Integrated waste liquid treatment device

Abstract

The invention provides an integrated waste liquid treatment device. The integrated waste liquid treatment device comprises a reaction tank assembly, the reaction tank assembly comprises a first-stage reaction tank, a second-stage reaction tank, a third-stage reaction tank and a fourth-stage reaction tank which are sequentially arranged in parallel; a first-stage stirring device and a liquid inlet are arranged at the top of the first-stage reaction tank, a desulfurization liquid pipe and an alkali liquid pipe are arranged above the liquid inlet, and the desulfurization liquid pipe and the alkali liquid pipe are communicated through a mixer; a first-stage reaction tank valve plate is arranged at the side part of the first-stage reaction tank, and a first-stage reaction tank overflow port is formed in the bottom of the first-stage reaction tank valve plate; a first-stage reaction tank auger and a first-stage reaction tank bottom discharge valve are sequentially arranged at the bottom of the first-stage reaction tank. According to the invention, multi-stage treatment functions are integrated, continuous, efficient and stable treatment of the wastewater containing the heavy metal desulfurization liquid can be realized, and the problems of large occupied area, high investment and unstable operation of a traditional multi-equipment series connection process are solved.

Description

Technical Field

[0001] This invention belongs to the field of wastewater recycling technology and relates to an integrated waste liquid treatment device. Background Technology

[0002] The flue gas generated during non-ferrous metal smelting often produces a large amount of desulfurization wastewater after desulfurization treatment. This wastewater contains high concentrations of heavy metals such as nickel and copper, as well as toxic elements such as arsenic. If it is not effectively treated, direct discharge will cause serious pollution to water bodies, soil, and the ecological environment, and will not meet the increasingly stringent industrial wastewater discharge standards. In addition, due to the complex forms and large concentration fluctuations of the heavy metals, traditional single treatment methods are difficult to achieve stable discharge or reuse, resulting in the long-term accumulation of this type of wastewater, which has become a major problem restricting the green production and sustainable development of smelting enterprises.

[0003] Currently, the main technologies for treating wastewater containing heavy metals include chemical precipitation, ion exchange, adsorption, membrane separation, and biological methods. Chemical precipitation is widely used due to its simplicity and low cost, but its effectiveness in simultaneously removing multiple heavy metals is limited, and it easily generates large amounts of heavy metal-containing sludge, leading to secondary pollution. Biological methods, especially multi-group coordination technology based on biological agents, have gradually become a research hotspot because they can form stable complexes with various heavy metal ions and achieve selective removal. This technology achieves synergistic purification of multiple metal ions such as nickel, copper, and arsenic through coordination and flocculation of the active groups in the biological agents. However, existing biological agent treatment processes typically rely on multiple reaction devices operating in series, including multi-stage unit operations such as neutralization, oxidation, coordination, and flocculation, resulting in long process flows, large equipment footprints, and high infrastructure and operating costs. Furthermore, problems such as poor material transport, uneven reaction condition control, and poor system stability can easily occur at the junctions of multiple devices, affecting the overall treatment efficiency and stability. Therefore, developing a compact, flexible, and highly integrated treatment device to achieve continuous, efficient, and stable treatment of desulfurization wastewater and meet the requirements for reuse or compliant discharge has become an urgent technical need to be addressed in this field. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing an integrated waste liquid treatment device, which solves the problems of existing multi-group coordination technology based on biological agents requiring multiple devices in series, resulting in large footprint, high investment, and complex operation and control.

[0005] Therefore, the present invention adopts the following technical solution: An integrated waste liquid treatment device, including a reaction tank assembly; wherein: The reaction vessel assembly includes a primary reaction vessel, a secondary reaction vessel, a tertiary reaction vessel, and a quaternary reaction vessel arranged in parallel in sequence.

[0006] The first-stage reaction tank is equipped with a first-stage stirring device and a liquid inlet at the top. Above the liquid inlet are a desulfurization liquid pipe and an alkali liquid pipe, which are connected by a mixer. The first-stage reaction tank is equipped with a valve plate on the side and an overflow port at the bottom of the valve plate. The bottom of the first-stage reaction tank is equipped with a first-stage reaction tank auger and a bottom drain valve in sequence.

[0007] The secondary reaction tank is equipped with a secondary stirring device and a stabilizer inlet at the top, a secondary reaction tank valve plate at the side, and a secondary reaction tank overflow port at the bottom of the valve plate; the bottom of the secondary reaction tank is equipped with a secondary reaction tank auger and a secondary reaction tank bottom drain valve in sequence.

[0008] The three-stage reaction tank is equipped with a three-stage stirring device and a biological agent inlet at the top, a three-stage reaction tank valve plate at the side, and a three-stage reaction tank overflow port at the bottom of the three-stage reaction tank; the bottom of the three-stage reaction tank is equipped with a three-stage reaction tank auger and a three-stage reaction tank bottom drain valve in sequence.

[0009] The four-stage reaction tank is equipped with a four-stage stirring device and a flocculant inlet at the top, a liquid outlet at the side, and a four-stage reaction tank auger and a four-stage reaction tank bottom drain valve at the bottom.

[0010] The primary reaction tank auger includes a spiral shaft, a front tank body, and a rear tank body, with the spiral shaft sequentially inserted into the front and rear tank bodies. The front tank body of the reaction vessel is connected to the outer wall of the spiral shaft by a front reinforcing bottom plate and a front bearing seat, and a front sealing device is provided between the two. The reaction vessel is provided with a rear reinforcing bottom plate and a rear bearing seat at the connection between the rear tank body and the outer wall of the spiral shaft, and a rear sealing device is provided between the two. The front and rear bearing seats are used to fix the spiral shaft; the front and rear sealing devices are used to seal both ends of the spiral shaft to prevent material leakage.

[0011] Specifically, the spiral shaft is connected to the reducer via a coupling; the outer wall of the spiral shaft is provided with a front spiral blade and a rear spiral blade, and the two have opposite spiral directions.

[0012] The augers of the first-stage, second-stage, third-stage, and fourth-stage reactors have the same structure and working principle.

[0013] The beneficial effects of this invention are as follows: This invention achieves continuous wastewater treatment by setting up a multi-stage continuous reaction and an adjustable overflow structure, thereby improving overall treatment efficiency and stability. This allows for the efficient and synergistic removal of heavy metals such as nickel, copper, and arsenic, enabling the desulfurization wastewater to meet discharge standards or be reused. Furthermore, by integrating multi-stage reaction units into one unit, replacing the traditional multi-unit series layout, this invention significantly reduces the floor space required. Specifically: 1. This invention integrates multiple treatment functions such as pH adjustment, oxidation coordination, biological coordination, flocculation and sedimentation into four continuous reaction tanks in one device, replacing the traditional mode of multiple devices connected in series, reducing the equipment footprint and plant space requirements, while also reducing the investment cost of auxiliary facilities such as pipelines, pumps and valves. 2. This invention uses an overflow method to realize the automatic flow of materials between reaction tanks at each level. Combined with in-tank stirring and bottom spiral slag discharge, it realizes a continuous treatment process from water inlet to water outlet, which is stable and reliable in operation and easy to automate. 3. In this invention, each stage of the reaction tank is equipped with a bidirectional spiral slag discharge device at the bottom. The spiral blades in opposite directions can force the sediment at the bottom of the tank to be transported to the central slag discharge port, effectively solving the problems of material accumulation, caking, crystallization and blockage that may be caused by traditional static sedimentation or single spiral, and ensuring the reliability of long-term continuous operation of the device. 4. This invention, by setting adjustable valve plates at each level of overflow outlet, facilitates the adjustment of the liquid level and reaction residence time of each reaction tank, thereby flexibly adapting to changes in operating conditions with different water qualities and treatment requirements, and optimizing the treatment effect. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the reaction vessel assembly in this invention; Figure 2 This is a schematic diagram of the spiral feeding device in this invention.

[0015] In the diagram, 1-first-stage reaction tank, 2-first-stage stirring device, 3-liquid inlet, 4-desulfurization liquid pipe, 5-alkali liquid pipe, 6-mixer, 7-first-stage reaction tank valve plate, 8-first-stage reaction tank overflow port, 9-first-stage reaction tank auger, 10-first-stage reaction tank bottom drain valve, 11-second-stage reaction tank, 12-second-stage stirring device, 13-stabilizer inlet, 14-second-stage reaction tank valve plate, 15-second-stage reaction tank overflow port, 16-second-stage reaction tank auger, 17-second-stage reaction tank bottom drain valve, 18-tertiary reaction tank, 19-tertiary stirring device, 20-biological agent inlet, 21-tertiary reaction tank valve plate, 2 2- Overflow port of the tertiary reactor; 23- Auger of the tertiary reactor; 24- Bottom drain valve of the tertiary reactor; 25- Quaternary reactor; 26- Quaternary stirring device; 27- Flocculant inlet; 28- Liquid outlet; 29- Auger of the tertiary reactor; 30- Bottom drain valve of the tertiary reactor; 31- Reducer; 32- Coupling; 33- Screw shaft; 34- Front bearing housing; 35- Front sealing device; 36- Front helical blade; 37- Rear helical blade; 38- Rear sealing device; 39- Rear bearing housing; 40- Front reinforcing base plate; 41- Front tank body of the reactor; 42- Rear tank body of the reactor; 43- Rear reinforcing base plate. Detailed Implementation

[0016] The technical solution of the present invention will be described below with reference to the accompanying drawings and implementation methods.

[0017] like Figure 1 As shown, the integrated waste liquid treatment device includes a reaction tank assembly, which includes a primary reaction tank 1, a secondary reaction tank 11, a tertiary reaction tank 18, and a quaternary reaction tank 25 arranged in parallel in sequence.

[0018] The first-stage reaction tank 1 is equipped with a first-stage stirring device 2 and a liquid inlet 3 at the top. Above the liquid inlet 3, there are desulfurization liquid pipe 4 and alkali liquid pipe 5, which are connected by a mixer 6. The first-stage reaction tank 1 is equipped with a first-stage reaction tank valve plate 7 on the side, and the first-stage reaction tank overflow port 8 is located at the bottom of the first-stage reaction tank valve plate 7. The first-stage reaction tank auger 9 and the first-stage reaction tank bottom drain valve 10 are arranged in sequence at the bottom of the first-stage reaction tank 1.

[0019] like Figure 2As shown, the primary reaction tank auger 9 includes a spiral shaft 33, a front tank body 41, and a rear tank body 42, with the spiral shaft 33 sequentially inserted into the front tank body 41 and the rear tank body 42. A front reinforcing base plate 40 and a front bearing seat 34 are sequentially provided at the connection between the front tank body 41 and the outer wall of the spiral shaft 33, with a front sealing device 35 between them. A rear reinforcing base plate 43 and a rear bearing seat 39 are provided at the connection between the rear tank body 42 and the outer wall of the spiral shaft 33, with a rear sealing device 38 between them. The outer wall of the spiral shaft 33 is provided with a front spiral blade 36 and a rear spiral blade 37, with opposite spiral directions, forming a reverse conveying of the precipitated material in the reaction tank, sending the precipitated material to the discharge port, preventing the accumulation and crystallization of the precipitated material, and ensuring the continuous and normal operation of the reaction tank.

[0020] The spiral shaft 33 is connected to the reducer 31 via a coupling 32; the front bearing housing 34 and the rear bearing housing 39 are used to fix the spiral shaft 33; the front sealing device 35 and the rear sealing device 38 are used to seal both ends of the spiral shaft 33 to prevent material leakage.

[0021] The augers for the first-stage, second-stage, third-stage, and fourth-stage reactors have the same structure and working principle.

[0022] The secondary reaction tank 11 is equipped with a secondary stirring device 12 and a stabilizer inlet 13 at the top, and a secondary reaction tank valve plate 14 on the side. The secondary reaction tank valve plate 14 is equipped with a secondary reaction tank overflow port 15 at the bottom. The secondary reaction tank 11 is equipped with a secondary reaction tank auger 16 and a secondary reaction tank bottom drain valve 17 in sequence at the bottom.

[0023] The top of the three-stage reaction vessel 18 is equipped with a three-stage stirring device 19 and a biological agent inlet 20, and the side is equipped with a three-stage reaction vessel valve plate 21. The bottom of the three-stage reaction vessel valve plate 21 is equipped with a three-stage reaction vessel overflow port 22. The bottom of the three-stage reaction vessel 18 is equipped with a three-stage reaction vessel auger 23 and a three-stage reaction vessel bottom drain valve 24 in sequence.

[0024] The four-stage reaction tank 25 is equipped with a four-stage stirring device 26 and a flocculant inlet 27 at the top, a liquid outlet 28 on the side, and a four-stage reaction tank auger 29 and a four-stage reaction tank bottom drain valve 30 at the bottom.

[0025] In the process of treating desulfurization liquid containing nickel, copper, and arsenic, the desulfurization liquid and alkali solution enter the mixer 6 through the desulfurization liquid pipe 4 and alkali solution pipe 5, respectively. After mixing and reacting in the mixer 6, the desulfurization liquid and alkali solution enter the primary reaction tank 1 through the inlet 3. Under the action of the primary stirring device 2, the desulfurization liquid and alkali solution continue to mix and react in the primary reaction tank 1, adjusting the pH value of the desulfurization liquid and carrying out sufficient hydrolysis. The precipitate settles to the bottom of the tank and is collected by the primary reaction tank auger 9 to the primary reaction tank bottom drain valve 10. It is then periodically discharged through the primary reaction tank bottom drain valve 8 and enters the next process. The desulfurization liquid completes the hydrolysis process in the primary reaction tank 1. After desulfurization, the wastewater enters the secondary reaction tank 11 through the overflow port 8 of the primary reaction tank. The valve plate 7 of the primary reaction tank adjusts the opening of the overflow port 8 of the primary reaction tank according to the process requirements. The stabilizer enters the secondary reaction tank 11 through the stabilizer inlet 13 and mixes and reacts with the desulfurization liquid at the overflow port 8 of the primary reaction tank. Under the action of the stirring device 12, the desulfurization liquid and the stabilizer continue to mix and react in the secondary reaction tank 11, oxidizing the metal ions in the wastewater and carrying out a complex reaction. The precipitate settles to the bottom of the tank and is collected by the auger 16 of the secondary reaction tank to the bottom drain valve 17 of the secondary reaction tank, and is periodically discharged by the bottom drain valve 17 of the secondary reaction tank.

[0026] After the desulfurization liquid completes the coordination reaction in the secondary reaction tank 11, it enters the tertiary reaction tank 18 through the overflow port 15 of the secondary reaction tank. The valve plate 14 of the secondary reaction tank adjusts the opening of the overflow port 15 of the secondary reaction tank according to the process requirements. The biological agent enters the tertiary reaction tank 18 through the biological agent inlet 20 and mixes and reacts with the desulfurization liquid at the overflow port 15 of the secondary reaction tank. Under the action of the tertiary stirring device 19, the desulfurization liquid and the biological agent continue to mix and carry out coordination reaction in the tertiary reaction tank 18. The heavy metal complex reacts with the multi-group in the biological agent to form particles, which flocculate to form flocs, achieving simultaneous and efficient purification of multiple heavy metal ions, removing Ni, Cu, As, etc. from the wastewater. The precipitate settles to the bottom of the tank and is collected by the auger 23 of the tertiary reaction tank to the bottom drain valve 24 of the tertiary reaction tank, and is periodically discharged by the bottom drain valve 24 of the tertiary reaction tank.

[0027] After the desulfurization liquid completes the reaction in the tertiary reaction tank 18, it enters the quaternary reaction tank 25 through the overflow port 22 of the tertiary reaction tank. The valve plate 21 of the tertiary reaction tank adjusts the opening of the overflow port 22 of the tertiary reaction tank according to the process requirements. The flocculant enters the quaternary reaction tank 25 through the flocculant inlet 27 and mixes with the desulfurization liquid at the overflow port 22 of the tertiary reaction tank. Under the action of the quaternary stirring device 26, the desulfurization liquid and flocculant continue to mix and undergo flocculation reaction in the quaternary reaction tank 25. The precipitate settles to the bottom of the tank and is collected by the auger 29 of the quaternary reaction tank to the bottom drain valve 30 of the quaternary reaction tank. The bottom drain valve 30 of the quaternary reaction tank discharges the precipitate periodically. After the desulfurization liquid is qualified, the outlet 28 is opened to enter the next process.

Claims

1. An integrated waste liquid treatment device, characterized in that, Includes reaction vessel components; wherein: The reaction vessel assembly includes a primary reaction vessel (1), a secondary reaction vessel (11), a tertiary reaction vessel (18), and a quaternary reaction vessel (25) arranged in parallel in sequence. The first-stage reaction tank (1) is equipped with a first-stage stirring device (2) and a liquid inlet (3) at the top. Above the liquid inlet (3) are a desulfurization liquid pipe (4) and an alkali liquid pipe (5), which are connected by a mixer (6). The first-stage reaction tank (1) is equipped with a first-stage reaction tank valve plate (7) on the side. The first-stage reaction tank valve plate (7) is equipped with a first-stage reaction tank overflow port (8) at the bottom. The first-stage reaction tank (1) is equipped with a first-stage reaction tank auger (9) and a first-stage reaction tank bottom drain valve (10) in sequence at the bottom. The primary reaction tank auger (9) includes a spiral shaft (33), a front tank body (41) and a rear tank body (42), and the spiral shaft (33) is inserted into the front tank body (41) and the rear tank body (42) in sequence. The front tank body (41) of the reaction vessel is connected to the outer wall of the spiral shaft (33) by a front reinforcing bottom plate (40) and a front bearing seat (34) in sequence, and a front sealing device (35) is provided between the two. The rear tank body (42) of the reaction vessel is provided with a rear reinforcing bottom plate (43) and a rear bearing seat (39) at the connection between the outer wall of the spiral shaft (33), and a rear sealing device (38) is provided between the two. The outer wall of the spiral shaft (33) is provided with a front spiral blade (36) and a rear spiral blade (37), and the two spiral directions are opposite.

2. The apparatus according to claim 1, characterized in that, The secondary reaction tank (11) is equipped with a secondary stirring device (12) and a stabilizer inlet (13) at the top, and a secondary reaction tank valve plate (14) on the side. The secondary reaction tank overflow port (15) is provided at the bottom of the secondary reaction tank valve plate (14). The secondary reaction tank (11) is equipped with a secondary reaction tank auger (16) and a secondary reaction tank bottom drain valve (17) in sequence at the bottom.

3. The apparatus according to claim 1, characterized in that, The three-stage reaction tank (18) is equipped with a three-stage stirring device (19) and a biological agent inlet (20) at the top, and a three-stage reaction tank valve plate (21) is provided on the side. The three-stage reaction tank overflow port (22) is provided at the bottom of the three-stage reaction tank valve plate (21). The bottom of the three-stage reaction tank (18) is equipped with a three-stage reaction tank auger (23) and a three-stage reaction tank bottom drain valve (24) in sequence.

4. The apparatus according to claim 1, characterized in that, The four-stage reaction tank (25) is equipped with a four-stage stirring device (26) and a flocculant inlet (27) at the top, a liquid outlet (28) at the side, and a four-stage reaction tank auger (29) and a four-stage reaction tank bottom drain valve (30) at the bottom.

5. The apparatus according to claim 1, characterized in that, The spiral shaft (33) is connected to the reducer (31) via a coupling (32).

6. The apparatus according to claim 1, characterized in that, The front bearing housing (34) and the rear bearing housing (39) are used to fix the helical shaft (33).

7. The apparatus according to claim 1, characterized in that, The front sealing device (35) and the rear sealing device (38) are used to seal both ends of the spiral shaft (33) to prevent material leakage.

8. The apparatus according to claim 1, characterized in that, The structure and working principle of the first-stage reactor auger (9), the second-stage reactor auger (16), the third-stage reactor auger (23), and the fourth-stage reactor auger (29) are all the same.

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