Filter plate set and sludge filter pressing method for realizing sludge deep dewatering

Abstract

The present application relates to the field of sludge dewatering treatment, and particularly relates to a filter plate group and a sludge filter pressing method for realizing deep dewatering of sludge. The height of the sludge cavity of the filter plate group is 23-28 mm; filter screens are arranged between the box plate and the filter cloth and between the membrane plate and the filter cloth. The sectional area of the sludge distribution port is calculated according to the sludge flow and the flow rate of the sludge injection port; the quantitative sludge injection amount M required for the filter pressing sludge cake is calculated according to the incoming sludge moisture content, and the quantitative sludge injection is adopted. The support force of the filter screen effectively ensures the smoothness of the water conveying channel, and ensures that the filter liquid is quickly discharged after filter pressing; the sectional area of the sludge distribution port is calculated to ensure that the sludge is sprayed out of the sludge outlet port of the cloth clamp at a certain speed, rather than overflowing; the total sludge injection amount is quantitatively injected, the required sludge injection amount is calculated according to the sludge cake thickness and the change of the incoming sludge moisture content, and the problems of large sludge injection amount, long sludge injection time, thick sludge cake and high moisture content in the prior art are avoided.

Description

Technical Field

[0001] This invention relates to sludge dewatering equipment, and more particularly to a filter plate assembly and a sludge dewatering method for achieving deep sludge dewatering. Background Technology

[0002] Currently, diaphragm plate and frame filter presses are widely used in sludge treatment processes at wastewater treatment plants. The diaphragm plate and frame filter plate assembly is one of the main filtration components of the filter press. However, to improve processing capacity, existing diaphragm plate and frame filter presses have a large filter chamber height for sludge, resulting in a large single sludge injection volume and a very thick sludge cake after filtration, typically exceeding 30mm. Due to the thickness of the sludge cake, a crust forms on the outer surface, while a "loose core" appears in the center. Water in the center cannot easily penetrate the outer crust, and even increasing the filtration pressure and time cannot separate the water from the center. Long filtration times lead to high moisture content in the sludge cake. Furthermore, existing diaphragm plate and frame filter plate assemblies experience poor effluent flow during filtration. This contributes to a higher moisture content in the sludge cake. Furthermore, for filter plate assemblies of the same specifications, the cross-sectional area of ​​the sludge distribution port of the cloth clamp is usually proportional to the size of the sludge chamber of the filter plate assembly, regardless of the number of filter plate assemblies. However, in actual production, a larger number of filter plate assemblies results in a relatively larger initial sludge injection flow rate, while a smaller number of filter plate assemblies results in a relatively smaller initial sludge injection flow rate. With a fixed cross-sectional area of ​​the cloth clamp's sludge distribution port, this leads to significant pressure differences at the inlet positions of each sludge chamber, resulting in uneven sludge cake thickness among the various filter plate assemblies. Due to the diaphragm travel constraint of the diaphragm plate and frame filter plate assembly, chambers with less sludge will experience diaphragm damage due to exceeding the travel limit, while thicker sludge cakes have a "loose core" with a very high moisture content. Summary of the Invention

[0003] Given the problems of existing diaphragm plate and frame filter presses, such as excessively thick sludge cake leading to long filtration times and high sludge cake moisture content, this invention provides a filter plate assembly and sludge filtration method for achieving deep sludge dewatering: reducing the sludge cavity height of the diaphragm plate and frame filter assembly, thus reducing the sludge cake thickness and the percentage of the "soft core" portion, while ensuring that the moisture content of the "soft core" is lower than that of the "soft core" in thicker sludge cakes, effectively reducing the sludge cake moisture content while ensuring that the diaphragm travel does not exceed the safe operating range; and adding a supportive and flexible material between the filter cloth and the filter plate. The resilient filter screen effectively ensures smooth water flow and rapid discharge of the filtrate. The cross-sectional area of ​​the sludge outlet holes in the filter plate assembly is calculated to ensure that the sludge is ejected from the outlet holes at a certain speed, rather than overflowing. The total sludge injection volume is quantitatively determined based on the thickness of the filter cake and the moisture content of the incoming sludge. This avoids problems such as excessive sludge injection volume, long injection time, and thick, high-moisture filter cakes, ensuring both low moisture content in the filter cake and unaffected equipment processing capacity.

[0004] The technical solution of this invention is: a filter plate assembly for deep dewatering of sludge, comprising a box plate assembly, a membrane plate assembly, a main cloth clamp, a secondary cloth clamp, a sludge separating port, and a sludge chamber. The box plate assembly and the membrane plate assembly are arranged side by side with intervals, and the space between the box plate assembly and the membrane plate assembly forms the sludge chamber. The end face of the main cloth clamp of the box plate assembly and the end face of the secondary cloth clamp of the membrane plate assembly are in close contact, and a sludge separating port is formed between the groove on the end face of the main cloth clamp of the box plate assembly and the end face of the secondary cloth clamp of the membrane plate assembly. The height of the sludge chamber is 23~28mm. A sealing ring and a filter screen I are respectively arranged on both sides of the box plate in the middle of the box plate assembly, and the outer ring size of the filter screen I is smaller than the inner ring size of the sealing ring. Filter cloth I is arranged on both sides of the box plate, and the filter cloth I covers the sealing ring and the filter screen I. A sludge channel I is arranged at the center of the box plate, and the main cloth clamp and the secondary cloth clamp are respectively arranged at both ends of the sludge channel I and fix the filter screen I and the filter cloth I.

[0005] Filter screens II are respectively provided on both sides of the membrane plate in the middle of the membrane plate assembly, and filter cloths II are respectively provided on the outer sides of the two filter screens II, covering the filter screens II; sludge channel II is provided in the center of the membrane plate, and main cloth clamps and auxiliary cloth clamps are respectively provided at both ends of the sludge channel II and press the filter screens II and filter cloths II tightly.

[0006] In the above technical solution, the cross-sectional area of ​​the mud outlet 4 is calculated according to the formula S=q0 / v / 3600:

[0007] Where: S - cross-sectional area of ​​the sludge distribution port of the cloth clamp, the sum of the cross-sectional areas of several grooves; q0 - sludge flow rate in the early stage of sludge injection when the number of sludge chambers is 1, unit: m³ / h, the value is 9.5~12.5 times the volume of a single sludge chamber, unit: m³; v - flow velocity of the sludge distribution port of the cloth clamp, unit: m / s.

[0008] A sludge dewatering method for achieving deep sludge dewatering includes two stages: sludge injection and filtration.

[0009] Mud injection stage I: Based on the moisture content of the incoming mud, use the formula "M=G" 干 The required quantitative sludge injection volume M for filter cake is calculated using " / (1-W%)+dosage".

[0010] Where: M - total volume of mud injection in a single batch, m³; G 干 - The amount of sludge on a dry basis, i.e., the actual production capacity of the filter press during production, in units of t / batch; W% - the moisture content of the incoming sludge;

[0011] Stage II of mud injection: Based on the quantitative mud injection volume M calculated in Stage I of mud injection, the entire mud injection process is carried out according to the following steps:

[0012] Step 1: Calculate the sludge flow rate Q0 at the initial stage of sludge injection according to the formula Q0 = K × N × q0, where: Q0 is the total sludge flow rate at the initial stage of sludge injection, unit: m³ / h; N is the number of sludge chambers, unit: piece; K is the calibration coefficient; q0 is the sludge flow rate at the initial stage of sludge injection when the number of sludge chambers is 1, unit: m³ / h.

[0013] Step 2: Sludge injection: Step sequence 1, the sludge flow rate Q0 at the initial stage of sludge injection, the set pressure is P0. When the sludge injection duration reaches T0, when the cumulative flow rate M0 of the flowmeter < M, enter step sequence 2. When M0 = M, the sludge injection pump stops sludge injection; set the sludge flow rate Q1 at the initial stage of sludge injection, the set pressure is P1. When the sludge injection duration reaches T1, when the cumulative flow rate M1 of the flowmeter < M, enter step sequence 3. When M1 = M, the sludge injection pump stops sludge injection, and so on. When the set sludge injection pump flow rate is Q n-1 When, if the sludge injection duration is less than T n-1 seconds, but the sludge injection pressure reaches P n-1 When, through program control, finely adjust the sludge injection flow rate of the sludge injection pump. When the sludge injection duration reaches T n-1 , and M n-1 < M, enter the next step sequence; if the sludge injection duration reaches T n-1 seconds, the sludge injection pressure is less than P <{0000009}>, M n-1 < M and enter the next step sequence; if M n-1 = M during this process, at the moment when M n-1 = M, the sludge injection pump stops sludge injection.

[0014] Where: Q1, Q2, Q n-1 are the sludge flow rates at different stages, and n > 1.

[0015] Filter pressing stage: After the sludge injection ends, inject pressing water into the pressing water chamber of the diaphragm filter plate group to squeeze the sludge in the sludge chamber until the filter pressing ends.

[0016] The beneficial effects of the present invention are:

[0017] Add a filter screen to prevent partial blockage of the hydrophobic channel during the sludge filter pressing process, effectively improve the smoothness of the hydrophobic channel during the sludge injection and filter pressing processes, and help reduce the moisture content of the mud cake.

[0018] The sludge at the inlet of the sludge injection hole 4 has a certain pressure and the pressure difference at each sludge injection hole 4 is controllable, so that the sludge jets out at a certain speed, effectively solving the problem of uneven mud cake thickness in each sludge chamber.

[0019] During sludge dewatering, crusting occurs on the filter cloth on both sides of the sludge chamber, preventing the water in the sludge at the center of the chamber from being quickly dewatered and separated. Traditional diaphragm plate and frame filter plate assemblies result in a large sludge chamber height and a thick sludge cake, typically over 30mm. After dewatering, the sludge cake has a "loose core," leading to a high water content. This invention reduces the height of the sludge chamber while maintaining the same filtration area of ​​the filter cloth, enabling rapid sludge injection. At the same time, the thickness of the formed sludge cake is controlled to around 15mm, significantly reducing the water content and proportion of the "loose core," effectively lowering the water content of the sludge cake.

[0020] Quantitative mud injection is adopted according to the sludge moisture content to control the thickness of the mud cake, avoid problems such as excessively thick mud cake or uneven mud cake thickness, and prevent damage to the diaphragm plate frame template caused by mud cake that is too thin in some chambers.

[0021] The production cycle is short, ranging from 1.5 hours to 2.5 hours depending on the type of sludge. While meeting the processing capacity, it results in a lower moisture content and thinner sludge cake, making it easier to unload. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 yes Figure 1 A magnified view of part A in the image;

[0024] Figure 3 This is a schematic diagram of the box panel assembly structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the template component structure of the present invention;

[0026] Figure 5 yes Figure 3 A magnified view of part B in the image;

[0027] Figure 6 yes Figure 4 A magnified view of part A in the image;

[0028] Figure 7 This is a front view of the secondary fabric clamp of the present invention;

[0029] Figure 8 This is a cross-sectional view of the auxiliary fabric clamp of the present invention;

[0030] Figure 9 This is a front view of the main fabric clamp of the present invention;

[0031] Figure 10 This is a cross-sectional view of the main fabric clamp of the present invention.

[0032] The components are as follows: 1. Box plate assembly; 1-1. Box plate; 1-1-1. Sealing ring I; 1-1-2. Box plate base plate; 1-2. Sealing ring; 1-3. Filter cloth I; 1-4. Filter screen I; 1-5. Sludge channel I; 2. Membrane plate assembly; 2-1. Membrane plate; 2-1-1. Sealing ring II; 2-1-2. Diaphragm; 2-3. Filter cloth I; 2-4. Filter screen II; 2-5. Sludge channel II; 3-1. Main cloth clamp; 3-1-1. Groove; 3-2. Secondary cloth clamp; 4. Sludge outlet; 5. Sludge chamber. Detailed Implementation

[0033] like Figures 1 to 10 As shown, a filter plate assembly for deep dewatering of sludge includes a box plate assembly 1, a membrane plate assembly 2, a main cloth clamp 3-1, a secondary cloth clamp 3-2, a sludge distribution port 4, and a sludge chamber 5.

[0034] Several grooves 3-1-1 are provided on the end face of the main cloth clamp 3-1 of the box plate assembly 1; sealing rings 1-2 are provided on both sides of the sealing ring 1-1-1 of the box plate 1-1, and filter screens I1-4 are provided on both sides of the box plate 1-1. The outer ring size of the filter screen I1-4 is smaller than the inner ring size of the sealing ring 1-2; the sealing ring 1-2 and the filter screen I1-4 are covered with filter cloth I1-3; the sludge channel I1-5 is set at the center of the box plate 1-1, and the main cloth clamp 3-1 and the auxiliary cloth clamp 3-2 are installed at both ends of the sludge channel I1-5, respectively. The main cloth clamp 3-1 and the auxiliary cloth clamp 3-2 fix the filter screen I1-4 and the filter cloth I1-3 at the corresponding positions, respectively.

[0035] Filter screens II2-4 are set on both sides of membrane plate 2-1 in the middle of membrane plate assembly 2, and the outer sides of the two filter screens II2-4 are covered with filter cloth II2-3; sludge channel II2-5 is set in the center of membrane plate 2-1, and main cloth clamp 3-1 and auxiliary cloth clamp 3-2 are respectively installed at both ends of sludge channel II2-5 and press and fix the filter screens II2-4 and filter cloth II2-3 at the corresponding positions;

[0036] Box plate assembly 1 and membrane plate assembly 2 are hung side by side and spaced apart on the crossbeam of the filter press. The space between box plate assembly 1 and membrane plate assembly 2 forms sludge chamber 5. The height of the traditional sludge chamber is reduced to about 25mm in the following way to ensure that the thickness of the sludge produced by the filter press is between 8mm and 15mm. The specific method is as follows: increase the thickness of the box plate base plate 1-1-2 of box plate 1-1 so that the height difference between the sealing surface of the sealing ring I 1-1-1 of box plate 1-1 and the surface of the box plate base plate I 1-1-2 is L1=12mm; reduce the thickness of the sealing ring II 2-1-1 of membrane plate 2 so that the height difference between the sealing surface of the sealing ring II 2-1-1 and the surface of the diaphragm 2-1-2 is L2=3mm. At this time, the height of the sludge chamber is about 25mm.

[0037] The end face of the main cloth clamp 3-1 of the box plate assembly 1 and the end face of the auxiliary cloth clamp 3-2 of the membrane plate assembly 2 are in close contact. Several mud-dividing ports 4 are formed between several grooves 3-1-1 on the end face of the main cloth clamp 3-1 of the box plate assembly 1 and the end face of the auxiliary cloth clamp 3-2 of the membrane plate assembly 2.

[0038] Example: Taking the sludge injection process of a filter press equipped with 120 filter chambers measuring 1820×1820×25mm as an example when treating municipal sludge from a sludge treatment plant:

[0039] Calculate the cross-sectional area of ​​the mud outlet 4 using the formula S=q0 / v / 3600;

[0040] Where: q0 - the initial sludge flow rate when the number of sludge chambers is 1, unit: m³ / h;

[0041] q0=1.82×1.82×0.025×12.5=1.035(m³ / h);

[0042] v-The sludge flow velocity at the sludge distribution port of the filter cloth is measured in m / s. The value is taken as the initial sludge flow velocity within the sludge channel during the initial sludge injection phase. The total length of the sludge chamber in the center of the 120 filter plates is 22.4 m. The time it takes for the sludge to flow from the center hole of the first filter plate group to the center hole of the last filter plate group is set to 2 minutes. Calculations are as follows:

[0043] v = 22.4 / 2 / 60 = 0.187 (m / s)

[0044] The cross-sectional area of ​​the cloth clamp at the mud opening is the sum of the cross-sectional areas of several grooves:

[0045] S=1.035 / 0.187 / 3600=0.0015(㎡)

[0046] A sludge dewatering method for achieving deep sludge dewatering includes two stages: sludge injection and filtration.

[0047] Mud injection stage I: Based on the moisture content of the incoming mud, use the formula "M=G" 干 The required quantitative sludge injection volume M for filter cake is calculated using " / (1-W%)+dosage"; where:

[0048] Based on laboratory experimental data, the optimal thickness of the filter cake after pressing was determined to be 12.5 mm, and the optimal moisture content after pressing was 57%. 干 =N×(1.82×1.82×mud cake thickness)×(1-mud cake moisture content)×mud cake density

[0049] =120×(1.82×1.82×0.0125)×(1-57%)×1.2

[0050] =2.56 (m³ / time)

[0051] The moisture content of the incoming mud is 92%, and the amount of incoming mud is:

[0052] M = 2.56 / (1 - 92%) + drug dosage

[0053] =32+13

[0054] =45 (m³ / time)

[0055] Mud Injection Stage II: Based on the quantitative mud injection volume M calculated in Mud Injection Stage I as 45 m³ / time, the entire mud injection process is carried out according to Table 1:

[0056] Table 1: Flowchart of the mud injection process

[0057] Step sequence <![CDATA[Slurry injection pump flow rate Q n-1 (m³ / h)]]> <![CDATA[Maximum pressure P n-1 (Bar)]]> <![CDATA[Injection mud duration T n-1 (s)]]> <![CDATA[Cumulative flow rate M of the flowmeter n-1 (m³)]]> 1 145 2.0 240 <![CDATA[M0]]> 2 105 3.0 240 <![CDATA[M2]]> 3 75 4.0 480 <![CDATA[M3]]> 4 40 5.0 300 <![CDATA[M4]]> 5 35 6.0 300 <![CDATA[M5]]> 6 25 7.0 600 <![CDATA[M6]]> 7 20 8.0 800 <![CDATA[M7]]>

[0058] Q0 = K × N × q0, M0, M2, M3, M4, M5, M6, and M7 are the cumulative flow rates of the flow meter at steps 1, 2, 3, 4, 5, 6, and 7, respectively, in m³ / h.

[0059] K - calibration coefficient, here the value is 1.15;

[0060] N - Number of mud cavities (mud cakes), unit: pieces, 120 pieces;

[0061] When the number of sludge chambers is 1, the initial sludge flow rate during sludge injection is 1.035 m³ / h.

[0062] Q0 - Total sludge flow rate at the initial stage of sludge injection, unit: m³ / h;

[0063] Q0=1.15×120×1.035=143 m³ / h;

[0064] Table 1 shows the sludge injection process when a filter press with 120 filter chambers of size 1820×1820×25mm is used to process municipal sludge from a sludge treatment plant. The incoming sludge has a moisture content of 92%, the thickness of the sludge cake after filtration is 8-15mm, and the moisture content of the sludge cake after filtration is 60%. The data in Table 2 vary slightly depending on the properties of the sludge.

[0065] When the set mud injection pump flow rate Q n-1 If the mud injection time is less than T n-1 Seconds, but the mud injection pressure reaches P n-1 At that time, the mud injection flow rate of the mud injection pump is finely adjusted through program control, and the mud injection time reaches T. n-1 And M n-1 When the volume is less than 45m³, proceed to the next step; if the mud injection time reaches T... n-1 At that time, the mud injection pressure was less than P. n-1 M n-1Enter the next step sequence when <M and>; during this process, if M n-1 = 45 m³, at the moment when M n-1 = 45 m³, the sludge injection pump stops injecting sludge, and so on;

[0066] During the 7th step sequence, the working duration is the set duration of 800 s. However, when M7 < 45 m³, the 7th step sequence runs automatically and repeatedly.

[0067] Filter pressing stage: After the sludge injection ends, press water is injected into the pressing water cavity of the diaphragm filter plate group to squeeze the sludge in the sludge cavity 5 until the filter pressing ends.

Claims

1. A sludge dewatering method for achieving deep sludge dewatering, characterized in that: It includes two stages: sludge injection and pressure filtration; Sludge injection stage I: Calculate the required quantitative sludge injection volume M for the pressure filtration sludge cake according to the water content of the incoming sludge by the formula "M = G dry / (1 - W%) + chemical dosage"; Where: M - total single sludge injection volume, unit: m³; G dry - amount of dry sludge basis, that is, the production capacity of the pressure filter during actual production, unit: t / time; W% - water content of the incoming sludge; Sludge injection stage II: Based on the quantitative sludge injection volume M calculated in sludge injection stage I, the entire sludge injection process is carried out in the following steps: Step 1, calculate the sludge flow rate Q0 at the initial stage of sludge injection according to the formula Q0 = K × N × q0, where: Q0 - total sludge flow rate at the initial stage of sludge injection, unit: m³ / h; N - number of sludge chambers, unit: piece; K - calibration coefficient; q0 - sludge flow rate at the initial stage of sludge injection when the number of sludge chambers is 1, unit: m³ / h; Step 2, sludge injection: Sequence 1, the sludge flow rate Q0 at the initial stage of sludge injection, set the pressure as P0, when the sludge injection duration reaches T0, when the cumulative flow rate M0 of the flow meter < M, enter Sequence 2, when M0 = M, the sludge injection pump stops injecting sludge; the sludge flow rate Q1 at the initial stage of sludge injection, set the pressure as P1, when the sludge injection duration reaches T1, when the cumulative flow rate M1 of the flow meter < M, enter Sequence 3, when M1 = M, the sludge injection pump stops injecting sludge, and so on. When the set sludge injection pump flow rate is Qn - 1, if the sludge injection duration is less than Tn - 1 seconds, but the sludge injection pressure reaches Pn - 1, micro-adjust the sludge injection pump flow rate through program control. When the sludge injection duration reaches Tn - 1 and Mn - 1 < M, enter the next sequence; if the sludge injection duration reaches Tn - 1 seconds and the sludge injection pressure is less than Pn - 1, Mn - 1 < M and enter the next sequence; if Mn - 1 = M during this process, the sludge injection pump stops injecting sludge at the moment of Mn - 1 = M; When the set sludge injection pump flow rate is Qn - 1, if the sludge injection duration is less than Tn - 1 seconds, but the sludge injection pressure reaches Pn - 1, micro-adjust the sludge injection pump flow rate through program control. When the sludge injection duration reaches Tn - 1 and Mn - 1 < M, enter the next sequence; if the sludge injection duration reaches Tn - 1 seconds and the sludge injection pressure is less than Pn - 1, Mn - 1 < M and enter the next sequence; if Mn - 1 = M during this process, the sludge injection pump stops injecting sludge at the moment of Mn - 1 = M; Where: Q1, Q2, Qn - 1 are sludge flow rates at different stages, n > 1; Pressure filtration stage: After the sludge injection is completed, inject pressing water into the pressing water chamber of the diaphragm filter plate group to squeeze the sludge in the sludge chamber (5) until the pressure filtration is completed.

2. A filter plate assembly used in the sludge dewatering method for achieving deep sludge dewatering as described in claim 1, comprising a box plate assembly (1), a membrane plate assembly (2), a main cloth clamp (3-1), a secondary cloth clamp (3-2), a sludge outlet (4), and a sludge chamber (5), wherein the box plate assembly (1) and the membrane plate assembly (2) are arranged side by side with intervals, and the space between the box plate assembly (1) and the membrane plate assembly (2) forms the sludge chamber (5); the end face of the main cloth clamp (3-1) of the box plate assembly (1) and the end face of the secondary cloth clamp (3-2) of the membrane plate assembly (2) are in close contact, and the groove (3-1-1) on the end face of the main cloth clamp (3-1) of the box plate assembly (1) and the groove (3-1-1) on the end face of the secondary cloth clamp (3-2) of the membrane plate assembly (2) are in close contact. -2) forms a sludge outlet (4) between the end faces; a sealing ring (1-2) and a filter screen I (1-4) are respectively provided on both sides of the box plate (1-1) in the middle of the box plate assembly (1), the outer ring size of the filter screen I (1-4) is smaller than the inner ring size of the sealing ring (1-2); a filter cloth I (1-3) is provided on both sides of the box plate (1-1), the filter cloth I (1-3) covers the sealing ring (1-2) and the filter screen I (1-4); a sludge channel I (1-5) is provided at the center of the box plate (1-1), the main cloth clamp (3-1) and the auxiliary cloth clamp (3-2) are respectively provided at both ends of the sludge channel I (1-5) and fix the filter screen I (1-4) and the filter cloth I (1-3); Filter screens II (2-4) are respectively provided on both sides of the membrane plate (2-1) in the middle of the membrane plate assembly (2), and filter cloths II (2-3) are respectively provided on the outer sides of the two filter screens II (2-4), and the filter cloths II (2-3) cover the filter screens II (2-4); sludge channel II (2-5) is provided in the center of the membrane plate (2-1), and the main cloth clamp (3-1) and the auxiliary cloth clamp (3-2) are respectively provided at both ends of the sludge channel II (2-5) and press the filter screens II (2-4) and the filter cloths II (2-3). Its features are: The height of the sludge chamber (5) is 23~28mm.

3. The filter plate assembly used in the sludge dewatering method for achieving deep sludge dewatering according to claim 2, characterized in that: Calculate the cross-sectional area of ​​the mud outlet (4) according to the formula S=q0 / v / 3600; Where: S - cross-sectional area of ​​the sludge distribution port of the cloth clamp, the sum of the cross-sectional areas of several grooves; q0 - sludge flow rate in the early stage of sludge injection when the number of sludge chambers is 1, unit: m³ / h, the value is 9.5~12.5 times the volume of a single sludge chamber, unit: m³; v - flow velocity of the sludge distribution port of the cloth clamp, unit: m / s.

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