Anaerobic reactor for coupling high-concentration sewage with activated sludge

Abstract

The invention discloses a high-concentration sewage and activated sludge coupled anaerobic reactor, high-concentration sewage and activated sludge are subjected to coupled anaerobic treatment, a new way and a new mode for sewage anaerobic treatment and activated sludge anaerobic treatment are created, and coupled anaerobic treatment can reduce investment and operation cost and assist chemical enterprises in carbon emission reduction and carbon resource recovery. The high-concentration sewage coupling activated sludge anaerobic reactor system is simple in structure, adopts modular and device design, can be automatically controlled, and ensures stable operation.

Description

Technical Field

[0001] The invention relates to the field of industrial wastewater and activated sludge treatment, and in particular to a high-concentration sewage-coupled activated sludge anaerobic reactor. Background Art

[0002] Anaerobic digestion technology for sewage is widely used abroad. IC reactors represented by the Netherlands are widely used in China, and the trend is expected to increase in the future. Compared with high-concentration sewage treatment, activated sludge anaerobic digestion treatment is less used abroad, but it is still more than in China, and the success rate of start-up is also higher. There is still room for improvement in technology.

[0003] The domestic sludge anaerobic digestion technology has been used for more than 30 years, and there have been breakthroughs in reactor technology in recent years. The anaerobic digestion technology of sewage is widely used in the fields of PTA sewage, food sewage, beverage sewage, chemical sewage, etc., with UASB technology being the most common, and IC reactor technology introduced from abroad. From the perspective of carbon emission reduction, methanation of organic matter is the future trend, especially in the current era of carbon emission trading.

[0004] In petrochemical enterprises or chemical parks, there are often high-concentration sewage and activated sludge at the same time, but there is no reactor that can couple high-concentration sewage and activated sludge for anaerobic treatment. Treating the two separately increases project investment and operating costs. Therefore, it is urgent to develop a high-concentration sewage coupled activated sludge anaerobic reactor. Summary of the invention

[0005] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a high-concentration sewage coupled activated sludge anaerobic reactor to reduce project investment and operating costs and meet the technical requirements of petrochemical enterprises or park enterprises where high-concentration sewage and activated sludge coexist.

[0006] The technical solution adopted by the present invention is: a high-concentration sewage coupled activated sludge anaerobic reactor, comprising a reactor shell, a mud and water guide cone, a mud and water guide tube, a mud and water reflection cone, a motor, a gearbox, a mud and water lifter, a biogas collection hood, a mud and water injection pipeline, a biogas pipeline, a biogas liquid discharge pipeline, and a biogas residue discharge pipeline; the biogas collection hood is arranged on the top of the reactor shell, the mud and water guide cone, the mud and water guide tube, the mud and water reflection cone, the mud and water lifter gearbox, and the mud and water lifter are arranged inside the reactor shell, and the motor is arranged outside the reactor shell; the motor, the gearbox, the mud and water reflection cone, and the mud and water lifter are connected in sequence, the mud and water guide cone is fixedly connected to the lower side of the mud and water guide tube, and the mud and water reflection cone is arranged above the mud and water guide tube; the biogas pipeline and the biogas liquid discharge pipeline are respectively connected to the reactor shell, and the mud and water injection pipeline and the biogas residue discharge pipeline are arranged at the bottom of the reactor.

[0007] Preferably, the reactor temperature is 25°C-55°C.

[0008] Preferably, the mud and water reflection cone is placed 50mm-300mm above the liquid surface of the reactor.

[0009] Preferably, the biogas collecting hood is more than 10 meters above the ground.

[0010] Preferably, the weight of solids in the reactor accounts for 8% to 12% of the total liquid weight.

[0011] The reactor shell is the place where high-concentration sewage and activated sludge are mixed for anaerobic reaction. The mud water guide cone, mud water guide tube, mud water reflection cone and mud water lifter form a mud water circulation system to ensure that the injected mud water can be fully mixed with the mud water in the reactor to undergo anaerobic reaction and produce biogas. The activated sludge and high-concentration sewage are treated. The mud water reflection cone will reflect the raised circulating mud water, making the mud water form a horizontal flow state to prevent the sludge from crusting on the surface. The motor provides power for the anaerobic reactor mud water circulation lifting, and the motor is connected to the gearbox through the transmission shaft; the biogas collection hood collects the generated biogas and sends it out for use through the biogas pipeline. The biogas collection hood can meet the needs of fluctuations in biogas production and biogas consumption, and adjust the storage capacity of biogas, which is equivalent to the function of a gas cabinet. The space between the biogas collection hood and the reactor liquid surface forms a biogas storage chamber for storing biogas; the high-concentration sewage and activated sludge mixed with muddy water are evenly mixed and injected into the anaerobic reactor through the muddy water injection pipeline for anaerobic reaction to produce biogas, reduce the concentration of organic matter in the biogas liquid, and reduce the proportion of organic matter in the biogas residue. The biogas pipeline is the pipeline for discharging biogas, the biogas liquid discharge pipeline is the pipeline for discharging the supernatant after anaerobic reaction and sedimentation, and the biogas residue discharge pipeline is the solid matter biogas residue with high sediment content and low organic matter ratio at the bottom of the anaerobic reactor out of the anaerobic reactor.

[0012] After the muddy water enters the anaerobic reactor, the motor drives the muddy water lifter to rotate, driving the muddy water upward along the muddy water guide cone and muddy water guide tube. Under the reflection of the muddy water reflection cone, the muddy water flows along the surface of the reactor muddy water liquid to prevent the reactor surface from crusting. Then the muddy water goes down and returns to the muddy water lifter along the pores between the anaerobic reactor shell and the muddy water guide cone, completing the circulation of the muddy water in the anaerobic reactor.

[0013] The beneficial effects of the present invention are as follows:

[0014] (1) The present invention couples high-concentration sewage with activated sludge for anaerobic treatment, creating a new approach and new model for anaerobic treatment of sewage and activated sludge. Anaerobic coupling can reduce investment and operating costs, and help chemical companies reduce carbon emissions and recycle carbon resources.

[0015] (2) The present invention has a simple structure, adopts a modular and device-based design, and can be automatically controlled to ensure the stable operation of the high-concentration sewage-coupled activated sludge anaerobic reactor system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] In the figure: 1. Reactor shell; 2. Mud and water guide cone; 3. Mud and water guide tube; 4. Mud and water reflection cone; 5. Motor; 6. Gearbox; 7. Mud and water lifter; 8. Biogas collection hood; 9. Biogas storage chamber; 10. Mud and water injection pipe; 11. Biogas pipe; 12. Biogas liquid discharge pipe; 13. Biogas residue discharge pipe. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings.

[0019] like Figure 1 As shown, a high-concentration sewage coupled activated sludge anaerobic reactor of the present invention comprises a reactor shell 1, a mud and water guide cone 2, a mud and water guide tube 3, a mud and water reflection cone 4, a motor 5, a gearbox 6, a mud and water lifter 7, a biogas collection hood 8, a mud and water injection pipeline 10, a biogas pipeline 11, a biogas liquid discharge pipeline 12, and a biogas residue discharge pipeline 13; the biogas collection hood 8 is arranged on the top of the reactor shell 1, the mud and water guide cone 2, the mud and water guide tube 3, the mud and water reflection cone 4, the gearbox 5, and the mud and water lifter 6 are arranged inside the reactor shell, and the motor 5 is arranged outside the reactor shell 1; the motor 5, the gearbox 6, the mud and water reflection cone 4, and the mud and water lifter 7 are connected in sequence, the mud and water guide cone 2 is fixedly connected to the lower side of the mud and water guide tube 3, and the mud and water reflection cone 4 is arranged above the mud and water guide tube 3; the biogas pipeline 11 and the biogas liquid discharge pipeline 12 are respectively connected to the reactor shell 1, the mud and water injection pipeline 10 and the biogas residue discharge pipeline 13 are arranged at the bottom of the reactor, and the space between the biogas collection hood 8 and the liquid surface of the reactor forms a biogas storage chamber 9.

[0020] The effective volume of anaerobic digestion in the anaerobic reactor of this embodiment is 3000m 3 , solid content accounts for 8% of the total feed liquid weight, reactor temperature is 37℃; the power of the built-in mud and water lifter is 66kw; the mud and water reflection cone is a household-shaped flow channel, placed 100mm above the reactor liquid surface; the volume of the biogas storage chamber 9 is 530m 3 .

[0021] The biogas collecting hood can be made of biogas-specific membrane materials or steel; the biogas collecting hood is more than 10 meters above the ground and above the liquid level, which has good safety.

[0022] The total amount of activated sludge treated is 4,000t / a, with a moisture content of 30% to 35%; the total amount of high-concentration wastewater is 5,500t / a, with an average COD of about 18,100mg / l. After coupling treatment, the total amount of activated sludge with a moisture content of 92% and high-concentration wastewater slurry is about 125t / d, of which the sludge treatment capacity is about 11t / d, and the high-concentration wastewater is about 15t / d. The organic matter content of the two after mixing is 50%; the biogas production is about 1,820m 3 / d;

[0023] The solid sludge with high sediment content and low organic matter ratio at the bottom of the anaerobic reactor is discharged from the anaerobic reactor through the sludge discharge pipe 13. The sludge discharge pipe 13 is at the bottom of the anaerobic reactor. During the stirring and lifting process, the material is subjected to the centripetal force of the vortex of the lifter 7, and the sediment at the bottom of the anaerobic reactor is collected in the central sand discharge area at the bottom of the reactor, and is regularly discharged out of the tank body through the sand discharge pipe by self-pressure, which completely solves the problem of sediment accumulation and blockage in the anaerobic reactor, and can ensure the long-term stable operation of the anaerobic system without tank cleaning.

[0024] The above is only a typical example of the present invention and does not impose any formal limitation on the present invention. Any technical personnel familiar with the profession, without departing from the scope of the technical solution of the present invention, using the above technical content to make changes or modifications should be regarded as equivalent examples of equivalent changes. Any equivalent changes made to the above examples based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are within the scope of the technical solution of the present invention. Other undescribed parts of the present invention are the same as the prior art. It should be pointed out that for ordinary technical personnel in this technical field, without departing from the principles described in the present invention, several improvements or substitutions can be made, and these improvements or substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A high-concentration sewage coupled activated sludge anaerobic reactor, characterized in that: It includes a reactor shell, a mud and water guide cone, a mud and water guide tube, a mud and water reflection cone, an electric motor, a gearbox, a mud and water lifter, a biogas collection hood, a mud and water injection pipe, a biogas pipe, a biogas liquid discharge pipe, and a biogas residue discharge pipe; the biogas collection hood is arranged on the top of the reactor shell, the mud and water guide cone, the mud and water guide tube, the mud and water reflection cone, the mud and water lifter gearbox, and the mud and water lifter are arranged inside the reactor shell, and the motor is arranged outside the reactor shell; the motor, the gearbox, the mud and water reflection cone, and the mud and water lifter are connected in sequence, the mud and water guide cone is fixedly connected to the lower side of the mud and water guide tube, and the mud and water reflection cone is arranged above the mud and water guide tube; the biogas pipe and the biogas liquid discharge pipe are respectively connected to the reactor shell, and the mud and water injection pipe and the biogas residue discharge pipe are arranged at the bottom of the reactor.

2. The high-concentration sewage coupled activated sludge anaerobic reactor according to claim 1, characterized in that: The reactor temperature was 25°C-55°C.

3. A high-concentration sewage coupled activated sludge anaerobic reactor according to claim 2, characterized in that: The muddy water reflection cone is placed 50mm-300mm above the liquid surface of the reactor.

4. The high-concentration sewage coupled activated sludge anaerobic reactor according to claim 1, characterized in that: The biogas collecting hood is more than 10 meters away from the ground.

5. The high-concentration sewage coupled activated sludge anaerobic reactor according to claim 1, characterized in that: The weight of solids in the reactor accounts for 8% to 12% of the total liquid weight.

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