CN212532512U

CN212532512U - Regeneration waste water recovery processing system after salt solution is refined

Info

Publication number: CN212532512U
Application number: CN202020342303.2U
Authority: CN
Inventors: 林天富; 王连华; 吴海平; 张伟杰; 危振添
Original assignee: Fujian Southeast Electrochemical Co ltd
Current assignee: Fujian Southeast Electrochemical Co ltd
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2021-02-12
Anticipated expiration: 2030-03-18

Abstract

The utility model relates to a system for recycling and treating regenerated wastewater after brine refining, which comprises two wastewater discharge pipes respectively used for discharging denitration concentrated solution and regenerated wastewater of a chelate resin tower; the waste water discharge pipe is communicated with the impurity discharge recovery tank; the impurity discharging and recycling tank is communicated with the water diversion tank through a water conveying pipeline; the water diversion tank is communicated with the circulating output system through a water conveying pipeline; the circulating output system comprises two wastewater treatment pumps which are connected in parallel, the inlets of the two wastewater treatment pumps are communicated with the water pipeline through branch pipes, and the outlets of the two wastewater treatment pumps are communicated with each other through a collecting pipe; the collecting pipe is respectively connected with an outer discharge pipe and a return pipe, the outer discharge pipe directly discharges the treated wastewater, and the return pipe is communicated with the impurity discharge recovery tank through a return branch.

Description

Regeneration waste water recovery processing system after salt solution is refined

Technical Field

The utility model belongs to the technical field of chemical industry equipment, concretely relates to regeneration waste water recovery processing system after salt solution is refined.

Background

At present, the domestic caustic soda is mainly produced by an ion membrane method, in the process of producing the caustic soda by the ion membrane method, secondary brine refining matched equipment is a chelating resin tower, chelating resin is filled in the resin tower, and when the chelating resin contains Ca, the chelating resin also contains Ca²⁺、Mg²⁺Ca in the brine when the brine is contacted²⁺、Mg²⁺Unstable sodium ion among the ion substitution chelate resin to play the purpose of refined salt water, chelate resin will lose the exchange capacity after adsorbing calcium, magnesium ion, in order to resume its ability, need to go through steps such as backwash, break away from impurity, washing, this regeneration process can produce a large amount of waste water, and these waste water are acidity, contain a large amount of heavy metal ions such as calcium magnesium in addition, can cause serious pollution to the environment if direct discharge, also seriously endangered people's health simultaneously. The conventional wastewater treatment devices have limited treatment capacity and cannot accommodate treatment of about 200m after each regeneration³The waste water of (2).

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a regeneration waste water recovery processing system after salt solution is refined can retrieve a large amount of miscellaneous waste water of discharging including chelate resin regeneration waste water and salt solution refining process after concentrate, reduces follow-up sewage treatment pressure, increases regeneration elasticity.

The technical scheme of the utility model as follows:

a system for recycling and treating regenerated wastewater after brine refining comprises two wastewater discharge pipes which are respectively used for discharging denitration concentrated solution and chelating resin tower regenerated wastewater; the waste water discharge pipe is communicated with the impurity discharge recovery tank; the impurity discharging and recycling tank is communicated with the water diversion tank through a water conveying pipeline; the water diversion tank is communicated with the circulating output system through a water conveying pipeline; the circulating output system comprises two wastewater treatment pumps which are connected in parallel, the inlets of the two wastewater treatment pumps are communicated with the water pipeline through branch pipes, and the outlets of the two wastewater treatment pumps are communicated with each other through a collecting pipe; the collecting pipe is respectively connected with an outer discharge pipe and a return pipe, the outer discharge pipe directly discharges the treated wastewater, and the return pipe is communicated with the impurity discharge recovery tank through a return branch.

Furthermore, the miscellaneous discharge recovery tank is a semi-underground tank, and glass fiber reinforced plastics are lined in the miscellaneous discharge recovery tank; still be provided with a plurality of agitators and level gauge in the miscellaneous row recovery pond.

Furthermore, a primary alkali liquor conveying pipe is externally connected with the miscellaneous discharge recovery tank, and alkali liquor is input into the miscellaneous discharge recovery tank through the primary alkali liquor conveying pipe to adjust the pH value of the wastewater; and a secondary alkali liquor conveying pipe is connected outside the water diversion tank, and alkali liquor is input into the water diversion tank through the secondary alkali liquor conveying pipe to adjust the pH value of the wastewater.

Further, a filter with a filter screen is connected in series on the wastewater discharge pipe for discharging the regeneration wastewater of the chelate resin tower, and a clarifier is connected in series on the wastewater discharge pipe for discharging the denitration concentrated solution; the waste water discharge pipe for discharging the regeneration waste water of the chelating resin tower is a CPVC pipe, and the waste water discharge pipe for discharging the denitration concentrated solution is a steel lining PO pipe.

Further, a vent pipe is arranged at the top of the water diversion tank.

Furthermore, pH monitoring meters are arranged on the return pipe and the water diversion tank.

The utility model discloses following beneficial effect has:

1. the system provided by the utility model can meet the treatment requirements of a large amount of regenerated wastewater after brine refining, the utility model is provided with the miscellaneous discharge recovery tank which is used for collecting wastewater and denitration concentrated solution from a chelate resin tower in the brine refining process, the miscellaneous discharge recovery tank not only has the function of storing a large amount of wastewater, but also is added with alkali liquor in the miscellaneous discharge recovery tank for primary acid-base neutralization and pH adjustment to 4-5, at the moment, the wastewater amount in the miscellaneous discharge recovery tank is large, only the wastewater needs to be integrally pretreated, the wastewater has the buffer effect, the requirements of subsequent neutralization treatment of a large amount of acidic wastewater are ensured, the wastewater is introduced into the water introduction tank and then added with alkali liquor again for pH adjustment to 7-9, at the moment, the water introduction tank is utilized for carrying out more precise neutralization adjustment on the input wastewater, the process of neutralizing acidic wastewater is ensured to be full, the whole system carries out neutralization treatment aiming at the wastewater with different concentrations and pH values by stages, can reduce the whole alkali liquor consumption and achieve better treatment effect.

2. The utility model discloses in still be provided with the waste water treatment pump and realize the backward flow circulation, utilize the waste water after the neutralization treatment to come as neutralization solution and diluent and flow back to miscellaneous row recovery pond once more for the treatment comes from the regeneration waste water and the denitration concentrate of chelate resin tower, can reduce the use of alkali lye, practices thrift the cost, can also realize the cyclic utilization to waste water.

Drawings

FIG. 1 is a process flow diagram of the present invention;

in the drawings, the reference numbers denote:

1. a waste water discharge pipe; 2. a miscellaneous row recycling tank; 3. a water delivery pipeline; 4. a water diversion tank; 5. a cycle output system; 6. a wastewater treatment pump; 7. a branch pipe; 8. a manifold; 9. an outer discharge pipe; 10. a return pipe; 11. a stirrer; 12. a liquid level meter; 13. a first-stage alkali liquor conveying pipe; 14. a secondary alkali liquor conveying pipe; 15. a filter; 16. a clarifier; 17. a breather pipe; 18. a pH monitor meter; 19. and a stop valve.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, a system for recycling and treating regenerated wastewater after brine refining comprises two wastewater discharge pipes 1 for discharging denitration concentrated solution and regenerated wastewater of a chelate resin tower respectively; the waste water discharge pipe 1 is communicated with the miscellaneous discharge recovery tank 2; the miscellaneous discharge recovery pond 2 is communicated with a water diversion tank 4 through a water conveying pipeline 3; the water diversion tank 4 is communicated with the circulating output system 5 through a water conveying pipeline 3; the circulation output system 5 comprises two wastewater treatment pumps 6 which are connected in parallel, the inlets of the two wastewater treatment pumps 6 are communicated with the water conveying pipeline 3 through a branch pipe 7, a stop valve 19 for controlling the flow of outlet water is arranged on the branch pipe 7 and the water conveying pipeline 3, and the outlets are communicated with each other through a collecting pipe 8; the collecting pipe 8 is respectively connected with an external discharge pipe and a 9 return pipe 10, the external discharge pipe 9 directly discharges the treated wastewater, the return pipe 10 is a return branch and is communicated with the miscellaneous discharge recovery tank 2, and part of the neutralized wastewater is led into the miscellaneous discharge recovery tank 2 again for recycling.

Furthermore, the miscellaneous discharge recovery tank 2 is a semi-underground tank, so that the occupied area is reduced, the waste water is convenient to collect, and the miscellaneous discharge recovery tank 2 is lined with glass fiber reinforced plastics; a plurality of stirrers 11 and a liquid level meter 12 are also arranged in the impurity discharging and recovering tank 2.

Furthermore, a primary alkali liquor conveying pipe 13 is externally connected to the impurity discharging and recovering tank 2, a stop valve 19 is arranged on the primary alkali liquor conveying pipe 13, alkali liquor is input into the impurity discharging and recovering tank 2 through the primary alkali liquor conveying pipe 13 to adjust the pH value of the wastewater to be 4-5, at the moment, the amount of the wastewater in the impurity discharging and recovering tank 2 is large, only integral pretreatment is needed to be carried out on the wastewater, the wastewater is buffered, and the requirement of subsequent neutralization treatment of a large amount of acidic wastewater is met; the diversion tank 4 is externally connected with a secondary alkali liquor conveying pipe 14, a stop valve 19 is also arranged on the secondary alkali liquor conveying pipe 14, alkali liquor is input into the diversion tank 4 through the secondary alkali liquor conveying pipe 14 to adjust the pH value of the wastewater to 7-9, at the moment, the diversion tank 4 is used for carrying out finer neutralization adjustment on the input wastewater, and the full process of neutralizing the acidic wastewater is ensured; the whole stage is to carry out neutralization treatment on the wastewater with different concentrations and pH values, so that the whole alkali liquor consumption can be reduced.

Further, a filter 15 with a filter screen is connected in series on the wastewater discharge pipe 1 for discharging the chelate resin tower regeneration wastewater, and a clarifier 16 is connected in series on the wastewater discharge pipe 1 for discharging the denitration concentrated solution; the waste water discharge pipe 1 for discharging the regeneration waste water of the chelate resin tower is a CPVC pipe, and the waste water discharge pipe 1 for discharging the denitration concentrated solution is a steel lining PO pipe.

Further, a vent pipe 17 is arranged at the top of the water diversion tank 4, and excess gas in the water diversion tank 4 can be discharged through the vent pipe 17.

Further, a pH monitor 18 is disposed on each of the return pipe 10 and the water tank 4 for real-time monitoring and controlling the pH value of the circulating wastewater flowing through the return pipe 10.

The utility model discloses a theory of operation:

firstly, respectively collecting denitration concentrated solution and regeneration wastewater from a chelate resin tower into an impurity discharge recovery tank 2 through two wastewater discharge pipes 1, opening a stop valve 19 on a primary alkali liquor conveying pipe 13, inputting alkali liquor from the outside into the impurity discharge recovery tank 2 for neutralization reaction, simultaneously opening a stirrer 11 for stirring, and monitoring the pH value in the impurity discharge recovery tank 2 to be 4-5 in real time; then, starting a wastewater treatment pump 6 to pump wastewater in the recovery tank 2 into the diversion tank 4, closing the wastewater treatment pump 6, simultaneously starting a stop valve 19 on a secondary alkali liquor delivery pipe 14, inputting alkali liquor from the outside into the diversion tank 4 to perform neutralization reaction again, and monitoring the pH value of the wastewater in the diversion tank 4 to be 7-9 in real time; and finally, starting the wastewater treatment pump 6 again to discharge the wastewater after the neutralization treatment, wherein part of the wastewater flows back to the impurity discharge recovery tank 2 through the return pipe 10 to be recycled for diluting and neutralizing the wastewater in the impurity discharge recovery tank 2.

The above detailed introduction is made to a system for recycling and treating waste water after brine refining provided by the embodiment of the present invention, and to those skilled in the art, according to the idea of the embodiment of the present invention, there are changes on the specific implementation and application scope, to sum up, the content of this specification should not be understood as the limitation of the present invention.

Claims

1. The utility model provides a regeneration waste water recovery processing system after salt solution is refined which characterized in that: comprises two waste water discharge pipes (1) respectively used for discharging denitration concentrated solution and chelating resin tower regeneration waste water; the waste water discharge pipe (1) is communicated with the miscellaneous discharge recovery tank (2); the impurity discharging and recovering pool (2) is communicated with the water diversion tank (4) through a water conveying pipeline (3); the water diversion tank (4) is communicated with the circulating output system (5) through a water conveying pipeline (3); the circulation output system (5) comprises two wastewater treatment pumps (6) which are connected in parallel, the inlets of the two wastewater treatment pumps (6) are communicated with the water conveying pipeline (3) through branch pipes (7), and the outlets are communicated with each other through a collecting pipe (8); the collecting pipe (8) is respectively connected with an outer discharge pipe (9) and a return pipe (10), the outer discharge pipe (9) directly discharges the treated wastewater, and the return pipe (10) is communicated with the miscellaneous discharge recovery tank (2) for a return branch.

2. The system of claim 1, wherein the system comprises: the miscellaneous discharge recovery tank (2) is a semi-underground tank, and the miscellaneous discharge recovery tank (2) is lined with glass fiber reinforced plastics; a plurality of stirrers (11) and liquid level meters (12) are also arranged in the impurity discharging and recovering pool (2).

3. The system of claim 2, wherein the system comprises: the miscellaneous discharge recovery tank (2) is externally connected with a primary alkali liquor conveying pipe (13), and alkali liquor adjusting wastewater is input into the miscellaneous discharge recovery tank (2) through the primary alkali liquor conveying pipe (13); the water diversion tank (4) is externally connected with a secondary alkali liquor conveying pipe (14), and alkali liquor adjusting wastewater is input into the water diversion tank (4) through the secondary alkali liquor conveying pipe (14).

4. The system of claim 3, wherein the system comprises: a filter (15) with a filter screen is connected in series on the waste water discharge pipe (1) for discharging the regenerated waste water of the chelating resin tower, and a clarifier (16) is connected in series on the waste water discharge pipe (1) for discharging the denitration concentrated solution; the waste water discharge pipe (1) used for discharging the regeneration waste water of the chelating resin tower is a CPVC pipe, and the waste water discharge pipe (1) used for discharging the denitration concentrated solution is a steel lining PO pipe.

5. The system of claim 4, wherein the system comprises: the top of the water diversion tank (4) is provided with a vent pipe (17).

6. The system of claim 5, wherein the system comprises: and pH monitoring meters (18) are arranged on the return pipe (10) and the water diversion tank (4).