CN110981085A - Treatment method and recovery process of alcohol production wastewater - Google Patents
Treatment method and recovery process of alcohol production wastewater Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- 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
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- C—CHEMISTRY; METALLURGY
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- 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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- C—CHEMISTRY; METALLURGY
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1263—Sequencing batch reactors [SBR]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2846—Anaerobic digestion processes using upflow anaerobic sludge blanket [UASB] reactors
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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Abstract
The invention provides a treatment method and a recovery process of alcohol production wastewater, which comprises the following steps: 1) collecting the production wastewater into a temporary storage tank, and uniformly injecting the production wastewater into an adjusting tank; 2) introducing the wastewater in the regulating reservoir into a reaction tank; 3) the wastewater in the reaction tank enters a settling tank for separation, and the wastewater is introduced into an aerobic tank; 4) leading the wastewater in the aerobic tank into a settling tank after passing through a settling tank; 5) pouring the effluent of the settling tank into an air floatation tank; 6) the wastewater after passing through the air flotation tank automatically flows into a water pool; 7) the water in the pool passes through the sand filtering system and then passes through the disinfection tank to obtain the production process water meeting the fermentation production requirement. The method has simple process, can remove suspended matters, COD, BOD5, ammonia nitrogen, total phosphorus, sulfides, volatile phenol and the like in the wastewater, can reduce the waste of production cost in a sludge recycling mode in the treatment process, can basically meet the production requirement of a fermentation process for the quality of the treated water, and has no obvious influence on the quality of an alcohol finished product.
Description
Technical Field
The invention belongs to the field of alcohol production wastewater treatment, and particularly relates to a treatment method and a recovery process of alcohol production wastewater.
Background
In alcohol production, water is an important raw material, in order to save resources and improve the comprehensive utilization rate of resources, China has clear requirements on resource consumption indexes of the alcohol industry, the water intake of general enterprises is more than the index at present, and the method for reducing the water intake is a very important way for improving the repeated utilization rate of water besides processes such as high-concentration fermentation and the like.
The alcohol wastewater is high-concentration organic wastewater, the COD content is as high as 5-7 ten thousand mg/L, and if the alcohol wastewater is directly discharged into the external environment, the water body is eutrophicated seriously to pollute the environment. Water consumption is too high in view of alcohol production. The water saving has strategic significance, not only relieves the contradiction between supply and demand of water resources, relieves the pressure of urban development on the environment, but also reduces the production and operation cost and realizes low sewage discharge.
In the prior art, a large amount of adsorbed sludge and the like are consumed during the treatment of the alcohol wastewater, and the wastewater treatment cost is relatively high.
Disclosure of Invention
The embodiment of the invention aims to provide a treatment method and a recovery process of alcohol production wastewater, aiming at solving the problems of treatment of impurities in the alcohol production wastewater and recycling of wastewater treatment raw materials.
The embodiment of the invention is realized in such a way that the treatment method and the recovery process of the alcohol production wastewater comprise the following steps:
1) collecting the production wastewater into a temporary storage tank, and uniformly injecting the collected production wastewater into an adjusting tank for pH adjustment, nutrient salt addition, sludge backflow and hydrolytic acidification;
2) the regulated wastewater in the regulating tank is uniformly introduced into the bottom of the reaction tank, flows upwards and flows through a sludge bed, and an anaerobic reaction occurs in the process;
3) the wastewater in the reaction tank is treated and then enters a settling tank for separation, the separated sludge is led into a regulating tank for reuse, and the wastewater is led into an aerobic tank for activated sludge sewage treatment in an intermittent aeration mode;
4) leading out sludge after the wastewater in the aerobic tank passes through the sedimentation tank, refluxing into the aerobic tank for recycling, and leading the treated wastewater into a sedimentation tank for further sedimentation and sludge discharge;
5) pouring the effluent of the settling tank into an air floatation tank, separating hydrophobic impurities with relative density close to that of water in the sewage, and simultaneously disinfecting by using chlorine dioxide;
6) the wastewater sterilized by the air flotation tank automatically flows into a pool, and is used for producing process water after being added with make-up water;
7) the water in the pool is further filtered and purified by the sand filtering system and then is further disinfected by the disinfection tank, and the production process water meeting the fermentation production requirement is obtained.
Another object of the embodiment of the present invention is to hydrolyze insoluble organic substances into soluble organic substances and decompose macromolecular substances into micromolecular substances by hydrolysis and acid-producing bacteria in the hydrolysis acidification of the conditioning tank in step 1).
Another object of an embodiment of the present invention is that the concentrated condensate and the fine column waste liquid passing through the cooling column are also injected in step 1).
Another object of an embodiment of the present invention is that the reaction tank in step 2) is a UASB reaction tank.
Another object of the embodiment of the present invention is that the sedimentation tank in step 4) is disposed in the aerobic tank.
Another objective of the present invention is that the aerobic tank is an SBR aerobic tank, and two sets of the aerobic tanks are connected.
Another purpose of the embodiment of the present invention is that the settling tank in step 5) adopts two sets of connected radial flow settling tanks, and the plane of the tank body in the tank adopts a circular and/or square shape.
Another objective of the present invention is to provide a radial settling tank with a central inlet and an outlet.
Another object of the embodiment of the present invention is that the sand filtration system in step 7) uses quartz sand or activated carbon or anthracite or manganese sand.
It is another object of an embodiment of the present invention that the sterilizing tank in step 7) is sterilized using calcium hypochlorite.
The treatment method and the recovery process for the alcohol production wastewater provided by the embodiment of the invention have the following technical effects: the method has simple process, can remove suspended matters, COD, BOD5, ammonia nitrogen, total phosphorus, sulfides, volatile phenol and the like in the wastewater through treatment and processing, can reduce the waste of production cost in a sludge recycling mode in the treatment process, can basically meet the production requirement of a fermentation process by the quality of the finally treated water, and has no obvious influence on the quality of an alcohol finished product.
Drawings
FIG. 1 is a process flow diagram of a treatment method and a recovery process of alcohol production wastewater according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Specific implementations of the present invention are described in detail below with reference to specific embodiments.
As shown in fig. 1, a method for treating alcohol production wastewater and a recycling process provided by an embodiment of the present invention include the following steps:
1) collecting the production wastewater into a temporary storage tank, and uniformly injecting the collected production wastewater into an adjusting tank for pH adjustment, nutrient salt addition, sludge backflow and hydrolytic acidification;
2) the regulated wastewater in the regulating tank is uniformly introduced into the bottom of the reaction tank, flows upwards and flows through a sludge bed, and an anaerobic reaction occurs in the process;
3) the wastewater in the reaction tank is treated and then enters a settling tank for separation, the separated sludge is led into a regulating tank for reuse, and the wastewater is led into an aerobic tank for activated sludge sewage treatment in an intermittent aeration mode;
4) leading out sludge after the wastewater in the aerobic tank passes through the sedimentation tank, refluxing into the aerobic tank for recycling, and leading the treated wastewater into a sedimentation tank for further sedimentation and sludge discharge;
5) pouring the effluent of the settling tank into an air floatation tank, separating hydrophobic impurities with relative density close to that of water in the sewage, and simultaneously disinfecting by using chlorine dioxide;
6) the wastewater sterilized by the air flotation tank automatically flows into a pool, and is used for producing process water after being added with make-up water;
7) the water in the pool is further filtered and purified by the sand filtering system and then is further disinfected by the disinfection tank, and the production process water meeting the fermentation production requirement is obtained.
In a preferred embodiment, the hydrolysis acidification in the regulating tank in the step 1) utilizes hydrolysis and acid-producing bacteria to hydrolyze insoluble organic matters into soluble organic matters and decompose macromolecular substances into small molecular substances. Concentrated steam condensate and refined tower waste liquid which pass through a cooling tower are also injected in the step 1).
In the embodiment of the invention, various production wastewater such as concentrated tank washing water, initial rainwater and the like are collected in the temporary storage tank and then uniformly enter the regulating tank, and concentrated steam condensate and refined tower waste liquid pass through the cooling tower and then enter the regulating tank. The temporary storage pool is two 20m3The iron storage tank is formed, and can play a role in balancing and stabilizing the water inlet temperature, flow and water quality.
In the embodiment of the invention, the amount of the liquid waste of the sperm column known in the material balance process related to each process is preferably 1.72m3The condensate water amount of the concentrated steam is 11.07m3The water amount of the concentration washing tank is 0.80m3H, total discharge of production wastewater is 13.59 m3And h (the initial rainfall amount and the workshop flushing water amount are not considered for the moment), and if the effective volume is 80%, the temporary storage time of the temporary storage pool is about 2.35 h.
In the embodiment of the invention, the hydrolysis acidification is to hydrolyze insoluble organic matters into soluble organic matters by utilizing the functions of hydrolysis and acid-producing bacteria, and macromolecular substances are decomposed into micromolecular substances, so that the biodegradability of the sewage is greatly improved.
In the embodiment of the invention, two 50m temporary storage pools are arranged behind each other3If the effective volume of the adjusting tank is 80%, namely the retention time of the wastewater is 2.94h, the adjusting tank can be used for pH adjustment, nutrient salt addition, sludge backflow and hydrolytic acidification.
In a preferred embodiment, the reaction tank in step 2) is a UASB reaction tank.
In the embodiment of the invention, the UASB (upflow anaerobic sludge blanket) reactor is a high-efficiency anaerobic reactor. Wastewater is uniformly introduced into the bottom of the UASB reaction tank and flows upwards through a sludge bed containing granular sludge or flocculent sludge, and anaerobic reaction occurs during the contact between the wastewater and the sludge.
In the embodiment of the present invention, it is preferable to provide two UASB reaction tanks, wherein the total volume of No. 1 UASB reaction tank is 1500 m3The model is phi 11m multiplied by 12.5m, and the effective volume is 1200 m3(ii) a The total volume of the 2# UASB reaction tank is 6000 m3The model is phi 22m multiplied by 15.5m, and the effective volume is 4800 m3. If calculated according to 80% of the available volume, the total residence time of the two UASB reaction tanks is 18.40 d.
In the embodiment of the invention, the ascending flow rate of the No. 1 UASB reaction tank is as follows: (13.59 + 160) ÷ (5.52 × 3.14) =1.83 m/h; the ascending flow rate of the No. 2 UASB reaction tank is as follows: (13.59 + 250) ÷ (112 × 3.14) =0.69 m/h.
In a preferred embodiment, the sedimentation tank in step 4) is arranged in an aerobic tank. The aerobic tank is an SBR aerobic tank and is provided with two communicated groups.
In the embodiment of the invention, the wastewater passes through a 50m anaerobic sludge blanket (UASB) reaction tank before entering the aerobic tank3The settling tank of (2) is used for settling separation, and if the effective volume is calculated by 80%, the retention time is 2.94 h. The anaerobic sludge coming out of the anaerobic water outlet is settled and separated and then enters the aerobic tank, so that the reaction efficiency of the aerobic tank is improved; meanwhile, partial sludge can be refluxed to the regulating tank to regulate the water quality of the influent water of the UASB anaerobic tank.
In the embodiment of the invention, the aerobic tank is preferably an SBR aerobic tank, which is an activated sludge sewage treatment technology operating in an intermittent aeration mode and is also called a sequencing batch activated sludge process. Different from the traditional sewage treatment process, the SBR technology adopts an operation mode of time division to replace an operation mode of space division, an unstable biochemical reaction to replace a stable biochemical reaction, and a standing ideal precipitate to replace the traditional dynamic precipitate. The SBR aerobic pool has the main characteristics of orderly and intermittent operation in operation, and the core of the SBR technology is an SBR aerobic pool which integrates the functions of homogenization, primary sedimentation, biodegradation, secondary sedimentation and the like in a first pool.
In the embodiment of the invention, the total volume of the aerobic tanks 1# and 2# is 2000m3If the effective volume is 80%, the effective total volume is 3200 m3, and the production wastewater is subjected to anaerobic treatment, flows into the 1# SBR reaction tank, flows into the 2# SBR reaction tank and flows into the sedimentation tank. Namely the total retention time of the SBR aerobic tank is 9.81 days.
In the embodiment of the invention, in the actual production operation process, an enterprise selectively operates the SBR aerobic system according to the water quality requirement of process production water, and the SBR aerobic system is mainly used for removing ammonia nitrogen, total phosphorus and the like in wastewater.
In the embodiment of the invention, the SBR aerobic pool area is provided with a 1000 m aerobic pool area3The sedimentation tank (2) has an effective volume of 800 m when calculated by 80% of the effective volume3I.e. a dwell time of 2.45 d.
In the embodiment of the invention, the sedimentation tank can separate the aeration process and the sedimentation process in the SBR reaction process, improve the reaction efficiency of the aerobic tank, reduce the production operation difficulty and simultaneously complete the reflux of the aerobic sludge.
In a preferred embodiment, the settling tank in the step 5) adopts two sets of connected radial flow settling tanks, and the plane of a tank body in each tank adopts a round shape and/or a square shape. The wastewater enters the center of the radial flow settling tank, is discharged with mud, and is discharged from the periphery.
In the embodiment of the invention, the settling tank preferably adopts a radial flow settling tank, two communicated groups are arranged, and the plane of the tank body in the settling tank is more circular and also has a square shape. Wastewater enters the pool from a water inlet pipe at the center of the pool and slowly flows to the periphery of the pool along the radius direction. The suspended matters are settled in the flow and enter a sludge hopper along the gradient of the bottom of the tank, and the clarified water overflows from the periphery of the tank and flows out of a water channel. Namely, the center is used for water inlet and sludge discharge, the periphery is used for water outlet, the stirring force to the water body is small, and the sludge removal is facilitated.
In the embodiment of the invention, the width-flow settling tank is 200 m3If calculated as 80% of the effective volume, the effective volume is 160 m3And the retention time is 11.77 h.
In the embodiment of the invention, the air floatation is a solid-liquid separation technology which utilizes highly dispersed fine bubbles to adhere to non-soluble (hydrophobic) impurities existing in the wastewater and float out of the water surface, namely, for particles with relative density close to 1 or equal to 1, a large number of fine air bubbles can adhere to the surface of the particles, the density of the particles is reduced, the particle size of the particles is increased, and the particles quickly float to form scum, so that useful substances in the wastewater are recovered or the wastewater is purified.
In the embodiment of the invention, two enterprises are provided with 20m3The air flotation tank is mainly used for purification and chlorine dioxide disinfection after the treatment of the production wastewater.
In a preferred embodiment, the sand filtration system in step 7) uses quartz sand or activated carbon or anthracite or manganese sand.
In the embodiment of the invention, various types of treated production wastewater automatically flow to a water pool and are mixed with river side make-up water to be used as production process water.
In the embodiment of the invention, the sand filter is preferably selected as the sand filter in the sand filtering system, and the sand filter is high-efficiency filtering equipment which utilizes a filtering medium to remove various suspended matters, microorganisms and other fine particles in water and finally achieves the effects of reducing water turbidity and purifying water quality. The common filter materials comprise quartz sand, activated carbon, anthracite, manganese sand and the like.
In a preferred embodiment, the sterilization tank in step 7) is sterilized with calcium hypochlorite.
In the embodiment of the invention, in order to ensure that the water used in the production process meets the requirements of fermentation production, enterprises adopt a secondary disinfection treatment process, namely, after the air flotation tank is disinfected by chlorine dioxide and sand filtered, the air flotation tank enters a disinfection tank and is disinfected secondarily by calcium hypochlorite.
In the embodiment of the present invention, preferably, two project enterprises are provided, each of which is 30m3The sterilizing tank of (1), wherein the effective volume is 48m when calculated by 80% of the effective volume3The disinfection residence time is 3.52 h.
The treatment efficiency and effect analysis of the production wastewater are shown in the following table:
TABLE 1 Water treatment test results
Can know through table 1 testing result, through the processing in this application, can effectually clear up various solid impurity and chemical impurity in the waste water, the quality of final treated water can be used for satisfying the production requirement of fermentation process basically to there is not obvious influence to alcohol finished product quality.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The treatment method and the recovery process of the alcohol production wastewater are characterized by comprising the following steps:
1) collecting the production wastewater into a temporary storage tank, and uniformly injecting the collected production wastewater into an adjusting tank for pH adjustment, nutrient salt addition, sludge backflow and hydrolytic acidification;
2) the regulated wastewater in the regulating tank is uniformly introduced into the bottom of the reaction tank, flows upwards and flows through a sludge bed, and an anaerobic reaction occurs in the process;
3) the wastewater in the reaction tank is treated and then enters a settling tank for separation, the separated sludge is led into a regulating tank for reuse, and the wastewater is led into an aerobic tank for activated sludge sewage treatment in an intermittent aeration mode;
4) leading out sludge after the wastewater in the aerobic tank passes through the sedimentation tank, refluxing into the aerobic tank for recycling, and leading the treated wastewater into a sedimentation tank for further sedimentation and sludge discharge;
5) pouring the effluent of the settling tank into an air floatation tank, separating hydrophobic impurities with relative density close to that of water in the sewage, and simultaneously disinfecting by using chlorine dioxide;
6) the wastewater sterilized by the air flotation tank automatically flows into a pool, and is used for producing process water after being added with make-up water;
7) the water in the pool is further filtered and purified by the sand filtering system and then is further disinfected by the disinfection tank, and the production process water meeting the fermentation production requirement is obtained.
2. The method for treating and recovering alcohol production wastewater according to claim 1, wherein the hydrolysis acidification in the conditioning tank in step 1) hydrolyzes insoluble organic substances into soluble organic substances and decomposes macromolecular substances into small molecular substances by using hydrolysis and acid-producing bacteria.
3. The method for treating and recovering alcohol production wastewater according to claim 2, wherein the concentrated condensate passing through the cooling tower and the refined tower waste liquid are further injected in the step 1).
4. The method for treating and recovering alcohol production wastewater according to claim 1, wherein the reaction tank in step 2) is a UASB reaction tank.
5. The method for treating and recovering alcohol production wastewater according to claim 1, wherein the sedimentation tank in the step 4) is provided in an aerobic tank.
6. The method for treating and recovering alcohol production wastewater according to claim 5, wherein the aerobic tank is an SBR aerobic tank, and two sets of tanks are provided in communication with each other.
7. The alcohol production wastewater treatment method and recovery process according to claim 1, wherein the settling tank in step 5) is two sets of connected radial settling tanks, and the plane of the tank body in each tank is circular and/or square.
8. The method for treating and recovering alcohol production wastewater according to claim 7, wherein the wastewater is discharged from the center and the periphery of the radial settling tank.
9. The alcohol production wastewater treatment method and recovery process according to claim 1, wherein the sand filtration system in step 7) uses quartz sand or activated carbon or anthracite or manganese sand.
10. The method and the recycling process of alcohol production wastewater according to claim 1, wherein the disinfection tank in step 7) is disinfected with calcium hypochlorite.
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