CN115228283A - A kind of waste gas deodorization treatment method - Google Patents

Abstract

The invention discloses a waste gas deodorization treatment method and provides a waste gas treatment system. The system includes a fan, a collection system, a biological deodorization tower body, a spray system, a biological filler layer, a dosing system, and a distribution system connected in sequence. Gas system, drainage system, water collection system, biological filter. The use of microorganisms to decompose odor does not require too much external energy, and biological reproduction and excretion maintain their own survival and vitality. It can effectively remove odorous substances such as H2S and reduced sulfide in the exhaust gas, with high removal rate, low operating cost, and simple operation and management. It is an ideal purification technology to solve the odorous gas pollution such as H2S and protect the atmospheric environment.

Description

A kind of waste gas deodorization treatment method

technical field

The invention relates to the technical field of waste gas treatment, in particular to a novel deodorization technology for livestock and poultry breeding plants.

Background technique

In recent years, with the rapid development of economy and the improvement of people's living standards, large-scale breeding has become a trend in the development of livestock and poultry breeding industry. However, the excrement and urine discharged from large-scale livestock and poultry farms and the generated ammonia, hydrogen sulfide, skatole, indole, trimethylamine, acrolein and other harmful gases are not conducive to the sustainable development of the livestock and poultry industry, and the stench will destroy animals. Respiratory epithelial cells increase the incidence of respiratory diseases, and the occurrence of typical pneumonia will increase production costs by about 10%. They not only affect the normal growth and production performance of livestock and poultry, but also affect the living environment and even the health of surrounding residents.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a deodorization technical process for livestock and poultry breeding plants, so as to solve the problem of deodorization in breeding plants in the background art.

In order to achieve the above purpose, the present invention provides a process scheme: "spray washing + biological filter" combined process. The biological deodorization process has obvious advantages in terms of operating cost, treatment efficiency, service life, etc. This project adopts it as the main treatment process, using microorganisms to deodorize VOCs substances and conventional odor components ammonia, hydrogen sulfide and odor concentration. degradation treatment. Since the existing water-mist mixed micro-bubble spraying equipment in the current deodorization equipment is similar to the treatment principle of spray washing, it is suggested that the existing water-mist mixed micro-bubble spraying equipment should increase the alkali washing function and increase the biological filter at the back end. pool.

The technical solution is as follows:

A deodorization technology process for livestock and poultry breeding plants, characterized in that the biological deodorization integrated device is the subject link of the deodorization system, including the main body of the deodorization tower, the spray system, the gas distribution system, the drainage system, and also the dosing system. systems and biofilters.

Preferably, in the deodorization technology process of the above-mentioned livestock and poultry breeding plant, the deodorization tower is a modular tower-shaped structure, made of alloy and glass fiber reinforced plastic (FRP), and is a fully enclosed structure, and is equipped with reasonable maintenance holes, air inlets, air outlets, etc.

Preferably, in the deodorization technology process of the above-mentioned livestock and poultry breeding plant, the deodorization tower is divided into four areas: the upper atomization spray system, the middle biological filler filter layer, the lower biological filler support system and the bottom of the Gas system and waste liquid collection system.

Preferably, in the above-mentioned deodorization technical process of livestock and poultry breeding plants, the biological filler filter layer adopts biochar combined filler.

Preferably, in the deodorization technology process of the livestock and poultry breeding plant, the air distribution system is provided with a mesh air distribution grid plate, and a air distribution grid with fine pores is laid on the air distribution system to meet the filling requirements. The odor enters the packing area through the gap between the porous plate and the air distribution grid.

Preferably, in the deodorization technical process of the above-mentioned livestock and poultry breeding plant, the spray part of the deodorization system is mainly composed of a spray water pump, a spray pipe system, an electromagnetic switch system, a metering detection system, a liquid level control system, an automatic water replenishing device, Atomizer sprayer, etc.

Preferably, in the deodorization technical process of the livestock and poultry breeding plant, the power source of the deodorization system is a deodorization fan. Under the pressure provided by the fan, the odor passes through the collection system and enters the deodorization device stably and evenly. The deodorized gas in the device is sucked up and discharged by the fan.

Preferably, in the deodorization technology process of the livestock and poultry breeding plant, the dosing system uses a metering pump to quantitatively add nutrients, the dosing flow is 200L/min, the flow is adjustable, and the dosing pipe is directly connected to the spray The chemical dosing is carried out by the way of the water pump outlet main pipe. The dosing pipe is equipped with a solenoid valve and the dosing pump is controlled by linkage, and starts and stops at the same time, and the diluted medicament is sprayed on the biological area filler through the atomizing sprayer.

The beneficial effects obtained by the present invention are as follows:

(1) The present invention uses the biological deodorization integrated device as the main link of the deodorization system, and the high-concentration odor is purified in this link.

(2) The packing in the deodorization tower designed by this technology adopts the combination of biochar packing, which is in the form of irregular block, and has the characteristics of high porosity, large effective area, good gas and water permeability, and fast mass transfer rate. It is especially suitable for the attachment, growth and reproduction of microorganisms on its surface. In the deodorization tower, the adsorption characteristics of carbon are used to enrich the H2S and organic matter in the odor on the surface of the biochar composite packing, and then through the combined effect of the degradation and filtration of various microorganisms attached to the surface of the packing, it shows efficient purification. ability. The use of biochar combined filler to treat odor not only has stable treatment effect, but also saves land occupation, high efficiency, shock load resistance, simple management and low operating cost, and is suitable for treating odor of various concentrations.

(3) In the dosing process of this technical design, there is no special dosing dilution pump and sprayer, and the dosing pipe is directly connected to the atomizing sprayer and sprayed on the biological area packing to add the medicine. The mixed solution of potassium dihydrogen phosphate, urea and industrial glucose is regularly added to supplement the nitrogen, phosphorus, potassium and other nutrients required for the growth of microorganisms, and maintain the activity of the microorganisms inhabiting the biological filler.

(4) Centrifugal deodorizing fans made of stainless steel are used in the design of this technology. Such fans are suitable for conveying corrosive gases with high moisture content and acid-base properties. Under normal circumstances, the working noise of the centrifugal fan is lower than 85

dB(A), in this design, the vibration isolation and noise prevention efficiency is greater than 80 by setting the base vibration isolation pad and other control measures.

%. The noise of the normal operation of the complete set is less than 70dB. The intake air valve can adjust the suction air volume between 45% and 100% during normal operation of the fan. In addition, there is no gas leakage where the shaft of the centrifugal fan passes through the casing.

This project is an overall deodorization technology process system for livestock and poultry breeding plants, using a biological deodorization integrated device, including the main body of the deodorization tower, spray system, gas distribution system, drainage system, and a dosing system in the process. It has the advantages of no secondary pollution, stable operation and fast processing speed.

Description of drawings

FIG. 1 is a schematic diagram of the process flow diagram of the deodorization technology in a livestock and poultry breeding plant of the present invention.

Among them, 2 is the fan, 6 is the collection system, 9 is the main body of the biological deodorization tower, 17 is the spray system, 26 is the biological packing layer, 30 is the dosing system, 41 is the gas distribution system, 48 is the drainage system, and 53 is the Water collection system, 58 is a biological filter.

Detailed ways

In order to facilitate the understanding of the present invention, the deodorization technical process of the livestock and poultry breeding plant according to the present invention will be described in further detail below with reference to the accompanying drawings. It should be noted here that the descriptions of these embodiments are used to help the understanding of the present invention, but do not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

Fig. 1 shows the schematic diagram of the deodorization technology process system of the livestock and poultry breeding plant according to the present invention, including:

(1) Fan and collection system: The deodorization fan is the power source for the normal operation of the entire deodorization system. Under the pressure provided by the fan, the odor passes through the collection system and enters the biological tower deodorization device stably and evenly.

(2) Deodorization tower and gas distribution system: In the lower part of the deodorization tower, a mesh air distribution grid is set at a height of about 1 meter from the foundation, and a gas distribution grid with fine pores is laid on it to meet the packing accumulation. Require. The odorous gas is fed from the bottom of the tower, and after passing through the gas distribution device, it flows in countercurrent with the liquid and continuously passes through the packing layer through the gap between the porous plate and the gas distribution grid.

(3) Spray tower: The spray liquid of the spray tower is sprayed onto the packing from the top of the tower through the distributor, and flows down along the surface of the packing. On the surface of the packing, the gas and liquid phases are in close contact. First, use spray washing to remove dust particles in the gas, so as not to affect the deodorization effect of the back-end deodorization equipment. On the one hand, the gaseous pollutants are transferred to the liquid-phase liquid membrane to create conditions for the microorganisms to degrade the odor; It can remove part of the grease and solid pollutants in the aerosol. The water pump of the sprinkler system runs intermittently through the time controller. Each water storage tank is equipped with a liquid level controller, and the system can control the start and stop of the water pump through the liquid level in the water storage tank. The selected spray pump model is: Q=60m3/h, H=25m, P=7.5kW. Among them, the spray washing equipment is similar to the existing water-mist mixed micro-bubble spraying equipment in processing principle. Therefore, it is recommended to use the deodorization process as "water mist mixed microbubble injection equipment (alkali washing) + biological filter".

(4) Biological packing layer: The adsorption characteristics of carbon are used in the deodorization tower to enrich the H2S and organic matter in the odor on the surface of the biochar combined packing, and the degradation and filtration of various microorganisms attached to the surface of the biochar combined packing can be carried out. The comprehensive effect of it shows efficient purification ability. The use of biochar combined filler to treat odor not only has stable treatment effect, but also saves land occupation, high efficiency, shock load resistance, simple management and low operating cost, and is suitable for treating odor of various concentrations.

(5) Dosing system: In order to maintain the activity of the microorganisms inhabiting the biological filler, a mixed solution of potassium dihydrogen phosphate, urea, and industrial glucose is regularly added to supplement the nitrogen, phosphorus, potassium and other nutrients required for the growth of microorganisms. , in which potassium dihydrogen phosphate and urea dosing concentration 50mg/L, glucose dosing concentration 40mg/L. Nutrients are dosed quantitatively by a metering pump, the dosing flow is 200L/min, the flow is adjustable, and it is added with the spray humidification process. The selected metering pump model is: Q=200L/min, H=1.2MPa, P=1.5kW. The volume of the matching dosing tank is 500L. In the dosing process, no special dosing dilution pump and sprayer are set up, and the dosing pipe is directly connected to the water outlet main pipe of the spraying pump to add the medicine. The dosing pipe is equipped with a solenoid valve and the dosing pump is controlled by linkage, and starts and stops at the same time, and the diluted medicament is sprayed on the biological area filler through the atomizing sprayer.

(6) Drainage system: After the spray water provided by the spray system is in contact with the filler, it enters the water collection system under the action of gravity flow and is discharged to the biological filter system for further treatment.

(7) Biological filter: use the microorganisms in the biological filter to degrade small molecular substances and conventional odor components ammonia, hydrogen sulfide, methyl mercaptan, trimethylamine, and organic acids. After the treatment is completed, it can be discharged up to the standard .

Although the present invention has been described in detail above with general description, specific embodiments and tests, some modifications or improvements can be made on the basis of the present invention, which is obvious to those skilled in the art . Therefore, these modifications or improvements made without departing from the spirit of the present invention fall within the scope of the claimed protection of the present invention.

Claims (10)

1. The waste gas deodorization treatment method is characterized by comprising a fan (2), a collection system (6), a biological deodorization tower body (9), a spraying system (17), a biological filler layer (26), a dosing system (30), an air distribution system (41), a drainage system (48), a water collection system (53) and a biological filter (58) which are sequentially connected along the waste gas direction.

2. The waste gas deodorization treatment method as claimed in claim 1, wherein the fan (2) is a stainless steel centrifugal fan, the vibration isolation and noise control efficiency is higher than 80% by setting control measures such as a base vibration isolation pad (3), the noise of the complete set of equipment in normal operation is lower than 70dB, the air intake valve (4) adjusts the suction air quantity between 45% and 100% when the fan is in normal operation, and the odor enters the biological deodorization tower body (9) under the pressure provided by the fan through the collection system (6).

3. An exhaust gas deodorization treatment method as recited in claim 1, wherein said biological deodorization tower (9) is a totally enclosed structure and is provided with a manhole (11), an air inlet hole (12), an air outlet hole (13), etc.

4. The method of claim 1, wherein the biological deodorization tower (9) has a single tower wind capacity of 220000m3/h, a single tower footprint of 18m x 10m, and a residence time of 6s.

5. An exhaust gas deodorization processing method as claimed in claim 1, characterized in that said deodorization system spraying system (17) is partially composed of a spraying water pump (18), a spraying pipe system (19), an electromagnetic switch system (20), a metering detection system (21), a liquid level control system (22), an automatic water replenishing device (23), an atomization sprayer (24) and the like.

6. An exhaust gas deodorization method as recited in claim 1, wherein said water pump (18) of the spray system of the deodorization system spray system (17) is intermittently operated by a time controller (25), and 1 liquid level controller (22) is respectively disposed in the water storage tank, and the system can control the start and stop of the water pump by the liquid level in the water storage tank.

7. The waste gas deodorization treatment method as claimed in claim 1, wherein the bio-filler layer (26) is a bio-carbon combined filler having characteristics of high porosity, large effective area, good permeability of gas and water, and fast mass transfer rate.

8. The waste gas deodorization treatment method as claimed in claim 1, wherein the dosing system (30) uses a metering pump (32) to dose the nutrient, and the dosing is performed by directly connecting a dosing pipe (35) to a water outlet main pipe of the spray water pump (18). The dosing pipe is provided with an electromagnetic valve (36) and a dosing pump (37) which are in linkage control, and the dosing pipe is started and stopped simultaneously, and diluted medicament is sprayed on the biological region filler (26) through an atomization sprayer (24).

9. An exhaust gas deodorization treatment method as recited in claim 1, wherein said air distribution system (41) is provided with a net-shaped air distribution grid plate (43) at the lower end of the deodorization tower, and an air distribution grid (44) with fine pores is laid on the net-shaped air distribution grid plate to meet the packing requirement. The odor enters the filling area through the gap between the porous plate and the air distribution grid.

10. An exhaust gas deodorization treatment method as claimed in claim 1, wherein the drainage system (48) is formed by spraying water provided by the spraying system (17) to contact with the packing (26), and then entering the water collection system (50) under gravity flow to be integrated into the biological filter (58) for sewage treatment.

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