CN108264203B - System and method for treating odor of papermaking wastewater - Google Patents

System and method for treating odor of papermaking wastewater Download PDF

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CN108264203B
CN108264203B CN201810300934.5A CN201810300934A CN108264203B CN 108264203 B CN108264203 B CN 108264203B CN 201810300934 A CN201810300934 A CN 201810300934A CN 108264203 B CN108264203 B CN 108264203B
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tank
tower
biological
filler
odor
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CN108264203A (en
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谭拥军
赵会芳
马晓鸣
徐根林
徐强
陆祥根
陈建东
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Zhejiang Rongsheng Paper Industry Holding Co ltd
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Zhejiang Rongsheng Paper Industry Holding Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water or sewage
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/84Biological processes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/84Biological processes
    • B01D53/85Biological processes with gas-solid contact
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/95Specific microorganisms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2253/00Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10Inorganic adsorbents
    • B01D2253/102Carbon
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/30Sulfur compounds
    • B01D2257/304Hydrogen sulfide
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/30Sulfur compounds
    • B01D2257/306Organic sulfur compounds, e.g. mercaptans
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/40Nitrogen compounds
    • B01D2257/406Ammonia
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/24Treatment of water, waste water, or sewage by flotation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/122Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/26Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
    • C02F2103/28Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/02Odour removal or prevention of malodour
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/30Fuel from waste, e.g. synthetic alcohol or diesel

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Biomedical Technology (AREA)
  • Health & Medical Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
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  • Molecular Biology (AREA)
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  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Treating Waste Gases (AREA)
  • Activated Sludge Processes (AREA)

Abstract

The invention relates to a system and a method for treating odor of papermaking wastewater. The system comprises an inclined screen, a pretreatment unit, an anaerobic tower, an aeration tank, a secondary sedimentation tank and a sludge press filtration unit which are sequentially connected through pipelines, and also comprises a multilayer filler biological spray tower and an activated carbon adsorption device which are connected through pipelines; the inclined screen, the pretreatment unit, the anaerobic tower, the aeration tank, the secondary sedimentation tank and the sludge press filtration unit are all connected with the multilayer filler biological spray tower through pipelines, and the pretreatment unit comprises an air floatation tank and an acidification tank which are sequentially connected through pipelines. The invention combines the points and the surfaces, fully collects the wastewater, and fully seals and collects the wastewater passing through inclined sieves, an air floatation tank, an acidification tank, an anaerobic tower, an aeration tank, a secondary sedimentation tank and sludge treatment equipment, so that the wastewater does not leak, and the removal rate of malodorous gas in the papermaking wastewater is more than 99 percent. In addition, the invention adopts single tower biochemical treatment, has less equipment investment and low operation cost.

Description

System and method for treating odor of papermaking wastewater
Technical field:
the invention relates to the technical field of odor treatment, in particular to a system and a method for treating odor of papermaking wastewater.
The background technology is as follows:
because of the high concentration property of the waste paper making waste water, the anaerobic-aerobic biotechnology is widely applied to the field of waste paper making waste water treatment. Odor can be generated in the treatment process of high-concentration papermaking wastewater, particularly a large amount of odor is generated in the anaerobic stage, and the odor is mainly H 2 S、NH 3 Methyl mercaptan, methyl sulfide, amines, etc., wherein H 2 S and NH 3 The content is more. In the anaerobic hydrolysis section of sewage treatment, macromolecular or granular organic matters are decomposed into volatile low-molecular organic matters VOCs, and SO (sulfur dioxide) rich in papermaking wastewater 4 2- Is reduced to H 2 S, the organic amine is decomposed into ammonia gas, and the components of the waste gas are released into the air to form malodorous gas. Also, the sludge generated in the wastewater treatment process can generate odor during treatment. The odor components and concentrations produced vary with the treatment process of the sewage and sludge. As many facilities for sewage treatment of paper enterprises in China such as inclined screens, primary sedimentation tanks, aeration tanks, secondary sedimentation tanks, sludge treatment equipment and the like are all of open structures, malodorous gas can be directly emitted, and the sewage treatment equipment belongs to non-tissue non-point source emission.
The prior art has few applications in deodorizing high-concentration papermaking wastewater, and wastewater odor of most paper mills is discharged unorganized. Very few waste water from paper mill is imperfect to treat odor by the prior art, and generally has low treatment efficiency and is difficult to discharge after reaching standards. The odor in the wastewater treatment process causes great corrosion to some exposed mechanical equipment, shortens the service life of the equipment and causes economic loss. Meanwhile, malodor is one of six public hazards which pollute the environment and harm human health. Wherein H is 2 S is the smell of smelly eggs, has extremely toxic and perceived human quantity of 0.00037mg/m 3 Containing 0.1% H 2 The gas of S can poison the human body,higher concentrations of hydrogen sulfide can be fatal in a short period of time. NH (NH) 3 Methyl mercaptan is a cabbage rot odor and other sulfur-containing organic compounds are rot or unpleasant malodour, which is a strong pungent odor. The malodorous gases pose a great threat to the personal health of staff in the factory; meanwhile, the odor emitted in the atmosphere also tends to influence surrounding areas, and the odor is harmful to the respiratory system, the digestive system, the circulatory system, the nervous system and the like of human bodies, directly affects the health and living standard of people, and seriously interferes with the daily life of surrounding residents. With the development of paper-making enterprises, odor pollution is continuously aggravated, and becomes an important object of complaints and complaints of peripheral people, and social conflict is caused when serious, so that social harmony is affected to a certain extent.
At present, the odor treatment methods generated in the wastewater treatment process mainly comprise a water washing method, an active carbon adsorption method, an ozone oxidation method, a deodorizing solution deodorizing method, an ion deodorizing method, a chemical washing method, a biological deodorizing method and the like.
The water washing method uses the characteristic that the main substances in the odor are soluble in water to make H in the odor 2 S、NH 3 The air contacts and dissolves with water to achieve the aim of deodorization, and the water consumption is large and the efficiency is low.
The activated carbon adsorption method is to use the physical adsorption effect of activated carbon to the odor to deodorize. Its advantages are simple process, low concentration of odor, and high investment and running cost.
The ozone oxidation method is to oxidize chemical components in the odor by utilizing the strong oxidizing property of ozone so as to achieve the aim of deodorization. The ozone oxidation method has a gas phase and a liquid phase, and most of the odor-causing substances are removed by a liquid medicine cleaning method and then ozone oxidation is performed because the chemical reaction of ozone is slow.
Deodorizing solution deodorizing is a method of masking and neutralizing unpleasant odors by using a strong odor gas that people can accept. The method has the main advantages of simplicity, low investment and quick response. The disadvantage is that it is difficult to completely change the odor components, and there is still a possibility of some degree of damage to people, livestock, equipment, the environment, etc.
The ion deodorization method is to generate high-density high-energy active ions by using high-frequency high-voltage electrostatic special pulse discharge to make the high-density high-energy active ions contact with odor to break chemical bonds of odor molecules and decompose the odor molecules into low-molecular odorless substances, so that the purpose of purifying gas is achieved. The method has the advantages of relatively small volume, light weight, suitability for compact arrangement, narrow field and the like, but high one-time investment cost and high operation and maintenance cost.
The chemical washing method is a method of removing odor by using chemical agents and odor to generate chemical products having no odor or low odor through chemical reaction. Such as with chemical media (NaOH, naClO or H 2 O 2 ) And H is 2 S and other substances perform three-stage reaction, thereby achieving the aim of deodorization. The method has the advantages of changing the components of the odor, reducing the damage degree of the odor to people, livestock, equipment, environment and the like, and has the defects of large investment and relatively high operation cost, and particularly has the possibility and tendency of causing new environmental pollution to the products after chemical reaction, and the chemical products after washing need to be strictly treated.
The biological deodorization method is an odor treatment method developed in the later 50 s of the 20 th century. The odor biological purification principle is that pollutants in the waste gas are converted into simple inorganic matters (carbon dioxide, water and sulfate radical) and cell matters of microorganisms in the metabolism process by microorganisms attached to the filler in the reactor, wherein the volatile organic pollutants in the waste gas are decomposed into carbon dioxide, water and other simple inorganic matters; the sulfides in sulfur-containing malodorous contaminants are converted to more environmentally stable sulfates and the nitrogen-containing compounds are converted to nitrates or nitrogen. Compared with the traditional treatment method, the biological deodorization method has the characteristics of high treatment efficiency, low operation cost and no secondary pollution. However, there are problems in that, for example, a double column combination is generally required for the bio-filtration and bio-washing method, the main function of the absorption column is to transfer the main component of the malodor into the liquid phase, thereby achieving a mass transfer process, and then the part of the wastewater having absorbed the malodor component is treated by the metabolism of microorganisms by the activated sludge method, which is relatively high in investment, and which adopts an organic filler or an inorganic filler as a carrier of microorganisms to decompose the malodor. Because a single filler often cannot form an ideal microbiota, the adaptability of the filler to different odors can be influenced, and the deodorizing efficiency of the filler is influenced; the biological trickling filtration method is generally of a single tower structure, but nutrient solution is required to be supplemented in operation, and circulating solution is required to be discharged and treated regularly; the spray liquid is water without deodorizing function, so the efficiency is still to be further improved. In addition, there are, for example, cultivation of deodorizing microorganisms, screening of strains, treatment of mixed malodorous gas, optimization of process parameters of deodorizing equipment, and the like.
Therefore, it is desirable to provide a more suitable system and method for treating the odor of the papermaking wastewater to solve the above problems.
The invention comprises the following steps:
the invention aims to provide a system and a method for treating odor of papermaking wastewater, which are used for realizing point-surface combination and comprehensive collection of the odor of the papermaking wastewater, and realizing totally-closed collection of inclined sieves, pretreatment units, anaerobic towers, aeration tanks, secondary sedimentation tanks and sludge treatment equipment for the wastewater without leakage.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a papermaking wastewater odor treatment system, which comprises: the device comprises a inclined screen, a pretreatment unit, an anaerobic tower, an aeration tank, a secondary sedimentation tank and a sludge press filtration unit which are sequentially connected through pipelines, and also comprises a multilayer filler biological spray tower and an activated carbon adsorption device which are connected through pipelines; the inclined screen, the pretreatment unit, the anaerobic tower, the aeration tank, the secondary sedimentation tank and the sludge press filtration unit are all connected with the multilayer filler biological spray tower through pipelines, and the pretreatment unit comprises an air floatation tank and an acidification tank which are sequentially connected through pipelines.
And sealing the top of the anaerobic tower.
And the air floatation tank, the acidification tank, the aeration tank and the secondary sedimentation tank in the pretreatment unit are all subjected to sealing treatment.
The mesh opening of the inclined screen is 120-150 meshes, and the inclined screen is subjected to sealing treatment.
And the whole workshop for the sludge filter pressing operation is subjected to sealing treatment.
A plurality of spray heads are arranged above the multilayer filler biological spray tower, biological spray liquid is circularly fed into the spray heads through pipelines, and a circulating metering pump is arranged on the pipeline connected with the spray heads.
The biological spray liquid is prepared by compounding plant extracts and chitosan, wherein the plant extracts are any three or more than three plant extracts of ginkgo leaf, tea, bamboo, camphor tree leaf and pine.
The circulation volume of the biological spray liquid is 20-30 m 3 And/h, supplementing every 5-10 days.
The multi-layer filler biological spray tower is characterized in that the filler adopted by the multi-layer filler biological spray tower comprises a pall ring, a Raschig ring and biological filler which are arranged in a multi-stage mode, the three fillers are combined in the tower and are arranged in two layers, and the total height of the two layers is 1-2 m.
The biological filler is prepared from bamboo charcoal, charcoal and waste fibrilia according to a mass ratio of 1:0.3 to 0.5:0.3 to 0.5.
And in the first filler layer, the height ratio of pall ring, raschig ring and biological filler is 1: 1-2: 1-2, in the second layer of filler, the height ratio of pall ring, raschig ring and biological filler is 1:0.5 to 1:2 to 3.
The working temperature of the multilayer filler biological spray tower is 30-40 ℃, the pH value is 1.2-2.0, and the gas residence time is 8-12 seconds.
The activated carbon in the activated carbon adsorption device is made of coconut shell activated carbon, the average particle diameter is 8-10 meshes, the layer height is 1-2 m, the replacement period is 5-10 months, and the gas residence time is 8-12 seconds.
The method for treating the odor of the papermaking wastewater by adopting the system for treating the odor of the papermaking wastewater comprises the following specific steps:
firstly, recycling fine fibers in papermaking wastewater through an inclined screen; then pretreating papermaking wastewater through a pretreatment unit; treating reducing substances in the papermaking wastewater by using a UMIC anaerobic treatment system adopted by an anaerobic tower; performing aeration aerobic treatment on papermaking wastewater in an aeration tank by adopting an activated sludge process; recycling or discharging the water precipitated by the secondary sedimentation tank; the sludge generated after treatment is comprehensively utilized after filter pressing; odor generated in the treatment process of the inclined screen, the pretreatment unit, the anaerobic tower, the aeration tank, the secondary sedimentation tank and the sludge press filtration unit is led into the multilayer filler biological spray tower for primary deodorization, and is discharged after reaching the standard after the primary deodorization of the multilayer filler biological spray tower and the secondary deodorization of the activated carbon adsorption device.
The preparation method of the biological spray liquid adopted in the multilayer-filler biological spray tower comprises the following steps: firstly stirring and dissolving the powdery plant extract by using clear water, and then preparing the biological spray liquid with the concentration of 0.3-0.5% in a circulating water tank, wherein the stirring speed is 300-500 rpm, the dissolving temperature is 20-40 ℃, and the stirring time is 10-30 min.
Further, the pretreatment process in the technical scheme specifically comprises the following steps: firstly, carrying out preliminary treatment on wastewater by using an air floatation tank to remove most suspended matters; then pre-acidification treatment is carried out by an acidification tank, the residence time of pre-acidification wastewater is 4-5 hours, the pH value is 6.5-7.5, and the pre-acidification degree is 40-50%.
The system and the method for treating the odor of the papermaking wastewater have the beneficial effects that:
aiming at the problems that the prior art cannot realize point-surface combination and comprehensive collection, so that the problems of point drainage and papermaking odor pollution still remain, the invention realizes the point-surface combination and the comprehensive collection, and realizes the totally-closed collection of inclined sieves, pretreatment units, anaerobic towers, aeration tanks, secondary sedimentation tanks and sludge treatment equipment for wastewater to be passed through without leakage;
the technology of combining biological spray deodorization and microbial decomposition deodorization is adopted, the odor absorption and decomposition processes can be completed in one tower, double-tower integration is realized, the structure is very compact, and the investment is low. The invention adopts the biological spray liquid prepared by the plant extract to circularly spray the odor, the biological spray liquid can rapidly absorb the odor gases such as hydrogen sulfide, methyl mercaptan, ammonia gas and the like, and the reactions such as polymerization, substitution, replacement, adsorption and the like are carried out, so that the molecular structure of the original odor of the polluted gas is changed, the original odor is changed into nontoxic and odorless molecules,thereby achieving the deodorizing effect. The biological spray liquid is used as a microorganism supply source at the same time, and the microorganism is promoted to grow on the filler in the cyclic spray process, and the metabolism of the microorganism is utilized to decompose H 2 S、NH 3 And the odor is equal, so that the combination of biological spray deodorization and microbial decomposition deodorization is realized, and compared with a biological deodorization system adopting clear water spray, the biological deodorization system has higher deodorization efficiency. In addition, the biological spray liquid also plays a role in providing a microbial nutrient source, so that the invention does not need to provide additional nutrient liquid, does not need to regularly discharge circulating liquid, and also reduces the burden of wastewater treatment;
meanwhile, pall rings, raschig rings and independently developed biological fillers are used as carriers of microorganisms, multiple fillers are combined and arranged in a tower in multiple layers, the advantages of the various fillers are fully exerted, multiple types of microorganism groups can be formed on the fillers, adaptability to different odor is improved, and therefore removal efficiency is effectively improved;
biological spraying and activated carbon adsorption secondary deodorization technologies are adopted, and related reports on deodorization of domestic papermaking wastewater are not yet seen. Biological spraying can realize most of H 2 S、NH 3 The technology has the advantages that the combined treatment efficiency is high, the removal effect is obvious, the removal rate of main malodorous gas reaches more than 99%, and the exhaust gas reaches the secondary emission standard of malodorous pollutant emission standard (GB 14554-93). The secondary deodorization technology of the invention does not use harmful chemical agents, has low energy requirement, does not produce secondary pollutants, and the final product is benign, thus being a truly green deodorization method for high-concentration papermaking wastewater;
the single-tower biochemical treatment is adopted, the equipment investment is low, the nutrient solution is not required to be supplemented in the system operation, the circulating solution is not discharged, the operation cost is low, the deodorizing efficiency is high, and the problems of equipment corrosion, harm to human health and surrounding environment and pollution are solved.
Description of the drawings:
FIG. 1 is a block diagram of a system for treating odor of papermaking wastewater according to the present invention;
in the figure: 1-inclined screen, 2-pretreatment unit, 3-anaerobic tower, 4-aeration tank, 5-secondary sedimentation tank, 6-sludge press filtration unit, 7-multilayer filler biological spray tower, 8-active carbon adsorption device and 9-pipeline.
The specific embodiment is as follows:
the following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
According to FIG. 1, the system for treating odor of papermaking wastewater provided by the invention comprises: the device comprises a inclined screen 1, a pretreatment unit 2, an anaerobic tower 3, an aeration tank 4, a secondary sedimentation tank 5 and a sludge press filtration unit 6 which are sequentially connected through a pipeline 9, and also comprises a multilayer filler biological spray tower 7 and an activated carbon adsorption device 8 which are connected through the pipeline 9; the inclined screen 1, the pretreatment unit 2, the anaerobic tower 3, the aeration tank 4, the secondary sedimentation tank 5 and the sludge press filtration unit 6 are all connected with the multilayer filler biological spray tower 7 through pipelines 9, the pretreatment unit 2 comprises an air flotation tank and an acidification tank which are sequentially connected through the pipelines 9, the top of the anaerobic tower 3 is subjected to sealing treatment, the air flotation tank, the acidification tank, the aeration tank 4 and the tank surface of the secondary sedimentation tank 5 in the pretreatment unit 2 are subjected to sealing treatment, the mesh opening of the inclined screen 1 is 120-150 meshes, the inclined screen 1 is subjected to sealing treatment, and the whole workshop of the sludge press filtration unit 6 is subjected to sealing treatment, so that the inclined screen 1, the pretreatment unit 2, the anaerobic tower 3, the aeration tank 4, the secondary sedimentation tank 5 and the sludge press filtration unit 6 through which waste water passes can be subjected to point-surface combination and comprehensive collection, and no leakage can be realized.
Further, in the above technical scheme, a plurality of spray heads are arranged above the multilayer-filler biological spray tower 7, biological spray liquid is circularly fed into the spray heads through a pipeline 9, and a circulation metering pump is arranged on the pipeline 9 connected with the spray heads.
Further, in the technical scheme, the biological spray liquid is prepared by compounding 3-5 plant extracts and chitosan, wherein the plant extracts are any three or more than three plant extracts of ginkgo leaf, tea, bamboo, camphor tree leaf and pine; when spraying is actually carried out, the circulation quantity of the biological spraying liquid is 20-30 m 3 And/h, and supplementing every 5-10 days.
Further, the packing adopted in the multi-layer packing biological spray tower 7 in the above technical scheme includes pall rings, raschig rings and biological packing which are arranged in multiple stages, the three kinds of packing are combined in the tower and are arranged in two layers, the total height of the two layers is 1-2 m, and in the first packing layer, the height ratio of pall rings, raschig rings and biological packing is 1: 1-2: 1-2, in the second layer of filler, the height ratio of pall ring, raschig ring and biological filler is 1:0.5 to 1: 2-3, and further, the biological filler is prepared from bamboo charcoal, charcoal and waste fibrilia according to a mass ratio of 1:0.3 to 0.5:0.3 to 0.5, and the working temperature of the multilayer filler biological spray tower 7 is 30 to 40 ℃, the pH value is 1.2 to 2.0 and the gas residence time is 8 to 12 seconds during actual operation.
Further, in the above technical scheme, the activated carbon in the activated carbon adsorption device 8 is made of coconut shell activated carbon, the average particle diameter is 8-10 meshes, the layer height is 1-2 m, the replacement period is 5-10 months, and the gas residence time is 8-12 seconds.
The method for treating the odor of the papermaking wastewater by adopting the system for treating the odor of the papermaking wastewater comprises the following specific steps:
firstly, recycling fine fibers in papermaking wastewater through an inclined screen 1; then the pretreatment unit 2 is used for pretreating the papermaking wastewater; treating reducing substances in the papermaking wastewater by using a UMIC anaerobic treatment system adopted by the anaerobic tower 3; performing aeration aerobic treatment on papermaking wastewater in an aeration tank 4 by adopting an activated sludge process; recycling or discharging the water precipitated by the secondary sedimentation tank 5; the sludge generated after treatment is comprehensively utilized after being subjected to filter pressing in a sludge filter pressing unit 6; odor generated in the treatment process of the inclined screen 1, the pretreatment unit 2, the anaerobic tower 3, the aeration tank 4, the secondary sedimentation tank 5 and the sludge press filtration unit 6 is led into the multilayer filler biological spray tower 7 for primary deodorization, and is discharged after reaching the standard after secondary deodorization by the activated carbon adsorption device 8 after the primary deodorization by the multilayer filler biological spray tower 7.
The preparation method of the biological spray liquid adopted in the multilayer-filler biological spray tower 7 comprises the following steps: firstly stirring and dissolving the powdery plant extract by using clear water, and then preparing the biological spray liquid with the concentration of 0.3-0.5% in a circulating water tank, wherein the stirring speed is 300-500 rpm, the dissolving temperature is 20-40 ℃, and the stirring time is 10-30 min.
Further, the pretreatment process in the technical scheme specifically comprises the following steps: firstly, carrying out preliminary treatment on wastewater by using an air floatation tank to remove most suspended matters; then pre-acidification treatment is carried out by an acidification tank, the residence time of pre-acidification wastewater is 4-5 hours, the pH value is 6.5-7.5, and the pre-acidification degree is 40-50%.
The invention detects the concentration of the odor after the primary deodorization (namely the odor of the biological spray tower), and the concentration range of the odor of each component is as follows: the concentration of odor molecules is less than or equal to 30mg/L, ammonia is less than or equal to 2mg/L, hydrogen sulfide is less than or equal to 0.1mg/L, and mercaptan is less than or equal to 0.01mg/L.
The odor concentration range of the active carbon adsorption device is that the odor concentration is less than or equal to 25mg/L, the ammonia is less than or equal to 1mg/L, the hydrogen sulfide is less than or equal to 0.05mg/L, the mercaptan is less than or equal to 0.005mg/L, and the deodorizing efficiency is more than 99%.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which are intended to be covered by the scope of the claims.

Claims (7)

1. A system for treating malodor of papermaking wastewater, comprising: the device comprises an inclined screen, a pretreatment unit, an anaerobic tower, an aeration tank, a secondary sedimentation tank and a sludge press filtration unit which are sequentially connected through pipelines, and is characterized in that: the device also comprises a multilayer filler biological spray tower and an activated carbon adsorption device which are connected through a pipeline; the inclined screen, the pretreatment unit, the anaerobic tower, the aeration tank, the secondary sedimentation tank and the sludge press filtration unit are all connected with the multilayer filler biological spray tower through pipelines, and the pretreatment unit comprises an air floatation tank and an acidification tank which are sequentially connected through pipelines;
sealing the top of the anaerobic tower; the air floatation tank, the acidification tank, the aeration tank and the secondary sedimentation tank in the pretreatment unit are all subjected to sealing treatment; the inclined screen is subjected to sealing treatment; the whole workshop of the sludge filter pressing operation is subjected to sealing treatment; a plurality of spray heads are arranged above the multilayer-filler biological spray tower, biological spray liquid is circularly fed into the spray heads through pipelines, and a circulating metering pump is arranged on the pipeline connected with the spray heads;
the biological spray liquid is prepared by compounding plant extracts and chitosan, wherein the plant extracts are any three or more than three plant extracts of ginkgo leaf, tea, bamboo, camphor tree leaf and pine; the circulation volume of the biological spray liquid is 20-30 m 3 And/h, supplementing every 5-10 days;
the multi-layer packing biological spray tower adopts packing comprising multi-stage arranged pall rings, raschig rings and biological packing, wherein the three kinds of packing are combined in the tower and are arranged in two layers, and the total height of the two layers is 1-2 m;
the biological filler is prepared from bamboo charcoal, charcoal and waste fibrilia according to a mass ratio of 1:0.3 to 0.5:0.3 to 0.5.
2. The system for treating odor of papermaking wastewater according to claim 1, wherein: the mesh opening of the inclined screen is 120-150 meshes.
3. The system for treating odor of papermaking wastewater according to claim 1, wherein: in the first filler layer, the height ratio of pall ring, raschig ring and biological filler is 1: 1-2: 1-2, in the second layer of filler, the height ratio of pall ring, raschig ring and biological filler is 1:0.5 to 1:2 to 3.
4. The system for treating odor of papermaking wastewater according to claim 1 or 2, wherein: the working temperature of the multilayer filler biological spray tower is 30-40 ℃, the pH value is 1.2-2.0, and the gas residence time is 8-12 seconds.
5. The system for treating odor of papermaking wastewater according to claim 1 or 2, wherein: the activated carbon in the activated carbon adsorption device is made of coconut shell activated carbon, the average particle diameter is 8-10 meshes, the layer height is 1-2 m, the replacement period is 5-10 months, and the gas residence time is 8-12 seconds.
6. A method for treating paper mill wastewater malodor using the paper mill wastewater malodor treatment system of claim 1 or 2, characterized by: the method comprises the following specific steps:
firstly, recycling fine fibers in papermaking wastewater through an inclined screen; then pretreating papermaking wastewater through a pretreatment unit; treating reducing substances in the papermaking wastewater by using a UMIC anaerobic treatment system adopted by an anaerobic tower; performing aeration aerobic treatment on papermaking wastewater in an aeration tank by adopting an activated sludge process; recycling or discharging the water precipitated by the secondary sedimentation tank; the sludge generated after treatment is comprehensively utilized after filter pressing; the odor generated in the treatment process of the inclined screen, the pretreatment unit, the anaerobic tower, the aeration tank, the secondary sedimentation tank and the sludge press filtration unit is led into the multilayer filler biological spray tower for primary deodorization, and is discharged after reaching the standard after the primary deodorization of the multilayer filler biological spray tower and the secondary deodorization of the activated carbon adsorption device; the preparation method of the biological spray liquid adopted in the multilayer-filler biological spray tower comprises the following steps: firstly stirring and dissolving the powdery plant extract by using clear water, and then preparing the biological spray liquid with the concentration of 0.3-0.5% in a circulating water tank, wherein the stirring speed is 300-500 rpm, the dissolving temperature is 20-40 ℃, and the stirring time is 10-30 min.
7. The method for treating odor of papermaking wastewater according to claim 6, wherein: the pretreatment process specifically comprises the following steps: firstly, carrying out preliminary treatment on wastewater by using an air floatation tank to remove most suspended matters; then pre-acidification treatment is carried out by an acidification tank, the residence time of pre-acidification wastewater is 4-5 hours, the pH value is 6.5-7.5, and the pre-acidification degree is 40-50%.
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CN111330057A (en) * 2020-03-03 2020-06-26 安氧新材料科技(金华)有限公司 Preparation method of liquid deodorant with quick deodorant effect and product thereof
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