A method for treating waste gas for environmental engineering

Abstract

The invention discloses a waste gas treatment method for environmental engineering, which relates to the technical field of waste gas treatment and comprises the following steps: waste gas collection, waste gas detection, and evaluating the pollutant concentration through a waste gas detection algorithm to obtain a pollutant index, judging whether waste gas pretreatment is needed according to the pollutant index, waste gas pretreatment, pretreatment evaluation, using a pretreatment evaluation algorithm to quantitatively evaluate the waste gas pretreatment effect to obtain a pretreatment score, waste gas main treatment, main treatment evaluation, using a main treatment evaluation algorithm to quantitatively evaluate the waste gas main treatment effect to obtain a main treatment score, and having the ability to judge whether pretreatment is needed according to the pollutant index, and adjusting the treatment process according to the waste gas situation to improve efficiency, and realizing quantitative evaluation of the waste gas treatment effect by setting the scoring thresholds of the pretreatment and the main treatment, so as to help managers quickly understand the waste gas treatment status, reduce emission deviations, and reduce environmental risks.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment, in particular to a waste gas treatment method for environmental engineering. Background Art

[0002] Waste gas refers to toxic and harmful gases discharged by humans in the process of production and life, especially the waste gas produced by chemical plants, steel mills, pharmaceutical plants, coking plants, refineries, etc. and human life. Waste gas contains many types of pollutants, their physical and chemical properties are very complex, and their toxicity is also different.

[0003] The exhaust gas emitted from fuel combustion contains sulfur dioxide, nitrogen oxides, etc. The exhaust gas has a strong odor, seriously polluting the environment and affecting human health, so the exhaust gas needs to be treated.

[0004] At present, in the waste gas treatment process, pretreatment is usually carried out directly after the waste gas is collected. There is a lack of detection and evaluation of the overall pollutant concentration of the waste gas, and it is difficult to adjust the treatment process according to the actual situation of the waste gas, thereby increasing the burden of subsequent treatment and reducing the waste gas treatment efficiency. In addition, there is a lack of quantitative evaluation of the effects of waste gas pretreatment and main treatment, and the emission of waste gas is prone to deviations, which increases environmental risks. Summary of the invention

[0005] The purpose of the present invention is to provide a waste gas treatment method for environmental engineering, which solves the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for treating waste gas for environmental engineering, comprising the following steps:

[0007] Waste gas collection: set up an exhaust hood at the waste gas source, and use an exhaust fan to suck the waste gas into the gas pipeline. Establish a sensor system to monitor the data during the waste gas treatment process in real time;

[0008] Exhaust gas detection: use the sensor system to detect pollutant data in the exhaust gas, and evaluate the pollutant concentration through the exhaust gas detection algorithm to obtain the pollutant index R, and set the processing threshold Z of the pollutant index R. When the pollutant index R is greater than the processing threshold Z, the exhaust gas pre-treatment is carried out, otherwise the exhaust gas main treatment is carried out directly;

[0009] Exhaust gas pretreatment: After the exhaust gas is transported to the pretreatment equipment, a filter is first used to reduce the concentration of particulate matter in the exhaust gas, then a dehumidification device is used to reduce the exhaust gas humidity, and finally a temperature control device is used to control the exhaust gas temperature to the target temperature;

[0010] Pretreatment evaluation: use the pretreatment evaluation algorithm to quantitatively evaluate the exhaust gas pretreatment effect, obtain the pretreatment score S, and set a minimum threshold value Y1 for the pretreatment score S. When S is less than the minimum threshold value Y1, the exhaust gas is transported to the pretreatment equipment again for treatment until it meets the requirements, and then the exhaust gas is transported to the main treatment equipment;

[0011] The main waste gas treatment is to introduce the waste gas into the scrubber to contact with the absorption liquid, and the acid gas is removed by chemical reaction. The waste gas is then passed through a filter layer filled with microorganisms to decompose organic pollutants in the waste gas by using microorganisms. The waste gas is then passed through a photocatalytic oxidation device to oxidize and decompose pollutants by using catalysts under ultraviolet light.

[0012] Main treatment evaluation: use the main treatment evaluation algorithm to quantitatively evaluate the main treatment effect of the exhaust gas, obtain the main treatment score P, set the emission threshold Y2 of the main treatment score P, and when the main treatment score P is greater than the emission threshold Y2, the exhaust gas after the main treatment can be discharged, otherwise the main treatment is performed again.

[0013] Optionally, the exhaust gas detection algorithm process in the exhaust gas detection step is as follows:

[0014] ;

[0015] Where R is the pollutant index;

[0016] D so2 is the sulfur dioxide concentration, D so2，bj is the standard sulfur dioxide concentration;

[0017] D NOx is the concentration of nitrogen oxides, D NOx,bj is the standard nitrogen oxide concentration;

[0018] C is the particle concentration, C bj is the standard particle concentration;

[0019] The larger the pollutant index R is, the higher the pollutant concentration in the environment is, and vice versa. A processing threshold Z of the pollutant index R is set. When the pollutant index R is greater than the processing threshold Z, exhaust gas pretreatment is performed, otherwise the exhaust gas main treatment is performed directly.

[0020] Optionally, the preprocessing evaluation algorithm process in the preprocessing evaluation step is as follows:

[0021] ;

[0022] Where S is the pre-processing score;

[0023] C out is the inlet particle concentration;

[0024] Cin is the outlet particulate matter concentration;

[0025] W1 is the particle concentration influence coefficient, which is 0.4;

[0026] H out is the outlet humidity, H in is the inlet humidity;

[0027] W2 is the humidity influence coefficient, which is 0.3;

[0028] T out is the outlet temperature, T tar is the standard temperature;

[0029] T ran is the temperature fluctuation value;

[0030] W3 is the temperature influence coefficient, which is 0.3;

[0031] The larger the pretreatment score S is, the better the effect of exhaust gas pretreatment is, and vice versa. The minimum threshold of pretreatment score S is set to Y1, and the value of Y1 is 0.8. When the pretreatment score S is less than Y1, the exhaust gas is pretreated again until it meets the requirements and enters the main treatment stage.

[0032] Optionally, the main processing evaluation algorithm in the main processing evaluation process is as follows:

[0033] ;

[0034] in is the primary treatment score;

[0035] S is the pretreatment score;

[0036] Q in is the inlet acid gas concentration, Q out is the outlet acid gas concentration;

[0037] M1 is the acid gas treatment coefficient, which is 0.4;

[0038] is the inlet organic pollutant concentration;

[0039] is the outlet organic pollutant concentration;

[0040] M2 is the treatment coefficient of organic pollutant concentration, which is 0.3;

[0041] G in is the pollutant concentration before oxidation;

[0042] G out is the pollutant concentration after oxidation;

[0043] M3 is the oxidation treatment coefficient, which is 0.3;

[0044] The main treatment score P represents the main treatment effect of the exhaust gas. The larger the main treatment score P is, the better the main treatment effect of the exhaust gas is, and vice versa. When the exhaust gas pretreatment is not performed, the pretreatment score S defaults to 1, and the emission threshold Y2 of the main treatment score P is set. When the main treatment score P is greater than the emission threshold Y2, the exhaust gas after the main treatment can be discharged. When the main treatment score P is less than the emission threshold Y2, the main treatment is performed again.

[0045] Optionally, when the main processing score P is less than the emission threshold value Y2, the humidity influence coefficient W2 and the temperature influence coefficient W3 in the pre-processing evaluation algorithm are increased, and the particle concentration influence coefficient W1 is reduced to ensure that W1+W2+W3=1, specifically:

[0046] ;

[0047] ;

[0048] ;

[0049] NW1 is the new particle concentration influence coefficient, NW2 is the new humidity influence coefficient, and NW3 is the new temperature influence coefficient;

[0050] X is the adjustment amount, ranging from 0.05 to 0.1;

[0051] When the main treatment score P is less than the emission threshold Y2, W1, W2 and W3 are adjusted to obtain NW1, NW2 and NW3, and brought into the pretreatment evaluation algorithm to increase the influence of subsequent exhaust gas temperature and humidity in the exhaust gas pretreatment process, so that the exhaust gas treatment effect can be adjusted according to its actual situation, thereby improving the flexibility of exhaust gas treatment.

[0052] Optionally, in the main waste gas treatment step, a packing layer is provided in the washing tower to increase the gas-liquid contact time, and the absorption liquid after the chemical reaction with the waste gas is transported to the liquid treatment system.

[0053] Optionally, in the main exhaust gas treatment step, nutrients are regularly added to the filter material layer filled with microorganisms, and the photocatalytic oxidation device is regularly cleaned.

[0054] Optionally, a distributor is provided on the top of the packing layer, and the packing layer adopts Raschig ring packing.

[0055] Compared with the prior art, the present invention has the following beneficial effects:

[0056] 1. The present invention detects the exhaust gas pollutant index R and quantitatively evaluates the results, so that management personnel can quickly understand the pollution situation of the currently collected exhaust gas. The larger the pollutant index R, the greater the harm of the current exhaust gas to the environment, and the need to strengthen the treatment operation. Therefore, it is necessary to pre-treat the exhaust gas first. Conversely, it means that the current exhaust gas is less harmful to the environment, and only pre-treatment is needed to meet the emission requirements. By adjusting the treatment process according to the actual situation of the exhaust gas, time can be saved and the exhaust gas treatment efficiency can be improved.

[0057] 2. When pretreatment is required, the present invention uses a pretreatment evaluation algorithm to quantitatively evaluate the effect of waste gas pretreatment to obtain a pretreatment score S, and sets a minimum threshold value Y1 for the pretreatment score S. The decision on whether to enter the main treatment is made based on the comparison between the pretreatment score S and the minimum threshold value Y1 to ensure the quality of pretreatment. The main treatment score P is then obtained through the main treatment evaluation algorithm, wherein the pretreatment score S will affect the main treatment score P, and by setting an emission threshold value Y2 of the main treatment score P, when the main treatment score P is greater than the emission threshold value Y2, the waste gas after the main treatment can be discharged, otherwise the main treatment is performed again to ensure that the discharged waste gas meets environmental protection requirements. The pretreatment score S and the main treatment score P are used to achieve a quantitative evaluation of the waste gas pretreatment and main treatment effects, so that management personnel can quickly and comprehensively understand the waste gas treatment situation, reduce emission deviations, and reduce environmental risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 The figure is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Embodiment 1:

[0060] See also Figure 1 This embodiment provides a method for treating waste gas for environmental engineering, comprising the following steps:

[0061] Waste gas collection: set up an exhaust hood at the waste gas source, and use an exhaust fan to suck the waste gas into the gas pipeline. Establish a sensor system to monitor the data during the waste gas treatment process in real time;

[0062] Exhaust gas detection: use the sensor system to detect pollutant data in the exhaust gas, and evaluate the pollutant concentration through the exhaust gas detection algorithm to obtain the pollutant index R, and set the processing threshold Z of the pollutant index R. When the pollutant index R is greater than the processing threshold Z, the exhaust gas pre-treatment is carried out, otherwise the exhaust gas main treatment is carried out directly;

[0063] Exhaust gas pretreatment: After the exhaust gas is transported to the pretreatment equipment, a filter is first used to reduce the concentration of particulate matter in the exhaust gas, then a dehumidification device is used to reduce the exhaust gas humidity, and finally a temperature control device is used to control the exhaust gas temperature to the target temperature;

[0064] Pretreatment evaluation: use the pretreatment evaluation algorithm to quantitatively evaluate the exhaust gas pretreatment effect, obtain the pretreatment score S, and set a minimum threshold value Y1 for the pretreatment score S. When S is less than the minimum threshold value Y1, the exhaust gas is transported to the pretreatment equipment again for treatment until it meets the requirements, and then the exhaust gas is transported to the main treatment equipment;

[0065] The main waste gas treatment is to introduce the waste gas into the scrubber, contact it with the absorption liquid, and remove the acid gas through chemical reaction. Then the waste gas passes through the filter layer filled with microorganisms to decompose the organic pollutants in the waste gas. Then the waste gas passes through the photocatalytic oxidation device and uses the catalyst to oxidize and decompose the pollutants under ultraviolet light.

[0066] Specifically, a packing layer is provided in the washing tower to increase the contact time between gas and liquid. A distributor is provided on the top of the packing layer. The packing layer adopts Raschig ring packing to transport the absorption liquid after chemical reaction with the exhaust gas to the liquid treatment system. By providing the packing layer, the contact efficiency between gas and liquid can be improved when the exhaust gas passes through. The Raschig ring packing has a large specific surface area, which helps to evenly distribute the absorption liquid in the packing layer and reduces the channel flow and wall flow. The distributor can ensure that the liquid is evenly distributed above the packing layer to prevent local overload. At the same time, it can reduce the droplets being carried out of the tower by the exhaust gas flow, thereby improving the treatment efficiency of the washing tower.

[0067] Main treatment evaluation: use the main treatment evaluation algorithm to quantitatively evaluate the main treatment effect of the exhaust gas, obtain the main treatment score P, set the emission threshold Y2 of the main treatment score P, and when the main treatment score P is greater than the emission threshold Y2, the exhaust gas after the main treatment can be discharged, otherwise the main treatment is performed again.

[0068] More specifically, in this embodiment: after collecting the exhaust gas, the pollutant concentration is evaluated by the exhaust gas detection algorithm to obtain the pollutant index R. The pollutant index R can be used to quantitatively evaluate the current exhaust gas pollution level, so that the management personnel can quickly and comprehensively understand the pollution level, and set the processing threshold Z of the pollutant index R. When the pollutant index R is greater than the processing threshold Z, the exhaust gas is pretreated. When the pollutant index R is less than the processing threshold Z, it means that the current exhaust gas pollutant concentration is low and no pretreatment is required. The main exhaust gas treatment can be carried out directly. The treatment process is adjusted according to the actual exhaust gas situation, thereby saving time and improving the exhaust gas treatment efficiency. When pretreatment is required, the exhaust gas pretreatment effect is quantitatively evaluated by the pretreatment evaluation algorithm to obtain the pretreatment score S. The effect of the exhaust gas pretreatment affects the subsequent exhaust gas pretreatment. The pretreatment score S can help the management personnel quickly understand the pretreatment effect, and set the minimum threshold Y1 of the pretreatment score S. The decision whether to enter the main treatment is made based on the comparison between the pretreatment score S and the minimum threshold Y1, thereby ensuring the quality of pretreatment.

[0069] After pretreatment, the waste gas enters the main treatment link. The main treatment evaluation algorithm is used to quantitatively evaluate the main treatment effect of the waste gas to obtain the main treatment score P, which is convenient for understanding the main treatment of the waste gas. The emission threshold Y2 of the main treatment score P is set. When the main treatment score P is greater than the emission threshold Y2, the waste gas after the main treatment can be discharged. Otherwise, the main treatment is carried out again to ensure the quality of the main treatment, reduce emission deviations, and reduce environmental risks.

[0070] Furthermore, the exhaust gas detection algorithm process in the exhaust gas detection step is as follows:

[0071] ;

[0072] Where R is the pollutant index;

[0073] D so2 is the sulfur dioxide concentration, D so2，bj is the standard sulfur dioxide concentration;

[0074] D NOx is the concentration of nitrogen oxides, D NOx,bj is the standard nitrogen oxide concentration;

[0075] C is the particle concentration, C bj is the standard particle concentration;

[0076] The larger the pollutant index R is, the higher the pollutant concentration in the environment is, and vice versa. A processing threshold Z of the pollutant index R is set. When the pollutant index R is greater than the processing threshold Z, exhaust gas pretreatment is performed, otherwise the exhaust gas main treatment is performed directly.

[0077] Specifically, by testing the exhaust gas pollutant index R and conducting a quantitative evaluation of the results, management personnel can quickly understand the pollution situation of the currently collected exhaust gas. The larger the pollutant index R, the greater the harm of the current exhaust gas to the environment, and the need to strengthen the treatment operation. Therefore, it is necessary to pre-treat the exhaust gas first. Conversely, it means that the current exhaust gas is less harmful to the environment, and only pre-treatment is required to meet the emission requirements. By adjusting the treatment process according to the actual situation of the exhaust gas, time can be saved and the efficiency of exhaust gas treatment can be improved.

[0078] Furthermore, the preprocessing evaluation algorithm process in the preprocessing evaluation step is as follows:

[0079] ;

[0080] Where S is the pre-processing score;

[0081] C out is the inlet particle concentration;

[0082] C in is the outlet particulate matter concentration;

[0083] W1 is the particle concentration influence coefficient, which is 0.4;

[0084] H out is the outlet humidity, H in is the inlet humidity;

[0085] W2 is the humidity influence coefficient, which is 0.3;

[0086] T out is the outlet temperature, T tar is the standard temperature;

[0087] T ran is the temperature fluctuation value;

[0088] W3 is the temperature influence coefficient, which is 0.3;

[0089] Specifically, the quantified pretreatment score S, after normalization, can help managers quickly understand the pretreatment effect. The closer the pretreatment score S is to 1, the better the exhaust gas pretreatment effect is, and vice versa. The minimum threshold of the pretreatment score S is set to Y1, and the value of Y1 is 0.8. When the pretreatment score S is less than Y1, the exhaust gas is pretreated again until it meets the requirements and enters the main treatment stage to ensure the quality of exhaust gas pretreatment, thereby improving the effect of subsequent exhaust gas pretreatment.

[0090] Furthermore, the main processing evaluation algorithm in the main processing evaluation process is as follows:

[0091] ;

[0092] in is the primary treatment score;

[0093] S is the pretreatment score;

[0094] Q in is the inlet acid gas concentration, Q out is the outlet acid gas concentration;

[0095] M1 is the acid gas treatment coefficient, which is 0.4;

[0096] is the inlet organic pollutant concentration;

[0097] is the outlet organic pollutant concentration;

[0098] M2 is the treatment coefficient of organic pollutant concentration, which is 0.3;

[0099] G in is the pollutant concentration before oxidation;

[0100] G out is the pollutant concentration after oxidation;

[0101] M3 is the oxidation treatment coefficient, which is 0.3;

[0102] Specifically, the main treatment score P represents the main treatment effect of the exhaust gas. The larger the main treatment score P, the better the main treatment effect of the exhaust gas, and vice versa. When no exhaust gas pretreatment is performed, it means that the current exhaust gas has less harm to the environment. At this time, the pretreatment score S defaults to 1, that is, the maximum value of the pretreatment score S, which can improve the main treatment quality. The emission threshold Y2 of the main treatment score P is set. When the main treatment score P is greater than the emission threshold Y2, the exhaust gas after the main treatment can be discharged. When the main treatment score P is less than the emission threshold Y2, the main treatment is performed again to ensure the quality of the main treatment. At the same time, the quantitative evaluation of the exhaust gas pretreatment and main treatment effects is realized, thereby reducing emission deviations and reducing environmental risks.

[0103] Furthermore, when the main treatment score P is less than the emission threshold Y2, the humidity influence coefficient W2 and the temperature influence coefficient W3 in the pretreatment evaluation algorithm are increased, and the particle concentration influence coefficient W1 is reduced to ensure that W1+W2+W3=1, specifically:

[0104] ;

[0105] ;

[0106] ;

[0107] NW1 is the new particle concentration influence coefficient, NW2 is the new humidity influence coefficient, and NW3 is the new temperature influence coefficient;

[0108] X is the adjustment amount, ranging from 0.05 to 0.1;

[0109] Specifically, when the main treatment score P is less than the emission threshold Y2, W1, W2 and W3 are adjusted to obtain NW1, NW2 and NW3, and brought into the pretreatment evaluation algorithm to increase the influence of subsequent exhaust gas temperature and humidity in the exhaust gas pretreatment process. Because in actual operation, the humidity and temperature of the exhaust gas vary greatly in exhaust gas emissions at different times or from different sources. By increasing the influence of these coefficients, the exhaust gas treatment effect can be adjusted according to its actual situation, thereby improving the flexibility and adaptability of exhaust gas treatment.

[0110] Furthermore, in the main exhaust gas treatment step, nutrients are regularly added to the filter material layer filled with microorganisms, and the photocatalytic oxidation device is regularly cleaned.

[0111] Specifically, regular addition of nutrients can provide microorganisms with the required nitrogen, phosphorus, potassium and other nutrients, thereby promoting their reproduction and activity, and enhancing their ability to degrade pollutants in exhaust gas. During the long-term operation of the photocatalytic oxidation device, the surface of the photocatalytic material is easily covered with pollutants, reducing its photocatalytic activity. Regular cleaning can remove these pollutants and ensure the exhaust gas treatment effect.

[0112] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for treating waste gas for environmental engineering, characterized in that: The following steps are involved: Step S1: waste gas collection, setting up an air suction hood at the waste gas source, using an exhaust fan to suck the waste gas into the gas pipeline, and establishing a sensor system to monitor the data during the waste gas treatment process; Step S2: exhaust gas detection, using the sensor system to detect pollutant data in the exhaust gas, and using the exhaust gas detection algorithm to evaluate the pollutant concentration to obtain the pollutant index R, and set the processing threshold Z of the pollutant index R. When the pollutant index R is greater than the processing threshold Z, the exhaust gas pre-treatment is performed, otherwise the exhaust gas main treatment is directly performed; Step S3: exhaust gas pretreatment. After the exhaust gas is transported to the pretreatment equipment, a filter is first used to reduce the concentration of particulate matter in the exhaust gas, then a dehumidification device is used to reduce the exhaust gas humidity, and finally a temperature control device is used to control the exhaust gas temperature to a target temperature; Step S4: pretreatment evaluation, using the pretreatment evaluation algorithm to quantitatively evaluate the exhaust gas pretreatment effect, obtain the pretreatment score S, and set a minimum threshold value Y1 for the pretreatment score S. When S is less than the minimum threshold value Y1, the exhaust gas is transported to the pretreatment equipment again for treatment until it meets the requirements, and then the exhaust gas is transported to the main treatment equipment; Step S5: main treatment of waste gas, introducing the waste gas into a scrubbing tower to contact with an absorbing liquid, chemical reaction to remove acidic gases, then passing the waste gas through a filter layer filled with microorganisms, using the microorganisms to decompose organic pollutants in the waste gas, and then passing the waste gas through a photocatalytic oxidation device, using a catalyst to oxidize and decompose pollutants under ultraviolet light; Step S6: main treatment evaluation, using the main treatment evaluation algorithm to quantitatively evaluate the main treatment effect of the exhaust gas, obtain the main treatment score P, set the emission threshold Y2 of the main treatment score P, when the main treatment score P is greater than the emission threshold Y2, the exhaust gas after the main treatment can be discharged, otherwise the main treatment is performed again; The exhaust gas detection algorithm process in the exhaust gas detection step is as follows: ； Where R is the pollutant index; D so2 is the sulfur dioxide concentration, D so2，bj is the standard sulfur dioxide concentration; D NOx is the concentration of nitrogen oxides, D NOx,bj is the standard nitrogen oxide concentration; C is the particle concentration, C bj is the standard particle concentration; The larger the pollutant index R is, the higher the pollutant concentration in the environment is, and vice versa. A processing threshold Z of the pollutant index R is set. When the pollutant index R is greater than the processing threshold Z, the exhaust gas pre-treatment is performed, otherwise the exhaust gas main treatment is performed directly; The preprocessing evaluation algorithm process in the preprocessing evaluation step is as follows: ； Where S is the pre-processing score; C out is the inlet particle concentration; C in is the outlet particulate matter concentration; W1 is the particle concentration influence coefficient, which is 0.4; H out is the outlet humidity, H in is the inlet humidity; W2 is the humidity influence coefficient, which is 0.3; T out is the outlet temperature, T tar is the standard temperature; T ran is the temperature fluctuation value; W3 is the temperature influence coefficient, which is 0.3; The larger the pretreatment score S is, the better the effect of exhaust gas pretreatment is, and vice versa. The minimum threshold of the pretreatment score S is set to Y1, and the value of Y1 is 0.

8. When the pretreatment score S is less than Y1, the exhaust gas is pretreated again until it meets the requirements and enters the main treatment stage; The main processing evaluation algorithm in the main processing evaluation process is as follows: ； in is the primary treatment score; S is the pretreatment score; Q in is the inlet acid gas concentration, Q out is the outlet acid gas concentration; M1 is the acid gas treatment coefficient, which is 0.4; is the inlet organic pollutant concentration; is the outlet organic pollutant concentration; M2 is the treatment coefficient of organic pollutant concentration, which is 0.3; G in is the pollutant concentration before oxidation; G out is the pollutant concentration after oxidation; M3 is the oxidation treatment coefficient, which is 0.3; The main treatment score P represents the main treatment effect of the exhaust gas. The larger the main treatment score P is, the better the main treatment effect of the exhaust gas is, and vice versa. When the exhaust gas pretreatment is not performed, the pretreatment score S defaults to 1, and the emission threshold Y2 of the main treatment score P is set. When the main treatment score P is greater than the emission threshold Y2, the exhaust gas after the main treatment can be discharged. When the main treatment score P is less than the emission threshold Y2, the main treatment is performed again.

2. The method for treating waste gas for environmental engineering according to claim 1, characterized in that: When the main treatment score P is less than the emission threshold Y2, the humidity influence coefficient W2 and temperature influence coefficient W3 in the pretreatment evaluation algorithm are increased, and the particle concentration influence coefficient W1 is reduced to ensure that W1+W2+W3=1, specifically: ； ； ； NW1 is the new particle concentration influence coefficient, NW2 is the new humidity influence coefficient, and NW3 is the new temperature influence coefficient; X is the adjustment amount, ranging from 0.05 to 0.1; When the main treatment score P is less than the emission threshold Y2, W1, W2 and W3 are adjusted to obtain NW1, NW2 and NW3, and brought into the pretreatment evaluation algorithm to increase the influence of subsequent exhaust gas temperature and humidity in the exhaust gas pretreatment process, so that the exhaust gas treatment effect can be adjusted according to its actual situation, thereby improving the flexibility of exhaust gas treatment.

3. The method for treating waste gas for environmental engineering according to claim 1, characterized in that: In the main waste gas treatment step, a packing layer is arranged in the washing tower to increase the gas-liquid contact time, and the absorption liquid after the chemical reaction with the waste gas is transported to the liquid treatment system.

4. The method for treating waste gas for environmental engineering according to claim 1, characterized in that: In the main waste gas treatment step, nutrients are regularly added to the filter material layer filled with microorganisms, and the photocatalytic oxidation device is regularly cleaned.

5. The method for treating waste gas for environmental engineering according to claim 3, characterized in that: A distributor is arranged on the top of the packing layer, and the packing layer adopts Raschig ring packing.

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