CN108129005B - System for utilize hydrothermal treatment high concentration organic waste water to release heat and carry out sludge drying - Google Patents
System for utilize hydrothermal treatment high concentration organic waste water to release heat and carry out sludge drying Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/84—Biological processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/90—Odorous compounds not provided for in groups B01D2257/00 - B01D2257/708
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention relates to a system for sludge drying by utilizing heat released by hydrothermal treatment of high-concentration organic wastewater, belonging to the technical field of novel environmental protection. Sending high-concentration organic wastewater and a medicament into a mixer for homogenization treatment, preheating a mixed material by a preheater, sending the mixed material into a hydrothermal reactor for hydrothermal oxidation treatment, cooling a product, and then sending the cooled product into a biochemical treatment tank for further treatment; the heat generated by the hydrothermal reaction is taken away by a circulating heat exchange cooling device to keep the temperature of the hydrothermal reaction constant, and the reacted materials are cooled; part of the heated working medium in the circulating heat exchange cooling device is used for preheating the hydrothermal reaction material, the rest of the working medium flows through the sludge drying bed for drying treatment of the sludge, and the temperature of the working medium which passes through the sludge drying bed and the preheater is reduced and flows back to the water storage tank for continuous cooling heat exchange of the hydrothermal system; and (3) conveying the dewatered sludge to a sludge drying bed for drying treatment, and introducing odor generated in the drying process into a biological filter for deodorization treatment.
Description
Technical Field
The invention belongs to the technical field of novel environmental protection, and particularly relates to a system for sludge drying by utilizing heat released by hydrothermal treatment of high-concentration organic wastewater.
Background
Water pollution is one of the main environmental problems faced by China at present, and industrial wastewater accounts for more than 70% of the total sewage, and the industrial wastewater is mainly high-concentration organic wastewater. The high-concentration organic wastewater generally refers to wastewater with COD of more than 2000mg/L discharged by industries such as papermaking, leather, food and the like. These wastewaters contain a large amount of organic matter such as carbohydrates, fats, proteins, cellulose, etc., and if discharged directly, cause serious pollution. The high-concentration organic wastewater has large pollution degree to environmental water and high treatment difficulty, is one of the difficult problems in the field of domestic and foreign environmental protection research, and has attracted more and more attention on purification treatment. Because the common wastewater treatment method is difficult to satisfy the economic and technical requirements of purification treatment, the research on purification treatment, recovery and comprehensive utilization of high-concentration organic wastewater has gradually become one of the hot research subjects of international environmental protection technology.
At present, environmental protection workers at home and abroad research a plurality of treatment methods for high-concentration organic wastewater, including a farmland irrigation method, a biochemical degradation method, an ultrafiltration method, a concentration drying method, a concentration combustion method, a super oxidation method and the like. The farmland irrigation method is not suitable for general use, only simple neutralization and precipitation treatment are carried out on the wastewater, and the method is limited by the properties of the wastewater, geographical conditions and seasons; the biochemical degradation method is used for performing a series of treatments such as neutralization, sedimentation, anaerobic treatment, aerobic treatment and the like on the wastewater, so that the BOD value of the wastewater is greatly reduced, but the biochemical degradation method is only suitable for treating the wastewater with higher BOD value and is sensitive to the concentration of the wastewater; the ultrafiltration method is used for neutralizing, precipitating and ultrafiltering the wastewater, and filter residue can be used for other purposes or for additional treatment, and the method has higher requirements on filter cloth; the concentration drying method is used for neutralizing, precipitating, concentrating, drying and the like the wastewater, and dry powder can be used as organic fertilizer or other materials, but the energy consumption is higher; the concentration combustion method is used for neutralizing and concentrating the waste water, the heat after combustion is used for concentrating the waste water or producing and recycling, the ash can be used for other purposes, the condensed water in the concentration process can be used as the production dilution water, but the investment cost is higher; the super-oxidation method heats and pressurizes the wastewater to a supercritical state for deep oxidation and recovers heat energy, but the requirement on equipment is very high, and the super-oxidation technology of the wastewater is still in a laboratory test stage.
Along with the continuous improvement of municipal and industrial sewage treatment rate and sewage treatment degree in China, the sludge yield is increased year by year. After the urban sludge is subjected to concentration and dehydration treatment, the water content of the urban sludge is still about 80%, the volume of the urban sludge is large, and most of pollutants removed from the sewage are accumulated in the sludge. A large amount of municipal and industrial sludge will cause serious secondary pollution if not properly disposed. At present, the methods for sludge disposal mainly comprise landfill, land utilization, incineration and the like. Direct landfill occupies a large amount of land, and leachate pollutes underground water; land utilization is greatly limited due to large transportation volume, difficult dispersion and easy pollution to underground water; direct incineration also has a low calorific value due to low solid content, and a large amount of auxiliary fuel is consumed, thereby significantly increasing the treatment cost. Therefore, the key to solve many problems encountered in the sludge treatment process at present is to carry out drying treatment on the municipal sludge and reduce the water content of the sludge.
The traditional sludge drying method adopts a sludge drying bed form, the sludge is flatly paved on an outdoor drying bed, and the sludge is dried through natural ventilation and solar radiation. The drying mode occupies a large area and is easily influenced by climate. Modern drying processes mainly include heat drying and biological drying. The heat drying mainly comprises direct heating, indirect heating and radiation heating, namely, water in the sludge is evaporated by an external heating source. The direct heating type and indirect heating type sludge drying process has the advantages of small occupied area, obvious reduction, flexible product application and the like, but has high investment and operation cost, high equipment operation energy consumption and potential safety hazard of dust explosion. The radiant heating type sludge drying system comprises processes such as infrared drying, microwave drying and solar drying, wherein the solar drying process does not consume fossil energy and is particularly concerned by people, but the method has large floor area, the treatment effect is restricted by weather and seasonal conditions, the use of the improved heat storage type and heat pump type solar drying processes overcomes the restriction of the weather and the seasonal conditions to a certain extent, the defect of large floor area is still not overcome, the floor area can be reduced by increasing the sludge stacking thickness, the energy consumption of drying operation is increased by frequent pile-turning operation in the drying process, the investment and the operation energy consumption are increased by using a heat pump device, and the large-area popularization and application of the sludge solar drying system in China are limited. Therefore, the development of a more economical and energy-saving sludge drying technology is an urgent need for municipal sludge treatment in China.
The hydrothermal reaction is a reaction carried out at a high temperature and a high pressure using water as a solvent. The advanced oxidation technology which is rising and developing rapidly in recent years has the characteristics of high reaction speed, easy decomposition of chemical substances difficult to degrade, low energy consumption, even heat recovery and the like (the hydrothermal reaction is a combustion reaction which is carried out in water, is an exothermic reaction, can carry out spontaneous combustion without external heat when the concentration of organic substances is more than 2 percent, and can recover residual heat when the concentration of the organic substances is more than 5 percent), so the advanced oxidation technology is particularly attractive. Hydrothermal conditions water has a sharp change in density, ionic product, viscosity and dielectric constant compared to ordinary water, and exhibits properties similar to viscous gases, which make it an ideal medium for treating organic waste.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method and a system for sludge drying by utilizing heat released by hydrothermal treatment of high-concentration organic wastewater. The use of the hydrothermal oxidation technology for treating the high-concentration organic wastewater overcomes the defects of large investment, low efficiency and complex process of the existing high-concentration organic wastewater treatment technology, and simultaneously fully utilizes the heat generated by the hydrothermal reaction to carry out the drying of the sludge, thereby achieving the purpose of treating the waste by the waste.
The purpose of the invention can be realized by the following technical scheme:
a system for sludge drying by utilizing heat released by hydrothermally treating high-concentration organic wastewater comprises a high-concentration organic wastewater hydrothermal treatment device, a sludge drying device and a circulating heat exchange cooling device,
the high-concentration organic wastewater hydrothermal treatment device comprises: a mixer for mixing the high-concentration organic wastewater with a medicament, a hydrothermal reactor for carrying out hydrothermal reaction on the high-concentration organic wastewater and the medicament mixed liquid, and a biochemical treatment tank for treating the wastewater after the hydrothermal treatment;
the sludge drying device comprises: a sludge drying chamber for drying sludge, a biological filter for treating sludge drying tail gas, a sludge drying bed arranged in the sludge drying chamber, a heating channel for circulating water to flow through arranged below the sludge drying bed,
the circulation heat exchange cooling device comprises: a preheater, a heat exchanger, a cooler and a water storage tank,
the preheater is provided with two fluid channels, wherein one fluid channel is used for enabling the high-concentration organic wastewater and the medicament mixed liquid to flow through, and the other fluid channel is a circulating water channel;
the heat exchanger comprises a circulating water channel for circulating water, the heat exchanger is used for exchanging heat with the hydrothermal reactor,
the cooler is provided with two fluid channels, wherein one fluid channel is used for enabling the waste water after the hydrothermal treatment to flow through, and the other fluid channel is a circulating water channel;
a circulating water channel of the preheater, a circulating water channel of the heat exchanger, a circulating water channel of the cooler, a heating channel in the sludge drying chamber and a water storage tank are connected to form a circulating loop through which water flows circularly, and a circulating pump is arranged on the circulating loop;
the heat exchanger is used for taking away heat generated when hydrothermal treatment is carried out on high-concentration organic wastewater, the cooler is used for taking away heat of wastewater after the hydrothermal treatment, a part of heated water flows into the preheater and is used for preheating mixed liquid of the high-concentration organic wastewater and a medicament, and the rest of heated water flows through the heating channel in the sludge drying chamber and is used for drying treatment of sludge.
Further, the inlet end of the heating channel in the sludge drying chamber is connected with the other end of the circulating water channel of the preheater through a pipeline, the circulating water channel of the heat exchanger is connected with the inlet end of the heating channel in the sludge drying chamber through a pipeline, one end of the circulating water channel of the cooler is connected with the inlet end of the heating channel in the sludge drying chamber through a pipeline, and the other end of the circulating water channel is connected with the inlet end of the heating channel in the sludge drying chamber.
Furthermore, a flow control valve is arranged on a pipeline between the heat exchanger and the water storage tank, a flow control valve is arranged on a pipeline between the cooler and the water storage tank, a section of pipeline between the heat exchanger and the water storage tank and a section of pipeline between the cooler and the water storage tank share one pipeline, a circulating pump is arranged on the shared pipeline,
the pipeline between the preheater and the heating channel in the sludge drying chamber is provided with a flow control valve, and the pipeline between the outlet of the hydrothermal reactor and the cooler is provided with a back pressure valve.
Further, still include high concentration organic waste water storage pond and dosing tank, pass through the tube coupling between high concentration organic waste water storage pond and the blender, pass through the tube coupling between dosing tank and the blender.
Furthermore, a high-pressure metering pump and a high-pressure metering valve are arranged on a pipeline between the high-concentration organic wastewater storage tank and the mixer, and a high-pressure metering pump and a high-pressure metering valve are arranged on a pipeline between the chemical adding tank and the mixer.
Further, the sludge drying chamber is communicated with the biological filter through an air pipeline, and an induced draft fan is arranged on the air pipeline.
Furthermore, the system also comprises a control room with a computer control system, a temperature sensor in the hydrothermal reactor, electromagnetic valves and temperature sensors on all sections of pipelines are respectively connected to the computer control system, sensors for detecting the temperature in the hydrothermal reactor and the feeding temperature are communicated with the computer control system, and a motor and a circulating pump of an induced draft fan in the system are controlled by the computer control system.
Preferably, the mixer is a static mixer.
A method for sludge drying by utilizing heat released by hydrothermal treatment of high-concentration organic wastewater is carried out by adopting the system and comprises the following steps:
(1) respectively sending high-concentration organic wastewater and a medicament into a mixer for homogenization treatment by using a high-pressure metering pump, preheating a mixed material by using a preheater, sending the preheated mixed material into a high-temperature and high-pressure hydrothermal reactor for hydrothermal oxidation treatment, and cooling a product and then sending the cooled product into a biochemical treatment tank for further treatment;
(2) the heat generated by the hydrothermal reaction is taken away by a circulating heat exchange cooling device to keep the temperature of the hydrothermal reaction constant, and the reacted materials are cooled; part of the heated working medium in the circulating heat exchange cooling device is used for preheating the hydrothermal reaction material, the rest of the working medium flows through the sludge drying bed for drying treatment of the sludge, and the temperature of the working medium which passes through the sludge drying bed and the preheater is reduced and flows back to the water storage tank for continuous cooling heat exchange of the hydrothermal system;
(3) and (3) conveying the dewatered sludge to a sludge drying bed for drying treatment, discharging odor generated in the drying process through a draught fan, and introducing the odor into a biological filter for deodorization treatment.
The high-concentration organic wastewater in the step (1) refers to organic wastewater or landfill leachate with the concentration of organic matters more than 5% discharged in the production of light industry, chemical industry, food, medicine, pesticide and other industries.
The agent added in the hydrothermal oxidation treatment in the step (1) is an oxidant, and the oxidant is H2O2、O2Oxygen-enriched air and O3Or one or more of calcium peroxide, and the addition amount of the oxidant is 90-120% of the oxygen demand of the organic matters in the completely oxidized wastewater.
The hydrothermal reaction conditions in the step (1) are as follows: the temperature is 250-500 ℃, the pressure is 5-30 MPa, and the time is 0.1-10 min.
The sludge in the step (3) comprises municipal sewage sludge, municipal water supply sludge, municipal drainage channel sludge and municipal river sludge.
And (4) deodorizing the secondary pollution odor generated by the dried sludge in the step (3) through a biological filter.
The invention sends high-concentration organic wastewater and oxidant into a hydrothermal reactor for hydrothermal oxidation treatment, and dries the heat-producing sludge by hydrothermal reaction. The invention can not only carry out economic and efficient harmless treatment on high-concentration organic wastewater difficult to biochemically process, reduce COD and lighten the load of subsequent biochemical treatment, but also fully utilize the heat generated by hydrothermal reaction to carry out sludge drying, is green and environment-friendly, saves energy, and the dried product can be used as fuel, fertilizer, soil conditioner and the like for resource utilization or direct landfill.
Compared with the prior art, the invention has the following advantages:
(1) the invention utilizes hydrothermal technology to treat high-concentration organic wastewater, and the obtained low-concentration biochemical residual liquid can be subjected to further biochemical treatment, so that the load of subsequent biochemical treatment is reduced;
(2) the sludge drying is carried out by utilizing the heat generated in the process of treating the high-concentration organic wastewater by hydrothermal oxidation, the purpose of sludge drying can be achieved under the condition of not consuming new energy, and the heat released by hydrothermal oxidation is fully utilized, so that an effective way for recycling waste and treating waste with waste is practically developed, remarkable social and environmental benefits can be generated, and remarkable economic benefits can be obtained.
Drawings
FIG. 1 is a block diagram of the process flow of the present invention.
In the figure, 1 is a high-concentration organic wastewater storage tank, 2 is a dosing tank, 3 and 4 are high-pressure metering pumps, 5 and 6 are high-pressure metering valves, 7 is a mixer, 8, 13 and 15 flow control valves, 9 is a preheater, 10 is a hydrothermal reactor, 11 is a heat exchanger, 12 is a back pressure valve, 14 is a cooler, 16 is a biochemical treatment tank, 17 is a circulating pump, 18 is a water storage tank, 19 is a sludge drying bed, 20 is a sludge drying chamber, 21 is an induced draft fan, and 22 is a biological filter tank.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
A system for sludge drying by using heat released from high-concentration organic wastewater treated by hydrothermal method, as shown in figure 1, comprises a high-concentration organic wastewater hydrothermal treatment device, a sludge drying device and a circulating heat exchange cooling device,
the high-concentration organic wastewater hydrothermal treatment device comprises a mixer 7 for mixing high-concentration organic wastewater with a medicament, a hydrothermal reactor 10 for carrying out hydrothermal reaction on the high-concentration organic wastewater and the medicament mixed liquid, and a biochemical treatment tank 16 for treating the wastewater after the hydrothermal treatment;
the sludge drying device comprises a sludge drying chamber 20 for drying sludge and a biological filter 22 for treating sludge drying tail gas, a sludge drying bed 19 is arranged in the sludge drying chamber 20, a heating channel for circulating water to flow through is arranged below the sludge drying bed 19,
the circulating heat exchange cooling device comprises a preheater 9, a heat exchanger 11, a cooler 14 and a water storage tank 18, wherein the preheater 9 is provided with two fluid channels, one fluid channel is used for enabling a high-concentration organic wastewater and medicament mixed solution to flow through, and the other fluid channel is a circulating water channel; the heat exchanger 11 comprises a circulating water channel for circulating water, the heat exchanger 11 is used for exchanging heat with the hydrothermal reactor 10, and the cooler 14 is provided with two fluid channels, wherein one fluid channel is used for enabling waste water after hydrothermal treatment to flow through, and the other fluid channel is a circulating water channel; a circulating water channel of the preheater 9, a circulating water channel of the heat exchanger 11, a circulating water channel of the cooler 14, a heating channel in the sludge drying chamber 20 and a water storage tank 18 are connected to form a circulating loop through which water flows circularly, and a circulating pump 17 is arranged on the circulating loop; the heat exchanger 11 is used for taking away heat generated during hydrothermal treatment of high-concentration organic wastewater, the cooler 14 is used for taking away heat of wastewater after hydrothermal treatment, a part of heated water flows into the preheater 9 for preheating a mixed liquid of the high-concentration organic wastewater and a medicament, and the rest of the heated water flows through a heating channel in the sludge drying chamber 20 for drying sludge.
The circulating water channel one end of preheater 9 passes through tube coupling reservoir 18, the other end passes through the entry end of tube coupling heating channel in the sludge drying room 20, tube coupling reservoir 18 is passed through to heat exchanger 11's circulating water channel one end, the other end passes through the entry end of tube coupling heating channel in the sludge drying room 20, tube coupling reservoir 18 is passed through to cooler 14's circulating water channel one end, the other end passes through the entry end of tube coupling heating channel in the sludge drying room 20, the heating channel exit end in the sludge drying room 20 passes through tube coupling reservoir 18.
A flow control valve 13 is arranged on a pipeline between the heat exchanger 11 and the water storage tank 18, a flow control valve 15 is arranged on a pipeline between the cooler 14 and the water storage tank 18, a section of pipeline between the heat exchanger 11 and the water storage tank 18 and a section of pipeline between the cooler 14 and the water storage tank 18 share one pipeline, a circulating pump 17 is arranged on the shared pipeline, a flow control valve 8 is arranged on a pipeline between the preheater 9 and a heating channel in the sludge drying chamber 20, and a back pressure valve 12 is arranged on a pipeline between an outlet of the hydrothermal reactor 10 and the cooler 14. The main function of the back-pressure valve 12 is to create a back-pressure in the line intended for the reaction, a pressure of maximum 20MPa being achieved in the reaction tube of the hydrothermal reactor by adjusting the back-pressure valve 12.
The system further comprises a high-concentration organic wastewater storage pool 1 and a dosing tank 2, the high-concentration organic wastewater storage pool 1 is connected with the mixer 7 through a pipeline, and the dosing tank 2 is connected with the mixer 7 through a pipeline. A high-pressure metering pump 3 and a high-pressure metering valve 5 are arranged on a pipeline between the high-concentration organic wastewater storage tank 1 and the mixer 7, and a high-pressure metering pump 4 and a high-pressure metering valve 6 are arranged on a pipeline between the chemical adding tank 2 and the mixer 7.
The sludge drying chamber 20 is communicated with the biological filter 22 through an air pipeline, and an induced draft fan 21 is arranged on the air pipeline.
The system also comprises a control room with a computer control system, a temperature sensor in the hydrothermal reactor, electromagnetic valves and temperature sensors on each section of pipeline are respectively connected to the computer control system, sensors for detecting the temperature in the hydrothermal reactor and the feeding temperature are communicated with the computer control system, and a motor and a circulating pump of an induced draft fan in the system are controlled by the computer control system.
Wherein the mixer 7 is a static mixer.
Wherein, the hydrothermal reactor 10 is heated by an induction heating furnace.
A method for sludge drying by utilizing heat released by hydrothermal treatment of high-concentration organic wastewater is carried out by adopting the system and comprises the following steps:
(1) respectively sending high-concentration organic wastewater and a medicament into a mixer for homogenization treatment by using a high-pressure metering pump, preheating a mixed material by using a preheater, sending the preheated mixed material into a high-temperature and high-pressure hydrothermal reactor for hydrothermal oxidation treatment, and cooling a product and then sending the cooled product into a biochemical treatment tank for further treatment;
(2) the heat generated by the hydrothermal reaction is taken away by a circulating heat exchange cooling device to keep the temperature of the hydrothermal reaction constant, and the reacted materials are cooled; part of the heated working medium in the circulating heat exchange cooling device is used for preheating the hydrothermal reaction material, the rest of the working medium flows through the sludge drying bed for drying treatment of the sludge, and the temperature of the working medium which passes through the sludge drying bed and the preheater is reduced and flows back to the water storage tank for continuous cooling heat exchange of the hydrothermal system;
(3) and (3) conveying the dewatered sludge to a sludge drying bed for drying treatment, discharging odor generated in the drying process through a draught fan, and introducing the odor into a biological filter for deodorization treatment.
The high-concentration organic wastewater in the step (1) refers to organic wastewater or landfill leachate with the concentration of organic matters more than 5% discharged in the production of light industry, chemical industry, food, medicine, pesticide and other industries.
The agent added in the hydrothermal oxidation treatment in the step (1) is an oxidant, and the oxidant is H2O2、O2Oxygen-enriched air and O3Or one or more of calcium peroxide, and the addition amount of the oxidant is 90-120% of the oxygen demand of the organic matters in the completely oxidized wastewater.
The hydrothermal reaction conditions in the step (1) are as follows: the temperature is 250-500 ℃, the pressure is 5-30 MPa, and the time is 0.1-10 min.
The sludge in the step (3) comprises municipal sewage plant sludge, municipal water supply sludge, municipal drainage channel sludge, industrial sludge and river and lake sludge.
And (4) deodorizing the secondary pollution odor generated by the dried sludge in the step (3) through a biological filter.
Referring to fig. 1, the basic principle and mode of the present invention are as follows:
the high-concentration organic wastewater storage tank 1 and the dosing tank 2 respectively send the high-concentration organic wastewater and an oxidant into a mixer 7 through high-pressure metering valves 3 and 4 for homogenization treatment, then send the mixture into a hydrothermal reactor 10 for hydrothermal oxidation treatment after the mixture is preheated by a preheater 9, transfer heat to a heat exchanger 11 in a salt bath (the mass ratio of potassium nitrate to sodium nitrate is about 1:1), then flow through a backpressure valve 12 and a cooler 14, and finally flow into a biochemical treatment tank 16. The main function of the back-pressure valve 12 is to create a back-pressure in the line intended for the reaction, a pressure of maximum 20MPa being achieved in the reaction tube of the hydrothermal reactor by adjusting the back-pressure valve 12. The temperature of the hydrothermal reaction is generally controlled to be 250-500 ℃, the pressure is 5-30 MPa, and the reaction time is 0.1-10 min.
Working medium from a water storage tank 17 flows through flow control valves 13 and 15 respectively to enter a heat exchanger 11 and a cooler 14, and hot working medium enters a ventilation heat exchange chamber through a pipeline to dry sludge. The turn-push machine on the sludge drying bed turns the pile at regular time, so as to ensure the drying uniformity and promote the water loss. The drying period is generally 3-5 days, the temperature is usually controlled to be 40-50 ℃, and after drying is finished, the water content of the sludge material can be reduced to 30-40%. Hot and wet steam generated by sludge drying is sucked out by a draught fan 21 through a pipeline at the top of the sludge drying chamber, and is deodorized and evacuated by a biological filter 22. The working medium passing through the ventilation heat exchange chamber flows back to the water storage tank 18 for recycling. Part of the hot working medium flowing to the sludge drying bed 19 enters the preheater 9 through the flow control valve 8, preheats the high-concentration organic wastewater and the oxidant in the preheater, and then flows back to the water storage tank for recycling. The circulating pump 17 provides power for the circulation of the working medium.
The invention utilizes the heat produced by the high-concentration organic wastewater to carry out sludge drying, converts the high-concentration organic wastewater into the easily-treated biochemical residual liquid, does not consume other heat sources in the whole drying process, and saves energy. The method for performing harmless treatment on high-concentration organic wastewater and drying sludge by using hydrothermal reaction can realize industrial scale treatment of sludge, and has the advantages of high treatment speed, short period, low investment and operation cost and the like. The method actually develops an effective way for recycling the waste and treating the waste with the waste, and can generate remarkable social and environmental benefits and obtain remarkable economic benefits.
The technical scheme of the method can realize that the hydrothermal oxidation reaction reduces the COD of the high-concentration organic wastewater, fully utilizes the heat generated by the hydrothermal reaction to carry out sludge drying, and can operate stably, efficiently and with low energy consumption.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A system for sludge drying by utilizing heat released by hydrothermal treatment of high-concentration organic wastewater is characterized by comprising a high-concentration organic wastewater hydrothermal treatment device, a sludge drying device and a circulating heat exchange cooling device,
the high-concentration organic wastewater hydrothermal treatment device comprises: a mixer (7) for mixing the high-concentration organic wastewater with the medicament, a hydrothermal reactor (10) for carrying out hydrothermal reaction on the mixed liquid of the high-concentration organic wastewater and the medicament, and a biochemical treatment tank (16) for treating the wastewater after the hydrothermal treatment;
the sludge drying device comprises: a sludge drying chamber (20) for drying sludge and a biological filter (22) for treating sludge drying tail gas, wherein a sludge drying bed (19) is arranged in the sludge drying chamber (20), a heating channel for circulating water to flow through is arranged below the sludge drying bed (19),
the circulation heat exchange cooling device comprises: a preheater (9), a heat exchanger (11), a cooler (14) and a water storage tank (18),
the preheater (9) is provided with two fluid channels, wherein one fluid channel is used for enabling the mixed liquid of the high-concentration organic wastewater and the medicament to flow through, and the other fluid channel is a circulating water channel;
the heat exchanger (11) comprises a circulating water channel for circulating water, the heat exchanger (11) is used for exchanging heat with the hydrothermal reactor (10),
the cooler (14) is provided with two fluid channels, wherein one fluid channel is used for enabling the waste water after the hydrothermal treatment to flow through, and the other fluid channel is a circulating water channel;
a circulating water channel of the preheater (9), a circulating water channel of the heat exchanger (11), a circulating water channel of the cooler (14), a heating channel in the sludge drying chamber (20) and a water storage tank (18) are connected to form a circulating loop through which water flows circularly, and a circulating pump (17) is arranged on the circulating loop;
heat exchanger (11) are used for taking away the heat that produces when hydrothermal treatment high concentration organic waste water, cooler (14) are used for taking away the heat of hydrothermal treatment back waste water, and the water that is heated partly flows into preheater (9) and is used for preheating high concentration organic waste water and medicament mixed liquid, and the heating channel in the sludge drying room (20) of remaining flowing through is used for the mummification of mud to handle.
2. The system for sludge drying by using the heat release of the hydrothermal treatment of the high-concentration organic wastewater as claimed in claim 1,
one end of a circulating water channel of the preheater (9) is connected with the water storage tank (18) through a pipeline, the other end of the circulating water channel is connected with the inlet end of a heating channel in the sludge drying chamber (20) through a pipeline,
one end of a circulating water channel of the heat exchanger (11) is connected with the water storage tank (18) through a pipeline, the other end of the circulating water channel is connected with the inlet end of a heating channel in the sludge drying chamber (20) through a pipeline,
one end of a circulating water channel of the cooler (14) is connected with the water storage tank (18) through a pipeline, the other end of the circulating water channel is connected with the inlet end of a heating channel in the sludge drying chamber (20) through a pipeline,
the outlet end of a heating channel in the sludge drying chamber (20) is connected with a water storage tank (18) through a pipeline.
3. The system for sludge drying by utilizing the heat release of the high-concentration organic wastewater generated by the hydrothermal treatment of the claim 1, further comprising a high-concentration organic wastewater storage tank (1) and a chemical feeding tank (2), wherein the high-concentration organic wastewater storage tank (1) is connected with the mixer (7) through a pipeline, and the chemical feeding tank (2) is connected with the mixer (7) through a pipeline.
4. The system for sludge drying by utilizing the heat release of the high-concentration organic wastewater in the hydrothermal treatment as claimed in claim 1, wherein the sludge drying chamber (20) is communicated with the biological filter (22) through an air pipeline, and an induced draft fan (21) is arranged on the air pipeline.
5. The system of claim 1, further comprising a control room with a computer control system, a temperature sensor in the hydrothermal reactor, wherein the electromagnetic valves and the temperature sensors in the sections of the pipeline are respectively connected to the computer control system, the sensors for detecting the temperature in the hydrothermal reactor and the temperature of the feed are communicated with the computer control system, and the motor and the circulating pump of the induced draft fan in the system are controlled by the computer control system.
6. A method for sludge drying by using heat release of hydrothermal treatment of high-concentration organic wastewater, which is characterized by being carried out by using the system of any one of claims 1-5, and comprising the following steps:
(1) sending high-concentration organic wastewater and a medicament into a mixer for homogenization treatment, preheating a mixed material by a preheater, sending the mixed material into a high-temperature and high-pressure hydrothermal reactor for hydrothermal oxidation treatment, cooling a product, and then sending the cooled product into a biochemical treatment tank for further treatment;
(2) the heat generated by the hydrothermal reaction is taken away by a circulating heat exchange cooling device to keep the temperature of the hydrothermal reaction constant, and the reacted materials are cooled; part of the heated working medium in the circulating heat exchange cooling device is used for preheating the hydrothermal reaction material, the rest of the working medium flows through the sludge drying bed for drying treatment of the sludge, and the temperature of the working medium which passes through the sludge drying bed and the preheater is reduced and flows back to the water storage tank for continuous cooling heat exchange of the hydrothermal system;
(3) and (3) conveying the dewatered sludge to a sludge drying bed for drying treatment, discharging odor generated in the drying process through a draught fan, and introducing the odor into a biological filter for deodorization treatment.
7. The method for sludge drying by using the heat release of the hydrothermally treated high concentration organic wastewater as claimed in claim 6, wherein the high concentration organic wastewater in step (1) is organic wastewater or landfill leachate with an organic concentration of more than 5% discharged in the production of light industry, chemical industry, food industry, pharmaceutical industry and pesticide industry.
8. The method for sludge drying by using the heat release of the hydrothermally treated high-concentration organic wastewater as claimed in claim 6, wherein the agent added in the hydrothermal oxidation treatment in step (1) is an oxidant, and the oxidant is H2O2、O2Oxygen-enriched air and O3Or one or more of calcium peroxide,the addition amount of the oxidant is 90-120% of the oxygen demand of the organic matters in the completely oxidized wastewater.
9. The method for sludge drying by using the heat release of the hydrothermal treatment of the high-concentration organic wastewater as claimed in claim 6, wherein the hydrothermal reaction conditions in the step (1) are as follows: the temperature is 250-500 ℃, the pressure is 5-30 MPa, and the time is 0.1-10 min.
10. The method for sludge drying by utilizing the heat release of the hydrothermal treatment of the high-concentration organic wastewater as claimed in claim 6, wherein the sludge in the step (3) is municipal sewage plant sludge, municipal water supply sludge, municipal drainage channel sludge, industrial sludge or river and lake sludge.
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