KR940006407B1 - Method and apparatus for treatment of sewage on the spot - Google Patents

Abstract

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Description

Method and apparatus for field purification of septic tank sludge

1 is a flow sheet illustrating the device of the present invention in a peninsula.

TECHNICAL FIELD The present invention relates to a method and a device for purifying treatment by a device provided on a vehicle at a sludge water collecting site without bringing sludge water in a septic tank to a treatment plant.

In the past, housing complexes, schools, factories, and other parts of the city, except for urban areas where sewage was developed and washed away, are treated with septic tanks. These septic tanks need to be cleaned at least once a year. If the cleaning is neglected and left unattended, the septic tank's function will deteriorate and the unpurified undiluted solution will be discharged to sewage. The underground cause of the function is that scum sludge and undifferentiated solids accumulate in the septic tank, and the stock solution in the septic tank is shortened in proportion to the amount thereof, and the result is aerobic bacteria. Digestion of the stock solution is not discharged sufficiently.

Sludge water, which requires disposal at the time of cleaning, has been aspirated by a vacuum difference until now, which has been transported to a manure treatment plant and mixed with manure once. However, sludge water, which is the target of this transportation treatment, is mostly water and is poor in efficiency because it carries about 1/50 of sludge water. In addition, in the case of the increased installation of the septic tank, mixing and treating a large amount of sludge water with general manure in the manure treatment plant has a problem of lowering the digestive capacity of aerobic bacteria and thus reducing the processing capacity or not being able to cope with the scale.

Therefore, various attempts have been made to treat sludge water at the site of a septic tank requiring cleaning. For example, a dewatering car circulates a septic tank and separates solids and sewage and recovers only solids.

As the septic tank is shifted from the full aeration system (to the total aeration of the septic tank) to the separation aeration (aeration at the place where a part of the septic tank is divided), the conventional dehydration system cannot cope with it. That is, in the full aerator system, dehydration is also good because sludge water after all microorganisms have been treated is treated. However, in the separation aeration method, most of them are not yet treated with microorganisms, and the dehydration of sludge is poor, and even when dehydration is carried out by a filter press, the filtration rate is reduced to an extreme, causing the filtrate to deteriorate and clogging of the filter cloth. . Therefore, firstly, the filtration speed per unit area is slowed down by the large filtration area, or second, the filtration pressure is increased. Third, the means of increasing the compression pressure are considered, but these are contrary to the light weight and miniaturization of the device. It cannot be employed as dewatering for the purpose of this purpose.

Dehydration aids are used in other fields that require dehydration for efficient dehydration, but the addition of the preparation is not only costly but also increases the amount of dehydration cakes, which is not preferable for the treatment of septic tank sludge. Can not do it.

Next, a method of disposing a cake obtained by dehydration of sludge water is used to ferment it to a fertilizer. However, it has been found that fermentation of a dehydrated cake can be facilitated by lowering the water content to 60-65%. In a mobile dewatering wheel requiring lightweight miniaturization, it has been difficult to achieve this by increasing the pressing pressure. In addition, attempts to lower the water content by using a cationic or anionic other polymer flocculant in combination, but the use of a large amount of the polymer flocculant resulted in impairing the air permeability of the dehydrated cake, which was undesirable in fermentation.

In addition, when the septic tank of the separated aeration method is filtered by a conventional apparatus and method, the frequency of filtration cloth washing is greatly increased compared to the case of the septic tank of the aeration method, and there is a difficulty in that the filtration cloth washing is required almost every time. To clean the filter cloth at the cleaning site of the septic tank is to be provided with the treatment of the washing water and its apparatus, which is contrary to the purpose of miniaturizing or reducing the weight of the dehydration wheel.

Therefore, in the present invention, even if the sludge water in the separation aeration type septic tank as described above to enable effective dehydration treatment, and the method and apparatus for fermentation fermentation of dehydrated cakes have been examined and completed.

In other words, by forming a strong and water-permeable floc, the dehydration lump of low water content with low filtration pressure and compression pressure, the dehydration capacity is improved and the weight of the device is reduced, and the amount of polymer coagulant used is extremely small. The present invention has been made in consideration of the purpose of using a dehydration aid that is not harmful to fermentation and can be reduced to soil as a fertilizer or useful for soil.

Its characteristic is that a sludge water is sucked and cleaned in a septic tank using a treatment device equipped with a vehicle to remove solids having a large particle therein, and porous micropowder and flocculant having a micropore or hollow structure are added to the sludge water. The porous micropowder is used as a nucleus, and the sludge powder is agglomerated, and the dewatered cake formed by filtration with a filter press is removed. The filtrate is neutralized by adding a neutralizing agent, if necessary, to be refluxed in the washing water of the septic tank. Or discharged into sewage by sterilization.

The apparatus includes a solids collecting device (3) having a large particle in sludge water, a porous micropowder adding device (A), an inorganic coagulant or a polymer flocculant adding device (B), (D) a neutralizer adding device (C), and a line mixer thereof. 13), the filter press 14, the cake conveyor 16, the cake crusher 17, the sterilization device 18 for the discharge, and the pressure feed pump 15 of the filtrate as a mechanism that is equipped in the vehicle, characterized in that It is to be done.

According to such a method and apparatus, solids in a septic tank sludge water are dehydrated in situ, and porous fine powder having a pore or hollow structure becomes a nucleus before being subjected to pressure filtration by a filter press to promote coagulation by a flocculant. Here, a solid and water-permeable floc is formed, and the filter is filtered by the filter press at a low filtration pressure and a compression pressure, thereby making it possible to fertilize the dehydrated cake.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is a flow sheet showing the device of the present invention in a semi-solar form.

Except for the septic tank 1, all the instruments (parts enclosed by a dashed line) are installed on the vehicle. Since the body does not require a special structure, the illustration is omitted. The sludge water of the septic tank 1 is transferred to the large-sized solids collecting device 3 by suction of the raw water injection pump 12 or by the raw water suction pump 2 to remove stones, garbage and the like.

Next, the most characteristic porous micropowder adding device (A), inorganic coagulant (aluminum sulfate) adding device (B), neutralizing agent adding device (C), and polymer coagulant adding device (D) are sequentially installed.

In these constitutions, the inorganic coagulant adding device (B) and the neutralizing agent adding device (C) may be omitted when the sludge water of the septic tank of the full aeration type and the combined treatment type is targeted. If the polymer coagulant is not used in combination, the filtration rate may be reduced by about 20%. The porous micropowder adding device (A) is composed of a dissolution tank (4) and a quantitative injection pump (5) having a stirrer inside, and have a pore or hollow structure, for example, pearlite, diatomaceous earth, activated carbon, acidic clay, silica or carbon. It has a function of mixing so that the hollow bodies and the like are easily dispersed in water. The other chemical | medical agent addition apparatus (B), (C), (D) also has the structure which consists of the same dissolution tank 6, 8, 10, and the fixed-quantity injection pump 7, 9, 11.

The sludge water to which an appropriate amount of porous micropowder, inorganic coagulant, and neutralizing agent is added is properly mixed and reacted through the raw water injection pump 12 to react to form a fine floc. Next, a flocculant is added and the porous micropowder is firmly used as a nucleus and has good water permeability while passing through the line mixer 13.

After the floc is formed, filtration and compression are performed by the filter press 14 provided next.

The dewatered cake obtained by the filter press 14 is carried out to the outside of the gas by the belt-shaped cake interface 16 provided below. At this time, it is crushed by the cake grinder 17 so as to be suitable for embedding or semi-fermentation.

The filtrate is usually returned to the septic tank by the filtrate discharge pump 15. When discharged to the outside is discharged to the sewer 19 after sterilization by the sterilization device (18).

The improvement of the dehydration capacity by the above-mentioned treatment apparatus and method is remarkable, and fermentation is possible without using a dehydration cake as an auxiliary fuel or without a moisture control agent.

Next, specific examples are described with numerical values. The sludge, which was circulated by vacuum car for domestic septic tank in Okayama City, Japan, was tested for about one year by the method and apparatus according to the present invention.

The test was carried out with mixed sludge collected at 50% of full aeration type and 50% of separate aeration type, but this is a conventional collection because a large amount of dehydrated cake is needed for a long time to investigate the fermentation status of the dehydrated cake at the same time. We had no choice but to run tests in the system, so we could not dehydrate the site. The mixed sludge waters were SS8000mg / l, BOD4000mg / l, and COD3500mg / l. This is passed through a large particle collecting device (cyclone type), and then 20% porous microparticles (perlite) are added to the solids (DS), and 120 ppm of aluminum sulfate and 20 ppm of cationic polymer flocculant are added to the flocculant. The mixture was stirred and mixed with a line mixer 13, the sludge was agglomerated, transferred to the filter press 14, and filtered under pressure.

The properties of this filtrate were, on average, SS25 mg / l or less, BOD60 mg / l, and a perspective of about 30 cm, as seen in the first table, which showed a significant improvement compared to the conventional method. In addition, the filtration pressure at this time was up to 3kg / ㎠ it turned out that the water permeability is good.

After the completion of the filtration, it was proved that the pressing pressure due to air pressure was 5 kg / cm 2, and the total yield of the cake was 68% -70%, which was pressed at low pressure.

The fermentation of the dehydrated cake was carried out last, but it was not fermented because it was not fermented unless the broiler powder (40% water content) was mixed in a large amount as a conventional moisture control agent due to the low water content and the low amount of polymer coagulant. The fermentation was completed in about 10 days.

In the conventional dewatering aberration, the combined septic tank and the aeration tank septic tank are the object of treatment, but the present invention allows the separation aeration type and the decay type septic tank sludge treatment for the first time. It is.

[Table 1]

According to the method and apparatus of the present invention, even in the case of a septic tank sludge of a separate aeration system, it is possible to perform dehydration treatment in a septic tank. Sludge is characterized in that flocs formed by easy flocculation by the porous micropowder and the flocculant are easily dehydrated, and the mesh of the filter cloth is hardly blocked. The cake obtained is suitable for fermentation and can be used as a fertilizer. In addition, the porous micropowder present in the fertilizer is useful as a soil metering agent because it improves the air permeability, water retention, and nutrient retention.

Thus, by the method and apparatus of the present invention, it is possible to economically and promptly treat the septic tank sludge water in the field where the septic tank is located.

Claims (2)

The sludge water is sucked and cleaned in a septic tank using a treatment device equipped with a vehicle, and solid particles having a large particle are removed from the sludge water, and porous fine powder having a pore or hollow structure and flocculant are added to the sludge water. The septic tank characterized in that the powder is used as a nucleus, and the sludge powder is agglomerated to remove the dewatered cake generated by filtration by a filter press, and neutralization is added to the neutral if necessary, and the mixture is refluxed into the washing water of a septic tank or sterilized and discharged into sewage. On-site treatment of sludge water. Large particle collecting device (3), porous micropowder adding device (A), inorganic coagulant or polymer coagulant adding device (B) (D), neutralizer adding device (C) and their line mixer (13), filter press (14) Method for on-site purification of septic tank sludge water, which is equipped on the vehicle with a series of mechanisms.

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