CN111320313A - System and process for treating water in water tank of printing plant and CTP printing plate flushing water to reach discharge standard - Google Patents
System and process for treating water in water tank of printing plant and CTP printing plate flushing water to reach discharge standard Download PDFInfo
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- CN111320313A CN111320313A CN202010242164.0A CN202010242164A CN111320313A CN 111320313 A CN111320313 A CN 111320313A CN 202010242164 A CN202010242164 A CN 202010242164A CN 111320313 A CN111320313 A CN 111320313A
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- water
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 178
- 238000007639 printing Methods 0.000 title claims abstract description 61
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 38
- 238000005189 flocculation Methods 0.000 claims description 97
- 230000016615 flocculation Effects 0.000 claims description 97
- 238000006243 chemical reaction Methods 0.000 claims description 69
- 238000001914 filtration Methods 0.000 claims description 63
- 239000010865 sewage Substances 0.000 claims description 48
- 238000006555 catalytic reaction Methods 0.000 claims description 24
- 239000008394 flocculating agent Substances 0.000 claims description 21
- 230000003647 oxidation Effects 0.000 claims description 17
- 238000007254 oxidation reaction Methods 0.000 claims description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 230000003197 catalytic effect Effects 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 239000000945 filler Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 238000001556 precipitation Methods 0.000 claims description 6
- 230000001376 precipitating effect Effects 0.000 claims description 5
- 239000012535 impurity Substances 0.000 abstract description 17
- 239000003344 environmental pollutant Substances 0.000 abstract description 11
- 239000012528 membrane Substances 0.000 abstract description 11
- 231100000719 pollutant Toxicity 0.000 abstract description 11
- 241000894006 Bacteria Species 0.000 abstract description 5
- 241000700605 Viruses Species 0.000 abstract description 5
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 5
- 239000002352 surface water Substances 0.000 abstract description 3
- 241000196324 Embryophyta Species 0.000 description 26
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 10
- 239000000126 substance Substances 0.000 description 10
- 238000009297 electrocoagulation Methods 0.000 description 8
- -1 sulfur sulfonates Chemical class 0.000 description 7
- 230000035622 drinking Effects 0.000 description 5
- 239000011259 mixed solution Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052500 inorganic mineral Chemical class 0.000 description 3
- 239000011707 mineral Chemical class 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- 239000010405 anode material Substances 0.000 description 2
- 238000006065 biodegradation reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000010406 cathode material Substances 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000001687 destabilization Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 150000004679 hydroxides Chemical class 0.000 description 2
- 239000003999 initiator Substances 0.000 description 2
- 239000013067 intermediate product Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 231100000647 material safety data sheet Toxicity 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910000000 metal hydroxide Inorganic materials 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229920000084 Gum arabic Polymers 0.000 description 1
- 241000978776 Senegalia senegal Species 0.000 description 1
- 235000010489 acacia gum Nutrition 0.000 description 1
- 239000000205 acacia gum Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- 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
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- 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
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- 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
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
Abstract
The invention relates to a system and a process for treating water in a water tank of a printing plant and CTP (computer to plate) flushing water to reach a discharge standard. The water in the water tank treated by the system and the process can effectively remove impurities without introducing new impurities, and the impurities mixed into a large amount of water, such as industrial pollutants, heavy metals, bacteria, viruses and the like, can be effectively and completely removed by the reverse osmosis membrane, so that the discharge standard of surface water can be completely met, the whole treatment system can realize automatic/manual control, and the stable and reliable operation of equipment is ensured.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a system and a process for treating water in a water tank of a printing plant and CTP (computer to plate) flushing water to reach a discharge standard.
Background
The printing machine can produce a large amount of heats at the during operation, if untimely effluvium will lead to the fact the harm to the printing machine, the radiating mode of the heat that produces is for communicating printing machine and water tank in the printing machine work at present, the mixed solution in the water tank enters into the printing machine through the inlet tube, contact through mixed solution and printing machine carries out the heat exchange, in order to cool down to the printing machine, on the other hand mixed solution is the printing machine and realizes the essential raw materials of printing function, promptly at the printing in-process, for reaching the balanced multiple liquid mixed water that uses of good water ink, its principal ingredients are: demineralized water, isopropanol, fountain solution (MSDS) and small amounts of ink, paper dust and other impurities mixed in during printing.
Along with the continuous progress of printing work, the water in the water tank is constantly recycled, a large amount of impurities are inevitably generated after a period of time, and if the water is not cleaned, the printing effect is greatly influenced.
CTP plate flushing water is waste water generated by flushing a photosensitive layer on a non-image-text part and CTP developing solution remained on a plate surface with a large amount of clean water in the process of manufacturing a printing plate by a CTP (direct plate-making machine) in a printing factory. The main components of the wastewater comprise: tap water, gum arabic, a CTP photosensitive layer (trace of nitrogen oxides, sulfur sulfonates), and a small amount of CTP developer (MSDS).
Both the water tank and the CTP flushing water have a large amount of substances harmful to the environment, soil and the like, so that effective treatment is required before discharge. At present, the treatment modes of water tank water and CTP plate flushing water mainly adopt simple flocculation treatment. However, the simple flocculation treatment can not meet the sewage discharge requirement at all.
In view of this, the invention is particularly proposed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a system and a process for treating water tank water and CTP plate flushing water of a printing plant to reach the discharge standard.
The invention aims to provide a system for treating water in a water tank of a printing plant and CTP (computer to plate) flushing water to reach the discharge standard.
The invention further aims to provide a process for treating water in a water tank of a printing plant and CTP (computer to plate) flushing water to reach the discharge standard by using the system.
The system for treating the water tank water and the CTP printing plate flushing water of the printing plant to reach the discharge standard comprises a flocculation reaction tank, a first filtering device, an electric flocculation device, a second filtering device, an electrocatalysis device and an RO reverse osmosis device which are connected in sequence.
The system for treating the water tank water and the CTP plate flushing water of the printing plant to reach the discharge standard according to the specific embodiment of the invention, wherein a stirring device is fixedly arranged in the flocculation reaction tank; the flocculation reaction tank is connected with the first filtering equipment through a sewage pump.
The system for treating the water tank water and the CTP printing plate flushing water of the printing plant to reach the discharge standard according to the specific embodiment of the invention, wherein the cathode and the anode of the electric flocculation equipment are both aluminum plates.
The system for treating the water tank water and the CTP printing plate flushing water of the printing plant to reach the emission standard comprises an anode, a cathode and an electrocatalytic oxidation filler filled between the anode and the cathode.
The electrocatalytic equipment adopted in the sewage treatment system comprises an anode (carbon plate), a cathode (carbon plate) and an electrocatalytic oxidation filler filled between the anode and the cathode as shown in patent CN 110734114A. The structure is that on the basis of three-dimensional electrolysis, an electrocatalytic oxidation filler is used for replacing a three-dimensional electrode, and the method is a novel catalytic oxidation technology.
The system for treating water tank water and CTP (computer to plate) flushing water of a printing plant to reach the emission standard according to the specific embodiment of the invention, wherein the anode and the cathode are made of carbon plates.
The process for treating the water tank water and the CTP plate flushing water of the printing plant to reach the discharge standard according to the specific embodiment of the invention comprises the following steps: in going into the flocculation reaction pond with mixed liquid pump that printing factory water tank water and CTP towards version water, the sewage pump after the flocculation reaction goes into first filtration equipment, and the sewage after the filtration gets into the electric flocculation equipment, filters once more through second filtration equipment after the electric flocculation precipitation, and exhaust sewage gets into the electro-catalysis equipment and carries out electrochemical treatment, and the sewage after the process is handled gets into RO reverse osmosis equipment, and the water after the reverse osmosis treatment reaches emission standard.
According to the specific embodiment of the invention, the process for treating the water tank water and the CTP plate flushing water of the printing plant to reach the discharge standard comprises the steps of adding a flocculating agent into a flocculation reaction tank for flocculation reaction, wherein the adding amount of the flocculating agent is 800-1200 g/t, continuously stirring in the reaction process, and standing and precipitating for 3-7 min after the reaction is finished.
The process for treating the water tank and CTP plate flushing water of the printing plant to reach the discharge standard comprises the following steps of treating the water tank and CTP plate flushing water of the printing plant to reach the discharge standard, wherein the voltage of the electric flocculation equipment is 20-30V, the current is 700-900A, and the electric flocculation time is 50-70 min.
The process for treating the water tank and CTP plate flushing water of the printing plant to reach the emission standard comprises the following steps of treating the water tank and CTP plate flushing water of the printing plant to reach the emission standard, wherein the electro-catalytic equipment has the catalytic voltage of 20-30V, the catalytic current of 700-900A and the catalytic time of 50-70 min.
The process for treating the water tank water and the CTP printing plate flushing water of the printing plant to reach the emission standard according to the specific embodiment of the invention, wherein the filtering precision of the first filtering device and the filtering precision of the second filtering device are both 30 micrometers, and the flow rate of the first filtering device and the flow rate of the second filtering device are both 0.2-0.4m3And/h, the pressure difference between the inlet and the outlet is 2-3 bar.
The filter cores adopted by the first filtering equipment and the second filtering equipment are woolen yarn filter cores.
The flocculating agent added into the flocculation reaction tank takes polyaluminium chloride as a main raw material, and a manufacturer is Hebei Liuyang environmental protection science and technology limited company. And adding a flocculating agent into the flocculation tank through a flocculating agent adding device for reaction.
Furthermore, all the devices in the system are connected through a pump.
In the invention, water produced by the treatment of the previous equipment is sequentially pumped into the next equipment for treatment.
Further, the RO reverse osmosis device is vertically arranged.
Therefore, the length of the filter membrane can be increased, the space occupation can be reduced to a certain extent, and the filter membrane is easy to move.
The stability of the water source to be treated is a main factor for ensuring the sewage treatment effect. In the invention, in order to ensure the stability of a water source to be treated, water in a water tank and CTP (computer to plate) flushing water are pumped into a flocculation reaction tank (pos.1) in a quantitative proportioning mode, and a flocculating agent (pos.2) is added into the reaction tank for flocculation reaction. After fully stirring and standing, flocculation reaction occurs to separate solid from liquid.
The sewage after flocculation reaction is pumped to a filtering device (pos.3) to directly filter out impurities and sediments generated by flocculation reaction.
The filtered sewage is directly pumped into an electric flocculation treatment device (pos.4) for electric flocculation treatment.
Electrocoagulation is also known as electrocoagulation, electrocoagulation. Aluminum metal is used as an anode, and the anode is dissolved under the action of direct current to generate a large amount of Al ions. The hydrogen ions are reduced at the cathode plate to produce hydroxide ions. After a series of hydrolysis and polymerization of metal ions and hydroxide ions, various hydroxyl complexes, polynuclear hydroxyl complexes and hydroxides are generated, so that colloidal impurities and suspended impurities in the wastewater are coagulated, precipitated and separated. Meanwhile, the charged pollutant particles swim in the electric field, and part of charges of the pollutant particles are neutralized by the electrodes to promote destabilization and coagulation.
The metal consumption of the electric flocculation electrode is low, the sludge yield is low, and no chemical agent is needed to be added in the reaction process, so that secondary pollution is not easy to occur.
The sewage after the electric flocculation treatment enters a filtering device (pos.5) to filter precipitates generated by the electric flocculation, so as to prepare for the electric catalysis treatment in the next link.
The filtered sewage enters an electro-catalytic device (pos.6) for electro-catalytic treatment. Electrocatalysis is a novel sewage treatment process for carrying out electrochemical treatment on sewage and effectively removing COD.
Electrocatalysis is the formation of OH groups with strong oxidation properties by anodic oxidation or anodic reaction. The OH group is not selective in oxidizing pollutants, and directly oxidizes organic matters into CO2、H2O or a mineral salt, wherein the mineral salt is selected from the group consisting of,the purpose of destroying harmful substances is realized, and no new environmental pollution is caused. The OH group is an intermediate product of the catalytic oxidation process, which acts as an initiator to induce chain reactions. Is especially suitable for biodegradation of organic matters.
The electro-catalyzed sewage enters RO reverse osmosis equipment (pos.7). The RO reverse osmosis is to pressurize the catalyzed clean water by a pump, and effectively isolate a large amount of impurities mixed into the water, such as industrial pollutants, heavy metals, bacteria, viruses and the like, by a reverse osmosis membrane, so that the physical and chemical indexes and the sanitary standard specified for drinking are achieved, and the clean water is produced.
The COD of the clear water treated by the RO reverse osmosis equipment is less than or equal to 10mg/L, and the clear water can reach the standard for discharge or recycling.
Through detection: COD (chemical oxygen demand) of the mixed liquid of the water tank water and the CTP (computer to plate) flushing water is generally 10000 mg/L; adding a flocculating agent and filtering to obtain COD (chemical oxygen demand) less than or equal to 5000 mg/L; after electrocoagulation and filtration, COD is less than or equal to 3000 mg/L; COD is less than or equal to 500mg/L after electrocatalysis treatment for one hour; COD after filtration of the RO reverse osmosis membrane is less than or equal to 10mg/L, and can completely meet the discharge standard of surface water.
The whole processing system can realize automatic/manual control. The equipment is ensured to operate stably and reliably.
Compared with the prior art, the invention has the beneficial effects that:
(1) the water tank water and CTP plate flushing water treated by the system and the process can effectively remove impurities without introducing new impurities, and industrial pollutants, heavy metals, bacteria, viruses and other impurities mixed into water can be effectively and completely removed by reverse osmosis membrane treatment, so that the physical and chemical indexes and the sanitary standard specified for drinking are achieved, clear to pure water is produced, the whole treatment system can realize automatic/manual control, and the stable and reliable operation of equipment is ensured;
(2) the COD of the stock solution of the water tank water and the CTP plate flushing water treated by the method is about 10000mg/L, and the COD of the clear water treated by the RO reverse osmosis equipment after the water tank water and the CTP plate flushing water are treated by each equipment is less than or equal to 10mg/L, so that the water can be discharged or recycled up to the standard.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a system for treating printing plant tank water, CTP flush water to discharge standards in accordance with the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
In some more specific embodiments, the system comprises a flocculation reaction tank, a first filtering device, an electric flocculation device, a second filtering device, an electric catalysis device and an RO reverse osmosis device which are connected in sequence. The cathode and the anode of the electric flocculation equipment are both aluminum plates. The anode and cathode materials of the electro-catalytic equipment are carbon plates;
the process for treating the water of the water tank and the CTP plate flushing water of the printing plant to reach the discharge standard comprises the following steps: in going into the flocculation reaction pond with mixed liquid pump that printing factory water tank water and CTP towards version water, the sewage pump after the flocculation reaction goes into first filtration equipment, and the sewage after the filtration gets into the electric flocculation equipment, filters once more through second filtration equipment after the electric flocculation precipitation, and exhaust sewage gets into the electro-catalysis equipment and carries out electrochemical treatment, and the sewage after the process is handled gets into RO reverse osmosis equipment, and the water after the reverse osmosis treatment reaches emission standard.
In a more specific embodiment, the system comprises a flocculation reaction tank, a first filtering device, an electric flocculation device, a second filtering device, an electrocatalysis device and an RO reverse osmosis device which are connected in sequence. The cathode and the anode of the electric flocculation equipment are both aluminum plates. The anode and cathode materials of the electro-catalytic equipment are carbon plates;
the process for treating the water of the water tank and the CTP plate flushing water of the printing plant to reach the discharge standard comprises the following steps: in going into the flocculation reaction pond with mixed liquid pump that printing factory water tank water and CTP towards version water, the sewage pump after the flocculation reaction goes into first filtration equipment, and the sewage after the filtration gets into the electric flocculation equipment, filters once more through second filtration equipment after the electric flocculation precipitation, and exhaust sewage gets into the electro-catalysis equipment and carries out electrochemical treatment, and the sewage after the process is handled gets into RO reverse osmosis equipment, and the water after the reverse osmosis treatment reaches emission standard. Adding a flocculating agent into the flocculation reaction tank for flocculation reaction, wherein the adding amount of the flocculating agent is 800-1200 g/t, continuously stirring in the reaction process, and standing and precipitating for 3-7 min after the reaction is finished;
the voltage of the electric flocculation equipment is 20-30V, the current is 700-900A, and the electric flocculation time is 50-70 min;
the electro-catalysis equipment has the catalysis voltage of 20-30V, the catalysis current of 700-900A and the catalysis time of 50-70 min.
Example 1
As shown in fig. 1, the system for treating printing plant tank water and CTP flushing water to reach the discharge standard of the present embodiment includes a flocculation reaction tank, a first filtering device, an electric flocculation device, a second filtering device, an electro-catalysis device and an RO reverse osmosis device, which are connected in sequence; stirring equipment is fixedly arranged in the flocculation reaction tank; the flocculation reaction tank is connected with the first filtering equipment through a sewage pump; the cathode and the anode of the electric flocculation equipment are both aluminum plates; the electrocatalytic devices respectively comprise an anode, a cathode and an electrocatalytic oxidation filler filled between the anode and the cathode; the electrocatalytic equipment adopted in the sewage treatment system comprises an anode (carbon plate), a cathode (carbon plate) and an electrocatalytic oxidation filler filled between the anode and the cathode as shown in patent CN 110734114A. The structure is that on the basis of three-dimensional electrolysis, an electrocatalytic oxidation filler is used for replacing a three-dimensional electrode, and the method is a novel catalytic oxidation technology; the anode and the cathode are made of carbon plates; first filtration equipment and second filtration equipment constitute by two parallelly connected lauter tuns, can automatic reversing through two parallelly connected lauter tuns, when pressure detection equipment detected the pressure in one of them lauter tun when too high, need change the filter media promptly, the system can be automatically switched rivers from a bucket to another bucket in filter, automatic alarm device can indicate operating personnel to change the filter media in the bucket simultaneously.
The process for treating the water of the water tank and the CTP plate flushing water of the printing plant to reach the discharge standard comprises the following steps: pumping a mixed solution of water in a water tank of a printing plant and CTP printing plate flushing water into a flocculation reaction tank, pumping sewage subjected to flocculation reaction into first filtering equipment, feeding the filtered sewage into electric flocculation equipment, performing electric flocculation precipitation, then performing secondary filtering through second filtering equipment, feeding the discharged sewage into electro-catalysis equipment for electrochemical treatment, feeding the treated sewage into RO reverse osmosis equipment, and enabling the water subjected to reverse osmosis treatment to reach the discharge standard; adding a flocculating agent into the flocculation reaction tank for flocculation reaction, wherein the adding amount of the flocculating agent is 1200g/t, continuously stirring in the reaction process, and standing and precipitating for 7min after the reaction is finished; the voltage of the electric flocculation equipment is 30V, the current is 700A, and the electric flocculation time is 70 min; the catalysis voltage of the electro-catalysis equipment is 20V, the catalysis current is 700A, and the catalysis time is 70 min; the filtering precision of the first filtering device and the second filtering device is 30 mu m, and the flow rate is 0.2m3The pressure difference between the inlet and the outlet is 3 bar; the flocculating agent added into the flocculation reaction tank takes polyaluminium chloride as a main raw material, and a manufacturer is Hebei Liuyang environmental protection science and technology limited company. Adding a flocculating agent into the flocculation tank through flocculating agent adding equipment for reaction; all the devices in the system are connected through a pump; water generated by the treatment of the previous equipment is sequentially pumped into the next equipment for treatment; the RO reverse osmosis equipment is vertically arranged, so that the length of the filter membrane can be increased, the space occupation can be reduced to a certain extent, and the RO reverse osmosis equipment is easy to move.
Example 2
As shown in fig. 1, the system for treating printing plant tank water and CTP flushing water to reach the discharge standard of the present embodiment includes a flocculation reaction tank, a first filtering device, an electric flocculation device, a second filtering device, an electro-catalysis device and an RO reverse osmosis device, which are connected in sequence; stirring equipment is fixedly arranged in the flocculation reaction tank; the flocculation reaction tank is connected with the first filtering equipment through a sewage pump; the cathode and the anode of the electric flocculation equipment are both aluminum plates; the electrocatalytic devices respectively comprise an anode, a cathode and an electrocatalytic oxidation filler filled between the anode and the cathode; the electrocatalytic equipment adopted in the sewage treatment system comprises an anode (carbon plate), a cathode (carbon plate) and an electrocatalytic oxidation filler filled between the anode and the cathode.
The process for treating the water of the water tank and the CTP plate flushing water of the printing plant to reach the discharge standard comprises the following steps: pumping a mixed solution of water in a water tank of a printing plant and CTP printing plate flushing water into a flocculation reaction tank, pumping sewage subjected to flocculation reaction into first filtering equipment, feeding the filtered sewage into electric flocculation equipment, performing electric flocculation precipitation, then performing secondary filtering through second filtering equipment, feeding the discharged sewage into electro-catalysis equipment for electrochemical treatment, feeding the treated sewage into RO reverse osmosis equipment, and enabling the water subjected to reverse osmosis treatment to reach the discharge standard; adding a flocculating agent into the flocculation reaction tank for flocculation reaction, wherein the adding amount of the flocculating agent is 1000g/t, continuously stirring in the reaction process, and standing and precipitating for 5min after the reaction is finished; the voltage of the electric flocculation equipment is 25V, the current is 800A, and the electric flocculation time is 60 min; the catalysis voltage of the electro-catalysis equipment is 25V, the catalysis current is 800A, and the catalysis time is 60 min; the filtering precision of the first filtering device and the second filtering device is 30 mu m, and the flow rate is 0.3m3The pressure difference between the inlet and the outlet is 2.5 bar; and a flocculating agent is added into the flocculation reaction tank.
More specifically, in this embodiment, to ensure the stability of the water source to be treated, the water tank water and the CTP flushing water are pumped into the flocculation reaction tank (pos.1) according to the volume ratio of 5:3, and a flocculating agent (pos.2) is added into the reaction tank to perform flocculation reaction. After fully stirring and standing, flocculation reaction occurs to separate solid from liquid.
The sewage after flocculation reaction is pumped to a filtering device (pos.3) to directly filter out impurities and sediments generated by flocculation reaction.
The filtered sewage is directly pumped into an electric flocculation treatment device (pos.4) for electric flocculation treatment.
Electrocoagulation is also known as electrocoagulation, electrocoagulation. Aluminum metal is used as an anode, and the anode is dissolved under the action of direct current to generate a large amount of Al ions. The hydrogen ions are reduced at the cathode plate to produce hydroxide ions. After a series of hydrolysis and polymerization of metal ions and hydroxide ions, various hydroxyl complexes, polynuclear hydroxyl complexes and hydroxides are generated, so that colloidal impurities and suspended impurities in the wastewater are coagulated, precipitated and separated. Meanwhile, the charged pollutant particles swim in the electric field, and part of charges of the pollutant particles are neutralized by the electrodes to promote destabilization and coagulation.
The metal consumption of the electric flocculation electrode is low, the sludge yield is low, and no chemical agent is needed to be added in the reaction process, so that secondary pollution is not easy to occur.
The sewage after the electric flocculation treatment enters a filtering device (pos.5) to filter precipitates generated by the electric flocculation, so as to prepare for the electric catalysis treatment in the next link.
The filtered sewage enters an electro-catalytic device (pos.6) for electro-catalytic treatment. Electrocatalysis is a novel sewage treatment process for carrying out electrochemical treatment on sewage and effectively removing COD.
Electrocatalysis is the formation of OH groups with strong oxidation properties by anodic oxidation or anodic reaction. The OH group is not selective in oxidizing pollutants, and directly oxidizes organic matters into CO2、H2O or mineral salt, the purpose of destroying harmful substances is realized, and no new environmental pollution is caused. The OH group is an intermediate product of the catalytic oxidation process, which acts as an initiator to induce chain reactions. Is especially suitable for biodegradation of organic matters.
The electro-catalyzed sewage enters RO reverse osmosis equipment (pos.7). The RO reverse osmosis is to pressurize the catalyzed clean water by a pump, and effectively isolate a large amount of impurities mixed into the water, such as industrial pollutants, heavy metals, bacteria, viruses and the like, by a reverse osmosis membrane, so that the physical and chemical indexes and the sanitary standard specified for drinking are achieved, and the clean water is produced.
The catalyst in the electrocatalytic treatment device in the embodiment adopts the existing raw material, and the catalyst is shown in patent ZL 200710061391.8.
In the RO reverse osmosis apparatus in this example, the RO reverse osmosis membrane was made of Dongli brand and the treatment amount was 0.3m3H is used as the reference value. The RO reverse osmosis equipment is used for pressurizing the catalyzed clean water through a pump, and effectively removing a large amount of impurities mixed into the water, such as industrial pollutants, heavy metals, bacteria, viruses and the like, through a reverse osmosis membrane, so that the physical and chemical indexes and the sanitary standard specified for drinking are achieved, and the clean water is produced.
Processing criteria of the invention:
the system and the process of the invention are used for treating water tank water and CTP plate flushing water, and the COD of clear water treated by RO reverse osmosis equipment is less than or equal to 10mg/L, thus achieving the standard of discharge or recycling.
The water before and after treatment in examples 1 and 2 was tested and the results are shown in Table 1 below:
TABLE 1 Water quality test results before and after treatment
From table 1, it can be seen that the system and process of the present invention can be used for treating mixed water of water tank water and CTP plate flushing water, and the water treated by the system and process of the present invention can reach the physicochemical index and sanitary standard specified for drinking.
The water was tested during the treatment in examples 1 and 2 and other experimental examples treated using the system and process of the present invention: after the two liquids of the water tank and the CTP plate flushing water are mixed, the COD is 9000-11000 mg/L; adding a flocculating agent and filtering to obtain COD (chemical oxygen demand) less than or equal to 5000 mg/L; after electrocoagulation and filtration, COD is less than or equal to 3000 mg/L; COD is less than or equal to 500mg/L after electrocatalysis treatment for one hour; COD after filtration of the RO reverse osmosis membrane is less than or equal to 10mg/L, and can completely meet the discharge standard of surface water.
The whole processing system can realize automatic/manual control. The equipment is ensured to operate stably and reliably.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The utility model provides a system for be used for handling printing factory water tank water, CTP towards version water and reach discharge standard, its characterized in that, the system including the flocculation reaction pond, first filtration equipment, electric flocculation equipment, second filtration equipment, electro-catalysis equipment and the RO reverse osmosis equipment that connect gradually.
2. The system for treating printing plant tank water and CTP printing plate flushing water to reach the discharge standard according to claim 1, wherein a stirring device is fixedly arranged in the flocculation reaction tank; the flocculation reaction tank is connected with the first filtering equipment through a sewage pump.
3. The system for treating printing plant tank water and CTP flushing water to reach the discharge standard according to claim 1, wherein the cathode and the anode of the electric flocculation device are both aluminum plates.
4. The system for treating printing plant tank water, CTP flushing water to emission standards according to claim 1, wherein the electrocatalytic devices each comprise an anode, a cathode and an electrocatalytic oxidation filler filled therebetween.
5. The system of claim 1, wherein said anode and said cathode are both carbon plates.
6. A process for treating printing plant tank water, CTP flushing water to emission standards using the system of any one of claims 1-5, wherein said process comprises: in going into the flocculation reaction pond with mixed liquid pump that printing factory water tank water and CTP towards version water, the sewage pump after the flocculation reaction goes into first filtration equipment, and the sewage after the filtration gets into the electric flocculation equipment, filters once more through second filtration equipment after the electric flocculation precipitation, and exhaust sewage gets into the electro-catalysis equipment and carries out electrochemical treatment, and the sewage after the process is handled gets into RO reverse osmosis equipment, and the water after the reverse osmosis treatment reaches emission standard.
7. The process according to claim 6, wherein a flocculating agent is added into the flocculation reaction tank for flocculation reaction, the adding amount of the flocculating agent is 800-1200 g/t, the reaction is continuously stirred, and standing and precipitating are carried out for 3-7 min after the reaction is finished.
8. The process according to claim 6, wherein the voltage of the electric flocculation equipment is 20-30V, the current is 700-900A, and the electric flocculation time is 50-70 min.
9. The process according to claim 6, wherein the electro-catalytic device has a catalytic voltage of 20-30V, a catalytic current of 700-900A, and a catalytic time of 50-70 min.
10. The process according to claim 6, wherein the first filtering device and the second filtering device have filtering precision of 30 μm and flow rate of 0.2-0.4m3And/h, the pressure difference between the inlet and the outlet is 2-3 bar.
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