CN210559900U - Chemical nickel waste water electrocatalytic oxidation treatment system - Google Patents
Chemical nickel waste water electrocatalytic oxidation treatment system Download PDFInfo
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- CN210559900U CN210559900U CN201920420109.9U CN201920420109U CN210559900U CN 210559900 U CN210559900 U CN 210559900U CN 201920420109 U CN201920420109 U CN 201920420109U CN 210559900 U CN210559900 U CN 210559900U
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Abstract
The utility model discloses a chemistry nickel waste water electrocatalytic oxidation processing system, the utility model discloses a chemistry nickel waste water electrocatalytic oxidation processing system includes: an electrocatalytic oxidation reactor, a coagulation reaction box, a clarifier and a biochemical treatment device. Chemical nickel waste water enters an electrocatalytic oxidation reactor through pumping or self-flowing, the process of complex breaking is completed under the electrocatalytic oxidation action, the chemical nickel waste water enters a coagulation reaction box through self-flowing or pumping, free nickel is converted into nickel hydroxide precipitate through adding lime milk or liquid alkali, a coagulant and a coagulant aid, the nickel hydroxide precipitate automatically flows into a clarifier, clear water obtained by the clarifier enters a biochemical treatment device for further treatment to obtain water reaching the standard, and the water reaching the standard can be recycled or discharged for treatment.
Description
Technical Field
The utility model belongs to the environmental engineering field, in particular to chemical nickel waste water electrocatalytic oxidation processing system.
Background
The chemical nickel wastewater mainly comes from a chemical nickel plating process and contains heavy metal nickel, hypophosphite, phosphite and hypophosphite, and the heavy metal nickel exists in a complex state, so that the nickel, phosphorus and COD exceed the standard at the same time when the treatment is improper. Different from the common complexing wastewater, the ligand of the chemical nickel wastewater simultaneously contains an organic complexing agent and an inorganic complexing agent, the organic complexing agent is mostly ligand such as citric acid, the inorganic ligand is mostly phosphite, and the ligand of the chemical nickel wastewater simultaneously contains organic and inorganic ligands, so that the complex breaking process of the chemical nickel wastewater is more complicated than that of the common complexing wastewater. The discharge of nickel as a heavy metal into the environment of a water body causes heavy metal pollution, and thus the discharge concentration thereof needs to be strictly controlled. In the national electroplating pollutant discharge standard GB 21900-2008, in areas where the development density of the national soil is high, the environmental bearing capacity begins to weaken, or the water environment capacity is small, the ecological environment is fragile, and the serious water environment pollution problem easily occurs, and special protection measures need to be taken, the pollutant discharge behavior of the facility should be strictly controlled, and the standard in the table III (less than or equal to 0.1mg/L) is executed.
The traditional treatment process of the chemical nickel wastewater mainly comprises a chemical method (comprising an oxidation method, a precipitation method and the like), a physicochemical method (comprising an adsorption method, an ion exchange method, a membrane separation method and the like), a biochemical method (comprising a biological flocculation method, a biological adsorption method and the like) and the like. Representative methods include oxidation, sulfide precipitation, ion exchange, and the like, wherein the oxidation is typified by Fenton oxidation and sodium hypochlorite oxidation. However, chemical agents such as acid, alkali, sodium hypochlorite, hydrogen peroxide, ferrous salt and the like are required to be added in the treatment processes of the Fenton oxidation method and the sodium hypochlorite oxidation method, so that the dependence on the agents is strong, and the treatment cost is high. With the increasing of environmental protection, the prices of various chemical raw materials are increasing, and the cost of the traditional treatment method relying on chemical agents is also increasing. According to the specific important field of equipment development in the guidance suggestion about accelerating the development of the environmental protection equipment manufacturing industry in 2017 of the Ministry of industry and belief of China, the method explains' important attacking anaerobic ammonia oxidation technical equipment, electrolytic catalytic oxidation, supercritical oxidation and other oxidation technical equipment, researches and developments of advanced membrane treatment technologies and components with biological enhancement, low energy consumption and high efficiency, develops basic researches and other technical equipment for treating trace toxic pollutants in drinking water, treats chemical nickel wastewater in an electrochemical mode, and is a novel chemical nickel wastewater treatment technology which is more green and clean and also has low cost.
Disclosure of Invention
The purpose of the invention is as follows: the utility model aims to solve the defects in the prior art and provide a chemical nickel wastewater electrocatalytic oxidation treatment method and system, under the action of an electric field, the chemical nickel wastewater reacts with a strong oxidizing intermediate product generated by an anode of an electrocatalytic oxidation reactor, and a ligand (comprising an organic ligand and an inorganic ligand) is oxidized into carbon dioxide, water and other small molecules or orthophosphate radicals to complete the process of 'complex breaking'; under the action of an electric field, chemical nickel wastewater is in direct contact reaction with the cathode of an electrocatalytic oxidation reactor, and free or complex nickel is reduced into a nickel simple substance and attached to the cathode to complete the process of breaking the complex. And (3) the wastewater after the complex breaking is fed into a coagulation reaction box, nickel hydroxide precipitate is formed by reaction of the wastewater with lime milk or alkali liquor, a coagulant and a coagulant aid, nickel sludge and clear water are obtained by separation through a clarifier, the clear water is fed into a biochemical reaction device to further remove pollutants such as COD (chemical oxygen demand), total nitrogen, total phosphorus and the like, and finally the discharged water meets the standard shown in the table III of GB 21900-2008 'discharge Standard of electroplating pollutants'.
The utility model discloses a chemical nickel waste water electrocatalytic oxidation treatment technique includes: an electrocatalytic oxidation reactor, a coagulation reaction box, a clarifier and a biochemical treatment device. Chemical nickel waste water enters an electrocatalytic oxidation reactor through pumping or self-flowing, the process of complex breaking is completed under the electrocatalytic oxidation action, the chemical nickel waste water enters a coagulation reaction box through self-flowing or pumping, free nickel is converted into nickel hydroxide precipitate through adding lime milk or liquid alkali, a coagulant and a coagulant aid, the nickel hydroxide precipitate automatically flows into a clarifier, clear water obtained by the clarifier enters a biochemical treatment device for further treatment to obtain water reaching the standard, and the water reaching the standard can be recycled or discharged for treatment.
The technical scheme is as follows:
an electrocatalytic oxidation treatment system for chemical nickel wastewater, comprising: an electrocatalytic oxidation reactor, a coagulation reaction box, a clarifier and a biochemical treatment device;
the electrocatalytic oxidation reactor is connected with the coagulation reaction box and is used for electrocatalytic oxidation of the nickel-containing wastewater;
the coagulation reaction box is connected with the clarifier and is used for converting free nickel into nickel hydroxide precipitate by adding lime milk or liquid alkali, a coagulant and a coagulant aid;
the clarifier is connected with the biochemical treatment device and is used for obtaining clear water through clarification;
and the biochemical treatment device is used for treating the clarified water through microorganisms to obtain standard water.
The further improvement of the utility model lies in that,
the electrocatalytic oxidation reactor consists of a reactor box body, a reactor sealing plate, an anode, a cathode, a power supply, an anode cable, a cathode cable and an insulating base plate;
the water inlet is arranged on the reactor box body;
the water outlet is also arranged on the reactor box body;
the water outlet is positioned above the water inlet;
an outlet for delivering the generated carbon dioxide;
a sewage discharge port arranged at the bottom of the reactor box body;
the reactor sealing plate is arranged at the top of the electrocatalytic oxidation reactor and is detachably connected with the electrocatalytic oxidation reactor;
the insulating base plate is arranged at the bottom in the electrocatalytic oxidation reactor;
the anode and the cathode are arranged in the electrocatalytic oxidation reactor and are positioned above the insulating base plate;
the cathode cable 107 is connected with the power supply 105 and the cathode;
the anode cable 106 is connected to the power source 105 and the anode 103.
The utility model has the further improvement that the reactor box body 101, the reactor sealing plate 102, the anode 103, the cathode 104, the power supply 105, the anode cable 106 and the cathode cable 107 are insulated, namely, the insulating layer is arranged at the connection or close distance; the power supply 105 is a low voltage, high current, high power dc power supply.
The utility model discloses a further improvement lies in, is equipped with the sealing washer between reactor box 101 and the reactor closing plate 102, and reactor box 101 adopts to compress tightly sealed mode with reactor closing plate 102 and is connected.
The further improvement of the utility model lies in that the anode 103 is an inert inactive electrode which can be a titanium-based metal oxide composite electrode containing one or more of metals such as titanium platinum ruthenium iridium lead tin and the like in the titanium-based metal oxide composite electrode.
The utility model has the further improvement that one end of the anode cable 106 is connected with the power supply 105, and the other end is fixed with the anode pull rod 113 through a bolt 115; the anode pull rod 113 and each anode 103 are respectively fixed and electrified through bolts 115; one end of the cathode cable 107 is connected with the power supply 105, and the other end is fixed with the cathode pull rod 114 through a bolt 115; the cathode pull rod 114 and each anode 103 are respectively fixed and electrified through bolts 115; the distance between anode 103 and cathode 104 is adjusted by adjusting the position of bolt 115.
The further improvement of the utility model lies in that the anode cable 106 and the cathode cable 107 are copper bars or aluminum bars.
The utility model discloses a further improvement lies in, electrocatalytic oxidation reactor 1 is the multiunit, and a plurality of electrocatalytic oxidation reactors 1 link to each other through parallelly connected or series connection.
An electrocatalytic oxidation treatment method for chemical nickel wastewater comprises the following specific steps:
1) conveying the nickel-containing wastewater to an electrocatalytic oxidation reactor 1;
2) in an electrocatalytic oxidation reactor 1, carrying out electrocatalytic oxidation on the nickel-containing wastewater;
3) entering a coagulation reaction box 2 for neutralization reaction;
4) entering a clarifier 3 for clarification;
5) entering the biochemical treatment device 4 for biochemical treatment.
The further improvement of the utility model lies in that,
in the step 1), nickel-containing wastewater enters an electrocatalytic oxidation reactor 1 from a water inlet 109;
in the step 2), the nickel-containing wastewater is subjected to electrocatalytic oxidation under the action of the anode 103 and the cathode 104, and the electrolyzed wastewater flows out from the water outlet 110;
in the step 3), lime milk or liquid alkali, coagulant and coagulant aid are added to convert the free nickel into nickel hydroxide precipitate.
The utility model discloses a chemical nickel waste water electrocatalytic oxidation treatment technology, including following process:
(1) when a single electrocatalytic oxidation reactor is used, chemical nickel wastewater enters the electrocatalytic oxidation reactor through pumping or self-flowing; when a plurality of electrocatalytic oxidation reactors are used in series, chemical nickel wastewater enters a first electrocatalytic oxidation reactor through pumping or self-flowing, the effluent of the first electrocatalytic oxidation reactor enters a second electrocatalytic oxidation reactor, and the subsequent effluent sequentially enters a subsequent reactor; when a plurality of electrocatalytic oxidation reactors are used in parallel, chemical nickel wastewater is conveyed into a water inlet distributor through a pump, and the wastewater is uniformly distributed into each electrocatalytic oxidation reactor through the distributor;
(2) after chemical nickel wastewater enters an electrocatalytic oxidation reactor, the anode of the reactor is contacted with the wastewater to carry out direct oxidation reaction or indirect oxidation reaction, and for organic ligands, the direct oxidation reaction process comprises the following steps:
the indirect oxidation reaction process comprises hydroxyl radical indirect oxidation, hypochlorite radical indirect oxidation and the like, and the hydroxyl radical indirect oxidation reaction process comprises the following steps:
OH--e-→·OH
the sodium hypochlorite indirect oxidation reaction process is as follows:
2Cl--2e-→Cl2(liq)
OH--e-→·OH
2Cl-+2·OH→Cl2(liq)+2OH-
Cl2(liq)+2OH-→Cl-+ClO-+H2O
for inorganic ligands, represented by phosphites, the direct oxidation process is as follows:
the process of the hydroxyl radical indirect oxidation reaction is as follows:
OH--e-→·OH
the sodium hypochlorite indirect oxidation reaction process is as follows:
2Cl--2e-→Cl2(liq)
OH--e-→·OH
2Cl-+2·OH→Cl2(liq)+2OH-
Cl2(liq)+2OH-→Cl-+ClO-+H2O
the reactor cathode undergoes a reduction reaction as follows:
after oxidation and reduction reaction, the organic ligand and inorganic ligand in the waste water are quickly oxidized into carbon dioxide, nitrogen, water and other small molecules, or oxidized into orthophosphate radical and other small molecules, nickel complexed with the ligands is synchronously converted into a free state from a complex state, part of nickel is directly reduced into a simple substance, and the chemical nickel waste water completes the process of breaking complexation.
(3) Chemical nickel wastewater which finishes the process of 'complex breaking' flows out of an electrocatalytic oxidation reactor and enters a coagulation reaction box through a pump or self-flowing, the coagulation reaction box reacts with free nickel ions through adding alkaline reagents such as lime milk or liquid alkali and the like to form nickel hydroxide precipitate, large floc is formed under the action of a coagulant and a coagulant aid and enters a clarifier for separation, the separated sludge is nickel-containing sludge which can be subjected to ex-situ treatment, and clear water flows out of the upper part of the clarifier.
(4) The clear water at the upper part of the clarifier basically finishes the process of breaking the complex and removing heavy metals, the residual pollutants comprise COD, total nitrogen, total phosphorus and the like, and after the residual pollutants enter a biochemical treatment device for treatment and removal of the COD, the total nitrogen and the total phosphorus, the effluent meets the standard of Table III of GB 21900-2008 'discharge Standard of electroplating pollutants'.
Along with the requirement of environmental protection constantly promotes, chemical nickel waste water treatment goes out to carry out GB 21900-2008 "electroplating pollutant discharge standard" table III standard and is compelling to be very much, and the chemical nickel waste water treatment process that still adopts such as present majority electroplating enterprise, electroplating garden, PCB manufacturing enterprise is "Fenton oxidation method" or "sodium hypochlorite oxidation method", the utility model discloses to chemical nickel waste water, provide a chemical nickel waste water electricity catalytic oxidation treatment technology, need not to add oxidant, the medicament dependence is low, the running cost is low, "broken twine closes" process thoroughly, the system is simple, the operation is reliable and stable, can reduce the sludge amount by a wide margin simultaneously.
Compared with the prior art, the utility model provides a pair of chemistry nickel waste water electricity catalytic oxidation treatment method and system has realized following beneficial effect at least:
compared with the traditional Fenton oxidation method:
(1) the reaction condition is mild, strong acid or strong alkali is not needed, and the wastewater can directly enter the electrocatalytic oxidation reactor without adjusting the pH value and carry out the 'complex breaking' process;
(2) ferrite, hydrogen peroxide and the like are not required to be consumed, acid and alkali added for frequently adjusting pH are not required to be consumed, the dosage of the added medicament is small, and the dependence of wastewater treatment on the medicament is reduced;
(3) ferrous salt is not needed to be added, the amount of the generated sludge is greatly reduced, and the nickel content in the sludge obtained by sedimentation is higher due to the influence of iron-free metal ions, so that resource recovery treatment can be carried out;
(4) the wastewater treatment cost is greatly reduced due to the main dependence on electricity;
(5) the core equipment of the electrocatalytic oxidation treatment technology, namely the electrocatalytic oxidation reactor, has the advantages of few control variables, simple control process and easy realization of automation.
Compared with the traditional sodium hypochlorite oxidation method:
(1) the oxidation capability is strong, the influence of the ligand type is small, and the complex breaking process is thorough;
(2) sodium hypochlorite is not consumed, the dosage of the added medicament is less, and the dependence of wastewater treatment on the medicament is reduced;
(3) the wastewater treatment cost is greatly reduced due to the main dependence on electricity;
(4) reducing nickel on the cathode of the reactor, so that the total amount of nickel entering the sludge is reduced, and the sludge amount is properly reduced;
(5) the core equipment of the electrocatalytic oxidation treatment technology, namely the electrocatalytic oxidation reactor, has the advantages of few control variables, simple control process and easy realization of automation.
Of course, it is not necessary for any product of the present invention to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic view of the electrocatalytic oxidation treatment technique for chemical nickel wastewater of the present invention;
FIG. 2 is a schematic diagram of the structure of a chemical nickel wastewater electrocatalytic oxidation reactor;
FIG. 3 is a schematic diagram of the power supply of the electrocatalytic oxidation reactor for chemical nickel wastewater;
in the figure: 1-an electrocatalytic oxidation reactor; 2-a coagulation reaction box; 3-a clarifier; 4-a biochemical treatment device; 101-a reactor tank; 102-reactor seal plate; 103-anode; 104-a cathode; 105-a power supply; 106-anode cable; 107-cathode cable; 108-an insulating spacer; 109-a water inlet; 110-a water outlet; 111-gas outlet; 112-a sewage draining outlet; 113-anode tie rod; 114-cathode tie rod; 115-distance bolt.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail. It should be noted that: unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
In the case of the example 1, the following examples are given,
as shown in fig. 1, 2 and 3, a method for treating chemical nickel wastewater by electrocatalytic oxidation comprises the following specific steps:
1) conveying the nickel-containing wastewater to an electrocatalytic oxidation reactor 1;
2) in an electrocatalytic oxidation reactor 1, carrying out electrocatalytic oxidation on the nickel-containing wastewater;
3) entering a coagulation reaction box 2 for neutralization reaction;
4) entering a clarifier 3 for clarification;
5) entering the biochemical treatment device 4 for biochemical treatment.
To further explain the present embodiment, it is to be noted that,
in the step 1), nickel-containing wastewater enters an electrocatalytic oxidation reactor 1 from a water inlet 109;
in the step 2), the nickel-containing wastewater is subjected to electrocatalytic oxidation under the action of the anode 103 and the cathode 104, and the electrolyzed wastewater flows out from the water outlet 110;
in the step 3), lime milk or liquid alkali, coagulant and coagulant aid are added to convert the free nickel into nickel hydroxide precipitate.
The utility model discloses a chemical nickel waste water electrocatalytic oxidation treatment technology, including following process:
(1) when a single electrocatalytic oxidation reactor is used, chemical nickel wastewater enters the electrocatalytic oxidation reactor through pumping or self-flowing; when a plurality of electrocatalytic oxidation reactors are used in series, chemical nickel wastewater enters a first electrocatalytic oxidation reactor through pumping or self-flowing, the effluent of the first electrocatalytic oxidation reactor enters a second electrocatalytic oxidation reactor, and the subsequent effluent sequentially enters a subsequent reactor; when a plurality of electrocatalytic oxidation reactors are used in parallel, chemical nickel wastewater is conveyed into a water inlet distributor through a pump, and the wastewater is uniformly distributed into each electrocatalytic oxidation reactor through the distributor;
(2) after chemical nickel wastewater enters an electrocatalytic oxidation reactor, the anode of the reactor is contacted with the wastewater to carry out direct oxidation reaction or indirect oxidation reaction, and for organic ligands, the direct oxidation reaction process comprises the following steps:
the indirect oxidation reaction process comprises hydroxyl radical indirect oxidation, hypochlorite radical indirect oxidation and the like, and the hydroxyl radical indirect oxidation reaction process comprises the following steps:
OH--e-→·OH
the sodium hypochlorite indirect oxidation reaction process is as follows:
2Cl--2e-→Cl2(liq)
OH--e-→·OH
2Cl-+2·OH→Cl2(liq)+2OH-
Cl2(liq)+2OH-→Cl-+ClO-+H2O
for inorganic ligands, represented by phosphites, the direct oxidation process is as follows:
the process of the hydroxyl radical indirect oxidation reaction is as follows:
OH--e-→·OH
the sodium hypochlorite indirect oxidation reaction process is as follows:
2Cl--2e-→Cl2(liq)
OH--e-→·OH
2Cl-+2·OH→Cl2(liq)+2OH-
Cl2(liq)+2OH-→Cl-+ClO-+H2O
the reactor cathode undergoes a reduction reaction as follows:
after oxidation and reduction reaction, the organic ligand and inorganic ligand in the waste water are quickly oxidized into carbon dioxide, nitrogen, water and other small molecules, or oxidized into orthophosphate radical and other small molecules, nickel complexed with the ligands is synchronously converted into a free state from a complex state, part of nickel is directly reduced into a simple substance, and the chemical nickel waste water completes the process of breaking complexation.
(3) Chemical nickel wastewater which finishes the process of 'complex breaking' flows out of an electrocatalytic oxidation reactor and enters a coagulation reaction box through a pump or self-flowing, the coagulation reaction box reacts with free nickel ions through adding alkaline reagents such as lime milk or liquid alkali and the like to form nickel hydroxide precipitate, large floc is formed under the action of a coagulant and a coagulant aid and enters a clarifier for separation, the separated sludge is nickel-containing sludge which can be subjected to ex-situ treatment, and clear water flows out of the upper part of the clarifier.
(4) The clear water at the upper part of the clarifier basically finishes the process of breaking the complex and removing heavy metals, the residual pollutants comprise COD, total nitrogen, total phosphorus and the like, and after the residual pollutants enter a biochemical treatment device for treatment and removal of the COD, the total nitrogen and the total phosphorus, the effluent meets the standard of Table III of GB 21900-2008 'discharge Standard of electroplating pollutants'.
Along with the requirement of environmental protection constantly promotes, chemical nickel waste water treatment goes out to carry out GB 21900-2008 "electroplating pollutant discharge standard" table III standard and is compelling to be very much, and the chemical nickel waste water treatment process that still adopts such as present majority electroplating enterprise, electroplating garden, PCB manufacturing enterprise is "Fenton oxidation method" or "sodium hypochlorite oxidation method", the utility model discloses to chemical nickel waste water, provide a chemical nickel waste water electricity catalytic oxidation treatment technology, need not to add oxidant, the medicament dependence is low, the running cost is low, "broken twine closes" process thoroughly, the system is simple, the operation is reliable and stable, can reduce the sludge amount by a wide margin simultaneously.
In the case of the example 2, the following examples are given,
as shown in fig. 1, 2 and 3, an electrocatalytic oxidation treatment system for chemical nickel wastewater comprises: an electrocatalytic oxidation reactor 1, a coagulation reaction box 2, a clarifier 3 and a biochemical treatment device 4;
the electrocatalytic oxidation reactor 1 is connected with the coagulation reaction box 2 and is used for electrocatalytic oxidation of the nickel-containing wastewater;
a coagulation reaction tank 2 connected with the clarifier 3 and used for converting free nickel into nickel hydroxide precipitate by adding lime milk or liquid alkali, coagulant and coagulant aid;
the clarifier 3 is connected with the biochemical treatment device 4 and is used for obtaining clear water through clarification;
and the biochemical treatment device 4 is used for treating the clarified water through microorganisms to obtain water reaching the standard.
The further improvement of the utility model lies in that,
the electrocatalytic oxidation reactor 1 consists of a reactor box body 101, a reactor sealing plate 102, an anode 103, a cathode 104, a power supply 105, an anode cable 106, a cathode cable 107 and an insulating base plate 108;
a water inlet 109 arranged on the reactor box 101;
a water outlet 110 also arranged on the reactor box body 101;
the water outlet 110 is positioned above the water inlet 109;
an outlet 111 for delivering the generated carbon dioxide;
a drain port 112 provided at the bottom of the reactor tank 101;
the reactor sealing plate 102 is arranged at the top of the electrocatalytic oxidation reactor 1 and is detachably connected with the electrocatalytic oxidation reactor 1;
the insulating base plate 108 is arranged at the bottom in the electrocatalytic oxidation reactor 1;
the anode 103 and the cathode 104 are arranged in the electrocatalytic oxidation reactor 1 and are positioned above the insulating base plate 108;
the cathode cable 107 is connected with the power supply 105 and the cathode 104;
the anode cable 106 is connected to the power source 105 and the anode 103.
Based on the embodiment, the chemical nickel wastewater enters the electrocatalytic oxidation reactor 1 from the water inlet 109, and is subjected to a complex breaking reaction under the action of the anode 103 and the cathode 104, and the wastewater flows out from the water outlet 110 after the complex breaking reaction is completed. Carbon dioxide and the like generated by the "decomplexation" flow out from the gas outlet 111. The operation is continued for a while, and the washing water generated when the apparatus is washed flows out of the drain outlet 112.
To further explain the present embodiment, it is required to say that the reactor box 101, the reactor sealing plate 102 and the anode 103, the cathode 104, the power supply 105, the anode cable 106 and the cathode cable 107 are insulated, i.e. there is an insulating layer at the connection or close distance; the power supply 105 is a low voltage, high current, high power dc power supply.
For further explanation of the present embodiment, it is to be noted that a seal ring is disposed between the reactor box 101 and the reactor sealing plate 102, and the reactor box 101 and the reactor sealing plate 102 are connected in a pressure-tight manner.
To further explain this embodiment, it should be noted that the anode 103 is an inert inactive electrode, and may be a titanium-based metal oxide composite electrode, and the titanium-based metal oxide composite electrode contains one or more metals such as titanium, platinum, ruthenium, iridium, lead, tin, etc.
To further explain the present embodiment, it is noted that one end of the anode cable 106 is connected to the power source 105, and the other end is fixed to the anode rod 113 by the bolt 115; the anode pull rod 113 and each anode 103 are respectively fixed and electrified through bolts 115; one end of the cathode cable 107 is connected with the power supply 105, and the other end is fixed with the cathode pull rod 114 through a bolt 115; the cathode pull rod 114 and each anode 104 are respectively fixed and electrified through bolts 115; the distance between anode 103 and cathode 104 is adjusted by adjusting the position of bolt 115.
For further explanation of the present embodiment, it is to be noted that the anode cable 106 and the cathode cable 107 are copper bars or aluminum bars.
In order to further explain the embodiment, it is necessary to say that the electrocatalytic oxidation reactors 1 are in a plurality of groups, a plurality of electrocatalytic oxidation reactors 1 are connected in parallel or in series, and the electrocatalytic oxidation reactors 1 can be arranged in a plurality of groups in parallel or in series according to the water quality condition of the wastewater.
In the case of the example 3, the following examples are given,
as shown in figures 1, 2 and 3, the chemical nickel wastewater is produced in a chemical nickel plating process production line, the total nickel concentration is 400mg/L, the pH value is between 8 and 9, the COD is about 1000mg/L, and the conductivity is about 20000 mu S/cm. Chemical nickel waste water is conveyed to an electrocatalytic oxidation reactor 1 through a pump, the electrocatalytic oxidation reactor 1 is arranged in two stages, first-stage outlet water is used as second-stage inlet water, the voltage is controlled to be 4.5-5.0V for electrocatalytic oxidation reaction, the waste water is subjected to primary complexing breaking in the first-stage reactor and then enters a second-stage reactor for further complexing breaking, the total nickel concentration of the outlet water is 200mg/L, and meanwhile, nickel is completely converted into a free state from a complexing state and flows out of a water outlet 110.
The waste water flowing out of the water outlet 110 is buffered by a buffer tank, and then is conveyed to a coagulation reaction box 2 by a pump, lime milk or liquid caustic soda is added, the pH is controlled to be above the sedimentation pH of Ni, the Ni is converted into Ni (OH)2, then under the action of a coagulant and a coagulant aid, the precipitate floc is increased, and the precipitate floc enters a clarifier for solid-liquid separation, so that the sludge rich in nickel and clear water are obtained. Because the nickel is largely removed, the total nickel concentration in the clear water is within 0.1mg/L, and the standard of GB 21900-2008 'discharge Standard of electroplating pollutants' Table III is satisfied.
Through the 'complex breaking' of the electrocatalytic oxidation reactor and the 'nickel removal' of the coagulation clarification link, the residual pollutants in the wastewater mainly comprise COD, total nitrogen, total phosphorus and the like, and the part can be controlled to be discharged through a biochemical treatment device to meet the standard of the table III of GB 21900-2008 'discharge Standard of electroplating pollutants'.
In the case of the example 4, the following examples are given,
as shown in figures 1, 2 and 3, the chemical nickel wastewater is produced by a chemical nickel plating process production line, the total nickel concentration is 200mg/L, the total phosphorus concentration is 600mg/L, the pH value is 8-9, the COD is about 1000mg/L, and the conductivity is about 10000 mu S/cm. Chemical nickel wastewater is conveyed to an electrocatalytic oxidation reactor 1 through a pump, the electrocatalytic oxidation reactor 1 is arranged in a single stage, the electrocatalytic oxidation reaction is carried out under the control of the voltage of 5.0-5.5V, the wastewater is subjected to 'decomplexation' in the reactor, the total nickel concentration of effluent is 60 mg/L, and meanwhile, all nickel is converted from a complexed state to a free state and flows out of a water outlet 110.
The waste water from the water outlet 110 is buffered by a buffer pool, then is conveyed to a coagulation reaction box 2 by a pump, lime milk or liquid caustic soda is added, the pH is controlled to be above the sedimentation pH of Ni, and the Ni is converted into Ni (OH)2And then under the action of a coagulant and a coagulant aid, the precipitate floc is enlarged and enters a clarifier for solid-liquid separation to obtain the sludge rich in nickel and clear water. Because the nickel is largely removed, the total nickel concentration in the clear water is within 0.1mg/L, and the standard of GB 21900-2008 'discharge Standard of electroplating pollutants' Table III is satisfied.
Through the 'complex breaking' of the electrocatalytic oxidation reactor and the 'nickel removal' of the coagulation clarification link, the residual pollutants in the wastewater mainly comprise COD, total nitrogen, total phosphorus and the like, and the part can be controlled to be discharged through a biochemical treatment device to meet the standard of the table III of GB 21900-2008 'discharge Standard of electroplating pollutants'.
According to the embodiment, the utility model provides a pair of chemical nickel waste water electrocatalytic oxidation treatment method and system has realized following beneficial effect at least:
1. the utility model discloses need not to add that oxidant, medicament dependence are low, running cost is low, "break the complex and close" process thoroughly, the system is simple, the operation is reliable and stable, can reduce the sludge volume simultaneously by a wide margin.
2. Compared with the traditional Fenton oxidation method:
(1) the reaction condition is mild, strong acid or strong alkali is not needed, and the wastewater can directly enter the electrocatalytic oxidation reactor without adjusting the pH value and carry out the 'complex breaking' process;
(2) ferrite, hydrogen peroxide and the like are not required to be consumed, acid and alkali added for frequently adjusting pH are not required to be consumed, the dosage of the added medicament is small, and the dependence of wastewater treatment on the medicament is reduced;
(3) ferrous salt is not needed to be added, the amount of the generated sludge is greatly reduced, and the nickel content in the sludge obtained by sedimentation is higher due to the influence of iron-free metal ions, so that resource recovery treatment can be carried out;
(4) the wastewater treatment cost is greatly reduced due to the main dependence on electricity;
(5) the core equipment of the electrocatalytic oxidation treatment technology, namely the electrocatalytic oxidation reactor, has the advantages of few control variables, simple control process and easy realization of automation.
3. Compared with the traditional sodium hypochlorite oxidation method:
(1) the oxidation capability is strong, the influence of the ligand type is small, and the complex breaking process is thorough;
(2) sodium hypochlorite is not consumed, the dosage of the added medicament is less, and the dependence of wastewater treatment on the medicament is reduced;
(3) the wastewater treatment cost is greatly reduced due to the main dependence on electricity;
(4) reducing nickel on the cathode of the reactor, so that the total amount of nickel entering the sludge is reduced, and the sludge amount is properly reduced;
(5) the core equipment of the electrocatalytic oxidation treatment technology, namely the electrocatalytic oxidation reactor, has the advantages of few control variables, simple control process and easy realization of automation.
Although certain specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (8)
1. The utility model provides a chemistry nickel waste water electricity catalytic oxidation processing system which characterized in that includes: an electrocatalytic oxidation reactor (1), a coagulation reaction box (2), a clarifier (3) and a biochemical treatment device (4);
the electrocatalytic oxidation reactor (1) is connected with the coagulation reaction box (2) and is used for electrocatalytic oxidation of nickel-containing wastewater;
the coagulation reaction tank (2) is connected with the clarifier (3) and is used for converting free nickel into nickel hydroxide precipitate by adding lime milk or liquid alkali, a coagulant and a coagulant aid;
the clarifier (3) is connected with the biochemical treatment device (4) and is used for obtaining clear water through clarification;
and the biochemical treatment device (4) is used for treating the clarified water through microorganisms to obtain water reaching the standard.
2. The electrocatalytic oxidation treatment system for chemical nickel wastewater as set forth in claim 1, wherein the electrocatalytic oxidation reactor (1) is composed of a reactor box (101), a reactor sealing plate (102), an anode (103), a cathode (104), a power supply (105), an anode cable (106), a cathode cable (107) and an insulating pad (108);
the water inlet (109) is arranged on the reactor box body (101);
a water outlet (110) which is also arranged on the reactor box body (101);
the water outlet (110) is positioned above the water inlet (109);
an outlet (111) for delivering the generated carbon dioxide;
a drain outlet (112) arranged at the bottom of the reactor box body (101);
the reactor sealing plate (102) is arranged at the top of the electrocatalytic oxidation reactor (1) and is detachably connected with the electrocatalytic oxidation reactor (1);
the insulating base plate (108) is arranged at the bottom in the electrocatalytic oxidation reactor (1);
the anode (103) and the cathode (104) are arranged in the electrocatalytic oxidation reactor (1) and are positioned above the insulating base plate (108);
the cathode cable (107) is connected with the power supply (105) and the cathode (104);
the anode cable (106) is connected with the power supply (105) and the anode (103).
3. The electrocatalytic oxidation treatment system for chemical nickel wastewater as set forth in claim 2, wherein the reactor box (101), the reactor sealing plate (102), the anode (103), the cathode (104), the power supply (105), the anode cable (106) and the cathode cable (107) are insulated, i.e. an insulating layer is arranged at the connection or close distance; the power supply (105) is a low-voltage high-current high-power direct-current power supply.
4. The electrocatalytic oxidation treatment system for chemical nickel wastewater as set forth in claim 2,
a sealing ring is arranged between the reactor box body (101) and the reactor sealing plate (102), and the reactor box body (101) and the reactor sealing plate (102) are connected in a pressing sealing mode.
5. The electrocatalytic oxidation treatment system for chemical nickel wastewater as set forth in claim 2,
the anode (103) is an inert inactive electrode and can be a titanium-based metal oxide composite electrode which contains one or more of titanium, platinum, ruthenium, iridium, lead and tin metals.
6. The electrocatalytic oxidation treatment system for chemical nickel wastewater as set forth in claim 2,
one end of the anode cable (106) is connected with the power supply (105), and the other end of the anode cable is fixed with the anode pull rod (113) through a bolt (115); the anode pull rod (113) and each anode (103) are fixed through a bolt (115) and are electrified;
one end of the cathode cable (107) is connected with the power supply (105), and the other end of the cathode cable is fixed with the cathode pull rod (114) through a bolt (115); the cathode pull rod (114) and each anode (103) are fixed through a bolt (115) and are electrified;
the distance between the anode (103) and the cathode (104) is adjusted through the position of an adjusting bolt (115).
7. The electrocatalytic oxidation treatment system for chemical nickel wastewater as set forth in claim 2, wherein the anode cable (106) and the cathode cable (107) are copper bars or aluminum bars.
8. The electrocatalytic oxidation treatment system for chemical nickel wastewater as set forth in any one of claims 1-6, wherein said electrocatalytic oxidation reactors (1) are in a plurality of groups, and a plurality of said electrocatalytic oxidation reactors (1) are connected in parallel or in series.
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| CN109809652A (en) * | 2019-03-29 | 2019-05-28 | 江苏京源环保股份有限公司 | A kind of chemical nickel Wastewater by Electric treatment by catalytic oxidation and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109809652A (en) * | 2019-03-29 | 2019-05-28 | 江苏京源环保股份有限公司 | A kind of chemical nickel Wastewater by Electric treatment by catalytic oxidation and system |
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