JP2010269208A - Sludge treatment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sludge treatment method, in which sludge are efficiently decomposed at a low cost by means of microorganisms to reduce the quantity of production of the sludge. <P>SOLUTION: The sludge treatment method includes steps of: preliminarily picking sludge 10 as an object of decomposition and quantity-reduction; preparing or retrieving and specifying an effective micro-organism 12 having preferable suitability with respect to decomposition or quantity-reduction operation for the sludge 10; afterwards, applying the prepared or predetermined effective micro-organism 12 to the sludge 10 stored in a reaction tank 15; and decomposing and quantity-reducing the sludge 10 in the reaction tank 15. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sludge treatment method.

Conventionally, wastewater treatment at various factories and sewage treatment plants is usually performed by an activated sludge method.
And the sludge which generate | occur | produced in this process was dried and incinerated as industrial waste (excess sludge) like patent document 1, and was processed.

JP 59-4812

For example, in Osaka Prefecture, sludge treated as industrial waste may occupy 68% of the total amount of industrial waste. Most of the sludge is organic sludge that is produced in a huge amount every day by the activated sludge method from sewage treatment plants and various factories.
These sludges are industrial waste with the lowest reuse rate. The sludge treatment has a problem that enormous costs and time are required for sludge dehydration, drying, incineration, transportation, transaction, equipment maintenance, and the like. Moreover, since enormous heat energy was required, there was a problem that carbon dioxide etc. were generated in large quantities. In addition, there is a problem that the remaining disposal years of the final disposal sites such as landfills and incineration facilities are small, and the processing (disposal) costs are increasing. There was also a problem of bad odor from sludge.

For this reason, sludge (excess sludge) is difficult to treat, and physical and chemical sludge treatment methods such as ultrasonic treatment and ozone treatment have been used to reduce the amount of treatment. In order to do so, there is a problem that enormous processing costs such as equipment and operation costs are required.
In addition, there is a problem that enormous heat energy and enormous processing costs are required even when recycling to building materials and agricultural fertilizers.
That is, there has been a demand for a processing method that not only simply reduces sludge but also efficiently reduces sludge at low cost.

  Therefore, an object of the present invention is to provide a sludge treatment method for reducing sludge by efficiently and efficiently decomposing sludge with microorganisms.

  The sludge treatment method of the present invention is a method for decomposing and reducing sludge by effective microorganisms.

  In addition, after collecting sludge to be decomposed / reduced in advance and creating or searching for and identifying effective microorganisms suitable for decomposition / reducing effects on the sludge, the created or identified effective microorganisms are added to the reaction tank. It is a method of applying to the sludge accommodated and decomposing / reducing the sludge in the reaction tank.

  In addition, the above effective microorganisms are Pseudomonas, Proteabacterium, Flavobacterium, Corynebacterium, Actinobacterium, Cytophaga, Nocardia, Alkaline Genes, Chromobacterium, Nitrosomonas, Nitrobacter, Zoglea, Bacillus, Acinetobacter, Oceanoacillus, Sermonadasi, Delphia , One or a combination of two or more of Thermomonas.

  According to the sludge treatment method of the present invention, sludge generated by wastewater treatment can be efficiently decomposed by effective microorganisms and reduced by about 50% to 90%. Final disposal costs such as transportation costs of generated sludge can be reduced. In other words, it is possible to obtain a processing capacity up to about 10 times that of the conventional activated sludge method. Further, since the amount of sludge to be incinerated (excess sludge) is reduced, enormous heat energy is not required, and an energy saving effect and an emission reduction effect such as carbon dioxide can be obtained. In addition, odorous substances that cause malodor can be decomposed and reduced.

It is a simplified block diagram which shows an example of a reaction tank.

Hereinafter, the present invention will be described in detail based on the illustrated embodiment.
In the sludge treatment method of the present invention, as shown in FIG. 1, sludge 10 to be treated, such as raw sludge and dewatered cake generated from the activated sludge method using raw polluted water from domestic wastewater or factory wastewater, is treated in a reaction tank 15. To house. For example, the dehydrated cake is charged by a belt conveyor or a bucket. Sludge 10 to be treated includes various sludges such as raw sludge and dehydrated cake that have been conventionally incinerated, landfilled or recycled as industrial waste, or excess sludge and return sludge generated by the activated sludge method. That is.

The sludge 10 such as raw sludge and dewatered cake stored in the reaction tank 15 is dissolved, and the effective microorganisms 12 that are optimal for treatment such as decomposition, weight reduction, purification, etc. are added (injected).
The effective microorganism 12 to be imparted is developed in advance. That is, a suitable effective microorganism 12 having the best treatment action / effect is developed for the sludge 10 that is the target of treatment such as decomposition, reduction, purification, etc. collected in advance.

  The effective microorganism 12 is developed by taking into consideration aerobic and anaerobic, Pseudomonas, proteabacteria, flavobacteria, corynebacteria, actinobacteria, and cytophaga which are separately cultured and cultivated efficiently in a culture tank. , Nocardia, Alkaline Genes, Chromobacteria, Nitrosomonas, Nitrobacter, Zoglea, Bacillus, Acinetobacter, Oceanovacillus, Sermonadasi, Delphia, Thermomonas, or a combination of two or more. .

The type of sludge 10 to be treated is analyzed, and effective microorganisms 12 are developed regardless of the naturally grown microorganisms contained in the sludge 10. Moreover, the effective microorganism 12 is developed irrespective of the microorganism accustomed to the sludge to be treated or the raw polluted water. In other words, the microorganisms that are most suitable for the treatment action / effect of the sludge 10 to be treated are identified and searched from intentionally (artificially) created or intentionally cultured and grown, and effective microorganisms (custom-made microorganisms) are identified. ) Develop 12. A combination (group) of effective microorganisms 12 composed of a plurality of microorganisms is created or specified so as to correspond to sludge 10 in which various components are combined as in a sludge treatment plant.

  Then, the developed effective microorganisms 12 are put into a reaction tank 15 in which the sludge 10 is accommodated. The sludge 10 and odorous substances in the sludge 10 are decomposed, reduced, and purified in the reaction tank 15 by the effective microorganisms 12. In addition, odorous substances in the sludge 10 are decomposed and reduced. This reaction tank 15 is also called a bio farm.

As shown in the two-dot chain line in FIG. 2, the reaction tank 15 is a water spray jet filtration system (also referred to as a biojet system), and includes an adsorbent carrier, a filter bed, a reaction tank aeration tank, and a circulating water spray device. And. Effective microorganisms 12 and sludge 10 are refluxed by a circulating watering device.
In the reaction tank 15, an environment is created that promotes the decomposition of active microorganisms 12 (conditions such as pH adjustment (preferably around pH 7), oxygen supply by air, administration of activator, temperature adjustment, etc.) Set) if necessary. In addition, it is desirable to stably supply the effective microorganism 12.
It is also desirable to provide a pump capable of automatically supplying the effective microorganisms 12 to the reaction tank 15 and an effective microorganism storage tank.

  The sludge 10 is processed in the reaction tank 15 and becomes a small amount. A small amount of sludge 10 is transported from the reaction tank 15 to the next disposal site such as the next coagulation sedimentation tank, reprocessing in a membrane separation tank, or an industrial waste disposal company or landfill processing company. The

In the sludge treatment method of the present invention described above, effective microorganisms 12 having an excellent decomposing action are added to the sludge 10 as compared to the sludge 10 generated by the activated sludge method (microorganisms used in the conventional activated sludge method). By applying it, the sludge 10 is greatly reduced. That is, the amount of excess sludge that has been finally discarded or recycled is reduced.
For example, when effective microorganisms 12 are administered to sludge 10 composed of raw sludge generated by a conventional activated sludge method, a reduction (volume) of 90% daily treatment is possible. The sludge 10 composed of dehydrated cake can be reduced by 80% if it is dissolved in water and treated with the effective microorganism 12.

  As described above, according to the present invention, since the sludge 10 is decomposed / reduced by the effective microorganisms 12, the sludge 10 that has conventionally been generated in large quantities can be remarkably reduced. Therefore, an apparatus for treating industrial waste (excess sludge) becomes unnecessary. Final sludge generated (surplus sludge) can be reduced, and final treatment costs (expenses) such as dehydration, drying, incineration, and trading can be greatly reduced. Since the effective microorganisms 12 self-decomposes and disappears spontaneously after purification without using a chemical solution, there is no risk of secondary pollution, and safety to the environment (environment) can be improved. It does not require a large and expensive facility and does not require a large installation space, enabling a significant cost reduction. The purification capacity can be easily enhanced (substantial expansion) by simply adding small-scale equipment and effective microorganisms 12. Moreover, the bad smell from a processing facility can be reduced.

  In addition, after collecting sludge 10 to be decomposed / reduced in advance and creating or searching for effective microorganisms 12 suitable for decomposition / reducing effects on sludge 10, react with the created / identified effective microorganisms 12. Since it is applied to the sludge 10 contained in the tank 15 and the sludge 10 in the reaction tank 15 is decomposed and reduced, the sludge 10 that has conventionally been generated in large quantities can be significantly reduced. Therefore, the apparatus for industrial waste (excess sludge) treatment can be made compact. Final treatment costs (expenses) such as dewatering, drying, incineration, and trading of finally generated sludge (surplus sludge) can be greatly reduced. Since effective microorganisms 12 are self-degraded after purification and disappear spontaneously, there is no fear of secondary pollution, and safety to the surroundings (environment) can be improved. It does not require a large and expensive facility and does not require a large installation space, enabling a significant cost reduction. The purification capacity can be easily enhanced (substantial expansion) by simply adding small-scale equipment and effective microorganisms 12. Since the effective microorganisms 12 are intentionally (artificially) created or specified according to the type of dirt and the factory, there is no waste and it is possible to ensure a decomposition, weight reduction, and purification rate that is much more efficient than before. Also. Fast processing (decomposition, weight loss, purification) speed can be obtained. The generation of sludge 10 and odorous substances and undegraded materials can be greatly reduced, and adaptation to existing equipment can be facilitated, and sludge 10 can be reduced in response to complex components for each facility or factory. Stable degradation efficiency can be maintained because the effective microorganism 12 is administered. By using the optimized effective microorganism 12, it is possible to obtain a treatment capacity nearly 10 times that of the conventional activated sludge method alone. It can contribute to reduction of carbon dioxide emissions and energy saving. Moreover, the bad smell from a processing facility can be reduced.

  In addition, effective microorganisms 12 are Pseudomonas, Proteabacterium, Flavobacterium, Corynebacterium, Actinobacteria, Cytophaga, Nocardia, Alkaline Genes, Chromobacterium, Nitrosomonas, Nitrobacter, Zoglea, Bacillus, Acinetobacter, Oceanovacilus, Sermonadasi, Delphia Since the thermomonas are one kind or a combination of two or more kinds, the effective microorganisms 12 most suitable for reducing the sludge can be quickly identified. Regardless of the microorganisms contained in the sludge 10 to be treated, the effective microorganisms 12 that are optimal for weight reduction and decomposition can be obtained. Effective microbes 12 that are optimal for each sludge 10 generated from wastewater from various factories and facilities can be developed for each facility and plant unit, and finally each plant and facility has its own problems (oil removal, bad odor, etc.) It can respond quickly to the reduction of excess sludge (industrial waste) generated.

10 Sludge
12 Effective microorganisms
15 reactor

Claims (3)

  A sludge treatment method characterized by decomposing and reducing sludge (10) with effective microorganisms (12).   The sludge (10) to be decomposed / reduced is collected in advance, and after creating or searching for and identifying effective microorganisms (12) suitable for decomposition / reducing effects on the sludge (10), created or specified A sludge treatment method comprising applying the effective microorganism (12) to the sludge (10) contained in a reaction tank (15), and decomposing / reducing the sludge (10) in the reaction tank (15). .   The effective microorganism (12) is Pseudomonas, Proteabacterium, Flavobacterium, Corynebacterium, Actinobacteria, Cytophaga, Nocardia, Alkaline Genes, Chromobacterium, Nitrosomonas, Nitrobacter, Zoglea, Bacillus, Acinetobacter, Oceanovacils, Sermonadasi, The sludge treatment method according to claim 1 or 2, which is one or a combination of two or more of Delphia and Thermomonas.

Images