CN112897672A - Solid vulcanizing agent, microetching copper-containing wastewater recycling treatment system and control method - Google Patents
Solid vulcanizing agent, microetching copper-containing wastewater recycling treatment system and control method Download PDFInfo
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Abstract
The invention discloses a solid vulcanizing agent, a microetching copper-containing wastewater recycling treatment system and a control method, wherein the raw material of the solid vulcanizing agent is one or the combination of two of pyrite and pure sphalerite, and the raw material is obtained by crushing, grinding, sieving, roasting at high temperature, cooling and sieving again; the treatment system comprises a reaction unit and a control unit, wherein the reaction unit comprises a water storage tank, a pretreatment tank, a reaction tank and a sedimentation tank which are sequentially connected, the pretreatment tank is connected with a first dosing mechanism, the reaction tank is connected with a second dosing mechanism, and the control unit comprises a pH online detection mechanism, a copper ion concentration online detection mechanism and a controller. The solid vulcanizing agent is obtained by taking pure pyrite and pure sphalerite as raw materials and modifying at high temperature, can realize the controllable release of sulfur ions, and the sulfur ions released under the acidic condition actively react with copper ions containing a complexing state, so that the effects of breaking complexing and removing heavy metal copper can be achieved, and the short-flow, safe and high-selectivity removal of electrolytic copper ions can be realized.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a solid vulcanizing agent, a microetching copper-containing wastewater recycling treatment system and a control method.
Background
The heavy metal wastewater generated in the whole country is about over 40 hundred million tons, which not only causes resource loss, but also causes serious environmental pollution. Electroplating wastewater is typical heavy metal polluted wastewater, and the electroplating wastewater becomes one of three pollution sources in the world at present, and is characterized in that: large discharge amount, complex components, high concentration, strong pollution and difficult biodegradation, contains various heavy metal ions, organic matters, suspended matters and the like. If the heavy metal wastewater is directly discharged without being effectively treated, the surrounding water environment is inevitably seriously polluted; causing blockage and corrosion of pipelines and riverways; after the natural water is received, the buffer action of the water body is destroyed, so that the water quality is deteriorated, the propagation and the survival of microorganisms in the water are inhibited or prevented, the self-cleaning capacity of the water body is reduced, and serious harm is caused to aquatic organisms and crops; various heavy metal ions in water cannot be degraded by microorganisms, and the heavy metal ions permeate soil to destroy crops by polluting rivers, lakes and seas, are adsorbed, accumulated and enriched in plants or animals, and then threaten human health through a food chain.
The electroplating wastewater also has certain resource attributes, and the resource utilization of metal ions in the wastewater has important significance. Copper-containing wastewater widely exists in the industrial production fields of electroplating, metallurgy and the like, heavy metal pollution, particularly heavy metal wastewater with high toxicity and strong stability, is more and more concerned by social circles and scientific research workers, and the discharge of the copper-containing wastewater is strictly controlled.
The common methods for treating the electroplating wastewater comprise: ion exchange method, chemical precipitation method, electrolytic method, coagulation method, adsorption method, reverse osmosis method, etc. The hydroxide precipitation method is widely applied to heavy metal wastewater treatment due to low cost, convenient operation and easy management, but the hydroxide precipitation method is often poor in removal effect on complex heavy metal wastewater, and the application of the hydroxide precipitation method is greatly limited. In addition, the existing electroplating wastewater treatment has low resource recovery utilization rate of copper ions, and cannot realize perfect copper-containing wastewater resource treatment, so that a large amount of copper resources are wasted.
Disclosure of Invention
The invention aims to provide a solid vulcanizing agent, a microetching copper-containing wastewater recycling treatment system and a control method, so as to solve the technical problems.
In order to achieve the purpose, the technical scheme of the invention is that
The invention provides a solid vulcanizing agent, wherein the raw material of the solid vulcanizing agent is one or two combinations of pure pyrite and pure sphalerite, and the solid vulcanizing agent is prepared by the following steps:
s1, crushing and grinding the raw materials, and then sieving to obtain particles a;
s2, roasting the particles a at high temperature, cooling and then sieving again to obtain the product.
On the basis of the technical scheme, the invention can be further improved as follows:
further, the sieving treatment in step S1 and the sieving treatment in step S2 both refer to collecting sieved particles after sieving with a 100-mesh sieve.
Further, the high-temperature roasting in the step S2 is roasting at 220-240 ℃ for 2 hours.
According to the solid vulcanizing agent, pyrite, sphalerite or a combination of pyrite and sphalerite is used as a raw material, pure pyrite and sphalerite are obtained by performing ore dressing, impurity removal and purification on natural ore, high-purity ferrous disulfide or zinc sulfide can be directly selected for substitution, the solid vulcanizing agent obtained by modifying the ore at high temperature can be used as a good sulfur source for supplement, the controllable release of sulfur ions can be realized, the sulfur ions released under the acidic condition actively react with copper ions containing a complexing state, the effects of breaking complexing and removing heavy metal copper can be achieved, and the short-flow, safe and high-selectivity removal of the copper ions in the electroplating microetching copper-containing wastewater can be realized.
The invention provides a microetching copper-containing wastewater recycling treatment system in a second aspect, which comprises a reaction unit and a control unit, the reaction unit comprises a water storage tank, a pretreatment tank, a reaction tank and a sedimentation tank which are connected in sequence, the pretreatment tank is connected with a first dosing mechanism for adding a pretreatment agent, the reaction tank is connected with a second dosing mechanism for adding the solid vulcanizing agent, the control unit comprises a pH on-line detection mechanism, a copper ion concentration on-line detection mechanism and a controller, the pH on-line detection mechanism and the copper ion concentration on-line detection mechanism are arranged in the water storage tank to detect the pH and the copper concentration of the wastewater, and feeding detection data back to the controller, wherein the controller controls the first dosing mechanism and the second dosing mechanism to work according to the detection data, and the controller is also used for controlling wastewater to transfer in the reaction unit.
On the basis of the technical scheme, the invention can be further improved as follows:
furthermore, the reaction unit further comprises a transfer tank arranged between the reaction tank and the sedimentation tank, the transfer tank is respectively connected with the reaction tank and the sedimentation tank, and the transfer tank is connected with the reaction tank through a reflux pump to realize reflux.
Furthermore, a stirring blade is arranged in the reaction tank.
Further, the pretreating agent is a sodium hydroxide solution or a dilute sulfuric acid solution.
The third aspect of the invention provides a control method of the microetching copper-containing wastewater recycling treatment system, which comprises the following steps:
s1 presetting outlet water copper concentration threshold C1Presetting the pH value of wastewater in the reaction tank to be a, presettingVolume V of treatment tank1Volume V of said reaction tank2And V is2Greater than V1；
S2 the pH on-line detection mechanism detects that the initial pH of the wastewater is b, and the copper ion concentration on-line detection mechanism detects that the initial concentration of copper in the wastewater is C0；
S3 controller V1The volume wastewater is transferred to the pretreatment tank by the water storage tank, and simultaneously, the first dosing mechanism is controlled to add the concentration C into the pretreatment tank3The sodium hydroxide solution or the dilute sulfuric acid solution, and the addition amount V of the sodium hydroxide solution or the dilute sulfuric acid solutionPreparation of＝|10-b-10-a|*V1/C3The pretreatment of the pretreatment tank is completed after t time;
s4, the controller controls the pretreated wastewater to be completely transferred to the reaction tank and synchronously controls the stirring blades to work, the controller controls the second dosing mechanism to add solid vulcanizing agent into the reaction tank, and the addition amount m of the solid vulcanizing agentSulfur＝Mr*1.25*(C0-Ksp/C1)*V2Wherein Ksp is the solubility product constant of copper sulfide, MrThe molecular weight of the solid vulcanizing agent is adopted, after the pretreated wastewater is completely transferred, the step S3 is repeated to transfer the wastewater from the water storage tank to the pretreatment tank, and the reaction is completed after t time passes in the reaction tank;
s5 the controller controls the reacted waste water to pass through the transfer pool and transfer to the sedimentation pool, meanwhile, the controller controls the reflux pump to work to reflux part of the reacted waste water to the reaction pool, and the volume V of the refluxed waste water3＝V2-V1After the wastewater in the reaction tank is transferred and refluxed, the step S4 is repeated;
s6 precipitating the reacted waste water in the precipitation tank, collecting the overflow liquid, and recovering the precipitate.
By adopting the scheme, the controller accurately controls the dosage of the hydroxide medicament according to the preset pH value of the reaction tank and the detected initial pH value of the wastewater, and accurately controls the dosage of the solid vulcanizing agent according to the preset outlet copper concentration threshold and the detected initial copper concentration of the wastewater, so that the high-efficiency and automatic treatment of the wastewater is ensured;
the controller controls the sequencing batch wastewater treatment, wastewater sequentially passes through the pretreatment tank, the reaction tank and the sedimentation tank, and the pretreatment tank and the reaction tank are in working states at each time period, so that the treatment efficiency is effectively improved;
the controller controls the part of the wastewater after reaction to flow back to the reaction tank for secondary reaction, on one hand, the pretreated wastewater is diluted, the copper treatment effect is improved, on the other hand, sufficient addition of a solid vulcanizing agent is also ensured, and the treatment effect is ensured.
On the basis of the technical scheme, the invention can be further improved as follows:
further, the outlet water copper concentration threshold value C in the step S11＝0.25mg/L。
By adopting the scheme, when 298K, the solubility product of CuS is Ksp which is 6.3 multiplied by 10-36When the CuS is completely precipitated, the concentration of copper ions in the solution is less than 10-5mol/L; meanwhile, referring to the relevant requirements of the discharge Standard of electroplating pollutants (GB 21900-2008), the mass concentration of copper ions in the discharged wastewater is less than 0.5mg/L, namely 0.0000078125 mol/L. On the basis of comprehensively considering the harmless treatment and near zero emission of the electroplating wastewater, a threshold value C is introduced1And (3) guiding the feeding of a solid vulcanizing agent to ensure that the treatment reaches the standard, and specifically carrying out online adjustment according to local environmental protection policy and emission requirements.
Further, the pH value of the wastewater in the reaction tank in the step S1 is 2.5-3.5.
By adopting the scheme, the effluent of the electroplating microetching copper-containing wastewater is generally strong in acidity and low in pH value and cannot adapt to the optimal reaction condition of a solid vulcanizing agent, so that the pH value is maintained between 2.5 and 3.5 by adding an alkaline substance NaOH in the reaction process.
Compared with the prior art, the invention has the beneficial effects that:
1. the solid vulcanizing agent is obtained by taking pure pyrite and pure sphalerite as raw materials and modifying the raw materials at high temperature, has low cost, can be used as a good sulfur source for supplement, can realize the controllable release of sulfur ions, and the sulfur ions released under the acidic condition actively react with copper ions containing a complexing state, so that the effects of breaking complexing and removing heavy metal copper can be achieved, and the short-flow, safe and high-selectivity removal of the copper ions in the electroplating microetching copper-containing wastewater can be realized;
2. the microetching copper-containing wastewater recycling treatment system disclosed by the invention has the advantages that the controller accurately controls the dosage of the hydroxide medicament according to the preset pH value of the reaction tank and the detected initial pH value of the wastewater, and accurately controls the dosage of the solid vulcanizing agent according to the preset outlet water copper concentration threshold and the detected initial copper concentration of the wastewater, so that the high-efficiency and automatic treatment of the wastewater is ensured, the removal rate of copper in the wastewater can reach more than 99% and the highest 99.45%, the concentration of copper ions in the treated wastewater reaches the national discharge standard, and the copper in a precipitation form can be recycled;
3. the treatment system carries out sequencing batch wastewater treatment under the control of the controller, wastewater sequentially passes through the pretreatment tank, the reaction tank and the sedimentation tank, and the pretreatment tank and the reaction tank are in working states at each time period, so that the treatment efficiency is effectively improved;
4. the controller controls part of reacted wastewater to flow back to the reaction tank for secondary reaction, on one hand, the pretreated wastewater is diluted, the copper treatment effect is improved, on the other hand, sufficient addition of a solid vulcanizing agent is also ensured, and the treatment effect is ensured.
Drawings
Fig. 1 is a schematic structural view of embodiment 2 of the present invention.
Shown in the figure:
1. a water storage tank;
2. a pretreatment tank;
3. a reaction tank;
4. a transfer pool;
5. a sedimentation tank;
6. a first dosing mechanism;
7. a second dosing mechanism;
8. a stirring blade;
9. a reflux pump.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Example 1
The method is characterized in that pure pyrite is used as a raw material to prepare a solid vulcanizing agent, the pure pyrite is obtained by carrying out mineral separation, impurity removal and purification on natural pyrite, and the method comprises the following specific steps:
s1, crushing and grinding the pyrite, and then sieving the pyrite by using a 100-mesh sieve to collect sieved particles to obtain pyrite particles;
s2 roasting the pyrite granules obtained in the step S1 at 230 ℃ for 2h, cooling, sieving by using a 100-mesh sieve again, and collecting sieved granules to obtain the solid vulcanizing agent.
Example 2
The method is characterized in that pure sphalerite is used as a raw material to prepare a solid vulcanizing agent, and the pure sphalerite is obtained by carrying out ore dressing, impurity removal and purification on natural sphalerite, and comprises the following specific steps:
s1, crushing and grinding the sphalerite, and then sieving by using a 100-mesh sieve to collect sieved particles to obtain sphalerite particles;
s2, roasting the sphalerite particles obtained in the step S1 at 230 ℃ for 2 hours, cooling, sieving by using a 100-mesh sieve again, and collecting sieved particles to obtain the solid vulcanizing agent.
Example 3
The method adopts the combination of pure pyrite and pure sphalerite as raw materials to prepare the solid vulcanizing agent, and comprises the following steps:
s1, mixing the pure pyrite and the pure sphalerite according to the weight ratio of 1: 1, crushing and grinding, and then sieving by using a 100-mesh sieve to collect sieved particles to obtain particles a;
s2, roasting the granules a obtained in the step S1 at 230 ℃ for 2h, cooling, sieving by using a 100-mesh sieve again, and collecting sieved granules to obtain the solid vulcanizing agent.
Example 4
The embodiment provides a microetching copper-containing waste water resourceful treatment system, including reaction unit and the control unit, the reaction unit is including reservoir 1, preliminary treatment pond 2, reaction tank 3, transfer pond 4 and sedimentation tank 5 that connect gradually, through the water pump intercommunication between the adjacent cell body, transfer pond 4 still is connected with reaction tank 3 through backwash pump 9 and realizes the backward flow.
Stirring blades 8 are arranged in the reaction tank 3 and used for improving the reaction efficiency.
Wherein the volume V of the pretreatment tank 2150L, volume V of reaction tank 32＝70L。
The pretreatment tank 2 is connected with a first dosing mechanism 6 for adding a pretreatment agent, and the reaction tank 3 is connected with a second dosing mechanism 7 for adding a solid vulcanizing agent.
Specifically, the first dosing mechanism 6 and the second dosing mechanism 7 can utilize gravity and valve control to realize dosing, and can also carry out quantitative dosing through devices such as a screw feeder and a feed pump, which are the prior art in the field.
The control unit (not shown in the figure) comprises a pH online detection mechanism, a copper ion concentration online detection mechanism and a controller.
The pH on-line detection mechanism and the copper ion concentration on-line detection mechanism are arranged in the water storage tank 1 to detect the pH and the copper concentration of the wastewater, and the detection data is fed back to the controller.
The controller controls the first dosing mechanism 6 and the second dosing mechanism 7 to work according to the detection data, and is also used for controlling the wastewater to transfer in the reaction unit.
Specifically, the pH on-line detection mechanism adopts a fixed high-precision pH detection pen, and the copper ion concentration on-line detection mechanism adopts a spectrophotometry method to measure the absorbance of the waste liquid and compares the absorbance with a standard copper concentration curve to realize the detection of the total copper concentration, which is uniform in the prior art in the field.
The controller adopts a PLC controller, is electrically connected with the pH on-line detection mechanism, the copper ion concentration on-line detection mechanism, the water pump and the reflux pump 9, and processes detection data and controls the system in real time.
The specific control method of the system is as follows:
s1 presetting outlet water copper concentration threshold C1Presetting the pH value of the wastewater in the reaction tank 3 as a when the pH value is 0.25 mg/L;
s2pH on-line detection mechanism detects that initial pH of waste water is b, and copper ion concentration on-line detection mechanism detects that initial concentration of copper in waste water is C0；
S3 controller control V1The volume wastewater is transferred from the water storage tank 1 to the pretreatment tank 2, and simultaneously the first dosing mechanism 6 is controlled to add the concentration C into the pretreatment tank 23Sodium hydroxide solution of (4), the amount of sodium hydroxide solution added VPreparation of＝|10-b-10-a|*V1/C3The pretreatment is completed after 10min in the pretreatment tank 2;
the S4 controller controls the pretreated wastewater to be completely transferred to the reaction tank 3, synchronously controls the stirring blades 8 to work, controls the second dosing mechanism 7 to add solid vulcanizing agent into the reaction tank 3, and controls the addition amount m of the solid vulcanizing agentSulfur＝Mr*1.25*(C0-Ksp/C1)*V2Wherein Ksp is the solubility product constant of copper sulfide, and the solubility product constant of copper sulfide is 6.3 multiplied by 10 when 298K is selected-36，MrMolecular weight of the solid vulcanizing agent; when the pretreated wastewater is completely transferred, the step S3 is repeated to transfer the wastewater from the water storage tank 1 to the pretreatment tank 2, and the reaction in the reaction tank 3 is completed after 10 min;
s5 the controller controls the reacted waste water to transfer to the sedimentation tank 5 through the transfer tank 4, meanwhile the controller controls the reflux pump 9 to work to reflux part of the reacted waste water to the reaction tank 3, and the volume V of the refluxed waste water3After the wastewater in the reaction tank 3 is transferred and refluxed, the step S4 is repeated when 20L is obtained;
s6 precipitating the reacted waste water in the sedimentation tank 5, collecting the overflow liquid and recovering the precipitate.
The treatment effect of this example is illustrated by a specific wastewater treatment process as follows:
and selecting wastewater with the original pH value of 1.0 and the total copper concentration of 58.33mg/L to perform three treatment experiments, wherein the preset pH values of the wastewater in the reaction tank 3 of the three treatment experiments are 2.5, 3 and 3.5 respectively, and the solid vulcanizing agents prepared in example 1, example 2 and example 3 are added in the three treatment experiments respectively.
Calculating the addition amount V of 0.1mol/L sodium hydroxide solution of three treatment experiments3Addition amount m of solid vulcanizing agentSulfurAnd detecting the copper concentration of the water and calculating the copper removal rate to obtain the following table. Wherein the molecular weight of the solid sulfiding agent of example 1 is 120, the molecular weight of the solid sulfiding agent of example 2 is 97.44, and the molecular weight of the solid sulfiding agent of example 3 is 108.72.
As shown by data in the table, the treatment system of the embodiment can efficiently treat the microetching copper-containing wastewater by adopting the high-activity solid vulcanizing agent and the automatic control system, the copper removal rate is more than 99%, wherein the solid vulcanizing agent can effectively achieve the effects of breaking complexation and removing heavy metal copper, and the short-flow, safe and high-selectivity removal of copper ions in the electroplating microetching copper-containing wastewater is realized.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
1. The solid vulcanizing agent is characterized in that the raw material of the solid vulcanizing agent is one or two of pure pyrite and pure sphalerite, and is prepared by the following steps:
s1, crushing and grinding the raw materials, and then sieving to obtain particles a;
s2, roasting the particles a at high temperature, cooling and then sieving again to obtain the product.
2. The solid vulcanizing agent according to claim 1, wherein the sieving treatment in the step S1 and the sieving treatment in the step S2 are performed by collecting sieved particles after sieving with a 100-mesh sieve.
3. The solid vulcanizing agent according to claim 1, wherein the high temperature roasting in the step S2 is carried out at 220-240 ℃ for 2 h.
4. A microetching copper-containing wastewater recycling treatment system is characterized by comprising a reaction unit and a control unit, the reaction unit comprises a water storage tank, a pretreatment tank, a reaction tank and a sedimentation tank which are connected in sequence, the pretreatment tank is connected with a first dosing mechanism for adding a pretreatment agent, the reaction tank is connected with a second dosing mechanism for adding the solid vulcanizing agent according to any one of claims 1 to 3, the control unit comprises a pH on-line detection mechanism, a copper ion concentration on-line detection mechanism and a controller, the pH on-line detection mechanism and the copper ion concentration on-line detection mechanism are arranged in the water storage tank to detect the pH and the copper concentration of the wastewater, and feeding detection data back to the controller, wherein the controller controls the first dosing mechanism and the second dosing mechanism to work according to the detection data, and the controller is also used for controlling wastewater to transfer in the reaction unit.
5. The microetching copper-containing wastewater resource treatment system according to claim 4, wherein the reaction unit further comprises a transfer tank arranged between the reaction tank and the sedimentation tank, the transfer tank is respectively connected with the reaction tank and the sedimentation tank, and the transfer tank is further connected with the reaction tank through a reflux pump to realize reflux.
6. The microetching copper-containing wastewater resource treatment system according to claim 4, wherein stirring blades are arranged in the reaction tank.
7. The microetching copper-containing wastewater resource treatment system according to claim 4, wherein the pretreatment agent is a sodium hydroxide solution or a dilute sulfuric acid solution.
8. The control method of the microetching copper-containing wastewater resource treatment system according to any one of claims 1 to 7, characterized by comprising the steps of:
s1 presetting outlet water copper concentration threshold C1Presetting the pH value of the wastewater in the reaction tank as a, presetting the volume V of the pretreatment tank1Volume V of said reaction tank2And V is2Greater than V1；
S2 the pH on-line detection mechanism detects that the initial pH of the wastewater is b, and the copper ion concentration on-line detection mechanism detects that the initial pH of the wastewater is bInitial concentration of copper is C0；
S3 controller V1The volume wastewater is transferred to the pretreatment tank by the water storage tank, and simultaneously, the first dosing mechanism is controlled to add the concentration C into the pretreatment tank3The sodium hydroxide solution or the dilute sulfuric acid solution, and the addition amount V of the sodium hydroxide solution or the dilute sulfuric acid solutionPreparation of＝|10-b-10-a|*V1/C3The pretreatment of the pretreatment tank is completed after t time;
s4, the controller controls the pretreated wastewater to be completely transferred to the reaction tank and synchronously controls the stirring blades to work, the controller controls the second dosing mechanism to add solid vulcanizing agent into the reaction tank, and the addition amount m of the solid vulcanizing agentSulfur＝Mr*1.25*(C0-Ksp/C1)*V2Wherein Ksp is the solubility product constant of copper sulfide, MrThe molecular weight of the solid vulcanizing agent is adopted, after the pretreated wastewater is completely transferred, the step S3 is repeated to transfer the wastewater from the water storage tank to the pretreatment tank, and the reaction is completed after t time passes in the reaction tank;
s5 the controller controls the reacted waste water to pass through the transfer pool and transfer to the sedimentation pool, meanwhile, the controller controls the reflux pump to work to reflux part of the reacted waste water to the reaction pool, and the volume V of the refluxed waste water3＝V2-V1After the wastewater in the reaction tank is transferred and refluxed, the step S4 is repeated;
s6 precipitating the reacted waste water in the precipitation tank, collecting the overflow liquid, and recovering the precipitate.
9. The method for controlling the resourceful treatment system of microetching copper-containing wastewater according to claim 8, wherein the outlet water copper concentration threshold C in the step S11＝0.25mg/L。
10. The control method of the microetching copper-containing wastewater resource treatment system according to claim 8, wherein the pH value of the wastewater in the reaction tank in the step S1 is 2.5 to 3.5.
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