Sewage comprehensive utilization system

Abstract

The utility model relates to a sewage comprehensive utilization system which comprises a circulating cooling water system and a first sewage utilization system, and the first sewage utilization system comprises a drying condensate water pipeline and a deacidification wastewater pipeline connected into the drying condensate water pipeline; wherein the drying condensate water pipeline is used for collecting condensate water, and the condensate water is obtained from wet materials; the deacidification wastewater pipeline is used for collecting deacidification wastewater; the condensed water is used for diluting the deacidified wastewater, and the diluted deacidified wastewater is used as supplement of industrial water and enters a circulating cooling water system. According to the utility model, vaporous water generated in the material drying equipment is introduced into the condensing equipment to be liquefied to obtain condensed water, the condensed water is mixed with the deacidified wastewater, the deacidified wastewater is diluted to reduce the chlorine salt content, and the diluted deacidified wastewater is used as a part of circulating cooling water, so that the circulating cooling water is recycled. The purposes of effectively recycling water vapor and deacidified wastewater evaporated by drying materials, saving water for factories, reducing the scale of a sewage treatment system and reducing the initial investment are achieved.

Description

Technical Field

[0001] The utility model belongs to the field of sewage treatment, and more specifically, relates to a sewage comprehensive utilization system. Background Art

[0002] During the solid waste treatment process, the temperature of various industrial equipment or media will rise during operation. Therefore, it is necessary to cool these equipment. The common cooling method is to use low-temperature cooling water to cool the equipment or media that need to be cooled down, and the high-temperature cooling water that absorbs heat returns to the cooling device for cooling and recycling. However, due to the circulation of cooling water in a high-temperature environment, there will also be relatively large losses, and it is often necessary to supplement cooling water additionally to ensure that the water volume and cooling effect of the cooling water meet the requirements.

[0003] In addition, when using a plasma melting furnace to dispose of bottom slag and sludge to form harmless vitreous bodies, the quench water quenches the high-temperature liquid vitreous bodies, and a large amount of water will be evaporated in this process. The quench water also often needs to be supplemented additionally.

[0004] Furthermore, when using a plasma furnace to melt materials, before the solid waste enters the plasma melting furnace for heating and melting, it needs to be pretreated. A key step is to dry the solid waste to reduce the water content in the solid waste and avoid wasting more energy during the heating and melting process. Usually, the sludge with a water content of 60% and the bottom slag with a water content of 30% are dried to a water content of 20% and 5% respectively, and the water-containing carrier gas is directly discharged. The evaporated water is relatively wasted while increasing the emissions of waste gas.

[0005] For the tail gas purification device configured in the plasma melting furnace, the wastewater generated during the deacidification process is generally directly discharged into the sewage treatment system as sewage, and the wastewater such as desalted water concentrate is also directly discharged into the sewage treatment system as sewage. These waters are not fully utilized, and the treatment cost is relatively high, increasing the operating cost.

[0006] Chinese Patent Document CN201620034773.6 discloses a sludge-like substance drying and incineration system. This sludge-like substance drying and incineration system uses granular heat carriers to recover the heat carried out by the high-temperature tail gas and steam from the furnace. This sludge-like substance drying and incineration system only directly incinerates about 60% of the wet sludge-like substance in the furnace, and the remaining wet sludge-like substance is dried using the heat at the tail of the furnace and then incinerated in the furnace, effectively reducing energy consumption and improving the heat utilization rate, and realizing the full utilization of the heat in the fluidized bed furnace.

[0007] However, the above patent and the prior art do not provide solutions or any technical inspirations for the treatment of the water generated by the drying of the foregoing materials, the deacidification wastewater, and the desalted water concentrate remaining in the desalination equipment. Content of the Utility Model

[0008] In view of the defects that the gaseous water, deacidification wastewater, and concentrated brine of desalted water generated during material drying cannot be effectively recycled, the purpose of the present utility model is to provide a comprehensive sewage utilization system.

[0009] The technical solution provided by the present utility model is as follows:

[0010] A comprehensive sewage utilization system, including a circulating cooling water system; further including:

[0011] A first sewage utilization system, the first sewage utilization system including a drying condensate pipeline and a deacidification wastewater pipeline connected to the drying condensate pipeline;

[0012] Among them, the drying condensate pipeline is used to collect condensate water, and the condensate water is obtained from wet materials; the deacidification wastewater pipeline is used to collect deacidification wastewater;

[0013] The condensate water is used to dilute the deacidification wastewater, and the circulating cooling water in the circulating cooling water system includes the diluted deacidification wastewater and industrial water.

[0014] Further, it also includes a second sewage utilization system, the second sewage utilization system including a quench water pipeline, and the quench water in the quench water pipeline includes concentrated brine of desalted water discharged from a desalination device and industrial water, and the quench water is used to cool the liquid vitreous body formed by treating hazardous waste in a plasma melting furnace.

[0015] Further, the drying condensate pipeline includes a gas conveying device and a separation device connected by a pipeline; the gas conveying device introduces a drying carrier gas into the separation device, and the separation device is used to extract gaseous water from wet materials.

[0016] Further, the separation device includes a material drying device and a dust removal device connected by a first pipeline, and the dust removal device is connected to a condensation device by a second pipeline.

[0017] Further, the material drying device is used to obtain gaseous water from wet materials, and when the gaseous water is mixed with the drying carrier gas, a water-containing carrier gas is formed;

[0018] The dust removal device is used to purify the water-containing carrier gas to form a purified water-containing carrier gas;

[0019] The condensation device is used to liquefy the gaseous water in the purified water-containing carrier gas into condensate water.

[0020] Further, the dust removal device is a water film dust collector, and when the water-containing carrier gas passes through the water film dust collector for treatment, a sewage treatment system is used to treat the dust-containing wastewater.

[0021] Further, the condensation device is connected to the circulating cooling water system through a third pipeline, and the deacidification wastewater pipeline is connected to the third pipeline.

[0022] Further, the material drying equipment includes a bottom slag dryer and a sludge dryer.

[0023] Further, the second sewage utilization system further includes a slag pool located below the melting furnace and a sedimentation and filtration pool located downstream of the slag pool; the slag pool is used to collect the vitreous slag cooled by the quench water; the sedimentation and filtration pool is used to sediment and filter other sundries in the quench water.

[0024] Further, the circulating cooling water system includes a cooling device and a heat load device. The water outlet of the cooling device is connected to the water inlet of the heat load device through a fifth pipeline; the water outlet of the heat load device is connected to the water inlet of the cooling device through a sixth pipeline; the heat load device is used for heat exchange of the liquid; the fifth pipeline is provided with a first circulation pump.

[0025] Adopting the technical solution provided by the present utility model, compared with the prior art, it has the following beneficial effects:

[0026] (1) In the sewage comprehensive utilization system of the present utility model, the water vapor generated in the drying equipment is led to a condensation device for condensation to obtain makeup water, which is then mixed with the deacidification wastewater to dilute the deacidification wastewater and reduce the chloride salt content. The diluted deacidification wastewater is used as a supplement to industrial water. The diluted deacidification wastewater and industrial water are mixed to form circulating cooling water and enter the circulating cooling water system. In this way, the water vapor and deacidification wastewater generated in the drying device are effectively recycled, saving factory water, reducing the scale of the sewage treatment system, and achieving the purpose of reducing the initial investment.

[0027] (2) The present utility model solves the problem in the prior art that the concentrated water of demineralized water cannot be effectively utilized and is directly discharged into the sewage treatment system, resulting in a relatively large amount of sewage treatment and final discharge. Due to the high temperature of the liquid vitreous slag and large evaporation loss of the quench water, the present utility model uses the concentrated water of demineralized water as the makeup water for the quench water, making full use of the concentrated water of demineralized water and reducing the treatment volume and investment cost of the sewage treatment system.

[0028] (3) In the present utility model, the condensed water, deacidification wastewater, and concentrated water of demineralized water are used as makeup water, greatly saving industrial water and reducing sewage discharge. After recycling, a small amount of circulating cooling water sewage and quench water sewage enter the sewage treatment system for treatment. The wastewater received by the sewage treatment system is about three-quarters less than the usual practice, achieving the purpose of zero discharge of wastewater utilization. Description of the Drawings

[0029] Figure 1 It is a schematic diagram of the overall process of the sewage comprehensive utilization system in an embodiment of the present application;

[0030] Figure 2 Schematic diagram of the dilution process of deacidification wastewater in an embodiment of the present application;

[0031] Figure 3 Schematic diagram of the overall treatment process of the sewage treatment system in an embodiment of the present application;

[0032] Figure 4 Schematic diagram of the detailed process of the sewage treatment system in an embodiment of the present application.

[0033] Description of the reference numerals in the schematic diagram:

[0034] Material drying equipment 11, dust removal equipment 12, condensation equipment 13, first pipeline 14, second pipeline 15, third pipeline 16, deacidification wastewater pipeline 17;

[0035] Quenching water pipeline 21, slag pond 22, sedimentation and filtration tank 23, fourth pipeline 24, second circulation pump 25;

[0036] Sewage treatment system 3, homogenization and buffer tank 201, defluorination reaction tank 202, primary sedimentation tank 203, reduction tank 204, heavy metal removal reaction tank 205, secondary sedimentation tank 206, multi-media filter 207, water tank 208, sludge tank 209, filter press 210;

[0037] Cooling equipment 41, heat load equipment 42, fifth pipeline 43, first circulation pump 44, sixth pipeline 45. Detailed implementation manners

[0038] To further understand the content of the present utility model, the present utility model will be described in detail with reference to the accompanying drawings and embodiments.

[0039] The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions under which the present utility model can be implemented. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like cited in this specification are only for the convenience of clear narration and are not used to limit the implementable scope. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the implementable scope of the present utility model.

[0040] During the process of using a plasma furnace to melt and dispose of bottom slag and surface-treated sludge to form harmless vitreous bodies, the sewage generated contains almost no organic matter, but contains trace amounts of heavy metals and fluorides harmful to the human body. Generally, this sewage needs to be treated to meet the standards before discharge. The usual practice is to dry the sludge with 60% water content and the bottom slag with 30% water content to a water content of 20% and 5% respectively, directly discharge the water-containing carrier gas, discharge the sewage from the plasma furnace slag quenching, and discharge the acid removal wastewater and desalinated water concentrate from the tail gas treatment system after treatment. Whether it is the water generated during the drying process of the sludge with 60% water content and the bottom slag with 30% water content, or the acid removal wastewater and desalinated water concentrate generated during the production process of factory equipment, these waters are treated and discharged without being fully utilized, which not only increases the operating cost but also causes waste of resources. However, the circulating cooling water system requires a large amount of makeup water. If this part can be reasonably utilized as makeup water in the cooling equipment, it can not only save factory water but also reduce the scale and investment of the sewage treatment system.

[0041] A sewage comprehensive utilization system of the present application makes full use of the gaseous water obtained by drying wet materials, acid removal wastewater, and desalinated water concentrate, greatly reducing the discharge of this sewage. Through scientific treatment methods, it protects and saves water resources and maintains the stability of the environment and the health of the ecosystem.

[0042] Example 1

[0043] A sewage comprehensive utilization system of the present application includes a first sewage utilization system, a circulating cooling water system, and a sewage treatment system 3. The most crucial part is the first sewage utilization system. The purpose of this first sewage utilization system is to liquefy the gaseous water generated during the evaporation and drying process of wet materials into condensed water, and the condensed water is used to dilute the acid removal wastewater so that the diluted acid removal wastewater can be utilized subsequently.

[0044] The solid waste disposed of by the plasma melting furnace, that is, wet materials, generally includes sludge with a water content of about 60% and bottom slag with a water content of about 30%. Before entering the melting furnace, these wet materials need to be dried so that the water content of the sludge finally reaches about 20% and the water content of the bottom slag finally reaches about 5%.

[0045] The acid removal wastewater generated by the plasma melting furnace tail gas treatment system is not suitable for direct utilization due to its high chloride salt content. If it can be fully mixed with the water extracted during the drying of the materials, the chloride salt content will be diluted, and the acid removal wastewater can be recycled.

[0046] The first sewage utilization system includes a drying condensate pipeline and an acid removal wastewater pipeline 17. The acid removal wastewater pipeline 17 is located at the end of the drying condensate pipeline. The drying condensate pipeline is used to collect the water dried out from the materials, that is, condensed water. The condensed water dilutes the acid removal wastewater, and the diluted acid removal wastewater is mixed with industrial water to form circulating cooling water and enters the circulating cooling water system.

[0047] The drying condensate pipeline includes gas conveying equipment and separation equipment. The gas conveying equipment is preferably a fan. The separation equipment includes material drying equipment 11 and dust removal equipment 12. The material drying equipment 11 and the dust removal equipment 12 are connected through a first pipeline 14, and the dust removal equipment 12 and the condensation equipment 13 are connected through a second pipeline 15.

[0048] The material drying equipment 11 includes a bottom slag drying machine and a sludge drying machine. The material drying equipment 11 obtains gaseous water by evaporating the wet material. The dry carrier gas introduced by the gas conveying device can not only mix with the gaseous water, but also guide the mixed water-containing carrier gas. Under the action of the airflow, the water-containing carrier gas enters the dust removal equipment 12 from the first pipeline 14, and the dust removal equipment 12 purifies the water-containing carrier gas to form clean water carrier gas.

[0049] After the dust removal step is completed, the generated dust-containing wastewater is discharged to the sewage treatment system 3 for treatment, and the clean water carrier gas enters the condensation equipment 13, which liquefies the gaseous water in the clean water carrier gas into condensed water for standby use. The dust removal equipment is preferably a water film dust collector.

[0050] After the purified water carrier gas is condensed, the gas and liquid are separated, and part of the excess carrier gas is discharged into the atmosphere, and the remaining carrier gas is introduced back to the material drying equipment 11 for recycling.

[0051] The cooling water provided by the circulating cooling water system is used to cool and exchange heat for the equipment or media that need to dissipate heat in the factory, so as to avoid excessive energy consumption or local damage of the equipment due to overheating. The circulating cooling water system includes a cooling device 41 and a heat load device 42. The heat load device 42 transfers heat to the circulating cooling water, and the temperature of the heat load device 42 itself decreases. The temperature of the circulating cooling water increases and returns to the cooling device 41. The cooling device 41 reduces the temperature of the circulating cooling water and returns to the circulating cooling water system for heat exchange again.

[0052] The water outlet of the cooling device 41 is connected to the water inlet of the heat load device 42 through the fifth pipeline 43, while the water outlet of the heat load 42 is connected to the water inlet of the cooling device 41 through the sixth pipeline 45. Therefore, the cooling device 41 and the heat load device 42 form a circulating system. The condensation device 13 at the end of the drying condensation water pipeline is connected to the cooling device 41 through the third pipeline 16, and the deacidification wastewater pipeline 17 is connected to the third pipeline 16. The deacidification wastewater diluted by the condensed water enters the cooling device 41 as a supplement to the industrial water. The water entering the cooling device 41 exchanges heat with the atmosphere, the temperature decreases, and at the same time, 1.5% - 2% of the total amount of circulating water evaporates. Then it is sent to the heat load device 42 by the first circulation pump 44 for heat exchange. The amount of condensed water and deacidification wastewater is relatively small compared to the overall water consumption of the cooling device 41. Therefore, the insufficient part of the water is supplemented by industrial water before the first circulation pump 44. After heat exchange, the temperature of the circulating cooling water rises and returns to the cooling device 41 through the sixth pipeline 45. The cooling device 41 is preferably an open cooling tower.

[0053] The construction cost of the open cooling tower is low, but the operating cost is relatively high. The disadvantage is that the water consumption is high. Therefore, using the drying condensed water and deacidification wastewater as its makeup water can greatly reduce the operating cost and reduce the scale of the sewage treatment system, further reducing the investment and operating cost of the factory.

[0054] After the circulating cooling water evaporates and drifts water multiple times, the salt content will gradually increase. Scale inhibitors and corrosion inhibitors are introduced into the fifth pipeline 43 to form stable complexes with calcium and magnesium ions in the cooling water, preventing their precipitation and crystallization, and forming a protective film on the surface of the metal pipeline to slow down corrosion.

[0055] After the circulating cooling water is recycled multiple times, the salt content increases. In order to reduce the salt content and prevent equipment corrosion, sewage discharge is required, and the sewage enters the sewage treatment system 3 for treatment.

[0056] Embodiment 2

[0057] This embodiment is a further solution based on Embodiment 1. A sewage comprehensive utilization system of this patent application further includes a second sewage utilization system, and the second sewage utilization system is for recycling the concentrated water of desalted water.

[0058] Raw water enters the pretreatment equipment at the front end of the desalination equipment to remove suspended solids and organic matter in the water, and then enters the high-pressure pump. The high-pressure pump increases the pressure of the water so that it is higher than the osmotic pressure of the reverse osmosis membrane. The water pressurized by the high-pressure pump passes through the reverse osmosis membrane. This membrane has very small pores and can exclude small molecules such as salts in the water, allowing only water molecules to pass through. In this way, desalted water is obtained, and the concentrated water of desalted water intercepted by the reverse osmosis membrane is the concentrated water of desalted water. Direct discharge of the concentrated water of desalted water is not only unfriendly to the ecological environment but also a waste of resources.

[0059] In this embodiment, the second sewage utilization system includes a quench water pipeline 21. Desalted brine and industrial water are synchronously introduced into the quench water pipeline 21. The desalted brine serves as a supplement to the industrial water, and after mixing, quench water is formed, which is used to cool the liquid vitreous body formed by treating hazardous waste in a plasma melting furnace.

[0060] The desalted brine accesses the quench water pipeline 21 through a fourth pipeline 24. A second circulation pump 25 is provided on the quench water pipeline 21, and the main function of the second circulation pump 25 is to provide the power for the continuous circulation of the system.

[0061] The second sewage utilization system further includes a slag pool 22 located below the melting furnace and a sedimentation and filtration tank 23 located after the slag pool 22. The slag pool 22 collects the vitreous slag cooled by the quench water, and the sedimentation and filtration tank 23 sedimentates and filters other impurities except the vitreous slag. The supernatant of the sedimentation and filtration tank 23 enters the quench water pipeline for reuse. Since the salt content of the quench water evaporated and concentrated due to high temperature increases, in order to prevent the corrosion of equipment from accelerating due to the increase in salinity, sewage discharge is required, and the discharged sewage enters the sewage treatment system 3 for treatment and then discharge.

[0062] Since a large amount of the quench water is evaporated after cooling the liquid vitreous body, replenishment is also required. The desalted brine can be fully utilized as a supplement to the quench water.

[0063] Embodiment 3

[0064] This embodiment is a further solution based on Embodiment 1 and Embodiment 2. The treatment steps of the sewage treatment system 3 are as follows:

[0065] A1. Homogenize the sewage in a homogenization and buffer tank 201 to obtain primary wastewater;

[0066] A2. Adjust the pH value of the primary wastewater to 7 - 8 in a defluorination reaction tank 202 and add a defluorinating agent to obtain secondary wastewater;

[0067] A3. Add a flocculant and a coagulant to the secondary wastewater in a primary sedimentation tank 203 to obtain supernatant, primary sludge, and tertiary wastewater;

[0068] A4. Adjust the pH value of the tertiary wastewater to about 4 in a reduction tank 204; and reduce hexavalent chromium in the tertiary wastewater to trivalent chromium to obtain quaternary wastewater;

[0069] A5. Adjust the pH value of the quaternary wastewater to 7 - 8 in a heavy metal removal reaction tank 205 and convert heavy metal ions in the quaternary wastewater into hydroxide precipitates to obtain quinary wastewater;

[0070] A6. Add a flocculant to the quinary wastewater in a secondary sedimentation tank 206 to obtain secondary sludge and sextary wastewater;

[0071] A7. Remove the residual heavy metals, calcium and magnesium ions in the six-stage wastewater in the multi-media filter 207 to obtain concentrated water and qualified wastewater;

[0072] A8. Drain the qualified wastewater into the discharge water tank 208.

[0073] In the step A1, the sewage includes one or more of dust-containing wastewater, circulating cooling water blowdown, quench water blowdown, floor flushing water, laboratory flushing water, and initial rainwater.

[0074] In the step A2, the method for adjusting the pH value of the primary wastewater to 7-8 is to add sulfuric acid or sodium hydroxide to the primary wastewater.

[0075] In the step A2, the defluorinating agent is calcium chloride.

[0076] In the step A3, the coagulant and flocculant include PAC and PAM.

[0077] In the step A3, the supernatant is returned to the defluorination reaction tank 202 for step A2.

[0078] The primary sludge in the step A3 enters the sludge tank 209.

[0079] In the step A4, the method for adjusting the pH value to about 4 is to add sulfuric acid to the tertiary wastewater.

[0080] In the step A4, the reducing agent used to reduce hexavalent chromium in the tertiary wastewater to trivalent chromium is sodium bisulfate.

[0081] In the step A5, the method for adjusting the pH value to 7-8 is to add sodium hydroxide to the quaternary wastewater.

[0082] In the step A5, the heavy metal ions include, but are not limited to, Cu 2+ , Hg 2+ , Pb 2+ , Cr 3+ and Zn 2+ and one or more of them.

[0083] In the step A5, the heavy metal ion capturing agent used to convert the heavy metal ions in the quaternary wastewater into hydroxide precipitates is a chemical precipitating agent such as sodium hydroxide or calcium hydroxide in the chemical precipitation method.

[0084] In the step A6, the coagulant and flocculant include PAC and PAM.

[0085] The secondary sludge in the step A6 enters the sludge tank 209.

[0086] In the step A7, the concentrated water is returned to the homogenization buffer tank 201.

[0087] The primary sludge and the secondary sludge in the sludge tank 209 enter the filter press 210 ; the primary sludge and the secondary sludge in the sludge tank 209 are filtered in the filter press 210 to obtain filter cake and filtrate.

[0088] The filter cake is melted using a plasma melting furnace.

[0089] The filtrate returns to the homogenization buffer tank 201.

[0090] Example 4

[0091] This embodiment is a further solution based on Embodiment 1, Embodiment 2, and Embodiment 3. A method for using a sewage comprehensive utilization system of the present application includes the following steps:

[0092] The gas conveying equipment introduces drying carrier gas into the material drying equipment;

[0093] The drying carrier gas is mixed with the gaseous water obtained by evaporating the wet material in the material drying equipment to form a water-containing carrier gas, and the water-containing carrier gas is introduced into the dust removal equipment through the gas conveying equipment;

[0094] The dust removal equipment removes and purifies the water-containing carrier gas, and the dust-containing wastewater enters the sewage treatment system for treatment;

[0095] The gaseous water in the clean water carrier gas enters the condensation equipment and is liquefied into condensed water. The condensed water dilutes the deacidified wastewater. The diluted deacidified wastewater enters the circulating cooling water system as a supplement to industrial water. The cooling water in the circulating cooling water system has an increased salt content after multiple cycles and is introduced into the sewage treatment system for treatment.

[0096] After the clean water carrier gas is condensed, the gas and liquid are separated, part of the excess carrier gas is discharged into the atmosphere, and the rest of the carrier gas is led back to the material drying equipment for recycling;

[0097] Add corrosion inhibitors and scale inhibitors to the cooling water to form stable complexes with calcium and magnesium ions in the cooling water to prevent precipitation and crystallization, and form a protective film on the surface of the pipe to slow down metal corrosion;

[0098] Demineralized water is used as a supplement to industrial water and flows into the quenching water pipeline synchronously with industrial water. The mixed quenching water is used to cool the liquid glass formed by the melting furnace to treat hazardous waste;

[0099] The used quenching water is concentrated due to evaporation loss, and the salt content and other impurities increase. After sedimentation and filtration, the sewage is discharged into the sewage treatment system for treatment, and the supernatant enters the quenching water pipeline for recycling.

[0100] The above has schematically described the present utility model and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present utility model, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the creation of the present utility model, design without creativity structural modes and embodiments similar to the technical solution, they shall fall within the protection scope of the present utility model.

Claims

1. A sewage comprehensive utilization system, including a circulating cooling water system; It is characterized in that Also includes: A first sewage utilization system, the first sewage utilization system comprising a drying condensed water pipeline and a deacidified wastewater pipeline (17) connected to the drying condensed water pipeline; Wherein, the drying condensed water pipeline is used to collect condensed water, and the condensed water is obtained from the wet material; the deacidification wastewater pipeline (17) is used to collect deacidification wastewater; The condensed water is used to dilute the deacidified wastewater, and the circulating cooling water in the circulating cooling water system includes the diluted deacidified wastewater and industrial water; The drying condensed water pipeline includes a gas conveying device and a separation device connected by a pipeline; the gas conveying device introduces the drying carrier gas into the separation device, and the separation device is used to extract gaseous water from the wet material.

2. A sewage comprehensive utilization system according to claim 1, characterized in that: It also includes a second sewage utilization system, which includes a chilled water pipeline (21). The chilled water in the chilled water pipeline (21) includes desalted water concentrate discharged from a desalination device and industrial water. The chilled water is used to cool liquid glass formed by a plasma melting furnace to treat hazardous waste.

3. A sewage comprehensive utilization system according to claim 1, characterized in that: The separation device comprises a material drying device (11) and a dust removal device (12) connected via a first pipeline (14); the dust removal device (12) is connected to a condensation device (13) via a second pipeline (15).

4. A sewage comprehensive utilization system according to claim 3, characterized in that: The material drying device (11) is used to obtain gaseous water from the wet material, and when the gaseous water is mixed with the drying carrier gas, a water-containing carrier gas is formed; The dust removal device (12) is used to purify the water-containing carrier gas to form clean water carrier gas; The condensation device (13) is used to liquefy gaseous water in the purified water carrier gas into condensed water.

5. A sewage comprehensive utilization system according to claim 4, characterized in that: The dust removal equipment (12) is a water film dust collector. After the water-containing carrier gas is treated by the water film dust collector, the sewage treatment system (3) is used to treat the dust-containing wastewater.

6. A sewage comprehensive utilization system according to claim 5, characterized in that: The condensing device (13) is connected to the circulating cooling water system via a third pipeline (16), and the deacidification wastewater pipeline (17) is connected to the third pipeline (16).

7. A sewage comprehensive utilization system according to claim 6, characterized in that: The material drying equipment (11) comprises a bottom slag dryer and a sludge dryer.

8. A sewage comprehensive utilization system according to claim 2, characterized in that: The second sewage utilization system also includes a slag pool (22) located below the melting furnace and a sedimentation and filtration pool (23) located downstream of the slag pool (22); the slag pool (22) is used to collect glass slag after being cooled by quenching water; the sedimentation and filtration pool (23) is used to precipitate and filter other debris in the quenching water.

9. A sewage comprehensive utilization system according to any one of claims 1 to 8, characterized in that: The circulating cooling water system comprises a cooling device (41) and a heat load device (42); the water outlet of the cooling device (41) is connected to the water inlet of the heat load device (42) via a fifth pipe (43); the water outlet of the heat load device (42) is connected to the water inlet of the cooling device (41) via a sixth pipe (45); the heat load device (42) is used to perform heat exchange on a liquid; and the fifth pipe (43) is provided with a first circulating pump (44).

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