CN217202173U - Continuous ion exchange system for treating heavy metal wastewater - Google Patents
Continuous ion exchange system for treating heavy metal wastewater Download PDFInfo
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Abstract
The utility model relates to a continuous ion exchange system for handling heavy metal waste water, including waste water storage tank, absorption main body unit, elution unit, regeneration unit and water production jar, absorption main body unit includes first adsorption column, second adsorption column and the third adsorption column that connects gradually in series, elution unit includes eluent storage tank and eluent recovery jar, regeneration unit includes regeneration liquid storage tank and regeneration liquid recovery jar; the waste water storage tank, the eluent storage tank and the regenerated liquid storage tank are all connected in parallel with inlets at the tops of the first adsorption column, the second adsorption column and the third adsorption column; the eluent recovery tank, the regenerated liquid storage tank and the water production tank are all connected in parallel with the bottom outlets of the first adsorption column, the second adsorption column and the third adsorption column; the bottom outlet of the third adsorption column is connected with the top inlet of the first adsorption column, so that the two adsorption columns are connected in series to treat heavy metal wastewater, and meanwhile, the other adsorption column is eluted and regenerated.
Description
Technical Field
The utility model belongs to the technical field of heavy metal wastewater treatment, concretely relates to continuous ion exchange system for handling heavy metal wastewater.
Background
The main treatment methods of heavy metals in industrial wastewater include electrolysis, chemical precipitation, oxidation-reduction, ion exchange and adsorption. Of which chemical precipitation and ion exchange are most commonly used. The chemical precipitation method can generate toxic pollutants, such as a large amount of heavy metal sludge, and secondary pollution is caused, and the treatment cost is high. The ion exchange method can remove heavy metal ions and recover the heavy metal ions, thereby avoiding the waste of heavy metal resources and recycling the waste water. The ion exchange technology is a novel, high-efficiency and energy-saving technology, the technology has low energy consumption, can not cause secondary pollution to the environment, and the water quality treated by the technology meets the standard and has wide application prospect.
The core of the ion exchange technology is ion exchange resin, which contains ion exchange groups in a cross-linked polymer structure and is a stable porous functional polymer material insoluble in acid, alkali and various organic solvents. The ion exchange between heavy metal and ion exchange resin is used to reduce the concentration of heavy metal in waste water and purify waste water. And the ion exchange resin can be regenerated by a regenerant after being saturated. The ion exchange resin method can selectively separate heavy metal ions in the wastewater, can better realize the treatment and recovery of the heavy metal ions in the wastewater, and reduces the waste of resources and the pollution to the environment.
However, the existing ion exchange technology has the following problems that the use amount of the adsorbing material is large but the utilization rate is low, the use amounts of the regenerant and the washing water are large, and the recovery rate of the heavy metal elements needs to be improved.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, the utility model provides a continuous ion exchange system for handling heavy metal waste water, including waste water storage tank, absorption main unit, elution unit, regeneration unit and product water jar, absorption main unit includes first adsorption column, second adsorption column and the third adsorption column that connects gradually in series, elution unit includes eluent storage tank and eluent recovery jar, regeneration unit includes regeneration liquid storage tank and regeneration liquid recovery jar;
the waste water storage tank, the eluent storage tank and the regenerated liquid storage tank are all connected in parallel with inlets at the tops of the first adsorption column, the second adsorption column and the third adsorption column; the eluent recovery tank, the regenerated liquid storage tank and the water production tank are all connected in parallel with the bottom outlets of the first adsorption column, the second adsorption column and the third adsorption column;
the bottom outlet of the third adsorption column is connected with the top inlet of the first adsorption column, so that the two adsorption columns are connected in series to treat heavy metal wastewater, and the other adsorption column is subjected to elution regeneration;
an inlet of the water production tank is connected with a water production main pipe, a first water production branch pipe, a second water production branch pipe and a third water production branch pipe are connected to the water production main pipe in parallel, the first water production branch pipe is connected with a bottom outlet of the first adsorption column, the second water production branch pipe is connected with a bottom outlet of the second adsorption column, and the third water production branch pipe is connected with a bottom outlet of the third adsorption column;
an inlet of the eluent recovery tank is connected with an elution water main pipe, the elution water main pipe is connected with a first elution water branch pipe, a second elution water branch pipe and a third elution water branch pipe in parallel, and the tail end of the first elution water branch pipe is connected with the first water production branch pipe through a three-way pipe; the tail end of the second elution water outlet branch pipe is connected to the second water production branch pipe through the first three-way valve, so that the produced water discharge of the first adsorption column is not influenced by the effluent water generated during elution and regeneration of the second adsorption column; the tail end of the third elution water outlet branch pipe is connected with the third water production branch pipe through a second three-way valve, so that the water output of the second adsorption column is not influenced when the third adsorption column is eluted and regenerated.
The waste water storage tank is connected with the top inlets of the first adsorption column, the second adsorption column and the third adsorption column in parallel, the eluent storage tank is connected with the top inlets of the first adsorption column, the second adsorption column and the third adsorption column in parallel, and the regenerated liquid storage tank is connected with the top inlets of the first adsorption column, the second adsorption column and the third adsorption column in parallel;
the eluent recovery tank is connected with the bottom outlets of the first adsorption column, the second adsorption column and the third adsorption column in parallel, the regenerated liquid storage tank is connected with the bottom outlets of the first adsorption column, the second adsorption column and the third adsorption column in parallel, and the water production tank is connected with the bottom outlets of the first adsorption column, the second adsorption column and the third adsorption column in parallel.
Optionally, an outlet of the wastewater storage tank is connected with a wastewater main pipe, and a first pump and a first valve are arranged on the wastewater main pipe and close to the wastewater storage tank;
a first wastewater branch pipe, a second wastewater branch pipe and a third wastewater branch pipe are connected in parallel on the wastewater main pipe, a second valve is arranged on the first wastewater branch pipe, a third valve is arranged on the second wastewater branch pipe, and a fourth valve is arranged on the third wastewater branch pipe;
the first waste water branch pipe is connected with the top inlet of the first adsorption column, the second waste water branch pipe is connected with the top inlet of the second adsorption column, and the third waste water branch pipe is connected with the top inlet of the third adsorption column, so that heavy metal waste water in the waste water storage tank can be respectively input into the three adsorption columns.
Optionally, an outlet of the eluent storage tank is connected with an eluent main pipe, and a second pump and a twelfth valve are arranged on the eluent main pipe and close to the eluent storage tank; the main eluent pipe is respectively communicated with the first waste water branch pipe, the second waste water branch pipe and the third waste water branch pipe through three four-way pipe fittings;
and a fifth valve is arranged on the main eluent pipe between the first waste water branch pipe and the second waste water branch pipe, and a sixth valve is arranged on the main eluent pipe between the second waste water branch pipe and the third waste water branch pipe and used for controlling eluent to enter different adsorption columns.
Optionally, an outlet of the regenerated liquid storage tank is connected with a regenerated liquid main pipe, and a third pump and a sixteenth valve are arranged on the regenerated liquid main pipe and close to the regenerated liquid storage tank; the regeneration liquid main pipe is respectively communicated with the first waste water branch pipe, the second waste water branch pipe and the third waste water branch pipe through three four-way pipe fittings;
and a seventh valve is arranged on the regenerated liquid main pipe between the first waste water branch pipe and the second waste water branch pipe, and an eighth valve is arranged on the regenerated liquid main pipe between the second waste water branch pipe and the third waste water branch pipe and used for controlling regenerated liquid to enter different adsorption columns.
Further optionally, a ninth valve is arranged between the main regenerated liquid pipe and the top inlet of the first adsorption column, a tenth valve is arranged between the main regenerated liquid pipe and the top inlet of the second adsorption column, and an eleventh valve is arranged between the main regenerated liquid pipe and the top inlet of the third adsorption column, so that each adsorption column can be controlled to input different liquids.
Optionally, a twelfth valve is arranged on the water production main pipe and close to the water production tank;
the first water production branch pipe is connected with the bottom outlet of the first adsorption column through a seventeenth valve, the second water production branch pipe is connected with the bottom outlet of the second adsorption column through an eighteenth valve, and the third water production branch pipe is connected with the bottom outlet of the third adsorption column through a nineteenth valve;
and a thirtieth valve is arranged on the water production main pipe between the first water production branch pipe and the second water production branch pipe, so that the output water of the first adsorption column in the elution and regeneration processes is prevented from being input into the water production tank.
Optionally, a first pH meter and a twenty-eighth valve are sequentially arranged on the main elution water pipe and near the eluent recovery tank;
a twentieth valve is arranged on the first eluting water branch pipe, a twenty-first valve is arranged on the second eluting water branch pipe, and a twenty-twelfth valve is arranged on the third eluting water branch pipe.
Further optionally, a twenty-third valve is arranged on the main elution water outlet pipe between the first elution water outlet branch pipe and the second elution water outlet branch pipe, and a twenty-fourth valve is arranged on the main elution water outlet pipe between the second elution water outlet branch pipe and the third elution water outlet branch pipe, and is used for controlling the discharge of different adsorption column eluents respectively.
Optionally, an inlet of the regeneration liquid recovery tank is connected with a regeneration water outlet main pipe, and a second pH meter and a thirty-one valve are sequentially arranged on the regeneration water outlet main pipe and close to the regeneration liquid recovery tank;
the regenerated water main pipe is connected with the first regenerated water branch pipe, the second regenerated water branch pipe and the third regenerated water branch pipe in parallel, the first regenerated water branch pipe is connected with the first elution water branch pipe through a twenty-fifth valve, the second regenerated water branch pipe is connected with the second elution water branch pipe through a twenty-sixth valve, and the third elution water branch pipe is connected with the third elution water branch pipe through a twenty-seventh valve.
Further optionally, a twenty-ninth valve is arranged on the main regenerated water outlet pipe between the first regenerated water outlet branch pipe and the second regenerated water outlet branch pipe, and a thirty valve is arranged on the main regenerated water outlet pipe between the second regenerated water outlet branch pipe and the third regenerated water outlet branch pipe and used for respectively controlling the discharge of regenerated liquids of different adsorption columns.
A continuous ion exchange system for handling heavy metal waste water, through 2 ion exchange columns of establishing ties, simultaneously, carry out 1 take off of other and wash and regeneration process, can greatly improve the utilization ratio of adsorbing material in this system, can shorten the regeneration time of ion exchange adsorbing material again greatly, improved ion exchange efficiency.
Drawings
FIG. 1 is a schematic structural diagram of the continuous ion exchange system for treating heavy metal wastewater.
In the figure, 1-a wastewater storage tank, 2-an eluent storage tank, 3-a regenerated liquid storage tank, 4-an eluent recovery tank, 5-a regenerated liquid recovery tank, 6-a water production tank, 7-a wastewater main pipe, 8-an eluent main pipe, 9-a regenerated liquid main pipe, 10-a first series pipe, 11-a second series pipe, 12-a third series pipe, 13-a water production main pipe, 14-an elution water main pipe, 15-a regenerated water main pipe, I-a first adsorption column, II-a second adsorption column, III-a third adsorption column, B1-a first pump, B2-a second pump, B3-a third pump, J1-a first pH meter, J2-a second pH meter, K1-a first valve, K2-a second valve, K3-a third valve, K4-a fourth valve, k5-fifth valve, K6-sixth valve, K7-seventh valve, K8-eighth valve, K9-ninth valve, K10-tenth valve, K11-eleventh valve, K12-twelfth valve, K13-thirteenth valve, K14-fourteenth valve, K15-fifteenth valve, K16-sixteenth valve, K17-seventeenth valve, K18-eighteenth valve, K19-nineteenth valve, K20-twentieth valve, K21-twenty-first valve, K22-twenty-second valve, K23-twenty-third valve, K24-twenty-fourth valve, K25-twenty-fifth valve, K26-twenty-sixth valve, K27-twenty-seventh valve, K28-twenty-eighth valve, K29-twenty-ninth valve, K30-thirty-third valve, k31-thirty-one valve, K32-thirty-two valve, K33-thirty-three valve.
Detailed Description
The embodiment provides a continuous ion exchange system for treating heavy metal wastewater, as shown in fig. 1, the continuous ion exchange system comprises a wastewater storage tank 1, an adsorption main unit, an elution unit, a regeneration unit and a water production tank 6, wherein the adsorption main unit comprises a first adsorption column I, a second adsorption column II and a third adsorption column III which are sequentially connected in series, the elution unit comprises an eluent storage tank 2 and an eluent recovery tank 4, and the regeneration unit comprises a regenerated liquid storage tank 3 and a regenerated liquid recovery tank 5;
the waste water storage tank 1, the eluent storage tank 2 and the regenerated liquid storage tank 3 are all connected in parallel with inlets at the tops of the first adsorption column I, the second adsorption column II and the third adsorption column III; the eluent recovery tank 4, the regenerated liquid storage tank 5 and the water production tank 6 are all connected in parallel with the bottom outlets of the first adsorption column I, the second adsorption column II and the third adsorption column III;
the waste water storage tank 1 is connected with the top inlets of the first adsorption column I, the second adsorption column II and the third adsorption column III in parallel, the eluent storage tank 2 is connected with the top inlets of the first adsorption column I, the second adsorption column II and the third adsorption column III in parallel, and the regenerated liquid storage tank 3 is connected with the top inlets of the first adsorption column I, the second adsorption column II and the third adsorption column III in parallel;
the eluent recovery tank 4 is connected with the bottom outlets of the first adsorption column I, the second adsorption column II and the third adsorption column III in parallel, the regenerated liquid storage tank 3 is connected with the bottom outlets of the first adsorption column I, the second adsorption column II and the third adsorption column III in parallel, and the water production tank 6 is connected with the bottom outlets of the first adsorption column I, the second adsorption column II and the third adsorption column III in parallel;
the bottom outlet of the third adsorption column III is connected with the top inlet of the first adsorption column I, so that the two adsorption columns are connected in series to treat heavy metal wastewater, and the other adsorption column is subjected to elution regeneration;
an inlet of the water production tank 6 is connected with a water production main pipe 13, a first water production branch pipe, a second water production branch pipe and a third water production branch pipe are connected to the water production main pipe 13 in parallel, the first water production branch pipe is connected with a bottom outlet of the first adsorption column I, the second water production branch pipe is connected with a bottom outlet of the second adsorption column II, and the third water production branch pipe is connected with a bottom outlet of the third adsorption column III;
an inlet of the eluent recovery tank 4 is connected with an elution outlet main pipe 8, the elution outlet main pipe 8 is connected with a first elution outlet branch pipe, a second elution outlet branch pipe and a third elution outlet branch pipe in parallel, and the tail end of the first elution outlet branch pipe is connected with the first water production branch pipe through a three-way pipe; the tail end of the second elution water outlet branch pipe is connected to the second water production branch pipe through the first three-way valve, so that the effluent generated during elution and regeneration of the second adsorption column II does not influence the discharge of the produced water of the first adsorption column I; the tail end of the third elution water outlet branch pipe is connected with the third water production branch pipe through a second three-way valve, so that the effluent generated during elution and regeneration of the third adsorption column III does not influence the water production and discharge of the second adsorption column II.
The first adsorption column I, the second adsorption column II and the third adsorption column III are filled with ion exchange adsorbent, such as ion exchange resin, activated carbon, synthetic adsorbent, etc.
Optionally, an outlet of the wastewater storage tank 1 is connected to a wastewater main pipe 7, and a first pump B1 and a first valve K1 are arranged on the wastewater main pipe 7 and near the wastewater storage tank 1;
the main wastewater pipe 7 is connected with a first wastewater branch pipe, a second wastewater branch pipe and a third wastewater branch pipe in parallel, the first wastewater branch pipe is provided with a second valve K2, the second wastewater branch pipe is provided with a third valve K3, and the third wastewater branch pipe is provided with a fourth valve K4;
the first waste water branch pipe is connected with the top inlet of the first adsorption column I, the second waste water branch pipe is connected with the top inlet of the second adsorption column II, and the third waste water branch pipe is connected with the top inlet of the third adsorption column III and used for inputting heavy metal waste water in the waste water storage tank 1 into the three adsorption columns respectively.
Optionally, an outlet of the eluent storage tank 2 is connected to an eluent main pipe 8, and a second pump B2 and a twelfth valve K12 are arranged on the eluent main pipe 8 and close to the eluent storage tank 2; the eluent main pipe 8 is respectively communicated with the first waste water branch pipe, the second waste water branch pipe and the third waste water branch pipe through three four-way pipe fittings;
a fifth valve K5 is arranged on the main eluent pipe 8 between the first waste water branch pipe and the second waste water branch pipe, and a sixth valve K6 is arranged on the main eluent pipe 8 between the second waste water branch pipe and the third waste water branch pipe and is used for controlling eluent to enter different adsorption columns.
Optionally, an outlet of the regeneration liquid storage tank 3 is connected to a regeneration liquid main pipe 9, and a third pump B3 and a sixteenth valve K16 are arranged on a pipe of the regeneration liquid main pipe 9 and near the regeneration liquid storage tank 3; the regeneration liquid main pipe 9 is respectively communicated with the first waste water branch pipe, the second waste water branch pipe and the third waste water branch pipe through three four-way pipe fittings;
a seventh valve K7 is arranged on the main regenerated liquid pipe 9 between the first waste water branch pipe and the second waste water branch pipe, and an eighth valve K8 is arranged on the main regenerated liquid pipe 9 between the second waste water branch pipe and the third waste water branch pipe and used for controlling regenerated liquid to enter different adsorption columns.
Optionally, the first pump B1, the second pump B2 and the third pump B3 are all centrifugal pumps.
Further optionally, a ninth valve K9 is disposed between the main regenerated liquid pipe 9 and the top inlet of the first adsorption column I, a tenth valve K10 is disposed between the main regenerated liquid pipe 9 and the top inlet of the second adsorption column II, and an eleventh valve K11 is disposed between the main regenerated liquid pipe 9 and the top inlet of the third adsorption column III, so as to control each adsorption column to input different liquids.
Optionally, the bottom outlet of the first adsorption column I is connected to the top inlet of the second adsorption column II through a first serial pipe 10, and a fourteenth valve K14 is arranged on the first serial pipe 10; the bottom outlet of the second adsorption column II is connected with the top inlet of the third adsorption column III through a second serial pipe 11, and a fifteenth valve K15 is arranged on the second serial pipe 11; the bottom outlet of the third adsorption column III is connected with the top inlet of the first adsorption column I through a third serial pipe 12, and a thirteenth valve K13 is arranged on the third serial pipe 12 and used for connecting two adjacent adsorption columns in series.
Further optionally, the tail end of the first series pipe 10 is connected to a second wastewater branch pipe between the top inlet of the second adsorption column II and the tenth valve K10 through a tee pipe; the tail end of the second serial pipe 11 is connected with a third waste water branch pipe between the top inlet of the third adsorption column III and an eleventh valve K11 through a tee pipe; the tail end of the third serial pipe 12 is connected with a first waste water branch pipe between the top inlet of the first adsorption column I and the ninth valve K9 through a three-way pipe, so that serial water leakage between the adsorption columns and water inflow of the raw material heavy metal waste water are not interfered with each other.
Optionally, a twelfth valve K32 is arranged on the water production main pipe 13 and near the water production tank 6;
the first water producing branch pipe is connected with the bottom outlet of the first adsorption column I through a seventeenth valve K17, the second water producing branch pipe is connected with the bottom outlet of the second adsorption column II through an eighteenth valve K18, and the third water producing branch pipe is connected with the bottom outlet of the third adsorption column III through a nineteenth valve K19;
a thirtieth valve K33 is arranged on the main water producing pipe 13 between the first water producing branch pipe and the second water producing branch pipe, so as to prevent the effluent of the first adsorption column I in the elution and regeneration processes from being input into the water producing tank 6.
Further optionally, the head end of the first series pipe 10 is connected with a first water producing branch pipe between the bottom outlet of the first adsorption column I and a seventeenth valve K17 through a tee pipe; the head end of the second serial pipe 11 is connected with a second water producing branch pipe between the bottom outlet of the second adsorption column II and the eighteenth valve K18 through a tee pipe; the head end of the third serial pipe 12 is connected with a third water production branch pipe between the bottom outlet of the third adsorption column III and the nineteenth valve K19 through a three-way pipe, so that serial water passing and discharged water production among the adsorption columns are not interfered with each other.
Optionally, a first pH meter J1 and a twenty-eighth valve K28 are sequentially arranged on the main elution water pipe 14 and near the eluent recovery tank 4; the first pH meter J1 is used for judging the time of elution stop;
the first elution water branch pipe is provided with a twentieth valve K20, the second elution water branch pipe is provided with a twenty-first valve K21, and the third elution water branch pipe is provided with a twentieth valve K22.
Further optionally, a twenty-third valve K23 is arranged on the main elution water pipe 14 between the first branch elution water pipe and the second branch elution water pipe, and a twenty-fourth valve K24 is arranged on the main elution water pipe 14 between the second branch elution water pipe and the third branch elution water pipe, and is used for controlling the discharge of eluents of different adsorption columns respectively.
Optionally, an inlet of the reclaimed liquid recovery tank 5 is connected to a reclaimed water main pipe 15, and a second pH meter J2 and a thirty-one valve K31 are sequentially arranged on the reclaimed water main pipe 15 and near the reclaimed liquid recovery tank 5; the second pH meter J2 is used for judging the time for stopping regeneration;
the main regenerated water outlet pipe 15 is connected in parallel with a first regenerated water outlet branch pipe, a second regenerated water outlet branch pipe and a third regenerated water outlet branch pipe, the first regenerated water outlet branch pipe is connected with the first elution water outlet branch pipe through a twenty-fifth valve K25, the second regenerated water outlet branch pipe is connected with the second elution water outlet branch pipe through a twenty-sixth valve K26, and the third elution water outlet branch pipe is connected with the third elution water outlet branch pipe through a twenty-seventh valve K27.
Further optionally, a twenty-ninth valve K29 is arranged on the main regenerated water outlet pipe 15 between the first regenerated water outlet branch pipe and the second regenerated water outlet branch pipe, and a thirty-third valve K30 is arranged on the main regenerated water outlet pipe 15 between the second regenerated water outlet branch pipe and the third regenerated water outlet branch pipe, and is used for respectively controlling the discharge of regenerated liquids of different adsorption columns.
The eluent storage tank 2 stores eluent, such as hydrochloric acid solution, and the regeneration liquid storage tank 3 stores regeneration liquid, such as dilute alkali (NaOH) solution. The eluent recovery tank, the regenerated liquid recovery tank and the water production tank can be provided with valves at the outlets to control the liquid to be discharged.
A first adsorption column I and a second adsorption column II are connected in series for adsorption, and a third adsorption column III is reserved; and after the first adsorption column I is adsorbed and saturated, the first adsorption column I is subjected to desorption, a third adsorption column III is started to be connected with a second adsorption column II in series for adsorption, desorption can be stopped when the pH of the desorption acid water of the first adsorption column I is reduced to about 1, a dilute alkali solution is used for regeneration, and the first adsorption column I is cleaned by the dilute alkali solution until the pH is neutral, so that the regeneration of the first adsorption column I is completed.
And after the first adsorption column I is successfully regenerated, after the second adsorption column II is saturated in adsorption, the second adsorption column II is subjected to desorption, the third adsorption column III is started to be connected with the first adsorption column I in series for adsorption, and the desorption can be stopped until the pH of the desorption acid water of the second adsorption column II is reduced to about 1, and the regeneration liquid is washed until the pH is neutral, so that the regeneration of the second adsorption column II is completed.
And after the second adsorption column II is successfully regenerated, after the third adsorption column III is saturated in adsorption, the third adsorption column III is subjected to desorption, the second adsorption column II is started to be connected with the first adsorption column I in series for adsorption, and the adsorption is performed in such a circulating way.
The specific operation is as follows:
s1, adsorption: b1, K1, K2, K9, K14, K18 and K32 are opened, other valves are closed, the first three-way valve is communicated with the second water production branch pipe and the water production main pipe, the lithium-containing wastewater is subjected to adsorption treatment by serially connecting the first adsorption column I and the second adsorption column II, the produced water is input into the water production tank, and the third adsorption column III is reserved;
s2, after the first adsorption column I is adsorbed to saturation, starting a second adsorption column II and a third adsorption column III to adsorb and treat wastewater in series, closing K2, K9, K14 and K18, starting K3, K10, K15 and K19, connecting a second three-way valve with a third water production branch pipe and a water production main pipe, and carrying out desorption and regeneration on the first adsorption column I;
s3, eluting the first adsorption column I: b2, K12, K9, K17, K20 and K28 are opened, K2, K13, K14 and K33 are closed, and J1 is observed;
s4, regenerating the first adsorption column I: b3, K16 and K9 are turned on, JI is observed, K28 is turned off when the pH value is not less than 3, K25, K29 and K31 are turned on, J2 is observed, regeneration is completed when the pH value is not less than 6, and B3, K16, K25, K29, K31 and K20 are turned off;
s5, after the second adsorption column II is saturated in adsorption, simultaneously the first adsorption column I is subjected to desorption and regeneration, the third adsorption column III and the first adsorption column I are started to be connected in series to adsorb and treat wastewater, K3, K9, K15, K19 and K20 are closed, K4, K11, K13, K17 and K33 are opened, and the second adsorption column II is subjected to desorption and regeneration;
s6, eluting the second adsorption column II: opening K5, K10, K18, K21, K23 and K28, connecting a first three-way valve with a second water production branch pipe and a second elution branch pipe, and observing J1;
s7, regenerating the second adsorption column II: k5 and K7 are turned off, JI is observed, K23, K29 and K30 are turned off, K26 and K31 are turned on, J2 is observed when the pH value is not less than 6, and regeneration is completed;
s8, after the adsorption of the third adsorption column III is saturated, and simultaneously after the desorption and regeneration of the second adsorption column II are finished, starting the first adsorption column I and the second adsorption column II to serially adsorb and treat the wastewater (the operation is the same as S1), and circularly adsorbing in the way;
s9, eluting the third adsorption column III: closing K4, K10, K15 and K21, opening K5, K6, K11, K19, K22, K24, K23 and K28, connecting a second three-way valve with a third water production branch pipe and a third elution branch pipe, and observing J1;
s10, regenerating the third adsorption column III: k7 and K8 are turned on, JI is observed, K24, K6, K29 and K26 are turned off when the pH value is not less than 3, K27 and K30 are turned on, J2 is observed, and regeneration is completed when the pH value is not less than 6.
Claims (10)
1. A continuous ion exchange system for treating heavy metal wastewater is characterized by comprising a wastewater storage tank, an adsorption main body unit, an elution unit, a regeneration unit and a water production tank, wherein the adsorption main body unit comprises a first adsorption column, a second adsorption column and a third adsorption column which are sequentially connected in series, the elution unit comprises an eluent storage tank and an eluent recovery tank, and the regeneration unit comprises a regenerated liquid storage tank and a regenerated liquid recovery tank;
the waste water storage tank, the eluent storage tank and the regenerated liquid storage tank are all connected in parallel with inlets at the tops of the first adsorption column, the second adsorption column and the third adsorption column; the eluent recovery tank, the regenerated liquid storage tank and the water production tank are all connected in parallel with the bottom outlets of the first adsorption column, the second adsorption column and the third adsorption column;
the bottom outlet of the third adsorption column is connected with the top inlet of the first adsorption column, so that the two adsorption columns are connected in series to treat the heavy metal wastewater, and the other adsorption column is eluted and regenerated;
an inlet of the water production tank is connected with a water production main pipe, a first water production branch pipe, a second water production branch pipe and a third water production branch pipe are connected to the water production main pipe in parallel, the first water production branch pipe is connected with a bottom outlet of the first adsorption column, the second water production branch pipe is connected with a bottom outlet of the second adsorption column, and the third water production branch pipe is connected with a bottom outlet of the third adsorption column;
an inlet of the eluent recovery tank is connected with an elution main water pipe, the elution main water pipe is connected with a first elution water branch pipe, a second elution water branch pipe and a third elution water branch pipe in parallel, and the tail end of the first elution water branch pipe is connected with the first water production branch pipe through a three-way pipe; the tail end of the second elution water outlet branch pipe is connected to the second water production branch pipe through the first three-way valve, so that the produced water discharge of the first adsorption column is not influenced by the effluent water generated during elution and regeneration of the second adsorption column; the tail end of the third elution water outlet branch pipe is connected with the third water production branch pipe through a second three-way valve, so that the water output of the second adsorption column is not influenced when the third adsorption column is eluted and regenerated.
2. The continuous ion exchange system of claim 1, wherein the outlet of the wastewater storage tank is connected to a wastewater main pipe, and a first pump and a first valve are arranged on the wastewater main pipe and close to the wastewater storage tank;
a first wastewater branch pipe, a second wastewater branch pipe and a third wastewater branch pipe are connected in parallel on the wastewater main pipe, a second valve is arranged on the first wastewater branch pipe, a third valve is arranged on the second wastewater branch pipe, and a fourth valve is arranged on the third wastewater branch pipe;
the first waste water branch pipe is connected with the top inlet of the first adsorption column, the second waste water branch pipe is connected with the top inlet of the second adsorption column, and the third waste water branch pipe is connected with the top inlet of the third adsorption column and used for inputting heavy metal waste water in the waste water storage tank into the three adsorption columns respectively.
3. The continuous ion exchange system of claim 2, wherein the outlet of the eluent storage tank is connected to a main eluent pipe, and a second pump and a twelfth valve are arranged on the main eluent pipe and close to the eluent storage tank; the main eluent pipe is respectively communicated with the first waste water branch pipe, the second waste water branch pipe and the third waste water branch pipe through three four-way pipe fittings;
and a fifth valve is arranged on the main eluent pipe between the first waste water branch pipe and the second waste water branch pipe, and a sixth valve is arranged on the main eluent pipe between the second waste water branch pipe and the third waste water branch pipe and used for controlling eluent to enter different adsorption columns.
4. The continuous ion exchange system according to claim 3, wherein the outlet of the regeneration liquid storage tank is connected with a regeneration liquid main pipe, and a third pump and a sixteenth valve are arranged on the regeneration liquid main pipe and close to the regeneration liquid storage tank; the regeneration liquid main pipe is respectively communicated with the first waste water branch pipe, the second waste water branch pipe and the third waste water branch pipe through three four-way pipe fittings;
and a seventh valve is arranged on the regenerated liquid main pipe between the first waste water branch pipe and the second waste water branch pipe, and an eighth valve is arranged on the regenerated liquid main pipe between the second waste water branch pipe and the third waste water branch pipe and used for controlling regenerated liquid to enter different adsorption columns.
5. The continuous ion exchange system of claim 4, wherein a ninth valve is arranged between the main regeneration liquid pipe and the top inlet of the first adsorption column, a tenth valve is arranged between the main regeneration liquid pipe and the top inlet of the second adsorption column, and an eleventh valve is arranged between the main regeneration liquid pipe and the top inlet of the third adsorption column, so as to control each adsorption column to input different liquids.
6. The continuous ion exchange system of claim 5, wherein a thirty-two valve is provided on the main water production pipe and near the water production tank;
the first water production branch pipe is connected with the bottom outlet of the first adsorption column through a seventeenth valve, the second water production branch pipe is connected with the bottom outlet of the second adsorption column through an eighteenth valve, and the third water production branch pipe is connected with the bottom outlet of the third adsorption column through a nineteenth valve;
and a thirtieth valve is arranged on the water production main pipe between the first water production branch pipe and the second water production branch pipe, so that the output water of the first adsorption column in the elution and regeneration processes is prevented from being input into the water production tank.
7. The continuous ion exchange system of claim 6, wherein a first pH meter and a twenty-eighth valve are sequentially arranged on the main elution water pipe and close to the eluent recovery tank;
and a twentieth valve is arranged on the first eluting water branch pipe, a twenty-first valve is arranged on the second eluting water branch pipe, and a twenty-twelfth valve is arranged on the third eluting water branch pipe.
8. The continuous ion exchange system according to claim 7, wherein a twenty-third valve is disposed on the main elution water pipe between the first and second branch elution water pipes, and a twenty-fourth valve is disposed on the main elution water pipe between the second and third branch elution water pipes, for controlling the discharge of eluents of different adsorption columns respectively.
9. The continuous ion exchange system of claim 8, wherein an inlet of the regenerant liquid recovery tank is connected with a main regenerant water outlet pipe, and a second pH meter and a thirty-one valve are sequentially arranged on the main regenerant water outlet pipe and close to the regenerant liquid recovery tank;
the regenerated water main pipe is connected with the first regenerated water branch pipe, the second regenerated water branch pipe and the third regenerated water branch pipe in parallel, the first regenerated water branch pipe is connected with the first elution water branch pipe through a twenty-fifth valve, the second regenerated water branch pipe is connected with the second elution water branch pipe through a twenty-sixth valve, and the third elution water branch pipe is connected with the third elution water branch pipe through a twenty-seventh valve.
10. The continuous ion exchange system according to claim 9, wherein a twenty-ninth valve is disposed on the main regenerated water outlet pipe between the first and second branch regenerated water outlets, and a thirty-third valve is disposed on the main regenerated water outlet pipe between the second and third branch regenerated water outlets for controlling the discharge of regenerated liquids from different adsorption columns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221529964.1U CN217202173U (en) | 2022-06-20 | 2022-06-20 | Continuous ion exchange system for treating heavy metal wastewater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221529964.1U CN217202173U (en) | 2022-06-20 | 2022-06-20 | Continuous ion exchange system for treating heavy metal wastewater |
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| CN217202173U true CN217202173U (en) | 2022-08-16 |
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| CN202221529964.1U Active CN217202173U (en) | 2022-06-20 | 2022-06-20 | Continuous ion exchange system for treating heavy metal wastewater |
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2022
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