CN210764774U - Cold rolling waste water desalination system - Google Patents
Cold rolling waste water desalination system Download PDFInfo
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- CN210764774U CN210764774U CN201921424915.XU CN201921424915U CN210764774U CN 210764774 U CN210764774 U CN 210764774U CN 201921424915 U CN201921424915 U CN 201921424915U CN 210764774 U CN210764774 U CN 210764774U
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Abstract
The utility model provides a cold rolling waste water desalination system, cold rolling waste water desalination system includes, equalizing basin, filter, electric adsorption equipment, dense water neutralization pond, dense pond, product water neutralization pond, product pond and the control unit. When the electric adsorption device is electrified, the control unit is used for controlling the wastewater to pass through the regulating tank, the filter, the electric adsorption device, the concentrated water neutralizing tank and the concentrated water tank and then discharging partial salt-containing water; the control unit is used for controlling the wastewater to pass through the regulating reservoir, the filter, the electric adsorption device, the produced water neutralizing pool and the produced water pool to obtain recycled water. The utility model provides a system not only can effectively get rid of the ion in the waste water, and COD index enrichment concentration is low moreover, realizes the desalination retrieval and utilization of waste water, satisfies COD and discharges the index requirement, need not set up solitary dense water and handles the device.
Description
Technical Field
The utility model belongs to the technical field of the water treatment technique and specifically relates to a cold rolling waste water desalination system is related to.
Background
Under the current large background that freshwater resources are scarce and low-carbon economy is advocated globally, the discharge standard of wastewater is more and more strict, especially the steel industry with high energy consumption and high discharge, and whether the wastewater discharge meets the standard or not has important significance in the work of energy conservation and emission reduction advocated by the global low-carbon economy. Among them, the discharge standard of water pollutants for the steel industry (GB13456-2012) not only provides a plurality of discharge indexes of cold rolling wastewater, such as COD (Chemical Oxygen Demand), SS (Suspended solid concentration), etc., but also further restricts the discharge amount of wastewater per ton of steel, which means that a plurality of cold rolling wastewater treatment stations need to perform wastewater desalination recycling/modification.
In the prior art, in the technical field of wastewater treatment, the most common desalination recycling process is a membrane desalination process, but the process has the following problems in the field of wastewater recycling: firstly, the requirement on the quality of inlet water is high, the COD of the concentrated water is easy to enrich, and secondly, an independent concentrated water treatment unit is required to be arranged.
It is to be noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the invention, and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems of high requirement on water quality and easy enrichment of concentrated water COD in the prior art, and provides a cold rolling wastewater desalination system.
In order to achieve the purpose, the utility model discloses a cold rolling waste water desalination system is realized through following technical scheme, including equalizing basin, filter, electric adsorption equipment, dense water neutralization pond, dense water pond, product water neutralization pond, product water pond and control unit;
the water outlet of the regulating tank is communicated with the water inlet of the filter, and the water outlet of the filter is communicated with the first water inlet of the electric adsorption device;
a first water outlet of the electro-adsorption device is communicated with a water inlet of the concentrated water neutralization tank, and a water outlet of the concentrated water neutralization tank is communicated with a water inlet of the concentrated water tank;
a second water outlet of the electro-adsorption device is communicated with a water inlet of the produced water neutralization tank, and a water outlet of the produced water neutralization tank is communicated with a water inlet of the produced water tank;
when the electric adsorption device is electrified, the control unit is used for controlling the wastewater to pass through the regulating tank, the filter, the electric adsorption device, the concentrated water neutralizing tank and the concentrated water tank and then discharging partial salt-containing water;
or/and
when the electric adsorption device is electrified, the control unit is used for controlling the wastewater to pass through the regulating reservoir, the filter, the electric adsorption device, the produced water neutralizing pool and the produced water pool to obtain recycled water.
Optionally, the electric adsorption device includes a plurality of electric adsorption modules, and a plurality of channels are formed between the polar plates of the plurality of electric adsorption modules;
when the electric adsorption module is electrified, the surface of the polar plate becomes a double-electric layer, and when salt-containing wastewater passes through the channel, ions in the salt-containing wastewater can be adsorbed or trapped on the surface of the polar plate.
Optionally, when the power is applied, OH hydroxyl radicals are formed on the surface of the polar plate, and the OH hydroxyl radicals can oxidize organic matters in the wastewater.
Optionally, the device further comprises a middle water tank, a water inlet of the middle water tank is communicated with a third water outlet of the electric adsorption device, and a water outlet of the middle water tank is communicated with a water inlet of the filter;
the water outlet of the middle water pool and the water outlet of the regulating pool are communicated with the water inlet of the filter through a tee joint;
when the electric adsorption device is powered off, the control unit is also used for controlling the acid adding regeneration, the reclaimed water regeneration and/or the raw water regeneration of the electric adsorption device;
wherein the content of the first and second substances,
the acid adding regeneration comprises that the control unit is used for enabling the wastewater to pass through the middle water tank, the filter, the electric adsorption device, the concentrated water neutralization tank and the concentrated water tank, and hydrochloric acid is added before the wastewater enters the electric adsorption device, so that the electric adsorption device is regenerated;
the reclaimed water regeneration comprises that the control unit is used for controlling the wastewater to pass through the reclaimed water tank, the filter, the electric adsorption device, the concentrated water neutralization tank and the concentrated water tank so that the electric adsorption device is regenerated;
the raw water regeneration comprises that the control unit is used for controlling the wastewater to pass through the regulating reservoir, the filter, the electric adsorption device and the reclaimed water tank, so that the electric adsorption device is regenerated.
Optionally, the cleaning device further comprises a cleaning tank, a first water outlet of the cleaning tank is communicated with a second water inlet of the electro-adsorption device, and a first water inlet of the cleaning tank is communicated with a fourth water outlet of the electro-adsorption device;
the control unit is also used for controlling the cleaning of the electric adsorption device, and the cleaning comprises the following operations which are executed in a circulating mode until the cleaning of the electric adsorption device is completed: discharging a cleaning solution from the cleaning tank to the electro-adsorption device, soaking and cleaning the electro-adsorption device, and discharging the cleaning solution from the electro-adsorption device to the cleaning tank;
and after the electric adsorption device finishes cleaning, the cleaning waste liquid is discharged to the cleaning box.
Optionally, the device further comprises a plurality of automatic valves, wherein the automatic valves are respectively arranged at a first water inlet, a second water inlet, a first water outlet, a second water outlet and a third water outlet of the electric adsorption device;
the control unit is also used for controlling the yield and the water quality of the partial salt-containing water, the yield and the water quality of the reuse water, the regeneration of the electric adsorption device and/or the cleaning of the electric adsorption device by controlling the opening and closing time lengths of the automatic valves.
Optionally, the automatic valve comprises a pneumatic valve and/or an electric valve.
Optionally, the filter comprises a self-cleaning filter and/or a canister filter.
Optionally, the filtering precision of the filtered request comprises 5m to 100 μm.
Optionally, the electro-adsorption device comprises a roll-to-roll electro-adsorption module and/or a plate-type electro-adsorption module.
The utility model has the advantages that: the cold rolling wastewater desalination system provided by the utility model has simple structure and easy control; and an 'electro-adsorption device' is adopted as a core device to carry out cold rolling wastewater treatment, so that the desalting of wastewater and the removal of organic matters can be realized in a synergistic manner, and the recycling of produced water is realized. Further, utilize the utility model provides a pair of dense water that cold rolling waste water desalination system produced compares with the dense water of traditional embrane method, does not have the condition of organic matter enrichment, consequently can save corresponding dense water and deal with the unit, shortens the processing of system or deals with the flow.
Drawings
FIG. 1 is a schematic structural diagram of a cold rolling wastewater desalination system according to a first embodiment of the present invention;
fig. 2 is a schematic structural view of an electric adsorption device control valve of a cold rolling wastewater desalination system according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for removing salt from cold rolling wastewater according to a second embodiment of the present invention;
fig. 4 is a schematic view of the operation cycle step sequence of the electric adsorption device according to the second embodiment of the present invention;
wherein the reference numerals of figures 1-4 are as follows:
100-regulating reservoir, 200-filter, 300-electric adsorption device;
400-concentrated water neutralization tank, 500-concentrated water tank, 600-produced water neutralization tank and 700-produced water tank;
800-middle water pool, 900-cleaning box and 1000-control unit;
v11-a first water inlet valve, V12-a second water inlet valve, V21-a first water outlet valve, V22-a second water outlet valve and V23-a third water outlet valve;
p10-water inlet pump, P20-medium water pump; p30-hydrochloric acid pump.
Detailed Description
The core thought of the utility model is to provide a cold rolling waste water desalination system, not only can effectively get rid of the example in the waste water, realize the desalination retrieval and utilization of waste water, COD index enrichment concentration is low moreover, satisfies the requirement that COD discharged the index, and further, need not set up solitary dense water treatment facilities.
In order to realize the thought, the utility model provides a cold rolling wastewater desalination system, which comprises an adjusting tank, a filter, an electric adsorption device, a concentrated water neutralization tank, a concentrated water tank, a produced water neutralization tank, a produced water tank and a control unit; the water outlet of the regulating tank is communicated with the water inlet of the filter, and the water outlet of the filter is communicated with the first water inlet of the electric adsorption device; a first water outlet of the electro-adsorption device is communicated with a water inlet of the concentrated water neutralization tank, and a water outlet of the concentrated water neutralization tank is communicated with a water inlet of the concentrated water tank; a second water outlet of the electro-adsorption device is communicated with a water inlet of the produced water neutralization tank, and a water outlet of the produced water neutralization tank is communicated with a water inlet of the produced water tank; when the electric adsorption device is electrified, the control unit is used for controlling the wastewater to pass through the regulating tank, the filter, the electric adsorption device, the concentrated water neutralizing tank and the concentrated water tank and then discharging partial salt-containing water;
or/and
when the electric adsorption device is electrified, the control unit is used for controlling the wastewater to pass through the regulating reservoir, the filter, the electric adsorption device, the produced water neutralizing pool and the produced water pool to obtain recycled water.
To make the objects, advantages and features of the present invention clearer, a system for removing salt from cold rolling wastewater according to the present invention will be described in detail with reference to fig. 1-4. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention. It should be understood that the drawings are not necessarily to scale, showing the particular construction of the invention, and that the illustrative features in the drawings, which are used to illustrate certain principles of the invention, are also somewhat simplified. Specific design features of the invention disclosed herein, including, for example, specific dimensions, orientations, locations, and configurations, will be determined in part by the particular intended application and environment of use. In the embodiments described below, the same reference numerals are used in common between different drawings to denote the same portions or portions having the same functions, and a repetitive description thereof will be omitted. In this specification, like reference numerals and letters are used to designate like items, and therefore, once an item is defined in one drawing, further discussion thereof is not required in subsequent drawings.
< example one >
The embodiment provides a cold rolling wastewater desalination system, which is shown in fig. 1 and comprises a regulating reservoir 100, a filter 200, an electro-adsorption device 300, a concentrated water neutralizing reservoir 400, a concentrated water reservoir 500, a produced water neutralizing reservoir 600, a produced water reservoir 700 and a control unit 1000. Wherein, the water outlet (not shown in the figure) of the regulating reservoir 100 is communicated with the water inlet (not shown in the figure) of the filter 200, and the water outlet (not shown in the figure) of the filter 200 is communicated with the first water inlet (not shown in the figure) of the electro-adsorption device 300; a first water outlet (not shown in the figure) of the electro-adsorption device 300 is communicated with a water inlet (not shown in the figure) of the concentrated water neutralization tank 400, and a water outlet (not shown in the figure) of the concentrated water neutralization tank 400 is communicated with a water inlet (not shown in the figure) of the concentrated water tank; a second water outlet (not shown in the figure) of the electro-adsorption device 300 is communicated with a water inlet (not shown in the figure) of the water production neutralization tank 600, and a water outlet (not shown in the figure) of the water production neutralization tank 600 is communicated with a water inlet (not shown in the figure) of the water production tank 700. The control unit 1000 is used for controlling the circulation route of the cold rolling wastewater among the functional components and the residence time of the functional components.
In particular, the respective water inlet (not shown) and water outlet (not shown) mentioned herein are only used for assisting the description of the circulation route of the cold rolling wastewater between the two functional water pools, and do not explicitly or implicitly indicate whether the functional water pools actually have the corresponding water inlet and water outlet, for example, the first water outlet and the second water outlet of the electro-adsorption device 300, in one embodiment, only communicate/block with the concentrated water neutralization tank 400 and the produced water neutralization tank 600 by a three-way manner, rather than physically having two water outlets of the electro-adsorption device 300; obviously, in other embodiments, it is within the scope of the present invention that the two water outlets are physically present in the electric adsorption device 300.
In the present embodiment, the filter 200 is a self-cleaning filter, and preferably has a filtering precision of 5 μm to 100 μm. In other embodiments, the filter 200 can be a self-cleaning filter and/or a canister filter; the filter 200 can remove impurities in the wastewater, and ensure the quality of the inlet water and the regeneration water of the electro-adsorption device 300, so that the electro-adsorption device 300 can stably operate.
Further, with continued reference to fig. 1, the electro-adsorption device 300 includes An electro-adsorption module a1, An electro-adsorption module a2, …, An N electro-adsorption modules, and a plurality of channels are formed between the plates of the N electro-adsorption modules, when the N electro-adsorption modules are powered on, surfaces of the plates form a double-electrical layer, and when the saline wastewater passes through the channels between the plates, ions in the saline wastewater can be adsorbed or trapped on the surfaces of the plates under the action of the dc electric field, so that not only can the salt content in the saline wastewater be reduced, but also partial saline water can be discharged, and the desalination of the saline wastewater can be realized, so that the wastewater with poor water quality can be recycled; further, under the action of a strong electric field, OH free radicals with strong oxidizability can be produced on the surface of the polar plate, and can synergistically degrade and remove part of organic matters in the wastewater, so that the indexes of the organic matters in the wastewater are reduced. Wherein, the electric adsorption module is a roll type electric adsorption module or a plate type electric adsorption module.
Preferably, a stirrer and a sodium hydroxide agent adding point are arranged in the concentrated water neutralizing tank 400, so that the pH value of the concentrated water of the system is ensured to be stabilized between 6 and 9; the concentrated water tank is used for collecting the neutralized concentrated water, and in other embodiments, the cold rolling wastewater desalination system further comprises a water pump matched with the concentrated water tank 500 and used for discharging the concentrated water in the concentrated water tank 500 to a specified system; a stirrer and a sodium hydroxide adding point are arranged in the produced water neutralizing tank 600, so that the pH of the produced water of the system is ensured to be stabilized between 6 and 9; the water producing tank 700 is used for collecting neutralized water, and in other embodiments, the cold rolling wastewater desalination system further comprises a water pump matched with the water producing tank 700 and used for conveying the water produced in the water producing tank 700 to a designated system.
In the cold rolling wastewater desalination system provided by this embodiment, when the electro-adsorption device 300 is powered on, the control unit 1000 is configured to control wastewater to pass through the adjusting tank 100, the filter 200, the electro-adsorption device 300, the concentrated water neutralization tank 400, and the concentrated water tank 500 and then discharge a part of the saline water. Preferably, the cold rolling wastewater treatment system further comprises a conductivity meter disposed on a water production mother pipe of the electro-adsorption device 300. The control unit 1000 considers that the electro-adsorption device 300 discharges a part of saline water according to the fact that the indication value of the conductivity meter is within the first set threshold value range. For the convenience of description, the whole process from the cold rolling waste water to the discharge of part of the salt-containing water is referred to as step 1.
Further, after the step 1 is operated for a first set time, if the value indicated by the conductivity meter is within a second set threshold range, the water produced by the electro-adsorption device 300 is considered as the desalted water which can be recycled. At this time, similarly, when the electric adsorption device 300 is powered on, the control unit 1000 is further configured to control the wastewater to pass through the adjusting tank 100, the filter 200, the electric adsorption device 300, the produced water neutralization tank 600, and the produced water tank 700 to realize desalination and reuse of the wastewater. Also, for the convenience of description, the whole process from the cold rolling waste water to the discharge of the reuse water is referred to as step 2.
Further, the cold rolling wastewater desalination system provided by this embodiment further includes a middle water tank 800, and referring to fig. 1 again, a water inlet (not shown in the figure) of the middle water tank 800 is communicated with a third water outlet (not shown in the figure) of the electro-adsorption device 300, a water outlet (not shown in the figure) of the middle water tank 800 is communicated with a water inlet (not shown in the figure) of the filter 200, wherein the water outlet of the middle water tank 800 and the water outlet of the regulating tank 100 are communicated with the water inlet of the filter 200 through a tee.
After the wastewater treatment step 2 is executed for the second set time, the ability of the electro-adsorption device 300 to adsorb ions is decreased, that is, the desalination rate is decreased, which is shown in that the indicated value of the water-producing conductivity meter of the electro-adsorption device 300 exceeds the set third threshold range, the adsorption ability of the plate of the electro-adsorption device 300 tends to be saturated, and at this time, the electro-adsorption device 300 needs to be regenerated. In this embodiment, the electric adsorption device 300 is first powered off, and the positive and negative electrodes of the polar plates of the electric adsorption device 300 are short-circuited, so that ions adsorbed or trapped on the surfaces of the polar plates of the electric adsorption modules are returned to the channel between the polar plates again, and the regeneration of the electrodes is realized along with the discharge of water flow. The regeneration of the electro-adsorption device 300 is performed by the following steps: acid adding regeneration, reclaimed water regeneration and/or raw water regeneration.
Specifically, the acid addition regeneration comprises the following processes: the control unit 1000 controls a first water pump to pump water in the reclaimed water pool 800, after the water is filtered by the filter 200, acid is added into a subsequent pipeline by using a pipeline mixer to form any value of the pH value of an acid solution within a range of 2-3, the electro-adsorption device 300 is subjected to acid washing regeneration, and wastewater discharged from the electro-adsorption device 300 is sent to the concentrated water neutralization pool 400 and the concentrated water pool 500, preferably, referring to fig. 2, the cold rolling wastewater desalination system provided in this embodiment further includes the first water pump, which is a reclaimed water pump P20, and is used for pumping reclaimed water in the reclaimed water pool 800; preferably, in other embodiments, the cold rolling wastewater desalination system further comprises a hydrochloric acid pump P30, and the hydrochloric acid pump P30 is configured to pump hydrochloric acid from a hydrochloric acid tank, so that the hydrochloric acid is mixed with water filtered by the filter 200 to form an acid solution, and the acid solution is regenerated for the electro-adsorption device 300.
Specifically, the reclaimed water regeneration includes a process in which the control unit 1000 is configured to control the reclaimed water pump P20 to pump the wastewater in the reclaimed water tank 800, filter the wastewater by the filter 200, and perform flushing regeneration on the electro-adsorption module of the electro-adsorption device 300, so that the wastewater discharged from the electro-adsorption device 300 passes through the concentrated water neutralization tank 400 to reach the concentrated water tank 500.
Specifically, the raw water regeneration includes a process in which the control unit 1000 is configured to control a second water pump to pump the wastewater in the adjusting tank 100, and after the wastewater is filtered by the filter 200, the electro-adsorption module of the electro-adsorption device 300 is subjected to flushing regeneration, and the wastewater discharged from the electro-adsorption device 300 is sent to the reclaimed water tank 800 for acid regeneration and/or reclaimed water regeneration in a next cycle, so as to improve a recovery rate of the system. Preferably, referring to fig. 2, the system for removing salt from cold rolling wastewater provided by this embodiment further includes the second water pump, which is a water inlet pump P10, for pumping wastewater from the regulating reservoir 100.
Preferably, when the electric adsorption device 300 is regenerated for the first time, the primary water replenishing water source of the intermediate water pool 800 comes from the regulating pool 100, and the primary water replenishing refers to the waste water used for the regeneration of the electric adsorption device 300; the water source for replenishing water is the concentrated water regenerated by the electric adsorption device 300.
Still further, the treatment module 1000 is further configured to control a retention time of the concentrated water in the concentrated water neutralization tank 400, and in one embodiment, the retention time of the concentrated water in the concentrated water neutralization tank 400 is 5 to 20 minutes; similarly, the treatment module 1000 is further configured to control the retention time of the produced water in the produced water neutralization tank 600, and the retention time of the produced water in the produced water neutralization tank 600 is 5-20 minutes.
Preferably, the treatment module 1000 is further configured to control the wastewater to first homogenize the water quality and the water quantity in the adjusting tank 100 during the steps 1 and 2 and the raw water regeneration.
As can be seen from this, the electro-adsorption device 300 of the cold rolling wastewater desalination system provided by the present embodiment not only has regeneration capability; compared with the concentrated water produced by the traditional membrane method, the concentrated water produced by the cold rolling wastewater desalination system has no condition of organic matter enrichment, so that a corresponding concentrated water treatment unit can be omitted, not only are the components of the treatment system saved, but also the treatment flow or the treatment flow of the system is greatly shortened. In particular, when system recovery requirements are low, the regeneration water source may be entirely from the conditioning tank 100, eliminating the mid-water tank 800.
Further, the cold rolling wastewater desalination system provided by this embodiment further includes a cleaning tank 900, a first water outlet (not shown in the figure) of the cleaning tank 900 is communicated with a second water inlet (not shown in the figure) of the electro-adsorption device 300, and a first water inlet (not shown in the figure) of the cleaning tank 900 is communicated with a fourth water outlet (not shown in the figure) of the electro-adsorption device 300. Preferably, the control unit 1000 is further configured to control the cleaning of the electro-adsorption device 300. Specifically, in this embodiment, after the cold rolling wastewater desalination system operates the step 1, the step 2 and/or the electro-adsorption device 300 for a plurality of cycles, the electro-adsorption device 300 needs to be cleaned to recover the desalination function. The general process is that the electric adsorption device 300 is powered off, the control unit 1000 controls the cleaning liquid to be discharged from the cleaning box 900 to the electric adsorption device 300, the cleaning liquid soaks and cleans the electric adsorption device 300 in a circulating way, the scale attached to the polar plate of the electric adsorption module of the electric adsorption device 300 is dissolved and removed, and the ion adsorption function of the polar plate is recovered. The cleaning solution is diluted into a dilute hydrochloric acid solution with any concentration value in a concentration range of 2% -4% by supplementing industrial water. Further, during the cleaning process, the effective acid concentration of the cleaning solution is maintained until the cleaning of the electro-adsorption device 300 is completed. In this example, when the acid concentration of the washing is stable, no more stable decrease is considered as the washing is completed. Further, the control unit 1000 controls the electro-adsorption device 300 to discharge the cleaning waste liquid to the cleaning tank 900, so as to realize the cyclic utilization of the cleaning liquid, and thus the electro-adsorption device 300 performs cyclic soaking and cleaning on the electro-adsorption template; still further, the cleaning tank 900 further has a second water outlet (not shown in the figure), when the electro-adsorption device 300 is cleaned, a cleaning waste liquid is discharged to the cleaning tank 900, and the cleaning waste liquid is discharged to a wastewater treatment system through the second water outlet of the cleaning tank 900.
Further, as shown in fig. 2, in other embodiments, the adsorption device of the cold rolling wastewater desalination system further includes a plurality of automatic valves, and the automatic valves are respectively disposed at the first water inlet, the second water inlet, the first water outlet, the second water outlet, and the third water outlet of the electric adsorption device 300.
Specifically, in one embodiment, the first water inlet valve V11 is installed at the water inlet of the filter 200, and the opening/closing of the first water inlet valve V11 enables the outlet water of the regulating reservoir 100 to be communicated/blocked with the filter 300; the wastewater is filtered by the filter 200 and then enters the electro-adsorption device 300. Further, the water inlet pump P10 is provided between the first water inlet valve V11 and the regulating reservoir 100. As one embodiment of the present invention, in the step 1, the step 2 and the raw water regeneration, the first water inlet valve V11 is in an open state; the first water inlet valve V11 is in a closed state at the time of the acidification regeneration, the reclaimed water regeneration and the washing of the electro-adsorption device 300.
The second water inlet valve V12 is installed at the water inlet of the filter 200, and the opening/closing of the second water inlet valve V12 enables the water outlet of the middle water pool 100 to be communicated/blocked with the filter 200; the wastewater is filtered by the filter 200 and then enters the electro-adsorption device 300. Further, the reclaimed water pump P20 is arranged between the second water inlet valve V12 and the reclaimed water pool 800. The second water inlet valve V12 is in an open state during the acid adding regeneration and the reclaimed water regeneration; in the step 1, the step 2, the raw water regeneration, and the cleaning of the electro-adsorption device 300, the second water inlet valve V12 is in a closed state.
The first water outlet valve V21 is installed at the first water outlet of the electro-adsorption device 300, and the opening/closing of the first water outlet valve V21 enables the water outlet of the electro-adsorption device 300 to be communicated/blocked with the concentrated water neutralization tank 400. The first water outlet valve V21 is in an open state during the step 1, the acid adding regeneration and the reclaimed water regeneration; in the step 2, the raw water is regenerated and the electro-adsorption device 300 is cleaned, the first outlet valve V21 is in a closed state.
The second water outlet valve V22 is installed at the second water outlet of the electro-adsorption device 300, and the opening/closing of the second water outlet valve V22 enables the water outlet of the electro-adsorption device 300 to be communicated/blocked with the produced water neutralization tank 600. In the step 2, the second water outlet valve V22 is in an open state; in the step 1, the acid adding regeneration, the reclaimed water regeneration, the raw water regeneration, and the cleaning of the electro-adsorption device 300, the second water outlet valve V22 is in a closed state.
The third outlet valve V23 is installed at the third outlet of the electro-adsorption device 300, and the opening/closing of the third outlet valve V23 allows the outlet of the electro-adsorption device 300 to communicate/block with the middle water pool 800. When the raw water is regenerated, the third water outlet valve V23 is in an open state; the third water outlet valve V23 is in a closed state during the step 1, the step 2, the acid adding regeneration, the reclaimed water regeneration and the cleaning of the electro-adsorption device 300.
In particular, the present invention does not limit the types of the above-mentioned automatic valves, including pneumatic valves and/or electric valves.
Further, the control unit 1000 is further configured to control the on/off duration of the automatic valves, so as to control the yield and quality of the partial salt-containing water, the yield and quality of the reuse water, the regeneration of the electro-adsorption device, and/or the cleaning of the electro-adsorption device.
The water amount of certain cold rolling wastewater is 190m3In the item of/h, the water quality after pretreatment is pH 6-9, CODcr < 30mg/L, conductivity < 4500 mus/cm, suspended matter < 10mg/L, Ca2+ < 700mg/L, SO42- < 100mg/L, and the cold rolling wastewater is desalted by a system shown in figure 1. After the stable operation of the last year, the water quality indexes of the produced water of the system are that the pH is 6-9, the CODcr is less than 30mg/L, the conductivity is less than 1400 mu s/cm, and the suspended matters are less than 10 mg/L; the water quality indexes of the concentrated water are that the pH is 6-9, the CODcr is less than 30mg/L, and the suspended solids are less than 10mg/L, and the discharge requirements of the table 3 of the discharge standard of pollutants for water in the iron and steel industry GB13456-2012) are met; system for controlling a power supplyThe recovery rate is stabilized at about 80%. Therefore, the utility model provides a pair of cold rolling waste water desalination system when realizing the desalination of waste water and the removal in coordination of organic matter, provides the rate of recovery greatly.
< example two >
In order to further show how to use the utility model provides a cold rolling waste water desalination system, this embodiment provides a cold rolling waste water desalination method, refer to fig. 3, include:
step 1: controlling the wastewater to sequentially pass through the regulating tank, the filter, the electrified electro-adsorption device and a concentrated water neutralizing tank, and discharging partial salt-containing water;
step 2: controlling the wastewater to sequentially pass through the regulating reservoir, the filter, the electrified electro-adsorption device, the produced water neutralizing reservoir and the produced water reservoir to obtain recycled water;
and step 3: de-energizing the electro-adsorption device, regenerating the electro-adsorption device;
and step 1 to step 3 are periodically executed.
Wherein, the regeneration of the electro-adsorption device comprises acid regeneration, reclaimed water regeneration and/or raw water regeneration. Specifically, the acid addition regeneration comprises: controlling the wastewater to pass through the middle water tank, the filter, the electro-adsorption device, the concentrated water neutralization tank and the concentrated water tank, and adding hydrochloric acid before the wastewater enters the electro-adsorption device to regenerate the electro-adsorption device; the reclaimed water regeneration comprises the following steps: controlling the wastewater to pass through the middle water tank, the filter, the electro-adsorption device, the concentrated water neutralization tank and the concentrated water tank, and regenerating the electro-adsorption device; the raw water regeneration comprises the step of controlling the wastewater to pass through the regulating reservoir, the filter, the electric adsorption device and the reclaimed water tank, and regenerating the electric adsorption device.
Preferably, in step S1, the residence time of the concentrated water in the concentrated water neutralization tank may also be set, such as 5 to 10 minutes; and sodium hydroxide is added into the concentrated water neutralization tank, so that the pH value of the concentrated water is ensured to be stabilized within a certain range, such as: the pH value is stabilized between 6 and 9; similarly, in step S2, the retention time of the produced water in the produced water neutralization pond may be set, for example, 5 to 10 minutes; and adding sodium hydroxide into the produced water neutralization pond to ensure that the pH value of the concentrated water is stabilized within a certain range, such as the pH value is stabilized between 6 and 9.
Further, after the operation of the plurality of periods, the electric adsorption device is cleaned. Powering off the electric adsorption device and cleaning the electric adsorption device, wherein the following operations are executed in a circulating mode until the electric adsorption device is cleaned: discharging a cleaning solution from a cleaning tank to the electro-adsorption device, soaking and cleaning the electro-adsorption device, and discharging the cleaning solution from the electro-adsorption device to the cleaning tank; and after the electric adsorption device finishes cleaning, the cleaning waste liquid is discharged to the cleaning box. The cleaning solution is prepared from industrial water and a medicament according to a proportion.
Preferably, in one embodiment, the above steps can be automatically performed by controlling the related water pump, control valve and power-on condition of the system by a program.
Further, for facilitating understanding of the cycle operation of the method for removing salt from cold rolling wastewater provided by the embodiment, please refer to fig. 2, fig. 3 and fig. 4, wherein fig. 4 is a schematic diagram of the interlocking control of the relevant water pump and valve during automatic operation. In the embodiment, one operation cycle of the electric adsorption device mainly comprises steps 1-5, which respectively correspond to the processes of flushing, water production, acid addition regeneration, reclaimed water regeneration and raw water regeneration of the electric adsorption device 300 of the cold rolling wastewater desalination system; the time control of the step sequence of each process can be controlled through an operation interface provided by a control unit, and the control of the water quality of the produced water of the system and the recovery rate of the system can be realized by combining the operation flow of the water inlet pump P10 and the operation flow of the intermediate water pump P20. Further, when the system is programmed, a plurality of step settings (step 6, step 7, step 8 … …) can be reserved, and flexible setting and adjustment of the system are realized.
As can be seen from fig. 4, in step 1, the water inlet pump P10 is activated, the first water inlet valve V11 and the first water outlet valve V21 are opened, so that the wastewater passes through the regulating reservoir 100, the filter 200, the electro-adsorption device 300, the concentrated water neutralizing reservoir 400 and the concentrated water reservoir 500, and part of the saline water is discharged; in the step 2, starting a water inlet pump P10, opening a first water inlet valve V11 and a second water outlet valve V22, so that the wastewater passes through the regulating tank 100, the filter 200, the electro-adsorption device 300, the produced water neutralizing tank 600 and the produced water tank 700, and the desalination and recycling of the wastewater are realized; in step 3, the intermediate water pump P20 and the hydrochloric acid pump P30 are started, and the second water inlet valve V12 and the first water outlet valve V21 are opened, so that the wastewater sequentially passes through the intermediate water tank 800, the filter 200, the electro-adsorption device 300, the concentrated water neutralization tank 400 and the concentrated water tank 500, and the acid adding regeneration of the electro-adsorption device 300 is realized; by analogy, a person skilled in the art can see from fig. 4 that a water pump and a control valve need to be opened when performing the reclaimed water regeneration and the raw water regeneration on the electro-adsorption device 300. Particularly, the duration of the time T1, T2, T3 … … of each step can be in units of seconds, and also can be in units of minutes.
In summary, the above embodiments have been described in detail for different configurations of a cold rolling wastewater desalination system, and it is understood that the above description is only for the description of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, the present invention includes but is not limited to the configurations listed in the above embodiments, and those skilled in the art can take the above embodiments to put it in a contrary way, and any changes and modifications made by those skilled in the art according to the above disclosure are all within the protection scope of the claims.
Claims (10)
1. A cold rolling wastewater desalination system is characterized by comprising an adjusting tank, a filter, an electric adsorption device, a concentrated water neutralization tank, a concentrated water tank, a produced water neutralization tank, a produced water tank and a control unit;
the water outlet of the regulating tank is communicated with the water inlet of the filter, and the water outlet of the filter is communicated with the first water inlet of the electric adsorption device;
a first water outlet of the electro-adsorption device is communicated with a water inlet of the concentrated water neutralization tank, and a water outlet of the concentrated water neutralization tank is communicated with a water inlet of the concentrated water tank;
a second water outlet of the electro-adsorption device is communicated with a water inlet of the produced water neutralization tank, and a water outlet of the produced water neutralization tank is communicated with a water inlet of the produced water tank;
when the electric adsorption device is electrified, the control unit is used for controlling the wastewater to pass through the regulating tank, the filter, the electric adsorption device, the concentrated water neutralizing tank and the concentrated water tank and then discharging partial salt-containing water;
or/and
when the electric adsorption device is electrified, the control unit is used for controlling the wastewater to pass through the regulating reservoir, the filter, the electric adsorption device, the produced water neutralizing pool and the produced water pool to obtain recycled water.
2. The cold rolling wastewater desalination system of claim 1, wherein the electro-adsorption device comprises a plurality of electro-adsorption modules, and a plurality of channels are formed between the polar plates of the plurality of electro-adsorption modules;
when the electric adsorption module is electrified, the surface of the polar plate becomes a double-electric layer, and when salt-containing wastewater passes through the channel, ions in the salt-containing wastewater can be adsorbed or trapped on the surface of the polar plate.
3. The cold rolling wastewater desalination system of claim 2, wherein when energized, OH hydroxyl radicals are formed on the surface of the plate, the OH hydroxyl radicals being capable of oxidizing organic matter in the wastewater.
4. The cold rolling wastewater desalination system of claim 1, further comprising a middle water tank, wherein a water inlet of the middle water tank is communicated with a third water outlet of the electro-adsorption device, and a water outlet of the middle water tank is communicated with a water inlet of the filter;
the water outlet of the middle water pool and the water outlet of the regulating pool are communicated with the water inlet of the filter through a tee joint;
when the electric adsorption device is powered off, the control unit is also used for controlling the acid adding regeneration, the reclaimed water regeneration and/or the raw water regeneration of the electric adsorption device;
wherein the content of the first and second substances,
the acid adding regeneration comprises that the control unit is used for enabling the wastewater to pass through the middle water tank, the filter, the electric adsorption device, the concentrated water neutralization tank and the concentrated water tank, and hydrochloric acid is added before the wastewater enters the electric adsorption device, so that the electric adsorption device is regenerated;
the reclaimed water regeneration comprises that the control unit is used for controlling the wastewater to pass through the reclaimed water tank, the filter, the electric adsorption device, the concentrated water neutralization tank and the concentrated water tank so that the electric adsorption device is regenerated;
the raw water regeneration comprises that the control unit is used for controlling the wastewater to pass through the regulating reservoir, the filter, the electric adsorption device and the reclaimed water tank, so that the electric adsorption device is regenerated.
5. The cold rolling wastewater desalination system of claim 4, further comprising a cleaning tank, wherein a first water outlet of the cleaning tank is communicated with a second water inlet of the electro-adsorption device, and a first water inlet of the cleaning tank is communicated with a fourth water outlet of the electro-adsorption device;
the control unit is also used for controlling the cleaning of the electric adsorption device, and the cleaning comprises the following operations which are executed in a circulating mode until the cleaning of the electric adsorption device is completed: discharging a cleaning solution from the cleaning tank to the electro-adsorption device, soaking and cleaning the electro-adsorption device, and discharging the cleaning solution from the electro-adsorption device to the cleaning tank;
and after the electric adsorption device finishes cleaning, the cleaning waste liquid is discharged to the cleaning box.
6. The cold rolling wastewater desalination system of claim 4, further comprising a plurality of automatic valves respectively disposed at the first water inlet, the second water inlet, the first water outlet, the second water outlet and the third water outlet of the electro-adsorption device;
the control unit is also used for controlling the yield and the water quality of the partial salt-containing water, the yield and the water quality of the reuse water, the regeneration of the electric adsorption device and/or the cleaning of the electric adsorption device by controlling the opening and closing time lengths of the automatic valves.
7. The cold rolling wastewater desalination system of claim 6, wherein the automatic valve comprises a pneumatic valve and/or an electric valve.
8. The cold rolling wastewater desalination system of claim 1, wherein the filter comprises a self-cleaning filter and/or a cartridge filter.
9. The cold rolling wastewater desalination system of any one of claims 1-8, wherein the filtration precision of the filtered water comprises 5-100 μm.
10. The cold rolling wastewater desalination system of any one of claims 1-8, wherein the electro-adsorption device comprises a roll-to-roll electro-adsorption module and/or a plate electro-adsorption module.
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| CN110395828A (en) * | 2019-08-28 | 2019-11-01 | 宝钢工程技术集团有限公司 | A kind of cold rolling wastewater desalting system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110395828A (en) * | 2019-08-28 | 2019-11-01 | 宝钢工程技术集团有限公司 | A kind of cold rolling wastewater desalting system and method |
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Effective date of registration: 20201118 Address after: Building 1, No. 1508 Mudanjiang Road, Baoshan District, Shanghai, 201900 Patentee after: Baowu Water Technology Co., Ltd Address before: 201999 Shanghai city Baoshan District Tieli Road No. 2510 Patentee before: BAOSTEEL ENGINEERING & TECHNOLOGY GROUP Co.,Ltd. |