Integrated device for simultaneously removing iron and sulfate radicals from cold rolling sulfuric acid wastewater

Abstract

The utility model belongs to the technical field of sewage treatment, and discloses an integrated device for simultaneously removing iron and sulfate radicals from cold rolling sulfuric acid wastewater, which comprises a tank body, a water inlet pipe and a water outlet weir are respectively arranged at two ends of the tank body along the length direction, and a plurality of partition plates are arranged in the middle of the tank body along the length direction in a vertically staggered manner. The tank body is divided into three areas by a plurality of partition plates: an aeration area, a reaction area and a settling area; an aerator, an oxidant adding control valve and a ferrous iron online analyzer are arranged in the aeration area; according to the utility model, through a technology of efficiently converting ferrous iron into ferric iron under an acidic condition and through physical and chemical dual actions, the aeration time is shortened, the equipment volume is reduced, and integration of equipment is facilitated; by adopting low-cost and high-precision control of wastewater treatment and reuse, and through selection and addition control of a reaction agent, one agent can simultaneously realize two functions of neutralization and precipitation reaction, iron and sulfate radicals are removed at the same time, and the salt content of effluent is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, and in particular relates to an integrated device for simultaneously removing iron and sulfate from cold-rolled sulfuric acid wastewater. Background Art

[0002] The steel industry produces a certain amount of sulfuric acid wastewater and hydrochloric acid wastewater in the cold rolling wastewater, collectively known as cold rolling acid wastewater. The usual treatment method for cold rolling acid wastewater is two-stage neutralization + aeration flocculation sedimentation + filtration. The process units are scattered, occupying a large area, and multi-stage lifting is used, which increases energy consumption.

[0003] In the process of treating cold rolling acid wastewater, lime and polyaluminium chloride are generally used as additives. Although pollutants such as iron ions are removed, additional calcium ions and other salts are added to the effluent, increasing the difficulty and cost of subsequent deep reuse treatment. Utility Model Content

[0004] The utility model aims to provide an integrated device for simultaneously removing iron and sulfate from cold-rolled sulfuric acid wastewater, aiming to solve the problems existing in the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An integrated device for simultaneously removing iron and sulfate from cold-rolled sulfuric acid wastewater, comprising a tank body, wherein the two ends of the tank body along the length direction are respectively provided with an inlet pipe and an outlet weir, and the middle part of the tank body is staggered up and down along the length direction thereof, wherein the tank body is divided into three areas by the plurality of partition plates: an aeration area, a reaction area and a precipitation area;

[0007] The aeration zone is provided with an aerator, an oxidant dosing control valve and a divalent iron online analyzer;

[0008] The reaction zone is provided with a reaction reagent dosing control valve, a stirrer, a coagulant reagent dosing control valve, an online conductivity analyzer and a pH online analyzer;

[0009] An online conductivity analyzer is arranged in the sedimentation area, and a sludge reflux discharge system is arranged at the bottom thereof.

[0010] In a preferred embodiment of the present invention, the four partition plates divide the reaction zone into three mutually connected primary reaction zones, secondary reaction zones and tertiary reaction zones.

[0011] In a preferred embodiment of the present utility model, the reaction reagent addition control valve, the agitator, the online conductivity analyzer and the pH online analyzer are both provided in the primary reaction zone and the secondary reaction zone.

[0012] In a preferred embodiment of the present utility model, the coagulant addition control valve and the online conductivity analyzer are provided in the tertiary reaction zone.

[0013] In a preferred embodiment of the utility model, the sludge return discharge system includes a sludge hopper, which is fixedly installed on and connected to the bottom of the sedimentation zone, the bottom of the sludge hopper is connected to the input end of a sludge pump, the output end of the sludge pump is connected to one end of a sludge discharge pipe, the sludge discharge pipe is connected to one end of a sewage return pipe near the sludge pump, and the other end of the sewage return pipe extends to the interior of the primary reaction zone.

[0014] In a preferred embodiment of the utility model, the mud discharge pipe and the sewage return pipe are both provided with stop valves near the intersection.

[0015] In a preferred embodiment of the utility model, the divalent iron online analyzer, the online conductivity analyzer, the pH online analyzer, the oxidant addition control valve and the reactant addition control valve are all electrically connected to the PLC controller through wires.

[0016] The beneficial effects of the utility model are:

[0017] The utility model adopts the technology of efficiently converting divalent iron into trivalent iron under acidic conditions, and reduces aeration time and equipment volume through dual physical and chemical effects, which is conducive to equipment integration; by adopting low-cost and high-precision control of wastewater treatment and reuse, through the selection and addition control of reaction agents, one agent can simultaneously achieve the two functions of neutralization and precipitation reaction, and remove iron and sulfate ions at the same time, reducing the salinity of effluent water. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model.

[0019] Attached figure numbers; among them, 1. aerator; 2. oxidant dosing control valve; 3. aeration zone; 4. divalent iron online analyzer; 5. reaction zone; 6. agitator; 7. reaction agent dosing control valve; 8. pH online analyzer; 9. coagulant dosing control valve; 10. online conductivity analyzer; 11. sedimentation zone; 12. sludge return discharge system; 121. sludge hopper; 122. sludge pump; 123. sludge discharge pipe; 124. sewage return pipe; 13. partition board. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the utility model will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute a limitation of the utility model.

[0021] Example:

[0022] like Figure 1 As shown, this embodiment provides an integrated device for simultaneously removing iron and sulfate from cold-rolled sulfuric acid wastewater, comprising a tank body, wherein water inlet pipes and water outlet weirs are respectively arranged at both ends of the tank body along the length direction, and a plurality of partition plates 13 are staggered up and down in the middle of the tank body along the length direction thereof, and the tank body is divided into three areas by the plurality of partition plates 13: an aeration area 3, a reaction area 5 and a precipitation area 11;

[0023] An aerator 1, an oxidant dosing control valve 2 and a divalent iron online analyzer 4 are provided in the aeration zone 3;

[0024] The reaction zone 5 is provided with a reaction reagent dosing control valve 7, a stirrer 6, a coagulant reagent dosing control valve 9, an online conductivity analyzer 10 and a pH online analyzer 8;

[0025] An online conductivity analyzer 10 is arranged in the sedimentation area 11, and a sludge return discharge system 12 is arranged at the bottom thereof.

[0026] In a preferred embodiment of the present invention, further, four partition plates 13 divide the reaction zone 5 into three mutually connected primary reaction zones, secondary reaction zones and tertiary reaction zones.

[0027] In a preferred embodiment of the present invention, further, both the primary reaction zone 5 and the secondary reaction zone 5 are provided with a reagent dosing control valve 7 , an agitator 6 , an online conductivity analyzer 10 and a pH online analyzer 8 .

[0028] In a preferred embodiment of the present utility model, further, a coagulant dosing control valve 9 and an online conductivity analyzer 10 are provided in the tertiary reaction zone 5 .

[0029] In a preferred embodiment of the utility model, further, the sludge return discharge system 12 includes a sludge hopper 121, which is fixedly installed on the bottom of the sedimentation area 11 and connected thereto, the bottom of the sludge hopper 121 is connected to the input end of the sludge pump 122, the output end of the sludge pump 122 is connected to one end of the sludge discharge pipe 123, the sludge discharge pipe 123 is connected to one end of the sewage return pipe 124 near the sludge pump 122, and the other end of the sewage return pipe 124 extends to the interior of the primary reaction zone 5.

[0030] In a preferred embodiment of the present utility model, further, the mud discharge pipe 123 and the sewage return pipe 124 are both provided with a stop valve near the intersection.

[0031] In a preferred embodiment of the present invention, further, the divalent iron online analyzer 4, the online conductivity analyzer 10, the pH online analyzer 8, the oxidant addition control valve 2 and the reactant addition control valve 7 are all electrically connected to the PLC controller through wires.

[0032] Specifically, this integrated device breaks through the limitations of existing technologies, improves conversion efficiency and ensures equipment integration through the superposition of multiple divalent iron to trivalent iron conversion methods; and through the selection and precise control of reagents, it can simultaneously remove iron and sulfate, reduce the salt content of effluent, and thus ensure that the effluent meets the requirements for reuse;

[0033] The main function of aeration zone 3 is to efficiently convert divalent iron into trivalent iron through physical and chemical effects;

[0034] The aerator 1 adopts a corrosion-resistant mechanical aerator with higher oxygen transfer efficiency. On the one hand, the aerator 1 can provide sufficient oxygen for converting divalent iron into trivalent iron, and on the other hand, it can play a sufficient stirring role to ensure that the aeration area 3 is not deposited.

[0035] The oxidant addition control valve 2 is used to enhance the oxidation function of divalent iron, ensure that divalent iron can be efficiently converted into trivalent iron under acidic conditions, reduce the residence time in the aeration zone 3, and control the valve to automatically adjust the opening degree according to the data feedback of the divalent iron online detector 4 at the inlet, so as to achieve accurate addition of the oxidant and reduce the amount of oxidant added.

[0036] Reaction zone 5 is composed of three reaction zones connected in series, and its main function is to ensure that the reaction reagents and coagulants are fully mixed and reacted with the sulfuric acid wastewater after being added to form insoluble iron and sulfate precipitates, thereby achieving the separation of iron and sulfate pollutants from water.

[0037] The reagent addition control valve 7 is arranged in the primary and secondary reaction zones. The reagent control valve in the primary reaction zone is preliminarily adjusted according to the data fed back by the pre-pH online analyzer 8 of the primary reaction zone; the control valve in the secondary reaction zone is finely adjusted according to the data fed back by the pre-online conductivity analyzer 10 of the secondary reaction zone, so as to reduce the dosage of the reagent while ensuring the effluent water quality. The tertiary reaction zone is assisted by the coagulant addition control valve to add the coagulant, so as to improve the sedimentation performance of the precipitate.

[0038] The sedimentation area 11 adopts the form of a high-density sedimentator, equipped with a sludge return and discharge conveying system. The cold-rolled sulfuric acid wastewater, which is fully mixed with the reaction agent and the coagulant agent, settles quietly in the sedimentation area 11 to ensure the separation of water and sediment, and the clean water after desalination flows out from the upper outlet weir for reuse. The sludge produced by the precipitation flows back to the reaction area 5 to ensure that the agents that have not participated in the reaction can continue to participate in the reaction of the system, improve the efficiency of the reaction agents, and reduce the cost of agent addition. The excess sludge enters the sludge return discharge system 12, and after dehydration, it can be used as a chemical and building material raw material for solid waste recycling.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An integrated device for simultaneously removing iron and sulfate from cold-rolled sulfuric acid wastewater, characterized in that: The invention comprises a tank body, wherein the two ends of the tank body along the length direction are respectively provided with a water inlet pipe and a water outlet weir, and the middle part of the tank body is provided with a plurality of partition plates (13) staggered up and down along the length direction, and the tank body is divided into three areas by the plurality of partition plates (13): an aeration area (3), a reaction area (5) and a sedimentation area (11); The aeration zone (3) is provided with an aerator (1), an oxidant dosing control valve (2) and a divalent iron online analyzer (4); The reaction zone (5) is provided with a reaction reagent dosing control valve (7), a stirrer (6), a coagulant reagent dosing control valve (9), an online conductivity analyzer (10) and a pH online analyzer (8); An online conductivity analyzer (10) is arranged in the sedimentation area (11), and a sludge return discharge system (12) is arranged at the bottom thereof.

2. The integrated device for simultaneously removing iron and sulfate from cold-rolled sulfuric acid wastewater according to claim 1, characterized in that: The four partition plates (13) divide the reaction zone (5) into three mutually connected primary reaction zones, a secondary reaction zone and a tertiary reaction zone.

3. The integrated device for simultaneously removing iron and sulfate from cold-rolled sulfuric acid wastewater according to claim 2, characterized in that: The primary reaction zone and the secondary reaction zone are both provided with the reaction reagent dosing control valve (7), the stirrer (6), the online conductivity analyzer (10) and the pH online analyzer (8).

4. The integrated device for simultaneously removing iron and sulfate from cold-rolled sulfuric acid wastewater according to claim 3, characterized in that: The tertiary reaction zone is provided with the coagulant dosing control valve (9) and the online conductivity analyzer (10).

5. The integrated device for simultaneously removing iron and sulfate from cold-rolled sulfuric acid wastewater according to claim 4, characterized in that: The sludge return discharge system (12) comprises a sludge hopper (121), the sludge hopper (121) is fixedly installed at the bottom of the sedimentation zone (11) and is connected thereto, the bottom of the sludge hopper (121) is connected to the input end of a sludge pump (122), the output end of the sludge pump (122) is connected to one end of a sludge discharge pipe (123), the sludge discharge pipe (123) is connected to one end of a sewage return pipe (124) near the sludge pump (122), and the other end of the sewage return pipe (124) extends to the interior of the primary reaction zone.

6. The integrated device for simultaneously removing iron and sulfate from cold-rolled sulfuric acid wastewater according to claim 5, characterized in that: The mud discharge pipe (123) and the sewage return pipe (124) are both provided with stop valves near the intersection.

7. The integrated device for simultaneously removing iron and sulfate from cold-rolled sulfuric acid wastewater according to claim 6, characterized in that: The ferrous iron online analyzer (4), the online conductivity analyzer (10), the pH online analyzer (8), the oxidant dosing control valve (2) and the reagent dosing control valve (7) are all electrically connected to the PLC controller via electric wires.

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