CN109879386B - Food industry wastewater treatment process - Google Patents
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Abstract
The invention discloses a food industry wastewater treatment process, which comprises the following operation steps: A. firstly, allowing the food industry wastewater to flow through a multi-grid, then discharging into a sedimentation tank, and adding a flocculating agent for flocculation; B. discharging into acid-base adjusting tank, sterilizing with ultraviolet rays, and adjusting pH to 5.5-7.5; C. introducing the mixture into an anaerobic aeration tank, then introducing the mixture into an aerobic tank, treating the mixture by using a facultative membrane bioreactor, adding a reducing agent, filtering the mixture by adopting an activated carbon filtering process, and then performing sedimentation treatment; D. filtering by adopting a security filtration process, a microfiltration membrane filtration process, an ultrafiltration membrane filtration process and a reverse osmosis membrane filtration process; the flocculant comprises ferrous chloride, oleic acid, xylan and rubber stock solution. The invention adopts xylan, rubber stock solution and oleic acid as a reinforcing system, thereby improving the flocculation capacity and the removal rate of organic dissolved matters of the food industry wastewater treatment process.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a food industry wastewater treatment process.
Background
The slaughterhouse wastewater contains a large amount of blood pollutants, hair, broken bone and meat, foot shells, waste viscera and other pollutants, the concentration of suspended matters is high, the water is reddish brown and has obvious fishy smell, and the slaughterhouse wastewater is typical high-suspended-matter organic wastewater easy to biodegrade. The discharged wastewater contains a large amount of pollutants such as organic matters, solid suspended matters, ammonia nitrogen and the like, and if the pollutants are not treated, the pollutants are directly discharged into a natural water body, so that a large amount of dissolved oxygen in the water body can be consumed, the water body is blacked and smelled, water body eutrophication is generated, and meanwhile, a large amount of suspended matters can block pipelines and the like, so that the ecological environment of the water body is seriously damaged. Therefore, the patent with the application number of CN201710887713.8 discloses a slaughter house sewage treatment method, which relates to the technical field of sewage treatment, and comprises the steps of dry-wet separation, flocculation sedimentation, decoloration, ammonia nitrogen removal and the like, the treatment speed of the food industry wastewater is greatly improved by mixing catalytic water and matching with the processes of flocculation, ammonia nitrogen removal, color removal and the like, the treatment cost of the sewage is reduced, the realization is convenient, and the problem of sewage treatment and discharge in small slaughter houses is solved. However, the above solution has the following disadvantages in use: the nitrogen element in the sewage is only treated by the sodium carbonate, the nitrogen element is not completely removed, in addition, the fishy smell in the sewage cannot be treated, the sewage treatment is not complete, and the water quality is influenced. The industrial wastewater refers to wastewater, sewage and waste liquid generated in the industrial production process, and contains industrial production materials, intermediate products and products which are lost along with water, and pollutants generated in the production process. With the rapid development of industry, the variety and quantity of waste water are rapidly increased, the pollution to water bodies is more and more extensive and serious, and the health and the safety of human beings are threatened.
Industrial waste water is generally classified into three categories:
the first is classified according to the chemical properties of main pollutants contained in industrial wastewater, and inorganic wastewater mainly contains inorganic pollutants and organic wastewater mainly contains organic pollutants. For example electroplating wastewater and wastewater from mineral processing, are inorganic wastewater; the waste water from food or petroleum processing is organic waste water. The second is classified according to the products and processing objects of industrial enterprises, such as metallurgical wastewater, paper-making wastewater, coke-oven gas wastewater, metal pickling wastewater, chemical fertilizer wastewater, textile printing and dyeing wastewater, dye wastewater, tanning wastewater, pesticide wastewater, power station wastewater and the like. The third is classified according to the main components of the pollutants contained in the wastewater, such as acidic wastewater, alkaline wastewater, cyanide-containing wastewater, chromium-containing wastewater, cadmium-containing wastewater, mercury-containing wastewater, phenol-containing wastewater, aldehyde-containing wastewater, oil-containing wastewater, sulfur-containing wastewater, organic phosphorus-containing wastewater, radioactive wastewater, and the like.
The first two classifications do not relate to the main constituents of the pollutants contained in the wastewater, nor do they indicate the harmfulness of the wastewater. The third classification, which explicitly indicates the composition of the main pollutants in the wastewater, can indicate a certain hazard of the wastewater. In addition, the main pollutants in the wastewater are classified into three types from the difficulty of wastewater treatment and the harmfulness of the wastewater: the first type is waste heat which is mainly from cooling water which can be recycled; the second category is conventional pollutants, i.e. substances which have no obvious toxicity and are easy to biodegrade, including biodegradable organic matters, compounds which can be used as biological nutrients, suspended solids and the like; the third category is toxic pollutants, i.e. substances that are toxic and not easily biodegradable, including heavy metals, toxic compounds, and organic compounds that are not easily biodegradable. The existing method and system for treating the industrial wastewater of the food industry can not economically and effectively treat a large amount of sewage discharged by the chemical industry.
Chinese patent application No. 201610749362.X discloses a food industry wastewater treatment process, comprising the steps of: A. the wastewater flows through multiple grids, is flocculated and blown into air, and is subjected to precipitation treatment; B. sterilizing with ultraviolet rays, and adjusting pH to 5.5-7.5 with alkali; C. introducing into an anaerobic aeration tank and an aerobic tank in sequence, treating by a facultative membrane bioreactor, filtering by adopting activated carbon, and performing precipitation treatment; D. firstly, filtering by adopting a security filtration process, then filtering by adopting a microfiltration membrane filtration process, then filtering by adopting an ultrafiltration membrane filtration process, and finally filtering by adopting a reverse osmosis membrane filtration process to obtain the discharge water meeting the environmental protection standard; compared with the prior art, the method can simply, conveniently and quickly neutralize the food industry wastewater, and can remove suspended matters, metal oxides, colloids, organic matters, nitrogen source substances, bacteria and the like in the wastewater, but the process provided by the invention also has a space for improving the removal effect, particularly the removal rate of organic matter dissolved matters and the removal rate of turbidity.
Disclosure of Invention
The invention aims to provide a food industry wastewater treatment process, which optimizes components, dosage, methods and the like on the basis of the disclosure of a patent application document 'food industry wastewater treatment method (publication number: CN 106348523A)' and further improves the flocculation capacity and the organic matter dissolved matter removal rate of the food industry wastewater treatment process.
In order to solve the technical problems, the invention adopts the following technical scheme:
a food industry wastewater treatment process specifically comprises the following operation steps: A. primary filtering and sedimentation: firstly, allowing the food industrial wastewater to flow through a multiple grid, then discharging the food industrial wastewater into a sedimentation tank, adding a flocculating agent for flocculation, blowing air in, and then performing sedimentation treatment to obtain a supernatant of the industrial wastewater; B. ultraviolet sterilization and pH value adjustment: discharging the supernatant of the industrial wastewater in the step A into an acid-base adjusting tank, sterilizing and disinfecting by using ultraviolet rays, removing peculiar smell, and adjusting the pH value to 5.5-7.5 to obtain the industrial wastewater with the acid-base value adjusted; C. bacterial decomposition and activated carbon filtration: introducing the industrial wastewater with the pH value adjusted in the step B into an anaerobic aeration tank, decomposing macromolecular carbon source substances and macromolecular nitrogen source substances by using anaerobic bacteria, introducing the industrial wastewater into an aerobic tank, decomposing micromolecular carbon source substances and micromolecular nitrogen source substances in the wastewater by using aerobic bacteria, treating the wastewater flowing out of the aerobic tank by using a facultative membrane bioreactor, adding a reducing agent, filtering by using an activated carbon filtering process, and settling to obtain the filtered industrial wastewater; D. membrane filtration: filtering the filtered industrial wastewater in the step C by adopting a security filtration process, then filtering by adopting a microfiltration membrane filtration process, then filtering by adopting an ultrafiltration membrane filtration process, and finally filtering by adopting a reverse osmosis membrane filtration process to obtain the discharged water meeting the environmental protection standard; the flocculant comprises ferrous chloride, oleic acid, xylan and rubber stock solution, wherein the proportion of the oleic acid to the xylan to the rubber stock solution is (8-10): (4-8): (2-4).
Further, the proportion of the oleic acid, the xylan and the rubber stock solution is 9: 6: 3.
further, the flocculant comprises the following raw materials in parts by weight: 40-60 parts of ferrous chloride, 8-10 parts of oleic acid, 4-8 parts of xylan and 2-4 parts of rubber stock solution.
Further, the flocculant comprises the following raw materials in parts by weight: 50 parts of ferrous chloride, 9 parts of oleic acid, 6 parts of xylan and 3 parts of rubber stock solution.
Further, the addition amount of the flocculant is 40-60 ppm.
Further, in the step A, air is blown into the sedimentation tank for 10-20min, and the treatment is carried out for 10-40 min.
Further, in the step C, the concentration of the activated sludge in the reaction zone of the facultative membrane bioreactor is controlled to be 2000-6000mg/L, so that the hydraulic retention time of the facultative membrane bioreactor is 6-9 hours.
Further, in the step C, the activated carbon in the activated carbon filtration process is granular activated carbon.
Further, in the step D, the cartridge filter is adopted in the cartridge filtration process, the microfiltration membrane filter is adopted in the microfiltration membrane filtration process, the ultrafiltration membrane filter is adopted in the ultrafiltration membrane filtration process, and the reverse osmosis membrane filter is adopted in the reverse osmosis membrane filtration process.
The invention has the following beneficial effects:
(1) as can be seen from the data of examples 1 to 3 and comparative example 5, the flocculation capacity and organic matter solute removal rate of the food industry wastewater treatment process prepared in examples 1 to 3 were significantly higher than those of the food industry wastewater treatment process prepared in comparative example 5; meanwhile, as can be seen from the data of examples 1 to 3, example 1 is the most preferred example.
(2) As can be seen from the data of example 1 and comparative examples 1-4, the oleic acid, xylan and rubber stock solution play a synergistic role in the treatment process for preparing the food industry wastewater, and the flocculation capacity and the removal rate of organic dissolved matters of the food industry wastewater treatment process are synergistically improved; this is:
the invention is favorable for denitrification treatment in the subsequent process by adjusting the pH value of the sewage in advance, the anaerobic aeration tank decomposes macromolecular carbon source substances and macromolecular nitrogen source substances therein by using anaerobic bacteria, then the anaerobic aeration tank is introduced into the aerobic tank, decomposes micromolecular carbon source substances and micromolecular nitrogen source substances in the wastewater by using the aerobic bacteria, and then the facultative membrane bioreactor is used for treating the wastewater flowing out of the aerobic tank, thereby improving the sewage treatment effect. But the flocculation capacity and the removal rate of organic dissolved matters are not satisfactory when ferrous chloride is used as a flocculating agent alone, so that the applicant finds that oleic acid, xylan and rubber stock solution play a synergistic role in the treatment process of preparing the food industry wastewater through repeated experiments.
The probable mechanism is presumed to be that xylan is a main component of plant hemicellulose, has good adsorbability on suspended particles to form agglomerates so as to enhance the flocculation effect, is a highly branched heterogeneous polysaccharide, and has a hydrogen bond chelating effect and a good adsorption effect on dissolved organic matters in sewage due to a highly branched structure; the macromolecular chains of the rubber stock solution are in a random-winding curve cluster shape, the internal space structure of the rubber stock solution can have a good adsorption and agglomeration effect on soluble organic matters in water due to nitrogen organic matters, meanwhile, suspended particles of the rubber stock solution have an agglomeration core effect and can enhance a flocculation effect, the branched chains of the macromolecular chains also have a gel state performance and can lock and dissolve the organic matters and enable long-chain molecules of xylan to penetrate through the branched chains, so that the hydrophilicity of the xylan can be increased, the suspension capacity can be improved, the sedimentation of the xylan can be prevented, the retention suspension time can be prolonged, and the flocculation effect can be enhanced; oleic acid is a weakly acidic surfactant, can partially complex ferrous ions, improves the stability of the ferrous ions, can be combined with hydroxyl groups of xylan through hydrogen bonding, enhances the dispersibility and the retention time of the xylan in a water body, can soften the macromolecular structure of rubber in a rubber stock solution, enhances the space volume of the rubber stock solution, improves the adsorption effect, stabilizes a gel region formed by branched chains of rubber particles, and enhances the stability of the dissolved organic matters adsorbed by the rubber particles, thereby producing better flocculation effect and removal rate of the dissolved organic matters.
(3) As can be seen from the data of comparative examples 6-8, the weight ratios of oleic acid, xylan, and rubber stock solution are not (8-10): (4-8): (2-4), the flocculation capacity and the organic matter solute removal rate of the flocculant obtained were significantly different from those of examples 1-3, and were much smaller than those of examples 1-3, which were equivalent to those of the prior art (comparative example 5). The oleic acid, xylan and rubber stock solution are used as a reinforcing system, and the oleic acid, xylan and rubber stock solution are added in the treatment process of controlling and preparing the food industry wastewater in the examples 1 to 3 according to the weight ratio of (8-10): (4-8): (2-4), hydrogen bond chelation and good adsorption effect of dissolved organic matters in the sewage are realized by utilizing the high-degree branch structure of the xylan in the reinforcing system; the internal space structure of the macromolecular chain of the rubber stock solution can have good adsorption and agglomeration effects on soluble organic matters dissolved in water, and long-chain molecules of xylan can be inserted into the macromolecular chain, so that the hydrophilicity of the xylan is increased, the suspension capacity is improved, the retention suspension time is prolonged, and the flocculation effect is enhanced; oleic acid passes through the hydroxyl combination of hydrogen bond effect with xylan to reinforcing xylan's dispersibility and dwell time in the water, it can soften the macromolecular structure of rubber in the rubber stoste simultaneously, thereby strengthen its space volume and improve adsorption effect, and can stabilize the gel region that rubber particle's branch formed, the reinforcing dissolves the stability that the organic matter was adsorbed by rubber particle, thereby realized oleic acid, xylan, rubber stoste has played the technological effect of reinforcing flocculation ability in coordination and dissolving organic matter adsorption capacity in sewage treatment.
Detailed Description
In order to facilitate a better understanding of the invention, the following examples are given to illustrate, but not to limit the scope of the invention.
In the embodiment, the food industry wastewater treatment process specifically comprises the following operation steps: A. primary filtering and sedimentation: firstly, allowing the food industrial wastewater to flow through a multiple grid, then discharging the food industrial wastewater into a sedimentation tank, adding a flocculating agent for flocculation, blowing air in, and then performing sedimentation treatment to obtain a supernatant of the industrial wastewater; B. ultraviolet sterilization and pH value adjustment: discharging the supernatant of the industrial wastewater in the step A into an acid-base adjusting tank, sterilizing and disinfecting by using ultraviolet rays, removing peculiar smell, and adjusting the pH value to 5.5-7.5 to obtain the industrial wastewater with the acid-base value adjusted; C. bacterial decomposition and activated carbon filtration: introducing the industrial wastewater with the pH value adjusted in the step B into an anaerobic aeration tank, decomposing macromolecular carbon source substances and macromolecular nitrogen source substances by using anaerobic bacteria, introducing the industrial wastewater into an aerobic tank, decomposing micromolecular carbon source substances and micromolecular nitrogen source substances in the wastewater by using aerobic bacteria, treating the wastewater flowing out of the aerobic tank by using a facultative membrane bioreactor, adding a reducing agent, filtering by using an activated carbon filtering process, and settling to obtain the filtered industrial wastewater; D. membrane filtration: and C, filtering the filtered industrial wastewater in the step C by adopting a security filtration process, then filtering by adopting a microfiltration membrane filtration process, then filtering by adopting an ultrafiltration membrane filtration process, and finally filtering by adopting a reverse osmosis membrane filtration process to obtain the discharged water meeting the environmental protection standard.
The flocculant comprises the following raw materials in parts by weight: 40-60 parts of ferrous chloride, 8-10 parts of oleic acid, 4-8 parts of xylan and 2-4 parts of rubber stock solution. The addition amount of the flocculant is 40-60 ppm.
In the step A, air is blown into the sedimentation tank for 10-20min, and the treatment is carried out for 10-40 min. In the step C, the concentration of the activated sludge in the reaction area of the facultative membrane bioreactor is controlled to be 2000-6000mg/L, so that the hydraulic retention time of the facultative membrane bioreactor is 6-9 hours. In the step C, the activated carbon in the activated carbon filtering process is granular activated carbon. In the step D, a cartridge filter is adopted in the cartridge filtering process, a microfiltration membrane filter is adopted in the microfiltration membrane filtering process, an ultrafiltration membrane filter is adopted in the ultrafiltration membrane filtering process, and a reverse osmosis membrane filter is adopted in the reverse osmosis membrane filtering process.
Example 1
A food industry wastewater treatment process specifically comprises the following operation steps: A. primary filtering and sedimentation: firstly, allowing the food industrial wastewater to flow through a multiple grid, then discharging the food industrial wastewater into a sedimentation tank, adding a flocculating agent for flocculation, blowing air in, and then performing sedimentation treatment to obtain a supernatant of the industrial wastewater; B. ultraviolet sterilization and pH value adjustment: discharging the supernatant of the industrial wastewater in the step A into an acid-base adjusting tank, sterilizing and disinfecting by using ultraviolet rays, removing peculiar smell, and adjusting the pH value to 6.5 to obtain the industrial wastewater with the acid-base value adjusted; C. bacterial decomposition and activated carbon filtration: introducing the industrial wastewater with the pH value adjusted in the step B into an anaerobic aeration tank, decomposing macromolecular carbon source substances and macromolecular nitrogen source substances by using anaerobic bacteria, introducing the industrial wastewater into an aerobic tank, decomposing micromolecular carbon source substances and micromolecular nitrogen source substances in the wastewater by using aerobic bacteria, treating the wastewater flowing out of the aerobic tank by using a facultative membrane bioreactor, adding a reducing agent, filtering by using an activated carbon filtering process, and settling to obtain the filtered industrial wastewater; D. membrane filtration: and C, filtering the filtered industrial wastewater in the step C by adopting a security filtration process, then filtering by adopting a microfiltration membrane filtration process, then filtering by adopting an ultrafiltration membrane filtration process, and finally filtering by adopting a reverse osmosis membrane filtration process to obtain the discharged water meeting the environmental protection standard.
The flocculant comprises the following raw materials in parts by weight: 50 parts of ferrous chloride, 9 parts of oleic acid, 6 parts of xylan and 3 parts of rubber stock solution. The addition amount of the flocculant is 60 ppm.
In the step A, 15min of air is blown into the sedimentation tank for treatment for 25 min. In the step C, the concentration of the activated sludge in the reaction zone of the facultative membrane bioreactor is controlled to be 4000mg/L, so that the hydraulic retention time of the facultative membrane bioreactor is 7.5 hours. In the step C, the activated carbon in the activated carbon filtering process is granular activated carbon. In the step D, a cartridge filter is adopted in the cartridge filtering process, a microfiltration membrane filter is adopted in the microfiltration membrane filtering process, an ultrafiltration membrane filter is adopted in the ultrafiltration membrane filtering process, and a reverse osmosis membrane filter is adopted in the reverse osmosis membrane filtering process.
Example 2
A food industry wastewater treatment process specifically comprises the following operation steps: A. primary filtering and sedimentation: firstly, allowing the food industrial wastewater to flow through a multiple grid, then discharging the food industrial wastewater into a sedimentation tank, adding a flocculating agent for flocculation, blowing air in, and then performing sedimentation treatment to obtain a supernatant of the industrial wastewater; B. ultraviolet sterilization and pH value adjustment: discharging the supernatant of the industrial wastewater in the step A into an acid-base adjusting tank, sterilizing and disinfecting by using ultraviolet rays, removing peculiar smell, and adjusting the pH value to 5.5 to obtain the industrial wastewater with the acid-base value adjusted; C. bacterial decomposition and activated carbon filtration: introducing the industrial wastewater with the pH value adjusted in the step B into an anaerobic aeration tank, decomposing macromolecular carbon source substances and macromolecular nitrogen source substances by using anaerobic bacteria, introducing the industrial wastewater into an aerobic tank, decomposing micromolecular carbon source substances and micromolecular nitrogen source substances in the wastewater by using aerobic bacteria, treating the wastewater flowing out of the aerobic tank by using a facultative membrane bioreactor, adding a reducing agent, filtering by using an activated carbon filtering process, and settling to obtain the filtered industrial wastewater; D. membrane filtration: and C, filtering the filtered industrial wastewater in the step C by adopting a security filtration process, then filtering by adopting a microfiltration membrane filtration process, then filtering by adopting an ultrafiltration membrane filtration process, and finally filtering by adopting a reverse osmosis membrane filtration process to obtain the discharged water meeting the environmental protection standard.
The flocculant comprises the following raw materials in parts by weight: 60 parts of ferrous chloride, 8 parts of oleic acid, 8 parts of xylan and 2 parts of rubber stock solution. The addition amount of the flocculant is 60 ppm.
In the step A, air is blown into the sedimentation tank for 10min, and the treatment is carried out for 40 min. In the step C, the concentration of the activated sludge in the reaction zone of the facultative membrane bioreactor is controlled to be 2000mg/L, so that the hydraulic retention time of the facultative membrane bioreactor is 9 hours. In the step C, the activated carbon in the activated carbon filtering process is granular activated carbon. In the step D, a cartridge filter is adopted in the cartridge filtering process, a microfiltration membrane filter is adopted in the microfiltration membrane filtering process, an ultrafiltration membrane filter is adopted in the ultrafiltration membrane filtering process, and a reverse osmosis membrane filter is adopted in the reverse osmosis membrane filtering process.
Example 3
A food industry wastewater treatment process specifically comprises the following operation steps: A. primary filtering and sedimentation: firstly, allowing the food industrial wastewater to flow through a multiple grid, then discharging the food industrial wastewater into a sedimentation tank, adding a flocculating agent for flocculation, blowing air in, and then performing sedimentation treatment to obtain a supernatant of the industrial wastewater; B. ultraviolet sterilization and pH value adjustment: discharging the supernatant of the industrial wastewater in the step A into an acid-base adjusting tank, sterilizing and disinfecting by using ultraviolet rays, removing peculiar smell, and adjusting the pH value to 7.5 to obtain the industrial wastewater with the acid-base value adjusted; C. bacterial decomposition and activated carbon filtration: introducing the industrial wastewater with the pH value adjusted in the step B into an anaerobic aeration tank, decomposing macromolecular carbon source substances and macromolecular nitrogen source substances by using anaerobic bacteria, introducing the industrial wastewater into an aerobic tank, decomposing micromolecular carbon source substances and micromolecular nitrogen source substances in the wastewater by using aerobic bacteria, treating the wastewater flowing out of the aerobic tank by using a facultative membrane bioreactor, adding a reducing agent, filtering by using an activated carbon filtering process, and settling to obtain the filtered industrial wastewater; D. membrane filtration: and C, filtering the filtered industrial wastewater in the step C by adopting a security filtration process, then filtering by adopting a microfiltration membrane filtration process, then filtering by adopting an ultrafiltration membrane filtration process, and finally filtering by adopting a reverse osmosis membrane filtration process to obtain the discharged water meeting the environmental protection standard.
The flocculant comprises the following raw materials in parts by weight: 40 parts of ferrous chloride, 10 parts of oleic acid, 4 parts of xylan and 4 parts of rubber stock solution. The addition amount of the flocculant is 40 ppm.
In the step A, air is blown into the sedimentation tank for 20min, and the treatment is carried out for 10 min. And in the step C, controlling the concentration of the activated sludge in the reaction zone of the facultative membrane bioreactor to be 6000mg/L, and enabling the hydraulic retention time of the facultative membrane bioreactor to be 6 hours. In the step C, the activated carbon in the activated carbon filtering process is granular activated carbon. In the step D, a cartridge filter is adopted in the cartridge filtering process, a microfiltration membrane filter is adopted in the microfiltration membrane filtering process, an ultrafiltration membrane filter is adopted in the ultrafiltration membrane filtering process, and a reverse osmosis membrane filter is adopted in the reverse osmosis membrane filtering process.
Comparative example 1
The preparation process was substantially the same as that of example 1 except that the raw materials for the wastewater treatment process for food industry were deficient in xylan, rubber stock solution, and oleic acid.
Comparative example 2
The preparation process was substantially the same as that of example 1 except that xylan was absent from the raw materials for the wastewater treatment process in the food industry.
Comparative example 3
The process was substantially the same as that of example 1 except that the raw materials for the wastewater treatment process for food industry were deficient in rubber stock.
Comparative example 4
The preparation process was substantially the same as that of example 1 except that oleic acid was absent from the raw materials used in the wastewater treatment process for the preparation of food industry.
Comparative example 5
The method described in example 1 of the method for treating wastewater from food industry (publication No. CN106348523A) in the Chinese patent application is used.
Comparative example 6
The preparation process is basically the same as that of example 1, except that the raw materials for preparing the food industry wastewater treatment process comprise 12 parts of oleic acid, 2 parts of xylan and 1 part of rubber stock solution.
Comparative example 7
The preparation process is basically the same as that of example 1, except that the raw materials for preparing the food industry wastewater treatment process comprise 6 parts of oleic acid, 10 parts of xylan and 6 parts of rubber stock solution.
Comparative example 8
The preparation process is basically the same as that of example 1, except that the raw materials for preparing the food industry wastewater treatment process comprise 12 parts of oleic acid, 10 parts of xylan and 1 part of rubber stock solution.
Using the processes of examples 1-3 and comparative examples 1-8, the effluent from the local food processing facility was tested, and the turbidity removal rate was measured using a turbidity tester and the organic matter solute removal rate was measured using a COD tester, with the results shown in the following tables.
From the above table, it can be seen that: (1) as can be seen from the data of examples 1 to 3 and comparative example 5, the flocculation capacity and organic matter solute removal rate of the food industry wastewater treatment process prepared in examples 1 to 3 were significantly higher than those of the food industry wastewater treatment process prepared in comparative example 5; meanwhile, as can be seen from the data of examples 1 to 3, example 1 is the most preferred example.
(2) As can be seen from the data of example 1 and comparative examples 1-4, the oleic acid, xylan and rubber stock solution play a synergistic role in the treatment process for preparing the food industry wastewater, and the flocculation capacity and the removal rate of organic dissolved matters of the food industry wastewater treatment process are synergistically improved; this is:
the invention is favorable for denitrification treatment in the subsequent process by adjusting the pH value of the sewage in advance, the anaerobic aeration tank decomposes macromolecular carbon source substances and macromolecular nitrogen source substances therein by using anaerobic bacteria, then the anaerobic aeration tank is introduced into the aerobic tank, decomposes micromolecular carbon source substances and micromolecular nitrogen source substances in the wastewater by using the aerobic bacteria, and then the facultative membrane bioreactor is used for treating the wastewater flowing out of the aerobic tank, thereby improving the sewage treatment effect. But the flocculation capacity and the removal rate of organic dissolved matters are not satisfactory when ferrous chloride is used as a flocculating agent alone, so that the applicant finds that oleic acid, xylan and rubber stock solution play a synergistic role in the treatment process of preparing the food industry wastewater through repeated experiments.
The probable mechanism is presumed to be that xylan is a main component of plant hemicellulose, has good adsorbability on suspended particles to form agglomerates so as to enhance the flocculation effect, is a highly branched heterogeneous polysaccharide, and has a hydrogen bond chelating effect and a good adsorption effect on dissolved organic matters in sewage due to a highly branched structure; the macromolecular chains of the rubber stock solution are in a random-winding curve cluster shape, the internal space structure of the rubber stock solution can have a good adsorption and agglomeration effect on soluble organic matters in water due to nitrogen organic matters, suspended particles of the rubber stock solution have an agglomeration core effect, the flocculation effect can be enhanced, and the branched chains of the macromolecular chains have a gel state performance, can lock and dissolve the organic matters, can enable long-chain molecules of xylan to penetrate into the branched chains, increase the hydrophilicity of the xylan, improve the suspension capacity, prevent the xylan from settling, increase the retention suspension time and enhance the flocculation effect; oleic acid is a weakly acidic surfactant, can partially complex ferrous ions, improves the stability of the ferrous ions, and can be combined with hydroxyl of xylan through hydrogen bond action, so that the dispersibility and the retention time of xylan in water are enhanced, meanwhile, the macromolecular structure of rubber in rubber stock solution can be softened, the space volume of the macromolecular structure is enhanced, the adsorption effect is improved, a gel area formed by branched chains of rubber particles can be stabilized, the stability of adsorption of dissolved organic matters by the rubber particles is enhanced, and a better flocculation effect and a removal rate of the dissolved organic matters are generated.
(3) As can be seen from the data of comparative examples 6-8, the weight ratios of oleic acid, xylan, and rubber stock solution are not (8-10): (4-8): (2-4), the flocculation capacity and the organic matter solute removal rate of the flocculant obtained were significantly different from those of examples 1-3, and were much smaller than those of examples 1-3, which were equivalent to those of the prior art (comparative example 5). The oleic acid, xylan and rubber stock solution are used as a reinforcing system, and the oleic acid, xylan and rubber stock solution are added in the treatment process of controlling and preparing the food industry wastewater in the examples 1 to 3 according to the weight ratio of (8-10): (4-8): (2-4), hydrogen bond chelation and good adsorption effect of dissolved organic matters in the sewage are realized by utilizing the high-degree branch structure of the xylan in the reinforcing system; the internal space structure of the macromolecular chain of the rubber stock solution can have good adsorption and agglomeration effects on soluble organic matters dissolved in water, and long-chain molecules of xylan can be inserted into the macromolecular chain, so that the hydrophilicity of the xylan is increased, the suspension capacity is improved, the retention suspension time is prolonged, and the flocculation effect is enhanced; oleic acid passes through the hydroxyl combination of hydrogen bond effect with xylan to reinforcing xylan's dispersibility and dwell time in the water, it can soften the macromolecular structure of rubber in the rubber stoste simultaneously, thereby strengthen its space volume and improve adsorption effect, and can stabilize the gel region that rubber particle's branch formed, the reinforcing dissolves the stability that the organic matter was adsorbed by rubber particle, thereby realized oleic acid, xylan, rubber stoste has played the technological effect of reinforcing flocculation ability in coordination and dissolving organic matter adsorption capacity in sewage treatment.
The above description should not be taken as limiting the invention to the embodiments, but rather, as will be apparent to those skilled in the art to which the invention pertains, numerous simplifications or substitutions may be made without departing from the spirit of the invention, which shall be deemed to fall within the scope of the invention as defined by the claims appended hereto.
Claims (8)
1. The food industry wastewater treatment process is characterized by comprising the following operation steps: A. primary filtering and sedimentation: firstly, allowing the food industrial wastewater to flow through a multiple grid, then discharging the food industrial wastewater into a sedimentation tank, adding a flocculating agent for flocculation, blowing air in, and then performing sedimentation treatment to obtain a supernatant of the industrial wastewater; B. ultraviolet sterilization and pH value adjustment: discharging the supernatant of the industrial wastewater in the step A into an acid-base adjusting tank, sterilizing and disinfecting by using ultraviolet rays, removing peculiar smell, and adjusting the pH value to 5.5-7.5 to obtain the industrial wastewater with the acid-base value adjusted; C. bacterial decomposition and activated carbon filtration: introducing the industrial wastewater with the pH value adjusted in the step B into an anaerobic aeration tank, decomposing macromolecular carbon source substances and macromolecular nitrogen source substances by using anaerobic bacteria, introducing the industrial wastewater into an aerobic tank, decomposing micromolecular carbon source substances and micromolecular nitrogen source substances in the wastewater by using aerobic bacteria, treating the wastewater flowing out of the aerobic tank by using a facultative membrane bioreactor, adding a reducing agent, filtering by using an activated carbon filtering process, and settling to obtain the filtered industrial wastewater; D. membrane filtration: filtering the filtered industrial wastewater in the step C by adopting a security filtration process, then filtering by adopting a microfiltration membrane filtration process, then filtering by adopting an ultrafiltration membrane filtration process, and finally filtering by adopting a reverse osmosis membrane filtration process to obtain the discharged water meeting the environmental protection standard; the flocculant comprises ferrous chloride, oleic acid, xylan and rubber stock solution, wherein the proportion of the oleic acid to the xylan to the rubber stock solution is (8-10): (4-8): (2-4); the flocculant is in parts by weight.
2. The food industry wastewater treatment process of claim 1, wherein the ratio of the oleic acid, xylan and rubber stock solution is 9: 6: 3.
3. the food industry wastewater treatment process according to claim 1, wherein the flocculant comprises the following raw materials in parts by weight: 40-60 parts of ferrous chloride, 8-10 parts of oleic acid, 4-8 parts of xylan and 2-4 parts of rubber stock solution.
4. The food industry wastewater treatment process according to claim 1, wherein the flocculant comprises the following raw materials in parts by weight: 50 parts of ferrous chloride, 9 parts of oleic acid, 6 parts of xylan and 3 parts of rubber stock solution.
5. The food industry wastewater treatment process according to claim 1, wherein the flocculant is added in an amount of 40 to 60 ppm.
6. The food industry wastewater treatment process as claimed in claim 1, wherein in the step C, the activated sludge concentration in the reaction zone of the facultative membrane bioreactor is controlled to be 2000-6000mg/L, so that the hydraulic retention time of the facultative membrane bioreactor is 6-9 hours.
7. The food industry wastewater treatment process according to claim 1, wherein in the step C, the activated carbon in the activated carbon filtration process is granular activated carbon.
8. The food industrial wastewater treatment process according to claim 1, wherein in step D, the cartridge filter is adopted as the cartridge filter, the microfiltration membrane filter is adopted as the microfiltration membrane filter, the ultrafiltration membrane filter is adopted as the ultrafiltration membrane filter, and the reverse osmosis membrane filter is adopted as the reverse osmosis membrane filter.
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| CN104529061A (en) * | 2014-12-13 | 2015-04-22 | 山东永泰化工有限公司 | Treatment process for rubber accelerator production wastewater |
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