treatment apparatus of the present invention will be described with reference to FIG.
[0024]
In FIG. 1, 1 is a sediment separating means, and this sediment separating means 1 is constituted by combining, for example, a screen having a mesh width of about 1 mm, a screw press, etc. in multiple stages. Is separated into solid residue and liquid stock solution.
[0025]
The residue separation means 1 is connected to the aggregation separation means 2. This aggregating / separating means 2 is a first aggregating agent adding means for adding an aggregating agent to the undiluted solution after the residue is removed from the urinary sewage by the scum separating means 1, and the pH is measured appropriately. A first flocculation tank provided with a first pH control means for controlling the pH to be acidic by adding a pH adjusting agent such as sodium oxide and the stock solution coagulated in the first flocculation tank are subjected to solid-liquid separation. It is comprised with 1st solid-liquid separation means, such as a screen, a sedimentation-separation apparatus, and membrane separation. In addition, as the flocculant, an inorganic flocculant such as ferric chloride is used.
[0026]
Further, the biological treatment means 3 for purifying the separated water flowing from the first solid-liquid separation means in the biological nitrification denitrification reaction is connected to the coagulation separation means 2. In addition, this biological treatment means 3 is comprised by two tanks, the structure which produces nitrification denitrification reaction in one tank, the tank which denitrifies, and the tank which carries out nitrification treatment, and also has an aeration means and is aerobic. It is good also as a structure etc. which added the tank which carries out an aerobic microorganism process with microorganisms.
[0027]
The biological treatment means 3 is connected to a second solid-liquid separation means 4 for solid-liquid separation of the treatment liquid after the biological nitrification denitrification treatment. The second solid-liquid separation means 4 can be any solid-liquid separation method such as filtration separation using a screen or a membrane or sedimentation separation treatment after adding a flocculant and aggregating treatment. The filtrate separated from the solid and the liquid is discharged out of the system as treated water, and the sludge separated from the solid and the liquid is partially returned to the biological treatment means 3 or separately treated as fertilizer.
[0028]
On the other hand, 5 is a crushing means. This crushing means 5 is very difficult to biodegrade in waste by finely crushing waste containing biodegradable organic waste such as garbage and agricultural and fishery waste. It is equipped with a crushing device that breaks or crushes various kinds of synthetic resin films, plastics, polystyrene foam, glass, metal fragments, and the like.
[0029]
A mixing means 6 is connected to the crushing means 5. Further, the mixing means 6 is connected to a residue transporting path 7 through which the residue separated by the residue separating means 1 is conveyed and charged. Then, the mixing means 6 appropriately heats the residue transported in the residue transport path 7 and the crushed waste from the crushing means 5 to, for example, about 55 ° C. while adding moisture. And mix. Note that steam is preferably used for addition of water and heating. By using steam, it is not necessary to add water and heat it separately by heating means, and heating and stirring can be performed efficiently.
[0030]
Further, the residue removing means 8 is connected to the mixing means 6. The residue removing means 8 separates and removes impurities in the residue and waste from the mixture prepared by stirring and mixing the residue and waste in the mixing means 6. The removed residue and contaminants are separately formed into pellets, for example, into solid fuel, or incinerated.
[0031]
Further, the residue removing means 8 is connected to a methane fermentation means 9 for performing a methane fermentation treatment on the mixture from which the residue and impurities are removed. This methane fermentation means 9 carries out a methane fermentation process of an organic substance with methane bacteria etc., stirring suitably at heating, for example, 55 degreeC. The methane fermentation means 9 is provided with methane gas recovery means for recovering the generated methane gas. The recovered methane gas is used for power generation and the like, and is used as operating energy for the treatment of manure wastewater and organic waste.
[0032]
The methane fermentation means 9 is connected to a dehydration means 11 such as a centrifuge for dehydrating and separating a fermented product obtained by subjecting the mixture to a methane fermentation process into a filtrate and a dehydrated product. Further, the dehydrating means 11 is added with a third coagulant adding means for adding a phosphorus removing agent such as ferric chloride and a coagulant aid for promoting cohesiveness such as a polymer coagulant. An auxiliary agent addition unit having a third aggregation auxiliary agent addition unit is provided. The dehydrated product is incinerated or composted.
[0033]
The dehydrating means 11 is connected to a filtrate returning means 12 for returning the dehydrated and separated filtrate to the flocculating / separating means 2. The filtrate returning means 12 includes an aeration means 13 as an aerobic means for aeration of the filtrate, an aggregating means 14 for adding an aggregating agent to the filtrate that has been aerobic in the aeration means 13, and an aggregating process. The sludge removing means 15 for solid-liquid separation of the filtrate coagulated by the means 14 is connected in series.
[0034]
Further, the aggregating means 14 enhances the aggregating property of the second aggregating agent adding means for adding a coagulant such as ferric chloride to the filtrate made aerobic by the aeration means 13 and the polymer aggregating agent. A second aggregating auxiliary agent adding means for adding an aggregating auxiliary agent; and a second pH controlling means for measuring pH and adding a pH adjusting agent such as hydrochloric acid or sodium hydroxide as appropriate to control the pH to be alkaline. It has a second flocculation tank. The sludge removing means 15 performs solid-liquid separation on the filtrate coagulated by the coagulation means 14 by various solid-liquid separation methods such as filtration separation using a screen or a membrane or sedimentation separation processing. Then, the sludge removing means 15 removes the separated sludge, and the separated filtrate is returned to the flocculating / separating means 2 and mixed with the undiluted solution from which the sewage is separated from the urine sewage and subjected to flocculation treatment in an acidic atmosphere. The
[0035]
Next, the operation of the above embodiment will be described.
[0036]
First, the urine wastewater is caused to flow into the residue separation means 1 to be separated into a solid residue and a liquid stock solution, and the stock solution is caused to flow into a first agglomeration tank constituting the agglomeration separation means 2.
[0037]
On the other hand, the organic waste is put into the crushing means 5, and waste containing biodegradable organic waste such as raw garbage and agricultural and fishery waste is finely broken, preferably about 5cm square, and waste. It breaks and crushes plastics, plastics, polystyrene foam, glass, metal fragments and other contaminants that are extremely difficult to biodegrade.
[0038]
Then, the crushed waste is put into the mixing means 6 and the residue separated by the residue separating means 1 is introduced through the residue transport path 7. Thereafter, the waste and residue are stirred and mixed while heating to about 55 ° C. using, for example, steam to prepare a mixture. By stirring and mixing the waste and the residue, the organic matter adhering to the residue is reduced in viscosity and solubilized in warm water generated by condensation of steam. Then, the mixture prepared by stirring and mixing for a predetermined time is allowed to flow into the residue removing means 8 to separate and remove the solid residue from which organic substances have been removed and the impurities in the waste. The removed residue and contaminants are separately formed into pellets, for example, into solid fuel, or disposed of by incineration.
[0039]
Thereafter, the mixture from which the residue and contaminants are separated and removed by the residue removing means 8 and the washing residual liquid generated during the washing and dehydration of the residues and impurities are caused to flow into the methane fermentation means 9. For example, the organic substance is methane-fermented with methane bacteria or the like with appropriate stirring at 55 ° C. The methane gas generated by the methane fermentation process is recovered by methane gas recovery means, used for power generation, etc., and used as operating energy for the treatment of manure sewage and organic waste.
[0040]
Next, the fermented product after the methane fermentation treatment is allowed to flow into the dehydrating means 11 such as a centrifuge. Then, the third coagulant adding means constituting the auxiliary agent adding means suitably adds, for example, a phosphorus removing agent such as ferric chloride, and the coagulating auxiliary agent adding means constituting the third coagulant auxiliary agent adding means. Add a coagulant aid such as a polymer flocculant.
[0041]
By adding a phosphorus removing agent such as ferric chloride from the third aggregating agent adding means, the mixing means 6 mixes the phosphate ions in the urine wastewater mixed with the residue with the residue. Aggregate. Due to the aggregation of phosphate ions, magnesium and ammonium in the sewage sewage mixed with the phosphate ions react with the phosphate ions to react with magnesium ammonium phosphate (Mg (NH _Four ) PO _Four ) And is removed together with the sludge to prevent generation as a scale in each pipe or tank. In addition, the sludge produced by the methane fermentation process is aggregated with the polymer flocculant, and the soluble organic matter related to COD that is difficult to biodegrade and remains in the methane fermentation process is aggregated.
[0042]
Then, after the flocculation treatment, for example, the filtrate and the dehydrated product are dehydrated and separated by a centrifuge. The dehydrated material is composted or incinerated, for example.
[0043]
Thereafter, the filtrate separated by the dehydrating means 11 is caused to flow into the aeration means 13 of the filtrate returning means 12 and aerated to be in an aerobic state.
[0044]
Further, the filtrate aerobic by the aeration means 13 is caused to flow into the second flocculation tank of the flocculation means 14 constituting the filtrate return means 12, and the second pH control means is made alkaline, for example, about pH 8-9. While controlling, a coagulant such as ferric chloride is added by the second coagulant adding means, and a coagulant assistant such as a polymer coagulant is added by the second coagulant auxiliary means. By adding these aggregating agents, organic substances and inorganic substances related to COD remaining without being treated can be agglomerated. In addition, when a heavy metal etc. contain in a filtrate, it is good to control to about pH8.5-10.
[0045]
Then, the filtrate after the coagulation treatment is caused to flow into the sludge removing means 15, and solid-liquid separation such as filtration separation using a screen or a membrane or sedimentation separation treatment is performed. When a screen is used, the eye width dimension should be set to 0.8 mm or more. The agglomerated solid-liquid separated is incinerated, for example, and the filtrate is allowed to flow into a first aggregating tank constituting the aggregating and separating means 2.
[0046]
Thereafter, in the first flocculating tank of the flocculating / separating means 2, the inflowing filtrate and the undiluted liquid flowing in from the residue distribution means 1 are mixed. Then, while controlling the pH to be acidic by the first pH control means, an inorganic flocculant such as ferric chloride is added by the first flocculant addition means, and phosphate ions and soluble organic substances in the stock solution are added. Etc. and the organic matter remaining without being treated in an alkaline atmosphere in the filtrate is agglomerated. Thereafter, the agglomerates are separated by a first solid-liquid separation means such as a screen, a sedimentation separator, or a membrane separation, for example, incinerated, and the separated water flows into the biological treatment means 3.
[0047]
Next, the separated water that has flowed into the biological treatment means 3 is subjected to purification treatment of organic substances, nitrogen compounds, and the like contained in the biological nitrification denitrification reaction.
[0048]
Then, the treatment liquid treated by the biological treatment means 3 is caused to flow into the second solid-liquid separation means 4 and subjected to solid-liquid separation treatment such as filtration separation and sedimentation separation treatment using a screen or a membrane, and the purification treatment liquid and sludge And solid-liquid separation to treat manure wastewater and waste. The separated sludge is partially returned to the biological treatment means 3, and the remaining portion is separately used as fertilizer.
[0049]
As described above, according to the above-described embodiment, the sewage sewage from which the residue has been separated by the residue separating means 1 is biologically treated by the biological treatment means, and the separated residue and crushed The mixture is prepared by heating and mixing the subsequent waste with the mixing means 6 and then removing the residue with the residue removing means 8, and the methane fermentation treatment with the methane fermentation means 9. Therefore, organic matter adhering to the residue is eluted with a reduced viscosity, and the methane fermentation process is performed together with the organic matter that is eluted from the organic waste in the waste. It is not discharged to the outside, so that the residue can be easily treated without deteriorating the surrounding environment, pollutants from manure wastewater and waste from waste can be treated efficiently and at the same time. By effective use, It can reduce the management cost.
[0050]
In addition, the fermented product obtained by the methane fermentation treatment by the methane fermentation means 9 is dehydrated and separated by the dehydration means 11, and the obtained filtrate is returned to the biological treatment means 3 by the filtrate return means 12, and biologically mixed with manure wastewater. Because nitrification and denitrification treatment is performed, filtrate containing untreated contaminants in methane fermentation can be highly purified by biological treatment using the energy obtained in methane fermentation treatment. The pollutant from the waste water and the pollutant from the waste can be treated efficiently at the same time, and the highly manure waste water and waste can be treated efficiently.
[0051]
Furthermore, the mixing means 6 mixes the residue with the waste, elutes the organic matter adhering to the residue, and removes only the residue and impurities that are difficult to biodegrade while washing with the residue removing means 8. After that, since it is put into the methane fermentation means and processed for methane fermentation, the residue and impurities are not discharged out of the system with organic substances and other contaminants attached, and it is easily and efficiently advanced without deteriorating the surrounding environment. It can treat manure wastewater and waste.
[0052]
And when processing waste, since it does not directly methane-fermentate but pulverizes after crushing means 5 in advance and methane-fermentation, even if impurities that are difficult to biodegrade are mixed in organic waste By crushing contaminants together with organic waste to obtain a substantially uniform composition, the subsequent methane fermentation treatment can proceed efficiently.
[0053]
In addition, when the fermented product obtained by the methane fermentation treatment by the methane fermentation means 9 is dehydrated and separated by the dehydration means 11, the polymer flocculant and the phosphorus removal agent are added by the auxiliary agent addition means. The subsequent fermented product can be efficiently and easily dehydrated, and soluble organic matter and phosphate ions that are not easily aggregated by the polymer-based flocculant can also be aggregated and separated, and highly manure wastewater and organic waste can be treated.
[0054]
The filtrate returning means 12 is constituted by connecting the aeration means 13, the agglomerating means 14 and the sludge removing means 15 in series, and the filtrate obtained by dehydrating the dehydrating means 11 is returned to the biological treatment means 3. When returned by the means 12, the filtrate is brought into an aerobic state by the aeration means 13, the flocculant is added by the agglomeration means 14 and subjected to agglomeration treatment, followed by solid-liquid separation by the sludge removal means 15 and the biological treatment means 3 In order to return it to the water, the dissolved organic matter solubilized in the reduced state of methane fermentation, which is difficult to remove by biological treatment, is converted into an oxidized state by aeration in advance, and the undegraded soluble organic matter and the remaining inorganic matter are aggregated and removed. The load on the later biological treatment means 3 can be reduced, and highly efficient purification can be achieved.
[0055]
Further, the filtrate dehydrated and separated after the methane fermentation treatment is not directly returned to the biological treatment means 3 by the filtrate return means 12, but is allowed to flow into the coagulation separation means 2 together with the stock solution from which the residue from the residue separation means 1 has been separated. Since the separated water and liquid separated are allowed to flow into the biological treatment means 3, soluble organic substances and inorganic substances that are difficult to purify by biological treatment are coagulated and separated in advance, and the raw solution and filtrate are combined for biological treatment. Highly efficient treatment of manure wastewater and organic waste.
[0056]
Further, since the filtrate subjected to the flocculation separation process in the alkaline atmosphere by the flocculation means 14 and the sludge removal means 15 constituting the filtrate returning means 12 is flocculated and separated in the acidic atmosphere by the flocculation separation means 2, the flocculation separation cannot be performed in the alkaline atmosphere. It is possible to agglomerate and separate pollutants such as soluble organic matter remaining in the wastewater, and to treat manure wastewater and organic waste with high efficiency.
[0057]
In addition, since the bag removal process is not performed before crushing the waste and during crushing, the organic substances of the organic waste remain attached to the impurities to be removed and are not discharged outside the system. Can be processed.
[0058]
In addition, in the said embodiment, although the filtrate which dehydrated after the methane fermentation process was returned and demonstrated to the biological treatment means 3, you may process the fermentation processed material after a methane fermentation process separately from a stock solution.
[0059]
Further, after mixing the residue and waste by the mixing means 6, the methane fermentation treatment may be performed directly without removing the residue and impurities by the residue removing means 8.
[0060]
Further, the waste is crushed by the crushing means 5 and then mixed with the residue by the mixing means 6. However, the waste and the residue may be directly mixed depending on the state of the waste.
[0061]
The residue separated from the residue separation means 1 and the waste are mixed and described in the methane fermentation treatment. However, while removing the waste from the urine wastewater, the waste is separately removed from the waste. After the methane fermentation, the filtrate may be biologically treated together with the urine wastewater from which the residue is removed by dehydration. According to this method, contaminants that cannot be treated by methane fermentation treatment can be removed by biological treatment, and manure sewage and waste can be treated with high efficiency.
[0062]
Further, the third aggregating agent adding means and the third aggregating auxiliary agent adding means are provided in the dehydrating means 11, but it may be simply dehydrated and separated. In particular, when the aggregating treatment is performed by the filtrate returning means 12, that is, When the aggregating means 14 is provided, the dehydrating means 11 may not perform the aggregating treatment. In the case where the filtrate returning means 12 is not provided with the aggregating means 14, it is preferable that the aggregating process be performed.
[0063]
The aeration means 13, the agglomeration means 14 and the sludge removal means 15 have been described in the filtrate return means 12. However, the filtrate may be returned directly to the agglomeration separation means 2 or the biological treatment means 3 after the dehydration process. .
[0064]
Further, in the flocculation process of the filtrate returning means 12, the flocculation is performed in an alkaline atmosphere, and the flocculation separation means is flocculated in an acidic atmosphere. However, the present invention is not limited to this, and the pH may be adjusted appropriately depending on the state of the filtrate or stock solution. .
[0065]
Further, the residue and the waste are mixed while being heated by the mixing means 6, but may be simply mixed without being heated.
[0066]
Further, in addition to composting dehydrated matter generated in the second solid-liquid separation means 4 after the biological treatment means 3, the dehydrated product may be put into the methane fermentation means 9.
[0067]
Next, the configuration of another embodiment of the waste treatment apparatus of the present invention will be described with reference to FIG.
[0068]
In the embodiment shown in FIG. 2, the residue and impurities removed by the residue removing means 8 of the embodiment shown in FIG.
[0069]
In other words, the cleaning means 21 for cleaning the residue and impurities removed by the residue removing means 8 is connected to the residue removing means 8. Further, the cleaning means 21 is connected to a residue cleaning liquid transfer means 22 for transferring at least a part of the cleaned residue cleaning liquid to the methane fermentation means 9. The residue washing liquid obtained by the washing means 21 is a mixture from the residue removal means 8 and a washing residual liquid generated at the time of dehydration by being conveyed to the methane fermentation means 9 via the residue washing liquid conveying means 22. The residue and impurities that have been subjected to methane fermentation treatment with the mixed solution and the like and cleaned are, for example, separately formed into pellets to be converted into solid fuel or incinerated.
[0070]
And the moisture content in the mixing means 6 in which the residue with low moisture content separated by the residue separating means 1 and the organic waste with low moisture content is mixed is relatively low, about 82%. The mixture mixed by the mixing means 6 does not increase the water content at the time when it is put into the methane fermentation means 9 even if the residue and impurities are removed by the residue removal means 8. There is a possibility that the load during stirring and mixing in the means 9 is increased, and methane fermentation does not easily proceed substantially uniformly as a whole. In the case of stirring and mixing, the water content is preferably set to about 87% or more.
[0071]
By the way, in the embodiment shown in FIG. 2, since the residue washing liquid after washing the residue and impurities by the washing means 21 flows into the methane fermentation means 9 through the residue washing liquid transport means 22, The water content in the fermentation means 9 is increased, the stirring and mixing during methane fermentation is smoothed, and the methane fermentation efficiency is improved.
[0072]
In the mixing means 6, fermentation, which is acid decomposition of pollutants, has progressed to some extent, and the residue and contaminants removed by the residue removal means 8 are produced by microorganisms or fermentation that promote fermentation. It is in a state where fermentation-promoting components that promote fermentation such as various decomposition products serving as nutrient sources for microorganisms are attached. For this reason, the residue washing liquid obtained by the washing means 21 is in a state in which these microorganisms and fermentation promoting components are contained. Therefore, when the residue washing liquid flows into the methane fermentation means 9, microorganisms and fermentation promoting components also flow, so that the efficiency of methane fermentation in the methane fermentation means 9 is improved and the processing time is shortened.
[0073]
In addition, since the adhering microorganisms and fermentation-promoting components are washed away from the residue and contaminants, for example, it is easy to form a separate pellet and form a solid fuel or incinerate, so that there is no off-flavor etc. The post-processing can be simplified and the configuration of the post-processing apparatus can be simplified.
[0074]
In the embodiment shown in FIG. 2 described above, the residue cleaning liquid from the cleaning unit 21 is conveyed to the methane fermentation unit 9, but may be conveyed to the mixing unit 6.
[0075]
That is, as described above, since the mixing means 6 is charged with the low water content residue separated by the residue separating means 1 and the organic waste with the low water content and mixes them, the mixing means 6 The water content of the mixture is relatively low, about 82%, and is difficult to stir smoothly. However, by adding a residue washing liquid, the moisture content increases and smooth agitation is obtained. The microorganisms and fermentation promoting components therein are supplemented, fermentation in the mixing means 6 can be further promoted, methane fermentation efficiency in the subsequent methane fermentation means 9 is improved, and processing time can be shortened.
[0076]
Further, water added to the mixing means can be saved.
[0077]
【The invention's effect】
According to the waste treatment apparatus of the first aspect, the sewage sewage from which the residue is separated is biologically treated by the biological treatment means, and the separated residue and the biodegradable organic waste are added. Because it is stirred and mixed with methane fermentation while warming, the viscosity of the organic matter adhering to the residue decreases and elutes, and it is processed with organic waste, so the residue is not discharged out of the system with the organic matter attached, The residue can be easily treated without deteriorating the surrounding environment, and the organic matter adhering to the residue is treated together with the organic waste, so that the treatment efficiency can be improved and the effective use of the methane gas generated by methane fermentation reduces the treatment cost. Can be reduced.
[0078]
According to the waste treatment apparatus of claim 2, in addition to the effect of the waste treatment apparatus of claim 1, the methane fermentation-treated fermentation treatment product is dehydrated and separated, and the filtrate is returned to the biological treatment means by the filtrate return means. In order to return it for biological treatment with urine wastewater, the contaminants in the untreated filtrate by methane fermentation are purified by biological treatment together with urine wastewater using the energy obtained by methane fermentation. It is possible to treat it, improve the treatment efficiency, and can treat manure sewage and organic waste highly without damaging the surrounding environment.
[0079]
According to the waste treatment apparatus according to claim 3, in addition to the effect of the waste treatment apparatus according to claim 1 or 2, the organic waste is crushed and then subjected to methane fermentation treatment. Even if impurities that are difficult to decompose are mixed, the impurities are removed together with organic residues by crushing the impurities together with the organic waste, so that the impurities can be removed together with the residue, and the subsequent methane fermentation process can proceed. It can be promoted and processed efficiently.
[0080]
According to the waste treatment apparatus according to claim 4, in addition to the effect of the waste treatment apparatus according to claim 2 or 3, a polymer flocculant and a phosphorus removal agent are added when dehydration separation is performed after methane fermentation treatment. Therefore, it is possible to efficiently and easily perform dehydration treatment, to coagulate and separate soluble organic matter and phosphorus that are difficult to biodegrade, and to treat highly manure wastewater and organic waste.
[0081]
According to the waste treatment apparatus of claim 5, in addition to the effect of the waste treatment apparatus according to any one of claims 2 to 4, the dehydrated and separated filtrate is brought into an aerobic state by the aerobic means, and the agglomeration means is used. The flocculant is added and the flocculant is treated, and then solid-liquid separation is performed by the sludge removal means, and then returned to the biological treatment means. Since the aerobic oxidation treatment is performed and the undegraded soluble organic substances and the remaining inorganic substances are agglomerated and removed, the burden on the biological treatment means after returning can be reduced, and highly efficient purification can be achieved.
[0082]
According to the waste treatment apparatus of the sixth aspect, in addition to the effect of the waste treatment apparatus according to any one of the second to fifth aspects, the dehydrated and separated filtrate is agglomerated and solidified with the urine waste water from which the residue is separated. In order to perform biological treatment after liquid separation, soluble organic substances and inorganic substances that are difficult to purify by biological treatment are coagulated and separated by combining the filtrate and urine wastewater, and biological treatment is performed. Highly efficient processing.
[0083]
According to the waste treatment apparatus according to claim 7, in addition to the effect of the waste treatment apparatus according to claim 6, the filtrate obtained by aggregating and separating in an alkaline atmosphere after the methane fermentation treatment is combined with an urine sewage by an agglomeration separation means in an acidic atmosphere. Because it is agglomerated, the undissolved soluble organic matter and remaining inorganic matter after methane fermentation treatment can be efficiently agglomerated and removed in an alkaline atmosphere, and the remaining soluble organic matter and remaining inorganic matter are agglomerated and removed in an acidic atmosphere. Highly efficient treatment of manure wastewater and organic waste.
[0084]
According to the waste treatment apparatus according to claim 8, in addition to the effect of the waste treatment apparatus according to any one of claims 1 to 7, the residue removed by the residue removal means is washed by the washing means. Therefore, for example, when the residue is separately formed into pellets to form solid fuel or incinerated, generation of off-flavors can be prevented, and post-treatment can be easily performed.
[0085]
According to the waste treatment apparatus of claim 9, in addition to the effect of the waste treatment apparatus of claim 8, the residue cleaning liquid obtained by cleaning the residue by the cleaning means is methane by the residue cleaning liquid transport means. Mixing means that can increase the moisture content in the methane fermentation means into which a mixture having a low moisture content from the mixing means flows into the fermentation means, and the methane fermentation treatment can proceed smoothly, while a certain degree of fermentation proceeds Fermentation-accelerating components such as nutrient sources for microorganisms contained in the mixture from the above are added by transporting the residue washing liquid, and the methane fermentation treatment efficiency can be improved.
[0086]
According to the waste treatment apparatus of claim 10, in addition to the effect of the waste treatment apparatus of claim 8, the residue cleaning liquid obtained by cleaning the residue by the cleaning means is mixed by the residue cleaning liquid transporting means. The moisture content in the mixing means in which the low moisture content residue separated by the residue separating means and the organic waste having the low moisture content are mixed is increased. And organic waste can be mixed smoothly, and fermentation-promoting components such as nutrients for microorganisms contained in the mixture from the mixing means where a certain degree of fermentation proceeds are returned by the transport of the residue washing liquid. Fermentation can proceed further, and the methane fermentation treatment efficiency in the methane fermentation means in the subsequent process can be improved.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an embodiment of a waste treatment apparatus of the present invention.
FIG. 2 is a block diagram showing the configuration of another embodiment of the waste treatment apparatus of the present invention.
[Explanation of symbols]
1 Sediment separation means
2 Aggregation and separation means
3 biological treatment means
5 Crushing means
6 Mixing means
8 Waste removal means
9 Methane fermentation means
11 Dehydration means
12 Filtrate return means
13 Aeration means as aerobic means
14 Aggregation means
15 Sludge removal means
21 Cleaning means
22 Residue cleaning liquid transfer means

Claims (10)

A residue separating means for separating the residue from the urine wastewater;
A biological treatment means for biologically treating the urine sewage from which the residue from the residue separation means has been removed;
Mixing means for preparing a mixture by stirring and mixing the residue and the biodegradable organic waste while heating;
Sediment removing means for removing the residue from the mixture;
A waste treatment apparatus comprising: a methane fermentation means for performing a methane fermentation treatment on the mixture from which the residue has been removed from the residue removal means. Dehydration means for dehydrating and separating the fermented product that has been subjected to methane fermentation treatment by methane fermentation means into filtrate and dehydrated product,
The waste treatment apparatus according to claim 1, further comprising a filtrate return means for returning the filtrate to the biological treatment means. The waste treatment apparatus according to claim 1 or 2, further comprising a crushing means for crushing the organic waste before the methane fermentation treatment with the methane fermentation means. 4. The waste treatment apparatus according to claim 2, further comprising an auxiliary agent adding means for adding a polymer flocculant and a phosphorus removing agent when dehydrating and separating by the dehydrating means. The filtrate return means
Aerobic means to bring the filtrate to an aerobic state;
An aggregating means for adding an aggregating agent to the filtrate brought into an aerobic state by the aerobic means and performing an agglomeration treatment;
The waste treatment apparatus according to any one of claims 2 to 4, further comprising a sludge removal means for solid-liquid separation of the filtrate subjected to the aggregation treatment by the aggregation means. Agglomeration separation means for aggregating the urine sewage from which the residue from the residue separation means has been aggregated, solid-liquid separated into agglomerated separation water and agglomerated sludge, and supplying the agglomerated separation water to the biological treatment means,
The waste treatment apparatus according to any one of claims 2 to 5, wherein the filtrate return means returns the filtrate to the biological treatment means via the coagulation / separation means. The aggregating means agglomerates in an alkaline atmosphere,
The waste treatment apparatus according to claim 6, wherein the aggregating and separating means performs aggregating treatment in an acidic atmosphere. The waste disposal apparatus according to any one of claims 1 to 7, further comprising a cleaning unit that cleans the residue removed by the residue removing unit. 9. The waste treatment apparatus according to claim 8, further comprising a residue cleaning liquid transport unit that transports the residue cleaning liquid obtained by the cleaning unit to the methane fermentation unit. 9. The waste treatment apparatus according to claim 8, further comprising a residue cleaning liquid transport unit that transports the residue cleaning liquid obtained by the cleaning unit to the mixing unit.

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