CN115504598B - Wastewater treatment and recycling process for gelatin production workshop - Google Patents
Wastewater treatment and recycling process for gelatin production workshop Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 57
- 230000008569 process Effects 0.000 title claims abstract description 31
- 238000004064 recycling Methods 0.000 title claims abstract description 17
- 238000004065 wastewater treatment Methods 0.000 title abstract description 12
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000012528 membrane Substances 0.000 claims abstract description 59
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 43
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- 238000001914 filtration Methods 0.000 claims abstract description 6
- 238000004062 sedimentation Methods 0.000 claims description 39
- 238000004140 cleaning Methods 0.000 claims description 17
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical group Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 16
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Classifications
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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
-
- 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
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
-
- 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
- C02F2303/14—Maintenance of water treatment installations
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
A process for treating and recycling wastewater in a gelatin production workshop comprises the following steps: step one: collecting raw water; step two: filtering with filter cloth; step three: ceramic membrane treatment; step four: and (5) ultrafiltration treatment. Experiments prove that the process can realize that the COD removal rate of the wastewater reaches 85-90%, the protein removal rate reaches 90%, the concentration ratio of the wastewater reaches 75%, and the lost collagen in the production process can be successfully separated from the gelatin production wastewater. On one hand, the recycling of protein is realized, the treated wastewater can be recycled in the production process of gelatin, the aim of wastewater recycling is fulfilled, the problem of high water consumption of a gelatin production workshop is solved, and the wastewater treatment efficiency is high.
Description
Technical Field
The invention belongs to the field of industrial wastewater treatment, and is applied to wastewater treatment and recycling in a gelatin production workshop.
Background
The collagen is moderately hydrolyzed and thermally denatured to obtain the gelatin. The gelatin is produced mainly by using animal skin, bones, leftover materials of leather production and the like as raw materials, and the common gelatin in the market mainly uses cow bones or pig skins as raw materials. The production mainly comprises three working procedures: the collection, preservation and pretreatment of raw hide and bone by various modes are the pre-process part of the development of gelatin technology, collagen degradation, namely gelatin extraction, is the second process part and also the key part affecting the yield, and the filtering, evaporation, sterilization, drying and the like of the gelatin form the post-process part of the gelatin technology. At present, the production methods of gelatin mainly comprise an alkaline method, an acid method, an enzyme method and the like.
The most adopted gelatin production process at present is a typical alkali gelatin production process, and the main processes comprise material selection, degreasing, alkali leaching, decoloration, water washing neutralization and gelatin extraction. The gelatin wastewater comes from each process of the gelatin production process, and in the production operation, the production water in the subsequent working section mainly comes from the previous working procedure, and finally, the production wastewater is mainly discharged through water washing, degreasing and washing. The gelatin production wastewater belongs to high-concentration organic wastewater, the COD can reach 2000-10000 mg/L generally, and the pH, suspended matters and grease content in the wastewater are higher. Meanwhile, because the gelatin production is intermittent operation, the discharge of gelatin wastewater is difficult to control, and the fluctuation of water quality and water quantity is large. Aiming at the characteristics of gelatin wastewater, and the pollutant components in the wastewater are complex, the traditional biochemical method has high treatment difficulty. Thus, with respect to the complexity of the quality of gelatin wastewater, it is difficult to achieve emission standards by means of a single biological treatment alone. Therefore, in practical applications, several pretreatment processes are often employed in combination with biological treatment methods to treat gelatin wastewater. However, treatment with the activated sludge process produces a large amount of calcium-containing excess sludge, increasing the cost of sludge treatment. Although the methods such as a physicochemical method and a biochemical method have good effect on the aspect of gelatin wastewater treatment, the problems of large mud yield, strict operation technical requirements and the like still exist in the treatment process.
Ultrafiltration is widely applied to wastewater treatment containing collagen due to the advantages of low energy consumption, no phase change, simple operation, good separation effect and the like in the separation technology. The ultrafiltration method can coagulate and settle macromolecular suspended matters and colloidal particles in the wastewater through the actions of charge adsorption, bridging and the like, and effectively reduces the content of suspended matters and macromolecular proteins in the wastewater, thereby reducing the pollution degree of an ultrafiltration membrane and achieving the purposes of wastewater treatment and protein recovery.
In conclusion, the wastewater produced in the gelatin production workshop has the characteristics of high content of alkali-soluble protein, grease and mechanical impurities, and the production belongs to intermittent operation, so that the water quality and the water quantity of the wastewater are greatly changed, and the gelatin wastewater is difficult to treat. Due to the characteristics of gelatin wastewater, the conventional treatment method cannot achieve a satisfactory effect. There is therefore a need to provide a new process that solves the above mentioned problems.
Disclosure of Invention
The invention aims to solve the defects and provides a wastewater treatment and recycling process for a gelatin production workshop.
The invention is realized by adopting the following technical scheme.
The invention relates to a wastewater treatment and recycling process for a gelatin production workshop, which comprises the following steps of: step one: collecting raw water; step two: filtering with filter cloth; step three: ceramic membrane treatment; step four: and (5) ultrafiltration treatment.
The method comprises the following steps: raw water is collected, raw water under various working conditions of production of a gelatin workshop is collected, the raw water enters a sedimentation tank for sedimentation pretreatment after passing through a grid respectively, and the adopted sedimentation method is an isoelectric point sedimentation method.
The isoelectric point precipitation method comprises the steps of regulating pH to 4.6-5.8 of isoelectric point of collagen, wherein the sedimentation rate is the fastest, and the removal rate of COD and protein is the best; the reagent used is 1mol/L hydrochloric acid, and the hydraulic retention time in the sedimentation tank is 5-7 h.
The invention comprises the following steps: the filter cloth filters, and gelatin wastewater subjected to sedimentation pretreatment flows out of a sedimentation tank and then enters a water collecting tank with nylon filter cloth above.
The pore diameter of the filter cloth is 80-100 meshes, and the filter cloth can intercept residual gelatin particles and collagen in the wastewater, so that the recovery of the gelatin particles and the collagen is realized; the filter cloth is replaced every 4 to 8 hours.
The invention comprises the following steps: the ceramic membrane treatment comprises that the wastewater after being filtered by filter cloth is concentrated and collected in a water collecting tank and then enters a ceramic membrane treatment system through a water inlet pipe.
The pore diameter of the ceramic membrane is 50nm, and through orthogonal test of a ceramic membrane treatment system, the optimal conditions of the system operation are as follows: the pH value is 8, the temperature is 35 ℃, and the pressure is 0.3MPa.
The invention comprises the following steps: ultrafiltration treatment, comprising the use of ultrafiltration membranes: the polyether sulfone ultrafiltration membrane is subjected to ultrafiltration treatment, the molecular weight cut-off is 8000, and the parameters are as follows after the orthogonal test of the ultrafiltration membrane system: the pH value is 8, the temperature is 30 ℃, and the pressure is 0.7MPa.
The process comprises the steps of 1) circulating concentrated water after a ceramic membrane treatment system flows back to a sedimentation tank through a return pipeline for sedimentation pretreatment, and carrying out a new round of treatment circulation again; 2) The concentrated water passing through the ultrafiltration system also flows back to the sedimentation tank of the first step through a return pipeline to carry out the recycling treatment again, and the ultrafiltered produced water can be recycled to a gelatin production workshop through a pipeline.
The process comprises a cleaning step, wherein the ceramic membrane system and the ultrafiltration system are cleaned regularly; 1) When the system is running, firstly, 5% hydrochloric acid solution is adopted for cleaning; 2) When the sewage is blocked, the sewage is cleaned by 5% protease solution.
The invention has the beneficial effects that 1) aiming at the characteristics and the treatment difficulty of gelatin wastewater, the research is to adopt the treatment process of an inorganic ceramic membrane system and an ultrafiltration membrane system, and the experiment proves that the COD removal rate of the wastewater reaches 85-90%, the protein removal rate reaches 90%, the concentration ratio of the wastewater reaches 75%, and the collagen lost in the production process can be successfully separated from the gelatin production wastewater. 2) The process has the advantages of simple operation process, flexible mode and higher automation degree. 3) On the one hand, the invention realizes the recycling of protein, and the treated wastewater can be recycled in the production process of gelatin, thereby realizing the aim of wastewater reuse, solving the problem of high water consumption in a gelatin production workshop and having high wastewater treatment efficiency.
The invention is further explained below with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a process flow diagram;
FIG. 2 shows the COD after precipitation with time;
FIG. 3 is a graph showing protein in wastewater after precipitation over time;
FIG. 4 is a diagram showing the COD of wastewater according to the treatment steps;
FIG. 5 shows the variation of protein in gelatin wastewater with experimental steps;
FIG. 6 is a graph of treatment effect (from left to right, after precipitation, after ceramic membrane concentration, ultrafiltration membrane concentration, after filtration, after ceramic membrane, after ultrafiltration membrane);
FIG. 7 is a graph comparing the different precipitation modes.
Detailed Description
According to the water quality characteristics of the gelatin production wastewater, the production wastewater is treated by adopting the following treatment procedures, the protein concentration, COD and pH in each treatment procedure are measured, and the difference before and after analysis and comparison are carried out to obtain the treatment efficiency of the method on the wastewater, wherein the treatment process flow is shown in figure 1.
The invention relates to a wastewater treatment and recycling process for a gelatin production workshop, which comprises the following steps of: step one: collecting raw water; step two: filtering with filter cloth; step three: ceramic membrane treatment; step four: and (5) ultrafiltration treatment.
The method comprises the following steps: raw water is collected, raw water under various working conditions of production of a gelatin workshop is collected, the raw water enters a sedimentation tank for sedimentation pretreatment after passing through a grid respectively, and the adopted sedimentation method is an isoelectric point sedimentation method.
The isoelectric point precipitation method comprises the steps of regulating pH to 4.6-5.8 of isoelectric point of collagen, wherein the sedimentation rate is the fastest, and the removal rate of COD and protein is the best; the reagent used is 1mol/L hydrochloric acid, and the hydraulic retention time in the sedimentation tank is 5-7 h.
The invention comprises the following steps: the filter cloth filters, and gelatin wastewater subjected to sedimentation pretreatment flows out of a sedimentation tank and then enters a water collecting tank with nylon filter cloth above.
The pore diameter of the filter cloth is 80-100 meshes, and the filter cloth can intercept residual gelatin particles and collagen in the wastewater, so that the recovery of the gelatin particles and the collagen is realized; the filter cloth is replaced every 4 to 8 hours.
The invention comprises the following steps: the ceramic membrane treatment comprises that the wastewater after being filtered by filter cloth is concentrated and collected in a water collecting tank and then enters a ceramic membrane treatment system through a water inlet pipe.
The pore diameter of the ceramic membrane is 50nm, and through orthogonal test of a ceramic membrane treatment system, the optimal conditions of the system operation are as follows: the pH value is 8, the temperature is 35 ℃, and the pressure is 0.3MPa.
The invention comprises the following steps: ultrafiltration treatment, comprising the use of ultrafiltration membranes: the polyether sulfone ultrafiltration membrane is subjected to ultrafiltration treatment, the molecular weight cut-off is 8000, and the parameters are as follows after the orthogonal test of the ultrafiltration membrane system: the pH value is 8, the temperature is 30 ℃, and the pressure is 0.7MPa.
The process comprises the steps of 1) circulating concentrated water after a ceramic membrane treatment system flows back to a sedimentation tank through a return pipeline for sedimentation pretreatment, and carrying out a new round of treatment circulation again; 2) The concentrated water passing through the ultrafiltration system also flows back to the sedimentation tank of the first step through a return pipeline to carry out the recycling treatment again, and the ultrafiltered produced water can be recycled to a gelatin production workshop through a pipeline.
The process comprises clear steps, namely cleaning a ceramic membrane system and an ultrafiltration system at regular intervals; 1) When the system is running, firstly, 5% hydrochloric acid solution is adopted for cleaning; 2) When the sewage is blocked, the sewage is cleaned by 5% protease solution.
3.1 Study of the treatment Effect of different precipitation modes on gelatin production wastewater
Precipitating the gelatin production wastewater by adopting precipitation modes such as isoelectric point, natural sedimentation, thermal denaturation and the like, measuring the concentration of COD and protein of supernatant fluid after precipitation, examining the influence of the precipitation mode on the water quality of the gelatin production wastewater, and examining the influence of the precipitation time on the water quality of the gelatin production wastewater. The experimental results of the different precipitation modes are shown in Table 3-1.
TABLE 3-1 precipitation experiment results table
The same raw water is adopted during precipitation, the protein content is 7.41mg/mL, and the COD is 3300mg/L. Analysis of the post-precipitation experimental results can be obtained: when the pH of the gelatin production wastewater is regulated to the isoelectric point of the collagen of 5.8, the COD removal rate after 2 hours is 44.36%, and the protein removal rate is 26.37%. The gelatin production wastewater is allowed to naturally settle, the COD removal rate after 2 hours is 43.45%, and the protein removal rate is 35.28%. The gelatin production wastewater is heated to 40 ℃, the COD removal rate is 13.33% after 2 hours, and the protein removal rate is 16.91%. From the sedimentation effect analysis, natural sedimentation is more beneficial to removing protein and COD in water, and from the sedimentation rate analysis, the isoelectric point sedimentation rate is faster than that of the other two sedimentation modes.
3.2 Selection of protein separation Membrane in gelatin production wastewater
According to the molecular weight distribution of protein in the wastewater, four indexes of permeation flux, membrane attenuation coefficient, protein retention rate and total protein transmittance of various membranes are examined, and a membrane suitable for protein separation in the wastewater in gelatin production is selected.
3.2.1 Selection of separation membranes in ceramic Membrane treatment System
The gelatin production wastewater belongs to high-concentration organic wastewater, has the COD of 2000-10000 mg/L generally and contains more impurities, and compared with other organic membranes, the inorganic ceramic membrane has the advantages of high temperature resistance, good chemical stability, high mechanical strength, little pollution, long service life and other organic polymers, is made of inorganic inert materials, is acid-base resistant and oxidant-resistant, is easy and convenient to clean, can efficiently treat high-turbidity raw water, is not easy to block, is not easy to produce bacterial breeding, has large membrane surface flow velocity and is not easy to deposit. In combination with the water quality characteristics of the gelatin production wastewater and the field test analysis, the research selects an inorganic ceramic membrane with the pore diameter of 50nm as a pretreatment unit.
3.2.2 Selection of ultrafiltration membranes in an Ultrafiltration System
Currently, there are many materials for manufacturing ultrafiltration membranes in the market, such as polyvinylidene fluoride (PVDF), polyethersulfone (PES), polypropylene (PP), polyethylene (PE), polysulfone (PS), polyacrylonitrile (PAN), polyvinyl chloride (PVC), etc., and polyvinylidene fluoride (PVDF) and Polyethersulfone (PES) are the most widely used ultrafiltration membrane materials in the water treatment industry. When ultrafiltration is applied to water treatment, the chemical stability and hydrophilicity of the material are two of the most important properties. The chemical stability determines the service life of the material under the actions of acid and alkali, oxidant, microorganism and the like, and is directly related to the selection of a cleaning mode; hydrophilicity characterizes the adsorption degree of the membrane material to organic pollutants in water, and mainly influences the flux of the membrane.
Polyvinylidene fluoride and polyethersulfone have good chemical stability and hydrophilicity, but the price of polyvinylidene fluoride is more expensive than that of polyethersulfone, and the polyethersulfone ultrafiltration membrane with the molecular weight cutoff of 8000 is determined to be used as the material of the test by combining the practical application and the property of wastewater.
Results 4 results
And treating the gelatin production wastewater by adopting an equal electrolytic sedimentation pretreatment, an inorganic ceramic membrane treatment system and an ultrafiltration treatment process, respectively carrying out 7 continuous tests on the wastewater in a gelatin production workshop for 7 days, and detecting the water quality treated by each test section, wherein the experimental data result is shown in the following table and the lower graph.
The COD removal efficiency of the wastewater by the treatment method can reach more than 85%, the protein removal rate can reach more than 85%, and the organic matter content and turbidity in the wastewater can be effectively reduced, so that the wastewater is purified, the treated wastewater can be continuously recycled and recycled in a washing workshop. The method can concentrate the wastewater by approximately 3 times, greatly reduces the wastewater quantity and is beneficial to the subsequent treatment of the residual wastewater.
TABLE 4-1 experiment 1 wastewater quality and treatment effect
TABLE 4-2 experiment 2 wastewater quality and treatment Effect
TABLE 4-3 experiment 3 wastewater quality and treatment effect
Table 4-4 experiment 4 wastewater quality and treatment effect
TABLE 4-5 experiment 5 wastewater quality and treatment Effect
Tables 4-6 experiment 6 wastewater quality and treatment effect
TABLE 4-7 experiment 7 wastewater quality and treatment effect
Tables 4-8 Experimental results statistics
4.1 Orthogonal experimental analysis of ceramic Membrane treatment
The experiment adopts an L 27(39) table to carry out orthogonal experiments on three factors of pH, temperature and pressure in the culture condition, a set of scheme is designed, and the optimal condition of system operation under the laboratory condition is researched.
According to the single factor experimental result, three levels are taken in a smaller range of the optimal condition, and the orthogonal experimental factor level of the system operation is shown in tables 4-9; the results of the orthogonal test and their range analysis are shown in tables 4-10.
Tables 4-9 ceramic membrane treatment orthogonal experiment factor level table
Tables 4-10 orthogonal experimental analysis of ceramic membrane treatment
As can be seen from the extreme differences in the analysis values of the factors in tables 4 to 10, the effect of the factors on the water production flow rate was of the magnitude of pH > pressure (MPa) > temperature. This suggests that the pH factor is the dominant one, with the greatest effect on the water production flow. Comparing the average value of the factors, the K values of the corresponding levels of the 3 factors are A (2), B (2) and C (3), wherein the K values are the highest, and the optimal conditions of the system operation are as follows: the pH value is 8, the temperature is 35 ℃, and the pressure is 0.3MPa.
4.2 Ultrafiltration orthogonal Experimental analysis
The experiment adopts an L 27(39) table to carry out orthogonal experiments on three factors of pH, temperature and pressure in the culture condition, a set of scheme is designed, and the optimal condition of system operation under the laboratory condition is researched.
According to the single factor experimental result, three levels are taken in a smaller range of the optimal condition, and the orthogonal experimental factor level of the system operation is shown in tables 4-11; the results of the orthogonal experiments of ultrafiltration and their very poor analysis are shown in tables 4-12.
Tables 4-11 Ultrafiltration orthogonal experiment factor level Table
Tables 4-12 Ultrafiltration orthogonal experimental analysis
As can be seen from the extreme differences in the analysis values of the factors in tables 4 to 12, the effect of the factors on the water production flow rate was of the magnitude of pressure > temperature (. Degree. C.) > pH. This illustrates that the pressure value is the dominant factor, with the greatest impact on the produced water flow. Comparing the average value of the factors, the K values of the corresponding levels of the 3 factors are A (1), B (3) and C (3), wherein the K values are the highest, and the optimal conditions of the system operation are as follows: the pH value is 8, the temperature is 30 ℃, and the pressure is 0.7MPa.
4.3 Exploration of Membrane cleaning Effect by different cleaning methods
Pretreatment and ultrafiltration systems are used for sewage treatment, and fouling of membranes is unavoidable. The membrane fouling is mainly manifested as: the water yield is reduced, the quality of the produced water is poor, the transmembrane pressure difference is increased along with the increase of the water inlet pressure, and a certain yarn breakage phenomenon occurs in the ultrafiltration membrane system, and the larger the transmembrane pressure difference is, the more serious the yarn breakage phenomenon is.
The main reasons for the fouling of the pretreatment and ultrafiltration systems are: the water inlet temperature is too low, so that the running resistance is increased; the raw water suspension and colloid substances are too much; the inflow is larger, which exceeds the water production capacity of the system; the water inlet pressure is larger; incomplete chemical cleaning results in slow release of residual chemical substances, causing irreversible damage to the system.
The main characteristics of the gelatin production wastewater are that the suspended matters and the colloid substances are high in content, and the organic matters are high in content. For the water quality characteristics of this wastewater, water washing, 5% sodium hydroxide washing, 5% hydrochloric acid washing, and 5% protease washing were decided. The cleaning effect is shown in tables 4-13.
Tables 4 to 13 film cleaning mode results
According to the experimental results, the four cleaning modes have the best effect of cleaning the membrane by using a 5% protease solution, but the price of the protease is relatively high, and the 5% hydrochloric acid solution is suggested to be used for cleaning when the system is in operation, and the 5% protease solution is suggested to be used for cleaning when serious fouling occurs.
The foregoing description is only a few specific embodiments of the present application (since the formulation of the present application includes numerical ranges, the embodiments are not intended to be exhaustive, and the scope of the present application includes numerical ranges and other technical gist ranges), and the details or common knowledge of the present application is not described in any more detail herein. It should be noted that the above embodiments do not limit the present application in any way, and it is within the scope of the present application for those skilled in the art to obtain the technical solution by equivalent substitution or equivalent transformation. The protection scope of the present application is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (4)
1. The process for treating and recycling the wastewater in the gelatin production workshop is characterized by comprising the following steps of:
Step one: collecting raw water; raw water under various working conditions of production of a gelatin workshop is collected and enters a sedimentation tank for sedimentation pretreatment after passing through a grating respectively, wherein the adopted sedimentation method is an isoelectric point sedimentation method; the isoelectric point precipitation method comprises the steps of adjusting the pH value to 4.6-5.8; the reagent is hydrochloric acid with the concentration of 1mol/L, and the hydraulic retention time in the sedimentation tank is 5-7 h;
step two: filtering with filter cloth; the gelatin wastewater subjected to sedimentation pretreatment flows out of a sedimentation tank and then enters a water collecting tank with nylon filter cloth above; the pore diameter of the filter cloth is 80-100 meshes, and the filter cloth can intercept residual gelatin particles and collagen in the wastewater, so that the recovery of the gelatin particles and the collagen is realized;
step three: ceramic membrane treatment; the wastewater after being filtered by filter cloth is concentrated and collected in a water collecting tank and then enters a ceramic membrane treatment system through a water inlet pipe; the pore diameter of the ceramic membrane is 50nm, and the optimal conditions for system operation are as follows: the pH value is 8, the temperature is 35 ℃, and the pressure is 0.3MPa;
Step four: ultrafiltration treatment; including the use of ultrafiltration membranes: carrying out ultrafiltration treatment on the polyether sulfone ultrafiltration membrane, wherein the molecular weight cut-off is 8000; the parameter conditions are as follows: the pH value is 8, the temperature is 30 ℃, and the pressure is 0.7MPa.
2. The process for treating and recycling wastewater from a gelatin production plant according to claim 1, wherein the filter cloth is replaced every 4 to 8 hours.
3. The process for treating and recycling wastewater in a gelatin production plant according to claim 1, wherein the process comprises the steps of 1) circulating concentrated water after a ceramic membrane treatment system back to a sedimentation tank through a return pipeline for sedimentation pretreatment, and carrying out a new round of treatment circulation again; 2) The concentrated water passing through the ultrafiltration system also flows back to the sedimentation tank of the first step through a return pipeline to carry out the recycling treatment again, and the ultrafiltered produced water can be recycled to a gelatin production workshop through a pipeline.
4. The process for treating and recycling wastewater from a gelatin production plant according to claim 1, wherein said process comprises a cleaning step for cleaning the ceramic membrane treatment system and the ultrafiltration system at regular intervals; 1) When the system is running, firstly, 5% hydrochloric acid solution is adopted for cleaning; 2) When the sewage is blocked, the sewage is cleaned by 5% protease solution.
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