KR20070052968A - Sludge interation processing method that use clear water - Google Patents

Abstract

The present invention relates to a sludge integrated treatment method using fresh water.

The present invention is a sludge integrated treatment method for treating sludge generated in the process of selecting and treating the construction waste and sewage dredging sludge and sand, the fresh water pump through the foreign material removal unit of the construction waste, sewage dredged sludge treatment unit And fresh water supply step that is supplied to the sand sorting unit; The first sludge in the process of separating the aggregate and foreign matter contained in the construction waste in the foreign material removal unit of the construction waste by the fresh water supplied to the foreign material removal unit, the sewer dredged sludge treatment unit and sand sorting unit through the fresh water supply step. Sludge is generated so that the second sludge is generated in the process of pre-treatment of the sewage dredging sludge treatment unit, and in the sand sorting unit, the third sludge is generated in the process of sorting and producing sand. Steps; Each of the first, second and third sludges obtained in the sludge generation step is transferred to the sludge reaction tank by the first, second and third sludge transfer pumps, and the sludge aggregated by the coagulant is transferred to the settling tank without pressure. Sludge settling step to be precipitated by the difference in specific gravity; An agglomeration sludge transfer step of transferring the agglomerated sludge precipitated in the sludge settling step to a sludge concentrated agitation tank using a fourth sludge conveying pump; A dewatering step of pressurizing the concentrated sludge being stirred in the sludge concentrated stirring tank with a fifth sludge conveying pump to transfer the dewatered sludge to a filter press; A recycling step of transferring the water generated in the dehydration step to a settling tank to be recycled; Characterized in that the discharge step of discharging the caked sludge in the filter press.

Fresh water, sludge, reactor, flocculant, sedimentation, filter press

Description

Sludge integrated treatment method using fresh water {SLUDGE INTERATION PROCESSING METHOD THAT USE CLEAR WATER}

1 is a process chart of the sludge integrated treatment method using fresh water according to the present invention.

Figure 2 is a block diagram showing the process of the sludge integrated treatment method using fresh water according to the present invention.

3 is a block diagram of a system applied to the sludge integrated treatment method using fresh water according to the present invention.

<Brief description of symbols for the main parts of the drawings>

S10: fresh water supply step S20: sludge generation step

S30: sludge settling step S40: coagulated sludge conveying step

S50: dehydration step S60: recycling step

S70: discharge step 10: foreign material removal unit

11: first sludge 20: dredge sludge treatment unit

28: second sludge 30: sand sorting part

31: Third sludge 40: Precipitation tank

41: 4th sludge transfer pump 42: reactor

50: stirring tank 51: fifth sludge conveying pump

60: filter press 72: pump

85: coagulant tank 111: the first sludge conveying pump

281: 2nd sludge conveying pump 311: 3rd sludge conveying pump

The present invention relates to a sludge integrated treatment method using fresh water, in particular, to remove the foreign substances, including suspended solids, combustible waste and fine foreign substances from the construction waste to produce aggregates or to treat the sewage dredged sludge and sand contained in the crushed aggregates The product productivity by transferring each sludge and fine foreign substances generated in the process of sorting through the vertical improvement to one sludge settling tank to be precipitated, and condensed sludge and dewatering with a filter press for treatment. In addition, the space utilization rate can be increased, and at the same time, the sludge can be easily used as a raw material for producing lightweight building materials.

In general, the process of obtaining recycled aggregates from construction wastes is carried out by blowing air with a blower in the process of dropping construction wastes containing foreign matters on the inclined conveyor belt using a crusher and dropping them. In order to separate the foreign matter contained in the inside, but when separating the foreign matter by using a blower, there was a problem that the separated foreign matter is blown to the surroundings to pollute the environment.

In order to solve this problem, a conveyor belt loaded with crushed construction waste having foreign matters is passed through the tank so that foreign matters are separated due to buoyancy difference, but a large amount of sludge is in the process of separating foreign matters. There was a problem that occurred, there was a cumbersome problem that a separate sludge treatment apparatus for treating such sludge should be provided.

On the other hand, if the sewage dredged sludge is pre-treated and recycled, a large amount of sludge is generated along with severe odor from the dredged sludge, there is a problem that the sludge treatment apparatus as described above must be installed separately to treat such sludge.

In addition, when the sand contained in the crushed aggregate is recycled by particle size, a large amount of sludge is generated in the process of using the washing water to remove foreign substances such as soil, which is attached to the sand. In order to be able to be removed only through a separate sludge treatment apparatus.

Therefore, in order to remove foreign substances from construction waste at one place, separate sludge treatment apparatus must be installed in order to produce aggregate, treat sewage dredging sludge, and sort and recycle sand contained in crushed aggregate. There was a difficulty in securing the space that requires a lot of space in advance according to the installation process of each device. In addition, while the treatment efficiency is lowered in the process of separately dewatering the concentrated sludge, there was a problem that the operating cost is high.

The present invention has been created to solve the above problems, each of the suspended solids generated in the process of removing the foreign material from the construction waste to produce aggregate or the process of sewage dredged sludge and the sand contained in the crushed aggregate. The sludge is transported to a single sludge settling tank to be settled, and the sludge is concentrated and dehydrated with a filter press to facilitate the disposal of light sludge. The purpose is to provide a sludge integrated treatment method using fresh water.

In order to achieve the above object, the present invention provides a sludge integrated treatment method for treating sludge generated in the process of selecting and treating construction waste, sewage dredging sludge and sand, wherein the fresh water is constructed through a pump 72. And the fresh water supply step (S10) of being supplied to the foreign material removal unit 10, the sewer dredged sludge treatment unit 20 and the sand sorting unit 30 of the; In the debris removal unit 10 of the construction wastes by the fresh water supplied to the debris removal unit 10, the sewer dredged sludge treatment unit 20 and the sand sorting unit 30 through the fresh water supply step (S10). The first sludge 11 is generated in the process of separating the aggregate and foreign matter contained in the construction waste, so that the second sludge 28 is generated in the process of pre-treating sewage dredging sludge in the sewage dredging sludge treatment unit 20. And, in the sand sorting unit 30, the sludge generating step (S20) to generate a third sludge 31 in the process of selecting and producing sand; The first, second and third sludges 11 and 28 and 31 obtained in the sludge generating step S20 are sludge reaction tanks by the first, second and third sludge conveying pumps 111, 281 and 311. A sludge settling step (S30) for feeding the flocculant to 42 and transferring the sludge aggregated by the flocculant to a settling tank 40 in a pressureless state to be precipitated at a specific gravity difference; Aggregate sludge transfer step (S40) to be transferred to the sludge concentrated agitation tank (50) by using the fourth sludge transfer pump 41, the flocculation sludge precipitated in the sludge precipitation step (S30); A dewatering step (S50) of pressurizing the concentrated sludge being stirred in the sludge concentrated stirring tank (50) to a filter press (60) to pressurize the concentrated sludge; Recycling step (S60) for the water generated in the dehydration step (S50) is transported to the settling tank 40 to be recycled; Characterized in that the discharge step (S70) for discharging the caked sludge from the filter press (60).

In addition, the fresh water is characterized in that the dilute sulfuric acid solution having a concentration of 70% is mixed.

In addition, in the process of pre-treating the sewage dredging sludge is characterized in that the deodorant and the fragrance is mixed.

In addition, the flocculant is characterized by consisting of a liquid to agglomerate the sludge into small particles, and a polymer to agglomerate the sludge aggregated into small particles by the liquid larger.

And the object is achieved by providing a sludge integrated treatment method using fresh water, characterized in that the concentrated sludge dehydrated by the filter press 60 is made of less than 1 ~ 30% water content.

Hereinafter, an embodiment according to the present invention will be described with reference to the accompanying drawings.

Sludge integrated treatment method according to the present invention, as shown in Figures 1 to 3, comprising a large amount of suspended solids, flammable waste and fine foreign matter generated in the process of treating the construction waste and sewage dredged sludge and sand. First, the fresh water is supplied to the fresh water supply step (S10), so that the fresh water is always filled with a predetermined amount inside the fresh water tank (70) through the ground water inlet (71). The groundwater, which is the fresh water in the fresh water tank 70, is supplied to the foreign matter removing unit 10, the sewer dredged sludge treatment unit 20, and the sand sorting unit 30 through the pump 72, respectively. It is done.

At this time, the inside of the fresh water tank 70 to increase the washing effect of the sand, by neutralizing the strong alkali generated from the construction waste by adding a predetermined amount of the dilute sulfuric acid solution contained in the additive tank 80 installed on the outside. It is desirable to have.

In addition, the dilute sulfuric acid solution is preferably to have a concentration of 65 to 75%, particularly preferably to have a concentration of 70%. When such a dilute sulfuric acid solution is added to fresh water, the acidity becomes about PH7-8.

Next, as the sludge generation step (S20) through the fresh water supply step (S10) the construction waste by the fresh water supplied to the foreign material removal unit 10 and the sewer dredged sludge treatment unit 20 and the sand sorting unit 30 through the fresh water supply step (S10). The foreign material removal unit 10 of the first and second sludge 11 is generated in the process of separating the foreign matter including aggregate and suspended matter, flammable waste and fine foreign matter contained in the construction waste, the sewage dredged sludge treatment unit 20 The second sludge 21 is generated in the process of pre-treating sewage dredging sludge, and the third sorting sludge 31 is generated in the sand sorting unit 30 in the process of improving the granularity of sand. You lose.

At this time, the process of removing the foreign matter by the fresh water supplied to the foreign matter removal unit 10 of the construction waste is the ground powder and crushed construction waste introduced from the hopper not shown through the soil removal screen 12 and The fine aggregate of 25 mm or less is separated, and the separated fine aggregate and soil powder are discharged to the outside through the soil conveying conveyor belt 121.

As the remaining aggregate from which fine aggregate is separated is supplied to the separation remove tank 13, foreign matter separated from the aggregate due to the difference in specific gravity is floated to the surface of the water treatment tank 13, and the foreign matter (floating) Substances and flammable foreign substances) are overflowed to the dehydration vibration screen 15 by the discharge conveyor 14 installed with the scrap bar together with water and then discharged to the outside through the dehydration process.

The fine foreign matter contained in the water generated during the dehydration process is separated from the fine foreign matter less than 1mm through the fine foreign matter dehydration vibration screen 16, and the sludge and water generated at this time are introduced into the flow control tank 17, and the flow rate The sludge and water introduced into the reservoir 17 are then passed through the first and second sludge settling tanks 171 and 172.

The fine foreign matters selected by the fine foreign matter vibrating screen 16 are sent to the soil removing screen 12 through the first and second floating material recycling conveyor belts 161 and 162 to be removed while being circulated.

Aggregate from which foreign matter is removed while passing through the water treatment tank 13 passes through the chute 181 while being transported on the aggregate discharge conveyor 18 being transferred from the lower portion of the water treatment tank 13 to the upper portion. Is discharged from the outside.

While removing the foreign matter contained in the aggregate in the interior of the water treatment tank 13 and the fine foreign matter on the surface of the aggregate is separated from the aggregate is accumulated in the lower portion of the water treatment tank 13 as the sediment-shaped first sludge 11. In this case, the generated first sludge 11 is sent to the flow rate adjusting tank 17 by the conveying screw 19 rotated at the bottom thereof, followed by the first sludge settling tank 171 and the second sludge settling tank 172. Is transferred to.

At this time, the first sludge 11 discharged by the conveying screw 19 is discharged to the fine foreign matter dewatering screen 16, and after the fine foreign matter is removed, only the sludge of 1 mm or less is sent to the flow rate adjusting tank 17.

In addition, the process of pre-treatment of the dredged sludge in the interior by the fresh water supplied to the sewage dredged sludge treatment unit 20 is the input port of the dredged sludge stored in the sewer dredged sludge storage tank 29 (pretreatment tank 21). When introduced into the interior through 211, the mixture is mixed by the mixing screw 22 being rotated at a constant speed in the lower portion of the pretreatment tank 21, and the deodorant supply unit 23 and the fragrance supply unit 24 provided at the rear thereof. ) Is always supplied with a certain amount of deodorant and fragrance to remove the peculiar smell of dredged sludge.

At this time, the fresh water is continuously supplied to increase the mixing rate of the dredged sludge, and the dredged sludge from which the odor has been removed is transferred forward along the inclined bottom plate 25, and then the pressureless nature is coupled to the end of the bottom plate 25. The outlet 26 is discharged to the fine foreign matter dewatering screen 16, and the fine foreign matter of 1 mm or more of the discharged quaternary sludge may be disposed between the first and second floating material recycling conveyor belts 161 and 162 and the soil removal screen 12. In addition, the second sludge 28 pretreated in this process is passed through the fine foreign matter dewatering screen 16 by the second sludge transfer pump 281 in a state in which sand is mixed when natural discharge of the pressureless state is impossible. The fine foreign matter of 1 mm or more and the second sludge 28 are separated, and the separated fine foreign matter passes through the first and second floating material recycling conveyor belts 161 and 162 and the soil removal screen 12. 2 sludge (28) The amount is adjusted to the tank 17, the first sludge settling tank 171 and the second sludge settling tank 172.

On the other hand, in the sand sorting unit 30 by crushing the construction waste with a not shown concave crusher to sort the sand of 6mm or less, 18mm or less is re-crushed by a sand crusher, 25mm or less is shredded with a concrete crusher .

The shredded construction wastes are sorted by the particle size through the sand screen and washed, and the third sludge 31 and the fine foreign matter, which are sand and sludge fine powder generated in the sorting process, are passed through the classifier 32, respectively. After being separated, the third sludge 31 and fine particles of 1 mm or more are separated and removed through the fine foreign matter removal vibrating screen 33. The third sludge 31 generated at this time is precipitated in the sludge settling tank 40 via the sludge reaction tank 42.

Next, as the sludge settling step (S30), each of the first, second and third sludges 11, 28 and 31 obtained in the sludge generating step (S20) is the first, second and third sludge transfer pumps 111 ( 281) and 311 are transferred to the sludge reaction tank 42 and then aggregated by the coagulant introduced through the coagulant tank 85, and the aggregated sludge is transferred to the sludge settling tank 40 without pressure. Allow the difference to settle.

The washing water consumed in this process is overflowed to the fresh water tank 70 is recycled, and the liquid and polymer are supplied from the coagulant tank 85 and mixed with each other, thereby agglomerated into small particles sludged by the liquid, The sludge agglomerated into small particles by the polymer is more agglomerated and settles to the bottom of the sludge settling tank 40.

Sludge precipitated on the bottom of the sludge settling tank 40 through this process is to be transferred to the sludge concentrated agitation tank 50 through the fourth sludge transfer pump 41. (agglomeration sludge transfer step (S40))

Next, as the dehydration step (S50), the concentrated sludge being stirred in the sludge concentrated stirring tank 50 is transferred to the filter press 60 using the fifth sludge conveying pump 51 to be dewatered. In this process, the concentrated sludge dehydrated by the filter press 60 is preferably made to have a water content of less than 1 to 30%.

Next, the caked concentrated sludge dehydrated by the filter press 60 after the recycling step S60 for transferring the water generated in the process of dewatering the concentrated sludge to the sludge settling tank 40 to be recycled. Concentrated sludge discharge step (S70) to discharge the waste from the construction waste to remove aggregates to produce aggregates or sewage dredged sludge pretreated and each sand generated in the process of sorting the sand contained in the crushed aggregates as one It can be collected and processed easily.

As described above, the present invention provides each sludge generated while being supplied to the debris removal device including the floating material and the combustible material contained in the construction wastewater which can be treated eco-friendly, and the sewage dredging pretreatment stirring device and the sand production device. By collecting and agglomerating in the place and dewatering the sludge with a filter press so that the water content is less than 30%, it increases the productivity of aggregates and sand, etc., and disposes sludge as a by-product generated in the process of producing the product. It can be made easier, and further effects can be obtained that can be used as raw materials for producing lightweight construction materials.

Claims (5)

In the sludge integrated treatment method for treating sludge generated in the process of sorting and treating construction waste, sewage dredging sludge and sand, Fresh water supply step (S10) is supplied to the fresh water removal unit 10, the sewer dredged sludge treatment unit 20 and the sand sorting unit 30 through the pump 72, respectively; In the debris removal unit 10 of the construction wastes by the fresh water supplied to the debris removal unit 10, the sewer dredged sludge treatment unit 20 and the sand sorting unit 30 through the fresh water supply step (S10). The first sludge 11 is generated in the process of separating the aggregate and foreign matter contained in the construction waste, so that the second sludge 28 is generated in the process of pre-treating sewage dredging sludge in the sewage dredging sludge treatment unit 20. And, in the sand sorting unit 30, the sludge generating step (S20) to generate a third sludge 31 in the process of selecting and producing sand; The first, second and third sludges 11 and 28 and 31 obtained in the sludge generating step S20 are sludge reaction tanks by the first, second and third sludge conveying pumps 111, 281 and 311. A sludge settling step (S30) for feeding the flocculant to 42 and transferring the sludge aggregated by the flocculant to a settling tank 40 in a pressureless state to be precipitated at a specific gravity difference; Aggregate sludge transfer step (S40) to be transferred to the sludge concentrated agitation tank (50) by using the fourth sludge transfer pump 41, the flocculation sludge precipitated in the sludge precipitation step (S30); A dewatering step (S50) of pressurizing the concentrated sludge being stirred in the sludge concentrated stirring tank (50) to a filter press (60) to pressurize the concentrated sludge; Recycling step (S60) for the water generated in the dehydration step (S50) is transported to the settling tank 40 to be recycled; Sludge integrated treatment method using fresh water, characterized in that made in the discharge step (S70) for discharging the caked sludge from the filter press (60). The method of claim 1, The fresh water is sludge integrated treatment method using fresh water, characterized in that the mixed sulfuric acid solution having a concentration of 70%. The method of claim 1, Sludge integrated treatment method using fresh water, characterized in that the deodorant and the fragrance is mixed in the pre-treatment of the sewer dredged sludge. The method of claim 1, The flocculant is a sludge aggregate treatment method using a fresh water, characterized in that the flocculation is composed of a liquid to aggregate the sludge into small particles, and the polymer to further aggregate the sludge aggregated into small particles by the liquid. The method of claim 1, Concentrated sludge dewatered by the filter press (60) is a sludge integrated treatment method using fresh water, characterized in that the water content is less than 1 ~ 30%.

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