CN110204016B - System and method for pickling ammonia-containing wastewater electrolysis device - Google Patents
System and method for pickling ammonia-containing wastewater electrolysis device Download PDFInfo
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- CN110204016B CN110204016B CN201910406563.3A CN201910406563A CN110204016B CN 110204016 B CN110204016 B CN 110204016B CN 201910406563 A CN201910406563 A CN 201910406563A CN 110204016 B CN110204016 B CN 110204016B
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- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 138
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 239000002351 wastewater Substances 0.000 title claims abstract description 55
- 238000005554 pickling Methods 0.000 title claims abstract description 44
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 31
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000002253 acid Substances 0.000 claims abstract description 26
- 230000001105 regulatory effect Effects 0.000 claims abstract description 13
- 239000013043 chemical agent Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 1
- 238000005406 washing Methods 0.000 abstract description 13
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 9
- 238000006056 electrooxidation reaction Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000000053 physical method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000834 fixative Substances 0.000 description 1
- -1 hydrogen ions Chemical class 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention relates to a system and a method for pickling an ammonia-containing wastewater electrolysis device, comprising the following steps: the device comprises an electrolysis device, an electric valve, an online pH meter, an inlet-outlet ammonia meter and a flow regulating valve; the ammonia-containing wastewater inlet is provided with a flow regulating valve and an inlet ammonia meter, and the outlet is provided with an outlet ammonia meter; the front-mounted electrolyzer is connected in series with the rear-mounted electrolyzer, an online pH meter is arranged between the two sets of electrolyzer, and the pH value of the solution in the front-mounted electrolyzer is lower than that of the solution in the rear-mounted electrolyzer. The beneficial effects of the invention are as follows: according to the invention, no additional pickling system is required, so that the equipment is simplified, and the construction cost is saved; no additional acid washing chemical agent is added, so that the acid washing cost is reduced. The ammonia nitrogen electrolysis device is not needed to be suspended in the pickling process, and the operation efficiency of the device is improved. The whole pickling operation process is automatically realized by a control system, so that the operability of the device is improved. And the use of strong acid is avoided, and the safety is improved.
Description
Technical Field
The invention belongs to the technical field of electrochemical oxidation, and particularly relates to a pickling system and method of an ammonia-containing wastewater electrolysis device.
Background
Electrochemical oxidation technology is one of advanced oxidation technologies, which effectively converts ammonia nitrogen in wastewater into harmless nitrogen through oxidation intermediates directly or indirectly generated by catalytic active electrodes. Electrochemical oxidation technology is widely favored as an "environment friendly" technology, one of the most likely advanced oxidation technologies to be applied industrially.
Electrochemical oxidation is used for treating ammonia nitrogen wastewater, and there are currently available patent applications (Chinese patent application numbers: 201810578267.7, 201810207990.4, 201721520710.2, 201810666277.6, 201820345842.4). In the running process of the electrochemical oxidation device, calcium and magnesium ions in the wastewater are easy to scale on the electrode, the electrode after scaling is affected in the electrolysis efficiency, and serious damage caused by polar plate breakdown is easy to occur. Therefore, conventional electrolytic equipment needs to be pickled regularly, and an acid pickling system is usually designed and arranged, and acid pickling agents such as hydrochloric acid and the like are additionally added. The equipment complexity is increased due to the arrangement of the pickling system, and the construction cost is increased; the periodic pickling step increases the operation complexity and also affects the continuous implementation of ammonia nitrogen wastewater treatment; acid washing agents carry high cost of the agents and also increase the risk of use of strongly acidic agents.
At present, an ammonia-containing wastewater electrolysis device without adding additional acid washing agents is not yet published, so that a system and a method for realizing acid washing of the ammonia-containing wastewater electrolysis device by adopting a zero chemical agent physical method are needed to be designed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a system and a method for realizing acid washing of an ammonia-containing wastewater electrolysis device by adopting a chemical agent-free physical method.
The system for pickling the ammonia-containing wastewater electrolyzer comprises an electrolyzer, an electric valve, an online pH meter, an inlet and outlet ammonia meter and a flow regulating valve; the ammonia-containing wastewater inlet is provided with a flow regulating valve and an inlet ammonia meter, and the outlet is provided with an outlet ammonia meter; the front-mounted electrolyzer is connected in series with the rear-mounted electrolyzer, an online pH meter is arranged between the two sets of electrolyzer, and the pH value of the solution in the front-mounted electrolyzer is lower than that of the solution in the rear-mounted electrolyzer; two ports of the two sets of electrolytic devices are respectively provided with an electric valve; all the electric valves, the flow regulating valves and the electrolysis device are connected to a remote control system; the ammonia-containing wastewater flows in through the flow regulating valve and the inlet ammonia meter, sequentially flows through the electric valve, the front-mounted electrolysis device, the on-line pH meter, the rear-mounted electrolysis device and the electric valve, and flows out from the outlet ammonia meter to form product water.
As preferable: each set of electrolysis device is composed of a water inlet pump and an electrolysis bath in sequence and is provided with an independent hydrogen discharging port.
As preferable: the electrolysis device is divided into an electrolysis device 1 and an electrolysis device 2, wherein an electric valve 1 and an electric valve 2 are respectively arranged at two ports of the electrolysis device 1, and an electric valve 3 and an electric valve 4 are respectively arranged at two ports of the electrolysis device 2; when the electrolysis device 1 is used as a front-mounted electrolysis device and the electrolysis device 2 is used as a rear-mounted electrolysis device, the electric valve 1, the electrolysis device 1, the online pH meter, the electrolysis device 2 and the electric valve 4 are sequentially connected in series; when the electrolysis device 2 is used as a front-end electrolysis device and the electrolysis device 1 is used as a rear-end electrolysis device, the electric valve 3, the electrolysis device 2, the online pH meter, the electrolysis device 1 and the electric valve 2 are sequentially connected in series.
An acid cleaning method of an acid cleaning system of an ammonia-containing wastewater electrolysis device comprises the following steps:
1) Before the system runs, firstly, the electric valve 2 and the electric valve 3 are kept closed, and the electric valve 1 and the electric valve 4 are opened automatically or manually, so that the wastewater is subjected to ammonia nitrogen electrolysis removal by a water inlet pump through the electrolysis device 1 and the electrolysis device 2 in sequence, and effluent with qualified water quality is obtained; at this time, the electrolysis device 1 is a front-mounted electrolysis device, and the electrolysis device 2 is a rear-mounted electrolysis device;
2) In the running process of the system, the pH value of the effluent is controlled to be below 2 by monitoring the acidity of the effluent after the wastewater passes through the front-end electrolysis device in real time and automatically or manually adjusting the current intensity of the front-end electrolysis device;
3) After the system is operated for a period of time, the rear-mounted electrolysis device has serious relative scaling; the water inflow and the current of the rear-mounted electrolysis device are kept unchanged, and when the voltage of the rear-mounted electrolysis device is monitored to be increased to 120% -125% of the initial state, the system automatically or manually opens the electric valve 2 and the electric valve 3 and closes the electric valve 1 and the electric valve 4; the flow direction of the wastewater is changed by switching a valve, so that the wastewater sequentially passes through the electrolysis device 2 and the electrolysis device 1 by a water inlet pump, the serial connection sequence of the two sets of electrolysis devices is changed, and the scale removal/scaling tendency of the front and rear sets of electrolysis devices is changed;
4) At the moment, the electrolysis device 2 is changed into a prepositive electrolysis device, the electrolysis device operates under the condition of high ammonia nitrogen concentration, the pH is lower, scaling is not easy to occur, and the acid generated in the process of removing the ammonia nitrogen by the electrolysis device automatically scale the electrolysis device 2; meanwhile, the electrolysis device 1 is changed into a rear-mounted electrolysis device, and operates under the condition of low ammonia nitrogen concentration, and the pH is higher and scaling is easy; when the system judges that the voltage of the rear-mounted electrolysis device is increased to 120% -125% of the initial state, the system automatically or manually opens the electric valve 1 and the electric valve 4, closes the electric valve 2 and the electric valve 3, and changes the flowing direction of the wastewater again to carry out pickling descaling … … so as to realize automatic pickling descaling of the whole system without external chemical agents.
The beneficial effects of the invention are as follows: according to the invention, no additional pickling system is required, so that the equipment is simplified, and the construction cost is saved; no additional acid washing chemical agent is added, so that the acid washing cost is reduced. The ammonia nitrogen electrolysis device is not needed to be suspended in the pickling process, and the operation efficiency of the device is improved. The whole pickling operation process is automatically realized by a control system, so that the operability of the device is improved. And the use of strong acid is avoided, and the safety is improved.
Drawings
FIG. 1 is a schematic diagram of a system for pickling an ammonia-containing wastewater electrolyzer.
Detailed Description
The invention is further described below with reference to examples. The following examples are presented only to aid in the understanding of the invention. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Through earlier research, the pH value of the ammonia-containing wastewater in the electrolysis process shows a trend of decreasing before increasing, the minimum pH value can be below 2, and the acidity is very strong. The cause of the pH change was analyzed by the ammonia-containing wastewater electrolysis reaction:
anode reaction: 2Cl - -2e - →Cl 2
Cathode reaction: 2H (H) 2 O+2e - →H 2 +2OH -
The electrolytic product is further reacted with ammonia nitrogen: cl 2 +H 2 O→HClO+HCl，2NH 4 + +3HClO→N 2 ↑+5H + +3Cl - +3H 2 O
Total reaction in the presence of ammonia nitrogen: 2NH 4 + →N 2 ↑+3H 2 +2H + (drop in pH)
Total reaction in the absence of ammonia nitrogen: cl - +2H 2 O→OH - +H 2 ++HClO (pH rising)
By utilizing the process, a system and a method for realizing the acid washing of the ammonia-containing wastewater electrolysis device by adopting a chemical agent-free physical method are developed.
The pickling system of the ammonia-containing wastewater electrolyzer is a brand-new ammonia-containing wastewater electrolyzer, and can realize the function of zero chemical agent pickling.
The pickling method of the ammonia-containing wastewater electrolyzer is a brand-new pickling process, no chemical agent is additionally added, and the control system can realize the effects of pickling and descaling by automatically (or manually) switching the valve. The novel descaling process can be used for synchronously carrying out acid washing and ammonia nitrogen removal, so that the ammonia nitrogen removal efficiency is not affected, and additional time is not required to be reserved.
The pickling system of the ammonia-containing wastewater electrolysis device comprises 2 sets of electrolysis devices, 4 electric valves, 1 online pH meter and equipment (including an inlet-outlet ammonia meter, a flow regulating valve and the like) of the conventional ammonia-containing wastewater electrolysis device, and is free of an independent pickling system. Each set of electrolysis device consists of a water inlet pump and an electrolysis tank (LHB-2 type electrolysis sodium hypochlorite generating device manufactured by Wuhan Xingda company) in sequence, and is provided with an independent hydrogen discharging port. Wherein, the water inlet pump is responsible for providing water delivery power, and the electrolysis trough is responsible for getting rid of ammonia nitrogen. All the electric valves, the flow regulating valves and the electrolysis device are connected with a remote control system, and can manually or automatically read and regulate data at a remote end.
According to the electrolytic reaction mechanism, two sets of electrolytic devices are connected in series: the front-end electrolytic device operates under the condition of high ammonia nitrogen concentration, the pH value is lower, scaling is not easy to occur, and acid generated by the reaction is beneficial to eliminating scale; the post-electrolyzer is operated under the condition of low ammonia nitrogen concentration, the pH value is higher, and calcium and magnesium ions are easy to scale (mainly hydroxides and oxides) in an alkaline environment.
Before the system operates, the electric valve 2 and the electric valve 3 are kept closed, the electric valve 1 and the electric valve 4 are opened automatically (or manually), so that the wastewater is subjected to ammonia nitrogen electrolysis removal by a water inlet pump through the electrolysis device 1 and the electrolysis device 2 in sequence, and effluent with qualified water quality is obtained. In this case, the electrolyzer 1 is a front electrolyzer, and the electrolyzer 2 is a rear electrolyzer. In the running process of the system, the acidity of the effluent after the wastewater passes through the front-end electrolysis device is monitored in real time by an online pH meter, and the current intensity of the front-end electrolysis device is automatically (or manually) regulated to control the pH value of the effluent to be below 2 (according to the electrolysis reaction mechanism, the larger the current is, the more severe the electrolysis reaction is and the more hydrogen ions are generated by the reaction), so as to ensure the pickling effect on the rear-end electrolysis device.
After a period of system operation, the post-electrolyzer (electrolyzer 2) was relatively severely fouled. The inflow and the current of the rear-mounted electrolyzer are kept unchanged, and when the voltage of the rear-mounted electrolyzer is monitored to be increased to 125% of the initial state, the system automatically (or manually) opens the electric valves 2 and 3 and closes the electric valves 1 and 4. The flow direction of the wastewater is changed by switching the valve, so that the wastewater sequentially passes through the electrolytic device 2 and the electrolytic device 1 by the water inlet pump, the serial connection sequence of the two sets of electrolytic devices is changed, and the scaling/descaling tendency of the front electrolytic device and the rear electrolytic device is also changed.
At this time, the electrolysis device 2 becomes a front-end electrolysis device, operates under the condition of high ammonia nitrogen concentration, has lower pH value and is not easy to scale, and the acid generated in the process of removing the electrolytic reaction of the ammonia nitrogen by the set of electrolysis device can automatically scale the electrolysis device 2. Meanwhile, the electrolysis device 1 is changed into a post-electrolysis device, and operates under the condition of low ammonia nitrogen concentration, and the pH is higher and scaling is easy. When the system judges that the voltage of the rear-mounted electrolysis device (the electrolysis device 1) rises to 125% of the initial state, the system automatically (or manually) opens the electric valve 1 and the electric valve 4, closes the electric valve 2 and the electric valve 3, and changes the flowing direction of the wastewater again to carry out pickling descaling … … so as to realize automatic pickling descaling without external chemical agents of the whole system.
By using the equipment and the matched process, the automatic acid washing and descaling of the whole system without additional chemical agents can be realized. The pickling process does not need to pause an electrolysis device, pickling and ammonia nitrogen removal can be performed simultaneously, and the pickling cannot have negative influence on the ammonia nitrogen removal effect of the system. Acid generated in the electrolytic reaction of the ammonia nitrogen wastewater is used as an acid washing agent to carry out acid washing and descaling on scaling on the electrode plate of the electrolytic tank. The change of the flow direction of the wastewater can be automatically judged and operated by the control system, and the pickling effect can be automatically estimated by the control system through the electrolysis voltage, the electrolysis current and the wastewater flow rate.
Examples:
a certain coal-fired power plant adopts an electrochemical oxidation method to treat the mixed wastewater of the refined regenerated wastewater and the desulfurization wastewater, the ammonia nitrogen concentration of the wastewater reaches more than 100mg/L, and the total hardness reaches more than 100 mg/L. At present, the electrolyzer is pickled once every 2 months, and 5-8% of dilute hydrochloric acid is used in the pickling process, so that the dosage of the medicament is large, and the low-pH pickling wastewater is easy to pollute the environment.
And then the electrolysis device and the control process are technically modified, the two-stage electrolysis devices are connected in series and are provided with electric switching valves, so that the flow direction of the wastewater can be adjusted through switching the valves. An online pH meter is additionally arranged between the two-stage electrolytic devices, so that the acidity of the pickling solution can be conveniently adjusted, and the pickling capacity and the pickling speed can be controlled.
The flow rate of the wastewater is kept to be 2t/h, the device is used for continuously treating ammonia nitrogen wastewater, and the pH value of the effluent of the front-end electrolysis device is always kept to be less than 2. After 51 days, the voltage of the post-electrolyzer was gradually increased from 51V to 64V to trigger a fouling alarm. And (5) manually switching the corresponding valve to enable the wastewater to reversely flow, and carrying out pickling and descaling. Within three days, the original scale electrolyzer voltage steadily fell to normal level (53V), indicating effective pickling scale removal.
In this example, descaling and pickling of the scale-setting device is achieved without any chemical agents added. The pickling and ammonia nitrogen removal can be synchronously carried out, and the ammonia nitrogen removal effect of the system is not affected during the pickling. The above results indicate that the device and the process have practical feasibility.
Claims (1)
1. The system for pickling the ammonia-containing wastewater electrolyzer is characterized by comprising an electrolyzer, an electric valve, an online pH meter, an inlet and outlet ammonia meter and a flow regulating valve; the ammonia-containing wastewater inlet is provided with a flow regulating valve and an inlet ammonia meter, and the outlet is provided with an outlet ammonia meter; the front-mounted electrolyzer is connected in series with the rear-mounted electrolyzer, an online pH meter is arranged between the two sets of electrolyzer, and the pH value of the solution in the front-mounted electrolyzer is lower than that in the rear-mounted electrolyzer; two ports of the two sets of electrolytic devices are respectively provided with an electric valve; all the electric valves, the flow regulating valves and the electrolysis device are connected to a remote control system; the ammonia-containing wastewater flows in from a flow regulating valve and an inlet ammonia meter, sequentially flows through an electric valve, a front-mounted electrolysis device, an online pH meter, a rear-mounted electrolysis device and the electric valve, and flows out from an outlet ammonia meter to form product water; each set of electrolysis device consists of a water inlet pump and an electrolysis bath in sequence and is provided with an independent hydrogen discharge port; the electrolysis device is divided into an electrolysis device 1 and an electrolysis device 2, wherein an electric valve 1 and an electric valve 2 are respectively arranged at two ports of the electrolysis device 1, and an electric valve 3 and an electric valve 4 are respectively arranged at two ports of the electrolysis device 2; when the electrolysis device 1 is used as a front-mounted electrolysis device and the electrolysis device 2 is used as a rear-mounted electrolysis device, the electric valve 1, the electrolysis device 1, the online pH meter, the electrolysis device 2 and the electric valve 4 are sequentially connected in series; when the electrolysis device 2 is used as a front-mounted electrolysis device and the electrolysis device 1 is used as a rear-mounted electrolysis device, the electric valve 3, the electrolysis device 2, the online pH meter, the electrolysis device 1 and the electric valve 2 are sequentially connected in series;
an acid cleaning method of an acid cleaning system of an ammonia-containing wastewater electrolysis device comprises the following steps:
1) Before the system runs, firstly, the electric valve 2 and the electric valve 3 are kept closed, and the electric valve 1 and the electric valve 4 are opened automatically or manually, so that the wastewater is subjected to ammonia nitrogen electrolysis removal by a water inlet pump through the electrolysis device 1 and the electrolysis device 2 in sequence, and effluent with qualified water quality is obtained; at this time, the electrolysis device 1 is a front-mounted electrolysis device, and the electrolysis device 2 is a rear-mounted electrolysis device;
2) In the running process of the system, the pH value of the effluent is controlled to be below 2 by monitoring the acidity of the effluent after the wastewater passes through the front-end electrolysis device in real time and automatically or manually adjusting the current intensity of the front-end electrolysis device;
3) After the system is operated for a period of time, the rear-mounted electrolysis device has serious relative scaling; the water inflow and the current of the rear-mounted electrolysis device are kept unchanged, and when the voltage of the rear-mounted electrolysis device is monitored to be increased to 120% -125% of the initial state, the system automatically or manually opens the electric valve 2 and the electric valve 3 and closes the electric valve 1 and the electric valve 4; the flow direction of the wastewater is changed by switching a valve, so that the wastewater sequentially passes through the electrolysis device 2 and the electrolysis device 1 by a water inlet pump, the serial connection sequence of the two sets of electrolysis devices is changed, and the scale removal/scaling tendency of the front and rear sets of electrolysis devices is changed;
4) At the moment, the electrolysis device 2 is changed into a prepositive electrolysis device, the electrolysis device operates under the condition of high ammonia nitrogen concentration, the pH is lower, scaling is not easy to occur, and the acid generated in the process of removing the ammonia nitrogen by the electrolysis device automatically scale the electrolysis device 2; meanwhile, the electrolysis device 1 is changed into a rear-mounted electrolysis device, and operates under the condition of low ammonia nitrogen concentration, and the pH is higher and scaling is easy; when the system judges that the voltage of the rear-mounted electrolysis device is increased to 120% -125% of the initial state, the system automatically or manually opens the electric valve 1 and the electric valve 4, closes the electric valve 2 and the electric valve 3, and changes the flowing direction of the wastewater again to carry out pickling descaling … … so as to realize automatic pickling descaling of the whole system without external chemical agents.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3341441A (en) * | 1964-01-07 | 1967-09-12 | Ionics | Method for preventing scale buildup during electrodialysis operation |
| CN101198551A (en) * | 2005-04-15 | 2008-06-11 | 三菱重工业株式会社 | Method of electrolyzing wastewater containing ammonia nitrogen and apparatus therefor |
| WO2019014781A1 (en) * | 2017-07-18 | 2019-01-24 | Investigaciones Forestales Bioforest S.A. | Method and device for asymmetric polarity inversion in electromembrane processes |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3341441A (en) * | 1964-01-07 | 1967-09-12 | Ionics | Method for preventing scale buildup during electrodialysis operation |
| CN101198551A (en) * | 2005-04-15 | 2008-06-11 | 三菱重工业株式会社 | Method of electrolyzing wastewater containing ammonia nitrogen and apparatus therefor |
| WO2019014781A1 (en) * | 2017-07-18 | 2019-01-24 | Investigaciones Forestales Bioforest S.A. | Method and device for asymmetric polarity inversion in electromembrane processes |
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