Anilinoacetonitrile organic wastewater treatment system

Abstract

The utility model provides an anilinoacetonitrile organic wastewater treatment system. The anilinoacetonitrile organic wastewater treatment system comprises extraction equipment, an adsorption tower, an ammonia nitrogen stripping tower, an anaerobic sludge reactor and a bioreactor which are sequentially communicated through a water conveying pipeline, the extraction equipment is communicated with a wastewater pipeline, and one end, far away from the extraction equipment, of the wastewater pipeline is communicated with an anilinoacetonitrile organic wastewater production device; the ammonia nitrogen stripping tower is communicated with an alkali liquor pipe, and a first metering pump is arranged on the alkali liquor pipe; the bioreactor is communicated with a standard water pipe and a sludge discharge pipe; wherein water pumps are arranged on the water conveying pipeline and the standard reaching water pipe among the wastewater pipeline, the anaerobic sludge reactor and the bioreactor, and aeration fans are arranged in the ammonia nitrogen stripping tower and the bioreactor. According to the treatment process of the anilinoacetonitrile organic wastewater, the wastewater is prevented from being diluted by at least ten times or more, so that the treatment cost of the anilinoacetonitrile organic wastewater is reduced, and the treatment efficiency of the anilinoacetonitrile organic wastewater is improved.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater treatment, and in particular to a system for treating anilinoacetonitrile organic wastewater. Background Art

[0002] Currently, a large portion of industrial wastewater causing pollution is difficult-to-treat, high-concentration organic wastewater. This type of wastewater primarily comes from industries such as chemicals, synthetic pharmaceuticals, pesticides, grain processing, and coking. Industrial wastewater, with its complex composition, particularly chemical wastewater, has a significant impact on the environment. Take, for example, organic wastewater produced by anilinoacetonitrile.

[0003] Anilinoacetonitrile is a dye intermediate, the final product of which is indigo powder, primarily used for denim dyeing. However, the production process of anilinoacetonitrile produces highly concentrated, toxic, and high-ammonia nitrogen organic wastewater containing anilinoacetonitrile, aniline, and cyanide, with poor biodegradability. Qualitative analysis of the anilinoacetonitrile organic wastewater by mass spectrometry revealed the presence of a large number of substances containing benzene rings in their structures, such as anilinoacetonitrile, aniline, and anilinourea. These substances are highly toxic to microorganisms. This wastewater is typically treated through microbial degradation, which requires dilution of the wastewater at least tenfold during the treatment process. This increases the capital investment in treatment facilities and equipment, and the cost of treating the anilinoacetonitrile organic wastewater. Utility Model Content

[0004] The present application provides an aniline acetonitrile organic wastewater treatment system to solve the technical problems described in the above background technology.

[0005] In order to solve the above technical problems, this application adopts the following technical solutions:

[0006] The present application provides an aniline acetonitrile organic wastewater treatment system, comprising: an extraction device, an adsorption tower, an ammonia nitrogen stripping tower, an anaerobic sludge reactor and a bioreactor, which are sequentially connected through a water pipeline;

[0007] The extraction device is connected to a wastewater pipe, and one end of the wastewater pipe away from the extraction device is used to connect to an anilinoacetonitrile organic wastewater production device;

[0008] The ammonia nitrogen stripping tower is connected to an alkali liquid pipe, and the alkali liquid pipe is provided with a first metering pump;

[0009] The bioreactor is connected with a standard water pipe and a sludge discharge pipe;

[0010] The wastewater pipeline, the water pipeline between the anaerobic sludge reactor and the bioreactor, and the qualified water pipe are all provided with water pumps, and the ammonia nitrogen stripping tower and the bioreactor are both provided with aeration fans.

[0011] Optionally, the extraction equipment includes a primary extraction tank, a secondary extraction tank, and a tertiary extraction tank sequentially connected through the water pipeline;

[0012] The wastewater pipeline is connected to the primary extraction tank, and the water outlet of the tertiary extraction tank is connected to the adsorption tower through the water pipeline;

[0013] The first-stage extraction tank, the second-stage extraction tank and the third-stage extraction tank are all provided with visual observation windows and are connected with light phase drainage pipes, and the light phase drainage pipes are provided with stop valves.

[0014] Optionally, the adsorption tower is filled with an activated carbon layer of a preset height.

[0015] Optionally, the ammonia nitrogen stripping tower is connected to an ammonia pipeline, and one end of the ammonia pipeline away from the ammonia nitrogen stripping tower is connected to an acid liquid storage tank.

[0016] Optionally, the bottom of the sludge discharge pipe is connected to a sludge drying treatment device.

[0017] Optionally, one end of the wastewater pipe away from the extraction device is connected to a pH adjustment tank;

[0018] The pH adjustment tank is connected to a water inlet pipe and an acid-base pipe, and is provided with a pH detection unit and a stirring unit;

[0019] The wastewater pipeline and the acid-base pipe are both provided with flow regulating valves, and the end of the water inlet pipeline away from the pH adjustment tank is used to connect to the anilinoacetonitrile organic wastewater production device.

[0020] The anilinoacetonitrile organic wastewater treatment system provided by the application removes benzene ring substances (e.g., aniline, phenylaminourea, etc.) in the anilinoacetonitrile organic wastewater entering the system from a wastewater pipeline through an extraction device. Nitriles in the anilinoacetonitrile organic wastewater are removed by an adsorption tower. Because the free ammonia nitrogen in the anilinoacetonitrile organic wastewater mainly exists in the form of ammonia under alkaline conditions, in order to effectively remove the free ammonia nitrogen in the anilinoacetonitrile organic wastewater, alkali lye is introduced into an ammonia nitrogen stripping tower through an alkali pipe to convert the free ammonia nitrogen in the anilinoacetonitrile organic wastewater in the ammonia nitrogen stripping tower into ammonia, and then ammonia is removed by an aeration fan in the ammonia nitrogen stripping tower, thereby improving the removal efficiency of the free ammonia nitrogen in the anilinoacetonitrile organic wastewater. Organic matter and nitrogen and phosphorus in the anilinoacetonitrile organic wastewater are removed by an anaerobic sludge reactor. The bioreactor is used to perform periodic aeration and precipitation on the anilinoacetonitrile organic wastewater to decompose the organic matter in the anilinoacetonitrile organic wastewater into harmless carbon dioxide, water, and microbial residues, which are discharged from the sludge discharge pipe. The anilinoacetonitrile organic wastewater undergoes a series of treatments, including extraction, adsorption, ammonia nitrogen stripping, anaerobic sludge reaction, and biological reaction, to obtain water from which benzene ring substances, nitriles, free ammonia nitrogen, nitrogen, phosphorus, and organic matter are removed. The water is then discharged through a qualified water pipe, thereby improving the treatment efficiency of the anilinoacetonitrile organic wastewater. In addition, the present application's treatment process for the anilinoacetonitrile organic wastewater avoids diluting the wastewater by at least ten times, thereby saving the treatment cost of the anilinoacetonitrile organic wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 A flow chart of a system for treating anilinoacetonitrile organic wastewater according to an embodiment of the present application;

[0023] Figure 2 A schematic structural diagram of an anilinoacetonitrile organic wastewater treatment system provided in one embodiment of the present application;

[0024] Figure 3 A schematic structural diagram of an anilinoacetonitrile organic wastewater treatment system provided in another embodiment of the present application;

[0025] Figure 4 A schematic structural diagram of an activated carbon layer of a preset height provided in an adsorption tower according to an embodiment of the present application;

[0026] Figure 5 This is a structural schematic diagram of a pH adjustment tank provided in an embodiment of the present application, in which a stirring unit is provided.

[0027] In the figure: 101, water pipeline; 102, wastewater pipeline; 1021, aniline acetonitrile organic wastewater production device; 103, alkali liquid pipe; 1031, first metering pump; 104, standard water pipe; 105, sludge discharge pipe; 1051, sludge drying equipment; 106, domestic wastewater pipe; 1061, second metering pump; 107, water inlet pipeline; 108, acid and alkali pipe; 1081, flow control valve; 200, extraction equipment; 20 1. Primary extraction tank; 202. Secondary extraction tank; 2021. Visual observation window; 2022. Light phase drain pipe; 2023. Stop valve; 203. Tertiary extraction tank; 300. Adsorption tower; 301. Activated carbon layer; 400. Ammonia nitrogen stripping tower; 401. Ammonia pipeline; 4011. Acid storage tank; 500. Anaerobic sludge reactor; 600. Bioreactor; 700. Water pump; 800. pH adjustment tank; 801. Agitation unit. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application are clearly and completely described below. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts also fall within the scope of protection of this application.

[0029] refer to Figures 1 to 5 The present application provides an aniline acetonitrile organic wastewater treatment system, comprising: an extraction device 200, an adsorption tower 300, an ammonia nitrogen stripping tower 400, an anaerobic sludge reactor 500, and a bioreactor 600, which are sequentially connected through a water pipeline 101;

[0030] Extraction apparatus 200 is connected to a wastewater pipe 102. The end of wastewater pipe 102, remote from extraction apparatus 200, is connected to an anilinoacetonitrile organic wastewater production unit 1021. Extraction apparatus 200 is used to remove benzene ring substances (e.g., aniline, phenylaminourea, etc.) from the anilinoacetonitrile organic wastewater entering the extraction apparatus 200 through wastewater pipe 102. The extractant can be toluene, which has the advantages of large extraction capacity, strong stability, relatively high selectivity, easy recovery, minimal solvent loss, biodegradability, and economical operation.

[0031] The ammonia-nitrogen stripping tower 400 is connected to an alkali liquid pipe 103, which is equipped with a first metering pump 1031. The end of the alkali liquid pipe 103, remote from the ammonia-nitrogen stripping tower 400, is connected to an alkali liquid storage tank. The purpose of the first metering pump 1031 is to pump the alkali liquid stored in the alkali liquid storage tank into the ammonia-nitrogen stripping tower 400 through the alkali liquid pipe 103, thereby converting the free ammonia nitrogen in the anilinoacetonitrile organic wastewater in the ammonia-nitrogen stripping tower 400 into ammonia gas. The specifications and model of the first metering pump 1031 can be set according to actual needs and are not specifically limited herein.

[0032] The bioreactor 600 is connected to a qualified water pipe 104 and a sludge discharge pipe 105. The anaerobic sludge reactor 500 may be an upflow anaerobic sludge blanket (UASB). During operation, sewage enters the bottom of the UASB through uniform water distribution, flowing upward through the UASB to remove organic matter and nitrogen and phosphorus from the anilinoacetonitrile organic wastewater. The bioreactor 600 may be a sequencing batch biofilm reactor (SBBR), a new type of composite biofilm reactor developed with various fillers (such as fiber fillers, activated carbon, and ceramsite). The inclusion of fillers provides a more favorable living environment for microorganisms. Vertically, the microorganisms form a complex ecosystem comprised of multiple trophic levels, including bacteria, fungi, algae, protozoa, and metazoans. Horizontally, along the direction of water flow toward the carrier, a system of suspended aerobic, attached aerobic, attached facultative anoxic, and attached anaerobic microorganisms with diverse activity, respiration, and nutritional profiles is formed, significantly enhancing the reactor's processing capacity and stability. The specifications and models of the upflow anaerobic sludge blanket and sequencing batch biofilm reactors can be customized based on actual needs and are therefore not specifically defined in this application.

[0033] Among them, the wastewater pipeline 102, the water pipeline 101 between the anaerobic sludge reactor 500 and the bioreactor 600, and the qualified water pipe 104 are all equipped with water pumps 700, and the ammonia nitrogen stripping tower 400 and the bioreactor 600 are both equipped with aeration fans.

[0034] The anilinoacetonitrile organic wastewater treatment system provided by the application removes benzene ring substances (e.g., aniline, phenylaminourea, etc.) in the anilinoacetonitrile organic wastewater entering the wastewater pipeline 102 through an extraction device 200. Irrigates in the anilinoacetonitrile organic wastewater are removed by an adsorption tower 300. Since, under alkaline conditions, the free ammonia nitrogen in the anilinoacetonitrile organic wastewater mainly exists in the form of ammonia gas, and in order to effectively remove the free ammonia nitrogen in the anilinoacetonitrile organic wastewater, alkali liquid is introduced into an ammonia nitrogen stripping tower 400 through an alkali liquid pipe 103 to convert the free ammonia nitrogen in the anilinoacetonitrile organic wastewater in the ammonia nitrogen stripping tower 400 into ammonia gas. Ammonia gas is then removed by an aeration fan in the ammonia nitrogen stripping tower 400, thereby improving the removal efficiency of the free ammonia nitrogen in the anilinoacetonitrile organic wastewater. Organic matter and nitrogen and phosphorus in the anilinoacetonitrile organic wastewater are removed by an anaerobic sludge reactor 500. The bioreactor 600 periodically aerates and precipitates the anilinoacetonitrile organic wastewater, decomposing the organic matter in the anilinoacetonitrile organic wastewater into harmless carbon dioxide, water, and microbial residues. The microbial residues are then discharged from the sludge discharge pipe 105. The anilinoacetonitrile organic wastewater undergoes a series of treatments, including extraction, adsorption, ammonia nitrogen stripping, anaerobic sludge reaction, and biological reaction, to obtain water free of benzene ring substances, nitriles, free ammonia nitrogen, nitrogen, phosphorus, and organic matter. This water is then discharged through the qualified water pipe 104, thereby improving the treatment efficiency of the anilinoacetonitrile organic wastewater. Furthermore, the present invention's treatment process for the anilinoacetonitrile organic wastewater avoids diluting the wastewater by at least ten times, thereby saving the cost of treating the anilinoacetonitrile organic wastewater.

[0035] In some embodiments, reference Figure 2 and Figure 3 The extraction equipment 200 in the present application includes a primary extraction tank 201, a secondary extraction tank 202 and a tertiary extraction tank 203 which are sequentially connected through a water pipe 101; the anilinoacetonitrile organic wastewater is extracted sequentially by the primary extraction tank 201, the secondary extraction tank 202 and the tertiary extraction tank 203, so that the benzene ring substances in the anilinoacetonitrile organic wastewater are removed as much as possible, thereby improving the removal rate of the benzene ring substances in the anilinoacetonitrile organic wastewater.

[0036] In addition, the wastewater pipe 102 is connected to the primary extraction tank 201, and the water outlet of the tertiary extraction tank 203 is connected to the adsorption tower 300 through the water supply pipe 101. Specifically, the primary extraction tank 201, the secondary extraction tank 202, and the tertiary extraction tank 203 are each provided with a visual observation window 2021 and are connected to a light phase drain pipe 2022. The light phase drain pipe 2022 is provided with a shut-off valve 2023. The visual observation window 2021 facilitates observation of the stratification of the extracts in the primary extraction tank 201, the secondary extraction tank 202, and the tertiary extraction tank 203, facilitating stratification. The upper layer is the light phase, and the lower layer is the heavy phase. When the extractant is toluene, since toluene has a lower density than water, the upper light phase is a solution of toluene and benzene ring substances, while the lower middle phase is water without benzene ring substances. In the present application, the extractant is usually selected from a solvent with a density less than that of water, so that the water after extraction and separation can be located in the lower layer, making it easier for the water to be discharged from the extraction tank and enter the next reaction process.

[0037] In the above embodiment, the anilinoacetonitrile organic wastewater first enters the first-level extraction tank 201 through the wastewater pipeline 102 on the first-level extraction tank 201, the benzene ring substances in the anilinoacetonitrile organic wastewater are extracted by the first-level extraction tank 201, the heavy phase on the lower floor in the first-level extraction tank 201 is discharged into the second-level extraction tank 202 through the visual observation window 2021, the benzene ring substances in the water entering therein are again extracted by the second-level extraction tank 202, the heavy phase on the lower floor in the second-level extraction tank 202 is discharged into the tertiary extraction tank 203 through the visual observation window 2021, and the benzene ring substances in the water entering therein are further extracted by the tertiary extraction tank 203, so as to remove the benzene ring substances in the anilinoacetonitrile organic wastewater as much as possible. The above process can be discharged through the light phase drain pipe 2022 with the light phase on the upper floor in the corresponding first-level extraction tank 201, the second-level extraction tank 202, and the tertiary extraction tank 203.

[0038] In some embodiments, reference Figure 4 The adsorption tower 300 in the present application is filled with an activated carbon layer 301 of a preset height. The purpose of the preset height of the activated carbon layer 301 is to ensure the adsorption efficiency of the activated carbon layer 301 on the nitrile in the anilinoacetonitrile organic wastewater. Specifically, the preset height can be set according to actual needs, and therefore, the present application does not specifically limit it.

[0039] In the above embodiment, the anilinoacetonitrile organic wastewater (not containing benzene ring substances) extracted by the extraction equipment 200 enters the adsorption tower 300 through the water pipe 101, and the activated carbon layer 301 of a preset height in the adsorption tower 300 adsorbs the nitrile in the anilinoacetonitrile organic wastewater flowing therethrough, thereby removing the nitrile in the anilinoacetonitrile organic wastewater.

[0040] In some embodiments, reference Figure 2 and Figure 3 In the present application, the ammonia stripping tower 400 is connected to an ammonia pipeline 401, and one end of the ammonia pipeline 401 away from the ammonia stripping tower 400 is connected to an acid liquid storage tank 4011. Free ammonia nitrogen in the anilinoacetonitrile organic wastewater in the ammonia stripping tower 400 is converted into ammonia gas under alkaline conditions. The anilinoacetonitrile organic wastewater is aerated by the aeration fan in the ammonia stripping tower 400, so that the ammonia gas in the ammonia stripping tower 400 enters the acid liquid storage tank 4011 through the ammonia pipeline 401. The ammonia gas is absorbed by the acid liquid stored in the acid liquid storage tank 4011. The acid liquid can be a sulfuric acid solution, and the concentration of the acid liquid can be set according to actual needs, which is not specifically limited in the present application.

[0041] In some embodiments, reference Figure 2 and Figure 3 The bottom of the sludge discharge pipe 105 in this application is connected to a sludge drying treatment device 1051. The bioreactor 600 periodically aerates and settles the anilinoacetonitrile organic wastewater, breaking down the organic matter in the anilinoacetonitrile organic wastewater into harmless carbon dioxide, water, and microbial residues. The microbial residues are discharged from the sludge discharge pipe 105 and enter the sludge drying treatment device 1051. The sludge is dried by the sludge drying treatment device 1051, enabling sludge treatment methods such as agricultural use, fuel use, incineration, and even reducing landfill space, thereby providing more possibilities for further use of the sludge. The specifications and model of the sludge drying treatment device 1051 can be set according to actual needs and are not specifically limited in this application.

[0042] In some embodiments, reference Figure 3 In the present application, one end of the wastewater pipe 102 away from the extraction equipment 200 is connected to a pH adjustment tank 800; wherein, the pH of the anilinoacetonitrile wastewater is adjusted by the pH adjustment tank 800 to adjust the pH of the anilinoacetonitrile wastewater to a pH value that is convenient for extraction, and the pH value can be set according to actual needs, and the present application does not make any specific limitations on it.

[0043] Specifically, pH adjustment tank 800 is connected to a water inlet pipe 107 and an acid-base pipe 108, and is provided with a pH detection unit and a stirring unit 801. The acid-base pipe 108 is used to introduce acid or alkali solution into pH adjustment tank 800 to adjust the pH of the anilinoacetonitrile organic wastewater in pH adjustment tank 800 to a pH value suitable for extraction. The pH detection unit can be a pH sensor, and the stirring unit 801 can be a stirring blade.

[0044] Furthermore, flow regulating valves 1081 are provided on the wastewater pipe 102 and the acid-base pipe 108 , and the end of the water inlet pipe 107 away from the pH adjustment tank 800 is used to connect to the anilinoacetonitrile organic wastewater production device 1021 .

[0045] In the above embodiment, the anilinoacetonitrile organic wastewater produced by the anilinoacetonitrile organic wastewater production device 1021 is discharged into the pH adjustment tank 800 through the water inlet pipe 107. The flow rate of the anilinoacetonitrile organic wastewater in the water inlet pipe 107 can be adjusted by the flow regulating valve 1081 on the water inlet pipe 107. Acid or alkali solution is introduced into the pH adjustment tank 800 through the acid-base pipe 108 to adjust the pH of the anilinoacetonitrile organic wastewater in the pH adjustment tank 800 to a pH value that is convenient for extraction. The throttle valve 1081 can adjust the flow rate of the acid or alkali solution in the acid-base pipe 108, so that the acid or alkali solution and the anilinoacetonitrile organic wastewater are mixed in a certain proportion. At the same time, the acid or alkali solution and the anilinoacetonitrile organic wastewater are stirred by the stirring unit 801, so that the acid or alkali solution and the anilinoacetonitrile organic wastewater can be mixed evenly, and the pH of the mixed liquid in the pH adjustment tank 800 is detected by the pH detection unit, so that the pH of the anilinoacetonitrile organic wastewater is adjusted to a pH value that is convenient for extraction, thereby ensuring the extraction efficiency.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A aniline acetonitrile organic wastewater treatment system, characterized in that: include: An extraction device (200), an adsorption tower (300), an ammonia nitrogen stripping tower (400), an anaerobic sludge reactor (500) and a bioreactor (600) are sequentially connected via a water pipeline (101); The extraction device (200) is connected to a wastewater pipe (102), and one end of the wastewater pipe (102) away from the extraction device (200) is used to connect to an anilinoacetonitrile organic wastewater production device (1021); The ammonia nitrogen stripping tower (400) is connected to an alkali liquid pipe (103), and a first metering pump (1031) is provided on the alkali liquid pipe (103); The bioreactor (600) is connected to a standard water pipe (104) and a sludge discharge pipe (105); The wastewater pipeline (102), the water pipeline (101) between the anaerobic sludge reactor (500) and the bioreactor (600), and the qualified water pipe (104) are all provided with a water pump (700), and the ammonia nitrogen stripping tower (400) and the bioreactor (600) are both provided with an aeration fan.

2. The aniline acetonitrile organic wastewater treatment system according to claim 1, characterized in that: The extraction device (200) comprises a primary extraction tank (201), a secondary extraction tank (202) and a tertiary extraction tank (203) which are sequentially connected via the water pipeline (101); The wastewater pipeline (102) is connected to the primary extraction tank (201), and the water outlet of the tertiary extraction tank (203) is connected to the adsorption tower (300) through the water pipeline (101); The first-stage extraction tank (201), the second-stage extraction tank (202) and the third-stage extraction tank (203) are all provided with a visual observation window (2021) and are connected to a light phase drainage pipe (2022), and the light phase drainage pipe (2022) is provided with a stop valve (2023).

3. The aniline acetonitrile organic wastewater treatment system according to claim 1, characterized in that: The adsorption tower (300) is filled with an activated carbon layer (301) of a preset height.

4. The anilinoacetonitrile organic wastewater treatment system according to claim 1, characterized in that: The ammonia nitrogen stripping tower (400) is connected to an ammonia pipeline (401), and one end of the ammonia pipeline (401) away from the ammonia nitrogen stripping tower (400) is connected to an acid liquid storage tank (4011).

5. The anilinoacetonitrile organic wastewater treatment system according to claim 1, characterized in that: The bottom of the sludge discharge pipe (105) is connected to a sludge drying treatment device (1051).

6. The anilinoacetonitrile organic wastewater treatment system according to any one of claims 1 to 5, characterized in that: One end of the wastewater pipe (102) away from the extraction device (200) is connected to a pH adjustment tank (800); The pH adjustment tank (800) is connected to a water inlet pipe (107) and an acid-base pipe (108), and is provided with a pH detection unit and a stirring unit (801); The wastewater pipe (102) and the acid-base pipe (108) are both provided with a flow regulating valve (1081), and the end of the water inlet pipe (107) away from the pH adjustment tank (800) is used to connect to the anilinoacetonitrile organic wastewater production device (1021).

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