KR101342551B1 - The Equipment of Reduction Sludge Dewatering Water Content Rate to Total Solids Improvement in Unity Sludge Tank and Belt Press Filter on the Upper and Lower Percolate using High Pressure Cleaning Water Supply - Google Patents

Abstract

The present invention improves solids (TS) concentration to 3-7% in a single mixed sludge storage tank by eliminating the sludge concentration tank in the treatment of waste sludge generated from the first settling or final settling in the wastewater treatment facility. In order to remove clogging on upper and lower filter cloth mesh of (Belt Press Filter), high water pressure was supplied to the nozzle to reduce the moisture content of dewatered sludge.

Description

Dehydration Sludge Moisture Reduction Device and Method for Reducing Sludge Dewatering Water Content Rate of Total Solids in Single-Mixed Sludge Reservoir Unity Sludge Tank and Belt Press Filter on the Upper and Lower Percolate using High Pressure Cleaning Water Supply}

The present invention is to install a single mixed sludge storage tank of sludge (raw sludge and surplus sludge) disposed from the first or the final sedimentation basin in the wastewater treatment facility to improve the total solid concentration and to remove the clogging phenomenon of the upper and lower filter cloth for dewatering. The present invention relates to a dewatered sludge moisture content reducing device for supplying high pressure washing water to a nozzle.

In particular, sludge (raw sludge and surplus sludge) from the initial or final settler is improved in total mixed solids concentration (0.4% 3 ~ 7%) in a single mixed sludge storage tank, and the mesh of dewatering filter cloth (upper and lower part) In order to prevent the porosity from being weakened (clogging phenomenon), high pressure washing water is supplied to the nozzle to produce dewatered sludge with a stable water content.

In general, dewatered sludge produced and discharged in the wastewater treatment process is treated with marine dumping, direct landfill, or cover soil, but sludge (organic sludge) was revised in accordance with the Enforcement Regulations of the Marine Pollution Prevention Act in February 2006. As marine discharge regulations for sewage have been tightened significantly, dewatered sludge must be treated on land.

Therefore, we invest in facilities to reduce water content of dewatered sludge after dehydration, which is a problem in all sewage and wastewater treatment plants, and we invest in facilities to improve and diversify the dewatered sludge treatment. For the response system, the total solids concentration (TS) of the mixed sludge must be improved and the dehydrator operating system must be improved to reduce the dewatered sludge moisture content.

However, the reason why the dehydrated sludge with high moisture content is produced in the treatment of dewatered sludge produced in the wastewater treatment process is to reduce the total solid concentration (TS), excess sludge amount, sludge organic / inorganic content, solid The method of improving the dehydration rate by characterizing the care-burn ratio (SiO ₂ / Al ₂ O ₃ : content of solid particles in the cake), component ratio, particle shape, and sludge has not been properly applied. Because.

However, without identifying the correlation between the physical and chemical properties of sludge and dehydration rate, it is difficult to actively cope with the environmental policy direction, since the sludge reduction and low water content dewatering sludge production is not possible. It is inextricably linked with the recycling industry.

Those developed and filed for this purpose are dewatering devices as described in the following documents. This is to dewater the sludge with the water content of 99.5 ~ 99.8% of sludge by using multiple rollers and belts (filters) by the belt press dehydrator method. When the flocculating sludge in which the polymer flocculant is injected onto the filter cloth is supplied, the gap water between the flocs is dehydrated by gravity at the gravity dewatering part, and the transferred sludge is dewatered by the compression of the upper and lower filter cloths. do. Dewatered sludge is stripped from the filter cloth by a scraper. The filter cloth from which the dewatered sludge has been removed is continuously washed by pressure water to prevent clogging of the net and then moved back to the gravity dewatering part. This filtration process is performed continuously. However, the improvement of the water content of the desired dewatered sludge is not achieved by the improvement of the dewatering device alone.

Therefore, there is an urgent need for a method capable of reducing the water content of dewatered sludge. For this reason, the present inventors have improved the total solid concentration (0.4-0.6% → 3-7%) of the mixed sludge, reducing the dewatered sludge moisture content from 83% to 74%, resulting in the reduction of dewatered sludge production and treatment cost. The present invention has been developed to contribute to wastewater treatment management.

1. Utility registration number 20-0313648, Filter cloth cleaning device for belt press type dehydrator. 2. Utility registration No. 20-0286688, Filter cloth cleaning device for belt press type dehydrator.

An object of the present invention was developed in view of the above-mentioned problems, to improve the sludge dewatering rate according to the concentration of the total solids of the mixed sludge, to reduce the load in the main water treatment process due to achieving the concentration decrease in the desorption filtrate, Reduction of sludge treatment costs due to the reduced amount of dewatered sludge, reduction in the use of coagulant supplements, reduction of power consumption due to shortening of dehydrator operation time, and dewatering operation with stable water content by eliminating clogging of dewatering filter cloth The present invention provides a dewatered sludge moisture content reducing apparatus and a method for reducing dewatered sludge moisture content.

In order to achieve the above object, the dehydration sludge moisture content reduction device, in which the high solids concentration in the single mixed sludge storage tank of the present invention and the high pressure washing water are supplied to the nozzle to the upper and lower filter cloths for dewatering, is the first of the wastewater treatment facilities. Alternatively, the sludge generated from the final sedimentation basin can be repeatedly executed in the order of stirring, sedimentation, solid-liquid separation, and discharge of supernatant water until the total solid concentration is 3-7% in the mixed sludge reservoir. Solids concentration improving device of the mixed sludge; The mixture sludge is placed adjacent to the concentration improving device of the mixed sludge solids, and the flocculant is mixed using the mixed sludge and the coagulant having improved solids concentration discharged from the apparatus, and the input rate of the auxiliary coagulant is mixed. A mixer for mixing only the amount reduced by the rate of improvement of the solid concentration of the sludge; A dehydrator configured to compress the flocked blood dehydrated product discharged from the mixer between the upper and lower follicles of the gravity dewatering unit and move between the rollers to dehydrate the sheared output; And a symbol water storage tank for storing the symbol water discharged from the solids concentration improving device of the mixed sludge, and spraying the upper and lower filter cloths with high pressure from the symbol water storage tank at high pressure during the dehydration operation by the dehydrator. And a high pressure cleaning device comprising a high pressure pump and a high pressure nozzle to obtain a stable water content sludge by cleaning the remaining sludge present in the pores of the filter cloth.

In addition, in order to achieve the above object, the total solid concentration improving device of the mixed sludge, a single mixed sludge storage tank for temporarily storing the mixed sludge generated from the initial or final sedimentation basin of the waste water treatment plant; An agitator installed at the center of the single mixed sludge storage tank to continuously stir the sludge (raw sludge or surplus sludge) introduced into the mixed sludge storage tank to prevent precipitation; A symbol pump for discharging the water for discharging only the symbol water separated from the total solids in the single mixed sludge storage tank after the stirring operation toward the symbol water storage tank; A solids supply pump installed to contact the inside of the single mixed sludge storage tank and the mixer, and suctioning the sludge total solids settled in the single mixed sludge storage tank in the stopped state of the stirring operation and the supernatant discharge operation and pumping them to the mixer. Characterized in that consisting of.

In order to achieve the above object, the method of improving the total solids concentration in the single mixed sludge storage tank of the present invention and the dewatered sludge moisture content reduction method for supplying the high pressure washing water to the nozzles to the upper and lower filter cloths for dewatering are the first of the wastewater treatment facilities. Or the total amount of mixed sludge to be repeatedly executed in the order of stirring, sedimentation, solid-liquid separation, and discharge of supernatant water until the total solid concentration reaches 3-7%. Solids concentration improvement step; Mixing the flocculant with the flocculant using an auxiliary flocculant to the sludge solids having improved total solids concentration transferred from the above step, but adding the auxiliary flocculant by mixing only the amount reduced by the improvement of the solids concentration; A dehydration step of dehydrating water in the dehydrated material through the meshes of the filter cloth by supplying and pressurizing the flocked blood dehydrated product discharged from the mixing step between the upper and lower compression filter cloths; And a symbol water storage tank for storing the symbol water discharged from the total solid concentration improvement step of the mixed sludge, and spraying the upper and lower filter cloths with high pressure from the symbol water storage tank at high pressure during the dehydration operation by the dehydration step. And a high pressure scrubbing step of obtaining a dehydrated sludge of stable water content by washing the remaining sludge present in the pores of the filter cloth.

In addition, the method for reducing the dewatered sludge moisture content of the present invention for achieving the above object is to accommodate the step of improving the total solid concentration of the mixed sludge, temporarily storing the mixed sludge generated from the first or final sedimentation basin of the wastewater treatment plant. A stirring step of rotating in the center of the mixed sludge storage tank to prevent precipitation by stirring the mixed sludge flowing into the single mixed sludge storage tank; A symbol water discharge step of pumping the symbol water separated from the solids in the single mixed sludge storage tank after the stirring operation to the symbol water storage tank; And a solids supply step of sucking the sludge total solids precipitated in the single mixed sludge storage tank and supplying them toward the mixing step.

According to the present invention, the effect of improving the concentration of the total solids of the mixed sludge to improve the moisture content of the dewatered sludge has the effect of reducing the concentration in the desorption filtrate and reducing the load in the main water treatment process, and also the auxiliary flocculant. It has the effect of reducing the amount of waste consumed by improving the concentration of solids, and also has the effect of reducing the treatment cost of sludge by reducing the amount of dewatered sludge, and reducing the power consumption due to the shortening of dehydrator operation time and the eye of filter cloth. There is a production effect of dewatered sludge having a stable water content due to the clogging removal.

1 is a block diagram schematically illustrating a dehydration sludge moisture content reducing apparatus for improving the total solid concentration in a single mixed sludge storage tank according to the present invention and supplying a high pressure washing water to a nozzle to upper and lower filter cloths for dewatering.
2 is a view schematically showing a state in which the filter cloth is cleanly cleaned by the high pressure washing water supply nozzle,
3 is an enlarged view of a state in which the dewatered sludge attached to the actual filter cloth is released from the flocculated sludge by the high pressure washing water supply nozzle, and is released.
4 is a view showing a state in which the filter cloth is washed with a conventional washing water (pressure 3-5 kg / cm 2).

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, an improved dehydration sludge moisture content reducing apparatus and a method for reducing the total solid concentration in a single mixed sludge storage tank according to the present invention and high pressure washing water are supplied to a nozzle to upper and lower filter cloths for dewatering according to the present invention. It will be described in detail.

1 is an overall configuration diagram schematically illustrating a dehydration sludge moisture content reduction device for supplying a high pressure washing water to a nozzle in an upper and lower filter cloth for dewatering the total solids in a single mixed sludge storage tank according to the present invention.

As shown in the drawing, if the configuration for the dewatered sludge moisture content reduction device 100 according to the present invention is roughly divided, the storage device 110 for improving the total solid concentration of the mixed sludge, the mixer (Mixer) 120, It consists of a high pressure washing water supply device 140 consisting of a dehydrator 130 and the washing water supply nozzles (142a, 142b).

The total solid concentration improving device 110 of the single mixed sludge storage tank, the total solid concentration in the single mixed sludge storage tank prior to transferring the waste sludge generated and introduced from the first or final sedimentation basin of the wastewater treatment plant to the dehydrator 130. (TS) is the core configuration of the present invention, which is used as the washing water to prevent clogging of the filter cloth by storing the discharged to the outside of the symbol water produced in the process of sedimentation and mixed sludge.

That is, the total solid concentration improving device 110 of the single mixed sludge is provided with a mixed sludge total solid storage tank 111 in the form of a tank. The mixed sludge flows into the single mixed storage tank 111 through the mixed sludge inlet port 115 provided in the storage tank 111. When the mixed sludge flows into the storage tank 111, the operation of the stirrer 112 provided in the center of the storage tank 110 starts. Operation of the stirrer 112 prevents precipitation of the mixed sludge. In addition, the stirring operation of the stirrer 112 is a factor to improve the concentration of the total solids in the single-mix storage tank (111). The operation of the stirrer 112 is performed by inputting an operation signal from the control panel 200. When it is confirmed that the inflow of the mixed sludge reaches the inside of the single mixing reservoir 111 to reach a high level, the sludge suction pump installed at the mixing sludge inlet 115 side as well as the operation of the stirrer 112 from the control panel 200 ( Block P1) to prevent mixing sludge from entering.

When the operation of the stirrer 112 is stopped and the predetermined time (approximately 5 to 10 minutes) has elapsed, the mixed sludge which has become turbid due to the agitation caused by the operation of the stirrer 112 is solid-liquid separated. Solids are precipitated toward the lower side of the mixed storage tank 111, while a clear symbolic water is formed on the upper side. The symbol water generated in this way is discharged into the symbol water storage tank 118 disposed adjacent to the storage tank 111 by the symbol water discharge motor pump 117 installed to be moved up and down in the storage tank 111 to be stored. On or off operation of the super water discharge motor pump 117 can be performed directly by confirmation of an operator, but can be automatically executed by the control panel 200. That is, when no water level detection signal of the symbol water is input to the control panel 200 from the water level detection sensor 114 installed in the single mixing reservoir 110, the control panel 200 stops the operation of the symbol pump discharge motor pump 117. Stop. On the contrary, when the water level detection of the symbol water is confirmed from the water level detection sensor 114 and input to the control panel 200, the control panel 200 controls the motor pump 117 for discharge of the symbol water to operate. Reference numeral 119 denotes a water level detection sensor that detects whether or not the symbol water reservoir 118 is at a water level.

The reason for discharging the symbolic water after the solid-liquid separation in the single-mix storage tank 110 in the present invention is to concentrate the concentration (TS) of the total solids in the storage tank 110 to 3 to 7% to increase the water content of the solids from 93 to 93. In order to maintain 97%, a series of operations such as stirring the precipitated mixed sludge flowing into the single mixed storage tank (110), discharge the symbol water, etc., the concentration (TS) of the total solids in the single mixed storage tank (110) is 3 ~ The test is repeated until 7% is achieved. Whether the concentration (TS) of the total solids in the single-mix storage tank 110 is in the range of 3 to 7% is confirmed from the solids concentration measuring instrument 113 installed to be exposed to the outside on the upper right of the single-mix storage tank (110). do. When the solids concentration in the single-mix storage tank 110 is measured in the range of 3 to 7% based on the present invention from the solids concentration measuring instrument 113 and input to the control panel 200, the control panel 200 is a solids supply pump. In addition to P2, the high pressure pump P3, which is the high pressure washing device 140, and the washing water supply nozzles 142a and 142b are controlled to be operated.

Operation of the total solids supply pump P2 feeds the total solids to the mixer 120 installed adjacent to the single mixed storage tank 110. In the mixer 120, a pre-prepared flocculent aid (for example, Polymer: 0.2% dissolution rate) is added to mix with the total solids conveyed. The reason for adding the coagulant adjuvant is to agglomerate the total solids containing water in the form of floc. In the present invention, the mixed sludge flowing into the single mixed storage tank 110 is stirred → precipitation → solid-liquid separation → symbolic water. The total solids concentration (TS) is maintained at 3 to 7% through a series of operations such as discharge, maintaining 93 to 97% of the water content of solids, thereby maintaining the existing water content of 99.6 to 99.8%. Flocking of the solids can be easily achieved even if the amount of the coagulant added to the floc is lower than that of the flocculant. In addition, the decrease in the water content due to the mixing of the flocculant becomes a major factor for shortening the dehydration work time described later. do. Moisture generated from the solids in the agglomeration process of the mixer 120 is discharged to the collecting tank 150 of the dehydrator 130 through the drain valve 122 and is reprocessed. The detailed configuration of the mixer 120 is omitted because it is a general technique.

Solids aggregated in a floc form in the mixer 120, that is, the dehydrated material M are transferred to the belt press type dehydrator 130 and the dehydration process is performed. The dehydrator 130 is provided with two filter cloths 131a and 131b installed up and down against the pressure rollers 132a and 132b in the form of an endless belt, and are continuously rotated while being supplied between the filter cloths 131a and 131b. The dehydration material (M) is compressed to dehydrate the water of the dehydration material (M), and the upper and lower parts of the filter cloths (131a and 131b) are used to clean the water supplied from the high pressure cleaning supply pump (P3). 20-25 kg / cm 2 of high pressure washing water is sprayed from 142a and 142b to remove dehydrated material (flours of floc particles) attached to the filter cloth.

The present invention is to reduce the dehydration sludge during the dehydration operation by reducing the water content through the pre-treatment operation (stirring, sedimentation, solid-liquid separation, supernatant discharge, etc.) for the dehydrated material (M) to be provided to the dehydrator 130 and dehydration The reduction of sludge is caused by the floc particles attached to the filter cloths 131a and 131b by the high pressure washing water supply nozzles 142a and 142b to prevent the clogging of numerous pores of the upper and lower filter cloths 131a and 131b. Peel off cleanly. Since the washing water of the present invention is sprayed onto the filter cloth at a high pressure of 20-25 kg / cm 2, the floc particles (waste) can be peeled off more cleanly without blocking the pores, thereby improving the porosity of the filter cloth, thereby providing a stable water content at all times. It is possible to produce the final dewatered sludge (S) having, as a result, the amount of the final dewatered sludge is reduced.

This fact can be confirmed from Figures 2 to 4, Figure 2 is a schematic view showing a state in which the filter cloth is cleanly cleaned by the high pressure washing water supply nozzle, Figure 3 is a high pressure washing water supply of the actual filter cloth of the present invention 4 is a view showing an enlarged state in which the floc particles are separated and escaped by the nozzle, whereas FIG. 4 is a view illustrating a state in which a conventional filter cloth is washed with washing water (pressure 3 to 5 kg / cm 2). Peeled from the pores of the filter cloth, it does not escape and shows a state that remains as it is.

The dehydration filtrate discharged from the dehydrator 130 is collected by the collecting container 150 installed in the lower part of the dehydrator 130 and then sent to the main water treatment process (sedimentation basin or the first sedimentation basin) through the bioreactor to the bottom of the final sedimentation basin It is deposited and flows back into the single mixed storage tank 110. Although the dewatering filtrate generated from the dehydrator 130 of the present invention also causes the concentration to be reduced in the filtrate, the desorption filtrate is returned to the main water treatment process. Alternatively, the load of the main water treatment process is reduced as the concentration of the desorption filtrate is reduced. These facts will be more reliably supported by the following test examples.

<Test Example>

According to the present invention, a simple experimental device was installed in the dewatering facility in the Pungtaek sewage treatment plant (oxidation sphere method) in Pyeongtaek-si, Gyeonggi-do, and as a result, there was a change in the operating factors of reducing the dewatered sludge moisture content compared to the conventional (Table 1). It was confirmed from Table 2 (Table 2).

Pre-experimental results Item
Order Mountain fire Sludge reservoir DO
(/ L) MLSS
(/ L) MLVSS
(/ L) SV _30
(%) MLSS
(mg / L) Sludge
Moisture content
(%) TS
(%) Dewatering Sludge
Moisture content (%) Primary 1.50 2,880 1,410 29 5,000 99.8 0.2 83.5 Secondary 1.52 3,210 1,570 29 5,500 99.7 0.3 85.0 Third 1.80 2,710 1,330 26 6,000 99.8 0.2 83.5 Fourth 1.50 3,300 1,620 30 6,500 99.6 0.4 82.9 5th 1.72 2,790 1,370 28 7,000 99.7 0.3 81.8 6th 1.64 3,110 1,420 29 7,500 99.6 0.4 82.1 Seventh 1.71 2,980 1,560 29 8,000 99.8 0.2 83.7 Average 1.63 2,997 1,468 28.57 6,500 99.71 0.29 83.21

Post Test Results Item
Order Acidification tool (/ L) Sludge reservoir DO
(/ L) MLSS
(/ L) MLVSS
(/ L) SV _30
(%) MLSS
(mg / L) Sludge
Moisture content
(%) TS
(%) Dewatering Sludge
Moisture content (%) Test period
(day) Primary 1.50 2,880 1,410 29 5,000 99.8 3.8 78 5 Secondary 1.52 3,210 1,570 29 5,500 99.7 7.2 72 5 Third 1.80 2,710 1,330 26 6,000 99.8 6.3 73 8 Fourth 1.50 3,300 1,620 30 6,500 99.6 4.8 75 8 5th 1.72 2,790 1,370 28 7,000 99.7 5.8 73 10 6th 1.64 3,110 1,420 29 7,500 99.6 6.8 72 12 Seventh 1.71 2,980 1,560 29 8,000 99.8 7.5 74 12 Average 1.63 2,997 1,468 28.57 6,500 99.71 6.03 73.86 60

 As can be seen from Tables 1 and 2, when looking at the total solid concentration (TS concentration) in the sludge storage tank of the prior art and the present invention, the conventional Table 1 has an average water content of 99.71% of the sludge flowing into the sludge storage tank, The average solid concentration (TS concentration) was 0.29% and the flocculation sludge with the addition of flocculent aid (Polymer 0.2%) was fed to the dehydrator so that the gap water between the condensate was dehydrated by gravity. It shows the moisture content of the final dewatered sludge when dehydrated by the filter cloth compression of the dehydrator by being moved to the dehydrator.

On the other hand, Table 2 shows that the water content of the sludge flowing into the single mixed sludge storage tank of the present invention is the same condition as before the experiment, but after filling the inflow sludge into the storage tank, blocking the inflow sludge and stopping the agitation so that the solid-liquid separation by gravity As a result, the total solid concentration (TS concentration) was 6% on average, with only the solids settled at the bottom of the reservoir and the discharge of the symbolic water to the outside until the TS concentration reached 3 ~ 7%. Could be seen,

Sludge
inflow Sedimentation Symbol
Discharge Sludge
inflow Sedimentation Symbol
Discharge TS
(%) Dehydrator agitator
Dong agitator
stop Submersible pump
Dong agitator
Dong agitator
stop Submersible pump
Dong 3 to 7 behavior

In addition, the dehydrated sludge moisture content was found to be 73.86% on average and the dehydrated sludge moisture content was 11.24%.

As a result, the flocculation sludge is not leaked to the side of the filter cloth when it comes into close contact with the dewatering filter cloth.Therefore, the consumption of the coagulant aid (Polymer) is reduced and the concentration of the desorption filtrate generated after dehydration is reduced. It was confirmed to reduce the load on the water treatment process.

Table 4 shows a comparison between the operating state of the present invention and the conventional dehydrator.

Item unit Improvement After improvement Remarks  TS concentration % 0.4 3 to 7  Sludge Reservoir  Function rate % 83.21 73.86  11.24% reduction Dewatering Sludge
Generation amount m ³ / day 1.48 1.32 * 0.16m ³ weight loss  Dehydrator operation hr / ㎥ 2/60 0.36 / 10.9 * TS: 0.4% 3 ~ 7% Remarks Treatment plant capacity: 12,000 tons / day.
Influent quality concentration (average): BOD 196.8mg / L. SS 216.3mg / L

   The present invention can be indirectly confirmed from Table 4 above that the total solids concentration of the mixed sludge (TS concentration), the dewatered sludge moisture content, the operation of the dehydrator, and the like are superior to the conventional ones.

The present invention, by improving the water content of the dewatering sludge, reducing the load of the main water treatment process, reducing the consumption of auxiliary coagulant, reducing the treatment cost of the sludge by reducing the amount of dewatered sludge, reduced power consumption due to shortening the dehydrator operating time In addition, there is industrial utility such as producing dewatered sludge having a stable water content by removing clogging the pores of the filter cloth.

100: dewatered sludge moisture content reduction device
110: solids concentration improving device of mixed sludge
117: symbolic water discharge device
120: mixer
130: dehydrator
140: high pressure washing water supply device
142a, 142b: upper and lower filter cloth cleaning water supply nozzle

Claims (4)

Disposal of sludge from the initial or final sedimentation basin of the wastewater treatment plant, and agitation, sedimentation, solid-liquid separation, and supernatant are discharged in a single mixed sludge algae until the total solid concentration is 3-7%. A solids concentration improving device for mixed sludge, which can be repeatedly executed in the order of;
It is installed in a position adjacent to the concentration improvement device of the mixed sludge solids and flocculated by mixing the solids and the coagulant discharged from this device, and the amount of the auxiliary coagulant is reduced as the concentration of the solids is improved. A mixer for mixing by putting only;
A dehydrator for dehydrating the water of the dehydrated object through the pores of the filter cloth by supplying and pressurizing the flocked blood dehydrated product discharged from the mixer between the upper and lower filter cloths which are rotated in contact with each other by a pressure roller; And
A symbol water storage tank is provided for storing the symbol water discharged from the solids concentration improving device of the mixed sludge, and the pores of the upper and lower filter cloths are sprayed by the nozzle at high pressure from the symbol water reservoir to the upper and lower filter cloths during the dehydration operation by the dehydrator. High pressure cleaning of the total solids concentration in the single mixed sludge storage tank and the upper and lower filter cloths for dewatering, including a high pressure pump and a high pressure cleaning device comprising a high pressure nozzle and a high pressure pump to obtain a stable water content dewatered sludge by cleaning the remaining sludge in the tank. A dewatering sludge moisture content reduction device that allows water to be supplied to a nozzle. The apparatus of claim 1, wherein the solids concentration improving device of the mixed sludge comprises: a single mixed sludge storage tank for temporarily storing the mixed sludge generated from the first or the final sedimentation basin of the wastewater treatment plant;
A stirrer installed at a center in the single mixed sludge storage tank to stir the mixed sludge flowing into the mixed sludge storage tank to prevent precipitation;
A motor pump for discharging the symbol water to be movable in the mixed sludge storage tank and discharging only the symbol water separated from the solids in the mixed sludge storage tank after the stirring operation by the stirrer toward the symbol water storage tank; And
The single-mixed sludge storage tank is installed in contact with the mixer and the solids supply pump for suctioning the sludge solids settled in the mixed sludge storage tank in the stopped state of the stirring operation and the supernatant water discharge operation and transported to the mixer. An apparatus for reducing dehydration sludge moisture content, wherein the high pressure washing water is supplied to a nozzle to increase total solids concentration in a single mixed sludge storage tank and upper and lower filter cloths for dehydration. The waste sludge generated from the initial or final sedimentation basin of the wastewater treatment plant is agitated, precipitated, solid-liquid separated, and discharged from the supernatant until the total solid concentration is 3-7% in a single mixed sludge reservoir. Improving the solids concentration in the single mixed sludge reservoir for repeated execution in sequence;
The flocculant is mixed with the coagulant with improved solids concentration conveyed from the step, and mixed to floc, but the feed rate of the coagulant is mixed by adding only the amount reduced by the improvement rate of the solids concentration of the mixed sludge. step;
A dehydration step of dehydrating water in the dehydrated material through pores (mesh) of the filter cloth by supplying and pressurizing the flocked blood dehydrated product discharged from the mixing step between upper and lower filter cloths; And
And a symbol water storage tank for storing symbol water discharged from the solids concentration improvement step of the waste sludge, and nozzles for washing water at high pressure from the symbol water storage tank to the upper and lower filter cloths during the dehydration operation by the dehydration step. Into the upper and lower filter cloth for total solid concentration and dewatering in a single mixed sludge storage tank, comprising a high pressure washing step of spraying on to obtain dehydrated sludge with a stable moisture content by cleaning the remaining sludge in the pores of the upper and lower filter cloth. A method of reducing the water content of dewatered sludge in which high pressure washing water is supplied to a nozzle. According to claim 3, The solids concentration improvement step of the mixed sludge is installed to be rotated in the center in the single-mixed sludge storage tank to temporarily receive the waste sludge generated from the initial or final sedimentation basin of the waste water treatment plant, the mixing A stirring step for agitating the waste sludge flowing into the sludge storage tank until the predetermined height in the single mixed sludge storage tank is reached to prevent solids from settling;
A symbol water discharge step of pumping and discharging only the symbol water separated from the solid matter in the single mixed sludge storage tank to the symbol water storage tank after the stirring operation; And
Improving the total solids concentration in the single-mixed sludge storage tank, characterized in that the sludge solids precipitated in the single-mixed sludge storage tank in the stopped state of the stirring operation and the supernatant discharge operation is carried out and pumped toward the mixing step. A method of reducing the moisture content of dewatered sludge in which high pressure washing water is supplied to a nozzle to an upper and a lower filter cloth for dewatering.

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