Wastewater treatment system

Abstract

A wastewater treatment system comprises a dehydrating tower, an adjusting tank, a nitrogen ejector, an anaerobic tank, an aerobic tank, a settling tank and a buffer tank, a feed port of the adjusting tank is connected with a sulfur-containing wastewater source, an emergency tank wastewater source and a tower kettle liquid outlet of the dehydrating tower, a discharge port of the adjusting tank supplies materials to the anaerobic tank through a first pipeline, a feed port of the dehydrating tower is connected with salt-containing wastewater, and a discharge port of the dehydrating tower is connected with a second pipeline. A material inlet of the nitrogen ejector is connected with the adjusting tank through a second pipeline and located above the liquid level, a material outlet supplies materials to the incinerator, an overflow port of the anaerobic tank supplies materials to the aerobic tank through a fourth pipeline, an aeration pipeline of the aerobic tank is connected with an instrument gas source and an oxygen source, and the overflow port supplies materials to the sedimentation tank through a third pipeline; at least two layers of partition plates are arranged in the length direction of the sedimentation tank at intervals, each partition plate is provided with an overflow channel, and an overflow port of the sedimentation tank discharges treated wastewater through the buffer tank. The device is simple in structure and convenient to operate, and can effectively meet the requirements of energy conservation and environmental protection.

Description

Technical Field

[0001] The utility model relates to the field of chemical industry, in particular to a wastewater treatment system. Background Art

[0002] The sulfur-containing wastewater from the carbon disulfide unit, the salt-containing wastewater from the dimethyl sulfoxide unit and the wastewater from the accident emergency pool configured by the chemical company are buffered and mixed in a multi-stage regulating tank, and then sent to the bottom of the anaerobic tank for anaerobic treatment. The wastewater in the anaerobic tank overflows to the aerobic tank, and is aerated (aeration fan) aerobically treated in the oxidation tank. It then enters the sedimentation tank through overflow, and the supernatant enters the buffer tank. After qualified analysis, it enters the landscape pool and meets the discharge standards after online detection.

[0003] In order to reduce the load on the anaerobic tank and aerobic tank, the sulfur-containing wastewater from the carbon disulfide unit is first blown off in a stripping tower to reduce the content of toxic and harmful gases, and the salt-containing wastewater from the dimethyl sulfoxide unit is passed through a photocatalyst to reduce the COD content.

[0004] This operation has the following problems and disadvantages:

[0005] 1. The stripping tower desulfurizes the sulfur-containing wastewater, and the production area has a heavy odor; 3. The sedimentation effect of the wastewater in the sedimentation tank is poor, and the turbidity of the external drainage is high; 3. The photocatalyst and aeration fan have high energy consumption.

[0006] Therefore, how to design a wastewater treatment device that can solve the above-mentioned defects is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0007] The purpose of the utility model is to provide a wastewater treatment system in view of the deficiencies in the prior art, which has a simple structure, is easy to operate, and can effectively meet the needs of energy conservation and environmental protection.

[0008] The technical scheme of the utility model is: a wastewater treatment system, including a dehydration tower, a regulating tank, a nitrogen injector, an anaerobic tank, an aerobic tank, a sedimentation tank, and a buffer tank. The regulating tank is sealed, the feed inlet of the regulating tank is connected to the sulfur-containing wastewater source of the carbon disulfide device, the wastewater source of the accident emergency tank, and the tower bottom liquid outlet of the dehydration tower, the discharge port of the regulating tank supplies the anaerobic tank through a first pipeline, the feed inlet of the dehydration tower is connected to the salt-containing wastewater of the dimethyl sulfoxide device, and the material inlet of the nitrogen injector is connected to the regulating tank through a second pipeline. The material outlet of the nitrogen injector supplies the incinerator, the overflow of the anaerobic tank supplies the aerobic tank through the fourth pipeline, the aeration pipeline of the aerobic tank is connected to the instrument air source and the oxygen source, the overflow of the aerobic tank supplies the sedimentation tank through the third pipeline, at least two layers of partitions are arranged at intervals along the length direction of the sedimentation tank, each partition is provided with an overflow channel, and the overflow channel located downstream is lower than the height of the overflow channel located upstream, and the overflow of the sedimentation tank discharges the treated wastewater to the outside through the buffer tank.

[0009] There are two baffles in the sedimentation tank, and the height of the overflow channel on the downstream baffle is 5 cm lower than the overflow channel on the upstream baffle.

[0010] The aeration pipeline of the aerobic tank is also connected with an aeration fan.

[0011] The upstream end of the second pipeline is connected to the overflow port of the anaerobic tank, and the downstream end is connected to the regulating tank to form a circulation. A diversion pipeline is arranged on the second pipeline to connect to the aerobic tank.

[0012] The bottom of the sedimentation tank is connected to the regulating tank via a filter press.

[0013] The above technical solution has the following beneficial effects:

[0014] 1. The wastewater treatment system includes a dehydration tower, a regulating tank, a nitrogen injector, an anaerobic tank, an aerobic tank, a sedimentation tank, and a buffer tank. The regulating tank is sealed, and the feed port of the regulating tank is connected to the sulfur-containing wastewater source of the carbon disulfide device, the wastewater source of the accident emergency tank, and the bottom liquid outlet of the dehydration tower. The sulfur-containing wastewater, the emergency tank wastewater, and the salt-containing wastewater after dehydration, dedistillation, and COD removal enter the regulating tank for mixing, which effectively reduces the COD value in the regulating tank, thereby reducing the load of the downstream anaerobic tank and aerobic tank. The dehydration tower replaces the photocatalyst, and the dehydration tower can directly use the waste heat of the enterprise's steam coil as a steam source, which can effectively reduce the cost and energy consumption of wastewater treatment. The discharge port of the regulating tank feeds the anaerobic tank through the first pipeline, and the feed port of the dehydration tower is connected to the salt-containing wastewater of the dimethyl sulfoxide device. The material inlet of the nitrogen injector is connected to the regulating tank through the second pipeline, which is located above the liquid level. The material outlet of the nitrogen injector feeds the incinerator. The nitrogen injector is used to draw negative pressure on the regulating tank, so that the odorous gas (sulfide such as hydrogen sulfide) generated in the regulating tank is sent to the incinerator for incineration through the nitrogen injector. The nitrogen injector replaces the stripping tower, and the nitrogen injector can directly use the company's industrial nitrogen as the working medium, which can effectively reduce the cost and energy consumption of wastewater treatment, and effectively reduce the odor on site. The overflow port of the anaerobic tank feeds the aerobic tank through the fourth pipeline. The aeration pipeline of the aerobic tank is connected to the instrument gas source and the oxygen source. The company's industrial instrument gas and industrial oxygen are compounded as the oxygen source of the aerobic tank to replace the aeration fan of the original aerobic tank, which can effectively reduce the cost and energy consumption of wastewater treatment. The overflow of the aerobic tank supplies the sedimentation tank through the third pipeline. The sedimentation tank is provided with at least two layers of partitions at intervals along the length direction. Each partition is provided with an overflow channel, and the overflow channel located downstream is lower than the overflow channel located upstream. The wastewater after anaerobic treatment and aerobic treatment is sent to the sedimentation tank. After multi-stage sedimentation, the sedimentation effect of the wastewater in the sedimentation tank is improved, the clarity of the discharged wastewater is improved, and the interception capacity of anaerobic sludge is improved, and the consumption of anaerobic sludge is reduced. The overflow of the sedimentation tank discharges the treated wastewater to the outside through the buffer tank, and the wastewater index can be tested in the buffer tank to meet environmental protection requirements.

[0015] 2. There are two baffles in the sedimentation tank, and the height of the overflow channel on the downstream baffle is 5 cm lower than the overflow channel on the upstream baffle. This design can not only meet the needs of graded sedimentation, but also reduce the impact strength of the overflow channel on the downstream area, thereby ensuring the wastewater sedimentation effect.

[0016] 3. The aeration pipeline of the aerobic pool is also connected to an aeration fan as a backup oxygen source to meet the actual needs of the enterprise.

[0017] 4. The upstream end of the fourth pipeline is connected to the overflow port of the anaerobic tank, and the downstream end is connected to the regulating tank to form a circulation. A diversion pipeline is arranged on the fourth pipeline to be connected to the aerobic tank, so that the overflow liquid of the anaerobic tank can be circulated between the regulating tank and the anaerobic tank as needed to meet the actual needs of the enterprise.

[0018] Further description is given below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a connection diagram of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the sedimentation tank of the utility model.

[0021] In the attached drawings, 1 is a dehydration tower, 2 is a regulating tank, 3 is a nitrogen injector, 4 is an anaerobic tank, 5 is an aerobic tank, 6 is a sedimentation tank, 61 is a baffle, 62 is an overflow channel, 7 is a buffer tank, 8 is an aeration fan, 9 is a filter press, 101 is a first pipeline, 102 is a second pipeline, 103 is a third pipeline, and 104 is a fourth pipeline. DETAILED DESCRIPTION

[0022] See also Figure 1 and Figure 2, which is a specific embodiment of a wastewater treatment system. The wastewater treatment system includes a dehydration tower 1, a regulating tank 2, a nitrogen injector 3, an anaerobic tank 4, an aerobic tank 5, a sedimentation tank 6, and a buffer tank 7. The regulating tank 2 is sealed, and there are three regulating tanks in series. The feed port of the upstream regulating tank 2 is connected to the sulfur-containing wastewater source of the carbon disulfide device, the wastewater source of the accident emergency tank, and the tower bottom liquid outlet of the dehydration tower 1, and the discharge port of the downstream regulating tank 2 supplies the anaerobic tank 4 through the first pipeline 101. The feed port of the dehydration tower 1 is connected to the salt-containing wastewater of the dimethyl sulfoxide device. The material inlet of the nitrogen injector 3 is connected to the regulating tank 2 through the second pipeline 102, which is located above the liquid level. The material outlet of the nitrogen injector 3 feeds the incinerator. Obviously, the upstream end of the second pipeline is provided with three inlets, which are connected in parallel with each regulating tank. The matching industrial nitrogen is used as the working medium of the nitrogen injector to form a negative pressure above the liquid level of each regulating tank, and the odorous gas volatilized from each regulating tank is extracted and sent to the incinerator for incineration treatment to reduce the odor on site. The overflow port of the anaerobic tank 4 feeds the aerobic tank 5 through the fourth pipeline 104. In this embodiment, the upstream end of the fourth pipeline 104 is connected to the overflow port of the anaerobic tank 4, and the downstream end is connected to the downstream regulating tank 2 to form a cycle. The fourth pipeline 104 is provided with a shunt pipeline connected to the aerobic tank 5. The aeration pipeline of the aerobic tank 5 is connected to the instrument air source and the oxygen source. Usually, the aeration pipeline of the aerobic tank 5 is also connected to an aeration fan 8 as a backup. The overflow port of the aerobic tank 5 supplies the sedimentation tank 6 via the third pipeline 103. The sedimentation tank 6 is provided with at least two layers of partitions 61 at intervals along the length direction, each partition 61 is provided with an overflow channel 62, and the overflow channel located downstream is lower than the overflow channel located upstream. In this embodiment, there are two partitions 61 in the sedimentation tank 6, and the height of the overflow channel on the partition located downstream is 5 cm lower than the overflow channel on the partition located upstream. Specifically, the bottom of the sedimentation tank 6 is connected to the regulating tank 2 via the filter press 9, and the overflow port of the sedimentation tank 6 discharges the treated wastewater to the outside through the buffer tank 7.

[0023] The working principle of the utility model is as follows: the sulfoxide salt-containing wastewater is sent to the dehydration tower, and the volatile organic matter therein is removed and concentratedly treated through distillation to reduce the COD value of the sulfoxide salt-containing wastewater. The sulfur-containing wastewater discharged from the carbon disulfide device, the salt-containing wastewater with reduced COD value, and the wastewater from the accident pool are sent to the regulating pool at the upstream end, the regulating pool at the midstream end, and the regulating pool at the downstream end. After being fully cooled and mixed, they are sent to the anaerobic pool. The volatile odor gas generated in the regulating pool is sent to the incinerator through a nitrogen injector under negative pressure for incineration treatment. The wastewater discharged to the anaerobic pool is anaerobically treated under an anaerobic environment, overflows and flows back to the regulating pool at the downstream end, and part of it is extracted and sent to the aerobic pool. The oxygen source of the aerobic pool is a mixture of instrument gas and industrial oxygen. After the wastewater is aerobically treated in the aerobic pool, it is sent to the sedimentation pool through overflow, and after sedimentation step by step, the clear liquid is sent to the buffer pool through overflow, and its parameters can be monitored online. After passing the test, it is sent to the landscape pool. The mixture at the bottom of the sedimentation tank is sent to the filter press for filtration, and the filtrate is sent to the regulating tank at the downstream end, and the filter cake is outsourced for treatment.

Claims

1. A wastewater treatment system, characterized in that: It includes a dehydration tower (1), a regulating tank (2), a nitrogen injector (3), an anaerobic tank (4), an aerobic tank (5), a sedimentation tank (6), and a buffer tank (7). The regulating tank (2) is sealed, the feed port of the regulating tank (2) is connected to the sulfur-containing wastewater source of the carbon disulfide device, the wastewater source of the accident emergency tank, and the bottom liquid outlet of the dehydration tower (1), the discharge port of the regulating tank (2) supplies the anaerobic tank (4) via the first pipeline (101), and the feed port of the dehydration tower (1) is connected to the salt-containing wastewater of the dimethyl sulfoxide device. The material inlet of the nitrogen injector (3) is connected to the regulating tank (2) through a second pipeline (102) and is located above the liquid level. The material outlet of the nitrogen injector (3) supplies material to the incinerator. The overflow port of the anaerobic tank (4) supplies material to the aerobic tank (5) via a fourth pipeline (104). The aeration pipeline of the aerobic tank (5) is connected to the instrument air source and the oxygen source, and the overflow port of the aerobic tank (5) supplies the sedimentation tank (6) via the third pipeline (103). The sedimentation tank (6) is provided with at least two layers of partitions (61) at intervals along the length direction, each partition (61) is provided with an overflow channel (62), and the overflow channel located downstream is lower than the overflow channel located upstream. The overflow port of the sedimentation tank (6) discharges the treated wastewater to the outside through the buffer tank (7).

2. The wastewater treatment system according to claim 1, characterized in that: There are two baffles (61) in the sedimentation tank (6), and the height of the overflow channel on the downstream baffle is 5 cm lower than the overflow channel on the upstream baffle.

3. The wastewater treatment system according to claim 1, characterized in that: The aeration pipeline of the aerobic tank (5) is also connected to an aeration fan (8).

4. The wastewater treatment system according to claim 1, characterized in that: The upstream end of the fourth pipeline (104) is connected to the overflow port of the anaerobic tank (4), and the downstream end is connected to the regulating tank (2) to form a circulation. A shunt pipeline is arranged on the fourth pipeline (104) to be connected to the aerobic tank (5).

5. The wastewater treatment system according to claim 1, characterized in that: The bottom of the sedimentation tank (6) is connected to the regulating tank (2) via a filter press (9).

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