JP3981731B2 - Sludge treatment apparatus and sludge treatment method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sludge treatment method and a sludge treatment apparatus, and more particularly to an apparatus for treating liquid sludge and a method for treating the sludge.
[0002]
[Prior art]
At the water purification plant, after removing the dust and sand contained in the raw water taken from the river and dam, chlorine injection and filtration are performed. In many water treatment plants in Japan, this waste and sand removal process is carried out as follows. First, after removing large debris from raw water, an agglomerate such as polyaluminum chloride is introduced to sink fine sand floating in the water. By this agglomerate, fine sand floating in water is agglomerated, and a floc that is easy to sink is formed. And when this floc settles, the filtration process etc. are performed to the supernatant water, and it will be sent out to a water supply station as drinking water. On the other hand, the precipitated floc is dried for several months in the sun. After this drying, the remaining sludge is disposed of as industrial waste containing agglomerated material. In the disposal process, the sun-dried sludge is landfilled as it is, or in some cases, after further incineration treatment is performed to reduce the volume, the incinerated material is landfilled.
[0003]
By the way, photosynthetic bacteria such as cyanobacteria and red bacteria (red fungi) called effective microorganisms “EM” (Effect Microorganisms) are mainly used for soil and lake sludge where pollutants are voluminous due to pesticides and acid rain. In addition, an attempt has been made to regenerate the soil and sludge into resources that can be effectively used, such as horticultural soil, by treating with a mixture containing lactic acid bacteria, yeast, and the like (see, for example, Patent Document 1).
[0004]
Specifically, a mixture of yeast and lactic acid bacteria added to photosynthetic bacteria that synthesize organic matter that revitalizes animals and plants using polluted sediments such as sludge organic matter and sulfur, nitrogen, carbon oxides, and cyanide (hereinafter referred to as this) Is referred to as effective microorganism “EM”) to soil contaminated with pollutants. Furthermore, by sending light sources such as sunlight, incandescent lamps and fluorescent lamps, that is, "electromagnetic waves" into the soil, the activity of photosynthetic bacteria is activated and the processing is accelerated.
[0005]
An apparatus for accelerating this process includes a condensing unit using sunlight and a light transmission unit in which an optical fiber is connected to a light source such as an incandescent lamp. The condensing part comprises an inverted conical condensing part with an elliptical reflecting mirror as an upper surface and a support bar continuous from the conical part, and the inside of the support bar is a cylindrical shape having a reflection surface on the inside. Yes, the sunlight condensed by the light condensing part can be emitted from the tip of the support bar through the inside of the support bar. The light transmission part has a light source such as an incandescent lamp attached to the support bar instead of the light condensing part. An optical fiber is passed through the support bar, and the optical fiber is connected to the light source of the support bar. Out from the opposite end. The light collecting unit and the support rod part of the light transmission unit having such a structure are pierced in the vertical direction into soil or sludge, and light is irradiated to the inside of the soil or the like.
[0006]
Through such a series of treatments, spoilage substances and pollutants in the contaminated soil or lake sludge are decomposed. Furthermore, because many microorganisms inhabit the soil that has been subjected to the degradation treatment of such pollutants, the treated soil or sludge is further processed to contain a lot of nutrients that are effective for growing crops. Can be used as fertilizer.
[0007]
[Patent Document 1]
Japanese Patent No. 2949211 specification
[Problems to be solved by the invention]
However, due to the following problems, treatment of pollutants using effective microorganisms has not been performed on liquid sludge generated from, for example, water purification plants. That is, the sludge in the water purification plant that has been agglomerated by the aggregating material to precipitate the floc is a liquid that contains about 90% of water. Therefore, the viscosity of sludge is very low compared with the sludge settled in a lake etc., and it is impossible to pierce the conventional acceleration device into the sludge and make it independent. That is, the conventional accelerator cannot be installed as it is.
[0009]
On the other hand, the conventional sludge treatment at the water purification plant is incinerated and landfilled as industrial waste as described above, so the annual treatment cost is considerably high. In addition, since the supply of drinking water is indispensable for daily life, there are a considerable number of water purification plants throughout the country. Therefore, even if it is reduced by incineration, the amount of sludge that is disposed of in landfills is considerable on a nationwide scale and accumulates year by year, which may make it difficult to secure landfills in the future. Furthermore, not only fuel energy is consumed during incineration, but CO2 is generated, which is not preferable in terms of environmental degradation.
[0010]
Thus, conventionally, the sludge generated in the water purification treatment is a negative resource, and not only cannot be effectively used, but also it takes time and effort to dispose of it.
[0011]
The present invention has been made in view of such conventional problems, and a sludge treatment apparatus and sludge treatment for regenerating sludge having a high water content into resources that can be effectively used without generating by-products that lead to environmental degradation. It aims to provide a method. It is a further object to provide a sludge treatment apparatus and a sludge treatment method capable of treating sludge at a low treatment cost and additionally reducing the time required for treatment as compared with the conventional method.
[0012]
[Means for Solving the Problems]
Sludge treatment apparatus of the present invention, the light emitting portion in the vertical direction lower side of the bottom surface of the sludge storage tank for containing the sludge liquid containing rot material floatable floating plate and the sludge sludge storage tank this floating plate an accelerator but that having a light source attached to so that to position, comprising an effective microorganism consisting of bacteria group containing photosynthetic bacteria, red light source is suspended on the bottom surface of the floating plate, blue, green A sludge treatment apparatus including a LED combined with the LED, the liquid microorganism in the sludge storage tank is provided with the effective microorganisms and the accelerator, from the light source of the accelerator to the liquid sludge, By simultaneously irradiating the three colors of light, the activity of effective microorganisms in the liquid sludge is activated, and the septic substances in the liquid sludge are decomposed.
[0013]
The sludge treatment process of the present invention, light emission and sludge storage tank for containing the sludge liquid containing rot material, in the vertical direction lower side of the bottom of the floatable floating plate and the floating plate sludge sludge storage tank an accelerator that having a light source attached to so that to position the part, a sludge treatment method using the sludge treatment apparatus comprising an effective microorganism consisting of bacteria group containing the photosynthetic bacterium, the liquid An effective microorganism applying step for applying the effective microorganisms to the sludge, and reducing the water content of the liquid sludge to which the effective microorganisms have been applied by sunlight in a sludge storage tank, and simultaneously irradiating light from the light source of the accelerator Te is activated the activity of effective microorganisms in the sludge of the liquid, a first sludge treatment step to degrade rotting material in the sludge of the liquid in the first sludge treatment process, the water content was muddy reduction Using sludge as a base material, the base material Sludge cycled step of introducing sludge liquid containing new rot material above the water content of the sludge of the liquid which is introduced by the sludge re-adding step Lowering by sunlight in the sludge storage tank at the same time, the is activated the activity of effective microorganisms in the sludge of the liquid is irradiated with light from the accelerator source, and wherein the obtaining ingredients and a second sludge treatment step to degrade rotting material in the sludge of the liquid.
[0015]
According to the above configuration, light can be efficiently irradiated even to liquid sludge by the accelerator having a floating plate, and the applied effective microorganisms are actively activated to accelerate the decomposition of the septic substances. be able to.
[0016]
In addition, septic substances are decomposed by irradiation of light from the accelerator, and further, the amount of moisture is reduced by sun drying, and the sludge with a high proportion of effective microorganisms per unit volume is used as a base material, By adding a new liquid sludge on top of it and carrying out the second sludge treatment step, the newly introduced liquid sludge can be recovered in a shorter period of time due to the activity of effective microorganisms present in the base material. Septic substances can be processed.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0018]
At the water purification plant, after removing large dirt and sand mixed in the raw water by screening, in order to sink fine earth and sand floating in the water, a flocculant such as polyaluminum chloride is injected, and the flocculant and Stir well with water. Furthermore, in the floc formation pond, fine earth and sand are aggregated by the action of the flocculant, and flocs that are easy to sink are formed. The water in which the flocs are formed is sent to a sedimentation basin, left in this sedimentation basin, and separated into sludge and supernatant water settled at the bottom. The supernatant water is injected with chlorine, filtered in a filter basin, sterilized, and then sent to each water station.
[0019]
On the other hand, as shown below in this embodiment, sludge settled in a sedimentation basin is provided with effective microorganisms (EM), and sludge treatment is carried out by the activity of these microorganisms. Convert to
[0020]
(Embodiment 1)
FIG. 1 is a schematic perspective view showing a sludge treatment facility according to this embodiment.
[0021]
FIG. 2 is a schematic cross-sectional view of the sludge treatment facility of FIG. 1 cut along line II.
[0022]
1 is a sludge storage tank having a predetermined width and depth. Reference numeral 2 denotes a sludge inlet, which communicates with the sand basin. Liquid flock (sludge) precipitated in the settling tank is sucked up by a pump or the like and collected in the sludge storage tank 1 through the sludge inlet 2. The size and depth of the sludge storage tank 1 may be arbitrarily determined from the relationship between the sludge volume and the degree of drying of the sludge. Moreover, when there are a plurality of sedimentation basins, the sedimentation basin after draining the supernatant water may be used as it is.
[0023]
A sand layer 3 is provided to prevent the introduced sludge from penetrating into the underground.
[0024]
Reference numeral 5 denotes an accelerator, which is usually used floating on sludge. The accelerator 5 is composed of the following members.
[0025]
Reference numeral 50 denotes a float (floating plate) which is formed of a material and a size having a buoyancy enough to always float on sludge in a state where other members are mounted. Any material may be used as long as it can float, such as wood or polystyrene foam.
[0026]
Reference numeral 51 denotes a condenser, which includes a mirror-like inverted conical condensing part and a support bar extending therefrom, and the inside of the support bar is a cylinder having a reflection surface on the inside. The sunlight condensed by the condensing unit is emitted from the tip 51a of the support rod through the inside of the support rod. The tip 51a of the condenser 51 is usually immersed in sludge, and the sunlight emitted from the tip 51a can directly act on the sludge. In the present embodiment, the light condensing portion has an inverted conical shape. However, the present invention is not limited to this, and any shape such as a convex lens shape may be used as long as it can condense sunlight at one point. The condenser 51 is detachably attached to the float 50 with the condensing part facing up. In the present embodiment, it is attached in the vertical direction, but it may be attached by changing the incident angle according to the angle of sunlight or the state of sludge. Moreover, as long as the condensing part can change the direction of the inverted conical surface according to the angle of the sun, the sunlight can always be taken in to the maximum extent.
[0027]
52 is a lamp, those protected with a container of the L E D waterproof is transparent or translucent. The lamp 52 is suspended from the bottom surface of the float 50 and is always immersed in the sludge. The distance between the float 50 and the lamp 52 may be fixed, but it is preferable that the float 50 and the lamp 52 are suspended by a chain or the like and can be moved up and down as necessary. The lamp 52 is used to supply light to effective microorganisms in the sludge even at night when sunlight cannot be expected.
[0028]
Examples of “electromagnetic waves” that activate the activity of effective microorganisms (EM) include white light and infrared light from the lamp 52 described above, in addition to the sunlight. Red color as an emitter of the lamp 52, a blue, a combination of LED green three colors, configured to irradiate these three colors simultaneously is employed. By simultaneously emitting light of the three primary colors having a certain wavelength distribution and good luminous efficiency, it is possible to achieve effective photons for effective microorganisms.
[0029]
53 is a solar cell panel, and 54 is a battery that stores electricity from the solar cell panel 53. These power sources are provided for supplying electricity to the lamp 52. By using such an independent power source, the accelerator can be operated without requiring a power source on the ground. Moreover, by using the solar cell panel 53, the charged electricity can be used at night, which is very economical and preferable. Note that the power source is not limited to the solar battery, and other power sources may be used. For example, electricity may be supplied from a wind power generator provided on land. In that case, if the configuration up to the battery 54 is installed on the land and supplied to the accelerator side by the cord wiring, it is possible to install more concentrators 51 on the float 50 surface. Moreover, the on-shore power generation is not limited to wind power generation, but may be turbine power generation that burns primary biomass generated by the sludge treatment facility. Thus, by using the product as an energy source for the next generation, the product can be used without waste.
[0030]
Next, the effective microorganisms (EM) thrown into the sludge will be described.
[0031]
Effective microorganisms (EM) are obtained by adding fermentative bacteria such as lactic acid bacteria and yeasts to photosynthetic bacteria such as cyanobacteria and red bacteria. The cells attached to the sludge may be those obtained by further adding aerobic bacteria whose nutrition and respiration are complementary to these anaerobic bacteria, and both aerobic bacteria and anaerobic bacteria coexist in the sludge. As a result, the activity of effective microorganisms can be further increased. The ratio of each fungus is arbitrarily set according to the sludge concentration and the like.
[0032]
The procedure of sludge treatment in such a sludge treatment facility will be specifically described below.
[0033]
FIG. 3 is a schematic diagram showing the flow of sludge treatment.
[0034]
First, as a pretreatment for decomposing septic substances by effective microorganisms, a small amount of liquid sludge (floc) is put into the sludge storage tank 1 and allowed to dry in the sun for several days. (See FIG. 3A). This sludge layer 6 is intended to prevent effective microorganisms to be introduced later from flowing to the sand with water. The sludge layer 6 allows the effective microorganisms to remain in the liquid sludge and efficiently rot. Decomposes the material. Note that this pretreatment is not essential for the sludge treatment method of the present invention, and effective microorganisms are sludge together with water, such as making the sand of sandy soil finer, or providing a finer clay layer on the sandy soil. Any material can be used as long as it can be prevented from flowing out of the processing tank 1.
[0035]
As shown in FIG. 2A, sludge (floc) of a sedimentation basin is introduced into a sludge storage tank 1 in which a sludge layer 6 has been formed by pretreatment, and further, effective microorganisms are added thereto and an accelerator is floated. . The moisture content of the sludge at this time is 90% or more, and is almost in a sewage state. The sludge is irradiated with sunlight from the condenser during the day and from the lamp at night. By this irradiated light, effective microorganisms put into the sludge are actively activated, and the spoilage substances and the like are decomposed.
[0036]
In this way, by irradiating light from sunlight and a lamp from the top of the liquid surface toward the bottom of the sludge storage tank with the float floating, the effective microorganisms in the liquid are efficiently irradiated with light, and the activity of the effective microorganisms It will help to activate.
[0037]
In addition, when exposed to the sun during the day, the water evaporates and the water content in the sludge gradually decreases. When several days (about 30 days) have passed in this state, the water of the sewage is considerably evaporated and becomes muddy. Since the float cannot float in the mud state, the float is once taken out from the sludge storage tank, and only the condenser is pierced into the mud sludge (see FIG. 3B). As the moisture evaporates, the concentration of septic substances in the sludge increases, so that an environment in which effective microorganisms are more active is created. When left in this state for several days, the internal effective microorganisms grow.
[0038]
Next, the condenser is extracted from the sludge 7 in which the moisture has evaporated considerably and the content ratio of effective microorganisms is increased, and a base material 8 in which rice straw, compost, chicken manure, etc. are mixed with the effective microorganisms is distributed. That is, the sand 3 is deposited from the bottom of the sludge storage tank, the sludge 6 by the pretreatment, the sludge 7 that has become dry and mud, and the base material 8 are deposited in this order. Thus, by providing the sludge layers 6 and 7 between the base material 8 and the sand 3, it is possible to prevent the effective microorganisms in the base material from flowing out together with the water. Here, new sludge (sewage state) is introduced from the sedimentation basin, and the accelerator is floated (see FIG. 3C).
[0039]
Further, new effective microorganisms are introduced, and light is irradiated by a condenser and a lamp. The number of effective microorganisms at this time is larger than the amount of the effective microorganisms and the base material introduced and propagated earlier than the sewage of the first input sewage (at the time shown in FIG. 3A). Therefore, these effective microorganisms become more active by obtaining new food, and the sludge decomposition rate tends to accelerate.
[0040]
Leave in this state for several days to evaporate the moisture, and when it becomes mud, remove the float from the sludge storage tank, pierce only the condenser and continue the process. And after distributing a base material, a new sludge (sewage state) is thrown in from a sedimentation basin.
[0041]
In this way, sludge treatment by repeating sludge (sewage state) input, irradiation with lamps and concentrator combined, moisture drying, irradiation from the concentrator alone, base material input, and new sludge (sewage state) input I do. As the number of repetitions increases, the number of effective microorganisms contained in the sludge increases. Therefore, the input of effective microorganisms may be adjusted according to the progress of the sludge treatment.
[0042]
In addition, the type of cells of the effective microorganisms that are input first and the effective microorganisms that are input together with the base material may be different, depending on the content of pollutants in sludge or sewage and the habitat of the cells. It is preferable to change appropriately.
[0043]
When all the sludge (sewage state) is charged and dried in the sun, primary biomass is formed as shown in FIG.
[0044]
In FIG. 3, after the pretreatment, liquid sludge and effective microorganisms are added, and the base material is input after the sludge is evaporated to form a sludge layer. However, the present invention is not limited to this. Instead, the order in which the base materials are charged immediately after the pretreatment may be used.
[0045]
FIG. 4 is a schematic diagram showing a time schedule in which the base material is put in immediately after the pretreatment.
[0046]
First, sludge is introduced and dried in the sun to form a sludge layer on the sand, and then the base material is introduced and simultaneously effective microorganisms and liquid sludge to be treated are introduced. And an accelerator is floated there to promote the decomposition of spoilage material. If left in this state for one month, the water in the sludge evaporates to form mud sludge. This mud-like sludge is pierced with a condenser to further decompose the septic substances. At the same time, it is sun-dried to form primary biomass.
[0047]
When implemented in such a processing order, it takes about four months from the pretreatment to the generation of primary biomass as an example. However, this is only an example, and changes depending on the size of the sludge storage tank, the amount of sludge to be treated, the number of accelerators, and the temperature of the environment in which the sludge treatment is performed.
[0048]
Although only one accelerator is shown in the drawing, the present invention is not limited to this, and a plurality of accelerators may be arranged according to the area of the sludge storage tank.
[0049]
In this way, by using an accelerator having a float, even if the object to be processed has a very high water content, that is, a liquid or the like, active microorganisms can be actively activated, and in a relatively short period of time. Can be regenerated to primary biomass. Furthermore, by drying the input sewage and introducing new sewage into a place that has been changed to mud, effective microorganisms can be efficiently activated even for subjects with high water content, Sludge treatment can be accelerated.
[0050]
Therefore, the sludge that has been treated as industrial waste until now can be made into primary biomass, and not only can waste be reduced, but also can be regenerated as a valuable resource.
[0051]
(Embodiment 2)
In the first embodiment, the accelerator is left in a state of floating in the sludge storage tank. However, depending on the size of the sludge storage tank, there may be a portion where the light irradiated from the accelerator does not spread sufficiently. If this happens, the effective microorganisms may not act evenly throughout the sludge, but may also cause uneven distribution. Therefore, in this embodiment, by pulling the accelerator from the land, the entire liquid surface is scanned all over so that light is sufficiently irradiated everywhere.
[0052]
The accelerator is scanned by attaching a rope to the accelerator and pulling the rope from the land. The rope is pulled manually or automatically. In the automatic case, the rope is pulled by a winch or the like. Scanning on the liquid level may be performed every few days.
[0053]
(Embodiment 3)
In the first embodiment, the accelerator is configured to only irradiate sunlight and light from a lamp, but the effective microorganisms are heated together with the light so that the environment temperature inhabiting becomes a temperature suitable for the activities of the effective microorganisms. And the activity becomes more active and the processing is accelerated. Therefore, in the present embodiment, further provided with a hot water Rajie data, by heating the sludge (sewage), always maintaining the temperature environment for effective microorganisms.
[0054]
FIG. 5 is a cross-sectional view showing the sludge treatment facility in the present embodiment.
[0055]
The configuration of the accelerator 5 is substantially the same as that of the first embodiment, but a hot water radiator 55 is further provided. It is assumed that drive power for the hot water radiator 55 is supplied from the battery 54.
[0056]
By the operation of this hot water radiator, the sludge (sewage) is heated and the temperature environment in which the activity of effective microorganisms is most active is always maintained. Therefore, the decomposition of the spoilage substance is accelerated as compared with the case where there is no hot water radiator.
[0057]
It should be noted that the operation of the hot water radiator is appropriately adjusted according to the state of the sludge.
[0058]
Although the treatment of liquid sludge generated from a water purification plant has been described through the first to third embodiments, the present invention is not limited to this, and is effective for the treatment of sludge having a relatively high water content. For example, it can be applied to sewage treatment.
[0059]
【The invention's effect】
As described above, according to the present invention, it is possible to efficiently irradiate light sludge with an accelerator having a floating plate, and to actively activate the applied effective microorganisms to decompose spoilage substances. Can be accelerated.
[0060]
In addition, septic substances are decomposed by light irradiation from the accelerator, and further, the amount of moisture is reduced by sun drying, and the base material is sludge with a high ratio of effective microorganisms per unit volume, By adding a new liquid sludge on top of it and carrying out the second sludge treatment step, the newly introduced liquid sludge can be recovered in a shorter period of time due to the activity of effective microorganisms present in the base material. Septic substances can be processed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a sludge treatment facility in Embodiment 1. FIG.
2 is a cross-sectional view taken along the line II of FIG.
FIG. 3 is a schematic diagram showing a flow of sludge treatment in Embodiment 1, wherein (a) shows a first sludge treatment step, (b) shows a sludge re-input step, and (c) shows a second sludge treatment step. The process is shown, (d) shows the primary biomass which the process completed.
FIG. 4 is a schematic diagram showing a processing time schedule;
FIG. 5 is a cross-sectional view showing a sludge treatment facility equipped with a hot water radiator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sludge storage tank 2 Sludge inlet 3 Sand 4 Sludge 5 Accelerator 50 Float 51 Concentrator 51a Tip 52 Lamp 53 Solar battery panel 54 Battery 55 Hot water radiator 6 Sludge layer (deposition by pretreatment)
7 Sludge layer 8 Base material

Claims (10)

A sludge storage tank for storing liquid sludge containing septic substances;
An accelerator that having a light source attached to so that to position the light emitting portion in the vertical direction lower side of the bottom surface of the sludge storage tank sludge floatable floating plate and the floating plate,
An effective microorganism consisting of a group of bacteria containing photosynthetic bacteria, and a sludge treatment apparatus comprising a lamp in which the light source is suspended on the bottom surface of the floating plate and combined with red, blue and green LEDs ,
The liquid microorganisms in the sludge storage tank are provided with the effective microorganisms and the accelerator, and the liquid sludge is simultaneously irradiated with the light of the three colors from the light source of the accelerator. A sludge treatment apparatus characterized by activating activity of effective microorganisms in sludge and decomposing septic substances in the liquid sludge.   The sludge treatment apparatus according to claim 1, wherein the light source includes a light collecting member that collects sunlight and irradiates the sludge with sunlight collected from the light emitting portion. The sludge treatment apparatus according to claim 1 or 2, wherein the accelerator further includes an independent power source for supplying power to the light source, and the independent power source is installed on the floating plate. It further comprises a hot water radiator for heating the liquid sludge in the sludge storage tank, and the sludge temperature is always maintained at a temperature at which the activity of the effective microorganisms is most activated by heating from the hot water radiator. The sludge treatment apparatus according to any one of claims 1 to 3 . The effective microorganism, sludge treatment apparatus according to any one of claims 1 to 4, characterized by further comprising a yeast fungus and lactic acid. A sludge storage tank for containing the sludge liquid containing rot material, vertically lower side in the light emitting portion of the bottom surface of the floatable floating plate and the sludge sludge storage tank this floating plate is attached to so that to position an accelerator that having a light source was directed to a sludge treatment method using the sludge treatment apparatus comprising an effective microorganism consisting of bacteria group containing the photosynthetic bacterium,
An effective microorganism applying step for applying the effective microorganism to the liquid sludge;
The amount of water in the liquid sludge to which the effective microorganisms are applied is reduced by sunlight in a sludge storage tank, and at the same time, the light from the accelerator is irradiated to activate the activity of the effective microorganisms in the liquid sludge. A first sludge treatment step for decomposing septic substances in the liquid sludge,
In the first sludge treatment step, a sludge re-injection step in which a sludge having a reduced water content is used as a base material, and a liquid sludge containing a new septic substance is put on the base material;
At the same time as reducing the water content of the liquid sludge input by the sludge re-injection step with sunlight in the sludge storage tank, the light from the accelerator is irradiated to activate the active microorganisms in the liquid sludge. is activated, sludge treatment method characterized by obtaining ingredients and a second sludge treatment step to degrade rotting material in the sludge of the liquid. 7. The sludge treatment method according to claim 6, wherein the sludge re-input step and the second sludge treatment step are repeated a predetermined number of times. The sludge storage tank has a sand at the bottom,
Before the effective microorganism application step, liquid sludge is charged into the sludge storage tank and dried in the sun, and a pretreatment step is provided to form a sludge layer on the sandy land of the sludge storage tank. The sludge treatment method according to claim 6 or 7 . In the sludge re-injection step, the sludge in which the amount of water is reduced is added with effective microorganisms as a base material, and a liquid sludge containing a new spoilage substance is input onto the base material. The sludge treatment method according to any one of claims 6 to 8 , wherein: The light source sunlight is condensed, includes a light collector which sunlight condensed from said light emitting portion for irradiating against sludge, and a lamp suspended on the bottom surface of the floating plate,
In the first sludge treatment step and the second sludge treatment step, the sunlight from the light collecting member is irradiated to the sludge during the day, and the light from the lamp is irradiated to the sludge at night,
In the sludge re-input step, the condensing member removed from the accelerator was stabbed into mud-like sludge having a reduced water content, and further septic material decomposition treatment was performed by sunlight irradiated by the condensing member. The sludge treatment method according to any one of claims 6 to 9, wherein a material obtained by adding effective microorganisms to the later sludge is used as a base material.

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