CN117447029A - Treatment method and treatment system for coffee wastewater - Google Patents
Treatment method and treatment system for coffee wastewater Download PDFInfo
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- CN117447029A CN117447029A CN202311780705.5A CN202311780705A CN117447029A CN 117447029 A CN117447029 A CN 117447029A CN 202311780705 A CN202311780705 A CN 202311780705A CN 117447029 A CN117447029 A CN 117447029A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 76
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 40
- 238000006243 chemical reaction Methods 0.000 claims abstract description 37
- 238000005189 flocculation Methods 0.000 claims abstract description 35
- 230000016615 flocculation Effects 0.000 claims abstract description 35
- 238000001704 evaporation Methods 0.000 claims abstract description 26
- 238000005086 pumping Methods 0.000 claims abstract description 26
- 230000008020 evaporation Effects 0.000 claims abstract description 23
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000003825 pressing Methods 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims abstract description 14
- 238000001914 filtration Methods 0.000 claims abstract description 13
- 239000002131 composite material Substances 0.000 claims abstract description 11
- 239000001814 pectin Substances 0.000 claims abstract description 10
- 235000010987 pectin Nutrition 0.000 claims abstract description 10
- 229920001277 pectin Polymers 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims abstract description 8
- 238000011197 physicochemical method Methods 0.000 claims abstract description 8
- 239000011790 ferrous sulphate Substances 0.000 claims abstract description 7
- 235000003891 ferrous sulphate Nutrition 0.000 claims abstract description 7
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 7
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims abstract description 7
- 230000003647 oxidation Effects 0.000 claims abstract description 7
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 9
- 230000003311 flocculating effect Effects 0.000 claims description 8
- 229910001410 inorganic ion Inorganic materials 0.000 claims description 7
- 239000002893 slag Substances 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
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- 229920002401 polyacrylamide Polymers 0.000 claims description 6
- 125000002091 cationic group Chemical group 0.000 claims description 5
- 239000007791 liquid phase Substances 0.000 claims description 4
- 239000010802 sludge Substances 0.000 claims description 4
- 238000005345 coagulation Methods 0.000 claims description 3
- 230000015271 coagulation Effects 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims description 3
- 238000005188 flotation Methods 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 claims description 3
- 239000002910 solid waste Substances 0.000 claims description 3
- 238000011268 retreatment Methods 0.000 claims 2
- 239000012535 impurity Substances 0.000 claims 1
- 238000004064 recycling Methods 0.000 abstract description 5
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 230000003139 buffering effect Effects 0.000 abstract 1
- 238000003672 processing method Methods 0.000 abstract 1
- 239000010865 sewage Substances 0.000 description 8
- 238000004065 wastewater treatment Methods 0.000 description 8
- 235000013399 edible fruits Nutrition 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000012958 reprocessing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000033116 oxidation-reduction process Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 239000008213 purified water Substances 0.000 description 2
- CVOFKRWYWCSDMA-UHFFFAOYSA-N 2-chloro-n-(2,6-diethylphenyl)-n-(methoxymethyl)acetamide;2,6-dinitro-n,n-dipropyl-4-(trifluoromethyl)aniline Chemical compound CCC1=CC=CC(CC)=C1N(COC)C(=O)CCl.CCCN(CCC)C1=C([N+]([O-])=O)C=C(C(F)(F)F)C=C1[N+]([O-])=O CVOFKRWYWCSDMA-UHFFFAOYSA-N 0.000 description 1
- 208000023445 Congenital pulmonary airway malformation Diseases 0.000 description 1
- 239000012028 Fenton's reagent Substances 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229920006322 acrylamide copolymer Polymers 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003851 biochemical process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- YIOJGTBNHQAVBO-UHFFFAOYSA-N dimethyl-bis(prop-2-enyl)azanium Chemical compound C=CC[N+](C)(C)CC=C YIOJGTBNHQAVBO-UHFFFAOYSA-N 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- WSFSSNUMVMOOMR-UHFFFAOYSA-N formaldehyde Substances O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 1
- 235000021022 fresh fruits Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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
- C02F1/02—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
- C02F1/52—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
-
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention relates to a method and a system for treating coffee wastewater. The processing method comprises the following steps: removing large-particle solid matters through a physicochemical method; pumping wastewater into a middle tank for buffering, automatically flowing into a flocculation spiral shell stacking machine, adding a composite flocculant for flocculation reaction, and separating floccules formed by pectin and small particulate matters by the spiral shell stacking machine to generate primary filtered clear water; then adjusting the pH value, adding hydrogen peroxide and ferrous sulfate solution, and carrying out Fenton reaction; adjusting the pH value again, adding a composite flocculant to perform flocculation reaction, and pumping the wastewater into a high-pressure plate-and-frame filter press in full quantity to perform filter pressing; pumping the oxidation filtration wastewater into an MVR evaporator for evaporation to remove organic matters in the coffee wastewater, and enabling the evaporated condensed water to enter a water supply tank before reverse osmosis; and pumping the wastewater in the water supply tank before reverse osmosis into a two-stage reverse osmosis treatment device to obtain clean water. The treatment method of the invention removes pollutants in coffee wastewater and realizes the recycling of water resources.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a method and a system for treating coffee wastewater.
Background
The coffee processing enterprises are seasonal production enterprises, and carry out fresh fruit processing in the picking period of fresh coffee fruits, and the annual processing date is about 150 days. During this process, a wastewater is produced comprising washing, dehulling and degumming, the amount of wastewater per day being 100m 3 and/D. The wastewater has complex components, high organic pollutant and ammonia nitrogen content, but poor biodegradability. In addition, the sewage contains fat and soluble protein, exists in the form of colloid, suspension and emulsion, and belongs to one of the industrial wastewater which is difficult to treat.
The existing coffee wastewater treatment process is based on physical and chemical pretreatment and biochemical treatment, wherein the biochemical process requires bacteria to cultivate and domesticate from starting to normal operation, so that good treatment effect is difficult to obtain in a short time, and the requirements on wastewater quantity and water quality are severe, and the risk of exceeding the standard is extremely high. In addition, the conventional biochemical treatment process at present needs more than 2 weeks from the start to the normal operation, cannot meet the real-time processing of fresh coffee fruits, and has poor water quality after the conventional treatment process treatment and low recycling rate.
Accordingly, improvements are needed in the art.
Disclosure of Invention
In the prior art, the conventional biochemical treatment process at present needs more than 2 weeks from the start to the normal operation, cannot meet the real-time processing of fresh coffee fruits, and has poor water quality and low recycling rate after being treated by the conventional treatment process, so the invention provides a treatment method and a treatment system of coffee wastewater, which are used for solving the problems.
To achieve the above object, in a first aspect, the present invention provides a method for treating coffee wastewater, comprising the following specific steps:
s1, removing large-particle solid matters in coffee peeling washing wastewater through a physicochemical method;
s2, pumping the wastewater treated in the step S1 into a middle tank for caching, automatically flowing into a flocculation spiral shell stacking machine, adding a composite flocculant for flocculation reaction, and separating flocculating bodies formed by pectin and small particulate matters through the flocculation spiral shell stacking machine to generate primary filtered clear water;
s3, pumping the wastewater treated in the step S2 into a Fenton reactor, adjusting the pH value, and adding hydrogen peroxide and ferrous sulfate solution to perform Fenton reaction;
s4, after the Fenton reaction is finished, the pH value of wastewater after the Fenton reaction is adjusted, a composite flocculant is added for flocculation reaction, and the reacted wastewater is fully pumped into a high-pressure plate-and-frame filter press for filter pressing, so that oxidized and filtered wastewater is generated;
s5, pumping the oxidation filtration wastewater into an MVR evaporator for evaporation, removing organic matters in the coffee wastewater, and enabling condensed water obtained by evaporation to enter a reverse osmosis front water feeding tank;
s6, pumping the wastewater in the water supply tank before reverse osmosis into a two-stage reverse osmosis treatment device to remove soluble organic matters and inorganic ions, so as to obtain clean water.
In one implementation, in S1, the treatment by physicochemical methods includes one or more of coagulation sedimentation, flotation, and filtration.
In one implementation, in S1, the treatment by a physicochemical method is filtering by a dragveyer.
In one implementation, in S3, specifically includes: pumping the wastewater treated in the step S2 into a Fenton reactor, adding sulfuric acid to adjust the pH value to 3-4 after the wastewater is pumped into the Fenton reactor for 80% of the volume, adding 27.5% hydrogen peroxide to the Fenton reactor until the ORP value is more than 350mv, and adding ferrous sulfate solution with the volume equal to that of the hydrogen peroxide, wherein the reaction time is 60 minutes.
In one implementation, in S4, specifically includes: and adding sodium hydroxide solution to adjust the pH value of wastewater after Fenton reaction to 7-8, adding cationic polyacrylamide and polyaluminium chloride to perform flocculation reaction, pumping the total amount of wastewater after reaction into a high-pressure plate-and-frame filter press to perform filter pressing, generating oxidized and filtered wastewater and obtaining Fenton sludge, and inputting filtrate of the high-pressure plate frame into a water storage tank before MVR evaporation.
In one implementation, in S5, after the oxidation filtration wastewater is evaporated by the MVR evaporator, a mixed salt solid waste is generated for landfill treatment.
In one implementation, in S6, after the wastewater in the water supply tank before reverse osmosis is subjected to first-stage reverse osmosis, the obtained concentrated water enters the MVR evaporator for reprocessing, the obtained produced water enters the second-stage reverse osmosis, the produced water of the second-stage reverse osmosis enters the water return tank, and the concentrated water of the second-stage reverse osmosis enters the first-stage reverse osmosis for reprocessing.
In a second aspect, the present invention further provides a system for treating coffee wastewater, which is configured to implement the method for treating coffee wastewater according to any one of the above aspects, specifically including:
the rotary slag dragging machine is connected with the waste water outlet and is used for removing large-particle solid matters in the coffee peeling washing waste water through physical and chemical treatment;
the flocculation spiral shell stacking machine is connected with the rotary slag dragging machine and is used for carrying out flocculation reaction to isolate flocculating constituents formed by pectin and small particulate matters and then generate primary filtered clear water;
the Fenton reactor is connected with the flocculation spiral shell stacking machine and is used for carrying out Fenton reaction;
the high-pressure plate-and-frame filter press is connected with the Fenton reactor and is used for pumping the total amount of reacted wastewater into the high-pressure plate-and-frame filter press for filter pressing and generating oxidized and filtered wastewater;
the MVR evaporator is connected with the high-pressure plate-and-frame filter press and is used for evaporating wastewater obtained by filter pressing; and
and the double-stage reverse osmosis unit is connected with the MVR evaporator and is used for removing soluble organic matters and inorganic ions from condensed water obtained by evaporation to obtain clean water.
In one implementation, the coffee wastewater treatment system further comprises a Fenton pre-buffer tank disposed between the flocculation screw folding machine and the Fenton reactor for collecting the liquid phase isolated by the flocculation screw folding machine.
In one implementation, the coffee wastewater treatment system further comprises a water storage tank before MVR evaporation, wherein the water storage tank before MVR evaporation is arranged between the high-pressure plate-and-frame filter press and the MVR evaporator, and the water storage tank before MVR evaporation is used for collecting filtrate after filter pressing by the high-pressure plate-and-frame filter press.
The beneficial effects are that: according to the treatment method and the treatment system for the coffee wastewater, provided by the invention, the solid substances and the pectin can be separated efficiently through the combination of a physical and chemical method and flocculation and spiral shell stacking, so that the efficient separation is realized, and the burden of subsequent treatment is greatly reduced; the Fenton reactor can effectively decompose organic matters which are difficult to biodegrade, and simultaneously convert the organic matters into a form which is easier to treat, so that the advanced treatment of coffee wastewater is realized; by arranging the plate-and-frame filter press, the solid and the water can be efficiently separated from the wastewater, so that the treatment capacity of the MVR evaporator is reduced, and the overall efficiency is improved; the MVR evaporator can effectively improve the utilization rate of energy, and can recycle part of steam in a recompression way, so that the overall energy consumption is reduced; the high-quality clean water can be obtained through the two-stage reverse osmosis treatment and reused in production, so that the recycling of water resources is realized; the treatment method of the coffee wastewater combines the physicochemical treatment, fenton reaction and two-stage reverse osmosis process, so that various pollutants in the coffee wastewater are removed, the pollution to the environment is avoided, and a solution is provided for a sustainable production mode.
Drawings
FIG. 1 is a flow chart of steps of a method for treating coffee wastewater provided by the invention;
fig. 2 is a block diagram of a coffee wastewater treatment system provided by the invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. Furthermore, the descriptions of the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., described below mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily for the same embodiment or example. The technical features of the respective embodiments of the present invention may be combined with each other as long as they do not collide with each other.
Referring to fig. 1, fig. 1 is a flow chart of steps of a method for treating coffee wastewater according to the present invention.
The invention provides a method for treating coffee wastewater, which comprises the following specific steps:
s1, removing large-particle solid matters in coffee peeling washing wastewater through a physicochemical method;
s2, pumping the wastewater treated in the step S1 into a middle tank for caching, automatically flowing into a spiral shell stacking machine, adding a composite flocculant for flocculation reaction, and separating flocculating bodies formed by pectin and small particulate matters through the spiral shell stacking machine to generate primary filtered clear water;
s3, pumping the wastewater treated in the step S2 into a Fenton reactor, adjusting the pH value, and adding hydrogen peroxide and ferrous sulfate solution to perform Fenton reaction;
s4, after the Fenton reaction is finished, the pH value of wastewater after the Fenton reaction is adjusted, a composite flocculant is added for flocculation reaction, and the reacted wastewater is fully pumped into a high-pressure plate-and-frame filter press for filter pressing, so that oxidized and filtered wastewater is generated;
s5, pumping the oxidation filtration wastewater into an MVR evaporator for evaporation, removing organic matters in the coffee wastewater, and enabling condensed water obtained by evaporation to enter a reverse osmosis front water feeding tank;
s6, pumping the wastewater in the water supply tank before reverse osmosis into a two-stage reverse osmosis treatment device to remove soluble organic matters and inorganic ions, so as to obtain clean water.
Referring to fig. 2, fig. 2 is a block diagram of a system for treating coffee waste water according to the present invention.
The invention also provides a treatment system of the coffee wastewater, which is used for realizing the treatment method of the coffee wastewater, and specifically comprises the following steps:
the rotary slag dragging machine is connected with the waste water outlet and is used for removing large-particle solid matters in the coffee peeling washing waste water through physical and chemical treatment;
the flocculation spiral shell stacking machine is connected with the rotary slag dragging machine and is used for carrying out flocculation reaction to isolate flocculating constituents formed by pectin and small particulate matters and then generate primary filtered clear water;
the Fenton reactor is connected with the flocculation spiral shell stacking machine and is used for carrying out Fenton reaction;
the high-pressure plate-and-frame filter press is connected with the Fenton reactor and is used for pumping the total amount of reacted wastewater into the high-pressure plate-and-frame filter press for filter pressing and generating oxidized and filtered wastewater;
the MVR evaporator is connected with the high-pressure plate-and-frame filter press and is used for evaporating wastewater obtained by filter pressing; and
and the double-stage reverse osmosis unit is connected with the MVR evaporator and is used for removing soluble organic matters and inorganic ions from condensed water obtained by evaporation to obtain clean water.
Further, the coffee wastewater treatment system further comprises a Fenton front buffer tank, wherein the Fenton front buffer tank is arranged between the flocculation spiral shell stacking machine and the Fenton reactor and is used for collecting liquid phase isolated by the flocculation spiral shell stacking machine. The coffee wastewater treatment system further comprises a water storage tank before MVR evaporation, wherein the water storage tank before MVR evaporation is arranged between the high-pressure plate-and-frame filter press and the MVR evaporator, and the water storage tank before MVR evaporation is used for collecting filtrate after the filter pressing of the high-pressure plate-and-frame filter press.
Specifically, in S1, the treatment by physicochemical methods includes one or more of coagulation sedimentation, flotation, and filtration. Preferably, the physical and chemical treatment is filtering by a dragveyer. The stage is mainly used for removing suspended matters and a part of macromolecular organic matters in the wastewater, including large-particle solid matters such as coffee inferior fruits, fruit peels, fruit branches and the like, and is convenient for reducing the load of the subsequent treatment stage.
In S2, in this step, the composite flocculant comprises an inorganic flocculant and an organic polymeric flocculant, the inorganic flocculant being polyaluminum chloride and/or Al 2 (SO 4 ) 3 The organic polymeric flocculant is one or more of cationic polyacrylamide, dimethyl diallyl ammonium chloride-acrylamide copolymer and cationic dicyandiamide-formaldehyde polycondensate. Preferably, in this step, the composite flocculant is polyaluminum chloride (PAC) and an anionic polyacrylamide (a-type ionic flocculant, APAM). The polyaluminium chloride plays a role of a coagulant in the sewage treatment process, and can coagulate organic matters COD, oils, heavy metal ions, chromaticity, turbidity, total phosphorus and the like in the sewage; the polyacrylamide plays a role of a flocculating agent in the sewage treatment process, can assist the polyaluminium chloride to be aggregated into alum blossom together, and then separates pollutants to realize solid-liquid separation. The flocculation spiral shell machine is a spiral shell formula sludge dewatering machine, and the flocculation reaction is carried out by adding an A-type ionic flocculant (APAM) and polyaluminium chloride (PAC), so that pectin and small particulate matters form floccules which are separated from liquid phases in the flocculation spiral shell machine, and clear water automatically flows to the Fenton front buffer tank.
In S3, the Fenton reactor is operated with Fenton reagent (hydroperoxide and Fe 2+ ) Under proper pH and temperature, high-activity hydroxyl free radicals are generated, and the free radicals can non-selectively oxidize organic matters in the wastewater to realize conversion or harmless treatment. Specifically, S3 includes: pumping the wastewater treated in the step S2 into a Fenton reactor, and pumping the wastewater into the reactorAnd adding sulfuric acid after 80% volume to adjust the pH value to 3-4, adding 27.5% hydrogen peroxide to the Fenton reactor ORP value of more than 350mv, and adding ferrous sulfate solution with the same volume as the hydrogen peroxide, wherein the reaction time is 60 minutes. In addition, because the traditional oxidation-reduction water treatment technology has the defects of inaccurate control conditions, medicament waste, unfriendly environment and the like, an ORP measuring instrument is used in the technology, and the electric signal of the ORP is used as a detection and control means, the accurate control level of the oxidation-reduction water treatment technology is improved, and thus the treatment effect is improved.
Specifically, in S4, the composite flocculant is preferably polyaluminum chloride (PAC) and cationic polyacrylamide (C-ion flocculant, CPAM). The method specifically comprises the following steps: and adding sodium hydroxide solution to adjust the pH value of wastewater after Fenton reaction to 7-8, adding C-type ion flocculant and polyaluminium chloride to perform flocculation reaction, pumping the total amount of wastewater after reaction into a high-pressure plate-and-frame filter press to perform filter pressing, generating oxidized and filtered wastewater and obtaining Fenton sludge, and inputting filtrate of the high-pressure plate-and-frame into a water storage tank before MVR evaporation.
Specifically, in S5, purified water in the waste liquid is efficiently extracted by evaporation, and valuable contaminants in the waste liquid can be well reserved, so that the solid extract and purified water can be used as resources for secondary use, and meanwhile, compared with the traditional heating evaporation technology, the energy consumption is remarkably reduced. The process is carried out by an MVR evaporator, which is an energy recovery device, which can recompress the steam in the wastewater into high temperature steam, which is then used as the heat source of the evaporator. The organic matters in the coffee wastewater can be removed rapidly at this stage, and the removal efficiency of the subsequent reverse osmosis process is improved. Specifically, after the oxidation filtration wastewater is evaporated by an MVR evaporator, the generated mixed salt solid waste is subjected to landfill treatment.
In S6, after the wastewater in the water supply tank before reverse osmosis passes through the first-stage reverse osmosis, the obtained concentrated water enters the MVR evaporator for reprocessing, the obtained produced water enters the second-stage reverse osmosis, the produced water of the second-stage reverse osmosis enters the water return tank, and the concentrated water of the second-stage reverse osmosis enters the first-stage reverse osmosis for reprocessing. That is, the wastewater firstly passes through a first-stage reverse osmosis membrane (RO), and is subjected to preliminary advanced treatment to remove most of soluble organic matters and inorganic ions; and then the damaged water passes through a second section RO, so that the purity of the damaged water is further improved, and clean water which can be directly reused is obtained. Through the double-stage reverse osmosis unit, the ion removal rate is higher than that of a single stage, and can reach more than 99.9%.
In one embodiment, the coffee wastewater treatment system provided by the invention is operated, and the relevant detection data of each process treatment unit are shown in table 1.
TABLE 1 summary of the efficiency of the process stages
Wherein COD (Chemical Oxygen Demand) is an analytical index commonly used in sewage treatment, and reflects the content of harmful substances which are not easy to be degraded by biochemical degradation in the sewage by measuring the oxygen demand of organic matters in the sewage. SS (Suspended Solid) is suspended particulate matter, which is a very important contaminant in sewage treatment, and is usually suspended in water as sediment, organic particulate matter, bacteria and other organic matter. As can be seen from Table 1, the coffee wastewater treatment system provided by the invention can achieve higher wastewater removal rate through the rotary slag conveyor, the flocculation screw stacking machine, the Fenton reactor, the high-pressure plate-and-frame filter press, the MVR evaporator and the MVR evaporator, and is convenient for generating clean water.
In general, the method and the system for treating the coffee wastewater can effectively separate solid substances and pectin through the combination of a physicochemical method and flocculation and spiral shell stacking, realize the high-efficiency separation and greatly reduce the burden of subsequent treatment; the Fenton reactor can effectively decompose organic matters which are difficult to biodegrade, and simultaneously convert the organic matters into a form which is easier to treat, so that the advanced treatment of coffee wastewater is realized; by arranging the plate-and-frame filter press, the solid and the water can be efficiently separated from the wastewater, so that the treatment capacity of the MVR evaporator is reduced, and the overall efficiency is improved; the MVR evaporator can effectively improve the utilization rate of energy, and can recycle part of steam in a recompression way, so that the overall energy consumption is reduced; the high-quality clean water can be obtained through the two-stage reverse osmosis treatment and reused in production, so that the recycling of water resources is realized; the treatment method of the coffee wastewater combines the physicochemical treatment, fenton reaction and two-stage reverse osmosis process, so that various pollutants in the coffee wastewater are removed, the pollution to the environment is avoided, and a solution is provided for a sustainable production mode.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes using the descriptions and drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the invention.
Claims (10)
1. The method for treating the coffee wastewater is characterized by comprising the following specific steps of:
s1, removing large-particle solid matters in coffee peeling washing wastewater through a physicochemical method;
s2, pumping the wastewater treated in the step S1 into a middle tank for caching, automatically flowing into a flocculation spiral shell stacking machine, adding a composite flocculant for flocculation reaction, and separating flocculating bodies formed by pectin and small particulate matters through the flocculation spiral shell stacking machine to generate primary filtered clear water;
s3, pumping the wastewater treated in the step S2 into a Fenton reactor, adjusting the pH value, and adding hydrogen peroxide and ferrous sulfate solution to perform Fenton reaction;
s4, after the Fenton reaction is finished, the pH value of wastewater after the Fenton reaction is adjusted, a composite flocculant is added for flocculation reaction, and the reacted wastewater is fully pumped into a high-pressure plate-and-frame filter press for filter pressing, so that oxidized and filtered wastewater is generated;
s5, pumping the oxidation filtration wastewater into an MVR evaporator for evaporation, removing organic matters in the coffee wastewater, and enabling condensed water obtained by evaporation to enter a reverse osmosis front water feeding tank;
s6, pumping the wastewater in the water supply tank before reverse osmosis into a two-stage reverse osmosis treatment device to remove soluble organic matters and inorganic ions, so as to obtain clean water.
2. The method of treating coffee waste water according to claim 1, wherein in S1, the treatment by physicochemical means comprises one or more of coagulation sedimentation, flotation and filtration.
3. The method according to claim 2, wherein in S1, the treatment by physicochemical means is filtration using a dragveyer.
4. The method for treating coffee waste water according to claim 1, wherein in S3, specifically comprising: pumping the wastewater treated in the step S2 into a Fenton reactor, adding sulfuric acid to adjust the pH value to 3-4 after the wastewater is pumped into the Fenton reactor for 80% of the volume, adding 27.5% hydrogen peroxide to the Fenton reactor until the ORP value is more than 350mv, and adding ferrous sulfate solution with the volume equal to that of the hydrogen peroxide, wherein the reaction time is 60 minutes.
5. The method for treating coffee waste water according to claim 1, wherein in S4, specifically comprising: and adding sodium hydroxide solution to adjust the pH value of wastewater after Fenton reaction to 7-8, adding cationic polyacrylamide and polyaluminium chloride to perform flocculation reaction, pumping the total amount of wastewater after reaction into a high-pressure plate-and-frame filter press to perform filter pressing, generating oxidized and filtered wastewater and obtaining Fenton sludge, and inputting filtrate of the high-pressure plate frame into a water storage tank before MVR evaporation.
6. The method according to claim 1, wherein in S5, the oxidation filtration wastewater is evaporated by an MVR evaporator to produce a solid waste of salt and impurities for landfill treatment.
7. The method for treating coffee wastewater according to claim 1, wherein in S6, after the wastewater in the water supply tank before reverse osmosis is subjected to first-stage reverse osmosis, the obtained concentrated water enters the MVR evaporator for retreatment, the obtained produced water enters the second-stage reverse osmosis, the produced water of the second-stage reverse osmosis enters the water return tank, and the concentrated water of the second-stage reverse osmosis enters the first-stage reverse osmosis for retreatment.
8. A system for treating coffee waste water, characterized in that it is used for realizing the method for treating coffee waste water according to any one of claims 1 to 7, and specifically comprises:
the rotary slag dragging machine is connected with the waste water outlet and is used for removing large-particle solid matters in the coffee peeling washing waste water through physical and chemical treatment;
the flocculation spiral shell stacking machine is connected with the rotary slag dragging machine and is used for carrying out flocculation reaction to isolate flocculating constituents formed by pectin and small particulate matters and then generate primary filtered clear water;
the Fenton reactor is connected with the flocculation spiral shell stacking machine and is used for carrying out Fenton reaction;
the high-pressure plate-and-frame filter press is connected with the Fenton reactor and is used for pumping the total amount of reacted wastewater into the high-pressure plate-and-frame filter press for filter pressing and generating oxidized and filtered wastewater;
the MVR evaporator is connected with the high-pressure plate-and-frame filter press and is used for evaporating wastewater obtained by filter pressing; and
and the double-stage reverse osmosis unit is connected with the MVR evaporator and is used for removing soluble organic matters and inorganic ions from condensed water obtained by evaporation to obtain clean water.
9. The system of claim 8, further comprising a pre-Fenton buffer tank disposed between the flocculating and stacking machine and the Fenton reactor for collecting liquid phase separated by the flocculating and stacking machine.
10. The system of claim 8, further comprising a pre-MVR evaporation reservoir disposed between the high pressure plate and frame filter press and the MVR evaporator, the pre-MVR evaporation reservoir configured to collect filtrate after filter pressing by the high pressure plate and frame filter press.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10216779A (en) * | 1997-02-05 | 1998-08-18 | Sumitomo Heavy Ind Ltd | Coffee waste water treatment method |
| CN103468753A (en) * | 2013-09-05 | 2013-12-25 | 山东省食品发酵工业研究设计院 | Water saving method in process of producing sodium gluconate through aspergillus niger fermentation |
| CN111410362A (en) * | 2020-03-27 | 2020-07-14 | 普洱普蓝环境咨询有限公司 | Method for treating coffee primary processing wastewater |
| CN113105022A (en) * | 2021-04-15 | 2021-07-13 | 瑞昌市久兴农业科技有限公司 | Small poultry slaughterhouse sewage treatment method |
| CN114538686A (en) * | 2022-02-15 | 2022-05-27 | 山东东顺环保科技有限公司 | Reclaimed water recycling process for treating leachate |
-
2023
- 2023-12-22 CN CN202311780705.5A patent/CN117447029A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10216779A (en) * | 1997-02-05 | 1998-08-18 | Sumitomo Heavy Ind Ltd | Coffee waste water treatment method |
| CN103468753A (en) * | 2013-09-05 | 2013-12-25 | 山东省食品发酵工业研究设计院 | Water saving method in process of producing sodium gluconate through aspergillus niger fermentation |
| CN111410362A (en) * | 2020-03-27 | 2020-07-14 | 普洱普蓝环境咨询有限公司 | Method for treating coffee primary processing wastewater |
| CN113105022A (en) * | 2021-04-15 | 2021-07-13 | 瑞昌市久兴农业科技有限公司 | Small poultry slaughterhouse sewage treatment method |
| CN114538686A (en) * | 2022-02-15 | 2022-05-27 | 山东东顺环保科技有限公司 | Reclaimed water recycling process for treating leachate |
Non-Patent Citations (1)
| Title |
|---|
| 郑称德等: "《儒家思想能促进企业创新吗？》", 31 January 2021, 华中科技大学出版社, pages: 108 * |
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