CN111420521A - Sewage pump station peculiar smell circulation emission reduction and clean emission system and process - Google Patents

Sewage pump station peculiar smell circulation emission reduction and clean emission system and process Download PDF

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Publication number
CN111420521A
CN111420521A CN202010339685.8A CN202010339685A CN111420521A CN 111420521 A CN111420521 A CN 111420521A CN 202010339685 A CN202010339685 A CN 202010339685A CN 111420521 A CN111420521 A CN 111420521A
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gas
activated carbon
ultraviolet lamp
pump station
odor
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CN111420521B (en
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羌烨晟
羌峰
赵顺松
刘丹妮
苏卫忠
刘涛
史天哲
李照海
曹翌奇
何娇
陈淑敏
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Shanghai Zhongcheng Environmental Protection Engineering Technology Co ltd
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Shanghai Zhongcheng Environmental Protection Engineering Technology Co ltd
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Abstract

The invention discloses a sewage pump station peculiar smell circulation emission reduction and clean emission system and process, and belongs to the technical field of environmental protection. The system utilization and treatment process comprises the following steps: and after acid gas is removed by a spray tower, the odor gas enters a condenser under the action of a circulating fan and then enters a normal-temperature oxidation adsorption device for low-concentration gas purification, and finally, part of gas is discharged in a shunting manner, and the other part of gas enters a pump station negative-pressure gas space to form a gas circulation loop with the volatilized odor gas and enters the next treatment period. The sewage pump station peculiar smell circulation emission reduction and purification emission system and the process disclosed by the invention can recycle sewage pump station gas with peculiar smell, save energy, reduce emission, improve waste gas treatment efficiency and save cost, and are suitable for popularization and application.

Description

Sewage pump station peculiar smell circulation emission reduction and clean emission system and process
Technical Field
The invention belongs to the technical field of environmental protection, relates to recycling and comprehensive treatment of peculiar smell gas of a sewage pump station, and particularly relates to a system and a process for recycling, reducing emission and discharging clean peculiar smell of the sewage pump station.
Background
The water body of the sewage pumping station gives off peculiar smell due to the heat of the sky, and the surrounding environment is seriously influenced. The peculiar smell is different from other pollutant emission substances, is sensed by human taste and cannot be qualitatively and quantitatively determined. Although the equivalent of the odor in the current odor emission standard is less than 2000, when the equivalent of the odor is more than 200, people can clearly perceive the odor, and when the equivalent of the odor is more than 600, people feel intolerable, so the complaint of reaching the standard is the pain point and difficulty of the current odor treatment.
At present, a normal-temperature oxidation process or an adsorption process is generally adopted to treat gas with peculiar smell in a sewage pumping station. Among them, the normal temperature oxidation process is a gas purification process which has attracted much attention in recent years, and is mainly suitable for purification of a low concentration gas by destroying gas molecules by a high energy medium such as plasma or ultraviolet rays. However, since the reaction rate of the gas is low, the residence time of the gas to be treated in the apparatus is limited, thereby reducing the efficiency of treating the odorous gas. In addition, most of the existing adsorption processes adopt activated carbon for treatment, but the defect of high operating cost caused by frequent carbon change due to adsorption saturation exists in the treatment of only using the activated carbon.
Therefore, how to provide a system and a process for sewage pumping station odor circulation emission reduction and clean emission with high treatment efficiency and low operation cost is a technical problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
In view of the above, the invention aims to provide a sewage pump station peculiar smell circulation emission reduction and clean emission system and process, which solve the pollution problem caused by the peculiar smell gas of the existing sewage pump station, reduce the operation cost and process energy consumption, and are suitable for popularization and application.
In order to achieve the above purpose, the invention provides the following technical scheme:
a sewage pump station peculiar smell circulation reduces discharging and clean discharge system, includes: a spray tower; the circulating fan, the condenser and the normal-temperature oxidation adsorption device are sequentially connected with the spray tower;
the normal-temperature oxidation absorption device is a gas-solid contact device and comprises a main body and an activated carbon bed layer arranged in the main body, wherein a feed inlet and a discharge outlet are respectively arranged at two ends of the main body, and an air inlet and an air outlet are respectively arranged at two sides of the main body; the activated carbon bed layer is obliquely arranged in the main body at an angle of 40-60 degrees, and two layers of ultraviolet lamp inclined plates are additionally arranged in the middle of the activated carbon bed layer;
the ultraviolet lamp inclined plate is a polycarbonate plate, and ultraviolet lamp tubes are arranged on the ultraviolet lamp inclined plate at intervals.
Preferably, the length of the ultraviolet lamp inclined plate is shorter than that of the activated carbon bed layer, the ultraviolet lamp inclined plate is arranged close to the air inlet, and the ultraviolet lamp inclined plate is arranged close to the air outlet, so that the activated carbon bed layer is divided into three layers.
The invention has the advantages that the inclined activated carbon bed layer loaded with the composite catalyst is arranged in the normal-temperature oxidation adsorption device, so that on one hand, the retention time of peculiar smell pollution gas molecules in the device can be effectively prolonged, and the action efficiency is improved; on the other hand, because the activated carbon is a porous carbonaceous substance and has a highly developed pore structure, the porous structure of the activated carbon provides a large amount of surface area for the activated carbon, and the activated carbon can be fully contacted with gas (impurities), thereby endowing the activated carbon with special adsorption performance, and leading the activated carbon to very easily achieve the aim of adsorbing gaseous pollutants from the gas, and a large amount of molecules on the wall of the activated carbon hole can generate strong attraction force, thereby achieving the aim of adsorbing and keeping harmful impurities in the hole diameter for a long time.
Furthermore, the invention aims to solve the problems of saturated adsorption, frequent carbon change, high operating cost and the like caused by the simple use of the activated carbon at the present stage, and the optimal composite catalyst is loaded on the activated carbon, so that the purification efficiency is improved, the cost is reduced, and the method is suitable for popularization.
Preferably, the activated carbon bed layer is an activated carbon bed loaded with a composite catalyst and used for purifying and removing low-concentration odorous gas after filtration and cooling.
Further, the composite catalyst loaded active carbon bed is composed of the following raw materials in parts by weight: 860 portions of active carbon 840-860 portions, 30-40 portions of titanium dioxide, 8-19 portions of cerium oxide, 5-11 portions of yttrium oxide and 25-33 portions of manganese dioxide.
Preferably, the distance between the ultraviolet lamp tubes on the ultraviolet lamp inclined plate is 5-15 cm.
The ultraviolet lamp tube aims at providing a light source for the composite catalyst loaded in the active carbon, and is beneficial to photocatalysis; and the surface material of ultraviolet lamp swash plate is polycarbonate, and it can improve the transmittance of the ultraviolet lamp of ultraviolet lamp swash plate tow sides, can reduce the absorption gathering of gaseous pollutant molecule on the surface again.
Preferably, the condenser adopts a chilled water circulation cooling system and is connected with an industrial refrigerator.
It should be noted that the invention utilizes the condenser to cool the gas to 5-15 ℃ by local cryogenic regulation, and simultaneously reduces the moisture content of the gas, so as to be beneficial to the subsequent adsorption treatment.
Preferably, the spraying tower absorbs acid gas in the odor gas by using a weak alkaline solution, and the weak alkaline solution is ethanolamine solution, sodium hydroxide solution or ammonia water.
The invention utilizes weak alkaline solutions such as ethanolamine, sodium hydroxide solution, ammonia water and the like to react with acid gas easily to generate salts, and the properties of the salts of the2S, and the like.
The invention also discloses a process for treating the odor circulation emission reduction and clean emission system of the sewage pump station, which comprises the following steps:
and after acid gas is removed by a spray tower, the odor gas enters a condenser under the action of a circulating fan and then enters a normal-temperature oxidation adsorption device for low-concentration gas purification, and finally, part of gas is discharged in a shunting manner, and the other part of gas enters a pump station negative-pressure gas space to form a gas circulation loop with the volatilized odor gas and enters the next treatment period.
The principle of the sewage pump station peculiar smell circulation emission reduction and clean emission system treatment process is as follows:
the peculiar smell gas volatilized from the water body of the pump station firstly passes through a washing process in the pump room, after the acidic gas is removed, the peculiar smell gas enters a condenser through a circulating fan, the water is taken away to reduce the moisture content of the gas, meanwhile, the emission of the peculiar smell gas in the sewage is reduced, the peculiar smell gas with low concentration is purified through a normal-temperature oxidation adsorption device, one part of the peculiar smell gas is discharged in a shunting way, and the other part of the peculiar smell gas enters a negative-pressure gas space of the pump station to take away a small amount of volatilized peculiar smell gas and circulates to the next.
Compared with the prior art, the invention discloses a sewage pump station peculiar smell circulation emission reduction and clean discharge system and a process, and has the advantages that:
1) the invention carries out ultra-clean discharge on the peculiar smell gas of the sewage pump station, can reduce the waste gas treatment pressure, and opens up a new way for enterprises to develop deeply and step into a circular economy development mode.
2) The invention utilizes most of the treated gas, the gas is used as an air inlet source and is introduced into the negative pressure gas space of the pump station to take away a small amount of volatile peculiar smell gas and circulate the gas to the next treatment period, thereby reducing the pollution and influence of excessive tail gas emission on the environment.
3) In the invention, a part of the gas purified by the normal-temperature oxidation adsorption device is discharged in a shunting way, so that the aim of treating the odor substances from the circulating airflow system is fulfilled; the other part of the gas enters a negative pressure gas space of the pump station to take away a small amount of volatilized peculiar smell gas and circulates to the next treatment period. The treatment process disclosed by the invention not only solves the pollution problem caused by the peculiar smell gas of the current sewage pumping station, but also reduces the energy consumption of the production process, and is suitable for popularization and application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a sewage pumping station odor circulation emission reduction and clean emission process.
Fig. 2 is a graph showing the comparison of time-treatment efficiency of activated carbon loaded with a composite catalyst and activated carbon used in the process of degrading toluene under the irradiation of ultraviolet light.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the specification, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a sewage pump station peculiar smell circulation emission reduction and clean discharge system, which comprises: a spray tower; a circulating fan, a condenser and a normal temperature oxidation adsorption device which are sequentially connected with the spray tower;
the normal-temperature oxidation absorption device is a gas-solid contact device and comprises a main body and an activated carbon bed layer arranged in the main body, wherein a feed inlet and a discharge outlet are respectively arranged at two ends of the main body, and an air inlet and an air outlet are respectively arranged at two sides of the main body; the activated carbon bed layer is obliquely arranged in the main body at an angle of 40-60 degrees, and two layers of ultraviolet lamp inclined plates are additionally arranged in the middle of the activated carbon bed layer;
the ultraviolet lamp inclined plate is a polycarbonate plate, and ultraviolet lamp tubes are arranged on the ultraviolet lamp inclined plate at intervals.
Further, the length of ultraviolet lamp swash plate is shorter than the length of active carbon bed, and one deck ultraviolet lamp swash plate installation is close to air inlet department, and another layer ultraviolet lamp swash plate installation is close to air outlet department to cut apart into the three-layer with the active carbon bed.
Furthermore, the activated carbon bed layer is an activated carbon bed loaded with a composite catalyst and is used for purifying and removing low-concentration odorous gas after filtration and cooling. The composite catalyst loaded active carbon bed is prepared from the following raw materials in parts by weight: 860 portions of active carbon 840-860 portions, 30-40 portions of titanium dioxide, 8-19 portions of cerium oxide, 5-11 portions of yttrium oxide and 25-33 portions of manganese dioxide.
Furthermore, the distance between the ultraviolet lamp tubes on the ultraviolet lamp inclined plate is 5-15 cm.
Furthermore, the condenser adopts a chilled water circulation cooling system and is connected with an industrial refrigerator.
With reference to the attached drawing 1 of the specification, the invention also requests to protect a treatment process of the sewage pump station peculiar smell recycling emission reduction and clean emission system, and the specific flow is as follows:
after acid gas is removed by a spray tower 1, the odor gas generated by water volatilization of a sewage pump station enters a condenser 3 under the action of a circulating fan 2 and then enters a normal-temperature oxidation adsorption device 4 for adsorption and purification of low-concentration gas, and finally, part of the gas is discharged in a shunting way, and the other part of the gas forms a gas circulation loop;
wherein, the alkalescent solution absorption method adopted by the spray tower 1 is mainly an ethanolamine method, and H can be removed by utilizing the properties that ethanolamine is easy to react with acid gas to generate salts, absorbs at low temperature and desorbs at high temperature2S, and the like.
The condenser 3 adopts a chilled water circulation cooling system, cools the gas to 5-15 ℃ through local cryogenic regulation, reduces the moisture content of the peculiar smell gas at the same time, is beneficial to subsequent adsorption treatment, and is provided with an industrial refrigerator.
The normal temperature oxidation adsorption device 4 is a novel gas-solid contact device, a feed inlet is arranged above the normal temperature oxidation adsorption device, and a discharge outlet is arranged below the normal temperature oxidation adsorption device. The inclination angle of the active carbon bed layer is about 40-60 degrees, two layers of shorter ultraviolet lamp inclined plates are additionally arranged in the middle, one layer of ultraviolet lamp inclined plate is arranged at the position close to the air inlet, the other layer of ultraviolet lamp inclined plate is arranged at the air outlet, and the active carbon bed layer is divided into three layers.
Furthermore, the ultraviolet lamp sloping plate 5 is made of polycarbonate so as to reduce the adsorption of gas pollutant molecules on the surface thereof. And an ultraviolet lamp tube is arranged on the ultraviolet lamp sloping plate 5 every 5-15cm to provide a light source for catalytic substances in the activated carbon, and activated carbon particles can be more tightly filled under the action of gravity, so that the material filling efficiency is improved.
And the inclined envelope type activated carbon bed layer can provide a larger gas-solid contact filtering area, the larger gas-solid contact filtering area is provided in a unit space so as to reduce resistance, a thicker bed layer is provided so as to ensure contact time, the uniformity of the thickness of the packed bed layer is ensured, and the thickness of the bed layer is generally 25-50 cm.
The active carbon bed in the normal temperature oxidation adsorption device 4 mainly adopts an active carbon bed loaded with a composite catalyst and is used for purifying and removing low-concentration odor gas after filtration and cooling. The active carbon bed of the loaded composite catalyst comprises the following raw materials in parts by weight: 860 portions of active carbon 840-860 portions, 30-40 portions of titanium dioxide, 8-19 portions of cerium oxide, 5-11 portions of yttrium oxide and 25-33 portions of manganese dioxide.
In order to further describe the technical scheme disclosed by the invention application and verify the technical effect achieved by the technical scheme, the inventor carries out the following experiments:
performance measurement of composite catalyst on activated carbon bed layer
(1) The composite catalyst on the active carbon bed layer comprises the following raw materials:
860 portions of active carbon 840-860 portions, 30-40 portions of titanium dioxide, 8-19 portions of cerium oxide, 5-11 portions of yttrium oxide and 25-33 portions of manganese dioxide.
(2) Determination of photocatalytic performance of composite catalyst on activated carbon bed
The optimized activated carbon loaded with the composite catalyst is loaded into an adsorption device with an ultraviolet lamp panel, toluene is used as a typical volatile organic pollutant for gas pollutants, and CTC90 is selected as the activated carbon and the activated carbon loaded with the composite catalytic substance, and the particle size of the activated carbon is 4 mm. And (3) turning on ultraviolet rays at the temperature of 25 ℃ to perform a photocatalytic reaction so as to finish the degradation of organic pollutants in the gas.
In the process of photocatalytic reaction, gas at a detection port at the tail end of the device is detected every minute, the outlet concentration of toluene in the gas is detected by a hydrogen flame ionization detector, and the purification efficiency of the composite catalyst on the toluene gas under different time conditions is calculated.
The performance of different catalysts is measured by the measuring method, and the specific results are shown in the following table 1:
TABLE 1
Figure BDA0002467919380000071
As can be seen from the data in the table 1, when only activated carbon is used as the adsorbing material, the treatment efficiency of the activated carbon begins to decrease within 20-40min, the treatment efficiency decreases fastest within 80-100min, and the activated carbon is saturated within about 120 min; when active carbon is doped and mixed with any one of the catalysts of titanium dioxide, cerium oxide, yttrium oxide and manganese dioxide to be used as an adsorbent, the treatment efficiency begins to decrease within 40-60min, the treatment efficiency decreases fastest within 60-80min, and the adsorbent is saturated within about 140 min; when the activated carbon is mixed with the titanium dioxide, the cerium oxide, the yttrium oxide and the manganese dioxide in proportion to be used as the adsorbent, the treatment efficiency begins to decrease within 40-60min, the treatment efficiency decreases fastest within 80-100min, and the composite catalyst reaches saturation within 160-180min, so that the composite catalyst used in the invention has the best adsorption and degradation effects compared with other catalysts, and the adsorption time to saturation is longer.
In addition, fig. 2 is a graph comparing the time-treatment efficiency of the activated carbon loaded with the composite catalytic substance and the corresponding time-treatment efficiency of the activated carbon when the activated carbon degrades toluene under ultraviolet light. As shown in FIG. 2, after 69 minutes of light irradiation, the treatment efficiency of toluene adsorption by activated carbon was 50%, and the treatment efficiency of toluene by activated carbon loaded with the composite catalytic material was 70%. The comparison shows that the degradation efficiency of the composite catalytic substance loaded active carbon is obviously improved, and the organic pollutants in the gas can be effectively removed, which also shows that the composite catalytic substance loaded active carbon has better treatment effect.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. The utility model provides a sewage pump station peculiar smell circulation emission reduction and clean discharge system which characterized in that includes: a spray tower; the circulating fan, the condenser and the normal-temperature oxidation adsorption device are sequentially connected with the spray tower;
the normal-temperature oxidation absorption device is a gas-solid contact device and comprises a main body and an activated carbon bed layer arranged in the main body, wherein a feed inlet and a discharge outlet are respectively arranged at two ends of the main body, and an air inlet and an air outlet are respectively arranged at two sides of the main body; the activated carbon bed layer is obliquely arranged in the main body at an angle of 40-60 degrees, and two layers of ultraviolet lamp inclined plates are additionally arranged in the middle of the activated carbon bed layer;
the ultraviolet lamp inclined plate is a polycarbonate plate, and ultraviolet lamp tubes are arranged on the ultraviolet lamp inclined plate at intervals.
2. The sewage pumping station odor circulation emission reduction and purification discharge system according to claim 1, wherein the activated carbon bed layer is an activated carbon bed loaded with a composite catalyst and used for purifying and removing low-concentration odor gas after filtration and cooling.
3. The sewage pumping station odor circulation emission reduction and net emission system of claim 2, wherein the activated carbon bed loaded with the composite catalyst is composed of the following raw materials in parts by weight: 860 portions of active carbon 840-860 portions, 30-40 portions of titanium dioxide, 8-19 portions of cerium oxide, 5-11 portions of yttrium oxide and 25-33 portions of manganese dioxide.
4. The sewage pumping station odor circulation emission reduction and net emission system of claim 1, wherein the ultraviolet lamp sloping panels are shorter in length than the activated carbon bed layer, and one layer of the ultraviolet lamp sloping panels is installed close to the air inlet, and the other layer of the ultraviolet lamp sloping panels is installed close to the air outlet, so as to divide the activated carbon bed layer into three layers.
5. The sewage pumping station odor circulation emission reduction and net emission system according to claim 4, wherein the distance between the ultraviolet lamp tubes on the ultraviolet lamp inclined plate is 5-15 cm.
6. The sewage pumping station odor circulation emission reduction and purification discharge system according to claim 1, wherein the condenser is a chilled water circulation cooling system and is connected with an industrial refrigerator.
7. The sewage pumping station odor circulation emission reduction and purification discharge system according to claim 1, wherein the spray tower absorbs acidic gas in the odor gas by using weak alkaline solution, and the weak alkaline solution is ethanolamine solution, sodium hydroxide solution or ammonia water.
8. A sewage pump station odor circulation emission reduction and purification emission process, which is characterized in that the process is used for treating sewage pump station odor gas by using the sewage pump station odor circulation emission reduction and purification emission system of any one of the claims 1 to 7, and the specific operation flow is as follows:
and after acid gas is removed by a spray tower, the odor gas enters a condenser under the action of a circulating fan and then enters a normal-temperature oxidation adsorption device for low-concentration gas purification, and finally, part of gas is discharged in a shunting manner, and the other part of gas enters a pump station negative-pressure gas space to form a gas circulation loop with the volatilized odor gas and enters the next treatment period.
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