Treatment device for wastewater containing arsenic and cadmium

Abstract

The utility model relates to the technical field of arsenic-cadmium-containing wastewater treatment, and discloses an arsenic-cadmium-containing wastewater treatment device which comprises a sedimentation tank and a detection tank, and an adsorption tank is connected between the sedimentation tank and the detection tank; the upper end of the sedimentation tank is connected with a conditioning tank, a stirring device and a filter screen are arranged in the sedimentation tank, a motor for driving the stirring device is arranged at the top of the sedimentation tank, and a cabin door is arranged on the side surface of the sedimentation tank; a plurality of siderite filtering layers are arranged in the adsorption tank, and the particle sizes of the siderite filtering layers are gradually reduced from top to bottom; and the upper end of the detection pool is connected with a second comprehensive water quality analyzer. According to the arsenic-cadmium-containing wastewater treatment device, the removal rate of heavy metals in wastewater is increased, the blockage of the whole device is avoided to a great extent, the sewage treatment effect is ensured, the working efficiency of the whole device is high, the labor amount of workers is reduced, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of arsenic cadmium containing wastewater treatment, more particularly to a kind of arsenic cadmium containing wastewater treatment device. BACKGROUND

[0002] In the industrial production process, these wastewaters are usually treated and meet the discharge requirements before being discharged. However, the current wastewater treatment device still has the problems of poor treatment effect, low automation degree and high treatment cost, so the research and development of arsenic cadmium containing wastewater treatment device are particularly urgent. UTILITY MODEL CONTENT

[0003] Therefore, the utility model provides an arsenic cadmium containing wastewater treatment device, which improves the removal rate of heavy metals in wastewater, greatly avoids the blockage of the entire device, ensures the effect of sewage treatment, and has high working efficiency, reduces the labor intensity of workers and reduces costs.

[0004] To achieve the above-mentioned purpose, the arsenic cadmium containing wastewater treatment device provided by the utility model comprises a sedimentation tank and a detection tank, and an adsorption tank is connected between the sedimentation tank and the detection tank.

[0005] The upper end of the sedimentation tank is connected with a conditioning tank, the inside of the sedimentation tank is provided with a stirring device and a filter screen, the top of the sedimentation tank is provided with a motor for driving the stirring device, and the side surface of the sedimentation tank is provided with a hatch.

[0006] The inside of the adsorption tank is provided with multiple layers of siderite filter layers, and the particle sizes of the multiple layers of siderite filter layers gradually decrease from top to bottom.

[0007] The upper end of the detection tank is connected with a second comprehensive water quality analyzer.

[0008] Preferably, the right end of the detection tank is connected with a backwashing device, and the left end of the backwashing device is connected to the pipeline at the left end of the adsorption tank.

[0009] Preferably, the right end of the detection tank is connected with a backflow pipeline, and the left end of the backflow pipeline is connected to the pipeline at the left end of the sedimentation tank.

[0010] Preferably, the left end of the sedimentation tank is connected with an inlet water distribution tank through an industrial wastewater inlet pipe, the industrial wastewater inlet pipe is provided with an inlet water pump, and the left end of the inlet water distribution tank is provided with an arsenic cadmium containing wastewater inlet pipe.

[0011] Preferably, the right end of the detection tank is connected with an outlet water distribution tank.

[0012] Preferably, the stirring device comprises a stirring shaft and stirring blades, and the stirring blades are arranged on the outer peripheral wall of the stirring shaft.

[0013] Preferably, the right end of the sedimentation tank is provided with a vacuum pump.

[0014] Preferably, the upper end of the adsorption tank is provided with a liquid level meter.

[0015] Preferably, the top end of the sedimentation tank is further connected with a first comprehensive water quality analyzer, and the bottom of the sedimentation tank is provided with a support.

[0016] Through the above technical scheme, compared with the prior art, the arsenic and cadmium-containing wastewater treatment device provided by the utility model realizes the removal of part of arsenic and cadmium, improves the treatment efficiency of subsequent wastewater, the stirring device in the sedimentation tank can ensure uniform contact and sufficient reaction between the reactants by fully mixing the industrial wastewater and the conditioning agent, the stirring speed and time should be adjusted according to the actual situation to achieve the best reaction effect, better remove the pollutants in the water, the filter screen in the sedimentation tank can perform subsequent centralized treatment on the precipitate, the filter screen in the adsorption tank can perform re-treatment on the heavy metal arsenic and cadmium in the wastewater, for the general traditional device, when the content of arsenic and cadmium in the wastewater is too high, the sedimentation reaction is often used for removal during treatment, when the concentration of arsenic and cadmium in the wastewater is low, the adsorption reaction is often used for removal during treatment, the advantage of the utility model lies in that the sedimentation reaction and the adsorption reaction are simultaneously used as two removal modes, and the general traditional cadmium-containing wastewater treatment device needs heating during treatment, and the wastewater treatment device does not need heating, which saves the cost and ensures the safety.

[0017] 1、Arsenic and cadmium-containing wastewater inlet water distribution tank, the inlet water distribution tank can store a certain amount of wastewater, avoiding a large amount of arsenic and cadmium-containing wastewater from flowing into the entire treatment device sedimentation tank, and the filter screen in the sedimentation tank can perform subsequent centralized treatment on the precipitate.

[0018] 2、The upper end of the adsorption tank is provided with a liquid level meter, which can detect whether the precipitate on the surface of the filter screen affects the removal effect of heavy metals.

[0019] 3、The upper end of the detection tank is connected with a second comprehensive water quality analyzer, which can determine whether the treated water quality meets the discharge or reuse requirements, if the water quality does not meet the discharge requirements, the wastewater returns to the sedimentation tank for secondary treatment through the backflow pipeline, and the wastewater that meets the detection requirements flows into the outlet water distribution tank for discharge or reuse, and the entire circulation process is automatic, which not only ensures the water quality of the outlet water but also achieves a certain degree of automation.

[0020] 4、The backwashing device is used for flushing the precipitate in the filter screen and the pipeline, so as to maintain the treatment efficiency of the wastewater treatment device.

[0021] 5. The adsorption material selected in this utility model is natural siderite instead of traditional sand, gravel, or synthetic materials. Compared with traditional materials, this material has a lower cost and better adsorption effect. At the same time, multiple siderite filter layers are set in the adsorption tank, and the particle size of each filter screen is different to ensure that the effluent water quality meets the testing standards. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the arsenic and cadmium-containing wastewater treatment device of this utility model.

[0024] Figure 2 This is a schematic diagram of the sedimentation tank of this utility model;

[0025] Figure 3 This is a schematic diagram of the adsorption cell of this utility model;

[0026] Figure 4 This is a comparison diagram showing the effect of the arsenic and cadmium-containing wastewater treatment device of this utility model on arsenic and cadmium-containing wastewater with pH=3 compared to the existing technology.

[0027] Figure 5 This is a comparison diagram showing the effect of the arsenic and cadmium-containing wastewater treatment device of this utility model on arsenic and cadmium-containing wastewater with pH=6 compared with the existing technology.

[0028] Figure 6 This is a comparison diagram showing the effect of the arsenic and cadmium-containing wastewater treatment device of this utility model on arsenic and cadmium-containing wastewater with pH=9 compared to the existing technology.

[0029] Explanation of reference numerals in the attached diagram: Inlet water distribution tank-1; Industrial wastewater inlet pipe-2; Inlet pump-3; Valve-4; Conditioning tank-5; Motor-7; First integrated water quality analyzer-8; Sedimentation tank-9; Filter screen-10; Vacuum pump-11; Door-12; Support-13; Level gauge-14; Adsorption tank-15; Siderite filter layer-16; Second integrated water quality analyzer-17; Detection tank-18; Outlet water distribution tank-19; Backwashing device-20; Return pipe-21; Agitator shaft-22; Agitator blades-23. Detailed Implementation

[0030] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all the embodiments. The description of one exemplary embodiment below is merely illustrative, rather than any limitation on the present utility model and its application or use. Based on the embodiments in the present utility model, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present utility model.

[0031] Please refer to the accompanying Figures 1-3 The present utility model discloses an arsenic and cadmium-containing wastewater treatment device, and the accompanying Figures 4-6 The effect comparison chart of the arsenic and cadmium-containing wastewater treatment device and the original technology applied to three kinds of pH value arsenic and cadmium-containing wastewater.

[0032] As Figure 1 The present utility model provides an arsenic and cadmium-containing wastewater treatment device, which comprises a sedimentation tank 9, an adsorption tank 15 and a detection tank 18, and the adsorption tank 15 is connected between the sedimentation tank 9 and the detection tank 18.

[0033] As Figure 2 The upper end of the sedimentation tank 9 is connected with a conditioning tank 5, the conditioning tank 5 is internally provided with a conditioning agent, the conditioning agent flows into the sedimentation tank 9 and performs a sedimentation reaction with the arsenic and cadmium-containing wastewater in the sedimentation tank 9, so as to realize preliminary treatment of the arsenic and cadmium-containing wastewater.

[0034] The inside of the sedimentation tank 9 is provided with a stirring device and a filter screen 10, the top of the sedimentation tank 9 is provided with a motor 7 for driving the stirring device, the side surface of the sedimentation tank 9 is provided with a hatch 12, the top end of the sedimentation tank 9 is further connected with a first comprehensive water quality analyzer 8, and the bottom of the sedimentation tank 9 is provided with a support 13.

[0035] The stirring device comprises a stirring shaft 22 and stirring blades 23, and the stirring blades 23 are arranged on the outer circumferential wall of the stirring shaft 22.

[0036] As Figure 3 The upper end of the adsorption tank 15 at the right end of the sedimentation tank 9 is provided with a liquid level meter 14, which can accurately detect the pressure difference in the adsorption tank 15, the inside of the adsorption tank 15 is provided with multiple layers of siderite filter layers 16, and the particle size gradually decreases from top to bottom, so as to perform adsorption treatment on the arsenic and cadmium-containing wastewater, and the sedimentation reaction in the sedimentation tank 9 is combined, thereby improving the treatment effect of the arsenic and cadmium-containing wastewater.

[0037] As Figure 1As shown, the upper end of the detection tank 18 is connected with the second comprehensive water quality analyzer 17, the cadmium and arsenic containing wastewater in the adsorption tank 15 enters the detection tank 18, generally, the wastewater is treated by the treatment device and is not detected in water quality, so that whether the discharged water quality reaches the discharge standard cannot be known, the second comprehensive water quality analyzer 17 in the utility model can detect whether the water quality in the detection tank 18 reaches the discharge standard, and the safety of the discharged water quality is ensured.

[0038] In order to further optimize the above technical scheme, the left end of the sedimentation tank 9 is connected with the water inlet distribution tank 1 through the industrial wastewater inlet pipe 2, the water inlet pump 3 is arranged on the industrial wastewater inlet pipe 2, the left end of the water inlet distribution tank 1 is provided with the cadmium and arsenic containing wastewater inlet pipe, and the water inlet distribution tank 1 provides good water absorption conditions for the water inlet pump 3, and meanwhile, the impact of the cadmium and arsenic containing wastewater on the industrial wastewater inlet pipe 2 and the rear structure is avoided; the right end of the detection tank 18 is connected with the water outlet distribution tank 19, and the water outlet distribution tank 19 is used for storing a certain amount of treated wastewater.

[0039] In order to further optimize the above technical scheme, the right end of the sedimentation tank 9 is provided with the vacuum pump 11, so that the cadmium and arsenic containing wastewater in the sedimentation tank 9 is fully mixed with the conditioning agent, the sedimentation effect is good, and meanwhile, the solid-liquid separation effect in the sedimentation tank 9 can be realized.

[0040] In order to further optimize the above technical scheme, the right end of the detection tank 18 is connected with the backwashing device 20, the left end of the backwashing device 20 is connected to the pipeline at the left end of the adsorption tank 15, meanwhile, the right end of the detection tank 18 is connected with the backflow pipeline 21, the left end of the backflow pipeline 21 is connected to the pipeline at the left end of the sedimentation tank 9, the backflow pipeline 21 can help to improve the treatment effect of the whole device, the removal rate of heavy metal ions is improved, and the backwashing device 20 can remove impurities intercepted in the filter material layer (the filter screen 10 and the multi-layer siderite filter layer 16), so that the filter tank restores the filtering capacity in a short time.

[0041] It should be noted that the drainage pump, the valve 4 and other components can be arranged on each connecting pipeline, so as to effectively control the working process of the cadmium and arsenic containing wastewater treatment device.

[0042] The working principle of the cadmium and arsenic containing wastewater treatment device is as follows:

[0043] Arsenic- and cadmium-containing wastewater enters the inlet water distribution tank 1. The conditioning agent contained in the conditioning tank 5 enters the sedimentation tank 9. The stirring device in the sedimentation tank 9 is driven by the motor 7 to fully mix the wastewater and the conditioning agent to cause a sedimentation reaction. The sedimentation effect is good and the efficiency is high, realizing the initial treatment of arsenic- and cadmium-containing wastewater. The filter screen 10 inside the sedimentation tank 9 and the vacuum pump 11 on the right end perform solid-liquid separation of the arsenic- and cadmium-containing wastewater inside the sedimentation tank 9. The whole process is as follows: First, filter cloth is placed on the filter screen 10, the hatch 12 is closed, the stirring device is turned off after stirring evenly, the vacuum pump 11 is turned on to start solid-liquid separation, after the solid-liquid separation is completed, the vacuum pump 11 is turned off, the hatch 12 on the side of the sedimentation tank 9 is opened to remove the filter cloth, and finally the drain pump is turned on to pump the wastewater into the adsorption tank 15.

[0044] Arsenic- and cadmium-containing wastewater entering the adsorption tank 15 undergoes an adsorption reaction through a multi-layer siderite filter layer 16, achieving secondary treatment of the arsenic- and cadmium-containing wastewater. Combined with the sedimentation reaction in the sedimentation tank 9, most heavy metal ions can be removed, improving the wastewater treatment effect and work efficiency. The detection tank 18 tests the treated wastewater to determine whether it meets the discharge standards. If the wastewater does not meet the testing standards, it returns to the sedimentation tank 9 through the return pipe 21 for secondary treatment, improving the removal rate of heavy metals in the wastewater. Wastewater that meets the standards enters the effluent distribution tank 19, which balances the water quality, ensuring the normal operation of the wastewater treatment device and guaranteeing the effluent quality. The backwashing device 20 removes impurities trapped in the filter media layer, allowing the filter to restore its filtration capacity in a short time.

[0045] In this embodiment, the arsenic-cadmium-containing wastewater treatment device of this invention is applied to arsenic-cadmium-containing wastewater with three different pH values. Figures 4-6 As shown (a is pH=3, b is pH=6, c is pH=9), the treatment effect of this device is higher than that of traditional devices. The removal rate of arsenic and cadmium can reach 87%-100%, which proves that this device has extremely high adaptability and treatment performance. Its treatment capacity has reached the international level. Moreover, the process of this device is simple, the cost is low, and it is easy to quantify and produce. This device represents an ideal treatment device for arsenic and cadmium-containing wastewater.

[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An arsenic-containing cadmium wastewater treatment device characterized by comprising: It comprises a sedimentation tank (9) and a detection tank (18), and an adsorption tank (15) is connected between the sedimentation tank (9) and the detection tank (18); The upper end of the sedimentation tank (9) is connected with a conditioning tank (5), the inside of the sedimentation tank (9) is provided with a stirring device and a filter screen (10), the top of the sedimentation tank (9) is provided with a motor (7) for driving the stirring device, and the side of the sedimentation tank (9) is provided with a hatch (12); The inside of the adsorption tank (15) is provided with multiple layers of siderite filter layers (16), and the particle sizes of the multiple layers of siderite filter layers (16) gradually decrease from top to bottom. The upper end of the detection tank (18) is connected with a second comprehensive water quality analyzer (17).

2. The arsenic-containing cadmium wastewater treatment device according to claim 1, characterized by The right end of the detection tank (18) is connected with a backwashing device (20), and the left end of the backwashing device (20) is connected to the pipeline at the left end of the adsorption tank (15).

3. The arsenic-containing cadmium wastewater treatment device according to claim 1 or 2, characterized by The right end of the detection tank (18) is connected with a backflow pipeline (21), and the left end of the backflow pipeline (21) is connected to the pipeline at the left end of the sedimentation tank (9).

4. The arsenic containing cadmium wastewater treatment device of claim 1, wherein, The left end of the sedimentation tank (9) is connected with an inlet water distribution tank (1) through an industrial wastewater inlet pipe (2), the industrial wastewater inlet pipe (2) is provided with an inlet water pump (3), and the left end of the inlet water distribution tank (1) is provided with an arsenic-cadmium-containing wastewater inlet pipe.

5. The arsenic containing cadmium wastewater treatment device of claim 1, wherein, The right end of the detection tank (18) is connected with an outlet water distribution tank (19).

6. The arsenic containing cadmium wastewater treatment device of claim 1, wherein, The stirring device comprises a stirring shaft (22) and stirring blades (23), and the stirring blades (23) are arranged on the outer peripheral wall of the stirring shaft (22).

7. The arsenic containing cadmium wastewater treatment device of claim 1, wherein, The right end of the sedimentation tank (9) is provided with a vacuum pump (11).

8. The arsenic containing cadmium wastewater treatment device of claim 1, wherein, The upper end of the adsorption tank (15) is provided with a liquid level meter (14).

9. The arsenic containing cadmium wastewater treatment device of claim 1, wherein, The top end of the sedimentation tank (9) is also connected with a first comprehensive water quality analyzer (8), and the bottom of the sedimentation tank (9) is provided with a support (13).

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