CN115504598A - Gelatin production workshop wastewater treatment and recycling process - Google Patents
Gelatin production workshop wastewater treatment and recycling process Download PDFInfo
- Publication number
- CN115504598A CN115504598A CN202211150931.0A CN202211150931A CN115504598A CN 115504598 A CN115504598 A CN 115504598A CN 202211150931 A CN202211150931 A CN 202211150931A CN 115504598 A CN115504598 A CN 115504598A
- Authority
- CN
- China
- Prior art keywords
- wastewater
- treatment
- gelatin
- ultrafiltration
- production workshop
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 108010010803 Gelatin Proteins 0.000 title claims abstract description 78
- 229920000159 gelatin Polymers 0.000 title claims abstract description 78
- 239000008273 gelatin Substances 0.000 title claims abstract description 78
- 235000019322 gelatine Nutrition 0.000 title claims abstract description 78
- 235000011852 gelatine desserts Nutrition 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 68
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 64
- 230000008569 process Effects 0.000 title claims abstract description 36
- 238000004064 recycling Methods 0.000 title claims abstract description 24
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 17
- 239000002351 wastewater Substances 0.000 claims abstract description 80
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000012528 membrane Substances 0.000 claims abstract description 65
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 46
- 239000000919 ceramic Substances 0.000 claims abstract description 31
- 239000004744 fabric Substances 0.000 claims abstract description 22
- 102000008186 Collagen Human genes 0.000 claims abstract description 15
- 108010035532 Collagen Proteins 0.000 claims abstract description 15
- 229920001436 collagen Polymers 0.000 claims abstract description 15
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 238000004062 sedimentation Methods 0.000 claims description 37
- 238000004140 cleaning Methods 0.000 claims description 21
- 238000001556 precipitation Methods 0.000 claims description 18
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 16
- 108091005804 Peptidases Proteins 0.000 claims description 7
- 239000004695 Polyether sulfone Substances 0.000 claims description 7
- 239000004365 Protease Substances 0.000 claims description 7
- 102100037486 Reverse transcriptase/ribonuclease H Human genes 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 229920006393 polyether sulfone Polymers 0.000 claims description 7
- 238000010992 reflux Methods 0.000 claims description 6
- 239000004677 Nylon Substances 0.000 claims description 3
- 239000003153 chemical reaction reagent Substances 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims 1
- 102000004169 proteins and genes Human genes 0.000 abstract description 22
- 108090000623 proteins and genes Proteins 0.000 abstract description 22
- 238000002474 experimental method Methods 0.000 abstract description 21
- 230000000694 effects Effects 0.000 description 19
- 239000000126 substance Substances 0.000 description 13
- 238000004458 analytical method Methods 0.000 description 12
- 238000012360 testing method Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 238000005406 washing Methods 0.000 description 8
- 239000002033 PVDF binder Substances 0.000 description 6
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 6
- 238000000926 separation method Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- -1 after precipitation Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 210000000988 bone and bone Anatomy 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229920012266 Poly(ether sulfone) PES Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000002306 biochemical method Methods 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 238000004925 denaturation Methods 0.000 description 2
- 230000036425 denaturation Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
- 229920002492 poly(sulfone) Polymers 0.000 description 2
- 229920002239 polyacrylonitrile Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000013211 curve analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000006911 enzymatic reaction Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000010874 maintenance of protein location Effects 0.000 description 1
- 238000009285 membrane fouling Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- 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
Abstract
A gelatin production workshop wastewater treatment and recycling process comprises the following steps: the method comprises the following steps: collecting raw water; step two: filtering with filter cloth; step three: ceramic membrane treatment; step four: and (4) performing ultrafiltration treatment. Experiments prove that the process can realize that the removal rate of COD in the wastewater reaches 85-90%, the removal rate of protein reaches 90%, the concentration ratio of the wastewater reaches 75%, and collagen lost in the production process can be successfully separated from the wastewater in the production of gelatin. On one hand, the recycling of protein is realized, and meanwhile, the treated wastewater can be recycled in the production process of gelatin, so that the aim of wastewater recycling is realized, the problem of high cost of water consumption in 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 gelatin production workshops.
Background
The product of collagen obtained by mild hydrolysis and thermal denaturation is gelatin. The production of gelatin mainly takes animal skin, bones, leftover materials produced by leather and the like as raw materials, and common gelatin in the market mostly takes cow leather bones or pigskin as the raw materials. The production mainly comprises three procedures: the raw material skin and bone pretreatment by various modes from the collection and preservation of raw materials is a pre-process part of the development of the gelatin technology, the degradation of collagen, namely the extraction of gelatin is a second process part and is also a key part influencing the yield, and the filtration, evaporation, sterilization, drying and the like of the gelatin form a post-process part of the gelatin technology. At present, the production methods of gelatin mainly comprise an alkaline method, an acid method, an enzymatic method and the like.
The most typical production process of alkaline gelatin is adopted in the currently adopted gelatin production process, and the main processes comprise material selection, degreasing, alkali soaking, decoloring, water washing neutralization and gelatin extraction. The gelatin wastewater comes from each working procedure of the gelatin production process, in the production operation, the production water in the subsequent working procedure mainly comes from the previous working procedure, and finally, the production wastewater is mainly discharged through water washing, degreasing and washing. The waste water from gelatin production is high concentration organic waste water, COD is up to 2000-10000 mg/L, and the waste water has high pH, suspended matter and oil content. Meanwhile, the gelatin production is intermittent operation, so that the discharge of gelatin wastewater is difficult to control, and the water quality and water quantity fluctuation is large. Aiming at the characteristics of the gelatin wastewater, and the complex pollutant components in the wastewater, the traditional biochemical method has high treatment difficulty. Therefore, in view of the complexity of the quality of the gelatin wastewater, it is difficult to achieve the discharge standard by only a single biological treatment. Therefore, in practical applications, some pretreatment processes are often used in combination with biological treatment methods to treat the gelatin wastewater. However, treatment with the activated sludge process results in a large amount of calcium-containing excess sludge, increasing the cost of sludge treatment. Although methods such as a physical chemical method, a biochemical method and the like have good effects on the treatment of the gelatin wastewater, the problems of large sludge production, strict operation technical requirements and the like still exist in the treatment process.
The ultrafiltration has the advantages of low energy consumption, no phase change, simple operation, good separation effect and the like in the separation technology, and is widely applied to the treatment of wastewater containing collagen. The ultrafiltration method can lead macromolecular suspended matters and colloidal particles in the wastewater to be condensed and settled through the functions of charge adsorption, bridging and the like, effectively reduce the content of suspended matters and macromolecular proteins in the wastewater, thereby lightening the pollution degree of the ultrafiltration membrane and achieving the purposes of treating the wastewater and recovering the proteins.
In conclusion, the waste water generated 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 quality and the quantity of the waste water are greatly changed, and the treatment of the gelatin waste water is difficult. Due to the characteristics of the gelatin wastewater, the traditional treatment method cannot achieve satisfactory effects. Therefore, it is necessary to provide a new process to solve the above problems.
Disclosure of Invention
The invention aims to solve the defects of the problems and provides a process for treating and recycling wastewater in 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: the method comprises the following steps: collecting raw water; step two: filtering with filter cloth; step three: ceramic membrane treatment; step four: and (4) performing ultrafiltration treatment.
The method comprises the following steps: and raw water collection, including the raw water collection of each working condition of the production of the gelatin workshop, and the raw water enters a sedimentation tank for sedimentation pretreatment after passing through a grid respectively, wherein the adopted sedimentation method is an isoelectric point sedimentation method.
The isoelectric point precipitation method comprises the steps that when the pH is adjusted to the collagen isoelectric point of 4.6-5.8, the precipitation rate is fastest, and the removal rate of COD and protein is optimal; the used reagent is 1mol/L hydrochloric acid, and the hydraulic retention time in the sedimentation tank is 5-7 h.
The second step of the invention: and filtering by using filter cloth, wherein the gelatin wastewater subjected to sedimentation pretreatment flows out of the sedimentation tank and then enters a water collecting tank with nylon filter cloth above.
The aperture 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 third step: and (3) ceramic membrane treatment, which comprises the steps of carrying out concentrated collection on the wastewater filtered by the filter cloth in a water collecting tank, and then entering a ceramic membrane treatment system through a water inlet pipe.
The membrane selected by the ceramic membrane is 50nm in aperture, and the optimal system operation conditions are as follows through the orthogonal test of the ceramic membrane treatment system: the pH value is 8, the temperature is 35 ℃, and the pressure is 0.3MPa.
The method comprises the following fourth step: ultrafiltration treatment, comprising the use of ultrafiltration membranes: the polyether sulfone ultrafiltration membrane is subjected to ultrafiltration treatment, the molecular weight cutoff is 8000, the polyether sulfone ultrafiltration membrane is obtained through an orthogonal test of an ultrafiltration membrane system, and the parameter conditions are as follows: the pH value is 8, the temperature is 30 ℃, and the pressure is 0.7MPa.
The process comprises a circulating step, namely 1) refluxing concentrated water after the ceramic membrane treatment system to a sedimentation tank through a reflux pipeline for sedimentation pretreatment, and performing a new treatment cycle again; 2) And (4) returning the concentrated water passing through the ultrafiltration system through a return pipeline to enter the sedimentation tank in the first step for recycling treatment again, and recycling the ultrafiltered produced water in a gelatin production workshop through a pipeline.
The process comprises a cleaning step, namely cleaning a ceramic membrane system and an ultrafiltration system at regular intervals; 1) When the system is in operation, a 5% hydrochloric acid solution is adopted for cleaning; 2) And 5% protease solution is adopted for cleaning when dirt is blocked.
The invention has the beneficial effects that 1) aiming at the characteristics and the treatment problem of the gelatin wastewater, the research is designed to adopt the treatment process of an inorganic ceramic membrane system and an ultrafiltration membrane system, and through experimental verification, 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 collagen lost in the production process can be successfully separated from the gelatin production wastewater. 2) The invention has simple process operation, flexible mode and higher automation degree. 3) On 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 purpose of wastewater reuse, solving the problem of high water consumption and high cost 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 graph of COD after precipitation over time;
FIG. 3 is a graph of protein in wastewater after precipitation as a function of time;
FIG. 4 is a graph showing the change of COD in wastewater with the treatment steps;
FIG. 5 is a graph showing the variation of protein in gelatin wastewater with experimental procedures;
FIG. 6 is a graph showing the effect of the treatment (from left to right, raw water, after precipitation, ceramic membrane concentrated water, ultrafiltration membrane concentrated water, after filtration, after ceramic membrane, and after ultrafiltration membrane);
FIG. 7 is a graph comparing different precipitation patterns.
Detailed Description
According to the water quality characteristics of the gelatin production wastewater, the production wastewater is treated by adopting the following treatment process, the protein concentration, COD (chemical oxygen demand) and pH (potential of hydrogen) in each treatment process are measured, the difference before and after analysis and comparison are carried out, the treatment efficiency of the method on the wastewater is obtained, and 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: the method comprises the following steps: collecting raw water; step two: filtering with filter cloth; step three: ceramic membrane treatment; step four: and (4) performing ultrafiltration treatment.
The method comprises the following steps: and raw water collection, including raw water collection of each working condition of production of a gelatin workshop, and the raw water respectively enters a sedimentation tank for sedimentation pretreatment after passing through a grid, wherein the adopted sedimentation method is an isoelectric point sedimentation method.
The isoelectric point precipitation method comprises the steps that when the pH is adjusted to the collagen isoelectric point of 4.6-5.8, the precipitation rate is fastest, and the removal rate of COD and protein is optimal; the used reagent is 1mol/L hydrochloric acid, and the hydraulic retention time in the sedimentation tank is 5-7 h.
The second step of the invention: and filtering by using filter cloth, wherein the gelatin wastewater subjected to sedimentation pretreatment flows out of the sedimentation tank and then enters a water collecting tank with nylon filter cloth above.
The aperture 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 third step of the invention: and (3) ceramic membrane treatment, which comprises the steps of carrying out concentrated collection on the wastewater filtered by the filter cloth in a water collecting tank, and then entering a ceramic membrane treatment system through a water inlet pipe.
The membrane selected by the ceramic membrane is 50nm in aperture, and the optimal system operation conditions are as follows through the orthogonal test of a ceramic membrane treatment system: the pH value is 8, the temperature is 35 ℃, and the pressure is 0.3MPa.
The method comprises the following steps: ultrafiltration treatment, comprising the use of an ultrafiltration membrane: the polyether sulfone ultrafiltration membrane is subjected to ultrafiltration treatment, the molecular weight cutoff is 8000, the molecular weight cutoff is obtained through an orthogonal test of an ultrafiltration membrane system, and the parameter conditions are as follows: the pH value is 8, the temperature is 30 ℃, and the pressure is 0.7MPa.
The process comprises a circulating step, namely 1) refluxing concentrated water after the ceramic membrane treatment system to a sedimentation tank through a reflux pipeline for sedimentation pretreatment, and performing a new treatment cycle again; 2) And (4) returning the concentrated water passing through the ultrafiltration system through a return pipeline to enter the sedimentation tank in the first step for recycling treatment again, and recycling the ultrafiltered produced water in a gelatin production workshop through a pipeline.
The process comprises the clear steps of cleaning a ceramic membrane system and an ultrafiltration system at regular intervals; 1) When the system is in operation, a 5% hydrochloric acid solution is adopted for cleaning; 2) And 5% protease solution is adopted for cleaning when dirt is blocked.
3.1 study of treatment effects of different precipitation modes on gelatin production wastewater
The method comprises the steps of precipitating the gelatin production wastewater by adopting precipitation modes such as isoelectric points, natural sedimentation, thermal denaturation and the like, measuring COD (chemical oxygen demand) and protein concentration of supernatant after precipitation, inspecting the influence of the precipitation modes on the quality of the gelatin production wastewater, and inspecting the influence of precipitation time on the quality of the gelatin production wastewater. The results of the different precipitation modes are shown in Table 3-1.
TABLE 3-1 precipitation test results Table
When in precipitation, the same raw water is adopted, the protein content is 7.41mg/mL, and the COD is 3300mg/L. Analysis of the experimental results after precipitation can result in: when the pH of the gelatin production wastewater is adjusted to 5.8 of the isoelectric point of collagen, the COD removal rate is 44.36 percent and the protein removal rate is 26.37 percent after 2 hours. The gelatin production wastewater is naturally settled, and after 2 hours, the COD removal rate is 43.45 percent, and the protein removal rate is 35.28 percent. Heating the gelatin production wastewater to 40 ℃, wherein the COD removal rate is 13.33% and the protein removal rate is 16.91% after 2 hours. From the analysis of sedimentation effect, the natural sedimentation is more beneficial to removing protein and COD in water, and from the analysis of sedimentation rate, the isoelectric point sedimentation rate is faster than other two sedimentation modes.
3.2 selection of protein separation Membrane in wastewater from gelatin production
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 inspected, and the membrane suitable for protein separation in the gelatin production wastewater is selected.
3.2.1 selection of separation membranes in ceramic Membrane treatment systems
The gelatin production wastewater belongs to high-concentration organic wastewater, generally COD (chemical oxygen demand) can reach 2000-10000 mg/L, and more impurities are contained, compared with other organic membranes, the inorganic ceramic membrane has the advantages of high temperature resistance, good chemical stability, high mechanical strength, small pollution, long service life and the like which are not possessed by organic polymers, is prepared from inorganic inert materials, is acid-base-resistant and oxidant-cleaning, is simple and convenient to clean, can efficiently treat high-turbidity raw water, is not suitable for blocking, is not easy to generate 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 field test analysis, the research selects an inorganic ceramic membrane with the aperture of 50nm as a pretreatment unit.
3.2.2 selection of Ultrafiltration membranes in Ultrafiltration systems
Currently, ultrafiltration membranes are manufactured on the market from a variety of materials, such as polyvinylidene fluoride (PVDF), polyethersulfone (PES), polypropylene (PP), polyethylene (PE), polysulfone (PS), polyacrylonitrile (PAN), polyvinyl chloride (PVC), and the like, and in the water treatment industry, polyvinylidene fluoride (PVDF) and Polyethersulfone (PES) are the most widely used ultrafiltration membrane materials. When ultrafiltration is applied to water treatment, the chemical stability and hydrophilicity of the material are the two most important properties. The chemical stability determines the service life of the material under the action of acid, alkali, oxidant, microorganism and the like, and is directly related to the selection of a cleaning mode; the hydrophilicity represents the adsorption degree of the membrane material to organic pollutants in water, and mainly influences the flux of the membrane.
Polyvinylidene fluoride and polyether sulfone both have good chemical stability and hydrophilicity, but polyvinylidene fluoride is more expensive than polyether sulfone, and a polyether sulfone ultrafiltration membrane with the molecular weight cutoff of 8000 is determined to be selected as a material of the test according to actual application and the property of wastewater.
4 results
The gelatin production wastewater is treated by adopting the processes of electrolytic sedimentation pretreatment, inorganic ceramic membrane treatment system and ultrafiltration treatment, the wastewater in a gelatin production workshop is tested for 7 times respectively for 7 consecutive days, the water quality after treatment of each test section is detected, and the results of the test data are shown in the following table and the following graph.
Through analysis of experimental data for many times, the COD (chemical oxygen demand) removal efficiency of the wastewater can reach more than 85%, the protein removal rate can reach more than 85%, and the content and turbidity of organic matters in the wastewater can be effectively reduced, so that the wastewater can be purified, and the treated wastewater can be recycled and can be recycled in a washing workshop. The change curve analysis can obtain that the treatment method can concentrate the wastewater by nearly 3 times, greatly reduces the wastewater amount and is beneficial to the subsequent treatment of the residual wastewater.
TABLE 4-1 experiment 1 Water quality and treatment Effect of wastewater
TABLE 4-2 experiment 2 Water quality and treatment Effect of wastewater
TABLE 4-3 experiment 3 wastewater quality and treatment Effect
TABLE 4-4 experiment 4 quality of wastewater and treatment effect
TABLE 4-5 experiment 5 Water quality and treatment Effect of wastewater
TABLE 4-6 experiment 6 water quality and treatment effect of waste water
TABLE 4-7 EXPERIMENT 7 WASTE WATER QUALITY AND TREATMENT EFFECT
TABLE 4-8 statistics of the results
4.1 ceramic Membrane treatment orthogonal Experimental analysis
This experiment employed L 27 (3 9 ) Orthogonal experiments are carried out on three factors of pH, temperature and pressure in the culture conditions, a set of scheme is designed, and the optimal conditions of system operation under laboratory conditions are researched.
According to the single-factor experiment result, three levels are selected in a smaller range of the optimal condition, and the orthogonal experiment factor levels of the system operation are shown in tables 4-9; the results of the orthogonal tests and the range analysis thereof are shown in tables 4 to 10.
TABLE 4-9 ceramic membrane treatment orthogonal experiment factor horizon table
TABLE 4-10 analysis of ceramic membrane treatment in an orthogonal experiment
As can be seen from the extreme differences in the analytical values of the factors in tables 3-19, the factors have an effect on the flow rate of produced water of pH > pressure (MPa) > temperature. This indicates that the pH factor is dominant and has the greatest effect on the water production rate. Comparing the mean values of all the factors, the highest K values of the corresponding levels of the 3 factors are respectively A (2), B (2) and C (3), which shows that the optimal conditions for 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
This experiment employed L 27 (3 9 ) The table carries out orthogonal experiments on three factors of pH, temperature and pressure in the culture conditions, designs a set of scheme and researches the optimal conditions of system operation under laboratory conditions.
According to the single-factor experiment result, three levels are selected in a smaller range of the optimal condition, and the orthogonal experiment factor levels of the system operation are shown in tables 4-11; the results of the orthogonal experiments of ultrafiltration and their range analyses are shown in tables 4-12.
TABLE 4-11 ULTRAFILTRATION ORTHOGONAL EXPERIMENT FACTOR LEVEL METER
TABLE 4-12 Ultrafiltration Quadrature Experimental analysis
As can be seen from the extreme differences in the analytical values of the factors in tables 4 to 12, the influence of the factors on the flow rate of produced water is pressure > temperature (. Degree. C.) > pH. This indicates that the factor pressure is dominant and has the greatest effect on the water production flow. Comparing the mean values of all the factors, the highest K values of the corresponding levels of the 3 factors are respectively A (1), B (3) and C (3), which shows that the optimal conditions for 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 of different cleaning methods
The pretreatment and ultrafiltration systems are used for sewage treatment, and fouling of the membrane is inevitable. Membrane fouling is mainly manifested by: the water yield is reduced, the quality of the produced water is deteriorated, the transmembrane pressure difference is increased along with the increase of the water inlet pressure, certain filament breakage phenomena can occur in an ultrafiltration membrane system, and the greater the transmembrane pressure difference is, the more serious the filament breakage phenomena are.
The main reasons for 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 suspended matter and colloidal substances are excessive; the water inlet flow is larger and exceeds the water production capacity of the system; the water inlet pressure is larger; the chemical cleaning is not thorough, resulting in slow release of residual chemicals, causing irreversible damage to the system.
The waste water from gelatin production is mainly characterized by high content of suspended matters and colloidal substances and high content of organic matters. For the water quality characteristics of the wastewater, water washing, 5% sodium hydroxide washing, 5% hydrochloric acid washing and 5% protease washing are determined. The cleaning effect is shown in tables 4-13.
Tables 4-13 results of Membrane cleaning modes
According to the experimental result, the membrane is cleaned by 5% protease solution in the four cleaning modes with the best effect, but the cost of the protease is relatively high, and the 5% hydrochloric acid solution is recommended to be used for cleaning when the system runs, and the 5% protease solution is recommended to be used for cleaning when the system is seriously polluted and blocked.
The above description is only a part of specific embodiments of the present invention (since the formula of the present invention includes numerical ranges, the embodiments are not exhaustive, the protection scope of the present invention includes the numerical ranges and other technical point ranges), and the detailed contents or common knowledge known in the schemes are not described too much herein. It should be noted that the above-mentioned embodiments do not limit the present invention in any way, and it is obvious for those skilled in the art that all the technical solutions obtained by using the equivalent substitution or the equivalent change fall within the protection scope of the present invention. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The process for treating and recycling the wastewater in the gelatin production workshop is characterized by comprising the following steps of: the method comprises the following steps: collecting raw water; step two: filtering with filter cloth; step three: ceramic membrane treatment; step four: and (4) performing ultrafiltration treatment.
2. The process for treating and recycling wastewater of a gelatin production workshop according to claim 1, wherein the first step comprises: and raw water collection, including the raw water collection of each working condition of the production of the gelatin workshop, and the raw water enters a sedimentation tank for sedimentation pretreatment after passing through a grid respectively, wherein the adopted sedimentation method is an isoelectric point sedimentation method.
3. The gelatin production workshop wastewater treatment and recycling process as claimed in claim 2, wherein the isoelectric precipitation method comprises adjusting the pH to a collagen isoelectric point of 4.6-5.8; the used reagent is 1mol/L hydrochloric acid, and the hydraulic retention time in the sedimentation tank is 5-7 h.
4. The gelatin production workshop wastewater treatment and recycling process according to claim 1, wherein the step two is as follows: and filtering by using filter cloth, wherein the gelatin wastewater subjected to sedimentation pretreatment flows out of the sedimentation tank and then enters a water collecting tank with nylon filter cloth above.
5. The gelatin production workshop wastewater treatment and recycling process as claimed in claim 4, wherein the aperture of the filter cloth is 80-100 meshes, and the filter cloth can retain residual gelatin particles and collagen in the wastewater to realize the recovery of the gelatin particles and the collagen; the filter cloth is replaced every 4 to 8 hours.
6. The gelatin production plant wastewater treatment and reuse process according to claim 1, wherein the step three: and (3) ceramic membrane treatment, which comprises the steps of collecting the wastewater filtered by the filter cloth in a water collecting tank, and then feeding the wastewater into a ceramic membrane treatment system through a water inlet pipe.
7. The gelatin production workshop wastewater treatment and recycling process of claim 6, wherein the ceramic membrane is selected from membranes with a pore diameter of 50nm, and the optimal system operation conditions are as follows: the pH value is 8, the temperature is 35 ℃, and the pressure is 0.3MPa.
8. The gelatin production workshop wastewater treatment and recycling process according to claim 1, characterized by comprising the following steps: ultrafiltration treatment, comprising the use of an ultrafiltration membrane: performing ultrafiltration treatment on the polyether sulfone ultrafiltration membrane, wherein the molecular weight cutoff is 8000; the parameter conditions are as follows: the pH value is 8, the temperature is 30 ℃, and the pressure is 0.7MPa.
9. The gelatin production workshop wastewater treatment and recycling process as claimed in claim 1, wherein the process comprises a circulating step of 1) refluxing concentrated water obtained after the ceramic membrane treatment system to a sedimentation tank through a reflux pipeline for sedimentation pretreatment, and performing a new treatment cycle again; 2) And (3) returning the concentrated water passing through the ultrafiltration system through a return pipeline, and allowing the concentrated water to enter the sedimentation tank in the first step for recycling treatment again, wherein the water produced after ultrafiltration can be recycled in a gelatin production workshop through a pipeline.
10. The gelatin production workshop wastewater treatment and recycling process as claimed in claim 1, wherein the process comprises a cleaning step for periodically cleaning the ceramic membrane system and the ultrafiltration system; 1) When the system is in operation, cleaning by adopting a 5% hydrochloric acid solution; 2) And 5% protease solution is adopted for cleaning when dirt is blocked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211150931.0A CN115504598A (en) | 2022-09-21 | 2022-09-21 | Gelatin production workshop wastewater treatment and recycling process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211150931.0A CN115504598A (en) | 2022-09-21 | 2022-09-21 | Gelatin production workshop wastewater treatment and recycling process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115504598A true CN115504598A (en) | 2022-12-23 |
Family
ID=84504003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211150931.0A Pending CN115504598A (en) | 2022-09-21 | 2022-09-21 | Gelatin production workshop wastewater treatment and recycling process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115504598A (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004089833A2 (en) * | 2003-04-11 | 2004-10-21 | Staring Maskinfabrik A/S | Method and plant for treatment of organic waste material |
| CN1840540A (en) * | 2005-11-03 | 2006-10-04 | 武汉百信生物科技有限公司 | Method for reclaiming wastewater protein from animals and plants treatment |
| CN101041486A (en) * | 2007-04-24 | 2007-09-26 | 无锡迪威勒普科技有限公司 | Method for treatment and comprehensive utilization of silk production waste water |
| CN101215066A (en) * | 2007-12-30 | 2008-07-09 | 浙江大学 | Technique for treating chitin waste water |
| CN101234753A (en) * | 2007-02-02 | 2008-08-06 | 中国皮革和制鞋工业研究院 | Method and apparatus for recovering sulfide and protein from depilation waste liquor |
| CN101845078A (en) * | 2010-04-14 | 2010-09-29 | 兰州大学 | Method for extracting protein from wastewater of potato starch |
| CN101891280A (en) * | 2010-05-14 | 2010-11-24 | 江西金达莱环保研发中心有限公司 | Solid-liquid separation system for heavy metal wastewater treatment after chemical precipitation |
| JP2012110815A (en) * | 2010-11-24 | 2012-06-14 | Nippon Rensui Co Ltd | Method and apparatus for treating wastewater |
| CN102659233A (en) * | 2012-05-04 | 2012-09-12 | 泰祥集团技术开发有限公司 | Method for removing proteins in protein-enriched wastewater |
| CN102977181A (en) * | 2012-11-28 | 2013-03-20 | 天津大学 | Method for extracting protein in biological sludge |
| US20140374352A1 (en) * | 2013-06-21 | 2014-12-25 | Pall Corporation | System and method for treating fluid mixtures including aqueous and organic phases |
| AU2020101137A4 (en) * | 2020-06-25 | 2020-08-13 | Binzhou University | Wastewater treatment system by in site chemically-oxidized dynamic membrane |
| CN114804547A (en) * | 2022-06-02 | 2022-07-29 | 武汉华德环保工程技术有限公司 | High-concentration organic wastewater treatment system and method |
-
2022
- 2022-09-21 CN CN202211150931.0A patent/CN115504598A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004089833A2 (en) * | 2003-04-11 | 2004-10-21 | Staring Maskinfabrik A/S | Method and plant for treatment of organic waste material |
| CN1840540A (en) * | 2005-11-03 | 2006-10-04 | 武汉百信生物科技有限公司 | Method for reclaiming wastewater protein from animals and plants treatment |
| CN101234753A (en) * | 2007-02-02 | 2008-08-06 | 中国皮革和制鞋工业研究院 | Method and apparatus for recovering sulfide and protein from depilation waste liquor |
| CN101041486A (en) * | 2007-04-24 | 2007-09-26 | 无锡迪威勒普科技有限公司 | Method for treatment and comprehensive utilization of silk production waste water |
| CN101215066A (en) * | 2007-12-30 | 2008-07-09 | 浙江大学 | Technique for treating chitin waste water |
| CN101845078A (en) * | 2010-04-14 | 2010-09-29 | 兰州大学 | Method for extracting protein from wastewater of potato starch |
| CN101891280A (en) * | 2010-05-14 | 2010-11-24 | 江西金达莱环保研发中心有限公司 | Solid-liquid separation system for heavy metal wastewater treatment after chemical precipitation |
| JP2012110815A (en) * | 2010-11-24 | 2012-06-14 | Nippon Rensui Co Ltd | Method and apparatus for treating wastewater |
| CN102659233A (en) * | 2012-05-04 | 2012-09-12 | 泰祥集团技术开发有限公司 | Method for removing proteins in protein-enriched wastewater |
| CN102977181A (en) * | 2012-11-28 | 2013-03-20 | 天津大学 | Method for extracting protein in biological sludge |
| US20140374352A1 (en) * | 2013-06-21 | 2014-12-25 | Pall Corporation | System and method for treating fluid mixtures including aqueous and organic phases |
| AU2020101137A4 (en) * | 2020-06-25 | 2020-08-13 | Binzhou University | Wastewater treatment system by in site chemically-oxidized dynamic membrane |
| CN114804547A (en) * | 2022-06-02 | 2022-07-29 | 武汉华德环保工程技术有限公司 | High-concentration organic wastewater treatment system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101343132B (en) | Treatment method for wastewater of polyvinyl chloride (PVC) anticentripetal mother solution | |
| EP2024066B1 (en) | Method of improving performance of ultrafiltration or microfiltration membrane process in landfill leachate treatment | |
| Tewari et al. | Membrane bioreactor (MBR) for wastewater treatment: Filtration performance evaluation of low cost polymeric and ceramic membranes | |
| CN101391852B (en) | Processing method of polychloroethylene (PVC) centrifugal mother liquor waste water | |
| CN101935118A (en) | Process for purifying and recycling hot water by membrane method | |
| CN101088941A (en) | Technological process of treating papermaking effluent for reuse based on membrane integrating technique | |
| WO2013123134A1 (en) | Cooling tower blow-down, groundwater and wastewater re-use process and system | |
| CN107857438B (en) | Zero-emission process for wastewater treatment of chemical enterprises and parks | |
| CN208917033U (en) | Pre-treatment waste water treatment system | |
| CN104030517A (en) | Advanced treatment recovery technology of coking wastewater | |
| KR20190138975A (en) | Liquefied fertilizer purification apparatus using porous ceramic membrane | |
| CN106477762A (en) | Industrial concentrated water sofening treatment technique based on DF tubular membrane and system | |
| CN209685528U (en) | Waste water treatment system | |
| CN115504598A (en) | Gelatin production workshop wastewater treatment and recycling process | |
| CN203498181U (en) | System for recycling waste acid and waste alkali | |
| CN206872572U (en) | A kind of NF membrane advanced purification system for handling Desulphurization for Coal-fired Power Plant waste water | |
| CN213357244U (en) | Tobacco wastewater treatment system | |
| CN210796097U (en) | Container formula landfill leachate processing system | |
| CN218969053U (en) | Industrial wastewater zero release processing system | |
| CN215102732U (en) | Diamond sewage treatment filtering reactor | |
| CN220597233U (en) | Processing system for recycling organic phosphine in pharmaceutical industry | |
| CN217392064U (en) | Oily wastewater treatment device | |
| CN108773976A (en) | A kind of zero-emission multiple-stage watewater disposal system | |
| CN214528458U (en) | Saturated salt softening, precipitating and recycling system for industrial wastewater | |
| Lihua et al. | The substitution of sand filtration by immersed-UF for surface water treatment: pilot-scale studies |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |