CN201545773U - Integrated organic sludge high-temperature micro-aerobic horizontal digestion reactor - Google Patents

Abstract

The utility model relates to an integrated organic sludge high-temperature micro-aerobic horizontal digestion reactor, which comprises a reactor body, a control system, a stirring system and an aeration system arranged at the bottom of the reactor. Inlet, outlet and vent, the reactor body is provided with at least three baffles, and the baffles divide the reactor body into a feed area, at least two reaction areas and a discharge area in turn. The feed area communicates with the reaction area, and the discharge area communicates with the bottom of the reaction area; the reaction area communicates with the upper part of the reaction area; and each reaction area is equipped with a double-layer blade combined agitator. The utility model degrades volatile organic matter through the joint action of aerobic bacteria, facultative bacteria and anaerobic bacteria, and transforms them into high-quality, safe and reliable bio-organic fertilizers. The reactor has compact structure, simple operation, and adopts underground or semi placed in a buried manner.

Description

Integrated organic sludge high-temperature micro-aerobic horizontal digestion reactor

technical field

The utility model belongs to sewage biological treatment technology, and relates to a high-temperature micro-aerobic digestion reactor, which is suitable for liquid organic solid waste with a solid content of 4-20% and a volatile organic solid concentration of 90%-40%, such as Municipal sludge, organic waste discharged from poultry breeding plants, kitchen waste, livestock manure and other liquid organic matter.

Background technique

With the development of social economy and urbanization in our country, the amount of urban sewage is constantly increasing. It is predicted that in 2010 China's urban sewage discharge will reach 44 billion m ³ /d; in 2020 it will reach 53.6 billion m ³ /d. Although my country's sewage treatment capacity and treatment rate are not high at present, urban sewage treatment plants discharge about 300,000 tons of dry sludge every year, and it is also growing at a rate of 10% per year. In our country's existing sewage treatment plants, a large part of the sludge treatment facilities have not been effectively operated, and the sludge has not been properly treated, resulting in the final problem of urban sewage treatment falling on the sludge treatment. Therefore, how to effectively treat sewage plant sludge is the most important and complex problem faced in the field of sewage (waste) water treatment in the international scope.

Contents of the invention

In view of the above problems, the utility model provides an integrated organic sludge high-temperature micro-aerobic horizontal digestion reactor, through the joint action of aerobic bacteria, facultative bacteria and anaerobic bacteria, volatile organic compounds are degraded and transformed into high-quality , safe and reliable bio-organic fertilizer, the reactor has a compact structure, simple operation, and is placed in a buried or semi-buried way to beautify the environment.

The technical scheme adopted by the utility model to achieve the above purpose is as follows: an integrated organic sludge high-temperature micro-aerobic horizontal digestion reactor, including a reactor body, a control system, a stirring system and an aeration system arranged at the bottom of the reactor, The reactor body is provided with a feed inlet, a feed outlet and a vent, and at least three baffles are arranged in the reactor body, and the baffles divide the reactor body into a feed area, at least two The reaction area and the discharge area, the feed area communicates with the reaction area, the discharge area communicates with the bottom of the reaction area; the reaction area communicates with the upper part of the reaction area; mixer.

The utility model is a single-stage high-temperature micro-aerobic digestion reactor for organic sludge, which uses thermophilic bacteria existing in nature to carry out stirring and mixing reactions under high temperature conditions of 50-60°C, and provides aeration at the same time to efficiently remove organic sludge. Harmful substances and organic matter in sludge are converted into high-quality, pathogen-free bio-organic fertilizers, which can be safely used in agriculture.

The utility model is suitable for liquid organic solid wastes with a solid content of 4-20% and a volatile organic solid concentration of 90%-40%, such as urban sludge, organic waste discharged from poultry breeding factories, kitchen waste, livestock Liquid organic matter such as feces. Due to the high concentration, high viscosity and high oxygen demand of the sludge put into the reactor, and the limited amount of oxygen entering the reactor through mass transfer, it is not completely aerobic, but a micro-aerobic state, that is, through aerobic bacteria, The joint action of facultative bacteria and anaerobic bacteria degrades volatile organic compounds, and finally obtains stable, harmless organic solids that can be used as fertilizers, which solves the problem of the final outlet of organic sludge.

The utility model belongs to a single-stage reactor, but according to the residence time, there are two or more than two reaction zones inside, and the structure is compact, the operation is simple, and the floor area is small; and each reaction zone is equipped with a double-layer blade Combined agitator, through the agitation of the agitator, it can mix without dead angle, achieve the effect of sludge suspension, and promote the absorption of organic matter and oxygen by microorganisms; it can also fully disperse the gas through the shear force generated by the agitation, and break up large bubbles , make the gas-liquid homogeneous, prolong the gas-liquid contact time, improve the mass transfer efficiency of oxygen, and complete the gas-liquid mass transfer process, so as to ensure the complete oxidation reaction of microorganisms, release enough heat, and ensure the high temperature state of the reactor.

According to the actual situation, the utility model adopts the way of buried or semi-buried to install the reactor, which not only can reduce the loss of heat, but also can reduce the occupied area.

As a preferred embodiment of the present utility model: the upper blades of the combined agitator are radial-flow turbine blades, and the lower blades are axial-flow propeller blades. Radial flow blades are used for gas dispersion; axial flow blades are beneficial to gas dispersion due to their strong circulation capacity and large discharge volume, and are also very effective for the suspension of solid particles; when there are poorly dispersed and condensed air bubbles at the bottom After entering the upper area, it can be dispersed and broken up again by the turbine blades with high shear force, prolonging the gas phase residence time, improving the oxygen mass transfer efficiency, and increasing the gas-liquid mass transfer specific surface area.

The size of the impeller affects the discharge flow and power consumption of the impeller. Due to the high concentration of sludge, high viscosity and poor fluidity in the reactor of the utility model, if the radius of the blade is too small, it is easy to cause a "cylindrical turning zone"; Light components are concentrated near the shaft of the agitator, resulting in uneven distribution of gas, liquid, and solid. According to theoretical deduction and calculation, in the combined agitator involved in this reactor, the length of the blade and the narrowest point of the reaction zone The width ratio is selected between 0.30-0.60.

In the utility model, the blades of the combined agitator are at an angle of 40°-60° to the direction of motion; after adopting the above-mentioned structural design, it can not only increase the discharge volume and improve the power efficiency; when the impeller moves, In addition to the effect of horizontal circulation, it can also generate axial shunt effect.

In order to make the reactor structure more beautiful and more suitable for actual use, the reactor adopts a horizontal cuboid structure, and the ratio of its length to width is 2-4:1.

In order to ensure that the reactor is not affected by the external air temperature and has less heat dissipation, an insulation layer is provided on the periphery of the reactor body.

As a further improvement of the utility model: the aeration system includes an aeration pipe, an aeration head, and a pressure gauge; the aeration pipe is arranged at the bottom of the reactor body; the aeration head is evenly distributed on the aeration pipe and communicate with the aeration pipe. Among them, the aeration head can provide tiny bubbles to increase the contact area and contact time of the gas-liquid phase. The number of aeration heads is related to its service area; the pressure gauge can monitor whether the aeration head is blocked, so as to unblock it in time. In the early stage of the reaction of the utility model, the organic sludge needs more oxygen and the aeration rate needs to be increased; in the later stage of the reaction, the organic sludge needs less oxygen and the aeration rate needs less. A flow meter can also be added to the aeration system of the reactor to adjust the flow of the aeration pipe.

As a further improvement of the utility model: the utility model can be provided with a defoaming system, the defoaming system includes an air defoaming pipe, a foam shear and an injection port; the air defoaming pipe is arranged on the upper part of the reactor body , small holes are evenly opened on the pipe wall; the foam shearer and injection port are connected to the top of the reactor body. When the defoaming system is working, the gas blown out through the small holes on the wall of the air defoaming pipe breaks the foam; the injection port can spray the defoamer, and the defoamer is sprayed into the reactor and evenly distributed by the agitator It acts as a defoamer on the entire liquid surface.

The distance between the lower blades of the combined agitator described in the utility model and the bottom aeration pipe is 0.2-0.5 times the blade length.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1 reactor body, 1-1 feed port, 1-2 discharge port, 1-3 vent port, 1-4 feed area, 1-5 reaction area I, 1-6 reaction area II, 1 -7 discharge area, 1-8 temperature measuring hole; 2 aeration system, 2-1 aeration pipe, 2-2 aeration head, 2-3 pressure gauge; 3 baffle; 4 double-layer blade combined agitator , 4-1 upper blade, 4-2 lower blade; 5 insulation layer; 6 defoaming system, 6-1 air defoaming pipe, 6-2 foam shear, 6-3 injection port.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described further.

As shown in Figure 1: the utility model relates to an integrated organic sludge high-temperature micro-aerobic horizontal digestion reactor, including a reactor body 1, a control system, a stirring system, an aeration system 2 arranged at the bottom of the reactor and The defoaming system 6 arranged on the upper part of the reactor; wherein: the middle part of the main structure of the reactor body 1 is a horizontal cuboid structure, and the ratio of its length to width is 3:1; the reactor body 1 is provided with a feed port 1-1, discharge port 1-2, vent port 1-3 and temperature measuring hole 1-8; the periphery of the reactor body is provided with an insulation layer 5, and there are three vertically placed baffles 3 inside, and three baffles The plate divides the reactor body 1 into feed zone 1-4, reaction zone I1-5, reaction zone II1-6 and discharge zone 1-7, feed zone 1-4 and reaction zone I, reaction zone II and The bottoms of the discharge areas 1-7 are communicated, and the baffles between them are respectively connected to the upper end of the reactor body 1; the reaction zone I is communicated with the upper part of the reaction zone II, and the baffles between them are connected to the bottom of the reactor body 1; A double-layer blade combined agitator 4 is respectively installed in the reaction zone I and the reaction zone II; the aeration system 2 includes an aeration pipe 2-1, an aeration head 2-2, a pressure gauge 2-3 and a flow meter, etc. The aeration pipe 2-1 is arranged at the bottom of the reactor body 1; the aeration head 2-2 is evenly distributed on the aeration pipe 2-1 and communicated with it, and the aeration head 2-2 can provide tiny air bubbles to increase the air The contact area and contact time of the liquid phase are related to their service area; the pressure gauge 2-3 is arranged on the pipe outside the reactor, which can monitor whether the aeration head is blocked, so as to unblock it in time; and the double-layer blade combined type The distance between the lower blade 4-2 of the agitator 4 and the bottom aeration pipe 2-1 is 0.4 times the length of the blade.

The defoaming system 6 is composed of an air defoaming pipe 6-1, a foam shearer 6-2, and an injection port 6-3; the air defoaming pipe 6-1 is a curved pipe with small holes evenly opened on the pipe wall, The gas blown out of the small hole can gather the foam at the foam shearer 6-2, which is convenient for the defoaming of the shearer; the air defoaming pipe 6-1 is placed horizontally on the upper part of the reactor, and the height is set at 30-50cm from the liquid surface The injection port 6-3 can spray the defoamer, the defoamer is sprayed into the reactor, and is evenly distributed on the entire liquid surface by the stirring of the agitator; the foam shearer 6-2 can cut the foam through physical shearing. Breaking, the rotating speed is 10-50rpm.

In this device: the double-layer blade combined agitator 4 is specifically composed of upper and lower two-layer stirring blades, the upper layer is a radial flow type turbine blade 4-1, and the lower layer is an axial flow type propulsion type blade 4-2, and The agitator blade and the reaction zone width ratio are 0.30; the agitator blade root and the direction of motion are at an angle of 45°, and the operating speed of the agitator 4 is related to the gas flow and the sludge concentration; Fast, can reach 50-130rpm, the stirring speed of reaction zone II is relatively slow, specifically 50-100rpm; the purpose of fast stirring in reaction zone I is to mix the incoming organic sludge with the feed liquid in the reactor as soon as possible, and also to Break up the large pieces of sludge brought in, so that the sludge and oxygen are fully mixed.

The utility model takes the semi-intermittent operation mode as an example, that is, discharges and feeds once or several times a day to illustrate the working process of the whole reactor: firstly, the discharge port is opened to discharge a certain amount of sludge, and then the discharge port is closed, organically Sludge enters the feed area from the feed port, and the baffle prevents the impact; then enters the reactor I, through stirring and aeration, the organic matter is degraded, and heat is released at the same time, and the reaction area I plays a buffer role on the entering normal temperature sludge , so as not to lower the temperature of the entire reactor; the sludge from reactor I passes through the baffle to the reaction zone II to continue the exothermic reaction. At this time, the temperature of the reactor can reach a high level, and the pathogenic bacteria are inactivated. area, and finally discharge from the discharge port. The two reaction zones set in the reactor not only serve as a series connection of two-stage reactors, but also save materials and floor space. Due to the heat preservation measures and the heat released by the aerobic reaction, the reactor can reach a high temperature of 45-65 ° C, which improves the rate of the enzymatic reaction and shortens the processing time, and the device has a good heat preservation effect and is not affected by the external temperature , even in winter can still maintain a high temperature state.

The device is compact in structure and easy to operate. Through the joint action of aerobic bacteria, facultative bacteria and anaerobic bacteria, organic matter is degraded and transformed into high-quality, safe and reliable bio-organic fertilizer, which effectively utilizes a large amount of organic waste contained in organic waste. Biomass energy is of great significance to the sustainable development of the environment and economy.

Claims (10)

1. An integrated organic sludge high-temperature micro-aerobic horizontal digestion reactor, including a reactor body, a control system, a stirring system and an aeration system arranged at the bottom of the reactor. The reactor body is provided with a feed port, The discharge port and the vent are characterized in that: the reactor body is provided with at least three baffles, and the baffles divide the reactor body into a feed area, at least two reaction areas and a discharge area in sequence. The feed area communicates with the reaction area, and the discharge area communicates with the bottom of the reaction area; the reaction area communicates with the upper part of the reaction area; and each reaction area is equipped with a double-layer blade combined agitator. 2. The integrated organic sludge high-temperature micro-aerobic horizontal digestion reactor according to claim 1, characterized in that: the upper blade of the combined agitator is a radial-flow turbine blade, and the lower blade is an axial flow type propeller blades. 3. The integrated organic sludge high-temperature micro-aerobic horizontal digestion reactor according to claim 1 or 2, characterized in that: the ratio of the diameter of the rotating circle of the combined agitator blade to the width of the narrowest part of the reaction zone 0.30-0.60. 4. The integrated organic sludge high-temperature micro-aerobic horizontal digestion reactor according to claim 1 or 2, characterized in that: the blades of the combined agitator form an angle of 40°-60° with the direction of motion. 5. The integrated organic sludge high-temperature micro-aerobic horizontal digestion reactor according to claim 1, characterized in that: the main body of the reactor body is a horizontal cuboid structure, and the ratio of its length to width is 2-4 : 1. 6. The integrated organic sludge high-temperature micro-aerobic horizontal digestion reactor according to claim 1 or 5, characterized in that: the periphery of the reactor body is provided with an insulation layer. 7. The integrated organic sludge high-temperature micro-aerobic horizontal digestion reactor according to claim 1, characterized in that: the aeration system includes an aeration pipe, an aeration head, and a pressure gauge; The tubes are arranged at the bottom of the reactor body; the aeration heads are evenly distributed on the aeration tubes and communicated with the aeration tubes. 8. The integrated organic sludge high-temperature micro-aerobic horizontal digestion reactor according to claim 1 or 7, characterized in that: a defoaming system is also provided, and the defoaming system includes an air defoaming pipe, a foam shear The air defoaming pipe is arranged on the upper part of the reactor body, and small holes are evenly opened on the pipe wall; the foam shearer and the injection port are assembled on the top of the reactor body. 9. The integrated organic sludge high-temperature micro-aerobic horizontal digestion reactor according to claim 7, characterized in that: the distance between the lower blade of the combined agitator and the bottom aeration tube is 0.2-0.5 Double leaf length. 10. The integrated organic sludge high-temperature micro-aerobic horizontal digestion reactor according to claim 1, characterized in that: the reactor body is provided with three baffles, and the three baffles divide the reactor body sequentially. It is the feed zone, reaction zone I, reaction zone II and discharge zone.

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