KR100993939B1 - A mixture for recycling sludge and treatment thereof and apparatus the same - Google Patents

Abstract

The present invention relates to a sewage sludge treatment method and apparatus thereof, in particular, to prepare a mixed sludge having a water content of 50 to 55% by mixing sewage sludge, crushing the prepared mixed sludge with a crusher, and the crushed mixed sludge with a vibrator ( The vibrator is characterized in that the conveying while giving a vibration, the conveyed mixed sludge is dried and pulverized to separate the solids and water. According to the present invention, when the mixed sludge is crushed and conveyed while giving a vibration, there is an effect that the production efficiency can be significantly increased than in the prior art.

Sewage Sludge, Crushers, Vibrators

Description

Sewage sludge treatment method and apparatus {A mixture for recycling sludge and treatment etc and apparatus the same}

The present invention relates to a method and a device for treating sewage sludge, and in particular, when the mixed sludge mixed with sewage sludge is dried and pulverized immediately, conventionally, the mixed sludge agglomerates and adheres to the bottom of the grinder and grinder. Thereby effectively obtaining a greater amount of recyclable byproducts.

Currently, huge amounts of sewage sludge are continuously generated in sewage treatment plants, and the most common treatment method for treating such sewage sludge is landfilling in wasteland or landfills.

However, because the waste land and landfills have a limited landfill area, landfilling is not free and the landfill permit conditions are very demanding. In addition, since a large amount of waste from other fields is buried together, the place for landfill is rapidly depleted, and there are many difficulties in selecting landfill sites, causing local conflicts and social problems. In addition, although the sewage sludge is dewatered and dried to some extent before being landfilled, the water content is high. However, the landfill leachate that causes odor and toxic gas to contaminate the air and permeates the ground causes contamination of groundwater.

In this regard, the Republic of Korea Patent No. 10-0797574 (name of the invention: sewage sludge recycling treatment method) is a pre-treatment step of supplying the sewage sludge is supplied uniformly mixed with a mixer to a water content of 55 ~ 60%, and The sewage sludge supplied through the pretreatment process is a rotary impact type drying and pulverizer with a high-speed centrifugal force. The drying and pulverization process separates the particulate solids and water having a moisture content of 5%, and the particulate solids separated in the drying and crushing process to the outside. Discharging wastewater sludge recycling process characterized in that it comprises a discharge step of discharging, and a scrubber step of separating the water separated in the drying and grinding step into a gas and a liquid and discharged to the outside, respectively.

However, in the case of drying and pulverizing the mixed sludge, which has undergone the pretreatment process according to the registered patent No. 10-0797574, immediately by a rotary impact type drying and pulverizer using a high-speed centrifugal force, the mixed sludge does not have a uniform distribution of moisture in the form of lumps. When crushed in the drying and grinder, the watery crushed mass has caused a serious problem of sticking to the drying and grinder bottom. Accordingly, not only the amount of particulate solids actually separated is significantly smaller, but also the continuous operation is impossible because the drying and the inside of the grinder must be cleaned every time.

Accordingly, the present invention is to solve the problem that the mixed sludge agglomerates and adheres to the bottom of the mill and grinder when the mixed sludge is dried and pulverized as in the prior art, to effectively obtain a larger amount of recyclable by-products.

Sewage sludge treatment method according to the present invention for achieving the above object comprises the steps of preparing a mixed sludge by mixing sewage sludge; Crushing the prepared mixed sludge with a crusher; And drying and pulverizing the crushed mixed sludge to separate solids and water.

In addition, another example of the sewage sludge treatment method according to the present invention comprises the steps of preparing a mixed sludge by mixing sewage sludge; Crushing the prepared mixed sludge with a crusher; Transferring the crushed mixed sludge with vibration to a vibrator; And drying and pulverizing the conveyed mixed sludge to separate solids and moisture.

In the present invention, drying and pulverizing the mixed sludge, the mixed sludge is supplied to the drying and pulverizer in a predetermined amount with a feed control hopper, and the injected mixed sludge is dried and pulverized by particle collision energy by centrifugal force. It is preferable.

In addition, the sewage sludge is a sewage sludge having a water content of 75 to 80% and sewage sludge having a water content of 5 to 10% is mixed at a ratio of 1.5: 1 to 2.5: 1, and the sewage sludge having a water content of 5 to 10% is separated from the sewage sludge. It is more preferable that it is solid content.

On the other hand, according to another embodiment of the present invention, a sewage sludge treatment apparatus includes a mixer for mixing sewage sludge to produce mixed sludge; A crusher for crushing the mixed sludge produced by the mixer; And a drying and pulverizer for drying and pulverizing the mixed sludge crushed by the crusher to separate solids and water.

Specific details of other embodiments are included in the detailed description and the drawings.

According to the present invention, the mixed sludge is crushed by a crusher, and more preferably, the crushed mixed sludge is transferred while vibrating with a vibrator, and after the mixed sludge is dried and pulverized, There is an effect that can significantly increase the production than conventional.

In addition, according to the present invention described above, since the mixed sludge does not clump and adhere to the bottom of the mill and the grinder, it is possible to enable continuous operation without having to clean the interior of the mill and the grinder each time.

Hereinafter, one preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a schematic diagram for explaining the overall configuration of the sewage sludge treatment apparatus according to an embodiment of the present invention, as shown here, sewage sludge treatment apparatus according to the present invention, natural sewage sludge, that is, raw sludge It may include a raw sludge storage tank (1) for storing the powder sludge storage tank (2) for storing the particulate solid sludge, and a meter (3) for measuring the raw sludge and powder sludge, respectively.

In addition, the sewage sludge treatment apparatus according to the present invention includes a mixer 4 for mixing raw sludge and powder sludge, a coarse crusher 5 for crushing the mixed sludge mass, and the finely broken sludge tangled together again. In order to prevent the phenomenon, the vibrator 6 for transporting the sludge by vibration, the feed control hopper 7 for uniformly supplying the transported sludge to the drying and grinder, the drying to discharge the powder sludge by drying and grinding the supplied sludge It is also possible to include a grinder 8, a conveying device 9 for sending powder sludge to a storage tank, a scrubber 10 for collecting air pollutants and odor elements discharged from each device and a dry grinder.

2 is a flow chart for explaining the overall process of the sewage sludge treatment method according to an embodiment of the present invention, as shown here, the sewage treatment method according to the present invention, first, the raw sludge storage tank (1) After the raw sludge and powder sludge stored in each of the powder sludge storage tanks 2 are weighed by the meter 3 (S10), the step of adding the metered mixed sludge to the mixer 4 (S20) may be performed. .

The present invention relates to a method for treating sewage sludge, and in particular, a method for recycling mixed sludge having a water content of 50 to 55%. To this end, although the mixed sludge having a water content of 50 to 55% as a raw material may be sewage sludge in a natural state, it is also possible to use mixed sludge in which powdered sludge is mixed together with the raw sludge. At this time, it is preferable to weigh the raw sludge and the powder sludge to a certain ratio and put them in the mixer 4, but when the raw sludge has a water content of 75 to 80%, the water content of the mixed sludge mixed with the powder sludge is 50 to 55 It was confirmed that the percentage of production can maximize production efficiency. The mixed sludge thus mixed forms a water content according to the water content of the raw sludge and the powder sludge, and is always discharged in a lump state from the mixer 4.

Conventionally, the mixed slurry discharged in the agglomerate state is dried and pulverized by a high-speed centrifugal force rotary impact drying and pulverizer, but in this case, when the mixed sludge is in the form of a lump and the moisture distribution is not uniform, it is crushed in the drying and pulverizer. As a result, the crushed mass of water caused a serious problem of drying and sticking to the bottom of the grinder.

In order to solve this problem, the sewage sludge treatment method according to the present invention is characterized in that it comprises a step (S30) of crushing the prepared mixed sludge with a crusher (5), the sewage sludge treatment apparatus according to the present invention by the mixer It is characterized by including a crusher 5 for crushing the produced mixed sludge.

In other words, when the mixed sludge agglomerated into a lump is directly dried and pulverized as in the prior art, the initial stage of the drying and pulverizer takes precedence as a crusher rather than a drying function, and the mixed sludge lump is not uniform in water distribution. Therefore, when crushed in the drying and grinder, the drying performance efficiency of more than 50% is lowered because the juicy crushed mass clings to the bottom of the drying and grinder.

However, prior to the process of crushing the mixed sludge with the crusher 5 prior to the drying and grinding process according to the present invention, the mixed sludge is dried and crushed in the form of broken granules rather than in a lump state. This will solve the problem of the moisture crushed lumps to dry and cling to the bottom of the grinder. Through this, it was confirmed that significantly more recycling by-products can be obtained than before.

On the other hand, the present inventors crush the mixed sludge with the crusher 5 as described above and then transfer it to the drying and mill 8, the granules broken in the transfer process is recombined again before being put into the drying and mill I found that losing happened. Accordingly, another feature of the present invention is characterized by crushing the mixed sludge with the crusher 5, as shown in Figure 3, and then transfer the crushed sludge by vibrating the vibrator (6) (S31) It is done. Thus, the crushed sludge is mixed evenly with the powder sludge which has not been mixed yet, and at the same time, finely crushed sludge can be prevented from being entangled again. According to the present invention, not only can a remarkably more recycled by-product be obtained than in the prior art, but also a higher production efficiency can be achieved than crushing the mixed sludge and then transferring it to the drying and mill 8.

Subsequently, the sludge passed through the crusher 5 as described above, or transferred to the vibrator 6 via the crusher 5 may be introduced into the drying and grinder 8 to undergo a drying and grinding process, more preferably. As shown in FIG. 4, it is most preferable that the conveyed sludge is adjusted by a uniform amount by the supply control hopper 7 and introduced into the drying and grinder 8 (S32).

That is, the feeding conveyor of the feed control hopper 7 is preferably designed in such a way that the sludge mixed at a position higher than at least 10 cm from the inlet of the drying and grinder 8 falls. The mixed sludge is adjusted to a uniform amount by the feed control hopper 7 and enters the chamber 8-1 through the inlet of the dry mill 8, which feed control hopper 7 is a method and apparatus according to the invention. Can contribute to continuous production, production efficiency and system stabilization.

Accordingly, the sewage sludge treatment apparatus according to the present invention preferably further includes a vibrator 6 which vibrates and conveys the mixed sludge crushed by the crusher 5, more preferably the vibrator. It is suitable to further include a feed control hopper 7 which feeds the mixed sludge conveyed by (6) to the drying and grinder in a predetermined amount.

Subsequently, the sludge introduced into the drying and pulverizer 8 falls into the chamber 8-1, and the sludge temperature rises due to the composite impact kinetic energy of particles using high-speed rotation, thereby rapidly evaporating the sludge and removing moisture. Is done. In addition, the composite shock ensures that the moisture in the particles is squeezed from the solids, and the impact energy and kinetic heat can kill many pathogens in the sludge. In this way, the drying and crusher 8 can dry the sludge particles by the particle collision by powerful high-speed rotation to separate the solid content and the moisture, thereby producing powder sludge. After being transferred to the belt 11 by the transfer device 9 and stored in the powder sludge storage tank 2, it may be recycled again (S40).

Accordingly, in the present invention, it is preferable that the sewage sludge is mixed with sewage sludge with a water content of 75 to 80% and sewage sludge with a water content of 5 to 10% in a ratio of 1.5: 1 to 2.5: 1 as described in the following examples. And, the sewage sludge of the water content of 5 to 10% may be to recycle the solids separated by the drying and the crusher (8).

Finally, the moisture separated by the drying and mill 8 is separated in the form of steam is discharged through the air vent (8-2), dust collected by the external scrubber (10) to dust, air pollutants and odor elements It may be processed (S50).

The invention may be better understood by the following examples, which are intended for purposes of illustration of the invention and are not intended to limit the scope of protection defined by the appended claims.

Comparative Example 1 In the case of drying and grinding with raw sludge having a water content of 75%

In this comparative example, the raw sludge having a water content of 75% and a powder slurry of 50% or 55% of water content mixed with 5% or 10% water content sludge were used, and the treatment was performed in the order shown in FIG. 5. As the powder sludge, the fine solid separated in the drying and pulverizer was used, and the mixed sludge mixed in the mixer was directly put into the drying and pulverizer.

Specifically, the amount of raw sludge and powder sludge used, the operating time of the mixer for mixing, the throughput according to the time and the production efficiency according to the above are summarized in Table 1 and Table 2 below.

[Table 1: Dry and ground by mixing raw sludge with 75% water content and powder sludge with 5% water content]

[Table 2: Dry and ground by mixing raw sludge with 75% moisture content and powder sludge with 10% moisture content]

Comparative Example 2: In the case of drying and grinding with raw sludge having a water content of 80%

This comparative example is the same as the said comparative example 1 except having used the raw sludge of 80% of water content. Specifically, the amount of raw sludge and powder sludge used, the operating time of the mixer for mixing, the throughput according to the time and the production efficiency according to the above are summarized in Table 3 and Table 4 below.

[Table 3: When dried and ground by mixing raw sludge with a water content of 80% and powder sludge with a water content of 5%]

[Table 4: Drying and grinding by mixing raw sludge with water content of 80% and powder sludge with water content of 10%]

Summary of results of Comparative Examples 1 and 2

Based on the experimental results of Comparative Examples 1 and 2 described above, the averages of the production efficiency were obtained based on Tables 1 to 4, and the slurry states immediately before the drying and grinding processes were summarized in Table 5 below.

[Table 5: When the mixed slurry is dried and ground immediately]

As shown in Table 5, when the mixed slurry was immediately dried and pulverized, the average production efficiency was only about 10 to 20%, and when the mixed slurry had a moisture content of 55%, the mixed sludge was not mixed well and was in the form of rice cakes. This resulted in a condition in which the drying and sticking to the bottom of the mill continued undrying and continuous operation was impossible.

Example 1 In case of drying and pulverizing after passing through a crusher with raw sludge having a water content of 75%

In this embodiment, the raw sludge having a water content of 75% and a powder slurry having a water content of 50% or 55% mixed with 5% or 10% water content of sludge were used and treated in the order shown in FIG. 6. As the powder sludge, the fine solid separated in the drying and pulverizer was used, and the mixed sludge mixed in the mixer was directly put into the drying and pulverizer.

Specifically, the amount of raw sludge and powder sludge used, the operating time of the mixer for mixing, the throughput according to the time and the production efficiency according to the above are summarized in Table 6 and Table 7 below.

[Table 6: When raw sludge with 75% moisture content and powder sludge with 5% moisture content are mixed, crushed, dried and ground]

[Table 7: When raw sludge with 75% moisture content and powder sludge with 10% moisture content are mixed, crushed, dried and ground]

Example 2 In case of drying and pulverizing after passing through a crusher with raw sludge having a water content of 80%

This embodiment is the same as the first embodiment except that raw sludge having a water content of 80% is used. Specifically, the amount of raw sludge and powder sludge used, the operating time of the mixer for mixing, the throughput according to the time and the production efficiency according to the above are summarized in Tables 8 and 9 below.

[Table 8: When raw sludge with 80% moisture content and powder sludge with 5% moisture content are mixed, crushed, dried and ground]

[Table 9: When raw sludge with a water content of 80% and powder sludge with a water content of 10% are mixed, crushed, dried and ground]

Results summary of Examples 1 and 2

Based on the experimental results of Examples 1 and 2 described above, the average of the production efficiency was calculated based on Tables 6 to 9, and the slurry states immediately before the drying and grinding processes were summarized in Table 10 below.

Table 10: When the mixed slurry is crushed, dried and pulverized

As shown in Table 10, when the mixed slurry was crushed to dry and pulverized, the average production efficiency reached about 72 to 86%, which is a remarkably superior effect more than four times compared to the case of directly drying and pulverizing the mixed slurry. . Only the granules that were broken and crushed by the shredder were partially recombined and agglomerated before being put into the dry mill, and this was analyzed to reduce the production efficiency.

Example 3 When the raw material is passed through a crusher with 75% water content, transferred by vibrator, and then dried and ground

In this embodiment, the raw sludge having a water content of 75% and a powder slurry having a water content of 50% or 55% mixed with 5% or 10% water content sludge were used, and the treatment was performed in the order shown in FIG. 7. As the powder sludge, the fine solid separated in the drying and pulverizer was used, and the mixed sludge mixed in the mixer was directly put into the drying and pulverizer.

Specifically, the amount of raw sludge and powder sludge used, the operating time of the mixer for mixing, the throughput according to the time and the production efficiency according to the above are summarized in Table 11 and Table 12 below.

[Table 11: When raw sludge with 75% moisture content and powder sludge with 5% moisture content were mixed, passed through a crusher, transferred by vibrator, dried and ground]

[Table 12: When raw sludge with 75% moisture content and powder sludge with 10% moisture content were mixed, passed through a crusher, transferred by vibrator, dried and ground]

Example 4 When the raw material is passed through a crusher with 80% moisture content, transferred by vibrator, and then dried and ground

This embodiment is the same as the third embodiment except that raw sludge having a water content of 80% is used. Specifically, the amount of raw sludge and powder sludge used, the operation time of the mixer for mixing, the throughput according to the time and the production efficiency according to the above are summarized in Table 13 and Table 14.

Table 13: When raw sludge with a water content of 80% and powder sludge with a water content of 5% are mixed, passed through a crusher, transported by a vibrator, dried and ground]

Table 14: When raw sludge with a water content of 80% and powder sludge with a water content of 10% are mixed, passed through a crusher, transported by a vibrator, and then dried and pulverized.

Results summary of Examples 3 and 4

Based on the results of the experiments of Examples 3 and 4, based on Tables 11 to 14, the average of the production efficiency was obtained, and the slurry state immediately before the drying and grinding processes are summarized in Table 15 below.

Table 15: When the mixed slurry is crushed and then transferred by vibrator, then dried and ground

As shown in Table 15, when the mixed slurry was crushed, then transferred by vibrator, dried and pulverized, the average production efficiency reached about 83 to 96%, which was 5 compared with the case of directly drying and pulverizing the mixed slurry. It is a remarkably superior effect of more than twice. It was analyzed that the finely crushed and broken granules by the crusher were transferred by the vibrator to prevent the recombination and agglomeration before being put into the drying and pulverizer, thereby improving the production efficiency.

On the other hand, while the present invention has been shown and described with respect to certain preferred embodiments, the invention is variously modified and modified without departing from the technical features or fields of the invention provided by the claims below It will be apparent to those skilled in the art that such changes can be made.

The present invention can provide a sewage sludge treatment method and apparatus that can significantly increase the production of the separated solids by crushing and conveying the mixed sludge with vibration.

1 is a schematic diagram for explaining the overall configuration of the sewage sludge treatment apparatus according to an embodiment of the present invention,

2 is a flowchart illustrating the overall process of the sewage sludge treatment method according to an embodiment of the present invention,

3 is a detailed view for explaining in detail an example of a crusher and vibrator according to the present invention,

Figure 4 is a detailed view for explaining an example of the supply adjustment hopper of the present invention in detail,

5 is a flow chart showing a sewage sludge recycling treatment method according to the prior art,

6 is a flowchart for explaining a first embodiment of the sewage sludge treatment method according to the present invention;

7 is a flowchart for explaining a second embodiment of the sewage sludge treatment method according to the present invention.

Claims (5)

Mixing the raw sludge having a water content of 75 to 80% and the powder sludge having a water content of 5 to 10% with a mixer to discharge the mixed sludge mass with a water content of 50 to 55%; Crushing the mixed sludge mass into granulated mixed sludge through a crusher; A vibrating transfer step of conveying the crushed granular mixed sludge with a vibrator while vibrating to remix the original sludge and the powder sludge, and preventing the granular mixed sludge from tangling again; And And drying and pulverizing the mixed sludge passed through the vibration conveying step through a pulverizer and separating the solid sludge and water into sewage sludge. delete The method of claim 1, wherein the drying and grinding of the mixed sludge, Sewage sludge treatment method characterized in that the mixed sludge is fed to the drying and crusher in a predetermined amount with a feed control hopper, and the injected mixed sludge is dried and pulverized by particle collision energy by centrifugal force. According to claim 1, The sewage sludge is a sewage sludge having a water content of 75 to 80% and a sewage sludge having a water content of 5 to 10% is mixed in a ratio of 1.5: 1 to 2.5: 1, The sewage sludge treatment method, characterized in that the sewage sludge having a water content of 5 to 10% is the separated solid content. A mixer for mixing raw sludge having a water content of 75 to 80% and powder sludge having a water content of 5 to 10% to produce a mixed sludge mass having a water content of 50 to 55%; A crusher for crushing the mixed sludge mass produced by the mixer into granulated mixed sludge; A vibrator for conveying the crushed granular mixed sludge with vibration to remix the original sludge and the powder sludge and to prevent the mixed sludge of the granular form from being entangled again; And And a drying and pulverizer for drying and pulverizing the mixed sludge crushed by the crusher to separate the solids and the water into sewage sludge treatment apparatus.

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