JP2012005924A - Organic wastewater treatment method and microorganism activator used in the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic wastewater treatment method which can reduce the wastewater treatment time required for purification of organic wastewater, such as sewage and night soil, by activating effective microorganisms and can miniaturize wastewater treatment equipment to reduce running cost, and a microorganism activator used in the method.SOLUTION: The organic wastewater containing organic substances is purified in a wastewater treatment tank 3 using a silicon sol, which is gelled by dilution, and the effective microorganisms, and treated water discharged from the wastewater treatment tank 3 is made to meander upward and downward and the treated water flowing upward is made to pass through a narrow passage portion 41.

Description

  The present invention relates to an organic wastewater treatment method for purifying sewage, human waste and other organic wastewater, and a microbial activator used in the method.

  Conventionally, organic wastewater treatment methods for purifying organic wastewater such as sewage, manure, etc. have a large number of purification treatment tanks, and after decomposing organic matter, ammonia, etc. by microorganisms in the microorganism treatment tank, solid-liquid separation In the tank, solids and treated water are separated, and the treated water is further subjected to advanced treatment such as agglomeration treatment in an aggregating treatment apparatus (for example, see Patent Document 1). In the coagulation treatment apparatus described in Patent Document 1, the treatment water separated in the solid-liquid separation tank is added with a polymerization coagulant containing a silica component and an iron component under acidic to neutral conditions of pH 5 to 7.5. Is agglomerated, and further purified by a solid-liquid separation tank and a filtration tank.

  The conventional organic wastewater treatment method has a large number of purification treatment tanks corresponding to each process such as a microorganism treatment process, a solid-liquid separation process, an agglomeration process, a filtration process, etc. As a result, the installation location of the wastewater treatment facility is limited, and the installation and maintenance of the wastewater treatment facility requires enormous costs.

  The applicant of the present application performs wastewater treatment of wastewater containing a large amount of organic matter such as wastewater from restaurants and food / beverage factories and livestock barnage even in areas where sewerage is not maintained, with simple equipment with few processing steps. The organic waste water treatment method which can be performed is provided (refer patent document 2). An organic wastewater treatment method described in Patent Document 2 includes an active oxygen supply device that supplies active oxygen to a wastewater treatment tank that purifies organic wastewater containing organic matter using useful microorganisms and a silicon flocculant, and a treatment A filtration device for filtering wastewater is provided, a SOD-producing microorganism that produces superoxide dismutase (SOD) is added to the wastewater treatment tank, and metal ions that cause the Fenton reaction are added to the wastewater treatment tank.

  In addition, in wastewater treatment equipment that purifies treated water with activated sludge containing Bacillus bacteria, etc., minerals that elute magnesium ions and silicate ions are housed to promote the growth of Bacillus bacteria, etc. A wastewater treatment method is known (see, for example, Patent Document 3).

JP 2004-33897 A International Publication No. 2010/049971 JP 2005-329301 A

  However, in the conventional organic wastewater treatment method, when the membrane separation method is used in the solid-liquid separation tank, clogging of the membrane occurs due to the solid content contained in the wastewater, and the membrane is frequently washed or replaced. There is a problem that it is necessary, complicated, and expensive. On the other hand, in the gravity sedimentation type solid-liquid separation tank, since the solid-liquid separation process takes time, there is a problem that the waste water treatment time becomes long and the apparatus itself becomes large.

  The organic wastewater treatment method described in Patent Document 2 has fewer treatment steps than the conventional water treatment method, enables the downsizing of the water treatment apparatus, and reliably purifies the organic wastewater. This is an epoch-making water treatment method. As described above, an organic wastewater treatment method is required to be a treatment apparatus that is inexpensive and can be installed in a narrow place, and further functional rationalization and miniaturization are required.

  In addition, since the wastewater treatment method described in Patent Document 3 contains minerals in the wastewater treatment apparatus, the amount of magnesium ions and silicate ions eluted in the water to be treated is extremely small, such as Bacillus bacteria. There was also a problem that it was insufficient to promote the growth of the potato.

  Therefore, the present invention can activate useful microorganisms to shorten the wastewater treatment time for purifying sewage, human waste and other organic wastewater, and reduce the wastewater treatment equipment to reduce running costs. It is possible to provide an organic wastewater treatment method and a microbial activator used in the method.

  In order to solve the above-mentioned problems, the present invention provides an organic wastewater treatment method for purifying an organic wastewater containing an organic substance in a wastewater treatment tank using a silicon sol that gels by dilution and useful microorganisms. In addition, the present invention provides an organic wastewater treatment method in which treated water discharged from the wastewater treatment tank meanders up and down so that the treated water flowing upward passes through the narrow path portion.

  Moreover, the organic waste water treatment method of the present invention is such that the treated water flowing downward passes through the narrow path portion.

  Further, in the organic wastewater treatment method of the present invention, the treated water flowing upward is folded downward at a position lower than the discharge port discharged from the wastewater treatment tank, and the folded position downward is repeated each time the folding is repeated. It is designed to be lower.

  Moreover, the organic waste water treatment method of the present invention includes a filtering means for filtering the treated water after meandering.

  In the organic wastewater treatment method of the present invention, the useful microorganism is a Bacillus bacterium.

  In the organic wastewater treatment method of the present invention, the hydrogen ion concentration in the wastewater treatment tank is maintained at pH 6.5 to 8.3, the activated sludge concentration (MLSS) is maintained at 3000 mg / L or more, and Silicon sol is used.

  Further, the present invention is a microbial activator that is used in the above-described organic wastewater treatment method and activates the useful microorganisms, wherein a silicon-containing solute obtained by mixing and heat-treating a silicon-containing substance and an alkaline substance is used as an acid solvent A microbial activator comprising a dissolved silicon sol is provided.

  The microbial activator of the present invention is characterized in that the silicon-containing solute is heat-treated at a temperature not higher than the thermal melting point of the silicon-containing substance.

  In the microbial activator of the present invention, the alkaline substance is calcium carbonate or lime.

  In the microbial activator of the present invention, the silicon-containing substance contains magnesium or a magnesium compound.

  In the microbial activator of the present invention, the silicon-containing solute is composed of one or more substances selected from the group consisting of cement, an intermediate product of cement, blast furnace slag, and coal ash.

  In the microbial activator of the present invention, the acid solvent is dilute hydrochloric acid.

  In the microbial activator of the present invention, the acid solvent contains one or more gelation inhibitors selected from the group consisting of acetic acid, ammonium acetate and ammonium chloride.

  The microbial activator of the present invention is used in an organic wastewater treatment method for purifying organic wastewater containing organic matter in a wastewater treatment tank using a silicon sol that gels upon dilution and useful microorganisms. A microbial activator for activating the useful microorganisms, comprising a silicon sol in which a silicon-containing solute obtained by mixing and heat-treating a silicon-containing substance and an alkaline substance is dissolved in an acid solvent.

  The organic wastewater treatment method of the present invention is an organic wastewater treatment method for purifying organic wastewater containing organic substances in a wastewater treatment tank using silicon sol that gels by dilution and useful microorganisms. The treated water discharged from the wastewater treatment tank meanders up and down so that the treated water that flows upward passes through the narrow portion, so that the treated water that flows upward passes through the narrow portion. The sludge contained in the treated water stays in front of the narrow passage and settles, and mainly only water passes through the narrow passage, so that the sludge can be separated every time the treated water passes through the narrow passage. The sludge that could not be purified in the wastewater treatment tank can be easily and quickly separated.

  Further, the organic wastewater treatment method of the present invention can separate sludge while the treated water discharged from the wastewater treatment tank meanders up and down, eliminating the need for a solid-liquid separation tank and reducing the size of the entire apparatus. In addition, the solid-liquid separation time can be shortened and the entire processing process can be shortened.

  Moreover, the organic waste water treatment method of the present invention has an effect of preventing the separated sludge from flowing backward by allowing the treated water flowing downward to pass through the narrow path portion.

  Further, in the organic wastewater treatment method of the present invention, the treated water flowing upward is folded downward at a position lower than the discharge port discharged from the wastewater treatment tank, and the folded position downward is repeated each time the folding is repeated. By making it low, treated water can be discharged from the wastewater treatment tank using water pressure, and drainage resistance due to meandering of the discharged treated water is reduced, and the treated water is discharged into the wastewater treatment tank. There is an effect that can be easily discharged from.

  In addition, the organic wastewater treatment method of the present invention includes a filtration means for filtering the treated water after meandering, so that the treated water from which sludge has been separated is treated with various ultrafiltration membranes (UF membranes). There is an effect that it is possible to obtain treated water that can be reused by filtration through an intermediate membrane.

  In the organic wastewater treatment method of the present invention, the useful microorganism is a bacterium belonging to the genus Bacillus, and the bacterium belonging to the genus Bacillus is activated by silicon and has excellent degradability such as protein, starch, fats and oils, There is an effect that organic substances can be efficiently decomposed.

  In the organic wastewater treatment method of the present invention, the hydrogen ion concentration in the wastewater treatment tank is maintained at pH 6.5 to 8.3, the activated sludge concentration (MLSS) is maintained at 3000 mg / L or more, and By using silicon sol, useful microorganisms are activated and organic matter is subdivided, so when silicon sol is gelled, organic matter can be taken in quickly to form floc, and water treatment This has the effect of shortening the time.

  The microbial activator of the present invention is a microbial activator that is used in the above-described organic wastewater treatment method and activates the useful microorganisms, wherein a silicon-containing solute obtained by mixing and heat-treating a silicon-containing substance and an alkaline substance is used. The silicon-containing solute that has been heat-treated can be dissolved in an acid solvent by having a structure comprising a silicon sol dissolved in an acid solvent, and silicon that promotes the growth of useful microorganisms such as Bacillus bacteria is dissolved in an acid Since it can be supplied in a state, it is possible to activate useful microorganisms used for purification treatment of organic wastewater, and when silicon sol is gelled, it becomes porous and acts as a carrier for supporting the useful microorganisms. Therefore, it is possible to further promote the growth of useful microorganisms and maintain the activated state of the useful microorganisms.

  In addition, by using the microbial activator of the present invention, when silicon sol is gelled, the organic matter in the organic waste water is taken in to form a floc. Since the taken-in organic substance is decomposed by the useful microorganisms supported and activated by the porous floc, there is an effect that the amount of discharged sludge can be greatly reduced.

  That is, in this organic wastewater treatment method using a microbial activator, the organic matter contained in the organic wastewater can be reliably decomposed by the activated useful microorganisms, and the suspension that is difficult to decompose is aggregated by the silicon sol. And can be separated at the narrow passage after being discharged from the waste water treatment tank. Moreover, since this silicon sol forms a smooth floc, the filtration membrane is not easily clogged, and the life of the filtration membrane can be greatly extended.

  In addition, the microbial activator of the present invention has an excellent acid solubility because the silicon-containing solute is heat-treated at a temperature below the thermal melting point of the silicon-containing substance. There is an effect that a stable silicon sol can be generated by dissolution.

  Moreover, since the silicon-containing solute becomes powdery because the alkaline substance is made of calcium carbonate or lime, the microbial activator of the present invention can improve the solubility in an acid solvent. Further, the microbial activator of the present invention contains calcium rich in silicon sol, thereby promoting the growth of useful microorganisms and maintaining the activated state of useful microorganisms.

  In addition, since the silicon-containing substance contains magnesium or a magnesium compound, the microbial activator of the present invention contains abundant inorganic salts that promote the growth of useful microorganisms. There exists an effect which can maintain the activated state.

  In addition, the microbial activator of the present invention was heat-treated by the silicon-containing solute being made of one or more substances selected from the group consisting of cement, cement intermediate, blast furnace slag, and coal ash. The silicon-containing solute can be dissolved in an acid solvent to produce a silicon sol. In particular, cement, cement intermediate products, and blast furnace slag are rich in calcium and magnesium, which are inorganic salts that promote the growth of useful microorganisms. Therefore, the generated silicon sol promotes the growth of useful microorganisms. Has the effect of maintaining the activated state.

In addition, the microbial activator of the present invention produces a safe and non-toxic microbial activator because the acid solvent is composed of dilute hydrochloric acid, so that hydrochloric acid has high calcium solubility and, when neutralized, becomes calcium chloride (CaCl ₂ ). There is an effect that can.

  In addition, the microbial activator of the present invention is such that the acid solvent contains one or more gelation inhibitors selected from the group consisting of acetic acid, ammonium acetate, and ammonium chloride, so that Since the gelation of the sol can be suppressed and a stable sol state can be maintained for a long time, there is an effect that the storage and transportation of the microbial activator is facilitated.

  The microbial activator of the present invention is used in an organic wastewater treatment method for purifying organic wastewater containing organic matter in a wastewater treatment tank using a silicon sol that gels upon dilution and useful microorganisms. A microbial activator for activating the useful microorganisms, wherein a silicon-containing solute obtained by mixing a silicon-containing substance and an alkaline substance and heat-treating is dissolved in an acid solvent, whereby the heat-treated silicon-containing solute is an acid. Silicon that can be dissolved in a solvent and promotes the growth of useful microorganisms such as Bacillus bacteria can be supplied in an ionic state by dissolving it in an acid. When the silicon sol is gelled, it becomes porous and acts as a carrier for supporting useful microorganisms. Microorganisms have an advantage of being able to remain activated.

The block diagram which shows one Example of the organic waste water treatment method of this invention. The plane block diagram which shows the other Example of the organic waste water treatment method of this invention. The plane block diagram which shows the other Example of the organic waste water treatment method of this invention.

Embodiments of the present invention will be described based on examples shown in the drawings.
The organic wastewater treatment method according to the present invention uses a silicon sol that gels by dilution and useful microorganisms to purify organic wastewater containing organic matter in the wastewater treatment tank 3, and the wastewater treatment tank 3. The treated water discharged from the water is caused to meander up and down so that the treated water flowing upward passes through the narrow passage portion 41.

  In the embodiment shown in FIG. 1, a wastewater treatment apparatus 10 used in an organic wastewater treatment method includes a wastewater treatment tank 3 that purifies organic wastewater using useful microorganisms and a flocculant, and the wastewater treatment tank 3. It is comprised from the drainage channel 4 which discharges treated water, and the filtration apparatus which is equipped with the flat membrane tank 5 and filters treated water.

  The wastewater treatment tank 3 is configured to receive raw organic wastewater discharged from restaurants and the like. In the wastewater treatment tank 3, useful microorganisms suitable for the decomposition treatment of the organic matter contained in the organic wastewater are added to keep the useful microorganisms activated. The waste water treatment apparatus 10 may be provided with a flow rate adjustment tank so that the amount of organic waste water flowing into the waste water treatment tank 3 is uniform when the amount of organic waste water flowing into the waste water treatment tank 3 is large. Is possible.

  The waste water treatment tank 3 is provided with an aeration device 31, which sends aeration to organic waste water to which useful aerobic microorganisms are added, aerates and activates the useful microorganisms, thereby decomposing organic substances contained in the waste water. The organic wastewater is purified.

  In the Examples, useful microorganisms are Bacillus bacteria as dominant species, and photosynthetic bacteria are added. Bacillus bacteria are activated by silicon and are excellent in decomposing organic substances such as proteins, starches, fats and oils, and ammonia, and can be used alone. The photosynthetic bacterium is preferably a red non-sulfur bacterium that can act under aerobic conditions. It prefers to decompose organic substances such as fats and oils and starch, and can also decompose hydrogen sulfide and ammonia that cause odors to eliminate bad odors. . Moreover, since the waste water treatment tank 3 is aerated by the aeration apparatus 31, various organic substances can be decomposed by adding other aerobic microorganisms.

  In the examples, a microbial activator in which a silicon-containing solute obtained by mixing and heat-treating a silicon-containing substance and an alkaline substance is dissolved in an acid solvent is used as the silicon sol.

The silicon-containing material is a natural earth or rock containing a silicon compound such as silicon dioxide (SiO ₂ ), or a processed product containing them. In addition, the silicon-containing substance preferably contains iron that has a reducing action and is excellent in agglomeration of ultrafine particles, and that contains magnesium to promote the growth of useful microorganisms such as Bacillus bacteria. preferable. As the silicon-containing material, for example, as shown in Table 1, Ibube white clay (earth in Okinawa Ibube region) containing a high content of silicon dioxide and containing iron oxide (FeO ₃ ) can be used. .

The alkaline substance is mixed in order to change the silicon-containing substance into acid solubility. In the embodiment, calcium carbonate (CaCO ₃ ) or lime is mixed as the alkaline substance with the silicon-containing substance and heat-treated. Thereby, the generated silicon-containing solute becomes powdery, so that solubility in an acid solvent is improved and calcium, which is an inorganic salt that promotes the growth of useful microorganisms, can be included. This heat treatment is preferably performed at a temperature not higher than the thermal melting point of the silicon-containing material, because if it is performed at a temperature higher than the thermal melting point of the silicon-containing material, it becomes glassy and its solubility is lowered. When the silicon-containing material is Ibube Shirato (earth in Ibube, Okinawa Prefecture) shown in Table 1, it is performed at an arbitrary temperature of about 1300 ° C. or lower, which is the thermal melting point of Ibube Shirato, and the thermal melting point. It is preferable to perform heat treatment at 1150 to 1250 ° C., which is close to.

  Since the silicon-containing solute has excellent acid solubility by heat treatment at a temperature below the thermal melting point of the silicon-containing substance, it can be dissolved in an acid solvent to form a stable silicon sol, which can be stored for a long time. In addition, inorganic salts that promote the growth of useful microorganisms can be dissolved in an acid and supplied in an ionic state.

  Further, as the silicon-containing solute, a product obtained by mixing and heat-treating a silicon-containing substance and an alkaline substance such as cement, an intermediate product of cement, blast furnace slag, and coal ash can be used. Although these silicon-containing solutes are inferior in acid solubility compared to silicon-containing solutes that have been heat-treated at a temperature lower than the thermal melting point of the silicon-containing substance, they must be dissolved in an acid solvent containing a gelation inhibitor described later. Thus, a stable silicon sol can be generated. Moreover, since these silicon-containing solutes contain a lot of inorganic salts, they can activate useful microorganisms. In particular, ordinary cement is relatively excellent in acid solubility, and as shown in Table 1, since it contains abundant magnesium and calcium, which are inorganic salts that promote the growth of useful microorganisms, ordinary cement should be used as a silicon-containing solute. Is preferred. The silicon-containing solute may be used by mixing two or more substances selected from the group consisting of cement, cement intermediates, blast furnace slag, and coal ash.

In the examples, hydrochloric acid (HCl) was used as the acid solvent. Hydrochloric acid (HCl) is highly soluble in calcium and, when neutralized, becomes calcium chloride (CaCl ₂ ) and is safe and non-toxic. Therefore, hydrochloric acid is preferably used as the acid solvent. Further, since the solubility of silicon with respect to the acid concentration is constant and the density of the silicon sol dispersed in the liquid volume can only be kept stable in a constant water gap, diluted hydrochloric acid diluted with hydrochloric acid as an acid solvent. In particular, it is preferable to use dilute hydrochloric acid diluted 3 to 7 times. The acid solvent is not limited to hydrochloric acid (HCl), and other acid solutions can also be used.

The acid solvent contains one or more gelation inhibitors selected from the group consisting of acetic acid (C ₂ H ₄ O ₂ ), ammonium acetate (CH ₃ COONH ₄ ), and ammonium chloride (NH ₄ Cl). Preferably there is. The acid solvent contains acetic acid (C ₂ H ₄ O ₂ ) as a gelation inhibitor, so that the drop amount of acetic acid is adjusted by adjusting the acetic acid pH buffering action and the convergence of the sol and colloid. Gelation can be suppressed. In addition, since organic acids such as acetic acid are excellent substrates for red bacteria, it is possible to further activate useful microorganisms such as red bacteria by using acetic acid as a gelation inhibitor.

  Since this microbial activator contains a large amount of inorganic salts such as silicon, magnesium and calcium in an ionic state, it can promote the growth of useful microorganisms in the wastewater treatment tank 3 and maintain the activated state. . Further, when the microbial activator is put into the wastewater treatment tank 3, the acid solvent is diluted with the organic wastewater to be gelled. When the silicon sol is gelled, it encloses and aggregates organic substances in the organic waste water to form flocs. Since this floc becomes porous, it also acts as a carrier for supporting useful microorganisms, and organic substances taken into the floc can be decomposed by the useful microorganisms.

  The wastewater treatment tank 3 maintains the hydrogen ion concentration in the tank at pH 6.5 to 8.3, maintains the activated sludge concentration (MLSS) at 3000 mg / L or more, and activates useful microorganisms. It is preferable to put the activator into the tank. When the useful microorganisms are activated, the organic matter contained in the organic waste water is fragmented. Therefore, when the silicon flocculant gels, the organic matter can be quickly taken in to form a floc, and the microorganism activator Thus, the activated state can be continued.

  As shown in FIG. 1, the wastewater treatment apparatus 10 includes a drainage channel 4 arranged meandering up and down, and is configured so that treated water after purification treatment can be discharged from the upper part of the wastewater treatment tank 3. It is. In the drainage channel 4, a narrow channel portion 41 having a cross-sectional area narrower than other portions is formed below the upward channel portion 4a and the downward channel portion 4b. In the embodiment, the narrow passage portion 41 is formed by a synthetic resin pipe having a diameter of 50 mm, and the drainage passage 4 of the other portion is formed by a synthetic resin pipe having a diameter of 100 mm. The cross-sectional area of the narrow path part with respect to the area is 25%).

  When the treated water flowing through the upward flow path portion 4a passes through the narrow channel portion 41, it strikes the changing portion 42 where the diameter of the drainage channel 4 changes, generating a vortex and separating the sludge contained in the treated water. The separated sludge stays in front of the narrow passage portion 41 and gradually settles, and mainly only water passes through the narrow passage portion 41. Therefore, every time treated water passes through the narrow passage portion 41, the sludge is separated. be able to. The narrow passage portion 41 can be formed only in the upward flow passage portion 4a, but by forming it in the downward flow passage portion 4b, the separated sludge can be prevented from rising and flowing backward.

  The cross-sectional area of the narrow channel portion 41 is 10% of the cross-sectional area of the drainage channel 4 excluding the narrow channel portion 41 because the sludge can be reliably separated while ensuring the flow rate of treated water passing through the narrow channel portion 41. % To 70% (diameter ratio of about 30% to 80%), preferably 25% to 55% (diameter ratio of about 50% to 75%) of the cross-sectional area of the drainage channel 4 excluding the narrow channel portion 41 It is more preferable that it is formed in (1). The narrow path portion 41 and the change portion 42 are formed as a single unit and are connected to the drainage channel 4 constituting the other part. The size of the narrow path portion 41 can be appropriately selected according to the characteristics of the organic waste water to be treated.

  The change part 42 is formed in the inclination angle which can isolate | separate the sludge contained in a treated water reliably, and it is preferable to form in the inclination angle 45 degrees-90 degrees.

  The upper folded portion 4c of the drainage channel 4 is disposed at a position lower than the water intake 43 for taking the treated water from the drainage treatment tank 3 to the drainage channel 4, and the treated water can be easily discharged from the wastewater treatment tank 3 using water pressure. It is configured so that it can be discharged. Further, the drainage channel 4 is arranged meandering a plurality of times, and the plurality of upper folded portions 4 c are arranged so as to become lower in order from the intake port 43 side to the discharge port 44 side. Since the drainage channel 4 is configured as described above, the drainage resistance due to the meandering of the drainage channel 4 can be reduced, and the treated water can be easily discharged from the wastewater treatment tank 3.

  In the illustrated embodiment, the drainage channel 4 is arranged to meander twice in the vertical direction. The drainage channel 4 may be provided with one or more upward flow path portions 4a in which the narrow channel portion 41 is formed, and the number of meanders of the drainage channel 4 is appropriately set according to the characteristics of the organic drainage to be treated. It is possible.

  The narrow channel portion 41 can be formed at any position of the upward flow channel portion 4a and the downward flow channel portion 4b, but the separated sludge is quickly settled in the lower folded portion 4d of the drainage channel 4. Therefore, it is preferable that they are formed below the upward flow path portion 4a and the downward flow path portion 4b.

  As shown in FIG. 1, the lower folded portion 4 d of the drainage channel 4 is provided with a sludge discharge mechanism 6 that discharges residual sludge. The sludge discharge mechanism 6 includes a sludge transport path 61 having a screw 62 therein, a motor 63 that drives the screw 62, and a sludge discharge pipe 64 that discharges residual sludge transported in the sludge transport path 61. It is.

  Each lower folded portion 4d of the drainage channel 4 is provided with a sludge discharge pipe 45 so that residual sludge settled on the lower folded portion 4d can be discharged to the sludge discharge mechanism 6. The sludge discharge mechanism 6 drives the screw 62 with the motor 63, conveys the sludge received from the sludge discharge pipe 45 into the sludge conveyance path 61, and discharges it from the sludge discharge pipe 64. The sludge discharge pipes 45 and 64 are provided with valves 46 and 65, respectively, and when the screw 62 is driven, the valves 46 and 65 are opened to discharge sludge.

  The residual sludge discharged from the sludge discharge mechanism 6 can be returned to the waste water treatment tank 3 or the flow rate adjustment tank and purified by useful microorganisms.

  Since the wastewater treatment apparatus 10 can easily and quickly separate residual sludge that could not be purified in the wastewater treatment tank 3 by the drainage path 4 in which the narrow passage portion 41 is formed, a solid-liquid separation tank is unnecessary. Thus, the entire apparatus can be reduced in size, and the solid-liquid separation time can be shortened to shorten the entire time of the water treatment process. The waste water treatment device 10 can be installed even in a place where it is difficult to secure the installation location of the device because the drainage channel 4 is arranged around the waste water treatment tank 3 so that the installation location of the waste water treatment tank 3 is sufficient. .

  In the illustrated embodiment, the wastewater treatment device 10 includes a filtration device that filters the treated water discharged from the drainage channel 4. The filtration device is composed of a flat membrane tank 5, and can treat treated water through a submerged membrane using various ultrafiltration membranes (UF membranes) to obtain reusable treated water. Since the flat membrane tank 5 receives the treated water from which the sludge is separated by the drainage channel 4, the treated water can be drawn out at a low pressure.

  The flat membrane tank 5 includes an aeration apparatus 51 and a backwashing mechanism for cleaning the flat membrane. The backwash mechanism has a discharge tank 52 that stores filtered water filtered through a flat membrane, a water supply pipe 53 that supplies filtered water to the discharge tank 52, and a filtered water stored in the discharge tank 52 that is supplied to the flat membrane for cleaning. It is composed of a backwash water pipe 54.

  Since the wastewater treatment method of the embodiment uses a silicon sol that gels by dilution, a free-flowing floc is formed, so that clogging of the flat membrane tank 5 is unlikely to occur, and cleaning is reliably performed by a backwashing mechanism. It was possible to extend the life of the flat membrane significantly (more than half a year). In addition, the wastewater treatment method of the example is presumed that the use of silicon sol makes it easier for silicon to dissolve in the treated water, and the surface of the flat membrane is always cleaned by the surface active action and aeration of silicon. Is done.

  In addition, the waste water treatment apparatus 10 can also be configured without a filtration device.

  In the embodiment shown in FIGS. 2 and 3, the waste water treatment apparatus 10 used in the organic waste water treatment method includes a raw water tank 1 into which raw water of the organic waste water flows, a precipitation tank 2 that removes solids from the raw water, A wastewater treatment tank 3 that purifies organic wastewater using a microorganism activator composed of useful microorganisms and silicon sol, a drainage channel 4 that discharges treated water from the wastewater treatment tank 3, and a flat membrane tank 5. And a filtering device for filtering the water.

  The raw water tank 1 is provided with an aeration device 11 so that raw water of organic wastewater discharged from a restaurant or the like flows in. In the raw water tank 1, useful microorganisms suitable for decomposing organic substances contained in organic wastewater are added to keep the useful microorganisms activated. The raw water tank 1 is configured to feed the stored raw water to the waste water treatment tank 3 in accordance with the purification treatment capacity of the waste water treatment tank 3 so that the flow rate of the raw water and fluctuations in water quality can be made uniform. The raw water tank 1 maintains the hydrogen ion concentration in the tank at pH 6.5 to 8.3, maintains the activated sludge concentration (MLSS) at 3000 mg / L or more, and activates useful microorganisms. The raw water can be sent to the waste water treatment tank 3.

  As shown in FIG. 3, the sedimentation tank 2 is provided with a filtration membrane 21 formed of sponge. The raw water is fed to the lower side of the filtration membrane 21 by the water feeding pipe 12, and the raw water filtered by the filtration membrane 21 is supplied to the sedimentation tank 2. It can be stored in the upper part of the settling tank 2. The lower part of the settling tank 2 is formed in a conical shape, and the precipitated solid content is discharged from a discharge pipe 13 provided at the center lower end of the tank. The solid content discharged from the discharge pipe 12 can be returned to the raw water tank 1 and the decomposition process using useful microorganisms can be repeated. The raw water stored in the upper part of the settling tank 2 is sent to the waste water treatment tank 3 through the water pipe 22.

  The waste water treatment tank 3 is provided with an aeration device 31 and added with useful microorganisms and microbial activators suitable for the decomposition treatment of organic substances contained in the organic waste water. Useful microorganisms and microbial activators are the same as in Example 1.

  In the embodiment, the raw water tank 1 and the waste water treatment tank 3 are formed so as to be able to accommodate raw water having a volume of about four times the daily treatable water volume so that the useful microorganisms in the tank can be activated. ing. In the wastewater treatment method of the embodiment, the organic matter contained in the organic wastewater in the wastewater treatment tank 3 is subdivided by activated useful microorganisms, so that the organic matter is quickly taken in when the silicon sol is gelled. A floc could be formed, and the time required for aggregation could be shortened to about 1/4 of the conventional time.

  The wastewater treatment apparatus 10 used in the organic wastewater treatment method of the embodiment is the same as that of the first embodiment in other configurations such as the drainage channel 4 and the flat membrane tank 5. In this wastewater treatment method, sludge can be separated while the treated water flows through the drainage channel 4, so that the time required for solid-liquid separation is reduced to about 1/10 compared to the conventional technique using a solid-liquid separation tank. I was able to shorten it. This wastewater treatment method eliminates the need for a solid-liquid separation tank and can significantly reduce the time required for water treatment such as agglomeration compared to the prior art. Can be formed compactly.

  This wastewater treatment method promotes the growth of useful microorganisms in the wastewater treatment tank 3 and activates them by using a microbial activator containing a large amount of inorganic salts such as silicon, magnesium and calcium in an ionic state. Can continue. Therefore, this wastewater treatment method can reliably decompose the organic matter contained in the organic wastewater with activated useful microorganisms, and can also rapidly agglomerate the suspension that remains without being decomposed. Therefore, not only can the purification process time be shortened and the equipment can be downsized, but also the amount of residual sludge discharged can be greatly reduced.

DESCRIPTION OF SYMBOLS 1 Raw water tank 2 Sedimentation tank 3 Wastewater treatment tank 4 Drainage channel 4a Upward flow path part 4b Downward flow path part 4c Upper folding part 4d Lower folding part 5 Flat membrane tank 6 Sludge discharge mechanism 10 Wastewater treatment apparatus 11 Aeration apparatus 12 Water supply pipe DESCRIPTION OF SYMBOLS 13 Exhaust pipe 21 Filtration membrane 22 Water supply pipe 31 Aeration apparatus 41 Narrow part 42 Change part 43 Intake port 44 Outlet 45 Sludge discharge pipe 46 Valve 51 Aeration apparatus 52 Drain tank 53 Water supply pipe 54 Backwash water pipe 61 Sludge conveyance path 62 Screw 63 Motor 64 Sludge discharge pipe 65 Valve

Claims (14)

An organic wastewater treatment method that purifies organic wastewater containing organic matter in a wastewater treatment tank using silicon sol that gels by dilution and useful microorganisms,
An organic wastewater treatment method in which the treated water discharged from the wastewater treatment tank meanders up and down so that the treated water flowing upward passes through the narrow path portion.   The organic wastewater treatment method according to claim 1, wherein the treated water flowing downward passes through the narrow path portion.   The treated water flowing upward is folded downward at a position lower than a discharge port discharged from the wastewater treatment tank, and the folded position downward is decreased in order each time the folding is repeated. Organic wastewater treatment method.   The organic wastewater treatment method according to any one of claims 1 to 3, further comprising filtration means for filtering the treated water after meandering.   The organic wastewater treatment method according to any one of claims 1 to 4, wherein the useful microorganism is a Bacillus bacterium.   The hydrogen sol concentration in the waste water treatment tank is maintained at pH 6.5 to 8.3, the activated sludge concentration (MLSS) is maintained at 3000 mg / L or more, and the silicon sol is used. The organic waste water treatment method as described in any one of these. A microbial activator that is used in the organic wastewater treatment method according to any one of claims 1 to 6 and that activates the useful microorganisms,
A microbial activator comprising a silicon sol in which a silicon-containing solute obtained by mixing and heat-treating a silicon-containing substance and an alkaline substance is dissolved in an acid solvent.   The microbial activator according to claim 7, wherein the silicon-containing solute is heat-treated at a temperature not higher than a thermal melting point of the silicon-containing substance.   The microbial activator according to claim 7 or 8, wherein the alkaline substance comprises calcium carbonate or lime.   The microbial activator according to any one of claims 7 to 9, wherein the silicon-containing substance contains magnesium or a magnesium compound.   The microbial activator according to claim 7, wherein the silicon-containing solute is composed of one or more substances selected from the group consisting of cement, cement intermediates, blast furnace slag, and coal ash.   The microbial activator according to any one of claims 7 to 11, wherein the acid solvent comprises dilute hydrochloric acid.   The microbial activator according to any one of claims 7 to 12, wherein the acid solvent contains one or more gelation inhibitors selected from the group consisting of acetic acid, ammonium acetate, and ammonium chloride. Microbial activity that activates the useful microorganisms used in organic wastewater treatment methods that purify organic wastewater containing organic matter in a wastewater treatment tank using silicon sol that gels by dilution and useful microorganisms An agent,
A microbial activator comprising a silicon sol in which a silicon-containing solute obtained by mixing and heat-treating a silicon-containing substance and an alkaline substance is dissolved in an acid solvent.

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