CN113443766A - Gelatin wastewater treatment method and treatment system - Google Patents

Gelatin wastewater treatment method and treatment system Download PDF

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Publication number
CN113443766A
CN113443766A CN202110656496.8A CN202110656496A CN113443766A CN 113443766 A CN113443766 A CN 113443766A CN 202110656496 A CN202110656496 A CN 202110656496A CN 113443766 A CN113443766 A CN 113443766A
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treatment
reverse osmosis
effect evaporation
nanofiltration
evaporation
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陈韶范
李健
刘宝
秦妮
陈冠羲
任向东
杨帆
黄超
杨晓
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Inner Mongolia Dongbao Datian Biotechnology Co.,Ltd.
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Shanghai Lanbin Petrochemical Equipment Co Ltd
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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
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/20—Halides
    • C01F11/24—Chlorides
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/20—Halides
    • C01F11/24—Chlorides
    • C01F11/30—Concentrating; Dehydrating; Preventing the adsorption of moisture or caking
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F7/00—Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses
    • C05F7/005—Waste water from industrial processing material neither of agricultural nor of animal origin
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/18—Materials not provided for elsewhere for application to surfaces to minimize adherence of ice, mist or water thereto; Thawing or antifreeze materials for application to surfaces
    • C09K3/185—Thawing materials
    • 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
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • 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
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
    • 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
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by 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
    • C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
    • 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
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281—Installations for water purification using chemical agents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses

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  • Chemical & Material Sciences (AREA)
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  • Hydrology & Water Resources (AREA)
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  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The application discloses a gelatin wastewater treatment method and a treatment system, wherein the method comprises the following steps: introducing the gelatin wastewater into a pretreatment area, and removing macromolecular organic matters by flocculation precipitation treatment, ultrafiltration treatment, nanofiltration treatment and reverse osmosis treatment in sequence; the concentrated water formed after the reverse osmosis treatment is subjected to MVR evaporation treatment, triple effect evaporation treatment, single effect evaporation treatment and cooling slicing treatment in sequence to prepare calcium chloride dihydrate; part or all of clear water generated in the reverse osmosis treatment, the MVR evaporation treatment, the three-effect evaporation treatment and the single-effect evaporation treatment is returned to the pretreatment area for recycling; and the slurry or concentrated water generated in the flocculation precipitation treatment, the ultrafiltration treatment and the nanofiltration treatment is recycled as organic fertilizer. The method effectively realizes zero discharge and recycling of the gelatin wastewater and realizes win-win of environmental protection benefit and economic benefit for treating the wastewater containing salt and organic matters.

Description

Gelatin wastewater treatment method and treatment system
Technical Field
The invention relates to the technical field of treatment of wastewater containing salt and organic matters, in particular to a treatment method and a treatment system for gelatin wastewater.
Background
Gelatin is a partially hydrolyzed product of collagen, belongs to the category of protein macromolecules, has similar characteristics to protein macromolecules, and has wide application in the fields of food, medicines and other industries. The raw materials for producing the gelatin mainly comprise skins and bones of animals, leather-making waste materials and the like, the gelatin is obtained by moderate hydrolysis and thermal denaturation of collagen, common gelatin on the market is mostly prepared by taking cow cattle bones or pig skins as raw materials, and at present, the production method of the gelatin mainly comprises an alkaline method, an acid method, an enzymatic method and the like.
Gelatin produces a lot of waste water in the production process, and the gelatin waste water is waste water containing a large amount of high salt and high Chemical Oxygen Demand (COD). After most of phosphate is recovered by the traditional process, a large amount of waste water containing calcium chloride, protein and amino acid is still generated, the waste water with high salt and high COD cannot be biochemically treated, the environment is influenced by direct discharge, more and more waste water can be accumulated for recycling, the use is influenced, and the normal production activity of enterprises is influenced at present.
Disclosure of Invention
The invention aims to provide a gelatin wastewater treatment method and a treatment system, which aim to solve the problems in the technical background, and the treated product can be recycled, so that the recycling and zero discharge of wastewater are realized.
In order to achieve the purpose, the invention adopts the following technical scheme:
the first aspect of the present application provides a method for treating gelatin wastewater, comprising:
introducing the gelatin wastewater into a pretreatment area, and removing macromolecular organic matters by flocculation precipitation treatment, ultrafiltration treatment, nanofiltration treatment and reverse osmosis treatment in sequence;
carrying out MVR evaporation treatment, triple-effect evaporation treatment and single-effect evaporation treatment on the concentrated water formed after the reverse osmosis treatment in sequence to obtain concentrated solution, cooling and slicing the concentrated solution, and drying the concentrated solution by hot air to prepare calcium chloride dihydrate or anhydrous calcium chloride;
part or all of clear water generated in the reverse osmosis treatment, the MVR evaporation treatment, the three-effect evaporation treatment and the single-effect evaporation treatment is returned to the pretreatment area for recycling; and concentrated water generated in the flocculation precipitation treatment, the ultrafiltration treatment and the nanofiltration treatment is used as organic fertilizer or used for preparing organic fertilizer.
In a preferred embodiment, the macromolecular organic substance is any one or more of a peptide, a protein or an amino acid.
Preferably, the settling time of the flocculation precipitation treatment is 1-4 h.
Preferably, the flocculation precipitation treatment comprises:
putting a flocculating agent to a specified dosing point;
sending supernatant liquor obtained after precipitation to ultrafiltration treatment;
and directly discharging the precipitated slurry or automatically flowing to a filter press to be filter-pressed into a filter cake and then discharging, wherein the filtrate generated in the filter pressing process of the filter press returns to the pretreatment area to be recycled.
More preferably, the flocculant comprises one or more of polyaluminium chloride (PAC), polyferric sulfate (PFS), Polyacrylamide (PAM), barium chloride.
More preferably, the mass ratio of the flocculating agent to the gelatin wastewater is 1: 100-1: 10000.
More preferably, the mud or filter cake after flocculation precipitation treatment separation is used as organic fertilizer production raw material.
Preferably, an ultrafiltration membrane with the aperture of 1-200 nm is selected in the ultrafiltration treatment.
Preferably, the pressure of the ultrafiltration treatment is 0.1-1 MPa.
Preferably, ultrafiltration product water and concentrated slurry are obtained after the ultrafiltration treatment, the ultrafiltration product water is sent to nanofiltration treatment, and the concentrated slurry is directly discharged or automatically flows to a filter press to be filter-pressed into a filter cake.
More preferably, the concentrated slurry or filter cake after ultrafiltration treatment separation is used as an organic fertilizer production raw material.
Preferably, a nanofiltration membrane with the aperture of 1-5 nm is selected in the nanofiltration treatment.
Preferably, the pH value of the inlet water subjected to nanofiltration treatment is 6.5-11.0.
Preferably, the pressure of nanofiltration treatment is 1-4 MPa, and the membrane flux is 10-35L/m2·h。
Preferably, nanofiltration water and nanofiltration concentrated water are obtained after the nanofiltration treatment, the nanofiltration water is sent to reverse osmosis treatment, and the nanofiltration concentrated water is used as an organic fertilizer production raw material.
Preferably, a reverse osmosis membrane with the aperture of 0.5-10 nm is selected in the reverse osmosis treatment.
Preferably, the pH value of the inlet water of the reverse osmosis treatment is 5.0-10.0.
Preferably, the pressure of the reverse osmosis treatment is 4-8 MPa, and the membrane flux is 30-60L/m2·h。
Preferably, the conditions of the MVR evaporation treatment include: the temperature is 0-60 ℃, the pressure is 0.1-0.3 MPa, and the solid content is 3-12%.
Preferably, the conditions of the triple effect evaporation process include: the temperature is 60-120 ℃, the pressure is 0.1-0.4 MPa, and the solid content is 20-30%.
Preferably, the conditions of the single-effect evaporation treatment include: the temperature is 80-170 ℃, the pressure is 0.1-0.4 MPa, and the solid content is 60-70%.
Preferably, the cooling slicing process includes: and (3) carrying out cooling crystallization on the concentrated solution obtained after single-effect evaporation treatment through indirect heat exchange of cooling water, and slicing to obtain calcium chloride dihydrate crystals.
Preferably, the product after the cooling and slicing treatment is dried by a hot air drying system to prepare calcium chloride dihydrate and anhydrous calcium chloride.
More preferably, the hot air temperature of the hot air drying system is 200-300 ℃, the heat source adopts steam or natural gas, and the tail gas is directly introduced into the MVR evaporation storage tank at the front section to recover heat.
Preferably, the calcium chloride dihydrate or the anhydrous calcium chloride prepared after the cooling slicing treatment is sold as a snow melting agent or other calcium chloride products.
More preferably, after the cooling slice treatment is performed to prepare calcium chloride dihydrate, the wastewater treatment method further comprises the following steps: and (3) performing dry granulation on the prepared calcium chloride dihydrate or anhydrous calcium chloride, wherein the granulation diameter range is 1-5 mm, and then packaging and stacking the granules to prepare the snow-melting agent for sale.
Preferably, the wastewater treatment method further comprises: and lime milk is added into part or all of the clear water generated in the reverse osmosis treatment, the MVR evaporation treatment, the three-effect evaporation treatment and the single-effect evaporation treatment, and the filtered supernatant is returned to the pretreatment area for recycling after standing and precipitating.
More preferably, the lime milk is directly prepared from saturated lime milk or industrial quick lime.
In a second aspect, the present application provides a gelatin wastewater treatment system comprising: a pretreatment section, a membrane treatment section and an evaporation concentration crystallization section;
the pretreatment section comprises: the device comprises a dosing tank and a flocculation precipitation tank, wherein the upstream of the dosing tank is communicated with a discharge port of gelatin wastewater, the downstream of the dosing tank is communicated with the flocculation precipitation tank, and the flocculation precipitation tank comprises a discharge port of precipitated slurry and a clear liquid outlet;
the membrane treatment stage comprises: the device comprises an ultrafiltration device, a nanofiltration device and a reverse osmosis device which are sequentially communicated, wherein the upstream of the ultrafiltration device is communicated with a clear liquid water outlet of a flocculation precipitation tank, the ultrafiltration device also comprises a discharge port for concentrating slurry, the nanofiltration device also comprises a concentrated water outlet, and the reverse osmosis device comprises a concentrated water outlet and a clear water outlet;
the evaporation concentration crystallization section comprises: the MVR evaporation device, the triple-effect evaporation device, the single-effect evaporation device and the cooling slicing device are sequentially communicated, and the upstream of the MVR evaporation device is communicated with a concentrated water outlet of the reverse osmosis device;
wherein, the clear water outlet of the reverse osmosis device, the MVR evaporation plant, the triple-effect evaporation plant and the single-effect evaporation plant are also respectively communicated with the medicine feeding groove.
Preferably, the flocculating agent added into the flocculation precipitation tank comprises one or more of polyaluminium chloride (PAC), polyferric sulfate (PFS), Polyacrylamide (PAM) and barium chloride.
Preferably, the ultrafiltration device adopts an ultrafiltration membrane with the aperture of 1-200 nm.
Preferably, the pressure of the ultrafiltration device is 0.1-1 MPa.
Preferably, the nanofiltration device adopts a nanofiltration membrane with the aperture of 1-5 nm.
Preferably, the pressure of the nanofiltration device is 1-4 MPa, and the membrane flux is 10-35L/m2·h。
Preferably, the reverse osmosis device is a reverse osmosis membrane with the aperture of 0.5-10 nm.
Preferably, the pressure of the reverse osmosis device is 4-8 MPa, and the membrane flux is 30-60L/m2·h。
Preferably, the processing conditions of the MVR evaporation device include: the temperature is 0-60 ℃, the pressure is 0.1-0.3 MPa, and the solid content is 3-12%.
Preferably, the processing conditions of the triple effect evaporation device comprise: the temperature is 60-120 ℃, the pressure is 0.1-0.5 MPa, and the solid content is 20-30%.
Preferably, the processing conditions of the single-effect evaporation device include: the temperature is 80-170 ℃, the pressure is 0.1-0.8 MPa, and the solid content is 60-70%.
Preferably, the gelatin wastewater treatment system further comprises: and the granulating device is connected with the cooling slicing device and is used for carrying out dry granulation on the calcium chloride dihydrate output by the cooling slicing device, and the granulation diameter range is 1-5 mm.
More preferably, the gelatin wastewater treatment system further comprises: and the packaging and stacking device is connected with the granulating device and is used for packaging and stacking the solid output by the granulating device to prepare a snow melting agent or other calcium chloride products for sale.
Preferably, the gelatin wastewater treatment system further comprises: and the inlet of the lime milk generator is respectively connected with the clean water outlet of the reverse osmosis device, the MVR evaporation device, the three-effect evaporation device and the single-effect evaporation device and is communicated, and the outlet of the lime milk generator is communicated with the chemical feeding groove.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the application will contain gelatin waste water of high COD, high salt and get rid of macromolecular organic matters such as most protein, amino acid through flocculation and precipitation, ultrafiltration, receive and strain, reverse osmosis treatment, retrieve partly clear water through reverse osmosis, reverse osmosis dense water passes through MVR evaporation, triple effect evaporation, single effect evaporation, cooling section and prepares calcium chloride dihydrate. Wherein clear water recovered by nanofiltration and reverse osmosis is used as process water for producing gelatin, nanofiltration concentrated water, ultrafiltration concentrated water, flocculation precipitation concentrated slurry or filter cakes are used as raw materials for producing organic fertilizer, and calcium chloride dihydrate or anhydrous calcium chloride prepared by slicing is used as a snow melting agent or other calcium chloride products for sale. The method effectively realizes zero discharge and recycling of the gelatin wastewater and realizes win-win of environmental protection benefit and economic benefit for treating the wastewater containing salt and organic matters.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 is a process flow diagram of a gelatin wastewater treatment process of the present application.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Please refer to fig. 1. It should be noted that the drawings provided in the present embodiment are only for schematically illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation.
Example (b):
the combined process flow of the attached figure 1 of the application is adopted to treat certain gelatin wastewater, wherein the gelatin wastewater is obtained by the preparation method of acid gelatin.
The quality of the wastewater is as follows: pH 5, COD 2000mg/L, Ca2+Is 400mol/L, Cl-Is 300mol/L, PO4 3+200mol/L, total salt content of 15000mg/L and wastewater treatment water amount of 200m3/h。
In this embodiment, a wastewater treatment system is used which comprises: a pretreatment section, a membrane treatment section and an evaporation concentration crystallization section.
Wherein the pre-processing section comprises: the device comprises a dosing tank and a flocculation precipitation tank, wherein the upstream of the dosing tank is communicated with a discharge port of gelatin wastewater, the downstream of the dosing tank is communicated with the flocculation precipitation tank, and the flocculation precipitation tank comprises a discharge port of precipitated slurry and a clear liquid outlet. In the drug adding tank, barium chloride is required to be added besides the gelatin wastewater. The flocculant is prepared in a dosing tank, and then is pumped into a flocculation precipitation tank in a liquid state by a dosing pump after preparation.
Wherein the membrane treatment stage comprises: the device comprises an ultrafiltration device, a nanofiltration device and a reverse osmosis device which are sequentially communicated, wherein the upstream of the ultrafiltration device is communicated with a clarified liquid outlet of a flocculation precipitation tank, the ultrafiltration device further comprises a discharge outlet of concentrated slurry, the nanofiltration device further comprises a concentrated water outlet, and the reverse osmosis device comprises a concentrated water outlet and a clear water outlet.
Wherein, the evaporation concentration crystallization section comprises: MVR evaporation plant, triple effect evaporation plant, single effect evaporation plant and the cooling section device that communicate in proper order, MVR evaporation plant's upper reaches intercommunication reverse osmosis unit's dense water delivery port.
In the above wastewater treatment system, the clean water outlet of the reverse osmosis device, the MVR evaporation device, the triple-effect evaporation device and the single-effect evaporation device are also respectively communicated with the dosing tank.
In a preferred embodiment, the gelatin wastewater treatment system further comprises: a granulating device and a packaging and stacking device. The granulation device is connected with the cooling slicing device and is used for carrying out dry granulation on calcium chloride dihydrate output by the cooling slicing device, and the granulation diameter range is 1-5 mm; and the packaging and stacking device is connected with the granulating device and is used for packaging and stacking the solid output by the granulating device to prepare the sold snow-melting agent.
In a preferred embodiment, the gelatin wastewater treatment system further comprises: and the inlet of the lime milk generator is respectively connected with the clean water outlet of the reverse osmosis device, the MVR evaporation device, the three-effect evaporation device and the single-effect evaporation device and is communicated, and the outlet of the lime milk generator is communicated with the chemical feeding groove.
The treatment system is used for treating the wastewater, and the treatment steps are as follows:
1) introducing the gelatin wastewater into a dosing tank; putting a flocculating agent, wherein the mass ratio of the flocculating agent to the gelatin wastewater is 1: 100-1: 10000, and the flocculating agent comprises polyaluminium chloride (PAC), polyferric sulfate (PFS), Polyacrylamide (PAM) and barium chloride; and precipitating for 1-4 hours, directly discharging the slurry obtained after precipitation, or automatically flowing to a filter press to be filter-pressed into a filter cake and then discharging the filter cake to be used as a raw material for producing an organic fertilizer (liquid fertilizer), and sending supernatant clarified liquid obtained after precipitation to a next-stage ultrafiltration device for ultrafiltration treatment.
2) And an ultrafiltration membrane with the aperture of 1-200 nm is selected in the ultrafiltration treatment, and the pressure of the ultrafiltration treatment is 0.1-1 MPa. After the clarified liquid entering the ultrafiltration device is subjected to ultrafiltration treatment, the generated concentrated slurry is directly discharged, or automatically flows to a filter press to be filter-pressed into a filter cake to be discharged, the filter cake is used as a raw material for producing organic fertilizer (liquid fertilizer), and the generated ultrafiltration water is sent to a nanofiltration device to be subjected to nanofiltration treatment.
3) The pH value of the inlet water subjected to nanofiltration treatment is 5.0-10.0, a nanofiltration membrane with the aperture of 1-5 nm is selected in the nanofiltration treatment, the pressure of the nanofiltration treatment is 1-4 MPa, and the membrane flux is 10-35L/m2H. And (3) obtaining nanofiltration produced water and nanofiltration concentrated water after the nanofiltration device is treated, wherein the nanofiltration concentrated water is used as an organic fertilizer (liquid fertilizer) production raw material, and the nanofiltration produced water is sent to a reverse osmosis device for reverse osmosis treatment.
4) The pH value of the inlet water of the reverse osmosis treatment is 5.0-10.0, the reverse osmosis membrane with the aperture of 0.5-10 nm is selected in the reverse osmosis treatment, the pressure of the reverse osmosis treatment is 4-8 MPa, and the membrane flux is 30-60L/m2·h。
After the flocculation precipitation treatment, the ultrafiltration treatment, the nanofiltration treatment and the reverse osmosis treatment, most of macromolecular organic matters such as protein, amino acid and the like in the wastewater are removed. At this time, the removal rate of protein was 98%, the removal rate of amino acid was 95%, the removal rate of sulfate was 99%, and the removal rate of phosphate was 97%.
5) The concentrated water formed after the reverse osmosis treatment is subjected to MVR evaporation treatment, triple effect evaporation treatment and single effect evaporation treatment in sequence.
Wherein the MVR evaporation treatment conditions comprise: the temperature is 0-60 ℃, the pressure is 0.1-0.3 MPa, and the solid content is 3-12%; the conditions of the triple effect evaporation treatment include: the temperature is 60-120 ℃, the pressure is 0.1-0.5 MPa, and the solid content is 20-30%; the conditions of the single-effect evaporation treatment include: the temperature is 80-150 ℃, the pressure is 0.1-0.8 MPa, and the solid content is 60-70%.
6) Cooling, crystallizing and slicing the concentrated solution obtained after single-effect evaporation treatment through indirect heat exchange of cooling water to obtain calcium chloride dihydrate crystals; and (3) carrying out dry granulation on the prepared calcium chloride dihydrate, wherein the granulation diameter range is 1-5 mm, and then packaging and stacking to prepare the snow-melting agent for sale.
7) And recovering part of clear water generated by reverse osmosis treatment, and recovering part of clear water generated in MVR evaporation treatment, triple-effect evaporation treatment and single-effect evaporation treatment. At the moment, the removal rate of protein in the recovered clear water is 99.8 percent, the removal rate of amino acid is 98 percent, the content of TDS is 500mg/L, COD is less than 200mg/L, and the standard of recycling the process water can be met.
8) And adding lime milk into part of the clear water recovered in the reverse osmosis treatment, the MVR evaporation treatment, the three-effect evaporation treatment and the single-effect evaporation treatment, wherein the lime milk is prepared by directly adopting saturated lime milk or adopting industrial quick lime. The lime milk enables phosphate, sulfate, magnesium salt and the lime milk in the recovered clear water to be chemically precipitated, and the hardness of the water is effectively reduced. And returning the filtered supernatant to the medicine adding tank for recycling after standing and precipitating.
To sum up, this application will contain gelatin waste water of high COD, high salt and get rid of macromolecular organic matters such as most protein, amino acid through flocculation and precipitation, ultrafiltration, receive and strain, reverse osmosis treatment, retrieve partly clear water through reverse osmosis, reverse osmosis dense water passes through MVR evaporation, triple effect evaporation, single effect evaporation, cooling section, hot air drying prepares calcium chloride dihydrate or anhydrous calcium chloride. Wherein clear water recovered by nanofiltration and reverse osmosis is used as process water for producing gelatin, nanofiltration concentrated water, ultrafiltration concentrated water, flocculation precipitation concentrated slurry or filter cakes are used as raw materials for producing organic fertilizer, and calcium chloride dihydrate or anhydrous calcium chloride prepared by slicing is used as a snow melting agent or other calcium chloride products for sale. The method effectively realizes zero discharge and recycling of the gelatin wastewater and realizes win-win of environmental protection benefit and economic benefit for treating the wastewater containing salt and organic matters.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.

Claims (10)

1. A gelatin wastewater treatment method is characterized by comprising the following steps:
introducing the gelatin wastewater into a pretreatment area, and removing macromolecular organic matters by flocculation precipitation treatment, ultrafiltration treatment, nanofiltration treatment and reverse osmosis treatment in sequence;
carrying out MVR evaporation treatment, triple-effect evaporation treatment and single-effect evaporation treatment on the concentrated water formed after the reverse osmosis treatment in sequence to obtain concentrated solution, cooling and slicing the concentrated solution, and drying the concentrated solution by hot air to prepare calcium chloride dihydrate or anhydrous calcium chloride;
part or all of clear water generated in the reverse osmosis treatment, the MVR evaporation treatment, the three-effect evaporation treatment and the single-effect evaporation treatment is returned to the pretreatment area for recycling; and concentrated water generated in the flocculation precipitation treatment, the ultrafiltration treatment and the nanofiltration treatment is used as organic fertilizer or used for preparing organic fertilizer.
2. The gelatin wastewater treatment method according to claim 1, wherein an ultrafiltration membrane with a pore diameter of 1-200 nm is selected for ultrafiltration treatment, and the pressure of the ultrafiltration treatment is 0.1-1 MPa.
3. The gelatin wastewater treatment method according to claim 1, wherein a nanofiltration membrane with a pore diameter of 1-5 nm is selected in the nanofiltration treatment, the pH value of the inlet water of the nanofiltration treatment is 6.5-11.0, the pressure of the nanofiltration treatment is 1-4 MPa, and the membrane flux is 10-35L/m2·h。
4. The gelatin wastewater treatment method according to claim 1, wherein a reverse osmosis membrane with a pore diameter of 0.5nm to 10nm is selected for reverse osmosis treatment, the pH value of inlet water for reverse osmosis treatment is 5.0 to 10.0, the pressure for reverse osmosis treatment is 4 to 8MPa, and the membrane flux is 30 to 60L/m2·h。
5. The gelatin wastewater treatment method as claimed in claim 1, wherein the MVR evaporation treatment conditions comprise: the temperature is 0-60 ℃, the pressure is 0.1-0.3 MPa, and the solid content is 3-12%; the conditions of the triple effect evaporation treatment include: the temperature is 60-120 ℃, the pressure is 0.1-0.4 MPa, and the solid content is 20-30%; the conditions of the single-effect evaporation treatment include: the temperature is 80-170 ℃, the pressure is 0.1-0.4 MPa, and the solid content is 60-70%.
6. The gelatin wastewater treatment method as claimed in claim 1, wherein the method further comprises: and after cooling and slicing to prepare calcium chloride dihydrate, performing dry granulation on the prepared calcium chloride dihydrate, wherein the granulation diameter range is 1-5 mm, and then packaging and stacking to prepare the snow-melting agent for sale.
7. The gelatin wastewater treatment method as claimed in claim 1, wherein the method further comprises: and lime milk is added into part or all of the clear water generated in the reverse osmosis treatment, the MVR evaporation treatment, the three-effect evaporation treatment and the single-effect evaporation treatment, and the filtered supernatant is returned to the pretreatment area for recycling after standing and precipitating.
8. A gelatin wastewater treatment system, comprising: a pretreatment section, a membrane treatment section and an evaporation concentration crystallization section;
the pretreatment section comprises: the device comprises a dosing tank and a flocculation precipitation tank, wherein the upstream of the dosing tank is communicated with a discharge port of gelatin wastewater, the downstream of the dosing tank is communicated with the flocculation precipitation tank, and the flocculation precipitation tank comprises a discharge port of precipitated slurry and a clear liquid outlet;
the membrane treatment stage comprises: the device comprises an ultrafiltration device, a nanofiltration device and a reverse osmosis device which are sequentially communicated, wherein the upstream of the ultrafiltration device is communicated with a clear liquid water outlet of a flocculation precipitation tank, the ultrafiltration device also comprises a discharge port for concentrating slurry, the nanofiltration device also comprises a concentrated water outlet, and the reverse osmosis device comprises a concentrated water outlet and a clear water outlet;
the evaporation concentration crystallization section comprises: the MVR evaporation device, the triple-effect evaporation device, the single-effect evaporation device and the cooling slicing device are sequentially communicated, and the upstream of the MVR evaporation device is communicated with a concentrated water outlet of the reverse osmosis device;
wherein, the clear water outlet of the reverse osmosis device, the MVR evaporation plant, the triple-effect evaporation plant and the single-effect evaporation plant are also respectively communicated with the medicine feeding groove.
9. The gelatin wastewater treatment system of claim 8, wherein the system further comprises: and the granulating device is connected with the cooling slicing device and is used for carrying out dry granulation on the calcium chloride dihydrate output by the cooling slicing device, and the granulation diameter range is 1-5 mm.
10. The gelatin wastewater treatment system of claim 8, wherein the system further comprises: and the inlet of the lime milk generator is respectively connected with the clean water outlet of the reverse osmosis device, the MVR evaporation device, the three-effect evaporation device and the single-effect evaporation device and is communicated, and the outlet of the lime milk generator is communicated with the chemical feeding groove.
CN202110656496.8A 2021-06-11 2021-06-11 Gelatin wastewater treatment method and treatment system Pending CN113443766A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114044599A (en) * 2021-10-21 2022-02-15 安徽普朗膜技术有限公司 Processing method and processing system of seafood cleaning water

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114044599A (en) * 2021-10-21 2022-02-15 安徽普朗膜技术有限公司 Processing method and processing system of seafood cleaning water
CN114044599B (en) * 2021-10-21 2023-12-05 安徽普朗膜技术有限公司 Treatment method and treatment system for seafood cleaning water

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