Sludge dewatering treatment system and sludge dewatering treatment method

Abstract

The present invention discloses a sludge dewatering treatment system and a sludge dewatering treatment method, wherein the system comprises a first-stage sludge dewatering unit, a second-stage sludge dewatering unit, a reclaimed water treatment and reuse unit and a control unit. The first-stage sludge dewatering unit is used to perform flocculation treatment on the sludge to be dewatered, and output the first-stage sludge and the first-stage sewage obtained after the treatment respectively; the second-stage sludge dewatering unit receives and further processes the first-stage sludge, and outputs the second-stage sludge and the second-stage sewage obtained after the dewatering treatment respectively; the reclaimed water treatment and reuse unit is used to receive and filter the first-stage sewage and the second-stage sewage, and return the third-stage sludge obtained by the filtration treatment to the first-stage sludge dewatering unit for flocculation treatment, and return the reclaimed water obtained by the filtration treatment to the second-stage sludge dewatering unit to flush the second-stage sludge dewatering unit; the control unit intelligently controls the overall operation of the sludge dewatering treatment system. The system has the advantages of low sludge moisture content, intelligence, high efficiency and energy saving.

Description

Technical Field

[0001] The present invention relates to the technical field of sludge dewatering, and in particular to a sludge dewatering treatment system and a sludge dewatering treatment method. Background Art

[0002] As the country strengthens water pollution control, the problem of sludge disposal has become increasingly prominent and has received more attention. From sludge composting to auxiliary combustion and landfill, etc. Due to the high water content of sludge, high energy consumption for drying, and high cost, the treatment effect is poor, which is easy to cause secondary pollution.

[0003] At present, sludge dewatering equipment has disadvantages, such as plate and frame dewatering machine: high energy consumption, high labor intensity, poor working environment. Another example is single belt dewatering machine: high moisture content of sludge, requiring a large amount of flushing water. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a sludge dewatering treatment system with low moisture content of the sludge, intelligence, high efficiency and energy saving.

[0005] The invention also provides a sludge dewatering treatment method.

[0006] A sludge dewatering treatment system according to a first embodiment of the present invention comprises:

[0007] A first-stage sludge dewatering unit, wherein the first-stage sludge dewatering unit is used to perform flocculation treatment on the sludge to be dewatered, and output the first-stage sludge and the first-stage sewage obtained after the flocculation treatment respectively;

[0008] A second-stage sludge dehydration unit, wherein the second-stage sludge dehydration unit receives the first-stage sludge outputted from the first-stage sludge dehydration unit, further dehydrates the first-stage sludge, and outputs the second-stage sludge and the second-stage sewage obtained after the dehydration respectively;

[0009] a reclaimed water treatment and reuse unit, the reclaimed water treatment and reuse unit being used to receive and filter the first stage sewage and the second stage sewage, and return the third stage sludge obtained by the filtering treatment to the first stage sludge dewatering unit for flocculation treatment, and return the reclaimed water obtained by the filtering treatment to the second stage sludge dewatering unit to flush the second stage sludge dewatering unit;

[0010] A control unit, wherein the control unit intelligently controls the overall operation of the sludge dewatering treatment system.

[0011] According to the sludge dewatering treatment system of the first aspect of the present invention, the overall operation of the sludge dewatering treatment system is intelligently controlled by a control unit, including intelligent control of the efficient operation of a first-stage sludge dewatering unit, a second-stage sludge dewatering unit and a reclaimed water treatment and reuse unit. The sludge dewatering effect is good, the moisture content of the sludge is low, the overall energy consumption is low, the equipment structure is simple and occupies a small area, there is no need to build a tall factory building, and the use of reclaimed water can be self-sufficient, saving labor.

[0012] According to an embodiment of the first aspect of the present invention, the one-stage sludge dewatering unit includes a PAM preparation device, a sludge inlet mixing device and a one-stage sludge dewatering device, wherein the sludge inlet mixing device is connected between the PAM preparation device and the sludge dewatering device, wherein the PAM preparation device is used to prepare a flocculant and transport the flocculant to the sludge inlet mixing device, the sludge inlet mixing device is used to mix the sludge to be dewatered with the flocculant, and transport the prepared sludge to be dewatered to the one-stage sludge dewatering device, the one-stage sludge dewatering device is used to flocculate the prepared sludge to be dewatered, and output the one-stage sludge and the one-stage sewage obtained after the flocculation treatment respectively.

[0013] According to an embodiment of the first aspect of the present invention, the two-stage sludge dewatering unit includes a sludge spreading device, a two-stage sludge multi-stage dewatering device and a flushing device, the sludge spreading device is used to spread the first stage sludge, the two-stage sludge multi-stage dewatering device is used to further dewater the spread first stage sludge and output the obtained second stage sludge and the second stage sewage respectively, and the flushing device is used to flush the two-stage sludge multi-stage dewatering device.

[0014] According to an embodiment of the first aspect of the present invention, the reclaimed water treatment and reuse unit comprises a fiber disc filter device, and the fiber disc filter device is used to filter the first stage sewage and the second stage sewage to obtain the third stage sludge and the reclaimed water.

[0015] According to a further embodiment of the first aspect of the present invention, the reclaimed water treatment and reuse unit further includes a backwashing device, and the backwashing device is used to flush the fiber rotary disk filter device to circulate the fiber rotary disk filter device.

[0016] According to some embodiments of the first aspect of the present invention, the control unit includes a feed matching control subunit, which is connected to the sludge feed mixing equipment and is used to reasonably mix the ratio of the sludge feed to be dewatered and the flocculant according to the moisture content and mud properties of the sludge to be dewatered.

[0017] According to a further embodiment of the first aspect of the present invention, the control unit also includes a reclaimed water reuse control subunit, which is connected to the reclaimed water treatment and reuse unit and is used to adjust the amount of reclaimed water required for flushing the second-stage sludge dewatering unit.

[0018] According to a further embodiment of the first aspect of the present invention, the control unit also includes a discharge temporary storage control subunit, which is connected to the second-stage sludge dewatering unit and is used to reasonably allocate the temporary storage amount of the second-stage sludge in the second-stage sludge dewatering treatment unit according to the processing volume and the output and transportation of the second-stage sludge.

[0019] According to some embodiments of the first aspect of the present invention, it also includes a first-stage sludge conveying device, a second-stage sludge conveying device and a third-stage sludge conveying device, wherein the first-stage sludge conveying device is connected between the first-stage sludge dewatering unit and the second-stage sludge dewatering unit to convey the first-stage sludge from the first-stage sludge dewatering unit to the second-stage sludge dewatering unit; the second-stage sludge conveying device is connected to the second-stage sludge dewatering unit to output the second-stage sludge from the second-stage sludge dewatering unit; the third-stage sludge conveying device is connected between the reclaimed water treatment and reuse unit and the first-stage sludge dewatering unit to convey the third-stage sludge from the reclaimed water treatment and reuse unit to the first-stage sludge dewatering unit.

[0020] According to some embodiments of the first aspect of the present invention, it also includes a first-stage sewage conveying device, a second-stage sewage conveying device and a grey water conveying device, wherein the first-stage sewage conveying device is connected between the first-stage sludge dewatering unit and the grey water treatment and reuse unit to convey the first-stage sewage from the first-stage sludge dewatering unit to the grey water treatment and reuse unit; the second-stage sewage conveying device is connected between the second-stage sludge dewatering unit and the first-stage sewage conveying device to convey the second-stage sewage from the first-stage sludge dewatering unit to the grey water treatment and reuse unit, and the grey water conveying device is connected between the grey water treatment and reuse unit and the second-stage sludge dewatering unit to convey grey water from the grey water treatment and reuse unit to the second-stage sludge dewatering unit.

[0021] According to the second aspect of the present invention, the sludge dewatering treatment method comprises the following steps:

[0022] In the first stage of dewatering treatment, the sludge to be dewatered is subjected to flocculation treatment in advance, and the free water in the sludge to be dewatered is separated by using a flocculant, thereby obtaining a first stage of sludge and a first stage of sewage with a water content of 75% to 85%;

[0023] Secondary dehydration treatment, wherein the primary sludge is subjected to a wall breaking treatment and a secondary sludge multi-stage dehydration equipment filter press dehydration in sequence, and finally the secondary sludge and secondary sewage having a moisture content of 60% to 70% are obtained;

[0024] Wastewater treatment, combining the first stage sewage and the second stage sewage for filtering treatment to obtain three stages of sludge and reclaimed water, wherein the three stages of sludge are returned to the first stage dehydration treatment step, and the second stage sewage is returned to the second stage dehydration treatment step to flush the second stage sludge multi-stage dehydration equipment.

[0025] According to the sludge dewatering treatment method of the second embodiment of the present invention, the sludge to be dehydrated undergoes a first-stage dehydration treatment to obtain a first-stage sludge with a moisture content of 75% to 85%, and the first-stage sludge undergoes a second-stage dehydration treatment to finally obtain a second-stage sludge with a moisture content of 60% to 70%. Thus, the sludge to be dehydrated undergoes flocculation and filter pressing twice, the dehydration effect is significant, and the moisture content of the sludge is lower. At the same time, the sewage is directly processed and reused after being returned, thereby achieving energy saving and emission reduction.

[0026] According to an embodiment of the second aspect of the present invention, in the step of the first dewatering treatment, the ratio of the feed and the flocculant of the sludge to be dewatered is reasonably adjusted in advance according to the moisture content and mud properties of the sludge to be dewatered.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 It is a schematic diagram of the connection of various units of the sludge dewatering treatment system of the first embodiment of the present invention.

[0030] Figure 2 It is a basic structural diagram of a sludge dewatering treatment system according to an embodiment of the first aspect of the present invention.

[0031] Figure 3 It is a schematic flow chart of a sludge dewatering treatment method according to an embodiment of the second aspect of the present invention.

[0032] Reference numerals

[0033] Sludge dewatering treatment system 100

[0034] First stage sludge dewatering unit 1

[0035] PAM preparation equipment 101 Sludge preparation equipment 102 First stage sludge dewatering equipment 103

[0036] Second stage sludge dewatering unit 2

[0037] Sludge spreading equipment 201 Two-stage sludge multi-stage dewatering equipment 202 Flushing equipment 203

[0038] Recycled water treatment and reuse unit 3

[0039] Fiber disc filter equipment 301 Backwash equipment 302

[0040] Control unit 4

[0041] Feed matching control subunit 401 Recycled water reuse control subunit 402 Discharge temporary storage control subunit 403

[0042] One section of sludge conveying device 11 One section of sewage conveying device 12

[0043] Two-stage sludge conveying device 21 Two-stage sewage conveying device 22

[0044] Three-stage sludge conveying device 31 Recycled water conveying device 32 Overflow pipe 33 DETAILED DESCRIPTION

[0045] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0046] Reference below Figure 1 to Figure 2 The sludge dewatering treatment system 100 according to the first embodiment of the present invention is described.

[0047] like Figure 1 and Figure 2 As shown, the sludge dewatering treatment system 100 according to the first embodiment of the present invention includes a first-stage sludge dewatering unit 1, a second-stage sludge dewatering unit 2, a reclaimed water treatment and reuse unit 3 and a control unit 4. Among them, the first-stage sludge dewatering unit 1 is used to perform flocculation treatment on the sludge to be dewatered, and output the first-stage sludge and the first-stage sewage obtained after the flocculation treatment respectively; the second-stage sludge dewatering unit 2 receives the first-stage sludge output from the first-stage sludge dewatering unit 1 and further dewaters the first-stage sludge, and outputs the second-stage sludge and the second-stage sewage obtained after the dewatering treatment respectively; the reclaimed water treatment and reuse unit 3 is used to receive and filter the first-stage sewage and the second-stage sewage, and return the three-stage sludge obtained by the filtration treatment to the first-stage sludge dewatering unit 1 for flocculation treatment, and return the reclaimed water obtained by the filtration treatment to the second-stage sludge dewatering unit 2 to flush the second-stage sludge dewatering unit 2; the control unit 4 intelligently controls the overall operation of the sludge dewatering treatment system 100.

[0048] Specifically, the first-stage sludge dewatering unit 1 is mainly an equipment unit for flocculating and dewatering the sludge to be dehydrated, and can be assembled and realized by using existing PAM preparation equipment, sludge mixing equipment, general sludge dewatering equipment, etc. The main function of the first-stage sludge dewatering unit 1 is to use flocculants to flocculate the sludge to be dehydrated, and to use flocculants to separate free water from the sludge to be dehydrated to reduce the water content of the sludge to be dehydrated. Experiments have shown that the water content can be reduced to 75% to 85%, thereby obtaining a first-stage sludge and a first-stage sewage, which are automatically transported to downstream processes for treatment. Therefore, the first-stage sludge dewatering unit 1 is mainly used for pretreatment of the second-stage sludge dewatering unit 2.

[0049] The second stage sludge dewatering unit 2 is mainly an equipment unit for further dewatering the first stage sludge output by the first stage sludge dewatering unit 1, and can be assembled and realized by using existing sludge spreading equipment, sludge multi-stage dewatering equipment, flushing equipment, etc. The main function of the second stage sludge dewatering unit 2 is to break the wall of the sludge molecular clusters, separate the water in the sludge molecular clusters, and then enter the sludge multi-stage dewatering equipment for dehydration. During the dehydration process, a large amount of water is required to flush the sludge multi-stage dewatering equipment to ensure the dehydration effect. The sweat rate of the sludge after dehydration, i.e. the second stage sludge, can be further reduced. Experiments have shown that the water content can be reduced to 60% to 70%, and the quality of the second stage sludge is close to 50% of the quality of the first stage sludge, with significant dehydration capacity.

[0050] The reclaimed water treatment and reuse unit 3 is an important component of the sludge dewatering treatment system 100, an important functional unit for energy conservation and emission reduction of the system, and a unit for treating and reusing the wastewater of the sludge dewatering treatment system 100, which can be realized by using existing filtering equipment such as fiber rotary filter equipment. The main function of the reclaimed water treatment and reuse unit 3 is to combine and treat the first stage sewage and the second stage sewage (here, the second stage sewage comes from the water removed from the second stage sludge and the wastewater of the washing equipment), filter the large particles of sludge in the sewage (that is, the first stage sewage and the second stage sewage are combined), so as to obtain the third stage sludge and reclaimed water. The obtained three-stage sludge is automatically transported back to the first stage sludge dewatering unit 1, and the obtained reclaimed water is automatically transported to the second stage sludge dewatering unit 2 such as a high-pressure pump for washing equipment. Since the second stage sludge dewatering unit 2 has a large processing capacity, a high water output rate, a lot of sewage, and a large amount of equipment washing water, the use of the reclaimed water treatment and reuse unit 3 can achieve energy conservation and emission reduction.

[0051] The control unit 4 intelligently controls the operation of the sludge dewatering treatment system 100. In other words, the control unit 4 integrates various parts of the sludge dewatering treatment system 100 and performs analysis and control through an intelligent system.

[0052] According to the sludge dewatering treatment system 100 of the first aspect of the present invention, the control unit 4 intelligently controls the overall operation of the sludge dewatering treatment system 100, including intelligently controlling the efficient operation of the first-stage sludge dewatering unit 1, the second-stage sludge dewatering unit 2 and the reclaimed water treatment and reuse unit 3. The sludge dewatering effect is good, the sludge moisture content is low, the overall energy consumption is low, the equipment structure is simple and occupies a small area, there is no need to build a tall factory building, and the use of reclaimed water can be self-sufficient, saving labor.

[0053] According to an embodiment of the first aspect of the present invention, a first-stage sludge dewatering unit 1 includes a PAM preparation device 101, a sludge inlet mixing device 102 and a first-stage sludge dewatering device 103, wherein the sludge inlet mixing device 102 is connected between the PAM preparation device 101 and the sludge dewatering device, wherein the PAM preparation device 101 is used to prepare a flocculant and transport the flocculant to the sludge inlet mixing device 102, the sludge inlet mixing device 102 is used to mix the sludge to be dewatered and the flocculant, and transport the prepared sludge to be dewatered to the first-stage sludge dewatering device 103, and the first-stage sludge dewatering device 103 is used to flocculate the prepared sludge to be dewatered, and output the first-stage sludge and the first-stage sewage obtained after the flocculation treatment respectively. Therefore, the first stage sludge dewatering unit 1 is mainly an equipment unit for flocculating and dehydrating the sludge to be dehydrated, and flocculating the sludge to be dehydrated by using a flocculant, that is, using the flocculant to separate the free water in the sludge to be dehydrated to reduce the water content of the sludge to be dehydrated. Experiments have shown that the water content can be reduced to 75% to 85%.

[0054] According to an embodiment of the first aspect of the present invention, the two-stage sludge dewatering unit 2 includes a sludge spreading device 201, a two-stage sludge multi-stage dewatering device 202 and a flushing device 203. The sludge spreading device 201 is used to spread a stage of sludge, the two-stage sludge multi-stage dewatering device 202 is used to further dewater the spread first stage of sludge and output the obtained second stage sludge and second stage sewage respectively, and the flushing device 203 is used to flush the two-stage sludge multi-stage dewatering device 202. Therefore, the second-stage sludge dewatering unit 2 is mainly an equipment unit for further dehydrating a section of sludge output by the first-stage sludge dewatering unit 1. The first section of sludge is first spread by the sludge spreading equipment 201, and then enters the sludge multi-stage dehydration device for dehydration. During the dehydration process, the secondary sludge multi-stage dehydration device is flushed with recycled water through the flushing equipment 203 to ensure the dehydration effect. The moisture content of the final dehydrated sludge, i.e., the second-stage sludge, can be further reduced. Experiments have shown that the moisture content can be reduced to 60% to 70%, and the mass of the second-stage sludge is close to 50% of the mass of the first-stage sludge, with significant dehydration capacity.

[0055] According to an embodiment of the first aspect of the present invention, the reclaimed water treatment and reuse unit 3 includes a fiber disc filter device 301, which is used to filter the first stage sewage and the second stage sewage to obtain three stages of sludge and reclaimed water. Thus, the fiber disc filter device 301 is used to filter and treat sewage (i.e., sewage after the first stage sewage and the second stage sewage are combined) so that the sewage can be reused for equipment flushing after treatment, thereby achieving energy conservation and emission reduction. Here, it should be noted that for the excess reclaimed water, the reclaimed water treatment and reuse unit 3 is also provided with an overflow pipe 33 for the overflow of reclaimed water.

[0056] According to an embodiment of the first aspect of the present invention, the reclaimed water treatment and reuse unit 3 further includes a backwashing device 302, and the backwashing device 302 is used to wash the fiber disc filter device 301 so as to circulate the fiber disc filter device 301.

[0057] According to some embodiments of the first aspect of the present invention, the control unit 4 includes a feed matching control subunit 401, which is connected to the sludge feed mixing equipment 102 and is used to reasonably mix the ratio of the sludge feed to be dewatered and the flocculant according to the moisture content and mud properties of the sludge to be dewatered, so as to achieve the most efficient flocculation treatment.

[0058] According to a further embodiment of the first aspect of the present invention, the control unit 4 further includes a reclaimed water reuse control subunit 402, which is connected to the reclaimed water treatment and reuse unit 3 and is used to adjust the amount of reclaimed water required for flushing the second-stage sludge dewatering unit 2. Thus, the reclaimed water can be optimally utilized to efficiently flush the equipment.

[0059] According to a further embodiment of the first aspect of the present invention, the control unit 4 also includes a discharge temporary storage control subunit 403, which is connected to the second-stage sludge dewatering unit 2 and is used to reasonably allocate the temporary storage amount of the second-stage sludge in the second-stage sludge dewatering treatment unit according to the processing volume and the output and transportation of the second-stage sludge.

[0060] According to some embodiments of the first aspect of the present invention, a first-stage sludge conveying device 11, a second-stage sludge conveying device 21 and a third-stage sludge conveying device 31 are also included, wherein the first-stage sludge conveying device 11 is connected between the first-stage sludge dewatering unit 1 and the second-stage sludge dewatering unit 2 to convey the first-stage sludge from the first-stage sludge dewatering unit 1 to the second-stage sludge dewatering unit 2; the second-stage sludge conveying device 21 is connected to the second-stage sludge dewatering unit 2 to output the second-stage sludge from the second-stage sludge dewatering unit 2; the third-stage sludge conveying device 31 is connected between the reclaimed water treatment and reuse unit 3 and the first-stage sludge dewatering unit 1 to convey the third-stage sludge from the reclaimed water treatment and reuse unit 3 to the first-stage sludge dewatering unit 1. Thus, the transportation of the first-stage sludge, the second-stage sludge and the third-stage sludge can be facilitated, the transportation efficiency is high and labor is saved. Here, it is explained that the first-stage sludge conveying device 11, the second-stage sludge conveying device and the third-stage sludge conveying device 31 can all be preferably implemented by a spiral conveying device.

[0061] According to some embodiments of the first aspect of the present invention, a first-stage sewage conveying device 12, a second-stage sewage conveying device 22 and a reclaimed water conveying device 32 are further included, wherein the first-stage sewage conveying device 12 is connected between the first-stage sludge dewatering unit 1 and the reclaimed water treatment and reuse unit 3 to convey the first-stage sewage from the first-stage sludge dewatering unit 1 to the reclaimed water treatment and reuse unit 3; the second-stage sewage conveying device 22 is connected between the second-stage sludge dewatering unit 2 and the first-stage sewage conveying device 12 to convey the second-stage sewage from the first-stage sludge dewatering unit 1 to the reclaimed water treatment and reuse unit 3, and the reclaimed water conveying device 32 is connected between the reclaimed water treatment and reuse unit 3 and the second-stage sludge dewatering unit 2 to convey the reclaimed water from the reclaimed water treatment and reuse unit 3 to the second-stage sludge dewatering unit 2. Thus, the conveying of the first-stage sewage, the second-stage sewage and the reclaimed water can be facilitated. Here, it is explained that the first-stage sewage conveying device 12 and the second-stage sewage conveying device 22 can be realized by water pipes and valves, and the reclaimed water conveying device 32 can be realized by water pipes and high-pressure pumps.

[0062] Reference below Figure 3 The sludge dewatering method according to the second embodiment of the present invention is described below.

[0063] like Figure 3 As shown, the sludge dewatering treatment method according to the second embodiment of the present invention comprises the following steps:

[0064] S1: a first stage of dehydration treatment, in which the sludge to be dehydrated is pre-flocculated and free water in the sludge to be dehydrated is separated by using a flocculant, thereby obtaining a first stage of sludge and a first stage of sewage with a water content of 75% to 85%;

[0065] S2: Second stage dehydration treatment, the first stage sludge is subjected to wall breaking treatment and second stage sludge multi-stage dehydration equipment 202 filter pressing dehydration in sequence, and finally the second stage sludge and second stage sewage with a moisture content of 60% to 70% are obtained;

[0066] S3: Wastewater treatment, the first stage sewage and the second stage sewage are combined and filtered to obtain three stages of sludge and reclaimed water, wherein the three stages of sludge are returned to the first stage dehydration treatment step, and the second stage sewage is returned to the second stage dehydration treatment step to flush the second stage sludge multi-stage dehydration equipment 202.

[0067] According to the sludge dewatering treatment method of the second embodiment of the present invention, the sludge to be dehydrated undergoes a first-stage dehydration treatment to obtain a first-stage sludge with a moisture content of 75% to 85%, and the first-stage sludge undergoes a second-stage dehydration treatment to finally obtain a second-stage sludge with a moisture content of 60% to 70%. Thus, the sludge to be dehydrated undergoes flocculation and filter pressing twice, the dehydration effect is significant, and the moisture content of the sludge is lower. At the same time, the sewage is directly processed and reused after being returned, thereby achieving energy saving and emission reduction.

[0068] According to an embodiment of the second aspect of the present invention, in a dewatering step, the ratio of the feed and flocculant of the sludge to be dewatered is reasonably adjusted in advance according to the moisture content and mud properties of the sludge to be dewatered, so as to achieve the best flocculation and dewatering effect.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0070] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A sludge dewatering treatment system, It is characterized in that include: A first-stage sludge dewatering unit, wherein the first-stage sludge dewatering unit is used to perform flocculation treatment on the sludge to be dewatered, and output the first-stage sludge and the first-stage sewage obtained after the flocculation treatment respectively; A second-stage sludge dehydration unit, wherein the second-stage sludge dehydration unit receives the first-stage sludge outputted from the first-stage sludge dehydration unit, further dehydrates the first-stage sludge, and outputs the second-stage sludge and the second-stage sewage obtained after the dehydration respectively; a reclaimed water treatment and reuse unit, the reclaimed water treatment and reuse unit being used to receive and filter the first stage sewage and the second stage sewage, and return the third stage sludge obtained by the filtering treatment to the first stage sludge dewatering unit for flocculation treatment, and return the reclaimed water obtained by the filtering treatment to the second stage sludge dewatering unit to flush the second stage sludge dewatering unit; A control unit, wherein the control unit intelligently controls the overall operation of the sludge dewatering treatment system; The one-stage sludge dewatering unit comprises a PAM preparation device, an inlet sludge mixing device and a one-stage sludge dewatering device, wherein the inlet sludge mixing device is connected between the PAM preparation device and the one-stage sludge dewatering device, wherein the PAM preparation device is used to prepare a flocculant and transport the flocculant to the inlet sludge mixing device, the inlet sludge mixing device is used to mix the sludge to be dewatered with the flocculant, and transport the prepared sludge to be dewatered to the one-stage sludge dewatering device, the one-stage sludge dewatering device is used to flocculate the prepared sludge to be dewatered, and output the one-stage sludge and the one-stage sewage obtained after the flocculation treatment respectively; The two-stage sludge dewatering unit comprises a sludge spreading device, a two-stage sludge multi-stage dewatering device and a flushing device, wherein the sludge spreading device is used to spread the first stage of sludge, the two-stage sludge multi-stage dewatering device is used to further dewater the spread first stage of sludge and output the obtained second stage sludge and the second stage sewage respectively, and the flushing device is used to flush the two-stage sludge multi-stage dewatering device; The reclaimed water treatment and reuse unit comprises a fiber rotary disk filter device, and the fiber rotary disk filter device is used to filter the first stage sewage and the second stage sewage to obtain the third stage sludge and the reclaimed water; The reclaimed water treatment and reuse unit further includes a backwashing device, which is used to wash the fiber rotary filter device so as to circulate the fiber rotary filter device; The control unit comprises a feed matching control subunit, which is connected to the sludge feed mixing device and is used to reasonably mix the ratio of the sludge feed to be dewatered and the flocculant according to the moisture content and mud properties of the sludge to be dewatered.

2. The sludge dewatering treatment system according to claim 1, It is characterized in that The control unit also includes A reclaimed water reuse control subunit is connected to the reclaimed water treatment and reuse unit and is used to adjust the amount of reclaimed water required for flushing the second-stage sludge dewatering unit.

3. The sludge dewatering treatment system according to claim 2, It is characterized in that The control unit also includes a discharge temporary storage control subunit, which is connected to the second-stage sludge dewatering unit and is used to reasonably allocate the temporary storage amount of the second-stage sludge in the second-stage sludge dewatering unit according to the processing volume and the output and transportation of the second-stage sludge.

4. The sludge dewatering treatment system according to claim 1, It is characterized in that It also includes a first-stage sludge conveying device, a second-stage sludge conveying device and a third-stage sludge conveying device, wherein the first-stage sludge conveying device is connected between the first-stage sludge dewatering unit and the second-stage sludge dewatering unit to convey the first-stage sludge from the first-stage sludge dewatering unit to the second-stage sludge dewatering unit; the second-stage sludge conveying device is connected to the second-stage sludge dewatering unit to output the second-stage sludge from the second-stage sludge dewatering unit; the third-stage sludge conveying device is connected between the reclaimed water treatment and reuse unit and the first-stage sludge dewatering unit to convey the third-stage sludge from the reclaimed water treatment and reuse unit to the first-stage sludge dewatering unit.

5. The sludge dewatering treatment system according to claim 1, It is characterized in that It also includes a first-stage sewage conveying device, a second-stage sewage conveying device and a reclaimed water conveying device, wherein the first-stage sewage conveying device is connected between the first-stage sludge dewatering unit and the reclaimed water treatment and reuse unit to convey the first-stage sewage from the first-stage sludge dewatering unit to the reclaimed water treatment and reuse unit; the second-stage sewage conveying device is connected between the second-stage sludge dewatering unit and the first-stage sewage conveying device to convey the second-stage sewage from the first-stage sludge dewatering unit to the reclaimed water treatment and reuse unit, and the reclaimed water conveying device is connected between the reclaimed water treatment and reuse unit and the second-stage sludge dewatering unit to convey the reclaimed water from the reclaimed water treatment and reuse unit to the second-stage sludge dewatering unit.

6. A sludge dewatering method, It is characterized in that Using the sludge dewatering treatment system according to any one of claims 1 to 5, the sludge dewatering treatment method comprises the following steps: In the first stage of dewatering, the sludge to be dewatered is pre-flocculated and free water is separated from the sludge to be dewatered by using a flocculant, thereby obtaining a first stage of sludge and a first stage of sewage with a moisture content of 75% to 85%; Secondary dehydration treatment, wherein the primary sludge is subjected to a wall breaking treatment and a secondary sludge multi-stage dehydration equipment filter press dehydration in sequence, and finally the secondary sludge and secondary sewage having a moisture content of 60% to 70% are obtained; Wastewater treatment, combining the first stage sewage and the second stage sewage for filtering treatment to obtain three stages of sludge and reclaimed water, wherein the three stages of sludge are returned to the first stage dehydration treatment step, and the second stage sewage is returned to the second stage dehydration treatment step to flush the second stage sludge multi-stage dehydration equipment.

7. The sludge dewatering method according to claim 6, It is characterized in that In the step of the first dehydration treatment, the ratio of the feed and the flocculant of the sludge to be dehydrated is reasonably adjusted in advance according to the water content and mud properties of the sludge to be dehydrated.

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