Vanadium-chromium high-ammonia-nitrogen waste liquid treatment device

Abstract

The utility model relates to a vanadium-chromium high ammonia nitrogen waste liquid treatment device which comprises a mixing reaction kettle connected with a waste liquid storage tank, the upper part of the mixing reaction kettle is connected with a ferrous sulfate storage tank, a lime milk storage tank and a PAC storage tank, the lower part of the mixing reaction kettle is connected with a plate-and-frame filter press, and the lower part of the plate-and-frame filter press is also provided with a sewage collection device. The lower part of the sewage collection device is connected with the upper part of the activated carbon adsorption device, and the lower part of the activated carbon adsorption device is connected with the upper part of the ammonia distillation device, so that the treated high-ammonia-nitrogen waste liquid is subjected to harmless treatment of ammonia distillation, and waste liquid, waste gas and waste residues of a system are effectively collected and treated in the whole reaction process; therefore, the vanadium-chromium high-ammonia-nitrogen waste liquid is recycled. The device effectively collects and treats the three wastes in the whole reaction process, and the treatment effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of hazardous waste treatment, in particular to a vanadium-chromium high-ammonia-nitrogen waste liquid treatment device. Background Art

[0002] The main hazard of chromium-containing wastewater is heavy metal pollutants. Chromium exists in the environment mainly in the form of trivalent chromium and hexavalent chromium. The main harmful component is hexavalent chromium. Hexavalent chromium is unstable, toxic and highly oxidizing. It poses a great threat to human life and safety and can cause cancer and mutagenesis. Hexavalent chromium has serious environmental hazards, polluting the soil and water environment and killing fish and shrimp.

[0003] Vanadium is mainly used in industry, and the vanadium-containing wastewater produced can easily cause great adverse effects on the environment. Vanadium-containing wastewater mainly comes from major industries such as iron ore smelting and coal refining and processing. Vanadium exists in water mainly in the form of trivalent vanadium and pentavalent vanadium. Pentavalent vanadium compounds are much more toxic than trivalent vanadium compounds. In normal water quality, the concentration of vanadium is less than 0.05 mg / L. Vanadium can enter the human body through multiple pathways such as the food chain and skin, causing damage to the respiratory system, hematopoietic organs and other functions. Therefore, vanadium-containing wastewater needs attention.

[0004] Electroplating is a process that uses electrochemical methods to decorate, protect and obtain certain new properties on metal and non-metal surfaces. Common electroplating processes include nickel plating, copper plating, gold plating, zinc plating, chrome plating and other processes, among which chrome plating is the most commonly used process. The main source of electroplating chromium-containing wastewater is the plated parts cleaning water.

[0005] At present, the commonly used treatment methods for chromium-containing wastewater at home and abroad include physical method (evaporation concentration method), chemical precipitation method, physical and chemical method (adsorption method, ion exchange resin method, electrolysis method, photocatalysis method), biological method, electrochemical oxidation method, etc. The above methods can treat chromium-containing wastewater, but the cost is too high and a lot of sludge is produced. Summary of the invention

[0006] In order to solve the problems in the background technology, the utility model proposes a vanadium-chromium high-ammonia-nitrogen waste liquid treatment device. The utility model effectively collects and treats the three wastes in the system during the whole reaction process, and the treatment effect is good.

[0007] To solve the above problems, the utility model adopts the following technical scheme: a vanadium-chromium high-ammonia-nitrogen waste liquid treatment device, comprising a storage tank device, a mixing reaction device and a filtering and recovering device, the storage tank device comprising a vanadium-chromium high-ammonia-nitrogen waste liquid storage tank, a ferrous sulfate storage tank, a lime milk storage tank, a PAC storage tank and a sodium hydroxide storage tank arranged in sequence and spaced apart, and respectively connected to multiple feed ports of the mixing reaction device in a one-to-one correspondence, the filtering and recovering device is connected to the discharge port of the mixing reaction device, the filtering and recovering device comprising a plate and frame filter press, a sewage collection device, an activated carbon adsorption device, an internal flow drum microfilter, an ammonia evaporation device and a sewage treatment device connected in sequence.

[0008] Furthermore, the filtering and recovering device also includes a filter residue collecting device, and the filter residue collecting device is connected below the inflow type rotary drum microfilter.

[0009] Furthermore, the mixed reaction device includes a mixed reaction kettle, a stirring device and a pH display meter. The mixed reaction kettle is connected to the storage tank device and the filtering and recovering device. The stirring device and the pH display meter are arranged in the mixed reaction kettle.

[0010] Furthermore, the mixed reaction device also includes an exhaust pipeline and a waste gas treatment device, one end of the exhaust pipeline is connected to the upper part of the mixed reaction kettle, and the other end is connected to the waste gas treatment device.

[0011] Furthermore, the exhaust gas treatment device includes a sulfuric acid solution absorption device, a sodium hydroxide solution absorption device, an activated carbon absorption device and a vacuum pump which are arranged in sequence from the exhaust pipe to the outside.

[0012] Furthermore, the mixed reaction device also includes a cooling water circulation device, which extends from the middle of the outer wall of the mixed reaction kettle to the lower part of the outer wall, and the cooling water circulation device and the outer wall of the mixed reaction kettle are enclosed to form a cooling water circulation cavity, a cooling liquid inlet is opened on the side of the cooling water circulation cavity, and a cooling liquid outlet is opened at the bottom of the cooling water circulation cavity.

[0013] Furthermore, the activated carbon adsorption device includes a cylinder, a spherical spray device and a plurality of drawer-type loading trays. The spherical spray device is arranged in the cylinder and connected to the upper feed port of the cylinder. The plurality of drawer-type loading trays are detachably arranged in the cylinder below the spherical spray device in sequence from top to bottom.

[0014] Furthermore, a first pump is provided on the connecting pipeline between the vanadium-chromium high-ammonia-nitrogen waste liquid storage tank and the mixed reactor, a second pump is provided on the connecting pipeline between the ferrous sulfate storage tank and the mixed reactor, a third pump is provided on the connecting pipeline between the lime milk storage tank and the mixed reactor, a fourth pump is provided on the connecting pipeline between the PAC storage tank and the mixed reactor, a fifth pump is provided on the connecting pipeline between the mixed reactor and the plate-frame filter press, a sixth pump is provided on the connecting pipeline between the sewage collection device and the activated carbon adsorption device, a seventh pump is provided on the pipeline between the water outlet of the activated carbon adsorption device and the inner flow type rotary drum microfilter, an eighth pump is provided on the pipeline between the water outlet of the inner flow type rotary drum microfilter and the ammonia evaporation device, a ninth pump is provided on the pipeline between the water outlet of the ammonia evaporation device and the sewage treatment device, and a tenth pump is provided on the pipeline between the sodium hydroxide storage tank and the upper water inlet of the ammonia evaporation device.

[0015] The beneficial effects of the utility model are as follows: the utility model adds ferrous sulfate to the mixed reaction kettle through a ferrous sulfate storage tank, and the hexavalent chromium oxidizes the divalent iron and is itself reduced to trivalent chromium, thereby achieving the oxidation-reduction of the vanadium-chromium high-ammonia-nitrogen waste liquid; adds a lime milk solution to the waste liquid through a lime milk storage tank to adjust the pH value of the system; then pumps PAC into the waste liquid through a PAC storage tank to make the solution flocculate; passes the mixed solution through a plate and frame filter press to separate the sludge and the filtrate; the filtrate enters a sewage collection device and is adsorbed on the vanadium-containing waste liquid through an activated carbon adsorption device; finally, an ammonia evaporation device is used to perform harmless treatment of the high-ammonia-nitrogen waste liquid after treatment by evaporating ammonia; and effectively collects and treats the system waste liquid, waste gas and waste residue in the whole reaction process, thereby achieving the recovery and utilization of the vanadium-chromium high-ammonia-nitrogen waste liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a structural diagram of the utility model. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] The utility model adds ferrous sulfate to a mixed reaction kettle 15 through a ferrous sulfate storage tank 5, and hexavalent chromium oxidizes divalent iron and is itself reduced to trivalent chromium, thereby achieving oxidation-reduction of vanadium-chromium high-ammonia-nitrogen waste liquid; adds lime milk solution to the waste liquid through a lime milk storage tank 6 to adjust the pH value of the system; then pumps PAC into the waste liquid through a PAC storage tank 7 to make the solution flocculate; passes the mixed solution through a plate-and-frame filter press 8 to separate sludge and filtrate; the filtrate enters a sewage collection device 9 and is adsorbed by an activated carbon adsorption device 10 on the vanadium-containing waste liquid; finally, an ammonia evaporation device 12 is used to perform harmless ammonia evaporation on the high-ammonia-nitrogen waste liquid after treatment; effectively collects and treats the system waste liquid, waste gas and waste residue during the whole reaction process, thereby achieving the recovery and utilization of the vanadium-chromium high-ammonia-nitrogen waste liquid.

[0020] Specifically, a vanadium-chromium high-ammonia-nitrogen waste liquid treatment device comprises a storage tank device 1, a mixing reaction device 2 and a filtering and recovering device 3, wherein the storage tank device 1 comprises a vanadium-chromium high-ammonia-nitrogen waste liquid storage tank 4, a ferrous sulfate storage tank 5, a lime milk storage tank 6, a PAC storage tank 7 and a sodium hydroxide storage tank 17 which are arranged in sequence and are connected one by one to multiple feed ports of the mixing reaction device 2, respectively, the filtering and recovering device 3 is connected to the discharge port of the mixing reaction device 2, and the filtering and recovering device 3 comprises a plate and frame filter press 8, a sewage collection device 9, an activated carbon adsorption device 10, an inflow drum microfilter 11, an ammonia evaporation device 12 and a sewage treatment device 13 which are connected in sequence.

[0021] Furthermore, the ammonia evaporation device 12 is a multi-layer tower type, and the alkaline wastewater flows downward layer by layer in the tower plates of the ammonia evaporation device 12, so that the high-temperature steam directly entering the bottom of the ammonia evaporation device 12 is counter-currently heat-transferred, boiled, and sprayed in each tower plate, so that the ammonia content in the high-ammonia nitrogen wastewater is gradually reduced from top to bottom, until deammonified wastewater with an ammonia nitrogen content of less than 200 mg / L is obtained at the bottom of the ammonia evaporation device 12.

[0022] Furthermore, the filtering recovery device 3 also includes a filter residue collecting device 14 , and the filter residue collecting device 14 is connected below the inflow type rotary drum microfilter 11 .

[0023] Furthermore, the mixed reaction device 2 includes a mixed reaction kettle 15, a stirring device 16 and a pH display meter. The mixed reaction kettle 15 is connected to the storage tank device 1 and the filtering recovery device 3. The stirring device 16 and the pH display meter are arranged in the mixed reaction kettle 15.

[0024] Furthermore, the mixed reaction device 2 also includes an exhaust pipe 18 and an exhaust gas treatment device 19 . One end of the exhaust pipe 18 is connected to the upper part of the mixed reaction kettle 15 , and the other end is connected to the exhaust gas treatment device 19 .

[0025] Furthermore, the waste gas treatment device 19 includes a sulfuric acid solution absorption device 20, a sodium hydroxide solution absorption device 21, an activated carbon absorption device 22 and a vacuum pump 23 which are sequentially arranged from the exhaust pipe 18 outward. The vacuum pump 23 serves to reduce the air pressure of the waste gas treatment device 19 so as to pump the waste gas into the sulfuric acid solution absorption device 20. The waste gas reacts with the sulfuric acid solution and the sodium hydroxide solution in turn, and the waste gas that is not completely absorbed is finally adsorbed by the activated carbon absorption device 22, thereby achieving effective treatment of the waste gas.

[0026] Furthermore, the mixed reaction device 2 also includes a cooling water circulation device 24, which is extended from the middle of the outer wall of the mixed reaction kettle 15 to the lower part of the outer wall, and the cooling water circulation device 24 and the outer wall of the mixed reaction kettle 15 enclose a cooling water circulation chamber 25, and a cooling liquid inlet 26 is provided on the side of the cooling water circulation chamber 25, and a cooling liquid outlet 27 is provided at the bottom of the cooling water circulation chamber 25. That is, cooling water enters the cooling water circulation chamber 25 from the cooling liquid inlet 26, and is used to transfer the heat generated by adding ferrous sulfate and lime milk in the mixed reaction kettle 15 to the cooling water by heat transfer, and discharge the hot water through the cooling liquid outlet 27, so as to control the temperature of the reaction system below 60 degrees Celsius.

[0027] Furthermore, the activated carbon adsorption device 10 includes a cylinder 28, a spherical spray device 29 and a plurality of drawer-type loading trays 30, wherein the spherical spray device 29 is disposed in the cylinder 28 and connected to the upper feed port of the cylinder 28, and the plurality of drawer-type loading trays 30 are detachably disposed in the cylinder 28 below the spherical spray device 29 from top to bottom. By placing the activated carbon in the drawer-type loading tray 30, since the drawer-type loading tray 30 is detachably disposed, it is convenient to replace the activated carbon, and the adsorption effect of the activated carbon adsorption device can be ensured. Specifically, a plurality of spray holes are provided on the surface of the spherical spray device 29, and the vanadium-chromium high-ammonia nitrogen waste liquid can be evenly sprayed on the drawer-type loading tray 30 from the plurality of spray holes of the spherical spray device 29, further improving the adsorption effect of the activated carbon.

[0028] Furthermore, a first pump is provided on the connecting pipeline between the vanadium-chromium high-ammonia nitrogen waste liquid storage tank 4 and the mixed reactor 15, a second pump is provided on the connecting pipeline between the ferrous sulfate storage tank 5 and the mixed reactor 15, a third pump is provided on the connecting pipeline between the lime milk storage tank 6 and the mixed reactor 15, a fourth pump is provided on the connecting pipeline between the PAC storage tank 7 and the mixed reactor 15, a fifth pump is provided on the connecting pipeline between the mixed reactor 15 and the plate-frame filter press 8, and the sewage collection device A sixth pump is arranged on the connecting pipeline between 9 and the activated carbon adsorption device 10, a seventh pump is arranged on the pipeline between the water outlet of the activated carbon adsorption device 10 and the inner-flow rotary drum microfilter 11, an eighth pump is arranged on the pipeline between the water outlet of the inner-flow rotary drum microfilter 11 and the ammonia evaporation device 12, a ninth pump is arranged on the pipeline between the water outlet of the ammonia evaporation device 12 and the sewage treatment device 13, and a tenth pump is arranged on the pipeline between the sodium hydroxide storage tank 17 and the upper water inlet of the ammonia evaporation device 12.

[0029] The utility model adds ferrous sulfate to a mixed reaction kettle 15 through a ferrous sulfate storage tank 5, and hexavalent chromium oxidizes divalent iron and is itself reduced to trivalent chromium, thereby achieving oxidation-reduction of vanadium-chromium high-ammonia-nitrogen waste liquid; adds lime milk solution to the waste liquid through a lime milk storage tank 6 to adjust the pH value of the system; then pumps PAC into the waste liquid through a PAC storage tank 7 to make the solution flocculate; passes the mixed solution through a plate-and-frame filter press 8 to separate sludge and filtrate; the filtrate enters a sewage collection device 9 and is adsorbed by an activated carbon adsorption device 10 on the vanadium-containing waste liquid; finally, an ammonia evaporation device 12 is used to perform harmless ammonia evaporation on the high-ammonia-nitrogen waste liquid after treatment; effectively collects and treats the system waste liquid, waste gas and waste residue during the whole reaction process, thereby achieving the recovery and utilization of the vanadium-chromium high-ammonia-nitrogen waste liquid.

[0030] The specific principle is as follows:

[0031] Cr2O7 2- +6Fe 2+ +14H + ==2Cr 3+ +6Fe 3+ +7H2O.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vanadium-chromium high-ammonia-nitrogen waste liquid treatment device, characterized in that: The invention comprises a storage tank device (1), a mixing reaction device (2) and a filtering and recovering device (3), wherein the storage tank device (1) comprises a vanadium-chromium high-ammonia-nitrogen waste liquid storage tank (4), a ferrous sulfate storage tank (5), a lime milk storage tank (6), a PAC storage tank (7) and a sodium hydroxide storage tank (17) which are arranged in sequence and are connected to a plurality of feed ports of the mixing reaction device (2) in a one-to-one correspondence, respectively; the filtering and recovering device (3) is connected to a discharge port of the mixing reaction device (2), and the filtering and recovering device (3) comprises a plate and frame filter press (8), a sewage collection device (9), an activated carbon adsorption device (10), an inflow-type rotary drum microfilter (11), an ammonia evaporation device (12) and a sewage treatment device (13) which are connected in sequence.

2. A vanadium-chromium high-ammonia-nitrogen waste liquid treatment device according to claim 1, characterized in that: The filtering recovery device (3) further comprises a filter residue collecting device (14), wherein the filter residue collecting device (14) is connected below the internal flow type rotary drum microfilter (11).

3. A vanadium-chromium high-ammonia-nitrogen waste liquid treatment device according to claim 1, characterized in that: The mixing reaction device (2) comprises a mixing reaction kettle (15), a stirring device (16) and a pH display meter. The mixing reaction kettle (15) is connected to the storage tank device (1) and the filtering recovery device (3). The stirring device (16) and the pH display meter are arranged in the mixing reaction kettle (15).

4. A vanadium-chromium high-ammonia-nitrogen waste liquid treatment device according to claim 3, characterized in that: The mixed reaction device (2) further comprises an exhaust pipeline (18) and an exhaust gas treatment device (19); one end of the exhaust pipeline (18) is connected to the upper part of the mixed reaction kettle (15), and the other end is connected to the exhaust gas treatment device (19).

5. A vanadium-chromium high-ammonia-nitrogen waste liquid treatment device according to claim 4, characterized in that: The exhaust gas treatment device (19) comprises a sulfuric acid solution absorption device (20), a sodium hydroxide solution absorption device (21), an activated carbon absorption device (22) and a vacuum pump (23) which are arranged in sequence outward from the exhaust pipe (18).

6. The device for treating vanadium-chromium high-ammonia-nitrogen waste liquid according to claim 3, characterized in that: The mixing reaction device (2) further comprises a cooling water circulation device (24), wherein the cooling water circulation device (24) is extended from the middle of the outer wall of the mixing reaction kettle (15) to the lower part of the outer wall, and the cooling water circulation device (24) and the outer wall of the mixing reaction kettle (15) are enclosed to form a cooling water circulation chamber (25), a cooling liquid inlet (26) is provided on the side of the cooling water circulation chamber (25), and a cooling liquid outlet (27) is provided at the bottom of the cooling water circulation chamber (25).

7. The device for treating vanadium-chromium high-ammonia-nitrogen waste liquid according to claim 1, characterized in that: The activated carbon adsorption device (10) comprises a cylinder (28), a spherical spray device (29) and a plurality of drawer-type loading trays (30); the spherical spray device (29) is arranged in the cylinder (28) and connected to an upper feed port of the cylinder (28); and the plurality of drawer-type loading trays (30) are detachably arranged in sequence from top to bottom in the cylinder (28) below the spherical spray device (29).

8. The device for treating vanadium-chromium high-ammonia-nitrogen waste liquid according to claim 3, characterized in that: A first pump is provided on the connecting pipeline between the vanadium-chromium high-ammonia nitrogen waste liquid storage tank (4) and the mixing reactor (15); a second pump is provided on the connecting pipeline between the ferrous sulfate storage tank (5) and the mixing reactor (15); a third pump is provided on the connecting pipeline between the lime milk storage tank (6) and the mixing reactor (15); a fourth pump is provided on the connecting pipeline between the PAC storage tank (7) and the mixing reactor (15); a fifth pump is provided on the connecting pipeline between the mixing reactor (15) and the plate-frame filter press (8); and the sewage collection device (9) and the A sixth pump is provided on the connecting pipeline between the activated carbon adsorption device (10), a seventh pump is provided on the pipeline between the water outlet of the activated carbon adsorption device (10) and the inner-flow rotary drum microfilter (11), an eighth pump is provided on the pipeline between the water outlet of the inner-flow rotary drum microfilter (11) and the ammonia evaporation device (12), a ninth pump is provided on the pipeline between the water outlet of the ammonia evaporation device (12) and the sewage treatment device (13), and a tenth pump is provided on the pipeline between the sodium hydroxide storage tank (17) and the upper water inlet of the ammonia evaporation device (12).

Images