CN115490404A - Wastewater and waste gas treatment system and method for sewage plant - Google Patents

Wastewater and waste gas treatment system and method for sewage plant Download PDF

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CN115490404A
CN115490404A CN202211437066.8A CN202211437066A CN115490404A CN 115490404 A CN115490404 A CN 115490404A CN 202211437066 A CN202211437066 A CN 202211437066A CN 115490404 A CN115490404 A CN 115490404A
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tank
parts
oxygen consumption
wastewater
catalytic system
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CN115490404B (en
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于秀梅
刘承业
刘浩
陈安民
王鹏
郭滨坤
毕正鹏
王文辉
薄鹏
刘乐乐
于国磊
尚友才
张波
刘洪源
赵金龙
王文帅
王占成
孟繁友
杨新明
宋磊
翟宝龙
李广宁
肖宏涵
朱朋凯
林金岭
刘传才
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Lihuayi Weiyuan Chemical Co ltd
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Lihuayi Weiyuan Chemical Co ltd
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/38—Removing components of undefined structure
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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    • B01J23/89—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals
    • B01J23/8933—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals also combined with metals, or metal oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/898—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals also combined with metals, or metal oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with vanadium, tantalum, niobium or polonium
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
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    • C02F1/00—Treatment of water, waste water, or sewage
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Abstract

The invention relates to the technical field of sewage treatment, and discloses a sewage plant wastewater and waste gas treatment system and a sewage plant wastewater and waste gas treatment method. According to the invention, the first catalytic system, the second catalytic system, the third catalytic system, the fourth catalytic system and the fifth catalytic system are added in the existing wastewater and waste gas treatment system, so that the conversion and decomposition of methane in waste gas can be realized. After the biological activator is used, methane biological purification dominant bacteria capable of phagocytosing methane can be domesticated, so that the methane becomes a carbon source on which organisms live.

Description

Wastewater and waste gas treatment system and method for sewage plant
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a sewage plant wastewater and waste gas treatment system and a sewage plant wastewater and waste gas treatment method.
Background
The high-concentration peculiar smell gas of the sewage plant is mainly sourced from the front end of the sewage treatment process, namely: a regulating tank, a floatation tank, an anaerobic tank, an aerobic tank, a secondary sedimentation tank and a sludge concentration tank. The waste gas discharged by sewage plants is generated in the whole process, and even the sewage reaches the discharge outlet and still has slight peculiar smell.
Sewage treatment plant, workshop section are many, the area is big, the peculiar smell gas concentration of handling is high and the volume is huge, brings huge economic burden for the enterprise. How to reduce the yield of the peculiar smell and purify the peculiar smell with low consumption becomes a problem which needs to be solved urgently at present.
The peculiar smell gas contains large amount of low concentration methane, when the methane is high concentration, the incineration method is more economical to treat, the low concentration methane in the sewage farm treatment process needs to supplement the combustion value, the operation cost is high while the carbon emission is increased, and the incineration cost is higher when the concentration is lower. The limit value of the methane standard in the discharge standard of waste gas from town sewage treatment is very loose: the maximum allowable concentration of the primary standard is 0.5%, and the maximum allowable concentration of the secondary and tertiary standards is 1% (GB 18918-2002). The emission of the waste gas of the enterprise sewage treatment only controls non-methane total hydrocarbon, no methane emission index exists, and numerous sewage plants exist in China, so that the total methane emission amount in the sewage treatment process is very large, and the greenhouse effect is greatly influenced.
Nowadays, the requirement of wastewater purification is increasingly improved, the process of deep purification and addition of carbon sources in a wastewater treatment field is very common, and the addition of the carbon sources is beneficial to the growth and propagation of microorganisms in a water body with exhausted pollutants, so that the pollutants are further purified, and better wastewater treatment water quality is obtained.
One side is the behavior of consuming huge added carbon source; on one hand, large amount of low concentration methane cannot be well purified and utilized, and only can be directly discharged into the atmosphere to increase greenhouse gas effect. Therefore, the resource utilization of methane generated in sewage treatment plants is required to further reduce the methane emission in the future.
Except high concentration peculiar smell gas, sewage factory uses the ozone catalytic reaction pond in the sewage treatment can produce ozone tail gas, and ozone tail gas is the ozone gas that ozone escaped from the aquatic when handling sewage, if directly discharges this part ozone in the atmosphere, can cause environmental pollution equally, consequently sewage factory can dispose the ozone disappearance ware and heat activated carbon disappearance processing to ozone tail gas, has not only increased investment and working costs, and efficiency is unstable moreover. Therefore, the problem that the energy-consumption-free purification method of the ozone tail gas and the reasonable utilization of the ozone produced with high energy consumption are urgently needed to be solved at present is also found.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a system and a method for treating wastewater and waste gas of a sewage plant.
In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides a sewage factory waste water exhaust-gas treatment system which characterized in that: the system comprises a wastewater collection tank, a first catalytic system, a regulating tank, a second catalytic system, an air floatation tank, an anaerobic tank, a primary oxygen consumption tank, a secondary oxygen consumption tank and a secondary sedimentation tank which are sequentially connected through a water delivery pipeline, and further comprises a sludge concentration tank, a third catalytic system, a fourth catalytic system, a fifth catalytic system, a peculiar smell treatment device, a first dewatering purifier, a first induced draft fan, a primary oxygen consumption centrifugal fan, a second dewatering purifier, a second induced draft fan and a secondary oxygen consumption centrifugal fan; the sludge outlet of the adjusting tank, the sludge outlet of the air flotation tank, the sludge outlet of the anaerobic tank, the sludge outlet of the primary oxygen consumption tank, the sludge outlet of the secondary aerobic tank and the sludge outlet of the secondary sedimentation tank are respectively connected into an inlet pipeline of the sludge concentration tank through pipelines; the primary oxygen consumption tank is provided with a first circulating water pipeline, the first circulating water pipeline is connected with a third catalytic system, the outlet of the first circulating water pipeline is connected into the water inlet pipeline of the primary oxygen consumption tank, the secondary oxygen consumption tank is provided with a second circulating water pipeline, and the second circulating water pipeline is connected with a fourth catalytic system;
the waste water collecting tank waste gas, the adjusting tank waste gas, the air flotation tank waste gas, the anaerobic tank waste gas and the sludge concentration tank waste gas are respectively merged into a first dewatering purifier inlet pipeline through pipelines, a first dewatering purifier outlet is sequentially connected with a first induced draft fan and a first-stage oxygen consumption centrifugal fan through pipelines, a first-stage oxygen consumption centrifugal fan outlet is connected with a first-stage oxygen consumption tank aeration head through pipelines, the first-stage oxygen consumption tank waste gas is connected with a second dewatering purifier inlet through pipelines, a second dewatering purifier outlet is sequentially connected with a second induced draft fan and a second-stage oxygen consumption centrifugal fan through pipelines, a second-stage oxygen consumption centrifugal fan outlet is connected with a second-stage oxygen consumption tank aeration head through pipelines, the second-stage oxygen consumption tank waste gas and the second sedimentation tank waste gas are respectively merged into a gas inlet main pipeline of the odor treatment device through pipelines, the odor treatment device is provided with a third circulating water pipeline, and the third circulating water pipeline is connected with a fifth catalytic system;
catalysts are arranged in the first catalytic system, the second catalytic system, the third catalytic system, the fourth catalytic system and the fifth catalytic system, and the catalysts are fixed bed heterogeneous catalysts and comprise the following metal components in percentage by mass: 5-10% of Au, 5-15% of Pu, 1-2% of Co, 5-20% of Pt, 5-10% of Os, 5-10% of Pd, 5-10% of Ru, 5-20% of Ti, 5-10% of Rh, 5-10% of Ta and 0.05-1% of Y. 0.5-1% of Sm0.5-1%, 0.5-1% of Nd, 5-10% of Ce, 5-10% of La, 1-5% of Fe, 1-5% of Zn, 5-10% of Ca and 5-10% of Ni.
Further, the method comprises the following steps of; the preparation process of the catalyst is as follows:
after surface treatment, soaking the ceramic structured packing in a mixed solution of organic metal salt, shaking for 3-5 times after soaking, instantly extracting the liquid level, draining for 30min, drying at 105 ℃, and then drying and calcining the soaked and dried ceramic structured packing for multiple times;
wherein the organic metal salt solution is metal citrate, metal amino acid salt or metal gluconate, and the metal species is Au, pu, co, pt, os, pd, ru, ti, rh, ta, Y, sm, nd, ce, la, fe, zn, ca, ni;
the concentration of the organic metal salt solution is 3-5wt.%;
the calcination conditions were: heating to 105 ℃ at the speed of 15 ℃/h for 4h, slowly heating to 250 ℃ at the speed of 5 ℃/h for 10h, then slowly heating to 650 ℃ at the speed of 5 ℃/h for 4h, and calcining for 5 times.
Further, the step of; still include ozone catalytic reaction pond, the ozone catalytic reaction pond water inlet is passed through the pipe connection to two heavy pond delivery ports, ozone catalytic reaction pond waste gas merges peculiar smell processing apparatus gas inlet main line through the pipeline, be equipped with the line mixer on the main line.
Further, the method comprises the following steps of; and a multi-stage catalyst layer is arranged in the first catalytic system.
The other technical scheme of the invention is as follows: a method for treating wastewater and waste gas of a sewage plant is characterized by comprising the following steps:
the wastewater collection tank collects wastewater of a sewage plant, the wastewater is pumped into a first catalytic system, a regulating tank, a second catalytic system, an air floatation tank and an anaerobic tank by a pump in sequence through pipelines for wastewater treatment, and methane gas carried in the wastewater in the first catalytic system and the second catalytic system is catalytically degraded;
pumping the wastewater after anaerobic treatment into a primary oxygen consumption tank by a pump for wastewater treatment, pumping 1/2 volume of the wastewater after treatment into a secondary oxygen consumption tank, performing internal reflux on 1/2 volume of the wastewater as nitrate liquid, pumping 1/3 volume of internal reflux into a third catalytic system by a circulating pump, performing catalytic degradation on methane gas carried in the wastewater in the third catalytic system, and feeding the rest internal reflux into an anaerobic tank, wherein the waste gas generated by a wastewater collection tank, a regulating tank, an air flotation tank, the anaerobic tank and a sludge concentration tank is subjected to water removal by a first water removal purifier, and then sequentially enters an aeration head of the primary oxygen consumption tank for an aeration gas source through a first induced draft fan and a primary oxygen consumption centrifugal fan;
1/2 volume of wastewater enters a secondary sedimentation tank after wastewater treatment in a secondary oxygen consumption tank, 1/2 volume of wastewater is taken as nitrate state liquid to carry out internal reflux, 3/4 volume of internal reflux liquid is pumped into a fourth catalytic system through a circulating pump, methane gas carried in the wastewater is catalytically degraded in the fourth catalytic system, the rest internal reflux liquid enters a primary oxygen consumption tank, and waste gas generated by the primary oxygen consumption tank is dewatered through a second dewatering purifier and then sequentially enters an aeration head of the secondary oxygen consumption tank through a second induced draft fan and a secondary oxygen consumption centrifugal fan to be used as an aeration gas source;
the waste water in the secondary sedimentation tank enters an ozone catalytic reaction tank after being treated, the waste water in the ozone catalytic reaction tank is discharged after reaching the standard after being treated, ozone tail gas generated by the ozone catalytic reaction tank is mixed with a secondary oxygen consumption tank and waste gas generated by the secondary sedimentation tank in a pipeline mixer and then enters an odor treatment device for waste gas treatment, ozone in the odor treatment device can react with organic gas in the waste gas to remove the ozone, the recovered waste water is used as circulating make-up water of the odor treatment device, water carrying the waste gas in the odor treatment device is pumped into a fifth catalytic system through a circulating pump, methane gas carried in the waste water is catalytically degraded in the fifth catalytic system, and the waste gas is discharged after reaching the standard after being treated;
and sludge generated by the regulating tank, sludge generated by the air flotation tank, sludge generated by the anaerobic tank, sludge generated by the primary oxygen consumption tank, sludge generated by the secondary aerobic tank and sludge generated by the secondary sedimentation tank respectively enter a sludge concentration tank to be concentrated and then are discharged as dry sludge.
Further, the method comprises the following steps of; after the wastewater in the step 1) enters an anaerobic tank, adding a biological activator into the anaerobic tank every day to domesticate methane biological purification dominant bacteria capable of phagocytosing methane, wherein the domestication period is 30 days, and the dissolved oxygen concentration of the anaerobic tank is controlled to be 0.5 +/-0.1 mg/L.
Further, the method comprises the following steps of; in the step 4), adding a biological activator into the peculiar smell treatment device every day, wherein the acclimation period is 30 days.
Further, the step of; the biological activator comprises the following components in percentage by weight: 15 to 30 percent of amino acid, 10 to 20 percent of compound vitamin, 20 to 40 percent of inorganic salt and 10 to 40 percent of trace element;
the amino acid comprises the following components in parts by weight: 1 to 5 parts of alanine, 10 to 15 parts of tyrosine, 1 to 5 parts of tryptophan and 2 to 10 parts of phenylalanine;
the composite vitamin comprises the following components in parts by weight: 1 to 5 parts of vitamin B1, 1 to 5 parts of vitamin B2, 1 to 5 parts of vitamin B9, 1 to 5 parts of vitamin B12, 10 to 15 parts of vitamin C, 10 to 15 parts of nicotinic acid and 10 to 15 parts of nicotinamide;
the inorganic salt comprises the following components in parts by weight: 1 to 5 parts of calcium citrate, 1 to 5 parts of zinc gluconate and 20 to 35 parts of potassium nitrite;
the trace elements comprise the following components in parts by weight: 10 to 20 parts of tungsten diselenide and 1 to 5 parts of potassium iodide.
Further, the method comprises the following steps of; the mass-volume ratio of the biological activator added into the anaerobic tank every day to the daily sewage treatment capacity of a sewage plant is 1g 3 The mass-volume ratio of the biological activator added by the peculiar smell treatment device every day to the daily sewage treatment capacity of a sewage plant is 1g 3 。
Further, the method comprises the following steps of; the adding port of the anaerobic tank and the adding port of the peculiar smell treatment device are supplemented with an activated supplement after a biological activator is added, the adding mass ratio of the activated supplement to the biological activator is 1-5, and the activated supplement comprises the following components in percentage by weight: 20 to 30 percent of compound vitamin, 30 to 50 percent of inorganic salt and 30 to 50 percent of trace element;
the composite vitamin comprises the following components in parts by weight: 1 to 5 parts of vitamin B1, 1 to 5 parts of vitamin B2, 1 to 5 parts of vitamin B9, 1 to 5 parts of vitamin B12, 10 to 15 parts of vitamin C, 10 to 15 parts of nicotinic acid and 10 to 15 parts of nicotinamide;
the inorganic salt comprises the following components in parts by weight: 1 to 5 parts of calcium citrate, 1 to 5 parts of zinc gluconate and 20 to 35 parts of potassium nitrite;
the trace elements comprise the following components in parts by weight: 10 to 20 parts of tungsten diselenide and 1 to 5 parts of potassium iodide.
The invention has the beneficial effects that:
1) The invention can realize the conversion and decomposition of methane in the waste gas by adding a first catalytic system, a second catalytic system, a third catalytic system, a fourth catalytic system and a fifth catalytic system in the existing waste water and waste gas treatment system, and the decomposition formula of the methane under the action of the nano catalyst is as follows:
Figure 679699DEST_PATH_IMAGE001
the carbon source is formed after the methane is decomposed, so that the emission concentration of the methane in the waste gas is reduced, and the carbon source can be used for the carbon source consumption of the treatment system.
2) The catalyst of the invention has the advantages of little dosage, high efficiency and long service life, the catalytic reaction time only needs to stay in the reaction cavity for 1.5-10.0 s, and the reaction time of the conventional catalyst is mostly measured in min; the catalyst of the invention has self-cleaning property, can run in extreme environment with heavy pollution for a long period, has the service life of more than 10 years, has extremely short service life in severe environment, even is inactivated instantly, and is difficult to recover and revive.
3) The waste gas generated by the waste water collecting tank, the adjusting tank, the air flotation tank and the sludge concentration tank is used as the aeration gas source of the primary oxygen consumption tank, and the waste gas generated by the primary oxygen consumption tank is used as the aeration gas source of the secondary oxygen consumption tank, so that the consumption of a large amount of fresh air is reduced, and the absorption and purification of the waste gas are improved.
4) After the biological activating agent is used, methane biological purification dominant bacteria capable of phagocytizing methane can be domesticated, so that the methane becomes a carbon source on which organisms live, and the methane becomes a carbon source supplemented in the treatment process of a sewage treatment plant while the purification of the methane in waste gas is realized.
Drawings
FIG. 1 is a block diagram of a system according to embodiment 1 of the present invention;
fig. 2 is a block diagram of the system of comparative example 1.
In the figure: 1. a wastewater collection tank; 2. a first catalytic system; 3. a regulating reservoir; 4. a second catalytic system; 5. an air floatation tank; 6. an anaerobic tank; 7. a primary oxygen consumption tank; 8. a secondary oxygen consumption pool; 9. a secondary sedimentation tank; 10. a sludge concentration tank; 11. a third catalytic system; 12. a fourth catalytic system; 13. a fifth catalytic system; 14. a peculiar smell treatment device; 15. a first water removal purifier; 16. a first induced draft fan; 17. a first-stage oxygen consumption centrifugal fan; 18. a second water removal purifier; 19. a second induced draft fan; 20. a secondary oxygen consumption centrifugal fan; 21. an ozone catalytic reaction tank; 22. a pipeline mixer.
Detailed Description
Example 1:
as shown in fig. 1, a wastewater and waste gas treatment system for a sewage plant comprises a wastewater collection tank 1, a first catalytic system 2, an adjusting tank 3, a second catalytic system 4, an air flotation tank 5, an anaerobic tank 6, a primary oxygen consumption tank 7, a secondary oxygen consumption tank 8 and a secondary sedimentation tank 9 which are sequentially connected through a water pipeline, and further comprises a sludge concentration tank 10, a third catalytic system 11, a fourth catalytic system 12, a fifth catalytic system 13, an odor treatment device 14, a first dewatering purifier 15, a first induced draft fan 16, a primary oxygen consumption centrifugal fan 17, a second dewatering purifier 18, a second induced draft fan 19 and a secondary oxygen consumption centrifugal fan 20; the sludge outlet of the regulating tank 3, the sludge outlet of the air flotation tank 5, the sludge outlet of the anaerobic tank 6, the sludge outlet of the primary oxygen consumption tank 7, the sludge outlet of the secondary aerobic tank 8 and the sludge outlet of the secondary sedimentation tank 9 are respectively connected into an inlet pipeline of a sludge concentration tank 10 through pipelines; the primary oxygen consumption tank 7 is provided with a first circulating water pipeline, the first circulating water pipeline is connected with a third catalytic system 11, the outlet of the first circulating water pipeline is merged into the water inlet pipeline of the primary oxygen consumption tank 7, the secondary oxygen consumption tank 8 is provided with a second circulating water pipeline, and the second circulating water pipeline is connected with a fourth catalytic system 12;
the waste gas of the waste water collecting tank 1, the waste gas of the adjusting tank 3, the waste gas of the air flotation tank 5, the waste gas of the anaerobic tank 6 and the waste gas of the sludge concentrating tank 10 are collected and merged into an inlet pipeline of a first dewatering purifier 15 through a peculiar smell collecting cover and a pipeline respectively, an outlet of the first dewatering purifier 15 is sequentially connected with a first induced draft fan 16 and a first-stage oxygen consumption centrifugal fan 17 through pipelines, an outlet of the first-stage oxygen consumption centrifugal fan 17 is connected with an aeration head of a first-stage oxygen consumption tank 7 through a pipeline, the waste gas of the first-stage oxygen consumption tank 7 is connected with an inlet of a second dewatering purifier 18 through a peculiar smell collecting cover and a pipeline respectively, an outlet of the second dewatering purifier 18 is sequentially connected with a second induced draft fan 19 and a second-stage oxygen consumption centrifugal fan 20 through pipelines, an outlet of the second-stage oxygen consumption centrifugal fan 20 is connected with an aeration head of a second-stage oxygen consumption tank 8 through a pipeline, the waste gas of the second-stage oxygen consumption tank 8 and the waste gas of a second sedimentation tank 9 are merged into an inlet main pipeline of a peculiar smell processing device 14 through a peculiar smell collecting cover and a pipeline respectively, the peculiar smell processing device 14 is provided with a third circulating water pipeline, and a fifth catalytic system 13 is connected to the third circulating water pipeline;
catalysts are arranged in the first catalytic system 2, the second catalytic system 4, the third catalytic system 11, the fourth catalytic system 12 and the fifth catalytic system 13, and are fixed bed heterogeneous catalysts which comprise the following metal components in percentage by mass: 10% of Au, 15% of Pu, 1.2% of Co1, 5% of Pt, 10% of Os, 5% of Pd, 5% of Ru, 5% of Ti, 5.5% of Rh, 8% of Ta, 0.1% of Y, 0.5% of Sm0, 0.5% of Nd, 5% of Ce, 8% of La, 5% of Fe, 1.2% of Zn1, 5% of Ca and 5% of Ni.
In the preferred embodiment, the ceramic structured packing with AlO as the base material is selected, the parameters are shown in Table 1,
TABLE 1
Model number Specific surface area m 2 /m 3 Porosity% Bulk weight kg/m 3 Bee height mm Wave distance mm Thickness of the sheet mm Number of theoretical plates m -1 Maximum F factor m/s. (kg/m.) 3 ) Pressure drop Pa/m
00 400 76 500-520 7.0±0.5 14±0.5 1.0-1.3 2.8-3.2 2.0-2.2 180-260
The preparation process of the catalyst comprises the following steps:
(1) Carrying out surface treatment on the ceramic structured packing;
a. firstly, soaking the ceramic structured packing in alkali liquor for 5 hours, draining and washing until the size of a wet PH test paper is smaller than 8.5;
b. soaking the ceramic regular packing drained by alkali washing in acid liquor for 5 hours, draining and washing until the pH test paper is more than 4.5 attached to the wet pH test paper;
c. after 2-3 times, burning for 5 hours at 650 ℃, heating at a speed of less than 10 ℃/hour, and stopping the furnace and naturally cooling to room temperature;
(2) Immersing the ceramic regular filler after surface treatment into an organic metal salt solution with the concentration of 3-5wt.%, shaking for 3-5 times after immersion, instantly extracting the liquid level, draining for 30min, and drying at 105 ℃; the organic metal salt solution is metal citrate, and the metal species are Au, pu, co, pt, os, pd, ru, ti, rh, ta, Y, sm, nd, ce, la, fe, zn, ca and Ni;
(3) Drying, sending into an incinerator, heating to 105 ℃ at a speed of 15 ℃/h, maintaining for 4 hours, slowly heating to 250 ℃ at a speed of 5 ℃/h, stabilizing for 10 hours, slowly heating to 650 ℃ at a speed of 5 ℃/h, stabilizing for 4 hours, and slowly cooling to room temperature;
(4) Repeating the steps (2) and (3) for 5 times to obtain the product.
In this embodiment, preferably, a three-stage catalyst layer is disposed in the first catalytic system.
Preferably, the system further comprises an ozone catalytic reaction tank 21, a water outlet of the secondary sedimentation tank 9 is connected with a water inlet of the ozone catalytic reaction tank 21 through a pipeline, a waste gas outlet of the ozone catalytic reaction tank 21 is merged into a gas inlet main pipeline of the odor treatment device 14 through a pipeline, and a pipeline mixer 22 is arranged on the main pipeline.
A method for treating wastewater and waste gas of a sewage plant comprises the following steps:
1) The wastewater collecting tank 1 collects wastewater of a sewage plant, the wastewater is treated at normal temperature and normal pressure in full flow for about 1.5-5.5 min, and the wastewater passes through a pipeline at a speed of 600m 3 The flow rate of the methane is pumped into a first catalytic system 2, a regulating tank 3, a second catalytic system 4, an air flotation tank 5 and an anaerobic tank 6 by a pump in sequence for wastewater treatment, and methane gas carried in the wastewater in the first catalytic system 2 and the second catalytic system 4 is degraded by catalysis;
2) The wastewater is adjusted by an adjusting tank 3, suspended matters and emulsions are removed by an air flotation tank 5, and then the wastewater enters an anaerobic tank 6, the dissolved oxygen concentration of the anaerobic tank 6 is controlled to be 0.5 +/-0.1 mg/L, the gas consumption of the air flotation tank 5 is adjusted according to the dissolved oxygen concentration of the anaerobic tank 6, and the generation of methane is inhibited; pumping the wastewater after anaerobic treatment into a primary oxygen consumption tank 7 by a pump for wastewater treatment, enabling 1/2 volume of the wastewater after treatment to enter a secondary oxygen consumption tank 8, enabling 1/2 volume of the wastewater to serve as nitrate state liquid for internal reflux, pumping 1/3 volume of internal reflux into a third catalytic system 11 by a circulating pump, catalytically degrading methane gas carried in the wastewater in the third catalytic system 11, enabling the rest internal reflux to enter an anaerobic tank 6, removing water from waste gas generated by a wastewater collection tank 1, a regulating tank 3, an air flotation tank 5, the anaerobic tank 6 and a sludge concentration tank 10 by a first water removal purifier 15, enabling the waste gas to enter a primary oxygen centrifugal fan 17 by a first induced draft fan 16, and enabling the compressed gas with 58.8Kpa and containing peculiar smell to be sent into an aeration head of the primary oxygen consumption tank 7 for an aeration gas source at 22000 cubic meter/hour by the primary oxygen centrifugal fan 17; after the wastewater is treated by the primary oxygen consumption tank 7 and the third catalytic system 11, sludge digestion and dominant strain screening can be realized, and the purification capacity of the existing strains on peculiar smell components is increased, so that the waste gas generated by the primary oxygen consumption tank 7 can be used as an aeration gas source of the secondary oxygen consumption tank 8;
3) 1/2 volume of wastewater treated in the secondary oxygen consumption tank 8 enters a secondary sedimentation tank 9,1/2 volume of wastewater is taken as nitrate state liquid to carry out internal reflux, 3/4 volume of internal reflux liquid is pumped into a fourth catalytic system 12 through a circulating pump, methane gas carried in the wastewater is catalytically degraded in the fourth catalytic system 12, the rest internal reflux liquid enters a primary oxygen consumption tank 7, waste gas generated by the primary oxygen consumption tank 7 is dewatered through a second dewatering purifier 18 and then enters a secondary oxygen consumption centrifugal fan 20 through a second induced draft fan 19, and the secondary oxygen consumption centrifugal fan 20 sends the gas which is full of compressed 58.8Kpa and contains peculiar smell to an aeration head of the secondary oxygen consumption tank 8 at 22000 cubic meters per hour for supplying an aeration gas source; after the wastewater is treated by the secondary oxygen consumption pool 8 and the fourth catalytic system 12, further digestion of sludge and further screening of dominant bacteria can be realized, and the purification capacity of the existing bacteria on residual peculiar smell components is improved;
4) The waste water in the secondary sedimentation tank 9 enters an ozone catalytic reaction tank 21 after being treated, the waste water in the ozone catalytic reaction tank 21 is discharged after reaching the standard after being treated, ozone tail gas generated by the ozone catalytic reaction tank 21 is mixed with waste gas generated by the secondary oxygen consumption tank 8 and the secondary sedimentation tank 9 in a pipeline mixer 22 and then enters an odor treatment device 14 for waste gas treatment, ozone in the odor treatment device 14 can react with organic gas in the waste gas to remove ozone, the recycled waste water is used as circulating make-up water of the odor treatment device 14, the water with the waste gas in the odor treatment device 14 is pumped into a fifth catalytic system 13 through a circulating pump, methane gas carried in the waste water is catalytically degraded in the fifth catalytic system 13, and the waste gas is discharged after reaching the standard;
5) And the sludge generated by the regulating tank 3, the sludge generated by the air flotation tank 5, the sludge generated by the anaerobic tank 6, the sludge generated by the primary oxygen consumption tank 7, the sludge generated by the secondary aerobic tank 8 and the sludge generated by the secondary sedimentation tank 9 respectively enter a sludge concentration tank 10 to be concentrated and then are discharged as dry sludge.
Preferably, in this embodiment, in step 2), 10g of biological activator is added to an addition port of the anaerobic tank 6 every day, and 10g of activating supplement is added along with the addition, so as to acclimatize dominant bacteria for methane biological purification capable of phagocytosing methane, the acclimation period is 30 days, the wastewater mixed with the biological activator after anaerobic treatment is pumped into the primary oxygen consumption tank 7 by a pump for wastewater treatment, and the mass-to-volume ratio of the biological activator added to the daily wastewater treatment amount of the sewage plant in the anaerobic tank 6 every day is 1g 1440m 3 ；
In the step 4), 0.06g of biological activator is added into an adding port of the peculiar smell treatment device 14 every day, and 0.06g of activating supplement is added along with supplement so as to acclimate methane biological purification dominant bacteria capable of phagocytizing methane, the acclimation period is 30 days, and the mass volume ratio of the biological activator added into the peculiar smell treatment device 14 every day to the daily sewage treatment amount of a sewage plant is 1g 240000m 3 。
The biological activator comprises the following components in percentage by weight: 20% of amino acid, 20% of compound vitamin, 40% of inorganic salt and 20% of trace elements;
the amino acid comprises the following components in parts by weight: 5 parts of alanine, 10 parts of tyrosine, 5 parts of tryptophan and 2 parts of phenylalanine;
the composite vitamin comprises the following components in parts by weight: 2 parts of vitamin B1, 2 parts of vitamin B2, 2 parts of vitamin B9, 2 parts of vitamin B12, 10 parts of vitamin C, 10 parts of nicotinic acid and 10 parts of nicotinamide;
the inorganic salt comprises the following components in parts by weight: 2 parts of calcium citrate, 2 parts of zinc gluconate and 30 parts of potassium nitrite;
the trace elements comprise the following components in parts by weight: 10 parts of tungsten diselenide and 5 parts of potassium iodide.
The activating supplement formula comprises the following components in percentage by weight: 20% of compound vitamin, 50% of inorganic salt and 30% of trace elements;
the composite vitamin comprises the following components in parts by weight: 2 parts of vitamin B1, 2 parts of vitamin B2, 2 parts of vitamin B9, 2 parts of vitamin B12, 10 parts of vitamin C, 10 parts of nicotinic acid and 10 parts of nicotinamide;
the inorganic salt comprises the following components in parts by weight: 2 parts of calcium citrate, 2 parts of zinc gluconate and 30 parts of potassium nitrite;
the trace elements comprise the following components in parts by weight: 10 parts of tungsten diselenide and 5 parts of potassium iodide.
The methane concentration distribution data in the off-gas are shown in table 2 (in mg/m):
TABLE 2
Figure 534523DEST_PATH_IMAGE002
As can be seen from Table 2, the bioactivator of the present invention produced a significant decrease in methane concentration after use.
The oxygen concentration distribution of the waste water and gas treatment system of the present invention is shown in Table 3 (unit%), and the dissolved oxygen concentration after aeration is shown in Table 4 (unit: mg/L):
TABLE 3
Analysis of Sampling location
First analysis Adjusting tank 20.92
Air floatation tank 20.98
First-level oxygen consumption pool 19.57
Second analysis Adjusting tank 21.03
Air floatation tank 20.95
Peculiar smell processing apparatus discharge port 20.81
Third analysis Anaerobic tank 20.89
First-stage oxygen consumption pool 19.42
Two-stage oxygen consumption pool 20.03
Fourth analysis Air floatation tank 20.66
Adjusting tank 20.94
Peculiar smell processing apparatus discharge port 21.02
TABLE 4
Figure 251943DEST_PATH_IMAGE003
Table 3 shows that the oxygen concentration distribution in the exhaust gas is about 20% and the lowest 19.42%, and tables 3 and 4 show that the invention can meet the biochemical reaction requirement of wastewater treatment and purification by using the exhaust gas as the aeration gas source, and the oxygen concentration of the exhaust outlet of the odor treatment device can reach 21.02%.
Comparative example 1:
as shown in fig. 2, the wastewater and waste gas treatment system for sewage plants comprises a wastewater collection tank 1, a regulating tank 3, an air flotation tank 5, an anaerobic tank 6, a primary oxygen consumption tank 7, a secondary oxygen consumption tank 8, a secondary sedimentation tank 9, an ozone catalytic reaction tank 21, a sludge concentration tank 10, an odor treatment device 14, a primary oxygen consumption centrifugal fan 17 and a secondary oxygen consumption centrifugal fan 20, which are sequentially connected through a water pipeline; the sludge outlet of the regulating tank 3, the sludge outlet of the air flotation tank 5, the sludge outlet of the anaerobic tank 6, the sludge outlet of the primary oxygen consumption tank 7, the sludge outlet of the secondary aerobic tank 8 and the sludge outlet of the secondary sedimentation tank 9 are respectively merged into an inlet pipeline of the sludge concentration tank 10 through pipelines, the primary oxygen consumption centrifugal fan 17 is connected with an aeration pipeline of the primary oxygen consumption tank 7, and the secondary oxygen consumption centrifugal fan 20 is connected with an aeration pipeline of the secondary oxygen consumption tank 8;
the waste water collecting tank 1, the regulating tank 3, the air flotation tank 5, the anaerobic tank 6, the primary oxygen consumption tank 7, the secondary oxygen consumption tank 8, the secondary sedimentation tank 9 and the sludge concentration tank 10 are respectively collected and merged into a main pipeline of an air inlet of the peculiar smell processing device 14 through a peculiar smell collecting cover and a pipeline, and the peculiar smell is discharged after being processed by the peculiar smell processing device 14;
all the waste water is collected into a waste water collecting tank 1, pretreated by a regulating tank 3 and an air floatation tank 5, and then sequentially enters an anaerobic tank 6, a primary oxygen consumption tank 7, a secondary oxygen consumption tank 8, a secondary sedimentation tank 9 and an ozone catalytic reaction tank 21 for treatment and then is discharged after reaching the standard; the sludge recovered by the sludge concentration tank 10 is dewatered and then discharged as dry sludge.
The primary oxygen consumption centrifugal fan 17 sucks fresh air to supply low-pressure aeration air to the primary oxygen consumption tank 7, and the secondary oxygen consumption centrifugal fan 20 sucks fresh air to supply low-pressure aeration air to the secondary aerobic tank 8.
The odor treatment device 14 uses fresh living water as make-up water. Comparative example 1 odor component and concentration detection results of the discharge port of the odor treatment apparatus are shown in table 5 (unit: mg/m) 3 ）
TABLE 5
Figure 581906DEST_PATH_IMAGE004
Table 6 shows the results of measuring the odor components and concentrations at the discharge port of the odor treatment apparatus according to example 1 of the present invention.
TABLE 6
Figure 333961DEST_PATH_IMAGE005
The results of measuring the odor components and the concentrations of the odor components in the waste water and gas treatment system in example 1 of the present invention are shown in tables 7 and 8, (unit: mg/m) 3 ）。
TABLE 7
Figure 94107DEST_PATH_IMAGE006
TABLE 8
Figure 298823DEST_PATH_IMAGE007
The detection result shows that the invention can obviously reduce the peculiar smell component in the exhaust emission and greatly reduce the peculiar smell concentration.
The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to be limiting in any way, and other variations and modifications are possible without departing from the scope of the invention as set forth in the appended claims.

Claims (10)

1. The utility model provides a sewage plant waste water exhaust-gas treatment system which characterized in that: the system comprises a wastewater collection tank, a first catalytic system, a regulating tank, a second catalytic system, an air flotation tank, an anaerobic tank, a first-stage oxygen consumption tank, a second-stage oxygen consumption tank and a secondary sedimentation tank which are sequentially connected through a water pipeline, and further comprises a sludge concentration tank, a third catalytic system, a fourth catalytic system, a fifth catalytic system, a peculiar smell treatment device, a first dewatering purifier, a first induced draft fan, a first-stage oxygen consumption centrifugal fan, a second dewatering purifier, a second induced draft fan and a second-stage oxygen consumption centrifugal fan; the adjusting tank sludge outlet, the air flotation tank sludge outlet, the anaerobic tank sludge outlet, the primary oxygen consumption tank sludge outlet, the secondary aerobic tank sludge outlet and the secondary sedimentation tank sludge outlet are respectively connected into a sludge concentration tank inlet pipeline through pipelines; the primary oxygen consumption tank is provided with a first circulating water pipeline, the first circulating water pipeline is connected with a third catalytic system, the outlet of the first circulating water pipeline is connected into the water inlet pipeline of the primary oxygen consumption tank, the secondary oxygen consumption tank is provided with a second circulating water pipeline, and the second circulating water pipeline is connected with a fourth catalytic system;
the waste water collecting tank waste gas, the adjusting tank waste gas, the air flotation tank waste gas, the anaerobic tank waste gas and the sludge concentration tank waste gas are respectively merged into a first dewatering purifier inlet pipeline through pipelines, a first dewatering purifier outlet is sequentially connected with a first induced draft fan and a first-stage oxygen consumption centrifugal fan through pipelines, a first-stage oxygen consumption centrifugal fan outlet is connected with a first-stage oxygen consumption tank aeration head through pipelines, the first-stage oxygen consumption tank waste gas is connected with a second dewatering purifier inlet through pipelines, a second dewatering purifier outlet is sequentially connected with a second induced draft fan and a second-stage oxygen consumption centrifugal fan through pipelines, a second-stage oxygen consumption centrifugal fan outlet is connected with a second-stage oxygen consumption tank aeration head through pipelines, the second-stage oxygen consumption tank waste gas and the second sedimentation tank waste gas are respectively merged into a gas inlet main pipeline of the odor treatment device through pipelines, the odor treatment device is provided with a third circulating water pipeline, and the third circulating water pipeline is connected with a fifth catalytic system;
the catalyst is arranged in the first catalytic system, the second catalytic system, the third catalytic system, the fourth catalytic system and the fifth catalytic system, is a fixed bed heterogeneous catalyst and comprises the following metal components in percentage by mass: 5-10% of Au, 5-15% of Pu, 1-2% of Co, 5-20% of Pt, 5-10% of Os, 5-10% of Pd, 5-10% of Ru, 5-20% of Ti, 5-10% of Rh, 5-10% of Ta, 0.05-1% of Y, 0.5-1% of Sm0.5, 0.5-1% of Nd, 5-10% of Ce, 5-10% of La, 1-5% of Fe, 1-5% of Zn, 5-10% of Ca and 5-10% of Ni.
2. The sewage plant wastewater and exhaust gas treatment system according to claim 1, wherein the catalyst is prepared by the following steps:
after surface treatment, soaking the ceramic structured packing in a mixed solution of organic metal salt, shaking for 3-5 times after soaking, instantly extracting the liquid level, draining for 30min, drying at 105 ℃, and then drying and calcining the soaked and dried ceramic structured packing for multiple times;
wherein the organic metal salt solution is metal citrate, metal amino acid salt or metal gluconate, and the metal species is Au, pu, co, pt, os, pd, ru, ti, rh, ta, Y, sm, nd, ce, la, fe, zn, ca, ni;
the concentration of the organic metal salt solution is 3-5wt.%;
the calcination conditions were: heating to 105 ℃ at the speed of 15 ℃/h for 4h, slowly heating to 250 ℃ at the speed of 5 ℃/h for 10h, then slowly heating to 650 ℃ at the speed of 5 ℃/h for 4h, and calcining for 5 times.
3. The sewage plant wastewater and exhaust gas treatment system according to claim 1, wherein: still include ozone catalytic reaction pond, two heavy pond delivery ports pass through the water inlet of pipe connection ozone catalytic reaction pond, ozone catalytic reaction pond waste gas merges peculiar smell processing apparatus income gas port main line through the pipeline, be equipped with the line mixer on the main line.
4. The sewage plant wastewater and exhaust gas treatment system according to claim 1, wherein: and a multi-stage catalyst layer is arranged in the first catalytic system.
5. A method for treating wastewater and waste gas of a sewage plant is characterized by comprising the following steps:
1) The wastewater collection tank collects wastewater of a sewage plant, the wastewater is pumped into a first catalytic system, a regulating tank, a second catalytic system, an air floatation tank and an anaerobic tank by a pump in sequence through pipelines for wastewater treatment, and methane gas carried in the wastewater in the first catalytic system and the second catalytic system is catalytically degraded;
2) Pumping the wastewater after anaerobic treatment into a primary oxygen consumption tank by a pump for wastewater treatment, pumping 1/2 volume of the wastewater after treatment into a secondary oxygen consumption tank, taking 1/2 volume of the wastewater as nitrate state liquid for internal reflux, pumping 1/3 volume of internal reflux liquid into a third catalytic system by a circulating pump, catalytically degrading methane gas carried in the wastewater in the third catalytic system, feeding the rest of the internal reflux liquid into an anaerobic tank, dewatering waste gas generated by a wastewater collection tank, a regulating tank, an air flotation tank, the anaerobic tank and a sludge concentration tank by a first dewatering purifier, and then sequentially entering an aeration head of the primary oxygen consumption tank for an aeration gas source by a first induced draft fan and a primary oxygen consumption centrifugal fan;
3) 1/2 volume of wastewater enters a secondary sedimentation tank after wastewater treatment in a secondary oxygen consumption tank, 1/2 volume of wastewater is taken as nitrate state liquid to carry out internal reflux, 3/4 volume of internal reflux liquid is pumped into a fourth catalytic system through a circulating pump, methane gas carried in the wastewater is catalytically degraded in the fourth catalytic system, the rest internal reflux liquid enters a primary oxygen consumption tank, and waste gas generated by the primary oxygen consumption tank is dewatered through a second dewatering purifier and then sequentially enters an aeration head of the secondary oxygen consumption tank through a second induced draft fan and a secondary oxygen consumption centrifugal fan to be used as an aeration gas source;
4) The waste water in the secondary sedimentation tank enters an ozone catalytic reaction tank after being treated, the waste water in the ozone catalytic reaction tank is discharged after reaching the standard after being treated, ozone tail gas generated by the ozone catalytic reaction tank is mixed with a secondary oxygen consumption tank and waste gas generated by the secondary sedimentation tank in a pipeline mixer and then enters an odor treatment device for waste gas treatment, the ozone in the odor treatment device reacts with organic gas in the waste gas to remove the ozone, the recycled waste water is used as circulating make-up water of the odor treatment device, water carrying the waste gas in the odor treatment device is pumped into a fifth catalytic system through a circulating pump, methane gas carried in the waste water is catalytically degraded in the fifth catalytic system, and the waste gas is discharged after reaching the standard;
5) And sludge generated by the regulating tank, sludge generated by the air flotation tank, sludge generated by the anaerobic tank, sludge generated by the primary oxygen consumption tank, sludge generated by the secondary aerobic tank and sludge generated by the secondary sedimentation tank respectively enter a sludge concentration tank to be concentrated and then are discharged as dry sludge.
6. The method for treating wastewater and exhaust gas of a sewage plant according to claim 5, wherein: after the wastewater in the step 1) enters an anaerobic tank, adding a biological activator into the anaerobic tank every day to domesticate methane biological purification dominant bacteria capable of phagocytosing methane, wherein the domestication period is 30 days, and the dissolved oxygen concentration of the anaerobic tank is controlled to be 0.5 +/-0.1 mg/L.
7. The method for treating wastewater and waste gas from a sewage plant according to claim 6, wherein: in the step 4), adding a biological activator into the peculiar smell treatment device every day, wherein the acclimation period is 30 days.
8. The method for treating wastewater and exhaust gas of a sewage plant according to claim 7, wherein: the biological activator comprises the following components in percentage by weight: 15 to 30 percent of amino acid, 10 to 20 percent of compound vitamin, 20 to 40 percent of inorganic salt and 10 to 40 percent of trace element;
the amino acid comprises the following components in parts by weight: 1 to 5 parts of alanine, 10 to 15 parts of tyrosine, 1 to 5 parts of tryptophan and 2 to 10 parts of phenylalanine;
the composite vitamin comprises the following components in parts by weight: 1 to 5 parts of vitamin B1, 1 to 5 parts of vitamin B2, 1 to 5 parts of vitamin B9, 1 to 5 parts of vitamin B12, 10 to 15 parts of vitamin C, 10 to 15 parts of nicotinic acid and 10 to 15 parts of nicotinamide;
the inorganic salt comprises the following components in parts by weight: 1 to 5 parts of calcium citrate, 1 to 5 parts of zinc gluconate and 20 to 35 parts of potassium nitrite;
the trace elements comprise the following components in parts by weight: 10 to 20 parts of tungsten diselenide and 1 to 5 parts of potassium iodide.
9. The method for treating wastewater and exhaust gas of a sewage plant according to claim 7, wherein: the mass-volume ratio of the biological activating agent added to the sewage treatment capacity of the sewage plant every day in the anaerobic tank is 1g 3 The mass-volume ratio of the biological activator added by the peculiar smell treatment device every day to the daily sewage treatment capacity of a sewage plant is 1g 3 。
10. The method for treating wastewater and exhaust gas of a sewage plant according to claim 7, wherein: the adding port of the anaerobic tank and the adding port of the peculiar smell treatment device are supplemented with an activated supplement after a biological activator is added, the adding mass ratio of the activated supplement to the biological activator is 1-5, and the activated supplement comprises the following components in percentage by weight: 20 to 30 percent of compound vitamin, 30 to 50 percent of inorganic salt and 30 to 50 percent of trace element;
the composite vitamin comprises the following components in parts by weight: 1 to 5 parts of vitamin B1, 1 to 5 parts of vitamin B2, 1 to 5 parts of vitamin B9, 1 to 5 parts of vitamin B12, 10 to 15 parts of vitamin C, 10 to 15 parts of nicotinic acid and 10 to 15 parts of nicotinamide;
the inorganic salt comprises the following components in parts by weight: 1 to 5 parts of calcium citrate, 1 to 5 parts of zinc gluconate and 20 to 35 parts of potassium nitrite;
the trace elements comprise the following components in parts by weight: 10 to 20 parts of tungsten diselenide and 1 to 5 parts of potassium iodide.
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