CN113788584A - Machining wastewater treatment method and industrial wastewater purification method - Google Patents
Machining wastewater treatment method and industrial wastewater purification method Download PDFInfo
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- 238000003754 machining Methods 0.000 title claims abstract description 34
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 29
- 239000010842 industrial wastewater Substances 0.000 title claims abstract description 10
- 238000000746 purification Methods 0.000 title abstract description 23
- 239000002351 wastewater Substances 0.000 claims abstract description 285
- 238000001914 filtration Methods 0.000 claims abstract description 126
- 238000006243 chemical reaction Methods 0.000 claims abstract description 51
- 238000005342 ion exchange Methods 0.000 claims abstract description 46
- 239000000701 coagulant Substances 0.000 claims abstract description 20
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 238000011084 recovery Methods 0.000 claims abstract description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- 238000004062 sedimentation Methods 0.000 claims description 12
- 238000007667 floating Methods 0.000 claims description 11
- 239000004576 sand Substances 0.000 claims description 8
- 238000005188 flotation Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 abstract description 36
- 230000000694 effects Effects 0.000 abstract description 23
- 230000008569 process Effects 0.000 abstract description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 9
- CVTZKFWZDBJAHE-UHFFFAOYSA-N [N].N Chemical class [N].N CVTZKFWZDBJAHE-UHFFFAOYSA-N 0.000 abstract description 9
- 239000011574 phosphorus Substances 0.000 abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 9
- 239000011593 sulfur Substances 0.000 abstract description 9
- 229910052717 sulfur Inorganic materials 0.000 abstract description 9
- 230000006378 damage Effects 0.000 abstract description 6
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- 239000001488 sodium phosphate Substances 0.000 description 3
- 229910000162 sodium phosphate Inorganic materials 0.000 description 3
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- 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
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- Life Sciences & Earth Sciences (AREA)
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- Engineering & Computer Science (AREA)
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Abstract
The application provides a machining wastewater treatment method and an industrial wastewater purification method. The machining wastewater treatment method comprises the following steps: adding a coagulant into the wastewater; filtering the wastewater by a filter screen; introducing the wastewater into an oil separation tank for filtering; introducing the wastewater into an ion exchange tank for reaction; and introducing the wastewater into an anaerobic tank for reaction. Compared with the traditional wastewater treatment process, the method has better treatment and purification effects, and the wastewater after purification treatment can be reused for partial mechanical processing and living, thereby being beneficial to improving the recovery and utilization rate of the wastewater; through multi-stage filtering and treatment, the load on wastewater treatment equipment can be reduced, the service life of the equipment can be prolonged, and various waste materials in wastewater can be better treated; sulfur, phosphorus and ammonia nitrogen compounds which have great harm to the environment are correspondingly treated by an ion exchange tank and an anaerobic tank, so that the pollution of the waste water to the environment is reduced.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a machining wastewater treatment method and an industrial wastewater purification method.
Background
In machining, a large amount of cutting work is required, the problems of chip adhesion, tool abrasion and the like are caused in the cutting process, and huge heat is generated, so that emulsion needs to be added during cutting to achieve the effects of cooling, chip removal and protection. As described above, in the machining, a large amount of industrial waste water containing the emulsion and the cutting waste is generated.
In order to accelerate the treatment efficiency of the machining wastewater and reduce the treatment cost of the wastewater, the machining wastewater is generally treated in a centralized manner, however, the traditional machining wastewater treatment process is laggard, so that the treatment effect of the machining wastewater is poor, and the recovery utilization rate is low; meanwhile, the centralized treatment has heavier requirements and burden on the wastewater treatment equipment, and the damage and the aging of the wastewater treatment equipment are easy to accelerate, so that the maintenance cost of the equipment is higher; in addition, the machining wastewater also contains harmful substances such as ammonia nitrogen and the like, and the traditional mechanical wastewater treatment process is difficult to thoroughly remove the harmful substances in the wastewater, so that the treated wastewater still has great harm to the environment.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a machining wastewater treatment method and an industrial wastewater purification method which can improve the wastewater treatment effect, reduce the cost of wastewater treatment and reduce the pollution of the treated wastewater to the environment.
The purpose of the invention is realized by the following technical scheme:
a machining wastewater treatment method comprises the following steps:
adding a coagulant into the wastewater;
filtering the wastewater by a filter screen;
introducing the wastewater into an oil separation tank for filtering;
introducing the wastewater into an ion exchange tank for reaction;
and introducing the wastewater into an anaerobic tank for reaction.
In one embodiment, before the step of adding the coagulant into the wastewater, the method further comprises the following steps:
and introducing the wastewater into a sedimentation tank for filtering.
In one embodiment, after the step of introducing the wastewater into a sedimentation tank for filtration and before the step of adding a coagulant into the wastewater, the method further comprises the following steps:
and guiding the wastewater into a sand filtering tower for filtering.
In one embodiment, after the step of introducing the wastewater into the oil separation tank for filtration and before the step of introducing the wastewater into the ion exchange tank for reaction, the method further comprises the following steps;
and (3) introducing the wastewater into a floating oil recovery machine for filtering.
In one embodiment, after the step of introducing the wastewater into the floating oil recovery machine for filtering and before the step of introducing the wastewater into the ion exchanger for reaction, the method further comprises the following steps:
and introducing the wastewater into an air floatation machine for filtering.
In one embodiment, after the step of introducing the wastewater into the air flotation machine for filtering and before the step of introducing the wastewater into the ion exchanger for reaction, the method further comprises the following steps:
adding a demulsifier to the wastewater;
and filtering the wastewater through a filter screen.
In one embodiment, the step of introducing the wastewater into an ion exchange tank for reaction is specifically as follows:
adding a sodium hydroxide solution to the ion exchange tank;
introducing the wastewater into the ion exchange tank for reaction;
and filtering the wastewater through a filter screen.
In one embodiment, the step of introducing the wastewater into the ion exchange tank for reaction is specifically as follows:
and introducing the wastewater into the ion exchange tank for reaction, and heating the wastewater and the sodium hydroxide solution in the ion exchange tank at the same time.
In one embodiment, after the step of introducing the wastewater into the ion exchange tank for reaction and before the step of introducing the wastewater into the anaerobic tank for reaction, the method further comprises the following steps:
adjusting the pH value of the wastewater.
A method of purifying industrial wastewater comprising the method of treating machining wastewater of any of the above embodiments.
Compared with the prior art, the invention has at least the following advantages:
the waste water is subjected to coagulation filtration, oil separation tank filtration, ion exchange tank reaction and anaerobic tank reaction in sequence, so that solid waste, oily waste, sulfur and phosphorus toxic compounds and ammonia nitrogen compounds in the machining waste water can be effectively removed, compared with the traditional waste water treatment process, the treatment and purification effect is better, the waste water after purification treatment can be reused for partial machining and living, and the recovery and utilization rate of the waste water is improved; through multi-stage filtering and treatment, the load on wastewater treatment equipment can be reduced, the service life of the equipment can be prolonged, various wastes in wastewater can be better treated, and the purification effect is better; sulfur, phosphorus and ammonia nitrogen compounds which have great harm to the environment are correspondingly treated by the ion exchange tank and the anaerobic tank, so that harmful substances can be touched more thoroughly, and the pollution of waste water to the environment is further reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow diagram of a method for treating machining wastewater in one embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
An embodiment of a method for treating machining wastewater includes the steps of: adding a coagulant into the wastewater; filtering the wastewater by a filter screen; introducing the wastewater into an oil separation tank for filtering; introducing the wastewater into an ion exchange tank for reaction; and introducing the wastewater into an anaerobic tank for reaction.
In order to better understand the mechanical processing wastewater treatment method of the present invention, the mechanical processing wastewater treatment method of the present invention is further explained below, and as shown in fig. 1, the mechanical processing wastewater treatment method of an embodiment includes some or all of the following steps:
s100: coagulant is added into the wastewater. The emulsion, the pickling solution and other waste water after mechanical processing are collected and then are stored uniformly so as to be convenient for centralized treatment, in this embodiment, the waste water after the mechanical processing contains a large amount of cutting scraps, the working environment of the cutting processing is harsh, and the waste water also contains a large amount of dust and impurities, so the waste water after the mechanical processing contains a large amount of solid waste, in this embodiment, a coagulant is added into the wastewater, and the coagulant forms a colloid after contacting with water, and the colloid adsorbs the solid waste in the wastewater to generate a bridging effect, so that the solid waste in the wastewater forms a plurality of waste groups, meanwhile, the waste groups are mutually adsorbed and connected after being contacted to form larger waste groups, therefore, the colloid formed by the solid waste coagulant in the wastewater is gathered, and the solid waste can be conveniently separated from the wastewater.
S200: and filtering the wastewater through a filter screen. In the last step, a large amount of solid waste in the waste water is acted on by the coagulant to form a large waste group, in the step, the waste water is filtered through the filter screen, specifically, the filter screen is arranged in the pipeline and guides the waste water to flow through the filter screen, and fine meshes on the filter screen intercept the large waste group in the waste water, so that the waste group is separated from the waste water, and thus, the solid waste in the waste water and the colloid formed by the coagulant can be well removed.
S300: and guiding the wastewater into an oil separation tank for filtering. In the last step, the solid waste in the wastewater is removed, and a large amount of emulsion and cooling oil are left in the wastewater, it can be understood that the density of oily substances such as emulsion and cooling oil is small, so that the oily waste in the wastewater can be removed by means of density difference, in this embodiment, the wastewater is introduced into an oil separation tank for filtration, an oil separation plate is vertically arranged in a circulation chamber of the oil separation tank, the bottom of the oil separation plate is at a certain distance from the bottom of the circulation chamber, the wastewater can circulate through a circulation area between the bottom of the oil separation plate and the bottom of the circulation chamber, and due to the low density of the oily waste in the wastewater, the oily waste can only float on the liquid level of the wastewater and can not flow through the circulation area between the bottom of the oil separation plate and the bottom of the circulation chamber, so the oily waste is separated by the oil separation plate, and the wastewater flows out from the oil separation tank, the oily waste amount is separated from the wastewater, namely the treatment of the oily waste of the wastewater is completed.
S400: and introducing the wastewater into an ion exchange tank for reaction. In the embodiment, the wastewater is introduced into an ion exchange tank for reaction, and the wastewater passing through the ion exchange tank reacts with a liquid medicine in the ion exchange tank, so that the sulfur and phosphorus compounds in the wastewater form precipitates, and the harmful substances such as sulfur, phosphorus and the like in the wastewater are removed.
S500: and introducing the wastewater into an anaerobic tank for reaction. The wastewater also contains ammonia nitrogen compounds, and after the wastewater containing ammonia nitrogen compounds is discharged into the water body, eutrophication of the water body is caused, and the water body is polluted.
In the embodiment, the waste water is subjected to coagulation filtration, oil separation tank filtration, ion exchange tank reaction and anaerobic tank reaction in sequence, so that solid waste, oily waste, sulfur and phosphorus toxic compounds and ammonia nitrogen compounds in the machining waste water can be effectively removed, compared with the traditional waste water treatment process, the treatment and purification effect is better, the waste water after purification treatment can be reused for partial machining and living, and the recovery and utilization rate of the waste water is improved; through multi-stage filtering and treatment, the load on wastewater treatment equipment can be reduced, the service life of the equipment can be prolonged, various wastes in wastewater can be better treated, and the purification effect is better; sulfur, phosphorus and ammonia nitrogen compounds which have great harm to the environment are correspondingly treated by the ion exchange tank and the anaerobic tank, so that harmful substances can be touched more thoroughly, and the pollution of waste water to the environment is further reduced.
It can be understood that the waste water of machining contains a large amount of cutting sweeps, and in waste water, the cutting sweeps is the great waste material of volume and quality, when filtering the cutting sweeps through the filter screen, need clear up the filter screen comparatively frequently, will lead to the treatment effeciency to waste water to descend. In order to solve the above problem, in one embodiment, the method further comprises the following steps before the step of adding the coagulant into the wastewater: and introducing the wastewater into a sedimentation tank for filtering. In this embodiment, before coagulation of solid waste in wastewater, wastewater is firstly introduced into a sedimentation tank for filtration, a water outlet of the sedimentation tank is arranged at a higher liquid level position, after wastewater is introduced into the sedimentation tank, the waste sinks into the bottom of the sedimentation tank because buoyancy of the wastewater to cutting scraps and some solid waste with larger mass is smaller than gravity of the solid waste, and the wastewater flowing out of the water outlet is separated from the waste such as the cutting scraps because the water outlet of the sedimentation tank is at a high liquid level position, so that a primary filtration effect can be achieved, and the waste with volume and mass in the wastewater is rapidly removed, so that the cleaning frequency of a filter screen is reduced, and the treatment efficiency of the wastewater is improved; meanwhile, as the solid waste scraps with larger mass in the wastewater are removed, the use amount of the coagulant can be effectively reduced in the subsequent coagulation process, and the effect of reducing the wastewater treatment cost is achieved.
It can be understood that although through the filtration of sedimentation tank, the great solid waste of quality in the waste water will be filtered, nevertheless because the density in the waste water is lower but the great solid waste of volume is not sunk, when leading to follow-up filter screen to filter waste water, still need comparatively frequent clearance to the filter screen. In order to solve the above problem, in one embodiment, after the step of introducing the wastewater into a sedimentation tank for filtration and before the step of adding a coagulant into the wastewater, the method further comprises the following steps: and guiding the wastewater into a sand filtering tower for filtering. In the embodiment, after the wastewater is filtered by the sedimentation tank and before a coagulant is added into the wastewater, the wastewater is introduced into the sand filtering tower for filtering, the sand filtering tower has a multi-layer physical filtering structure, the wastewater flowing through the sand filtering tower is filtered by the sand filtering tower, and only small solid waste is reserved in the wastewater flowing out of the sand filtering tower, so that the cleaning frequency of a filter screen is reduced, and the treatment efficiency of the wastewater is improved; meanwhile, as the solid waste scraps with larger volume in the wastewater are removed, the use amount of the coagulant can be effectively reduced in the subsequent coagulation process, and the effect of reducing the wastewater treatment cost is achieved.
In one embodiment, after the step of introducing the wastewater into the oil separation tank for filtration and before the step of introducing the wastewater into the ion exchange tank for reaction, the method further comprises the following steps; and (3) introducing the wastewater into a floating oil recovery machine for filtering. The waste water after the oil removal tank filters can detach a large amount of emulsified oil and cooling oil in the waste water, but the flowing waste water at the bottom of the oil removal tank possibly carries partial oily substances, namely the filtering effect of the oil removal tank is not thorough enough, the problem is not solved, in the embodiment, the waste water is filtered through the oil removal tank, the waste water is guided into the floating oil recovery machine to be filtered, the floating oil recovery machine comprises a lipophilic and hydrophobic recovery belt, the recovery belt continuously moves at the liquid level of the waste water, the oil at the liquid level of the waste water is adsorbed by the recovery belt of the floating oil recovery machine, and then the floating oil is taken out of the waste water, so that the oily waste materials in the waste water can be further filtered, and the treatment quality of the waste water is improved.
In one embodiment, after the step of introducing the wastewater into the floating oil recovery machine for filtering and before the step of introducing the wastewater into the ion exchanger for reaction, the method further comprises the following steps: and introducing the wastewater into an air floatation machine for filtering. In order to solve the above problems, in this embodiment, after the wastewater is filtered by the floating oil recovery machine, the wastewater is introduced into an air flotation machine for filtration, the air flotation machine can continuously produce bubbles in the bottom of the wastewater, the bubbles will contact with the oily waste suspended in the wastewater and fine impurities in the rising process, and the bubbles will drive the impurities to move together, so that the impurities float to the liquid level of the wastewater, and the impurities will be collected by an oil scraping mechanism of the air flotation machine after reaching the liquid level of the wastewater, so that the oily waste suspended in the wastewater is removed, thereby improving the purification treatment quality of the wastewater.
In one embodiment, after the step of introducing the wastewater into the air flotation machine for filtering and before the step of introducing the wastewater into the ion exchanger for reaction, the method further comprises the following steps: adding a demulsifier to the wastewater; and filtering the wastewater through a filter screen. In order to solve the problems, in the embodiment, after the wastewater is filtered by the air flotation machine, a demulsifier is added into the wastewater, after the demulsifier is added into the wastewater, the molecular repulsion force between the oily waste molecules can be reduced, so that the oily waste molecules are more easily combined, and meanwhile, the demulsifier forms colloid which adsorbs the oily waste molecules, so that the oily waste in the wastewater is mutually aggregated to form larger waste groups, and the combined waste groups are conveniently filtered; after the oily waste is demulsified, the waste water is filtered by the filter screen, the oily waste dissolved in the original waste water is removed, and the effect of improving the purification quality of the waste water is achieved.
In one embodiment, the step of introducing the wastewater into an ion exchange tank for reaction is specifically as follows: adding a sodium hydroxide solution to the ion exchange tank; introducing the wastewater into the ion exchange tank for reaction; and filtering the wastewater through a filter screen. In this embodiment, the sodium hydroxide solution has been held in the ion exchange pond, and after leading-in ion exchange pond with waste water, waste water will react with the sodium hydroxide solution, forms the precipitate of sodium phosphate, and the reaction is passed the back and is filtered waste water through the filter screen, and the sodium phosphate deposit just separates with waste water, so, just can take out the toxic compound that contains phosphorus in the waste water, still makes the separation process comparatively simple simultaneously, helps promoting waste water purification's efficiency.
In one embodiment, the step of introducing the wastewater into the ion exchange tank for reaction is specifically as follows: and introducing the wastewater into the ion exchange tank for reaction, and heating the wastewater and the sodium hydroxide solution in the ion exchange tank at the same time. In order to further accelerate the purification treatment efficiency of the wastewater, in the embodiment, when the wastewater is introduced into the ion exchange tank for reaction, the wastewater and the sodium hydroxide solution in the ion exchange tank are heated simultaneously, and the activity degree of molecules in the wastewater and the sodium hydroxide solution can be improved by heating, so that the chemical reaction rate of the wastewater and the sodium hydroxide solution is improved, sodium phosphate precipitate is generated more quickly, and the purpose of further improving the purification efficiency of the wastewater is achieved.
In one embodiment, after the step of introducing the wastewater into the ion exchange tank for reaction and before the step of introducing the wastewater into the anaerobic tank for reaction, the method further comprises the following steps: adjusting the pH value of the wastewater. Because the machining waste water is concentrated the back and is handled, its pH value is comparatively unstable, and after the sodium hydroxide solution reaction with the ion exchange pond, it is more difficult to control the pH value of waste water, and the microorganism in anaerobism pond can only be in the stock in suitable acid-base environment, if with the direct leading-in anaerobism pond of waste water, the microorganism in the anaerobism pond is probably killed, and then can't purify waste water, for solving above-mentioned problem, in this embodiment, before leading-in ion exchange pond with waste water, adjust the pH value of waste water earlier, make the pH value of waste water be in the scope that is fit for the microorganism survival in anaerobism pond, in order to prevent that the microorganism in the anaerobism pond is killed by waste water, and then ensure that the microorganism in anaerobism pond can absorb the ammonia nitrogen compound in the waste water high-efficiently, reach the effect of purifying waste water.
In one embodiment, after the step of introducing the wastewater into the anaerobic tank for reaction, the method further comprises the step of finely filtering the wastewater by a filtering device. After the wastewater is treated in multiple steps, most of the waste materials are removed, but the purity of the wastewater is still low, i.e. more fine particles still exist in the wastewater, so that the quality of the treated wastewater is still low. In this embodiment, after the wastewater is treated by the anaerobic tank, the wastewater is finely filtered, and during the fine filtering process, the wastewater sequentially passes through the plurality of filter element pieces, the filter meshes of the plurality of filter element pieces are gradually reduced, and fine particles in the wastewater are removed after the fine filtering, so that the purity of the treated wastewater is obviously improved.
In one embodiment, the filtering apparatus includes a filtering mechanism and a conveying mechanism, the filtering mechanism includes a filtering member and a plurality of filter elements, the filtering member defines a filtering cavity, a liquid inlet and a liquid outlet, the liquid inlet, the filtering cavity and the liquid outlet are sequentially connected, the liquid outlet has a higher level than the liquid inlet, and the plurality of filter elements are sequentially disposed in the filtering cavity. The conveying mechanism comprises a first pipe body and a liquid pump, the first pipe body is connected to the liquid inlet, and the liquid pump is connected with the first pipe body. In this embodiment, the filtering mechanism is used for finely filtering wastewater, and when filtering, wastewater flows into the filtering cavity from the liquid inlet of the filtering element, and flows through the plurality of filter elements of the filtering cavity in sequence, and finally flows out from the liquid outlet, and the plurality of filter elements can block fine particles in the wastewater, so as to improve the purity of the wastewater after treatment.
Because the level of liquid outlet is greater than the level of going into the liquid mouth, waste water can not flow to the liquid outlet from going into the liquid mouth spontaneously, so waste water carries through conveying mechanism, and the liquid pump is connected with first body, and the liquid pump is arranged in driving the waste water of first body and flows in from the income liquid mouth of filtering piece to be used for continuously driving waste water and flow through and filter the cavity, make waste water finally flow out from the liquid outlet, in order to accomplish the meticulous filtration of waste water. The horizontal height of the liquid outlet is higher than that of the liquid inlet, so that the flowing direction of the wastewater is opposite to the gravity direction, the kinetic energy of the wastewater can be reduced, fine particles in the wastewater can be in full contact with the filter element, and the filter element can better block and filter the fine particles; meanwhile, as the flow direction of the wastewater is opposite to the gravity direction, part of fine particles entering the filtering cavity sink under the action of gravity, and the filter element does not need to filter the fine particles sinking, so that the burden of the filter element is reduced and the replacement period of the filter element is prolonged; meanwhile, after the fine particles are filtered by the filter element, because the flowing direction of the wastewater is opposite to the gravity direction, the kinetic energy of the wastewater is lower, and after the fine particles filtered by the filter element lose the supporting force of the wastewater, part of the fine particles are separated from the filter element, so that the situation of blockage after the filter element is used for a long time can be improved, and the replacement period of the filter element can be prolonged.
In one embodiment, the filter cavity of the filter element is in the shape of a coil. In this embodiment, since the filtering cavity is shaped like a solenoid, when the wastewater flows in the filtering cavity, the filtering cavity in the shape of a solenoid can significantly increase the flow path of the wastewater, and the filtering cavity in the shape of a solenoid has a certain flow slowing effect on the water flow, so that the kinetic energy of the wastewater is further reduced, the power of the wastewater flow on the fine particles can be reduced, more fine particles cannot move upwards horizontally, and further the fine particles cannot reach the liquid outlet, which is helpful for improving the filtering effect of the filtering element; meanwhile, the spiral tubular filtering cavity increases the flow path of the wastewater, and more filter element installation setting points are arranged in the filtering cavity, so that more filter elements can be installed in the filtering cavity, and a better filtering effect on the wastewater is achieved.
In one embodiment, a sewage draining port is formed in the horizontal bottom of the filtering piece and communicated with the filtering cavity, the filtering mechanism further comprises a blocking piece, the blocking piece is detachably connected with the connecting piece, and the blocking piece covers the sewage draining port. The waste water flowing into the filter chamber, wherein the fine particles with larger mass are deposited at the bottom of the filter chamber, the fine particles flowing through the plurality of filter elements are attached to the filter elements, when the filtering mechanism is used for a long time, the fine particles on the bottom of the filtering cavity and the filter element need to be cleaned so as to ensure the normal use of the filtering mechanism, in the embodiment, the horizontal bottom of the filter element is provided with a sewage draining outlet communicated with the filter cavity, fine particles with larger mass are deposited above the sewage draining outlet, when the filtering mechanism is cleaned, clear water can be poured into the liquid outlet of the filtering piece, the blocking piece at the sewage discharge port is opened, the clear water sequentially passes through the plurality of filtering element pieces of the filtering cavity under the action of gravity, because the flow direction of the clear water is opposite to that of the waste water, the clear water can reversely flush the fine particles out of the filter element piece so as to complete the cleaning of the filter element piece; the clear water will move to the horizontal bottom of filtering cavity under the action of gravity, and final clear water will drive the filter element piece and the fine particle that filters piece bottom deposit together and discharge from the drain, and then accomplish the clearance to filtering mechanism. The drain is seted up through the bottom at filtering piece, and during clearance filtering mechanism, only need open the jam piece and pour the clear water in liquid outlet department, can accomplish the washing to filtering mechanism, help reducing filtering mechanism's the washing degree of difficulty and improve filtering mechanism's cleaning efficiency.
In one embodiment, the horizontal bottom of the filtering cavity is in a conical structure. The toper structure has the guide effect to the tiny particle at the end of sinking, can guide the tiny particle at the end of sinking to flow to the sewage department of filtering, when clearing up filtering mechanism, just can directly make most tiny particle discharge after opening the blocking piece, and simultaneously, when carrying out the clear water and washing, because the horizontal bottom of filter chamber body is the toper structure, the tiny particle that the clear water can take out the filter chamber body bottom better, avoid tiny particle to adhere to in the filter chamber body bottom, and then improved the cleaning performance to filtering mechanism.
In order to improve the filtering effect on the wastewater, in one embodiment, the conveying mechanism further includes a second pipe, a third pipe, and a three-way reversing valve, the liquid outlet, the second pipe, and the third pipe are all connected to the three-way reversing valve, and one end of the third pipe, which is far away from the three-way reversing valve, is connected to the first pipe. In the embodiment, after the wastewater flows out of the liquid outlet, the liquid outlet can be controlled to be communicated with the third pipe body through a three-way reversing valve, so that the wastewater which is subjected to one-time filtration flows back to the first pipe body again, and is filtered again under the driving of the liquid pump, and after multiple circulating flows, the wastewater is subjected to multiple times of filtration, so that the purification quality of the wastewater can be improved; after waste water loop filter accomplished, can control liquid outlet and second body intercommunication through controlling three-way reversing valve, the second body can be discharged the waste water of accomplishing the filtration to carry out the collection to the waste water after filtering.
The application also provides an industrial wastewater purification method, which comprises the machining wastewater treatment method in any embodiment. In one embodiment, as shown in FIG. 1, a method for treating machining wastewater comprises the steps of: adding a coagulant into the wastewater; filtering the wastewater by a filter screen; introducing the wastewater into an oil separation tank for filtering; introducing the wastewater into an ion exchange tank for reaction; and introducing the wastewater into an anaerobic tank for reaction.
In the embodiment, the waste water is subjected to coagulation filtration, oil separation tank filtration, ion exchange tank reaction and anaerobic tank reaction in sequence, so that solid waste, oily waste, sulfur and phosphorus toxic compounds and ammonia nitrogen compounds in the machining waste water can be effectively removed, compared with the traditional waste water treatment process, the treatment and purification effect is better, the waste water after purification treatment can be reused for partial machining and living, and the recovery and utilization rate of the waste water is improved; through multi-stage filtering and treatment, the load on wastewater treatment equipment can be reduced, the service life of the equipment can be prolonged, various wastes in wastewater can be better treated, and the purification effect is better; sulfur, phosphorus and ammonia nitrogen compounds which have great harm to the environment are correspondingly treated by the ion exchange tank and the anaerobic tank, so that harmful substances can be touched more thoroughly, and the pollution of waste water to the environment is further reduced.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A machining wastewater treatment method is characterized by comprising the following steps:
adding a coagulant into the wastewater;
filtering the wastewater by a filter screen;
introducing the wastewater into an oil separation tank for filtering;
introducing the wastewater into an ion exchange tank for reaction;
and introducing the wastewater into an anaerobic tank for reaction.
2. The method of treating machining waste water according to claim 1, further comprising, before the step of adding a coagulant to the waste water, the steps of:
and introducing the wastewater into a sedimentation tank for filtering.
3. The method of treating waste water from machining according to claim 2, further comprising the steps of, after said step of introducing said waste water into a settling tank for filtration and before said step of adding a coagulant to said waste water:
and guiding the wastewater into a sand filtering tower for filtering.
4. The method of treating machining waste water according to claim 1, further comprising the steps of, after the step of introducing the waste water into an oil separator for filtration and before the step of introducing the waste water into an ion exchange tank for reaction;
and (3) introducing the wastewater into a floating oil recovery machine for filtering.
5. The method of treating waste water from machining according to claim 4, further comprising the steps of, after the step of introducing the waste water into a floating oil recovering machine for filtration and before the step of introducing the waste water into an ion exchanger for reaction:
and introducing the wastewater into an air floatation machine for filtering.
6. The method of claim 5, further comprising the steps of, after the step of introducing the wastewater into the air flotation machine for filtration and before the step of introducing the wastewater into the ion exchanger for reaction:
adding a demulsifier to the wastewater;
and filtering the wastewater through a filter screen.
7. The method for treating machining wastewater according to claim 1, wherein the step of introducing the wastewater into an ion exchange tank for reaction comprises:
adding a sodium hydroxide solution to the ion exchange tank;
introducing the wastewater into the ion exchange tank for reaction;
and filtering the wastewater through a filter screen.
8. The method of claim 6, wherein the step of introducing the wastewater into the ion exchange tank for reaction comprises:
and introducing the wastewater into the ion exchange tank for reaction, and heating the wastewater and the sodium hydroxide solution in the ion exchange tank at the same time.
9. The method of claim 1, further comprising the steps of, after the step of introducing the wastewater into the ion exchange tank for reaction and before the step of introducing the wastewater into the anaerobic tank for reaction:
adjusting the pH value of the wastewater.
10. A method for purifying industrial wastewater, characterized in that the method for purifying industrial wastewater comprises the method for treating machining wastewater according to any one of claims 1 to 9.
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Application publication date: 20211214 |