Sludge reduction treatment system

Abstract

The utility model provides a sludge reduction treatment system. The sludge reduction treatment system comprises a primary sedimentation tank, a first ozone reactor, a biochemical system, a secondary sedimentation tank, a coagulative precipitation tank, a second ozone reactor and a pasteurization tank which are communicated in sequence, an inlet of the primary sedimentation tank is connected with a water inlet pipe; the first ozone reactor and the second ozone reactor are respectively connected with a first ozone generator and a second ozone generator; tail gas discharged by the first ozone reactor and the second ozone reactor respectively enters a first tail gas destructor and a second tail gas destructor through gas pipes; the output ends of the first tail gas destructor and the second tail gas destructor are introduced into the ozone micro-nanocrystallization device; the ozone micro-nanocrystallization device is used for discharging a gas-liquid mixture formed by tail gas and sludge into the sludge reduction reactor. According to the system, sludge reduction is finally achieved, intracellular water in the sludge is reduced, the moisture content of the dried sludge is lower than that of the existing sludge, and the equipment cost and the operation energy consumption are reduced in the process.

Description

Technical Field

[0001] This application relates to the field of environmental engineering technology, and particularly to a sludge reduction treatment system. Background Art

[0002] The activated sludge process is the most widely used method for treating domestic sewage. This method belongs to the biochemical treatment method, with low treatment cost, no use of any chemical agents during the treatment process, and is easy to control. However, it will inevitably produce a large amount of excess sludge. The annual discharge of urban sewage in China is about 75 billion m 3 , and the sludge production exceeds 60 million tons.

[0003] Existing sludge treatment methods all have certain limitations, and the excess sludge has a large water content, complex composition and contains refractory organic matter. If not properly treated, it will cause certain secondary pollution to the environment. Therefore, the systematic project of reduction, resource utilization and harmless treatment of excess sludge has always been a hot topic. Among them, the in-situ sludge reduction technology, that is, reducing the generation of sludge from the source, will be an important development trend in the future.

[0004] Currently, sludge reduction technologies mainly include technologies such as cryptic growth, maintenance metabolism, biological predation, and uncoupling metabolism. Chinese Patent - CN101734790B - Method and reactor for ozone-coupled ASBR_SBR nitrogen and phosphorus control sludge reduction in water treatment, Chinese Patent - CN103663893A - Method for realizing sludge reduction of petrochemical wastewater by combining ozone and pure oxygen aeration, and Chinese Patent - CN108101332B - A method and equipment for coupling ultrasonic ozone composite sludge reduction with a Carrousel oxidation ditch respectively developed relative ozone sludge reduction technologies for petrochemical wastewater and processes where the biochemical system is an SBR system and an oxidation ditch. However, in the above patents, it is necessary to reconstruct the ozone preparation unit. The ozone preparation unit prepares ozone by the principle of high-voltage discharge with pure oxygen as the raw material, consuming a large amount of electric energy in the process, and pure oxygen also needs to be obtained by purchasing liquid oxygen or by oneself through an oxygen production device. Although the ozone method also belongs to a better treatment method in sludge reduction technologies, through the above patents, it can be seen that there are problems of low mass transfer efficiency and utilization rate, high investment and operation costs, and inability to be industrialized on a large scale. Summary of the Invention

[0005] In view of the above problems, this application provides a sludge reduction treatment system, which cancels the conventional ozone preparation equipment, reduces the equipment cost and operation energy consumption, and at the same time improves the mass transfer efficiency of ozone by forcing the dispersion of ozone gas through micro-nano aeration technology.

[0006] To achieve the purpose of this application, the following technical solutions are provided in this application:

[0007] A sludge reduction treatment system, comprising: a primary sedimentation tank, a first ozone reactor, a biochemical system, a secondary sedimentation tank, a coagulation sedimentation tank, a second ozone reactor and a Parshall flume, which are connected in sequence;

[0008] The inlet of the primary sedimentation tank is connected to a water inlet pipe;

[0009] The first ozone reactor is further connected to a first ozone generator, the second ozone reactor is further connected to a second ozone generator, and the tail gases discharged from the first ozone reactor and the second ozone reactor enter a first tail gas destructor and a second tail gas destructor respectively through air pipes;

[0010] The output ends of the first tail gas destructor and the second tail gas destructor are introduced into an ozone micro-nano device;

[0011] The ozone micro-nano device is connected to a sludge reduction reactor in sequence, and the ozone micro-nano device is used to discharge a gas-liquid mixture formed by the tail gas and the sludge into the sludge reduction reactor;

[0012] The sludge reduction reactor includes supernatant liquid, sludge sediment and gas.

[0013] Preferably, the supernatant liquid enters the biochemical system through a pipeline and serves as a carbon source substitute.

[0014] Preferably, a sludge drying system is used to treat the sludge sediment discharged from the sludge reduction reactor.

[0015] Preferably, the sludge reduction reactor uses the tail gas as the fluid power.

[0016] Preferably, the ozone micro-nano device is internally provided with a mechanical structure, and the ozone micro-nano device is further used for mixing the tail gas and the sludge and cutting the tail gas.

[0017] Preferably, the secondary sedimentation tank is used to receive the gas that has passed the simple detection and reached the standard.

[0018] Preferably, the sludge reduction treatment system further includes a first cooling unit and a first air separation oxygen production device.

[0019] Preferably, the sludge reduction treatment system further includes a second cooling unit and a second air separation oxygen production device.

[0020] Preferably, the biochemical system is connected to a blower.

[0021] Preferably, the wastewater discharged from the Parshall flume meets the first-class standard, and the COD content is below 50 mg / L.

[0022] Through the sludge reduction treatment system provided by this application, fluid is used as the stirring power, replacing the mechanical stirring in the traditional sludge reduction reactor. It can not only effectively destroy sludge flocs, but also reduce the complexity of the equipment, greatly reducing the maintenance difficulty of the equipment. In addition, the ozone preparation equipment is cancelled, reducing the equipment cost and operation energy consumption. At the same time, the micro-nano aeration technology is used to forcibly disperse ozone gas, improving the mass transfer efficiency of ozone. The overall system finally realizes sludge reduction, reduces the intracellular water in the sludge, and makes the moisture content of the dried sludge lower than the current situation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings are used to provide a further understanding of this application and constitute a part of the specification. Together with the embodiments of this application, they are used to explain this application and do not constitute a limitation to this application.

[0024] Figure 1 It is a schematic flow chart of the sludge reduction treatment system provided by the embodiment of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] To make the objectives, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below with reference to the drawings in this application. Obviously, the described embodiments are some but not all of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without making creative efforts belong to the scope of protection of this application.

[0026] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features; in the description of this application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0027] Embodiment 1

[0028] Figure 1 It is a schematic flow chart of the sludge reduction treatment system provided by the embodiment of this application. This embodiment provides a sludge reduction treatment system, including a primary sedimentation tank, a first ozone reactor, and a biochemical system that are connected in sequence;

[0029] The inlet of the primary sedimentation tank is connected to the water inlet pipe;

[0030] The biochemical system is connected to a blower.

[0031] In a possible implementation manner, the sludge reduction treatment system further includes a secondary sedimentation tank, a coagulation sedimentation tank, a second ozone reactor, and a Parshall flume that are connected to the biochemical system in sequence.

[0032] In a possible implementation manner, the first ozone reactor is further connected to a first ozone generator, and the first ozone generator is connected to a first cooling unit and a first air separation oxygen production device.

[0033] In a possible implementation manner, the second ozone reactor is further connected to a second ozone generator, and the second ozone generator is connected to a second cooling unit and a second air separation oxygen production device.

[0034] In a possible implementation, the first air separation oxygen production equipment and the second air separation oxygen production equipment separate and purify oxygen in the air, and send it to the first ozone generator and the second ozone generator. The first ozone generator and the second ozone generator convert oxygen into ozone through the principle of high-voltage discharge, and send the ozone to the first ozone reactor and the second ozone reactor.

[0035] In a possible implementation, ozone gas and wastewater are introduced into the first ozone reactor and the second ozone reactor for gas-liquid mixing, and pollutants in the water are removed by the strong oxidizing property of ozone. At the same time, the treated wastewater and the remaining tail gas after the reaction are discharged into the biochemical system or the pasteurization tank, and the tail gas destroyer respectively.

[0036] In a possible implementation manner, the tail gas discharged from the first ozone reactor and the second ozone reactor enters the first tail gas destroyer and the second tail gas destroyer respectively through the air pipe.

[0037] In a possible implementation manner, the output ends of the first exhaust gas destroyer and the second exhaust gas destroyer are connected through an exhaust gas pipe, and the exhaust gas pipe leads to the ozone micro-nano device.

[0038] In a possible embodiment, the tail gas discharged from the first ozone reactor and the second ozone reactor contains ozone at a concentration of 10-30 mg / L, which needs to pass through the first tail gas destroyer and the second tail gas destroyer, and the ozone in the tail gas is decomposed into oxygen through high temperature and catalyst before being discharged into the atmosphere.

[0039] In a possible implementation, the tail gas and the sludge are mixed in the ozone micro-nano device, and the ozone micro-nano device cuts the tail gas through an internal mechanical structure to disperse the tail gas in the sludge liquid.

[0040] In a possible implementation, the ozone micro-nano device is sequentially connected to a sludge reduction reactor, and the ozone micro-nano device discharges a gas-liquid mixture formed by tail gas and sludge into the sludge reduction reactor for reaction.

[0041] In a possible implementation, after the reaction in the sludge reduction reactor, supernatant, sludge precipitate and gas are generated and discharged.

[0042] In a possible implementation, the traditional mechanical stirring in the sludge reduction reactor is cancelled, and instead, the tail gas is used as the fluid power for stirring.

[0043] In a possible implementation, the gas after the reaction in the sludge reduction reactor is discharged into the secondary sedimentation tank after passing a simple detection.

[0044] Optionally, ozone with a concentration lower than 10 - 30 mg / L can be used as the reaction gas introduced into the input end of the sludge reduction reactor.

[0045] In a possible implementation, the supernatant is discharged into the biochemical system through a pipeline and serves as a carbon source substitute.

[0046] In a possible implementation, the sludge precipitate is discharged into the traditional sludge drying system.

[0047] In a possible implementation, the advanced ozone oxidation pretreatment technology with the ozone reactor connected to the tail gas destructor is used to open the ring and break the chain of toxic organic substances, improving the biodegradability of the wastewater.

[0048] In a possible implementation, an advanced ozone oxidation deep treatment process is carried out on the biochemical tail water after the reaction in the biochemical system. Through the second ozone reaction, the COD in the water is further removed, making the wastewater discharged from the bar screen reach the first - level standard, with the COD content below 50 mg / L.

[0049] The beneficial effects of adopting the embodiments of the present application are as follows:

[0050] This system does not require ozone preparation equipment, reducing the equipment cost and operation energy consumption; using fluid as the stirring power to replace the mechanical stirring in the traditional sludge reduction reactor can not only effectively destroy the sludge flocs but also reduce the equipment complexity, greatly reducing the equipment maintenance difficulty, and using the supernatant obtained from the reaction in the sludge reduction reactor as the nutrient solution to replace or partially replace the carbon source in the denitrification process of the biochemical system, saving the chemical agent consumption in the sewage treatment plant; and by the micro - nano aeration technology, the ozone gas is forced to disperse, improving the ozone mass transfer efficiency.

[0051] The overall system finally realizes sludge reduction, reduces the intracellular water in the sludge, making the water content of the dried sludge lower than the current situation, greatly reducing the amount of biochemical sludge sent for disposal and saving the sewage treatment plant's external disposal cost.

[0052] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting it. The present application is not limited to the exact structures described above and illustrated in the drawings, and it cannot be determined that the specific implementation of the present application is only limited to these descriptions. For those of ordinary skill in the technical field to which the present application pertains, without departing from the concept of the present application, various changes and modifications made should be regarded as falling within the protection scope of the present application.

Claims

1. A sludge reduction treatment system, characterized in that: include: The primary sedimentation tank, the first ozone reactor, the biochemical system, the secondary sedimentation tank, the coagulation sedimentation tank, the second ozone reactor and the pasteurization tank are connected in sequence; The inlet of the primary sedimentation tank is connected to the water inlet pipe; The first ozone reactor is also connected to the first ozone generator, and the second ozone reactor is also connected to the second ozone generator. The tail gas discharged from the first ozone reactor and the second ozone reactor enters the first tail gas destroyer and the second tail gas destroyer respectively through the air pipe; The output ends of the first tail gas destroyer and the second tail gas destroyer are connected to the ozone micro-nano device; The ozone micro-nano device is connected to the sludge reduction reactor in sequence, and the ozone micro-nano device is used to discharge the gas-liquid mixture formed by tail gas and sludge into the sludge reduction reactor; The sludge reduction reactor contains supernatant, sludge sediment and gas.

2. The sludge reduction treatment system according to claim 1, characterized in that: The supernatant enters the biochemical system through a pipeline as a carbon source substitute.

3. The sludge reduction treatment system according to claim 1, characterized in that: The sludge sediment discharged from the sludge reduction reactor is processed by a sludge drying system.

4. The sludge reduction treatment system according to claim 1, characterized in that: The sludge reduction reactor uses tail gas as fluid power.

5. The sludge reduction treatment system according to claim 1, characterized in that: The ozone micro-nano device has a mechanical structure inside, and the ozone micro-nano device is also used to mix tail gas and sludge, and cut tail gas.

6. The sludge reduction treatment system according to claim 1, characterized in that: The secondary sedimentation tank is used to receive gas that meets the standards after simple testing.

7. The sludge reduction treatment system according to claim 1, characterized in that: The sludge reduction treatment system also includes a first cooling unit and a first air separation oxygen production equipment.

8. The sludge reduction treatment system according to claim 1, characterized in that: The sludge reduction treatment system also includes a second cooling unit and a second air separation oxygen production equipment.

9. The sludge reduction treatment system according to claim 1, characterized in that: The biochemical system is connected to a blower.

10. The sludge reduction treatment system according to claim 1, characterized in that: The wastewater discharged from the pasteurization tank meets the first-class standard, wherein the COD content is below 50 mg / L.

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