CN111470703A - Method for treating salt water of preserved mustard tuber pickling head - Google Patents
Method for treating salt water of preserved mustard tuber pickling head Download PDFInfo
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- CN111470703A CN111470703A CN202010190730.8A CN202010190730A CN111470703A CN 111470703 A CN111470703 A CN 111470703A CN 202010190730 A CN202010190730 A CN 202010190730A CN 111470703 A CN111470703 A CN 111470703A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
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Abstract
A method for processing the salt water of the preserved szechuan pickle head comprises the following steps: (1) pre-treating, namely putting the salted brine of the preserved szechuan pickle into a coagulating sedimentation tank with a grid for sedimentation, and adding a medicament into the coagulating sedimentation tank to remove particles and sludge settled at the bottom; (2) treating the waste water after removing the sludge and the particulate matters by a centrifugal machine to form a mixed solution (mixed corrosion solution), putting the mixed solution into the centrifugal machine for centrifugal treatment, generating a filter cake after centrifugation, and taking out the filter cake to be removed; it can realize the recycling of water resource and useful components, and effectively and comprehensively utilize the membrane separation technology to ensure that the water quality reaches the drinking water standard.
Description
Technical Field
The invention relates to a method for treating brine of a preserved szechuan pickle preserving head, belonging to the technical field of treatment of food preserving wastewater.
Background
Hot pickled mustard tuber is the core industry in the three gorges area. In the process of producing hot pickled mustard tuber, a large amount of salt is used, and the salinity of the pickling waste water can reach 7 percent. The high salinity has obvious inhibiting effect on the growth of microorganisms, so that the traditional biological treatment method is difficult to treat, and the disordered discharge of the pickling wastewater can seriously threaten the surrounding water environment. At present, the research on the method for recycling the curing wastewater is less in China.
At present, the integrated treatment method of the waste water of the small-sized pickling plant is mainly to dilute the waste water by adding water, reduce the salt content to more than 1 percent, and complete the waste water purification by an internal reflux method after passing through a hydrolytic acidification-anaerobic aerobic alternative reactor; the purification treatment process of the salt-containing pickling wastewater in the existing food industry mainly comprises the following steps: (1) filtering and removing large-particle solid impurities in the salt-containing pickling wastewater, (2) heating to promote protein in the wastewater to generate denaturation flocculation, (3) centrifugally separating to remove flocculates, (4) adsorbing and separating to remove small-molecular impurities with activated carbon, (5) filtering to remove the activated carbon, realizing the purification treatment of the pickling wastewater, and the complexity (such as high organic matter concentration) of the wastewater and the characteristics of a membrane, wherein the membrane is always polluted by singly using a membrane separation technology, so that the membrane efficiency is reduced, and the cost is increased.
Disclosure of Invention
The invention provides a resource treatment method for treating pickled mustard tuber primary saline water, which can effectively remove high salt in pickling wastewater by using a membrane technology, solves the problem that the high salt wastewater is difficult to treat and reaches the standard, and realizes resource recycling of water and salt. The invention is realized by the following steps: a method for processing the salt water of the preserved szechuan pickle head comprises the following steps:
(1) pre-treating, namely putting the salted brine of the preserved szechuan pickle into a coagulating sedimentation tank with a grid for sedimentation, and adding a medicament into the coagulating sedimentation tank to remove particles and sludge settled at the bottom;
(2) treating the waste water after removing the sludge and the particulate matters by a centrifugal machine to form a mixed solution (mixed corrosion solution), putting the mixed solution into the centrifugal machine for centrifugal treatment, generating a filter cake after centrifugation, and taking out the filter cake to be removed;
(3) and (3) treating the PTFE membrane, namely obtaining salt-containing wastewater with less suspended matters and colloids after the steps (1), (2) and (3), and further filtering solid suspended matters and most bacteria by using an anti-pollution PTFE membrane system.
(4) Treating by an electrodialysis system; and (3) placing the wastewater after the membrane treatment into an electrodialysis system for electrodialysis, directly evaporating strong brine, and treating residual dilute brine by a biochemical system.
Preferably, the method comprises the following steps: removing particulate matter with the particle size of more than 2mm by using the grating in the step (1); adding PAC (polyaluminium chloride) into the coagulating sedimentation tank, uniformly stirring by a stirrer, and then adding PAM (anionic polyacrylamide), wherein the coagulating sedimentation time is 30min, and removing part of colloids and coarse impurities.
Preferably, the method comprises the following steps: in the step (2), the light phase, the heavy phase or the solid phase which has different densities and is not mutually soluble in the mixed solution (mixed etching solution) is utilized, and the centrifugal machine is a disk type centrifugal machine which can generate a strong centrifugal force field to ensure that solid particles in the liquid are rapidly settled and separated.
Preferably, the method comprises the following steps: the PTFE membrane system in the step (3) uses an imported anti-pollution PTFE membrane, and has a good removal effect on macromolecular organic matters, fine impurities, the total number of bacterial colonies and the total number of escherichia coli.
Preferably, the method comprises the following steps: and (4) enabling the residual dilute saline water with the concentration of 0.4-0.5% (mass percent) in the step (4) to enter a biochemical system to obtain concentrated saline water with the concentration of 15-18% (mass percent), and directly removing the concentrated saline water to an MVR (mechanical vapor recompression) evaporation system to obtain the crystallized salt.
Compared with the traditional wastewater treatment method, the membrane separation technology has good effect on wastewater treatment, can realize the recycling of water resources and useful components, and effectively and comprehensively utilizes the membrane separation technology to ensure that the water quality reaches the drinking water standard. The membrane separation technology, such as nanofiltration, ultrafiltration, reverse osmosis, electrodialysis and the like, is combined with other treatment technologies to further realize secondary treatment or advanced treatment of sewage.
Drawings
FIG. 1 is a process flow diagram of the present invention.
FIG. 2 is a schematic view of the operating principle of the electrodialyzer of the present invention.
Detailed Description
The invention will be described in detail below with reference to the following figures: as shown in figure 1, the method for treating the brine of the preserved szechuan pickle head comprises the following steps:
(1) pre-treating, namely putting the salted brine of the preserved szechuan pickle into a coagulating sedimentation tank with a grid for sedimentation, and adding a medicament into the coagulating sedimentation tank to remove particles and sludge settled at the bottom;
(2) treating the waste water after removing the sludge and the particulate matters by a centrifugal machine to form a mixed solution (mixed corrosion solution), putting the mixed solution into the centrifugal machine for centrifugal treatment, generating a filter cake after centrifugation, and taking out the filter cake to be removed;
(3) and (3) treating the PTFE membrane, namely obtaining salt-containing wastewater with less suspended matters and colloids after the steps (1), (2) and (3), and further filtering solid suspended matters and most bacteria by using an anti-pollution PTFE membrane system.
(4) Treating by an electrodialysis system; and (3) placing the wastewater after the membrane treatment into an electrodialysis system for electrodialysis, directly evaporating strong brine, and treating residual dilute brine by a biochemical system.
Removing particulate matter with the particle size of more than 2mm by using the grating in the step (1); adding PAC (polyaluminium chloride) into the coagulating sedimentation tank, uniformly stirring by a stirrer, and then adding PAM (anionic polyacrylamide), wherein the coagulating sedimentation time is 30min, and removing part of colloids and coarse impurities.
In the step (2), the light phase, the heavy phase or the solid phase which has different densities and is not mutually soluble in the mixed solution (mixed etching solution) is utilized, and the centrifugal machine is a disk type centrifugal machine which can generate a strong centrifugal force field to ensure that solid particles in the liquid are rapidly settled and separated.
The PTFE membrane system in the step (3) uses an imported anti-pollution PTFE membrane, and has a good removal effect on macromolecular organic matters, fine impurities, the total number of bacterial colonies and the total number of escherichia coli.
And (4) enabling the residual dilute saline water with the concentration of 0.4-0.5% (mass percent) in the step (4) to enter a biochemical system to obtain concentrated saline water with the concentration of 15-18% (mass percent), and directly removing the concentrated saline water to an MVR (mechanical vapor recompression) evaporation system to obtain the crystallized salt.
The invention provides a resource treatment method for treating pickled mustard tuber primary saline water, which can effectively remove high salt in pickling wastewater by using a membrane technology, solves the problem that the high salt wastewater is difficult to treat and reaches the standard, and realizes resource recycling of water and salt.
A process for treating the salt water of the preserved szechuan pickle comprises the following steps:
1. step of pretreatment
The first salt water contains large particle suspended matters such as shredded hot pickled mustard tuber, silt and colloid. The majority of the suspended particles are effectively removed by the grid and sediment prior to entering the system so as not to clog water pumps, PTFE membrane wires, or other equipment.
The coagulating sedimentation tank is one of sedimentation tanks in waste water treatment. The coagulation process is the most basic and very important treatment process in the treatment of industrial water and domestic sewage, and by adding some medicaments (generally called coagulant and coagulant aid) into water, particles which are difficult to precipitate in the water can be polymerized with each other to form colloid, and then are combined with impurities in the water body to form larger floccules. The flocculating constituent has strong adsorption capacity, can adsorb suspended matters, and can adsorb partial bacteria and soluble substances. The flocs sink down by increasing their volume through adsorption.
Through the beaker experiment, the following conclusions were obtained: when the same amount of coagulant is added, the more precipitates are separated out from the head brine along with the increase of the pH value. However, in actual operation, it is found that: after the alkali is added, a large amount of foam is generated in the operation process of the whole system, so that the customized membrane safety filter element and the customized membrane body in a subsequent system are polluted and blocked; excessive poly (ferric chloride) (PFC) can also have some effect on subsequent system membranes.
More preferably, the system finally selects and adds 1000ppm of polyaluminium chloride (PAC), and adds 4ppm of PAM (anionic) after the mixture is stirred uniformly by a stirrer. After 30min of coagulating sedimentation, the supernatant enters the next unit, and the bottom sludge is discharged.
Procedure of disk centrifuge
The electrodialysis is used for separating and layering or settling solid particles in liquid by using the principle that light phase, heavy phase or solid phase with different densities and immiscible with each other in a mixed solution (turbid solution) obtains different settling velocities in a centrifugal force field.
Pumping the supernatant after coagulating sedimentation into a rotary drum of a disc centrifuge from a feed pipe by using a water pump, and under the action of a strong centrifugal force field, allowing the supernatant to pass through a separation interval of a group of disc bundles, taking a disc neutral hole as an interface, allowing liquid (heavy phase) with larger specific gravity to move outwards from the disc neutral hole along the disc wall and flow to an upper centrifugal pump, and accumulating heavy slag in a slag settling area; the light phase moves upwards along the disc wall and converges to flow to the lower centripetal pump, and the light phase and the heavy phase are respectively output by the upper centripetal pump and the lower centripetal pump.
And the separated clear liquid enters the next unit, and the sludge is discharged from a residue discharge port of the disc centrifuge for subsequent treatment.
Step of film formation
The PTFE membrane is a microporous membrane produced by polytetrafluoroethylene dispersion resin through special processes of premixing, extruding, calendaring, biaxial stretching and the like, has a fibrillar microporous structure, has the porosity of more than 85 percent, has 14 hundred million micropores per square centimeter, and has the pore diameter range of 0.02-15 mu m. The system employs an inlet anti-contaminant PTFE device for trapping colloidal-sized particles in water, while water and low molecular weight solutes are allowed to permeate the PTFE membrane.
The filtering principle is as follows: the PTFE membrane is used as a filter medium, and when raw water flows through the membrane surface under a certain pressure, a plurality of fine micropores densely distributed on the membrane surface only allow water and small molecular substances to pass through to form permeate, and substances with the volume larger than the micropore diameter of the membrane surface in the raw water are intercepted on the liquid inlet side of the membrane to form concentrated liquid, so that the purposes of purifying, separating and concentrating the raw water are achieved. And determining the concentration of sodium hydroxide according to the pressure change and the pollution condition to carry out chemical cleaning on the membrane. Preferably, when the difference between the water pressure in the inlet and the water pressure in the outlet is more than 0.08MPa, the chemical cleaning is carried out by using 3 to 10 percent sodium hydroxide solution.
And the water produced by the PTFE membrane device enters the next unit.
Step of customizing the film
The system adopts anion and cation membranes, and is matched with an electrodialyzer device to form integrated customized equipment.
The ion exchange membrane is a membrane made of a polymer material and having selective permeability to ions. Mainly comprises a cation exchange membrane (CM, called positive membrane for short) and an anion exchange membrane (AM, called negative membrane for short). The positive membrane can selectively permeate cations because the membrane body fixed group has negative charge ions; the negative membrane can selectively transmit anions because the membrane body fixing group has positive charge ions. The ability of the positive membrane to transmit cations and the negative membrane to transmit anions is referred to as the membrane's permselectivity. The most basic working unit of an electrodialyser process is called a membrane pair. One membrane pair constitutes one desalting compartment and one concentrating compartment. One practical electrodialyzer consists of hundreds of membrane pairs.
The main parts of the electrodialyzer are anion-cation exchange membrane, separator and electrode. The compartment formed by the partition is a passage through which the liquid flows. The compartment through which the fresh water passes is a desalting chamber, and the compartment through which the concentrated water passes is a concentrating chamber. If anion and cation exchange membranes and dense and fresh water separators are alternately arranged and repeatedly superposed, and a pair of end electrodes is added, a practical electrodialyzer is formed.
The salt water for pickling the preserved szechuan pickle contains a large amount of NaCl. Under the condition of electrifying, alternating current is converted into direct current through a rectifier, the direct current is introduced into an electrodialyzer from an electrode, and the conversion from electronic conduction to ionic conduction is completed through electrochemical reaction on an electrode solution interface.Na in fresh water compartment+Migration towards the cathode, Cl-Migration to the anode, Na+With Cl-Migrate through the CM and AM, respectively, to adjacent compartments. So that the concentration of the NaCl solution in the fresh water compartment is continuously reduced; the concentration of the NaCl solution in the concentrate compartment increases accordingly. The desalted solution can be obtained in the fresh water tank, the concentrated solution with high NaCl concentration is obtained in the concentrated water tank, and the concentrated solution is discharged into the concentrated solution tank for subsequent treatment.
The invention has the beneficial effects that:
1. provides a treatment method for treating high-salinity pickling wastewater, can be widely applied to the food pickling industry, and has certain universality.
2. The fresh water can be directly discharged or used for the second time, the concentrated water can be used for preparing the salt, the salt and the moisture can be fully recycled, and the production cost is reduced.
3. Tiny suspended matters, colloid, bacteria, escherichia coli and the like in the pickled mustard tuber head brine are removed by adding drugs and separating the agent by a disc centrifuge, so that the pollution and blockage frequency of subsequent membrane treatment is greatly reduced, the cleaning frequency is reduced, and the treatment efficiency is improved.
4. The whole system has no phase change, low energy consumption, no new impurities, high separation efficiency and economical efficiency.
5. Unlike biological treatment, the whole system is less affected by the surrounding environment, has stability, and is applicable to all seasons.
Claims (5)
1. The method for treating the salt water of the preserved szechuan pickle head is characterized by comprising the following steps of:
(1) pre-treating, namely putting the salted brine of the preserved szechuan pickle into a coagulating sedimentation tank with a grid for sedimentation, and adding a medicament into the coagulating sedimentation tank to remove particles and sludge settled at the bottom;
(2) treating the waste water after removing the sludge and the particulate matters by a centrifugal machine to form a mixed solution (mixed corrosion solution), putting the mixed solution into the centrifugal machine for centrifugal treatment, generating a filter cake after centrifugation, and taking out the filter cake to be removed;
(3) treating a PTFE membrane, namely obtaining saline wastewater with less suspended matters and colloids after the steps (1), (2) and (3), and further filtering solid suspended matters and most bacteria by an anti-pollution PTFE membrane system;
(4) treating by an electrodialysis system; and (3) placing the wastewater after the membrane treatment into an electrodialysis system for electrodialysis, directly evaporating strong brine, and treating residual dilute brine by a biochemical system.
2. The method for treating the brine for the preserved szechuan pickle head according to claim 1, wherein the step (1) is a step of removing particulate matters with a particle size of more than 2mm by using a grating; adding PAC (polyaluminium chloride) into the coagulating sedimentation tank, uniformly stirring by a stirrer, and then adding PAM (anionic polyacrylamide), wherein the coagulating sedimentation time is 30min, and removing part of colloids and coarse impurities.
3. The method for treating the brine for pickling the tuber mustard of claim 1, wherein the step (2) utilizes the light phase, the heavy phase or the solid phase which have different densities and are not mutually soluble in the mixed solution (the mixed etching solution), and the centrifuge is a disk centrifuge which can generate a strong centrifugal field to rapidly settle and separate the solid particles in the liquid.
4. The method for treating the brine for pickling heads of preserved szechuan pickle as claimed in claim 1, wherein the PTFE membrane system in the step (3) is an imported anti-pollution PTFE membrane which has good removal effect on macromolecular organic matters, fine impurities, the total number of bacterial colonies and the total number of Escherichia coli.
5. The method for treating the brine for preserving mustard tuber according to claim 1, wherein the residual dilute brine in the step (4) has a concentration of 0.4-0.5% (mass percent) and enters a biochemical system to obtain a concentrated brine with a concentration of 15-18% (mass percent), and the concentrated brine is directly sent to an MVR evaporation system to obtain the salt crystal.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112537883A (en) * | 2020-12-04 | 2021-03-23 | 重庆市生态环境科学研究院 | Coupled high-salinity wastewater recycling treatment process for pickled mustard tuber |
| CN112624519A (en) * | 2020-12-29 | 2021-04-09 | 重庆理工大学 | Treatment method of preserved szechuan pickle wastewater |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104150721A (en) * | 2014-08-29 | 2014-11-19 | 北京赛科康仑环保科技有限公司 | Resourceful treatment method for food processing wastewater |
| CN107183612A (en) * | 2017-04-28 | 2017-09-22 | 浙江沐源环境工程有限公司 | A kind of preparation method of hot pickled mustard tube |
| CN110550818A (en) * | 2019-08-20 | 2019-12-10 | 生态环境部华南环境科学研究所 | Efficient biogas slurry desalting treatment process after fermentation of dairy cow breeding wastewater |
-
2020
- 2020-03-18 CN CN202010190730.8A patent/CN111470703A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104150721A (en) * | 2014-08-29 | 2014-11-19 | 北京赛科康仑环保科技有限公司 | Resourceful treatment method for food processing wastewater |
| CN107183612A (en) * | 2017-04-28 | 2017-09-22 | 浙江沐源环境工程有限公司 | A kind of preparation method of hot pickled mustard tube |
| CN110550818A (en) * | 2019-08-20 | 2019-12-10 | 生态环境部华南环境科学研究所 | Efficient biogas slurry desalting treatment process after fermentation of dairy cow breeding wastewater |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112537883A (en) * | 2020-12-04 | 2021-03-23 | 重庆市生态环境科学研究院 | Coupled high-salinity wastewater recycling treatment process for pickled mustard tuber |
| CN112624519A (en) * | 2020-12-29 | 2021-04-09 | 重庆理工大学 | Treatment method of preserved szechuan pickle wastewater |
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