CN103641275B - The treatment process of brewing industry sewage and equipment - Google Patents

Abstract

A treatment method and equipment for beer industrial sewage, the treatment method includes two steps of pretreatment and subsequent treatment: the pretreatment is to first perform Fenton reaction on the beer industrial sewage to degrade organic matter in the beer industrial sewage, and then perform ultrasonic Broken and decomposed into small molecular substances; the Fenton reaction conditions are: pH? 1.5-4.5, the dosage of H ₂ O ₂ is 50-200ml/m ³ , the dosage of Fe ²⁺ is 50-100g/m ³ , the reaction time is 0.5-2.0h, and the reaction temperature is 50-70℃. The power of the ultrasonic irradiation is 0.1-0.3kw, and the ultrasonic time is 10-50min; the subsequent treatment includes acid-base adjustment, aeration oxidation, clarification and biodegradation. The treatment of beer industry sewage in the present invention adopts Fenton reaction and ultrasonic irradiation plus comprehensive treatment of acid-base adjustment, aeration oxidation, clarification and biodegradation, so that the treated wastewater not only meets the discharge standard, but also can be used in the production process.

Description

Treatment method and equipment of beer industry sewage

technical field

The invention relates to the technical field of food industry treatment, in particular to a treatment method for brewery industrial sewage.

Background technique

With the rapid development of the industrial economy and the continuous improvement of people's living standards, beer has long been a frequent visitor on people's tables. With its cool, sweet and slightly bitter taste, beer attracts more and more people to love it. This has enabled the beer industry to develop rapidly and made my country the largest country in beer production. In 2012, the output of China's beer industry was 49.02 million kiloliters, a year-on-year increase of 3.1%. The rapid development of the beer industry has produced huge economic benefits, but also produced a large amount of sewage sludge. According to China International Beer Network, even though my country has stepped up efforts to treat beer wastewater, the total annual discharge of wastewater from the beer industry is still as much as 210 million tons. Therefore, how to deal with beer industry wastewater is always a research topic for environmental protection workers.

At present, the beer industry wastewater treatment reported in the public literature is mainly based on the combination of biochemistry and physicochemistry. The following three methods are common, 1. Direct aerobic method; 2. Hydrolysis acidification method plus subsequent treatment method; 3. UASB reactor treatment method . We also retrieved the following related literature:

1. Chinese patent, a treatment method for beer industry wastewater, application number: CN200810064382.9 application date: 2008.04.25 publication (announcement) number: CN101265002 publication (announcement) date: 2008.09.17 applicant (patent right) person: Harbin Industrial University; Abstract: A treatment method for beer industry wastewater, which relates to a treatment method for wastewater. The invention solves the defects of low COD removal rate and large excess sludge output in the existing beer industrial wastewater treatment method. The processing method of beer industry waste water of the present invention is carried out according to the following steps: 1. hydrolysis; 2. adjust pH value and temperature; 3. primary external circulation anaerobic reaction; 4. secondary external circulation anaerobic reaction; waste water. The COD removal rate of the beer wastewater treated by the method of the invention can reach 85%-95%, and the remaining sludge output of the beer wastewater treated by the method of the present invention is reduced by 40%-70%.

2. Chinese patent, storage device and method for anaerobic granular sludge in beer industry wastewater treatment, application date: 2008.04.28, application number: CN200810064394.1, publication (announcement) number: CN101264977, publication (announcement) date: 2008.09 .17 Applicant (patent right): Harbin Institute of Technology; Abstract: An anaerobic granular sludge storage device and method in beer industry wastewater treatment, which relates to a storage device and method for anaerobic granular sludge. It solves the problem that the current preservation technology of anaerobic granular sludge strains has complicated process, high cost and reduces the treatment specificity of the original granular sludge, and the mortality rate of the anaerobic granular activated sludge added to the target anaerobic equipment High, the problem of greatly reduced activity. The mud outlet of the mud inlet pipe of the device of the invention communicates with the mud inlet at the top of the tank, and the mud outlet at the bottom of the tank communicates with the mud inlet of the mud outlet pipe. The storage method is as follows: store the anaerobic granular sludge in the anaerobic granular sludge storage device in the beer wastewater treatment process, and pass it into the nutrient solution for storage. The device of the invention has the advantages of simple structure, small occupied area and flexible use mode. The method of the invention has the advantages of retaining the treatment specificity and original activity of the granular sludge, high survival rate, simple process and low cost, and can be mass-produced in a factory, and is convenient to use.

3. Chinese patent, a method for treating low-phosphorus beer wastewater Application number: CN201110328558.9 Application date: 2011.10.26, publication (announcement) number: CN102502948A, publication (announcement) date: 2012.06.20 Applicant (patent right) :Shenyang Jianzhu University;Abstract:Propose a solution for low-phosphorus beer comprehensive wastewater, that is, the wastewater treatment in which the mass ratio C/P of organic matter and total phosphorus content in water is 800-1500. By adjusting the operating parameters of the treatment system, the sludge concentration of the biochemical treatment system is controlled at 6000-10000mg/L, the hydraulic retention time is 8-15 hours, and the dissolved oxygen concentration (DO) in the water is 0.5-2.8mg/L. It can ensure that a small amount of phosphorus can be fully utilized in the biochemical activities of microorganisms, ensuring the stable operation of beer wastewater treatment facilities, and the effluent after treatment can meet the relevant standards stipulated by the state.

4. Chinese patent, method for treating beer wastewater by activated sludge method, application number: CN03139929.0 publication (announcement) number: CN1482077, publication (announcement) date: 2004.03.17 applicant (patent right) person: South China Environmental Science and Technology Development Company ;Abstract: A kind of activated sludge method is processed the method for beer waste water, comprises the following steps: (1) anaerobic reaction: beer waste water enters anaerobic baffle reactor from water tank, controls dissolved oxygen in anaerobic baffle reactor (DO) concentration is zero, anaerobic reaction for 24 hours; (2) facultative/aerobic reaction for 8 hours; realize the removal of higher concentration organic matter, ammonia nitrogen and total phosphorus in beer wastewater in one reaction device.

5. Chinese patent, pretreatment method for biochemical utilization of beer waste, application number: CN201110094439.1 publication (announcement) number: CN102212479A, publication (announcement) date: 2011.10.12 applicant (patent) person: Fujian Agriculture and Forestry University; abstract A kind of pretreatment method of biochemical utilization of beer waste, comprising the single or mixture of beer waste water, sludge, waste fresh beer yeast mud adopts ozone wall breaking, disinfection treatment, to increase the leaching of thalline content nutrients. The amount of ozone introduced is 0.3-0.8g ozone/g dry matter of beer waste, and the samples after ozone treatment can be used for fermentation and cultivation of microorganisms after being sterilized by high-pressure steam at 121°C for 45 minutes. After the above pretreatment, the release rate of nutrients is greatly improved, the amino nitrogen content of the medium is increased by 4-5 times, and the yield of amino nitrogen is 3-5%, which is very beneficial to the cultivation of microorganisms as a medium.

7. Chinese patent, a beer production wastewater treatment system, application number: CN201120022892.7, publication (announcement) number: CN201990574U publication (announcement) date: 2011.09.28 applicant (patent) person: Xiamen Green Power Environmental Treatment Engineering Co., Ltd. Company; Abstract: A beer production wastewater treatment system is characterized in that it includes: a low concentration wastewater pretreatment device and a high concentration wastewater pretreatment device, and the low concentration wastewater treatment device and the high concentration wastewater pretreatment device are connected through pipelines The SBR reaction tank is connected, and the SBR reaction tank is connected with the sludge concentration tank and the sludge dehydration room, and a supernatant liquid pipeline is connected with the SBR reaction tank on the sludge concentration tank. The utility model combines UASB and SBR two treatment units, and the formed treatment process highlights the advantages of each treatment unit, makes the treatment process simple, saves operating costs, and uses UASB as a pre-test for the discharge of the entire wastewater. The treatment unit, while reducing the concentration of wastewater, can recycle the produced biogas as energy.

Fenton reaction (Fenton) is a wastewater oxidation technology, mainly adding Fe ₂ SO ₄ and H ₂ O ₂ to the wastewater, through the reaction of Fe ²⁺ and H ₂ O ₂ , a strong oxidant hydroxyl radical is generated, and the macromolecule Refractory organic matter is decomposed into small molecular substances, and COD and SS in wastewater are removed. Fenton oxidation technology is an effective wastewater pretreatment technology

However, there is no report in the public literature on the oxidation treatment of beer wastewater by ultrasonic combined with Fenton reaction.

Contents of the invention

The purpose of the present invention is to propose a combined Fenton oxidation pretreatment technology using ultrasonic waves in order to remove COD and SS in beer industry wastewater, so that the treated reclaimed water can be reused, and the discharge of wastewater can be reduced.

Beer industry wastewater treatment method of the present invention comprises pretreatment and follow-up treatment two steps:

The said pretreatment is to first carry out the Fenton reaction on the beer industrial sewage, so that the organic matter of the beer industrial sewage is degraded, and then perform ultrasonic crushing to decompose into small molecular substances; the described Fenton reaction conditions are: pH1.5-4.5, The dosage of H ₂ O ₂ is 50-200ml/m ³ , the dosage of Fe ²⁺ is 50-100g/m ³ , the reaction time is 0.5-2.0h, and the reaction temperature is 50-70℃. The power of the irradiation is 0.1-0.3kw, and the ultrasonic time is 10-50min; the subsequent treatment includes acid-base adjustment, aeration oxidation, clarification and biodegradation.

In the Fenton reaction, the beer industrial sewage is added to an acid regulator to adjust the pH of the sewage to 1.5-4.5; the acid regulator is sulfuric acid or hydrochloric acid.

The subsequent treatment includes acid-base adjustment, aeration oxidation, clarification and biodegradation.

In the described follow-up treatment, the acid-base adjustment is to adjust the pH of the brewery industrial sewage to more than 5 with sodium hydroxide or lime;

In the subsequent treatment, the aeration oxidation is to put the sewage into the aeration tank and let in enough air; the oxidation time is 1-3 days.

The clarification is to add a flocculant after aeration and oxidation, and the amount of the flocculant added is 10-50ppm; the flocculant is polyacrylamide.

The biodegradation is to pass the basically clarified sewage into the pool with aquatic plants and stay for more than 2 days.

If the sewage has foam, add a defoamer, and the defoamer is sucrose ester.

The water obtained after biodegradation can be used as cooling water for beer production or for the first cleaning of beer bottles entering the factory.

The equipment used in the beer industry wastewater treatment method of the present invention comprises a Fenton reactor, an ultrasonic tank, an ultrasonic transducer, an ultrasonic generator, an aeration oxidation tank, an aeration device, an air compressor, a clarifier tank and a biodegradation tank; The Fenton reactor described above is installed in front of the ultrasonic pool, and is provided with a beer sewage sludge inlet pipe and a liquid outlet pipe after reaction. An ultrasonic transducer is installed in the ultrasonic pool, and the sound energy of the ultrasonic transducer is generated by the ultrasonic generator. Provide; the outlet of the ultrasonic tank is connected to the aeration oxidation tank, and an aeration device is installed in the aeration oxidation tank, and the gas is provided by an air compressor; the aeration oxidation tank is connected to a clarification tank and a biodegradation tank, and a flocculant or defoamer is added to the clarification tank. Biodegradation ponds are ponds for planting aquatic plants.

Principle of the present invention:

Fenton’s reagent has some reports in the past in sewage treatment, that is, adding Fe ₂ SO ₄ and H ₂ O ₂ , the mixed solution of hydrogen peroxide (H ₂ O ₂ ) and ferrous ion Fe ²⁺ has strong oxidizing properties and can It oxidized many known organic compounds such as carboxylic acids, alcohols, and esters into inorganic states at that time, and the oxidation effect was very obvious. The combination of ferrous salt and hydrogen peroxide is called Fenton’s reagent, which can effectively oxidize and remove the pollutants that cannot be obtained by traditional wastewater treatment technologies. The essence of the refractory organic matter to be removed is that H ₂ O ₂ generates highly reactive hydroxyl radicals (·OH) under the catalysis of Fe ²⁺ , and ·OH can interact with most organic matters to degrade them.

Ultrasound is an elastic wave with a frequency higher than 20 kHz and does not cause hearing. The cavitation effect, thermal effect and mechanical action of ultrasonic waves are the three theoretical basis for ultrasonic technology to accelerate the brewing process of medicinal wine. (1) Cavitation. There are often some vacuum or small bubbles containing a small amount of gas or vapor in the liquid, and these small bubbles are of different sizes. When a certain frequency of ultrasonic waves acts on the liquid, only small bubbles with a suitable size can resonate, small bubbles larger than the resonance size are driven out of the liquid, and small bubbles smaller than the resonance size gradually become larger under the action of ultrasound. When approaching the resonant size, the sparse stage of the sound wave makes the small bubble expand rapidly, and in the compression stage of the sound wave, the small bubble is suddenly compressed adiabatically until it is annihilated. During the annihilation process, the inside of the vesicle can reach a high temperature of several thousand degrees and a high pressure of several thousand atmospheres. The above phenomenon is called cavitation phenomenon. When the vesicles expand, charges can be generated due to friction, and discharge and light emission can occur during the annihilation process. Ultrasonic waves can cause chemical reactions that cannot occur under normal temperature and pressure to occur under the action of cavitation, which can rupture the sludge cells and accelerate decomposition. (2) thermal effect. Ultrasound propagates in the medium, and its vibration energy is continuously absorbed by the medium and transformed into heat energy to increase its temperature. The absorption of sound energy can cause overall heating in the medium, local heating outside the boundary, and local heating at the wavefront when cavitation forms a shock wave, etc. The greater the intensity of the ultrasonic waves, the stronger the heat generated. This local heating effect can accelerate the dissolution of active ingredients in medicinal materials. (3) Mechanical action. Ultrasound is the transmission of mechanical vibration energy, which can form effective agitation and flow in the liquid, destroy the structure of the medium, crush the particles in the liquid, and achieve the effect that ordinary low-frequency mechanical agitation cannot achieve. This mechanical agitation can make the liquid concentration diffuse and accelerate the leaching of active ingredients. In addition, it is also found that ultrasound can activate certain enzymes and physiological and chemical processes involved in cells, and increase enzymes to accelerate cell metabolism. In the ultrasonic process, the mechanical vibration mechanism is generated and broken by the tiny bubbles generated by the fluctuating pressure. This vibration has the effect of destroying the structure and composition of cells. For the heterogeneous interface, due to the tangential force of ultrasonic vibration and micro-jet flow, the solid phase particles or plates will be broken and thinned, which can remove dirt. Ultrasonic has a strong sterilization and fresh-keeping effect.

The principles of aerated oxidation tanks, clarification tanks and biodegradation tanks have been documented in many open literatures, so they will not be mainly introduced here.

Beneficial effects of the present invention:

The beer industry wastewater treatment method of the present invention adopts the Fenton reaction and ultrasonic crushing plus the comprehensive treatment of acid-base adjustment, aeration, oxidation, clarification and decolorization and biodegradation, so that the treated wastewater not only meets the discharge standard, but also can be used in the production process .

The present invention can not only treat beer industrial wastewater, but also food industrial wastewater, textile industrial wastewater, urban sewage, metallurgical industrial wastewater, and the like.

Description of drawings

Fig. 1 is the schematic diagram of the beer industry sewage treatment equipment of the present invention.

Serial number and part name in the figure:

1. Fenton reactor, 2. Ultrasonic tank, 3. Ultrasonic transducer, 4. Ultrasonic generator, 5. Aeration oxidation tank, 6. Aeration device, 7. Air compressor, 8. Clarification tank, 9 , Biodegradation pool.

As shown in Figure 1, described Fenton reactor 1 is installed in the front of ultrasonic pool 2, is provided with beer sewage sludge inlet pipe and the liquid outlet pipe after reaction, ultrasonic transducer 3 is installed in the ultrasonic pool 2, The acoustic energy of the ultrasonic transducer 3 is provided by an ultrasonic generator 4 . The outlet of the ultrasonic pool 2 is connected to the regulating aeration pool 5, and the aeration device 6 is installed in the regulating aeration pool 5, and the gas is provided by the air compressor 7; The decolorizing pool 8 adds a decolorizing agent and a flocculant, and the biodegradation pool 9 is a pool for planting aquatic plants.

detailed description

Example 1

Pass beer sewage into Fenton reactor 1, the dosage of H ₂ O ₂ is 70ml/m ³ , the dosage of Fe ²⁺ is 50g/m ³ , and sulfuric acid is added to adjust the pH to 1.5-2.0, and the reaction time is 0.5h, the reaction temperature is 50°C, and then enter the ultrasonic pool 2, set the power of ultrasonic irradiation to 0.1kw, ultrasonic time = 10min; Gas device 6, gas is provided by air compressor 7; Aeration oxidation tank 6 is followed by clarification tank 8 and biodegradation tank 9, and clarification tank 8 adds flocculant, and described flocculant is that polyacrylamide flocculant addition is 10ppm , and finally enter the biodegradation pool 9, which is a pond for planting aquatic plants duckweed or reed, and the residence time is more than 2 days.

Example 2

Pass urban sewage into Fenton reactor 1, the dosage of H ₂ O ₂ is 50ml/m ³ , the dosage of Fe ²⁺ is 80g/m ³ , and sulfuric acid is added to adjust the pH to 2.0-3.0, and the reaction time is 1.5h, the reaction temperature is 60°C, then enter the ultrasonic pool 2, set the power of ultrasonic irradiation to 0.2kw, and the ultrasonic time is 30min; Device 6, the gas is provided by the air compressor 7; the aeration oxidation tank 6 is connected to the clarification tank 8 and the biodegradation tank 9, and the clarification tank 8 is added with a flocculant, and the described flocculant is a polyacrylamide flocculant in an amount of 30ppm, Finally enter the biodegradation pool 9, which is a pool for planting aquatic plants duckweed or reed, and the residence time is more than 4 days. If the sewage has foam, a defoamer can also be added. The defoamer is sucrose ester, and the addition amount of sucrose ester is 50ppm.

Example 3

Pass the sewage from the printing and dyeing factory into the Fenton reactor 1, the dosage of H ₂ O ₂ is 180ml/m ³ , the dosage of Fe ²⁺ is 90g/m ³ , and sulfuric acid is added to adjust the pH to 2.0-3.0, the reaction time 1.5h, the reaction temperature is 60°C, and then enters the ultrasonic pool 2, the power of ultrasonic irradiation is set to 0.5kw, and the ultrasonic time is 60min; Gas device 6, gas is provided by air compressor 7; Aeration oxidation tank 6 is followed by clarification tank 8 and biodegradation tank 9, clarification tank 8 adds decolorizing agent polyferric sulfate and flocculant, and described flocculant is polyacrylamide The amount of flocculant added is 50ppm, and finally enters the biodegradation pool 9, which is a pool for planting aquatic plants duckweed or reed, and the residence time is more than 5 days. If the sewage has foam, a defoamer can also be added. The defoamer is sucrose ester, and the addition amount of sucrose ester is 100ppm.

Example 4

Pass the sewage from the starch factory into the Fenton reactor 1, the dosage of H ₂ O ₂ is 120ml/m ³ , the dosage of Fe ²⁺ is 100g/m ³ , and sulfuric acid is added to adjust the pH to 2.0-4.0, the reaction time 2.0h, the reaction temperature is 60°C, and then enter the ultrasonic pool 2, set the power of ultrasonic irradiation to 0.3kw, ultrasonic time 30min; Gas device 6, gas is provided by air compressor 7; Aeration oxidation tank 6 is followed by clarification tank 8 and biodegradation tank 9, and clarification tank 8 adds decolorant and flocculant, and described flocculant is added by polyacrylamide flocculant The amount is 30ppm, and finally enters the biodegradation pond 9, which is a pond for planting aquatic plants duckweed or reed, and the residence time is more than 4 days. If the sewage has foam, a defoamer can also be added. The defoamer is sucrose ester, and the addition amount of sucrose ester is 50ppm.

Laboratory test:

1. The Fenton reaction conditions are: pH 1.5-4.5, H ₂ O ₂ dosage 50-80ml/m ³ , Fe ²⁺ dosage 50-100g/m ₃ , reaction time 0.5 -2.0h, the reaction temperature is 50-70°C, the power of the ultrasonic irradiation is 0.1-0.3kw, and the ultrasonic time is 10-50min. The obtained data shows that these conditions can treat beer sludge sewage.

Claims (2)

1. the treatment process of a brewing industry sewage, it is characterized in that: treatment process comprises pre-treatment and subsequent disposal two steps: described pre-treatment: be first carry out Fenton's reaction to brewing industry sewage, make brewing industry sewage degradation of organic substances, then carry out ultrasound wave irradiation, be decomposed into small-molecule substance; Described Fenton's reaction condition is: pH1.5-4.5, H ₂0 ₂dosage 50-200ml/m ³, Fe ²⁺dosage 50-100g/m ³, the reaction times is 0.5-2.0h, and temperature of reaction is 50-70 DEG C, and described subsequent disposal is acid-alkali accommodation, aerating oxidation, clarification and biological degradation, and the power of described ultrasound wave irradiation is 0.1-0.3kw, and ultrasonic time is 10-50min; Described Fenton's reaction is that brewing industry sewage is added acid regulator, and the pH regulating sewage is 1.5-4.5; Acid regulator is sulfuric acid or hydrochloric acid; Described subsequent disposal comprises acid-alkali accommodation, aerating oxidation, clarification and biological degradation;

In described subsequent disposal, acid-alkali accommodation regulates pH to more than 5 in brewing industry sewage sodium hydroxide or lime;

In described subsequent disposal, described aerating oxidation is put in aeration tank by sewage to pass into enough air; Oxidization time is l-3 days;

Described clarification adds flocculation agent after aerating oxidation, and flocculant addition is 10-50ppm; Described flocculation agent is polyacrylamide;

Described biological degradation be basic settled sewage is led to waterplant pond in more than the 2 days residence time;

Described treatment process also comprises and adds defoamer, and described defoamer is sucrose ester;

The device that the treatment process of above-mentioned brewing industry sewage adopts is made up of Fenton reactor, ultrasonic wave pond, ultrasonic transducer, ultrasonic generator, aeration oxidation pool, aerating apparatus, air compressor machine, settling pond and biological degradation pond; Described Fenton reactor is arranged on before ultrasonic wave pond, be provided with beer sewage sludge inlet pipe and reacted liquid outlet tube, ultrasonic wave is provided with ultrasonic transducer inside pond, and the acoustic energy of ultrasonic transducer is provided by the ultrasonic generator be arranged on outside ultrasonic wave pond; The outlet of ultrasonic wave pond connects aeration oxidation pool, and install aerating apparatus in aeration oxidation pool, gas is provided by air compressor machine; Connect settling pond and biological degradation pond after aeration oxidation pool, settling pond adds flocculation agent or defoamer, and biological degradation pond is the pond of planting aquatic plants.

2. the application for the treatment of process in process foodstuffs industry sewage, textile industry sewage, municipal effluent and metallurgical industry sewage of the industrial sewage described in claim l.