Municipal sludge and sewer sludge co-processing system

Abstract

The utility model discloses a municipal sludge and sewer sludge co-processing system, which comprises a sewer sludge cleaning and screening device, a mixed sludge drying device, a mixed dry sludge processing device and a condensing device, the mixed sludge drying device is used for drying a sludge mixture formed by municipal sludge and impurity-removed sewer sludge, the sludge mixture is dried by the mixed sludge drying device to generate dry sludge and dry tail gas, the mixed dry sludge treatment device is used for treating the dry sludge, and the condensing device is used for condensing the dry tail gas. Condensed wastewater and non-condensable gas are generated, the condensed wastewater can enter the sewer sludge cleaning and screening device to provide cleaning water for the sewer sludge cleaning and screening device, and the non-condensable gas can enter the mixed dry sludge treatment device. According to the system, the sewage discharge amount and the water consumption are effectively reduced, and cost reduction and efficiency improvement of the whole system are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection, in particular to a system for coordinating treatment of municipal sludge and ditch sludge. Background Art

[0002] With the acceleration of China's industrialization process and the strengthening of urban infrastructure construction, the generation and amount of sewage are constantly increasing, and the sewage treatment rate is gradually increasing, accompanied by a large amount of municipal sludge. Municipal sludge is a large amount of solid waste that is very harmful to the human body and the environment. At present, the reduction and harmless disposal of municipal sludge has become a major common problem that must be solved and cannot be delayed in the process of urban water pollution control and treatment.

[0003] Common sludge disposal technologies mainly include sanitary landfill, land utilization, incineration and building material utilization. For projects with relatively developed economies and large-scale sludge disposal, sludge drying and incineration technology is the main sludge treatment and disposal method, which has the characteristics of large treatment capacity, high reduction degree and complete harmlessness. During the sludge drying process, a large amount of tail gas will be generated. The tail gas contains a large amount of water vapor and pollutants, which need to be condensed through a condenser. After condensation, a large amount of condensed wastewater will be generated. As sewage discharge standards in various places are becoming more and more stringent, the cost of sewage treatment is increasing.

[0004] The mainstream treatment and disposal technology for Tongditch sludge is washing + screening + product resource utilization. In order to ensure the washing and screening effects, several times or even ten times the amount of water of the disposal scale is required to achieve Tongditch sludge treatment and disposal. The water source is generally an external water supply or recycled water. The water demand is large and the corresponding sewage treatment scale is large. Similar to municipal sludge disposal, as sewage discharge standards in various places are becoming more and more stringent, the cost of sewage treatment is increasing.

[0005] Therefore, how to reduce the sewage discharge and water consumption of municipal and ditch sludge treatment and disposal systems, and solve the resource utilization of some ditch sludge products to achieve overall system cost reduction and efficiency improvement is a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide a municipal sludge and ditch sludge coordinated treatment system, which can effectively reduce the sewage discharge and water consumption during municipal and ditch sludge treatment, and achieve overall system cost reduction and efficiency improvement.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A system for co-processing municipal sludge and ditch sludge, comprising a ditch sludge cleaning and screening device, which is used to clean and screen the ditch sludge and separate impurities in the ditch sludge;

[0009] A mixed sludge drying device, used for drying a sludge mixture formed by municipal sludge and ditch sludge from which the impurities are removed, wherein the sludge mixture is dried by the mixed sludge drying device to generate dry sludge and dry tail gas;

[0010] A mixed dry sludge processing device, used for processing the dry sludge;

[0011] A condensation device is used to condense the dry tail gas to generate condensed wastewater and non-condensable gas. The condensed wastewater can enter the ditch sludge cleaning and screening device to provide cleaning water for the ditch sludge cleaning and screening device, and the non-condensable gas can enter the mixed dry sludge treatment device.

[0012] Optionally, the ditch sludge cleaning and screening device includes a ditch sludge cleaning component and a ditch sludge screening component, and the ditch sludge cleaning component and the ditch sludge screening component are connected.

[0013] Optionally, the ditch sludge cleaning assembly includes a sludge storage tank with a debris removal mechanism, a feeding mechanism, a washing drum mechanism and a sand washing mechanism which are connected in sequence;

[0014] The impurity removal mechanism is used for initially cleaning the ditch sludge and separating impurities with a first specification size from the ditch sludge;

[0015] The washing drum mechanism is used to perform secondary washing on the ditch sludge to separate impurities of a second specification size from the ditch sludge;

[0016] The sand washing mechanism is used to wash the ditch sludge three times to separate impurities with a third specification size in the ditch sludge;

[0017] The first specification size>the second specification size>the third specification size.

[0018] Optionally, the ditch sludge screening assembly includes a filtering mechanism, a coagulation and sedimentation mechanism and a mechanical filter pressing mechanism which are connected in sequence;

[0019] The filtering mechanism is used to filter the cleaned ditch sludge to separate fine sand, organic particles and sewage from the ditch sludge, and the organic particles are transported to the mixed dry sludge treatment device through a transport medium;

[0020] A flocculating agent is added into the coagulation and sedimentation mechanism;

[0021] A first circulation pipeline and a second circulation pipeline are provided between the mechanical filter press mechanism and the coagulation and sedimentation mechanism. The first circulation pipeline is used to transport the ditch sludge after sedimentation by the coagulation and sedimentation mechanism to the mechanical filter press mechanism, and the second circulation pipeline is used to transport the sewage after filtering by the mechanical filter press mechanism to the coagulation and sedimentation mechanism.

[0022] Optionally, it also includes a reclaimed water reuse pool, the inlet of which is connected to the coagulation and sedimentation mechanism, the first outlet of which is respectively connected to the sludge storage tank with the impurity removal mechanism, the feeding mechanism, the washing drum mechanism and the sand washing mechanism, and the second outlet of the reclaimed water reuse pool is connected to the sewage treatment system.

[0023] Optionally, the mixed dry sludge treatment device comprises a fluidized bed incinerator, an air preheater and a waste heat boiler which are connected in sequence;

[0024] Limestone is added into the fluidized bed incinerator;

[0025] The condensing device is in communication with the air preheater, and the non-condensable gas can enter the air preheater from the condensing device;

[0026] The waste heat boiler is connected to the mixed sludge drying device, and the saturated steam generated by the waste heat boiler can enter the mixed sludge drying device to dry the sludge mixture.

[0027] Optionally, an auxiliary boiler is also included, which is connected to the mixed sludge drying device, and the auxiliary fuel in the auxiliary boiler can enter the mixed sludge drying device to supplement the heat source.

[0028] Optionally, a dry deacidification device is also included, which includes a dry deacidification tower and a bag dust collector connected in sequence, NaHCO3 is added to the dry deacidification tower, and the bag dust collector is used to remove dust from the ash after incineration.

[0029] Optionally, the bag dust collector includes a primary bag dust collector and a secondary bag dust collector, and slaked lime and activated carbon are added between the primary bag dust collector and the secondary bag dust collector.

[0030] Optionally, the scale of the municipal sludge and the ditch sludge is set according to a ratio of 1:0.5 to 2.

[0031] It can be seen from the above technical scheme that the Tongditch sludge is cleaned and screened by the Tongditch sludge cleaning and screening device to remove impurities. The Tongditch sludge from which impurities are removed is mixed with municipal sludge to form mixed sludge, and then enters the mixed sludge drying device for drying. After drying, dry sludge and dry tail gas are generated, wherein the dry sludge enters the mixed dry sludge treatment device for further treatment, and the dry tail gas enters the condensing device for condensation. The condensed wastewater generated by the condensation enters the Tongditch sludge cleaning and screening device to provide cleaning water for the Tongditch sludge cleaning and screening device, and the non-condensable gas can enter the mixed dry sludge treatment device for further treatment.

[0032] Compared with the prior art, in the municipal sludge and Tongditch sludge coordinated treatment system disclosed in the embodiment of the utility model, the condensed wastewater generated by the sludge drying tail gas entering the condensing device does not need to be disposed of, and can directly enter the Tongditch sludge cleaning and screening device to provide cleaning water for the Tongditch sludge cleaning and screening device, which can be used as water replenishment for the Tongditch sludge cleaning and screening device, so that the Tongditch sludge cleaning and screening device no longer needs external water replenishment. Therefore, the municipal sludge and Tongditch sludge coordinated treatment system effectively reduces the sewage discharge and water consumption, greatly saves the drying and condensing sewage treatment fee, and realizes cost reduction and efficiency improvement of the overall system. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0034] Figure 1 This is a schematic diagram of the process principle of the municipal sludge and ditch sludge coordinated treatment system disclosed in the embodiment of the utility model. DETAILED DESCRIPTION

[0035] In view of this, the core of the utility model is to provide a municipal sludge and ditch sludge coordinated treatment system, which can effectively reduce the sewage discharge and water consumption during the coordinated treatment of municipal sludge and ditch sludge, and solve the resource utilization of some ditch sludge products, thereby achieving cost reduction and efficiency improvement of the overall system.

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] Please refer to Figure 1 The municipal sludge and ditch sludge coordinated treatment system disclosed in the embodiment of the utility model includes a ditch sludge cleaning and screening device, a mixed sludge drying device, a mixed dry sludge treatment device and a condensing device, wherein the ditch sludge cleaning and screening device is used to clean and screen the ditch sludge and separate impurities in the ditch sludge. The mixed sludge drying device is used to dry a sludge mixture formed by municipal sludge and ditch sludge with impurities removed. The sludge mixture is dried by the mixed sludge drying device to generate dry sludge and dry tail gas. The mixed dry sludge treatment device is used to treat the dry sludge. The condensing device is used to condense the dry tail gas to generate condensed wastewater and non-condensable gas. The condensed wastewater can enter the ditch sludge cleaning and screening device to provide cleaning water for the ditch sludge cleaning and screening device, and the non-condensable gas can enter the mixed dry sludge treatment device.

[0038] The Tongditch sludge is cleaned and screened by the Tongditch sludge cleaning and screening device to remove impurities. The Tongditch sludge from which impurities are removed is mixed with municipal sludge to form mixed sludge, and then enters the mixed sludge drying device for drying. After drying, dry sludge and dry tail gas are generated. Among them, the dry sludge enters the mixed dry sludge treatment device for further treatment, and the dry tail gas enters the condensing device for condensation. The condensed wastewater generated by the condensation enters the Tongditch sludge cleaning and screening device to provide cleaning water for the Tongditch sludge cleaning and screening device, and the non-condensable gas can enter the mixed dry sludge treatment device for further treatment.

[0039] Compared with the prior art, in the municipal sludge and Tongditch sludge coordinated treatment system disclosed in the embodiment of the utility model, the condensed wastewater generated by the sludge drying tail gas entering the condensing device does not need to be disposed of, and can directly enter the Tongditch sludge cleaning and screening device to provide cleaning water for the Tongditch sludge cleaning and screening device, which can be used as water replenishment for the Tongditch sludge cleaning and screening device, so that the Tongditch sludge cleaning and screening device no longer needs external water replenishment. Therefore, the municipal sludge and Tongditch sludge coordinated treatment system effectively reduces the sewage discharge and water consumption, greatly saves the drying and condensing sewage treatment fee, and realizes cost reduction and efficiency improvement of the overall system.

[0040] The embodiment of the utility model does not limit the specific structure of the ditch sludge cleaning and screening device. As long as the structure meets the use requirements of the utility model, it is within the protection scope of the utility model.

[0041] As one possible embodiment, the ditch sludge cleaning and screening device disclosed in the embodiment of the utility model includes a ditch sludge cleaning component and a ditch sludge screening component, wherein the ditch sludge cleaning component and the ditch sludge screening component are connected, and the ditch sludge first enters the ditch sludge cleaning component for cleaning to remove large-sized impurities, and then enters the ditch sludge screening component to separate small-sized impurities.

[0042] The embodiment of the utility model does not limit the specific structure of the ditch sludge cleaning component. As long as the structure meets the use requirements of the utility model, it is within the protection scope of the utility model.

[0043] As one possible embodiment, the ditch sludge cleaning assembly disclosed in the embodiment of the utility model includes a sludge storage tank with a debris removal mechanism, a feeding mechanism, a washing drum mechanism and a sand washing mechanism which are connected in sequence.

[0044] The sludge storage tank with a debris removal mechanism is used for initial cleaning of the ditch sludge, wherein the debris removal mechanism (such as a grate, a vibrating screen, etc.) is placed above the sludge storage tank. When the ditch sludge is poured onto the debris removal mechanism, the debris removal mechanism can separate materials of a first size, and the materials of the first size are transported out for landfill disposal.

[0045] The ditch sludge that has been preliminarily screened is stored in a sludge storage tank and transported to a washing drum device by a feeding device. The ditch sludge is washed and filtered by the washing drum device to separate impurities of the second specification size in the ditch sludge. The impurities of the second specification size are transported out for landfill disposal.

[0046] The ditch sludge is then sent to the sand washing device for impurity separation, and the impurities are washed by the washing system of the equipment to separate the impurities with the third specification size in the ditch sludge.

[0047] Among them, impurities of the third specification size are coarse sand, which can be used for resource utilization, such as building materials.

[0048] It should be noted that the first size disclosed in the embodiment of the utility model is greater than the second size and greater than the third size. That is to say, the ditch sludge screening assembly gradually separates the impurities in the ditch sludge from large to small sizes.

[0049] The embodiment of the utility model does not limit the specific structure of the ditch sludge screening assembly. As long as the structure meets the use requirements of the utility model, it is within the protection scope of the utility model.

[0050] As one possible embodiment, the ditch sludge screening assembly disclosed in the embodiment of the utility model includes a filtering mechanism, a coagulation and sedimentation mechanism and a mechanical filter pressing mechanism which are connected in sequence.

[0051] The filter mechanism is used to filter the cleaned ditch sludge, separate fine sand, organic particles and sewage from the ditch sludge, and the organic particles are transported to the mixed dry sludge treatment device through a delivery pump for treatment. The fine sand separated by the filter mechanism is transported out for landfill disposal.

[0052] It should be noted that the organic particulate matter separated by the filtering mechanism has a certain calorific value. The organic particulate matter is transported to the mixed dry sludge treatment device for incineration to generate steam. The steam can be used for sludge drying, which has a positive benefit to the system and can save the cost of transporting and disposing of the original organic particulate matter.

[0053] Among them, flocculants are added into the coagulation and sedimentation mechanism. The flocculants used for coagulation and sedimentation are limited to organic agents (minimize the use of inorganic agents). Organic matter has calorific value and can be used as a supplement to the sludge incineration capacity.

[0054] Among them, there are a first circulation pipeline and a second circulation pipeline between the mechanical filter press mechanism and the coagulation and sedimentation mechanism. The first circulation pipeline is used to transport the ditch sludge after precipitation by the coagulation and sedimentation mechanism to the mechanical filter press mechanism, and the second circulation pipeline is used to transport the sewage after filtering by the mechanical filter press mechanism to the coagulation and sedimentation mechanism, and continue to precipitate in the coagulation and sedimentation mechanism. In this way, a circulation is formed between the filter press mechanism and the coagulation and sedimentation mechanism, thereby maximizing the recycling of the ditch sludge.

[0055] The embodiments of the present invention do not limit the specific structure of the mechanical filter press mechanism. As long as the structure meets the use requirements of the present invention, it is within the protection scope of the present invention.

[0056] As a possible embodiment, the mechanical filter press mechanism disclosed in the embodiment of the utility model can be a plate frame, or a centrifugal dehydration device, etc.

[0057] It should be noted that the municipal sludge and ditch sludge coordinated treatment system disclosed in the embodiment of the utility model also includes a reclaimed water reuse tank, wherein the inlet of the reclaimed water reuse tank is connected with the coagulation and sedimentation mechanism, the first outlet of the reclaimed water reuse tank is respectively connected with the sludge storage tank with the impurity removal mechanism, the feeding mechanism, the washing drum mechanism and the sand washing mechanism, and the second outlet of the reclaimed water reuse tank is connected with the sewage treatment system.

[0058] The clear water overflow from the coagulation and sedimentation mechanism enters the reclaimed water reuse pool, which provides cleaning water for the ditch sludge cleaning and screening device. The overflow from the reclaimed water reuse pool enters the sewage treatment system and is discharged after meeting the standards.

[0059] The embodiments of the present utility model do not limit the specific structure of the mixed dry sludge treatment device. As long as the structure meets the use requirements of the present utility model, it is within the protection scope of the present utility model.

[0060] As one possible embodiment, the mixed dry sludge treatment device disclosed in the embodiment of the utility model includes a fluidized bed incinerator, an air preheater and a waste heat boiler connected in sequence.

[0061] Among them, limestone is added into the fluidized bed incinerator, so that the first removal of acidic gases in the flue gas can be achieved.

[0062] Among them, the condensing device is connected with the air preheater, and the non-condensable gas can enter the air preheater from the condensing device, and after being mixed with the air and preheated in the air preheater, high-temperature flue gas is generated and enters the preheating boiler.

[0063] Among them, the waste heat boiler is connected with the mixed sludge drying device, and the saturated steam generated by the waste heat boiler can enter the mixed sludge drying device. The saturated steam, as the drying heat source of the mixed sludge drying device, can dry the sludge mixture formed by the mixed municipal sludge and the ditch sludge with impurities removed.

[0064] It should be noted that the sludge mixture is generally dried to a moisture content of 40%-60%.

[0065] As a further embodiment, the municipal sludge and ditch sludge coordinated treatment system disclosed in the embodiment of the utility model also includes an auxiliary boiler, wherein the auxiliary boiler is connected to the mixed sludge drying device, and the auxiliary fuel in the auxiliary boiler is burned to generate steam which can enter the mixed sludge drying device as a supplementary heat source.

[0066] When the calorific value of the mixed sludge itself is not enough to sustain combustion, natural gas will be automatically injected into the sulfidized fluidized bed incinerator to assist combustion. The high-temperature flue gas generated by the mixed sludge is first heated by the air preheater, supplied by the fluidized bed incinerator, and then sent to the waste heat boiler to generate saturated steam for sludge drying. The insufficient steam in the drying process is supplemented by the auxiliary boiler.

[0067] It should be noted that the fluidized bed incinerator can be a bubbling fluidized bed or a circulating fluidized bed.

[0068] The air preheater and the waste heat boiler can be separate or integrated, and the air preheater can be in front or the waste heat boiler can be in front.

[0069] Among them, the auxiliary fuel replenishment of the fluidized bed incinerator can be directly sent into the fluidized bed incinerator, or the auxiliary fuel can be burned in the form of an auxiliary boiler to generate steam for sludge drying.

[0070] The municipal sludge and ditch sludge coordinated treatment system disclosed in the embodiment of the utility model also includes a dry deacidification device, wherein the dry deacidification device includes a dry deacidification tower and a bag dust collector connected in sequence, NaHCO3 is added to the dry deacidification tower, and the bag dust collector is used to remove dust from the ash after incineration.

[0071] Among them, the bag dust collector includes a primary bag dust collector and a secondary bag dust collector, and slaked lime and activated carbon are added between the primary bag dust collector and the secondary bag dust collector.

[0072] The medium-temperature flue gas after waste heat recovery is treated by dry deacidification (NaHCO3) + primary bag dust removal + dry deacidification (slaked lime) + activated carbon + secondary bag dust removal and then discharged after meeting the standards. Among them, the incineration ash is discharged from the primary bag dust collector as ordinary waste, and the incineration ash is discharged from the secondary bag dust collector and temporarily treated as hazardous waste.

[0073] The municipal sludge and ditch sludge coordinated treatment system disclosed in the embodiment of the utility model has a three-stage dry deacidification. The use of low-cost limestone can reduce the use of high-cost NaHCO3 and slaked lime, thereby reducing the cost of reagents; the flue gas treatment process does not produce desalinated wastewater, and there is no corresponding wastewater treatment cost, which reduces the operating cost of the municipal sludge disposal system. In addition, a bag dust collector is provided after the secondary deacidification (NaHCO3). Therefore, only the incineration ash produced by the bag dust collector after the tertiary deacidification (slaked lime) is hazardous waste, and the cost of hazardous waste disposal will be slightly reduced due to the reduction in slaked lime consumption.

[0074] It should be noted that the scales of municipal sludge and ditch sludge disclosed in the embodiments of the utility model are set according to a ratio of 1:0.5 to 2.

[0075] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0076] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0077] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A system for the coordinated treatment of municipal sludge and ditch sludge, characterized in that: It includes a ditch sludge cleaning and screening device, which is used to clean and screen the ditch sludge and separate impurities in the ditch sludge; A mixed sludge drying device, used for drying a sludge mixture formed by municipal sludge and ditch sludge from which the impurities are removed, wherein the sludge mixture is dried by the mixed sludge drying device to generate dry sludge and dry tail gas; A mixed dry sludge processing device, used for processing the dry sludge; A condensation device is used to condense the dry tail gas to generate condensed wastewater and non-condensable gas. The condensed wastewater can enter the ditch sludge cleaning and screening device to provide cleaning water for the ditch sludge cleaning and screening device, and the non-condensable gas can enter the mixed dry sludge treatment device.

2. The system for coordinating treatment of municipal sludge and ditch sludge according to claim 1 is characterized in that: The ditch sludge cleaning and screening device comprises a ditch sludge cleaning component and a ditch sludge screening component, and the ditch sludge cleaning component and the ditch sludge screening component are connected.

3. The system for coordinating treatment of municipal sludge and ditch sludge according to claim 2 is characterized in that: The ditch sludge cleaning assembly comprises a sludge storage tank with a debris removal mechanism, a feeding mechanism, a washing drum mechanism and a sand washing mechanism which are connected in sequence; The impurity removal mechanism is used for initially cleaning the ditch sludge and separating impurities with a first specification size from the ditch sludge; The washing drum mechanism is used to perform secondary washing on the ditch sludge to separate impurities of a second specification size from the ditch sludge; The sand washing mechanism is used to wash the ditch sludge three times to separate impurities with a third specification size in the ditch sludge; The first specification size>the second specification size>the third specification size.

4. The system for coordinating treatment of municipal sludge and ditch sludge according to claim 3 is characterized in that: The ditch sludge screening assembly comprises a filtering mechanism, a coagulation and sedimentation mechanism and a mechanical filter pressing mechanism which are connected in sequence; The filtering mechanism is used to filter the cleaned ditch sludge to separate fine sand, organic particles and sewage from the ditch sludge, and the organic particles are transported to the mixed dry sludge treatment device through a transport medium; A flocculating agent is added into the coagulation and sedimentation mechanism; A first circulation pipeline and a second circulation pipeline are provided between the mechanical filter press mechanism and the coagulation and sedimentation mechanism. The first circulation pipeline is used to transport the ditch sludge after sedimentation by the coagulation and sedimentation mechanism to the mechanical filter press mechanism, and the second circulation pipeline is used to transport the sewage after filtering by the mechanical filter press mechanism to the coagulation and sedimentation mechanism.

5. The system for coordinating treatment of municipal sludge and ditch sludge according to claim 4 is characterized in that: It also includes a reclaimed water reuse pool, the inlet of which is connected to the coagulation and sedimentation mechanism, the first outlet of which is respectively connected to the sludge storage tank with the impurity removal mechanism, the feeding mechanism, the washing drum mechanism and the sand washing mechanism, and the second outlet of the reclaimed water reuse pool is connected to the sewage treatment system.

6. The system for coordinating treatment of municipal sludge and ditch sludge according to claim 1 is characterized in that: The mixed dry sludge treatment device comprises a fluidized bed incinerator, an air preheater and a waste heat boiler which are connected in sequence; Limestone is added into the fluidized bed incinerator; The condensing device is in communication with the air preheater, and the non-condensable gas can enter the air preheater from the condensing device; The waste heat boiler is connected to the mixed sludge drying device, and the saturated steam generated by the waste heat boiler can enter the mixed sludge drying device to dry the sludge mixture.

7. The system for coordinating treatment of municipal sludge and ditch sludge according to claim 1 is characterized in that: It also includes an auxiliary boiler, which is connected to the mixed sludge drying device, and the auxiliary fuel in the auxiliary boiler can enter the mixed sludge drying device to supplement the heat source.

8. The system for coordinating treatment of municipal sludge and ditch sludge according to claim 1, characterized in that: It also includes a dry deacidification device, which includes a dry deacidification tower and a bag dust collector which are connected in sequence. NaHCO3 is added to the dry deacidification tower, and the bag dust collector is used to remove dust from the ash after incineration.

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