CN114132999A - Method for treating printing and dyeing wastewater by activating persulfate through anode electrochemistry - Google Patents

Method for treating printing and dyeing wastewater by activating persulfate through anode electrochemistry Download PDF

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CN114132999A
CN114132999A CN202111417752.4A CN202111417752A CN114132999A CN 114132999 A CN114132999 A CN 114132999A CN 202111417752 A CN202111417752 A CN 202111417752A CN 114132999 A CN114132999 A CN 114132999A
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persulfate
anode
wastewater
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anode chamber
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CN114132999B (en
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李�浩
闫馨梅
翁佳琦
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Ningbo Polytechnic
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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
    • 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
    • C02F2101/30—Organic compounds
    • C02F2101/308—Dyes; Colorants; Fluorescent agents
    • 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
    • C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
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  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
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Abstract

The invention belongs to the field of wastewater treatment, and particularly relates to a method for treating printing and dyeing wastewater by using anodic electrochemical activation persulfate. The processing method comprises the following steps: s1, adding a certain amount of printing and dyeing wastewater to be treated into the anode chamber of the electrochemical reactor, and adding deionized water with the same volume into the cathode chamber; s2, adding persulfate with specific concentration into the anode chamber, and adding Na with specific concentration2SO4As a supporting electrolyte; adding Na with equal concentration into cathode chamber2SO4A supporting electrolyte; s3, IrO is filled in the anode chamber2a/Ti electrode, a cathode chamber is filled with a stainless steel electrode with the same area, the power supply of the electrochemical reactor is connected, and the current and the waste water in the reaction process are monitoredA color change; and S4, opening a reactor anode chamber drainage system after the reaction is finished, and discharging the treated wastewater. IrO in contrast to cathodic electroactive2The electro-activated persulfate of the Ti anode has stronger oxidizing capability and higher treatment efficiency.

Description

Method for treating printing and dyeing wastewater by activating persulfate through anode electrochemistry
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a method for treating printing and dyeing wastewater by using persulfate to generate active species with strong oxidizing property in situ.
Background
In the textile printing and dyeing industry, azo dyes become one of the most widely used synthetic dyes due to the advantages of simple production process, low production cost, strong dyeing capability and the like. However, azo dyes are of various types, complex in structure and difficult to biodegrade, and thus become one of the important sources of environmental pollution, especially water pollution. Among the various azo dye treatment methods, physical treatment methods such as adsorption, membrane separation and the like can only realize phase transfer of pollutants, which can cause other pollution problems. Although the biological treatment is low in cost and easy to control, the treatment capacity is limited, and the treatment effect on organic pollutants difficult to degrade is particularly poor. The chemical treatment is to change the property of the dye through chemical reaction, realize the complete mineralization of the pollutants and is more suitable for removing the organic pollutants which are difficult to degrade.
The persulfate advanced oxidation technology is a novel advanced oxidation technology, and sulfate radicals (SO) are utilized4 ·–) Oxidizing to remove organic pollutants. However, persulfate alone has low reactivity with organic pollutants and needs to be enhanced in reaction with organic pollutants by activating persulfate. In recent years, various scientific researchers at home and abroad activate persulfate by adopting different ways such as ultrasonic waves and other external energy, transition metals, carbon materials and the like, so that the activity of the persulfate for treating organic pollutant wastewater is effectively improved. But the method for adding the capacity has more complex equipment operation and large energy consumption; during the activation process of the transition metal, a large amount of metal precipitates can be generated due to consumption and dissolution of metal ions; the problems of long-term stability and the like of the carbon material limit the large-scale application of the persulfate advanced oxidation technology.
The electrochemical oxidation technology takes 'electrons' as a reaction reagent, has the advantages of mild reaction conditions, strong controllability, high energy efficiency, simple equipment operation, small occupied area, low cost and easy realization of automation, and is one of the commonly used technologies in the field of organic wastewater treatment. Combines the electrochemical oxidation technology with the persulfate advanced oxidation technology, utilizes the electrochemistry to activate the persulfate, and utilizes the oxidation of the electrooxidation and the persulfate to realize the oxidation,the method is a cheap, green and efficient persulfate activation technology. It is believed that electrochemical activation of persulfate requires an activator to transfer electrons to persulfate molecules to form SO4 ·–. The cathode loses electrons during the electrolysis process, and the anode gains electrons, so that the current research focuses more on cathode electric activation, and relatively few research reports on anode electric activation. However, it is worth noting that during electrolysis, persulfate salts in the form of anions are more easily enriched on the surface of the anode, and thus in theory, the anode electrical activation can generate more active species with stronger organic pollutant degradation activity.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a method for treating printing and dyeing wastewater by electrochemically activating persulfate through an anode, and IrO is utilized in the method2the/Ti dimensionally stable anode electrochemically activates persulfate, and can realize efficient and deep removal of refractory organic pollutants in printing and dyeing wastewater.
The above object of the present invention can be achieved by the following technical solutions: a method for treating printing and dyeing wastewater by electro-chemically activating persulfate through an anode specifically comprises the following steps:
s1, adding a certain amount of printing and dyeing wastewater to be treated into the anode chamber of the electrochemical reactor, and adding deionized water with the same volume into the cathode chamber;
s2, adding persulfate with specific concentration into the anode chamber, and adding Na with specific concentration2SO4As a supporting electrolyte; adding Na with equal concentration into cathode chamber2SO4A supporting electrolyte;
s3, installing a dimensionally stable anode in the anode chamber, installing stainless steel electrodes with the same area in the cathode chamber, switching on a power supply of the electrochemical reactor, and monitoring the current and the color change of the wastewater in the reaction process;
and S4, opening a reactor anode chamber drainage system after the reaction is finished, and discharging the treated wastewater.
Preferably, the electrochemical reactor in step S1 is a two-chamber reactor, and the anode chamber and the cathode chamber are separated by a proton exchange membrane, or the anode chamber and the cathode chamber are connected by a salt bridge.
Preferably, the persulfate in step S2 is typically a peroxodisulfate salt, such as Na2S2O8The concentration of the persulfate is controlled to be 1-5 mmol/L.
Preferably, the supporting electrolyte Na in step S22SO4The concentration of (B) is controlled to be 0.5-1 mol/L.
Preferably, the dimensionally stable anode in step S3 is IrO2/Ti、RuO2/Ti electrode or SnO2a/Ti electrode.
Preferably, the current density is controlled to be 30-70mA/cm after the electrochemical reactor is switched on2The voltage does not exceed 20V and can pass through Na2SO4The addition amount of the catalyst is used for adjusting the conductivity of the wastewater and controlling the voltage.
More preferably, the degradation of the printing and dyeing wastewater can be enhanced by adding electrolyte A, wherein the electrolyte A is NaCl and NaNO3、Na3PO4Or Na2CO3One or more of them.
Further preferably, the concentration of sodium chloride in the anode compartment is 0.5 to 5mmol/L, preferably 1 to 5mmol/L, more preferably 5 mmol/L.
Further preferably, the anode is NaNO3The concentration of the electrolyte is 5-20mmol/L, preferably 10-20mmol/L, more preferably 20mmol/L
Preferably, the wastewater treated in the step S4 can achieve a decolorization rate of 100%.
Compared with the prior art, the invention has the following beneficial effects:
(1) the electrochemical persulfate activation is adopted, so that the method is a green, high-efficiency and low-consumption persulfate activation technology;
(2) compared with cathode electric activation, the invention uses IrO2The Ti anode electrically activates persulfate, so that the oxidation capacity is higher, and the sewage treatment efficiency is higher;
(3) the method has the advantages of simple operation, easy control and high treatment efficiency, and can pass NaCl and NaNO3The supporting electrolyte further enhances the oxidizing ability,the treatment time is shortened, and the treatment energy consumption is reduced.
(4) The influence of adding different electrolytes in the anode chamber on the electrolytic oxidation capacity is investigated and compared, and the addition of the sodium chloride electrolyte has a good promoting effect.
(5) In the electroactive sodium persulfate system, acid orange is subjected to oxidative degradation, and the oxidation effect of the acid orange does not depend on free radical oxidation or direct electron transfer oxidation, but mainly depends on non-free radical oxidation generated by a certain transition state structure formed in the oxidation process of persulfate.
Drawings
FIG. 1 is a schematic diagram of an anodic electrochemical persulfate activation reaction apparatus;
FIG. 2 shows the effect of different ways of treating waste water of acid orange 74;
FIG. 3 is a graph showing the effect of free radical scavenger methanol on anodic electroactive persulfate treatment of acid orange 74 wastewater;
FIG. 4 shows IrO2a/Ti anode electroactive persulfate cyclic voltammetry curve chart;
FIG. 5 is a graph showing the effect of NaCl concentration on anodic electroactive persulfate treatment of acid orange 74 wastewater;
FIG. 6 shows NaNO3The influence of the concentration on the treatment of acid orange 74 wastewater by electroactivating persulfate at the anode;
FIG. 7 shows Na3PO4The influence of the concentration on the treatment of acid orange 74 wastewater by electroactivating persulfate at the anode;
FIG. 8 shows Na2CO3The influence of the concentration on the treatment of acid orange 74 wastewater by electroactivating persulfate at the anode;
FIG. 9 shows NaCl and NaNO3Synergistic effect on anodic electroactive persulfate treatment of acid orange 74 wastewater.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention. In addition, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
The embodiment of the invention considers IrO2Electro-activation of sodium persulfate on the/Ti anode degraded 200mL of Acid Orange 74(Acid Orange 74, AO 74) at a concentration of 50 mg/L.
Example 1
A method for degrading AO 74 wastewater specifically comprises the following steps:
s1, adding 200mL of AO 74 wastewater with the concentration of 50mg/L into an anode chamber of an electrochemical reactor, and adding deionized water with the same volume into a cathode chamber;
s2, adding 3mmol/L sodium persulfate into the anode chamber, and adding 0.5mol/L Na2SO4As a supporting electrolyte; an equal concentration of Na2SO4 supporting electrolyte was added to the cathode compartment.
S3, IrO is filled in the anode chamber2A Ti electrode, a stainless steel electrode with the same area is arranged in the cathode chamber, the power supply of the electrochemical reactor is switched on, and the current is set to be 60mA/cm2In the reaction process, the cathode chamber and the anode chamber are stirred at the speed of 400 rmp; monitoring the current and the color change of the wastewater in the reaction process;
and S4, after 3 hours of treatment, closing a power switch, opening a reactor anode chamber drainage system, and discharging the treated wastewater.
Example 2
The only difference from example 1 was that sodium persulfate was not added to the anode compartment.
Example 3
The only difference from example 1 is that the electrochemical reactor power supply was not switched on.
Example 4
The only difference from example 1 is that the positive and negative poles of the electrochemical reactor power supply are interchanged, IrO2the/Ti electrode is connected with the negative electrode of the power supply, and the stainless steel electrode is connected with the positive electrode of the power supply.
Example 5
The only difference from example 1 is that IrO is added2Replacement of the/Ti electrode by RuO2a/Ti electrode.
Example 6
The only difference from example 1 is that IrO is added2Changing the/Ti electrode to SnO2a/Ti electrode.
Examples 1-6 are primarily a comparison of sodium persulfate oxidation alone, electrochemical oxidation, cathodic electroactive sodium persulfate, and anodic electroactive sodium persulfate (including IrO)2、RuO2And SnO2Equal different electrodes) degradation efficiency of four different ways of treating AO 74 wastewater as shown in fig. 2. As can be seen in FIG. 2, sodium persulfate alone has little oxidizing power to AO 74, indicating that persulfate must be activated to be oxidizing. The degradation of AO 74 can be promoted by cathodic electroactive sodium persulfate and anodic electroactive sodium persulfate, and after 3h degradation treatment, electrochemical oxidation, cathodic electroactive and IrO2The removal rates of the electrode anode electroactive to AO 74 were 61.2%, 66.5%, and 81.8%, respectively. Especially, compared with the electrochemical oxidation, the removal rate of pollutants is improved by 33.7% in the process of anodic electroactive sodium persulfate. Proves that the anode electroactive sodium persulfate process has higher oxidation capacity and higher pollutant removal efficiency. In contrast to IrO2、RuO2And SnO2The degradation effects of three different dimensionally stable anode electroactive persulfates are not obvious, and SnO2The electrode effect is slightly good, and the removal rate is 84.5% after 3h degradation, so that the dimensionally stable anode is suitable for the process of electrically activating persulfate by the anode.
Example 7
A method for treating AO 74 wastewater by using sodium persulfate through anodic electro-activation specifically comprises the following steps:
s1, adding 200mL of AO 74 wastewater with the concentration of 50mg/L into an anode chamber of an electrochemical reactor, and adding deionized water with the same volume into a cathode chamber;
s2, adding 3mmol/L sodium persulfate into the anode chamber, and adding 0.5mol/L Na2SO4As a supporting electrolyte; adding Na with equal concentration into cathode chamber2SO4Supporting the electrolyte.
S3, IrO is filled in the anode chamber2a/Ti electrode, stainless steel electrodes with the same area are arranged in the cathode chamber, the power supply of the electrochemical reactor is connected,the current was set to 60mA/cm2In the reaction process, the cathode chamber and the anode chamber are stirred at the speed of 400 rmp; monitoring the current and the color change of the wastewater in the reaction process;
and S4, after 3 hours of treatment, closing a power switch, opening a reactor anode chamber drainage system, and discharging the treated wastewater.
Example 8
The only difference from example 7 is that 2mmol/L methanol was added to the anode compartment.
Example 9
The only difference from example 7 is that 5mmol/L methanol was added to the anode compartment.
Example 10
The only difference from example 7 is that 10mmol/L methanol was added to the anode compartment.
Examples 7-10 were conducted to examine primarily the effect of methanol on the anodic electroactive sodium persulfate degradation of AO 74 wastewater, as shown in FIG. 3. In free radical oxidation, methanol is often used to capture hydroxyl radicals (. OH) and sulfate radicals (SO)4 ·–). As can be seen from FIG. 3, the addition of 2-10mmol/L methanol did not have a significant effect on the degradation efficiency of the anode electroactive sodium persulfate to degrade AO 74 wastewater. This indicates that IrO2The oxidation of the/Ti anode electroactive sodium persulfate is not dependent on free radical oxidation.
Example 11
A method for treating AO 74 wastewater by using sodium persulfate through anodic electro-activation specifically comprises the following steps:
s1, adding 200mL of AO 74 wastewater with the concentration of 50mg/L into an anode chamber of an electrochemical reactor, and adding deionized water with the same volume into a cathode chamber;
s2, adding 3mmol/L sodium persulfate into the anode chamber, and adding 0.5mol/L Na2SO4As a supporting electrolyte; adding Na with equal concentration into cathode chamber2SO4Supporting the electrolyte.
S3, IrO is filled in the anode chamber2the/Ti working electrode is characterized in that a counter electrode Pt electrode is arranged in an anode chamber, and a reference electrode Ag/AgCl electrode is arranged in a cathode chamber. Switching on the power supply of the electrochemical workstation to measure the cyclic voltammetryCurve line.
Example 12
The only difference from example 11 is that no acid orange wastewater was added to the anode compartment.
Example 13
The only difference from example 11 was that sodium persulfate was not added to the anode compartment.
Example 14
The only difference from example 11 is that the acid orange wastewater and sodium persulfate were not added to the anode compartment.
Examples 11-14 the electron transfer process of the anodic electroactive persulfate system was studied primarily using cyclic voltammetry, as shown in figure 4. When 3mmol/L sodium persulfate or 50mg/L acid orange is added alone, the current output is not obviously changed (see the inset for details), and the electron transfer process on the surface of the anode is not generated. However, when sodium persulfate and acid orange are added simultaneously, the current output is increased, which indicates that in the electroactive sodium persulfate system, acid orange is subjected to oxidative degradation, and the oxidation action of the acid orange does not depend on free radical oxidation or direct electron transfer oxidation, but mainly depends on non-free radical oxidation generated by a certain transition state structure formed by the oxidation process of persulfate.
Example 15
A method for treating AO 74 wastewater by using sodium persulfate through anodic electro-activation specifically comprises the following steps:
s1, adding 200mL of AO 74 wastewater with the concentration of 50mg/L into an anode chamber of an electrochemical reactor, and adding deionized water with the same volume into a cathode chamber;
s2, adding 3mmol/L sodium persulfate into the anode chamber, and adding 0.5mol/L Na2SO4As a supporting electrolyte; adding Na with equal concentration into cathode chamber2SO4Supporting the electrolyte.
S3, IrO is filled in the anode chamber2A Ti electrode, a stainless steel electrode with the same area is arranged in the cathode chamber, the power supply of the electrochemical reactor is switched on, and the current is set to be 60mA/cm2In the reaction process, the cathode chamber and the anode chamber are stirred at the speed of 400 rmp; monitoring the current and the color change of the wastewater in the reaction process;
and S4, after 3 hours of treatment, closing a power switch, opening a reactor anode chamber drainage system, and discharging the treated wastewater.
Example 16
The only difference from example 15 is that 0.5mmol/L NaCl was added to the anode compartment.
Example 17
The only difference from example 15 is that 1mmol/L sodium chloride was added to the anode compartment.
Example 18
The only difference from example 13 is that 5mmol/L sodium chloride was added to the anode compartment.
Examples 15-18 were conducted to examine primarily the effect of sodium chloride on the anodic electroactive sodium persulfate degradation of AO 74 wastewater, as shown in FIG. 5. It can be seen from FIG. 5 that sodium chloride greatly enhances the oxidation efficiency of the electroactive sodium persulfate. After 0.5, 1 and 5mmol/L of sodium chloride is added, the AO 74 can be completely removed within 80min, 40min and 10min respectively, the degradation efficiency is far higher than that of the anode electroactive without the addition of the sodium chloride, and the strong oxidizing substances such as active chlorine and the like formed in the oxidation process are mainly benefited. The oxidizing ability of the anode to electrically activate the persulfate can be promoted by the addition of a small amount of chloride ions.
Example 19
A method for treating AO 74 wastewater by using sodium persulfate through anodic electro-activation specifically comprises the following steps:
s1, adding 200mL of AO 74 wastewater with the concentration of 50mg/L into an anode chamber of an electrochemical reactor, and adding deionized water with the same volume into a cathode chamber;
s2, adding 3mmol/L sodium persulfate into the anode chamber, and adding 0.5mol/L Na2SO4As a supporting electrolyte; adding Na with equal concentration into cathode chamber2SO4Supporting the electrolyte.
S3, IrO is filled in the anode chamber2A Ti electrode, a stainless steel electrode with the same area is arranged in the cathode chamber, the power supply of the electrochemical reactor is switched on, and the current is set to be 60mA/cm2In the reaction process, the cathode chamber and the anode chamber are stirred at the speed of 400 rmp; monitoring the current and the color change of the wastewater in the reaction process;
and S4, after 3 hours of treatment, closing a power switch, opening a reactor anode chamber drainage system, and discharging the treated wastewater.
Example 20
The only difference from example 19 is that 5mmol/L sodium nitrate was added to the anode compartment.
Example 21
The only difference from example 19 is that 10mmol/L sodium nitrate was added to the anode compartment.
Example 22
The only difference from example 19 is that 20mmol/L sodium nitrate was added to the anode compartment.
Examples 19-22 were conducted to examine primarily the effect of sodium nitrate on the anodic electroactive sodium persulfate degradation of AO 74 wastewater, as shown in FIG. 6. It can be seen from FIG. 6 that a certain amount of sodium nitrate promotes the oxidation efficiency of the process for the electro-activation of sodium persulfate. After 3h degradation, the removal rates of AO 74 were 81.8%, 80.4%, 89.4% and 99.5% respectively at sodium nitrate concentrations of 0, 5, 10 and 20 mmol/L. When 5mmol/L sodium nitrate was added, the oxidation efficiency was comparable to that when no sodium nitrate was added, but when the sodium nitrate concentration was increased to 10, 20mmol/L, the removal rate of AO 74 was significantly increased, especially in the case of 20mmol/L, and almost complete removal was achieved. This is mainly due to the oxidizing species such as nitrate radicals formed during oxidation. The oxidizing ability of the anode to electrically activate the persulfate can thus be promoted by the addition of a certain amount of nitrate.
Example 23
A method for treating AO 74 wastewater by using sodium persulfate through anodic electro-activation specifically comprises the following steps:
s1, adding 200mL of AO 74 wastewater with the concentration of 50mg/L into an anode chamber of an electrochemical reactor, and adding deionized water with the same volume into a cathode chamber;
s2, adding 3mmol/L sodium persulfate into the anode chamber, and adding 0.5mol/L Na2SO4As a supporting electrolyte; adding Na with equal concentration into cathode chamber2SO4Supporting the electrolyte.
S3, IrO is filled in the anode chamber2a/Ti electrode with cathode chamber filled on the same sideThe stainless steel electrode is accumulated, the power supply of the electrochemical reactor is switched on, and the current is set to be 60mA/cm2In the reaction process, the cathode chamber and the anode chamber are stirred at the speed of 400 rmp; monitoring the current and the color change of the wastewater in the reaction process;
and S4, after 3 hours of treatment, closing a power switch, opening a reactor anode chamber drainage system, and discharging the treated wastewater.
Example 24
The only difference from example 23 is that 5mmol/L sodium phosphate was added to the anode compartment.
Example 25
The only difference from example 23 is that 10mmol/L sodium phosphate was added to the anode compartment.
Example 26
The only difference from example 23 is that 20mmol/L sodium phosphate was added to the anode compartment.
Examples 23-26 were conducted to examine the effect of sodium phosphate on the anodic electroactive sodium persulfate degradation of AO 74 wastewater, as shown in FIG. 7. It can be seen from FIG. 7 that sodium phosphate did not significantly affect the oxidation efficiency of the process for anodically electroactive sodium persulfate.
Example 27
A method for treating AO 74 wastewater by using sodium persulfate through anodic electro-activation specifically comprises the following steps:
s1, adding 200mL of AO 74 wastewater with the concentration of 50mg/L into an anode chamber of an electrochemical reactor, and adding deionized water with the same volume into a cathode chamber;
s2, adding 3mmol/L sodium persulfate into the anode chamber, and adding 0.5mol/L Na2SO4As a supporting electrolyte; adding Na with equal concentration into cathode chamber2SO4Supporting the electrolyte.
S3, IrO is filled in the anode chamber2A Ti electrode, a stainless steel electrode with the same area is arranged in the cathode chamber, the power supply of the electrochemical reactor is switched on, and the current is set to be 60mA/cm2In the reaction process, the cathode chamber and the anode chamber are stirred at the speed of 400 rmp; monitoring the current and the color change of the wastewater in the reaction process;
and S4, after 3 hours of treatment, closing a power switch, opening a reactor anode chamber drainage system, and discharging the treated wastewater.
Example 28
The only difference from example 27 is that 5mmol/L sodium carbonate was added to the anode compartment.
Example 29
The only difference from example 27 is that 10mmol/L sodium carbonate was added to the anode compartment.
Example 30
The only difference from example 27 is that 20mmol/L sodium carbonate was added to the anode compartment.
Examples 27-30 were conducted primarily to examine the effect of sodium carbonate on the anodic electroactive sodium persulfate degradation of AO 74 wastewater, as shown in FIG. 8. It can be seen from FIG. 8 that the excess of sodium carbonate exerts a certain inhibiting effect on the oxidation efficiency of the process for the anodic electro-activation of sodium persulfate. When the concentration of sodium carbonate is 5mmol/L, the oxidation efficiency of the electroactive sodium persulfate on the anode is hardly affected. However, as the sodium carbonate concentration continues to increase, the degradation efficiency decreases slightly. When the concentration of sodium carbonate is 20mmol/L, the removal rate of AO 74 wastewater is reduced to 74.9 percent after 3 hours of degradation. Thus, the excess sodium carbonate inhibits the anodic electroactive sodium persulfate.
Embodiment 31 a method for treating AO 74 wastewater by anodic electroactive sodium persulfate, comprising the steps of:
s1, adding 200mL of AO 74 wastewater with the concentration of 50mg/L into an anode chamber of an electrochemical reactor, and adding deionized water with the same volume into a cathode chamber;
s2, adding 3mmol/L sodium persulfate into the anode chamber, and adding 0.5mol/L Na2SO4As a supporting electrolyte, 1mmol/L NaCl and 10mmol/L NaNO are added respectively3(ii) a Adding Na with equal concentration into cathode chamber2SO4Supporting the electrolyte.
S3, IrO is filled in the anode chamber2A Ti electrode, a stainless steel electrode with the same area is arranged in the cathode chamber, the power supply of the electrochemical reactor is switched on, and the current is set to be 60mA/cm2In the reaction process, the cathode chamber and the anode chamber are stirred at the speed of 400 rmp; monitoring the current and the color change of the wastewater in the reaction process;
and S4, after 3 hours of treatment, closing a power switch, opening a reactor anode chamber drainage system, and discharging the treated wastewater.
Example 31 investigation of NaCl and NaNO3The synergistic effect on anodic electroactive persulfate treatment of acid orange 74 wastewater is shown in particular in fig. 9. When NaCl is 1mmol/L and NaNO is 10mmol/L3When coexisting, the AO 74 wastewater can be completely removed within 25min, which is obviously faster than adding 1mmol/L NaCl and 10mmol/L NaNO separately3The degradation process of (1). Shows that NaCl and NaNO are present3When coexisting, the catalyst can produce synergistic enhancement effect on the oxidation efficiency of the process for electrically activating the sodium persulfate by the anode.
The technical scope of the invention claimed by the embodiments herein is not exhaustive and new solutions formed by equivalent replacement of single or multiple technical features in the embodiments are also within the scope of the invention, and all parameters involved in the solutions of the invention do not have mutually exclusive combinations if not specifically stated.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of this invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of this invention should be included within the scope of protection of this invention.

Claims (10)

1. A method for treating printing and dyeing wastewater by electrochemically activating persulfate through an anode is characterized by comprising the following steps:
s1, adding a certain amount of printing and dyeing wastewater to be treated into the anode chamber of the electrochemical reactor, and adding deionized water with the same volume into the cathode chamber;
s2, adding persulfate with specific concentration into the anode chamber, and adding Na with specific concentration2SO4As a supporting electrolyte; adding Na with equal concentration into cathode chamber2SO4As a supporting electrolyte.
S3, installing a dimensionally stable anode in the anode chamber, installing stainless steel electrodes with the same area in the cathode chamber, switching on a power supply of the electrochemical reactor, and monitoring the current and the color change of the wastewater in the reaction process;
and S4, opening a reactor anode chamber drainage system after the reaction is finished, and discharging the treated wastewater.
2. The method for anodic electroactive persulfate treatment of printing and dyeing wastewater as claimed in claim 1, wherein the electrochemical reaction in step S1 is a two-chamber reactor, the anode and cathode chambers being separated by a proton exchange membrane or the anode and cathode chambers being connected by a salt bridge.
3. The method for anodic electroactive persulfate treatment of printing and dyeing wastewater as claimed in claim 1, wherein the persulfate in step S2 is usually peroxodisulfate, such as Na2S2O8The concentration of the persulfate is controlled to be 1-5 mmol/L.
4. The method for treating printing and dyeing wastewater by anodic electroactive persulfate as claimed in claim 1, wherein Na is added in step S22SO4Enhance the conductivity of the solution, anode chamber Na2SO4The concentration is controlled between 0.5 and 1 mol/L.
5. The method for treating printing and dyeing wastewater by anodic electroactive persulfate as claimed in any of claims 1 to 4, wherein the dimensionally stable anode in the step S3 is IrO2/Ti、RuO2/Ti or SnO2a/Ti electrode.
6. The method for treating printing and dyeing wastewater by anodic electroactive persulfate as claimed in any of claims 1 to 4, wherein the current density is controlled to be 30 to 70mA/cm after the electrochemical reactor is turned on in step S32The voltage does not exceed 20V and can pass through Na2SO4The addition amount of the catalyst is used for adjusting the conductivity of the wastewater and controlling the voltage.
7. According to any one of claims 1 to 4The method for treating printing and dyeing wastewater by using the anode to electrically activate persulfate is characterized in that an electrolyte A is further added into the anode chamber in the step S3, wherein the electrolyte A is NaCl and NaNO3、Na3PO4Or Na2CO3One or more of them.
8. The method for treating printing and dyeing wastewater by anodic electroactive persulfate as claimed in claim 7, wherein the electrolyte A added to the anode chamber is sodium chloride, and the concentration of the sodium chloride in the anode chamber is 0.5 to 5 mmol/L.
9. The method for treating printing and dyeing wastewater by using the anodic electroactive persulfate as claimed in claim 7, wherein the electrolyte A added to the anode chamber is sodium nitrate, and the concentration of the sodium nitrate in the anode chamber is 5 to 20 mmol/L.
10. The method for anodic electrochemical activation of persulfate as in any of claims 1-4, wherein the printing wastewater is acid orange 74.
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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004073926A (en) * 2002-08-12 2004-03-11 Sumitomo Metal Mining Co Ltd Treatment method of nitrate nitrogen-containing wastewater
KR20040086096A (en) * 2003-04-01 2004-10-08 주식회사 세창엔지니어링 Electrochemical process for wastewater containing nitric acid
CN104787853A (en) * 2015-03-31 2015-07-22 武汉大学 Electrochemical method cooperated with active carbon for activating persulfate for treating organic wastewater
CN108033522A (en) * 2017-12-21 2018-05-15 南昌航空大学 A kind of electro-catalysis couples advanced oxidation system
CN109081401A (en) * 2018-10-25 2018-12-25 重庆大学 Anode and cathode simultaneous shot persulfate-ozone degradation water pollutant method
CN109133259A (en) * 2018-09-26 2019-01-04 上海电力学院 A method of utilizing light anode activation sulfuric acid salt treatment waste water and by-product hydrogen
CN110818037A (en) * 2019-11-18 2020-02-21 北京师范大学 Electric oxidation reduction treatment process for reverse osmosis concentrated water
CN110902776A (en) * 2019-11-23 2020-03-24 同济大学 Method for generating sulfate radical free radical oxidation pollutants through in-situ electrocatalysis
WO2020115317A1 (en) * 2018-12-06 2020-06-11 The University Court Of The University Of Glasgow Method for oxidising sulfate
CN112062225A (en) * 2020-08-04 2020-12-11 中国科学院山西煤炭化学研究所 Method for degrading organic matters by three-dimensional electroactive persulfate of sulfur-doped activated carbon particle electrode
CN113620389A (en) * 2020-06-24 2021-11-09 叶旖婷 Method and device for treating wastewater through electricity-synergetic oxidation reaction
US20220306498A1 (en) * 2019-06-19 2022-09-29 Evoqua Water Technologies Llc Electrochemically activated persulfate for advanced oxidation processes

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004073926A (en) * 2002-08-12 2004-03-11 Sumitomo Metal Mining Co Ltd Treatment method of nitrate nitrogen-containing wastewater
KR20040086096A (en) * 2003-04-01 2004-10-08 주식회사 세창엔지니어링 Electrochemical process for wastewater containing nitric acid
CN104787853A (en) * 2015-03-31 2015-07-22 武汉大学 Electrochemical method cooperated with active carbon for activating persulfate for treating organic wastewater
CN108033522A (en) * 2017-12-21 2018-05-15 南昌航空大学 A kind of electro-catalysis couples advanced oxidation system
CN109133259A (en) * 2018-09-26 2019-01-04 上海电力学院 A method of utilizing light anode activation sulfuric acid salt treatment waste water and by-product hydrogen
CN109081401A (en) * 2018-10-25 2018-12-25 重庆大学 Anode and cathode simultaneous shot persulfate-ozone degradation water pollutant method
WO2020115317A1 (en) * 2018-12-06 2020-06-11 The University Court Of The University Of Glasgow Method for oxidising sulfate
US20220306498A1 (en) * 2019-06-19 2022-09-29 Evoqua Water Technologies Llc Electrochemically activated persulfate for advanced oxidation processes
CN110818037A (en) * 2019-11-18 2020-02-21 北京师范大学 Electric oxidation reduction treatment process for reverse osmosis concentrated water
CN110902776A (en) * 2019-11-23 2020-03-24 同济大学 Method for generating sulfate radical free radical oxidation pollutants through in-situ electrocatalysis
CN113620389A (en) * 2020-06-24 2021-11-09 叶旖婷 Method and device for treating wastewater through electricity-synergetic oxidation reaction
CN112062225A (en) * 2020-08-04 2020-12-11 中国科学院山西煤炭化学研究所 Method for degrading organic matters by three-dimensional electroactive persulfate of sulfur-doped activated carbon particle electrode

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
T.A.KENOVA: "Electrocatalytic oxidation of organic pollutants on boron-doped diamond and Ti-Ru oxide anodes in sulfate medium", vol. 91, no. 9, pages 1412 - 1421, XP036652941, DOI: 10.1134/S1070427218090021 *
宋浩然: "电活化过硫酸盐降解典型有机污染物效能与作用机制", no. 2019, pages 20 - 21 *
宋雄伟: "过硫酸盐高级氧化技术处理水体中难降解有机化合物的研究", no. 2020, pages 38 *

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