Efficient flocculation treatment system for desulfurization wastewater

Abstract

The efficient flocculation treatment system comprises a neutralization tank, a sodium hydroxide dosing tank, an inclined plate settling tank and the like, desulfurization wastewater is communicated to the neutralization tank through a pipeline, the sodium hydroxide dosing tank is communicated to the neutralization tank through a pipeline, a first water pump is installed in the pipeline, the neutralization tank is connected to the inclined plate sedimentation tank through a pipeline, and the organic sulfur dosing tank is communicated to the inclined plate sedimentation tank through a pipeline; the inclined plate sedimentation tank is connected to the flocculation tank through a pipeline; a water pump II is mounted on the pipeline; a magnetic separator is mounted at the lower end of the flocculation box, a flocculant dosing box and a magnetic powder dosing box are communicated to the flocculation box through pipelines, and the flocculation box is connected to a clarifier through a pipeline; the clarifier is connected to the water outlet tank through a pipeline, the sodium hydroxide dosing tank is communicated to the water outlet tank through a pipeline, a third water pump is mounted in the pipeline, and the water outlet tank is communicated to a wastewater treatment station through a pipeline. By using the magnetic flocculation technology, the wastewater treatment speed is increased, the progress of the treatment process flow is accelerated, and meanwhile, automatic control is added, so that the waste of human resources is reduced.

Description

Technical Field

[0001] The utility model relates to the field of desulfurization wastewater treatment, in particular to a novel desulfurization wastewater high-efficiency flocculation treatment system. Background Art

[0002] The composition of desulfurization wastewater is complex and the water quality varies greatly. It mainly contains suspended solids, supersaturated sulfites, sulfates, chloride ions, heavy metals and other impurities. These pollutants are potentially harmful to the environment and human health, so they need to be effectively treated. The traditional desulfurization wastewater treatment process usually adopts a three-tank plus clarifier treatment method. However, this process has the disadvantages of complex process, large equipment investment, high operating cost, many types of reagents, small treatment capacity, and unstable effluent quality.

[0003] In order to solve these problems, a new type of high-efficiency flocculant has emerged in recent years. This flocculant uses rare non-metallic minerals as raw materials and has the advantages of low dosage, difficult release of harmful substances in floccules, and easy dehydration of sludge. However, the flocculation box needs to wait for sedimentation, which leads to a decrease in the overall wastewater treatment rate, affecting the progress of the entire treatment process and failing to timely treat the continuously generated desulfurization wastewater. At the same time, the treatment system requires dedicated personnel to carry out daily operation monitoring and operation, including equipment start and stop, parameter adjustment, and agent addition. This requires operators to have professional knowledge and skills, and to always pay attention to the operating status of the system, resulting in a waste of human resources. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a method for improving the wastewater treatment speed and accelerating the progress of the treatment process by using magnetic flocculation technology, while adding automatic control to reduce the waste of human resources.

[0005] The purpose of the utility model is achieved in this way:

[0006] A desulfurization wastewater high-efficiency flocculation treatment system, comprising a neutralization tank, a sodium hydroxide dosing tank, an inclined plate sedimentation tank, an organic sulfur dosing tank, a flocculation tank, a flocculant dosing tank, a clarifier, and a water outlet tank, characterized in that it also has a magnetic powder dosing tank, a magnetic separator, and a PLC controller; the desulfurization wastewater is connected to the neutralization tank through a pipeline, the sodium hydroxide dosing tank is connected to the neutralization tank through a pipeline, and a water pump is installed in the pipeline, the neutralization tank is connected to the inclined plate sedimentation tank through a pipeline, and the organic sulfur dosing tank is connected to the neutralization tank through a pipeline. The pipeline leads to the inclined plate sedimentation box; the inclined plate sedimentation box is connected to the flocculation box through a pipeline, and a water pump 2 is installed on the pipeline; a magnetic separator is installed at the lower end of the flocculation box, the flocculant dosing box and the magnetic powder dosing box lead to the flocculation box through a pipeline, and the flocculation box is connected to the clarifier through a pipeline; the clarifier is connected to the outlet water tank through a pipeline, the sodium hydroxide dosing box leads to the outlet water tank through a pipeline, and a water pump 3 is installed in the pipeline, and the outlet water tank leads to the wastewater treatment station through a pipeline.

[0007] A stirrer driven by a motor is installed inside the neutralization box.

[0008] A sewage pipe is installed on the lower side of the inclined plate sedimentation box, and the sewage pipe leads to the sludge pool.

[0009] A filter plate is installed in the middle of the inclined plate sedimentation box.

[0010] A sewage pipe is installed at the bottom of the flocculation box, and the sewage pipe leads to the flocculation collection tank.

[0011] PH sensing devices are installed inside the neutralization box and the water outlet tank, and the sensing devices are connected to the PLC controller through signals.

[0012] Valves are installed in the pipelines.

[0013] The valves are all electric valves and are connected to a PLC controller.

[0014] The desulfurization wastewater is directed to the neutralization tank through a pipeline, and then the sodium hydroxide in the sodium hydroxide dosing box is injected into the desulfurization wastewater by starting a water pump, and the agitator is started to accelerate the adjustment of the pH value of the desulfurization wastewater. When the pH value sensed by the pH sensing device in the neutralization tank reaches 8, the signal is transmitted to the PLC controller, and the PLC controller opens the electric valve on the pipeline from the neutralization box to the inclined plate sedimentation box through signal control, and the desulfurization wastewater with adjusted pH flows into the inclined plate sedimentation box under the action of gravity. Under the action of the inclined bottom plate of the inclined plate sedimentation box, the heavier mud and dirt sediments flow into the left end of the inclined plate sedimentation box. When the height of the remaining desulfurization wastewater reaches the upper end of the inclined plate, the electric valve on the organic sulfur dosing box pipeline is opened by the PLC controller, and the organic sulfur is added to the inclined plate sedimentation box under the action of gravity, and forms a stable sulfide precipitate with heavy metal ions under the action of the organic sulfur, thereby reducing the concentration of heavy metal ions in the wastewater. The treated desulfurized wastewater is pumped into the flocculation tank through the water pump 2. At this time, the valve of the flocculant adding box is opened to add flocculants into the flocculation tank to further remove suspended matter, heavy metals and other harmful substances in the desulfurized wastewater. At the same time, the magnetic powder adding box and the magnetic separator are opened. The added magnetic powder has a large specific gravity and can increase the overall density of the flocs. At the same time, the magnetic attraction and large specific surface area of ​​the magnetic powder itself help to increase the probability of suspended matter collision and strengthen the adsorption of pollutants. At the same time, the opened magnetic separator greatly increases the sedimentation rate of the flocs with magnetic powder. The desulfurized wastewater after flocculation treatment is sent to the clarifier for further clarification treatment. The clarified desulfurized wastewater is stored in the outlet water tank. The pH value is determined by the pH sensing device inside the outlet water tank (5). The signal is transmitted to the PLC controller. The PLC controller controls the opening of the water pump 3 through the signal to inject the sodium hydroxide inside the sodium hydroxide adding box into the outlet water tank. After the final pH adjustment, the pH of the desulfurized wastewater reaches 7 and then is sent to the wastewater treatment station. When there is too much sediment in the system, open the pipeline valves of the sludge tank and flocculation collection tank to allow the sludge to be collected in the sludge tank and flocculation collection tank under the action of gravity.

[0015] The beneficial effects of the utility model are:

[0016] By adding magnetic powder, the overall density of flocs is increased. The magnetic attraction and large specific surface area of ​​the magnetic powder itself help to increase the probability of suspended matter collision and strengthen the adsorption of pollutants. At the same time, the opened magnetic separator greatly increases the sedimentation speed of the flocs with magnetic powder, reduces the problem of the overall wastewater treatment speed being reduced due to the need to wait for sedimentation in the flocculation box, and improves the progress of the entire treatment process. At the same time, the PLC controller is added to realize the automatic operation of the entire treatment process, reduce manual intervention, reduce labor costs, and avoid human operation errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a schematic diagram of a high-efficiency flocculation treatment system for desulfurization wastewater involved in the utility model.

[0018] Markings in the figure: 1. Neutralization tank, 2. Inclined plate sedimentation tank, 3. Flocculation tank, 4. Clarifier, 5. Outlet water tank, 6. PLC controller, 11. Mixer, 111. Motor, 12. Sodium hydroxide dosing box, 121. Water pump one, 21. Organic sulfur dosing box, 22. Sludge tank, 23. Filter plate, 31. Flocculant dosing box, 32. Magnetic powder dosing box, 33. Magnetic separator, 34. Flocculation collection tank, 51. Sodium hydroxide dosing box, 511. Water pump three. DETAILED DESCRIPTION

[0019] The utility model patent is further described below in conjunction with the accompanying drawings:

[0020] like Figure 1 As shown, Figure 1 This is a schematic diagram of the condensate recovery system of the gas boiler in this utility model patent. Figure 1 It can be seen that a high-efficiency flocculation treatment system for desulfurized wastewater comprises a neutralization tank (1), a sodium hydroxide dosing tank (12), an inclined plate sedimentation tank (2), an organic sulfur dosing tank (21), a flocculation tank (3), a flocculant dosing tank (31), a magnetic powder dosing tank (32), a magnetic separator (33), a clarifier (4), an outlet water tank (5), and a PLC controller (6); the desulfurized wastewater is connected to the neutralization tank (1) through a pipeline, the sodium hydroxide dosing tank (12) is connected to the neutralization tank (1) through a pipeline, and a water pump (121) is installed in the pipeline, the neutralization tank (1) is connected to the inclined plate sedimentation tank (2) through a pipeline, and the organic sulfur dosing tank (21) is connected to the organic sulfur dosing tank (21) through a pipeline. The pipeline leads to the inclined plate sedimentation box (2); the inclined plate sedimentation box (2) is connected to the flocculation box (3) through a pipeline, and a water pump 2 (301) is installed on the pipeline; a magnetic separator (33) is installed at the lower end of the flocculation box (3), the flocculant dosing box (31) and the magnetic powder dosing box (32) lead to the flocculation box (3) through a pipeline, and the flocculation box (3) is connected to the clarifier (4) through a pipeline; the clarifier (4) is connected to the outlet water tank (5) through a pipeline, the sodium hydroxide dosing box (51) leads to the outlet water tank (5) through a pipeline, and a water pump 3 (511) is installed in the pipeline, and the outlet water tank (5) leads to the wastewater treatment station through a pipeline.

[0021] A stirrer (11) driven by a motor (111) is installed inside the neutralization box (1).

[0022] A sewage pipe is installed on the lower water side of the inclined plate sedimentation box (2), and the sewage pipe leads to the sludge pool (22).

[0023] A filter plate (23) is installed in the middle of the inclined plate sedimentation box (2).

[0024] A sewage discharge pipe is installed at the bottom of the flocculation box (3), and the sewage discharge pipe leads to the flocculation collection tank (34).

[0025] The neutralization box (1) and the water outlet tank (5) are internally installed with pH sensing devices, and the sensing devices are connected to the PLC controller (6) via signals.

[0026] Valves are installed in the pipelines.

[0027] The valves are all electric valves and are connected to a PLC controller (6).

[0028] The desulfurized wastewater is directed to the neutralization tank (1) through a pipeline, and then the sodium hydroxide in the sodium hydroxide dosing tank (12) is injected into the desulfurized wastewater by starting the water pump 1 (121), and the agitator (11) is started to accelerate the adjustment of the pH value of the desulfurized wastewater. When the pH value sensed by the pH sensing device in the neutralization tank (1) reaches 8, a signal is transmitted to the PLC controller (6), and the PLC controller (6) opens the electric valve on the pipeline from the neutralization tank (1) to the inclined plate sedimentation tank (2) through the signal control, and the gravity The desulfurized wastewater with pH adjusted by the action of the sloping plate sedimentation box (2) flows into the inclined plate sedimentation box (2). Under the action of the inclined bottom plate of the inclined plate sedimentation box (2), the heavier mud sediment flows into the left end of the inclined plate sedimentation box (2). When the height of the remaining desulfurized wastewater reaches the upper end of the inclined plate, the electric valve on the pipeline of the organic sulfur dosing box (21) is opened through the PLC controller (6), and the organic sulfur is added to the inclined plate sedimentation box (2) under the action of gravity. Under the action of the organic sulfur, a stable sulfide precipitate is formed with heavy metal ions, thereby reducing the concentration of heavy metal ions in the wastewater. The treated desulfurized wastewater is pumped into the flocculation box (3) through the water pump 2 (301). At this time, the valve of the flocculant dosing box (31) is opened to add flocculant to the flocculation box (3), so as to further remove the suspended matter, heavy metals and other harmful substances in the desulfurized wastewater. At the same time, the magnetic powder dosing box (32) and the magnetic separator (33) are opened. The added magnetic powder has a large specific gravity and can increase the overall density of the flocs. At the same time, the magnetic attraction and large specific surface area of ​​the magnetic powder itself help to increase the probability of suspended matter collision and strengthen the adsorption of pollutants. At the same time, the opened magnetic separator (33) greatly increases the sedimentation speed of the magnetic powder flocs. The desulfurization wastewater after flocculation treatment is sent to the clarifier (4) for further clarification treatment. The clarified desulfurization wastewater is stored in the outlet water tank (5). The pH value is determined by the pH sensing device inside the outlet water tank (5). The signal is transmitted to the PLC controller (6). The PLC controller (6) controls the opening of the water pump 3 (511) through the signal control to inject the sodium hydroxide inside the sodium hydroxide dosing box (51) into the outlet water tank (5). After the final pH adjustment, the pH of the desulfurization wastewater reaches 7 and then is sent to the wastewater treatment station. When there is too much precipitation in the system, the pipeline valves of the sludge tank (22) and the flocculation collection tank (34) are opened to collect the sludge in the sludge tank (22) and the flocculation collection tank (34) under the action of gravity.

Claims

1. A high-efficiency flocculation treatment system for desulfurized wastewater, comprising a neutralization tank (1), a sodium hydroxide dosing tank (12), an inclined plate sedimentation tank (2), an organic sulfur dosing tank (21), a flocculation tank (3), a flocculant dosing tank (31), a clarifier (4), an outlet water tank (5), characterized in that it also comprises a magnetic powder dosing tank (32), a magnetic separator (33), and a PLC controller (6); the desulfurized wastewater is connected to the neutralization tank (1) through a pipeline, the sodium hydroxide dosing tank (12) is connected to the neutralization tank (1) through a pipeline, and a water pump (121) is installed in the pipeline, the neutralization tank (1) is connected to the inclined plate sedimentation tank (2) through a pipeline, and the organic sulfur dosing tank (21) is connected to the neutralization tank (1) through a pipeline. The inclined plate sedimentation box (2) is connected to the flocculation box (3) through a pipeline; the inclined plate sedimentation box (2) is connected to the flocculation box (3) through a pipeline, and a water pump 2 (301) is installed on the pipeline; a magnetic separator (33) is installed at the lower end of the flocculation box (3); the flocculant dosing box (31) and the magnetic powder dosing box (32) are connected to the flocculation box (3) through a pipeline, and the flocculation box (3) is connected to the clarifier (4) through a pipeline; the clarifier (4) is connected to the outlet water tank (5) through a pipeline, the sodium hydroxide dosing box (51) is connected to the outlet water tank (5) through a pipeline, and a water pump 3 (511) is installed in the pipeline, and the outlet water tank (5) is connected to the wastewater treatment station through a pipeline.

2. A desulfurization wastewater high-efficiency flocculation treatment system according to claim 1, characterized in that A stirrer (11) driven by a motor (111) is installed inside the neutralization box (1).

3. A desulfurization wastewater high-efficiency flocculation treatment system according to claim 1, characterized in that A sewage pipe is installed on the lower water side of the inclined plate sedimentation box (2), and the sewage pipe leads to the sludge pool (22).

4. A desulfurization wastewater high-efficiency flocculation treatment system according to claim 3, characterized in that A filter plate (23) is installed in the middle of the inclined plate sedimentation box (2).

5. A desulfurization wastewater high-efficiency flocculation treatment system according to claim 1, characterized in that A sewage discharge pipe is installed at the bottom of the flocculation box (3), and the sewage discharge pipe leads to the flocculation collection tank (34).

6. A desulfurization wastewater high-efficiency flocculation treatment system according to claim 1, characterized in that The neutralization box (1) and the water outlet tank (5) are internally installed with pH sensing devices, and the sensing devices are connected to the PLC controller (6) via signals.

7. The high-efficiency flocculation treatment system for desulfurization wastewater according to claim 1 is characterized in that Valves are installed in the pipelines.

8. A high-efficiency flocculation treatment system for desulfurization wastewater according to claim 7, characterized in that The valves are all electric valves and are connected to a PLC controller (6).

Images