CN114291916A - System and method for recycling o-aminophenol from o-aminophenol acidification wastewater - Google Patents

Abstract

The invention particularly relates to a method for recovering and treating o-aminophenol in o-aminophenol acidified wastewater, and also relates to improvement of a recovery and treatment system. A recovery processing system of ortho-aminophenol in ortho-aminophenol acidized waste water includes: the system comprises an o-aminophenol acidification wastewater pool, a wastewater filter tank, a macroporous resin adsorption and desorption treatment device, a desorption liquid collection device and a sewage discharge pool; the method comprises the steps of settling and filtering the waste water, adjusting the pH to be 5-6, adsorbing the waste water by a macroporous resin adsorption column, carrying out thermokalite hydrolysis and precipitation after saturation failure, collecting analytic liquid, returning the analytic liquid to a production workshop for cyclic application treatment, and realizing colorless transparency and standard discharge of the waste water after series adsorption treatment, thereby solving the problem that the water treatment of enterprises does not reach the standard, improving the economic benefit to the maximum extent and realizing waste water treatment and resource recycling.

Description

System and method for recovery and treatment of o-aminophenol in o-aminophenol acidification wastewater

technical field

The invention relates to a method for treating wastewater in the production of chemical products, in particular to a method for recovering and treating o-aminophenol in o-aminophenol acidification wastewater, and also relates to the improvement of the structure of a matching recovery and treatment device.

Background technique

Ortho-aminophenol is 2-aminophenol. It is an important pharmaceutical fine chemical intermediate. The chemical formula is CH(OH)NH. It is white or light gray crystalline powder. Dyestuffs, azo dyes, fur dyes and optical brighteners, as well as pharmaceuticals, plastic curing agents, etc. With the rapid development of the pharmaceutical and printing and dyeing industries, the market demand for o-aminophenol, a chemical intermediate, continues to rise, and its price immediately rises However, the current large-scale o-aminophenol production process in China is mainly based on catalytic hydrogenation. The wastewater produced in the production process has high salt content, large water volume, high organic matter concentration, difficult to biochemically and has certain toxicity. Not only It causes the discharge burden of the production enterprise, and the economic loss of the enterprise is caused because the o-aminophenol contained in the production wastewater cannot be recovered. Therefore, the wastewater treatment is imminent.

At present, there are mainly the following processes for o-aminophenol acidification wastewater treatment application: First, activated carbon decolorization combined with Fenton oxidation method, but there is a large amount of sludge that becomes hazardous waste, and the o-aminophenol in the sludge cannot be recycled, resulting in certain The second is the electrochemical oxidation method, which is characterized by a single-chamber reactor composed of a three-dimensional electrode system, and the o-aminophenol wastewater is further treated by the electrochemical oxidation method. However, its process is relatively complicated, and the requirements for personnel and equipment are too high, which leads to limitations in its use; the third is to use the application of Fenton oxidation method to treat o-aminophenol acidification wastewater. This process uses several processes of micro-electrolysis and Fenton oxidation method. The combined treatment method has relatively complex process and relatively difficult operation. During the period, a large amount of corrosive liquids such as acid and alkali are used, which increases the treatment risk, the treatment cost is high, and the treatment efficiency is relatively low.

In recent years, there have been application cases of resins used in the treatment of o-aminophenol wastewater. For example, in the publication number CN102910757A [a process for the treatment of o-nitrophenol production wastewater], a method of treating o-nitrophenol with XDA series macroporous adsorption resins was proposed. The method of producing wastewater, and using ozone to oxidize the remaining organic matter in the adsorption liquid, this method does not activate the resin, so the recovery rate of o-nitrophenol is low, and the treatment cost of ozone oxidation to remove COD is high at the same time. , and has limitations such as limited effects.

The publication number is CN 107129078 A [O-aminophenol wastewater treatment and resource utilization method]. This process combines resin adsorption, micro-electrolysis and Fenton oxidation process to treat the o-aminophenol wastewater and remove it efficiently. o-aminophenol and chroma in wastewater, but the defects of this treatment method are that the process is relatively complicated, the operation is difficult, and a large amount of corrosive liquids such as acid and alkali are used during the period, and the treatment cost is relatively large.

The publication number is CN108793493A [a method for recovering o-aminophenol in concentrated brine], which discloses a method for recycling a large amount of o-aminophenol contained in high-salt wastewater by using a physical adsorption method. After adjusting the pH value of the wastewater from aminophenol production, it is passed into the macroporous styrene-based adsorption resin, and the o-aminophenol is adsorbed on the macroporous styrene-based adsorption resin. Elution, and finally the recovery of o-aminophenol is carried out on the solvent desorbed liquid. This process is mainly aimed at the treatment of high-salt wastewater, and its technical solution has the following drawbacks: (1) It is necessary to adjust the pH to about 2 with concentrated sulfuric acid, that is, under strong acid conditions, and then pass through the adsorption column. The strong acid conditions not only require high equipment, but also have potential safety hazards. 2. adopted organic solvent (indicated to be industrial methanol in the specific embodiment) desorption regeneration after the adsorption is completed, and then needs to increase the rectification system to carry out the recovery process of organic solvent in the later stage, thereby increasing equipment cost and recovery process flow; 3. also need The recovery and treatment of the aminophenol product in the desorption liquid also increases the recovery operation cost.

Therefore, it is particularly important to develop an o-aminophenol process wastewater treatment and recovery method with good treatment effect, low operating cost, simple operation, large amount of o-aminophenol recovery and suitable for industrial-scale treatment.

SUMMARY OF THE INVENTION

In view of the deficiencies in the above-mentioned prior art, the object of the present invention is to provide a recovery and treatment system for o-aminophenol in the o-aminophenol acidification wastewater, which utilizes existing equipment for refit, can realize the treatment of wastewater, and the treatment cost is relatively high. low, the processing efficiency is improved.

The invention also provides a method for recovering o-aminophenol in the o-aminophenol acidification wastewater, which aims to not only solve the problem of enterprise discharge but also save a large amount of water resources, realize environmental management and resource utilization, and greatly improve the efficiency of enterprises. economic benefits.

To achieve the above object, the present invention adopts the following technical solutions, a recovery and treatment system for o-aminophenol in the acidification wastewater of o-aminophenol, comprising:

o-Aminophenol acidified wastewater tank for wastewater storage and sedimentation;

The waste water filter tank is used to filter the settled waste water to a clear, transparent filtrate without floating oil;

The macroporous adsorption resin analysis and treatment device is used to absorb the o-aminophenol contained in the wastewater filtrate. After the adsorption is saturated, the analysis solution is obtained by the hot alkali spraying method;

Analytical liquid collection tank, used to collect the analytical liquid after adsorption and analytical treatment of macroporous resin;

Sewage discharge pool, which is used to discharge wastewater up to the standard or reuse it repeatedly to save water resources;

The wastewater in the o-aminophenol acidification wastewater tank enters the wastewater filter tank after sedimentation, and then enters the macroporous adsorption resin analysis and treatment device after adjusting the pH value. , The analytic solution obtained after washing alkali and acid circulation treatment enters into the analytic solution collection tank, and the treated wastewater that meets the qualified discharge standard enters the sewage discharge tank.

Further, the macroporous adsorption resin analytical treatment device is composed of at least one group of macroporous resin adsorption components, preferably two groups of macroporous resin adsorption components, each group of macroporous resin adsorption components includes three macroporous resin adsorption columns, The three macroporous resin adsorption columns use two adsorption columns in series for adsorption, and another adsorption column for desorption.

Preferably, the macroporous adsorption resin analytical treatment device is composed of 6 macroporous adsorption resin columns, four 1200*3000mm in size and two 1600*3000mm in size, wherein the three 1200*3000 resin columns are One set of macroporous resin adsorption components, another 1200*3000 resin column and two 1600*3000 resin columns are another set of macroporous resin adsorption components.

Preferably, the 1200*3000 size resin column is planned to be packed with 3 square resins, and the 1600*3000 size resin column is packed with 4 square resins.

Preferably, the macroporous adsorption resin columns are all rubber-lined resin columns.

The recovery and treatment method of o-aminophenol in the o-aminophenol acidification wastewater based on the recovery and treatment system of the o-aminophenol in the above-mentioned a kind of o-aminophenol acidification wastewater, specifically comprises the following steps:

S1 Pre-treatment: After the wastewater is settled and filtered (clear and transparent without floating oil), the pH value is adjusted to 5-6, and adjusted to weak acidity, which can remove the alkaline impurities in the wastewater, and is conducive to large pores in an acidic environment The adsorption resin column can better adsorb the o-aminophenol in the wastewater filtrate;

S2 adsorption treatment: adjust the inlet water temperature of the wastewater filtrate to ≥30°C to prevent the crystallization of o-aminophenol from clogging the pipeline. The wastewater filtrate enters a set of macroporous adsorption resin adsorption components through the wastewater pump and the feed pipeline. The components include 1#, 2 #, 3# resin column, the wastewater filtrate first enters the resin column connected in series with 1# and 2# for adsorption, and the adsorbed wastewater filtrate is directly discharged into the sewage discharge tank when the effluent at the bottom of 2# is qualified;

S3 failure treatment: when the effluent at the bottom of the 2# resin column is unqualified, the 1# resin column connected in series with it has failed. At this time, the waste water filtrate is stopped from entering the 1# resin column, and the series connection of 1# and 2# is disconnected. Start the series connection of 2# and 3#, that is, the waste water filtrate enters the resin column of 2# and 3# through the waste water pump and the feed pipeline for adsorption;

S4 backflushing treatment: The 1# resin column that has failed is subjected to forward and reverse water flushing through the circulating water pump and the circulating water pipeline, so as to remove the residual waste water filtrate in the 1# resin channel, and the effluent is discharged into the original pool through the forward and reverse washing pipeline;

S5 Analytical regeneration treatment: Pass the hot alkali liquid in the dilute alkali tank heated to 80 °C into the 1# resin column after backflushing through the alkali feed pump and the alkali feed pipeline. When the water at the bottom of the 1# resin column is alkaline At the same time, the desorption liquid is sent to the desorption liquid collection tank through the desorption liquid pipeline at the bottom of the 1# resin column;

S6 water washing alkali treatment: after the hot lye in step S5 is finished, stop the hot lye from entering the 1# resin column, and open the circulating water pipeline of the 1# resin column for washing, and a part of the washing lye enters the analysis through the analysis solution pipeline. In the liquid collection tank, another part of the washing alkali liquid enters the dilute alkali tank through the analytical liquid pipeline for recycling;

S7 acid circulation treatment: a certain amount of dilute hydrochloric acid is injected into the 1# resin column treated by S6 through the dilute acid pump and the dilute acid pipeline, and circulates for a certain period of time. When the pH in the resin column is about 3, the cycle ends.

Preferably, the inlet water temperature of the regulated wastewater filtrate described in S2 is 30°C-80°C to prevent the crystallization of o-aminophenol from clogging the pipeline.

Further, 1#, 2#, and 3# are separate and independent resin columns, and two are used in series each time. Once the water quality behind the series is found to be unqualified, the previous switch will be invalid immediately, and the other two will be used in series at the same time. , and for the failed ones, circulating water backflushing, hot alkali water analysis, analysis liquid collection, and acid circulation treatment are performed in sequence.

Preferably, the desorption solution in the desorption solution collection tank described in S5 can be directly returned to the production workshop for use, without the need to recycle the finished product, that is, recycling treatment.

Preferably, the alkaline effluent described in S5 refers to when the pH value is 10-12. Specifically, the effluent condition is determined by taking samples from the bottom of the 1# resin column for pH test paper measurement.

Compared with the prior art, the present invention at least has the following beneficial effects:

(1) the present invention brings together the high-concentration o-aminophenol production waste water in the aminophenol acidification waste water and passes through the adsorption column equipped with macroporous resin, so that the o-aminophenol contained in the waste water is adsorbed on the adsorption resin, and the saturated resin is adsorbed through Hot alkaline water is eluted, and the eluted alkaline water containing o-aminophenol can be directly returned to the production workshop for recycling; the physical adsorption and temperature rise analysis methods adopted do not use organic solvent desorption, nor strong acid and alkali, etc., so , greatly reducing the cost of recycling operation;

(2) the present invention adopts two adsorption columns to be connected in series to carry out adsorption, and the other adsorption column is decomposed in the treatment process, which has a simple and reasonable structure, and can not only efficiently recover a large amount of o-aminophenol and chromaticity in the waste water, but also improve the treatment efficiency, At the same time, the wastewater after series adsorption treatment is colorless and translucent, so as to solve the problem of substandard water treatment of enterprises, maximize economic benefits, and realize wastewater treatment and resource recycling;

(3) the analytical solution collected by the present invention through the analytical regeneration treatment, namely the alkaline water eluent containing o-aminophenol, is directly returned to the production workshop for recycling, and the finished product does not need to be recovered, which saves the recovery post-processing equipment and technology. Therefore, greatly The recycling process is simplified, the recycling operation cost is reduced, and the economic benefit of the enterprise is improved.

Description of drawings

Fig. 1 is the structural representation of the recycling processing system of the present invention;

Fig. 2 is the adsorption process flow chart of an embodiment in the recovery processing method of the present invention;

Fig. 3 is the failure processing flow chart of an embodiment in the recycling processing method of the present invention;

Fig. 4 is the recoil processing flow chart of an embodiment in the recovery processing method of the present invention;

Fig. 5 is the analysis processing flow chart of one embodiment in the recycling processing method of the present invention;

Fig. 6 is the regeneration processing flow chart of an embodiment in the recycling processing method of the present invention;

Fig. 7 is the water-washing alkali treatment flow chart of an embodiment in the recovery treatment method of the present invention;

Fig. 8 is an acid cycle flow chart of an embodiment of the recovery and treatment method of the present invention.

Detailed ways

The present invention will be further explained below with reference to specific embodiments, but the present invention is not limited.

In the following examples, unless otherwise specified, the methods used are conventional methods, and the reagents used are all derived from commercial products.

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings of the present invention, and the described embodiments are only a part of the embodiments of the present invention not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

Referring to Figure 1, in the figure 1, 2, 3 are waste water filtrate feed valves, 4, 5, 6 are waste water filtrate discharge valves, 7, 8, 9 are backwash valves, 10, 11, 12 are positive wash valves, 13, 14, and 15 are the alkali inlet valves, 16, 17, and 18 are the analytical liquid outlet valves, 19, 20, and 21 are the top circulating water valves, 22, 23, and 24 are the bottom circulating water valves, and 25, 26, and 27 are the bottom circulating water valves. Bottom acid valve, 28, 29, 30 are top acid valves, 31, 32, 33 are bottom string valves, 34, 35, 36 are top string valves, 37, 38, 39 are string switching valves.

The invention relates to a recovery and treatment system for o-aminophenol in the o-aminophenol acidification wastewater, comprising: an o-aminophenol acidification wastewater pool, which is used for waste water storage and sedimentation;

The waste water filter tank is used to filter the settled waste water to a clear, transparent filtrate without floating oil;

The macroporous adsorption resin analysis treatment device is used to adsorb the o-aminophenol contained in the waste water filtrate. After the adsorption is saturated, the analysis solution is obtained by the hot alkali spray method. The macroporous adsorption resin analysis treatment device consists of a group of large Porous resin adsorption components are composed of macroporous resin adsorption components. The macroporous resin adsorption components include 1#, 2#, and 3# which are separated and independent, all of which are rubber-lined resin columns. Each time they are used, two are used in series. If it is qualified, the previous switch will be invalid immediately, and the other two will be used in series at the same time, and the failed ones will be subjected to circulating water recoil, hot alkali water analysis, analysis liquid collection, and acid circulation treatment in sequence;

Specifically, the external connection pipes and control valves of 1#, 2#, and 3# are the same, that is, the tops of 1#, 2#, and 3# are provided with feed valves, and the bottoms are provided with discharge valves. The feed valves are all connected to the waste water filtrate feed pipeline, the discharge valves are all connected to the water outlet pipeline, and the water outlet pipeline is connected to the sewage collection tank; the top and bottom of 1#, 2#, and 3# are connected in series The three cylinders can form a series pipeline through the series valve, and the series valves can be connected to the series pipeline; the top and bottom of 1#, 2#, 3# are equipped with circulating water valves, and the three cylinders pass through The circulating water valve can form a circulating water pipeline, and the circulating water valves can be connected with the circulating water pipeline; the tops of 1#, 2#, and 3# are equipped with backwash valves, and the bottoms are equipped with positive wash valves. A forward and backwash pipeline can be formed through the forward and backwash valves. Both the forward and backwash valves can be connected to the forward and backwash pipelines, and the forward and backwash pipelines are connected to the original pool on the north side; 1#, 2#, 3# The bottom of the analytic solution is equipped with an analytical solution discharge valve, the analytical solution discharge valve is connected with the analytical solution pipeline, and the analytical solution pipeline is connected with the analytical solution collection tank; the tops of 1#, 2#, and 3# are all provided with alkali inlet valves , the alkali inlet valve can be connected with the alkali circulation pipeline. The alkali circulation pipeline discharges the alkali liquid from the dilute alkali tank on one side, and returns to the dilute alkali tank through the analytical solution pipeline on the other side; the tops of 1#, 2#, and 3# are equipped with inlet Acid valve, with acid circulation valve at the bottom, three cylinders can form an acid circulation pipeline through the acid inlet valve and acid circulation valve, and the acid inlet valve and acid circulation valve can be connected with the acid circulation pipeline;

The analytical solution collection tank is used to collect the decomposed liquid after adsorption and desorption treatment of macroporous resin. connectable;

The sewage discharge tank is used to discharge the wastewater up to the standard or reuse it repeatedly to save water resources. The sewage discharge tank can be connected to 1#, 2#, and 3# respectively through the water outlet pipeline and the discharge valve at the bottom of the three resin columns;

The wastewater in the o-aminophenol acidification wastewater tank is settled and then filtered in the wastewater filter tank. After adjusting the pH value to 5-6, it is heated to ≥30 °C and enters the macroporous adsorption resin analysis and treatment device. After the macroporous adsorption resin analysis and treatment The desorption solution obtained after the adsorption, failure, water backflushing, water washing alkali, and acid cycle treatment in the device enters the desorption solution collection tank, and the treated wastewater that meets the qualified discharge standard enters the sewage discharge tank.

Referring to Fig. 2-Fig. 8, the recovery and treatment method of o-aminophenol in the o-aminophenol acidification waste water carried out based on the recovery and treatment system of the o-aminophenol in the above-mentioned a kind of o-aminophenol acidification waste water, specifically comprises the following steps:

S1 Pre-treatment: After the wastewater is settled and filtered (clear and transparent without floating oil), the pH value is adjusted to 5-6, and adjusted to weak acidity, which can remove the alkaline impurities in the wastewater, and is conducive to large pores in an acidic environment The adsorption resin column can better adsorb the o-aminophenol in the wastewater filtrate;

S2 adsorption treatment: Open the feed valve at the top of the 1# column, the series valve at the bottom of the 1# column, open the series valve at the top of the 2# column, and the discharge valve at the bottom of the 2# column, the second column is in series state, start the waste water pump, adjust The pH value of the wastewater filtrate is 5-6, and the temperature is adjusted to ≥30 °C. The alkaline impurities in the wastewater can be removed under weakly acidic conditions, and the macroporous adsorption resin column can better adsorb the o-aminophenol in the wastewater filtrate in an acidic environment. , the flow rate is 6 cubic meters/h, and the qualified wastewater after series adsorption will enter the sewage discharge tank from the discharge valve at the bottom of the 2# resin column through the water outlet pipeline;

S3 failure treatment: After the effluent at the bottom of the 2# column is unqualified, close the upper feed valve of the 1# column, the bottom series feed valve, close the upper series valve of the 2# column, open the upper feed valve of the 2# column, and close the 2# column. Bottom discharge valve, open 2# bottom series valve, connect 3# upper series valve, open 3# bottom discharge valve, 2# and 3# are in series state;

S4 backflushing treatment: After the failure of the 1# column, open the positive and backwash valve at the top of the 1# column, and at the same time open the circulating water valve at the bottom of the 1# column to backflush the resin, the total water consumption is 5-6 cubic meters, and the water temperature is 50-80 ℃, the flow rate is 12 cubic meters/h, about 10-30 minutes, the effluent enters the northern raw water tank through the upper forward and reverse washing pipeline;

S5 Analytical regeneration treatment: Open the alkali inlet valve at the top of the 1# resin column, and at the same time open the forward and backwash valve at the bottom of the 1# resin column, start the alkali inlet pump, heat to 80 degrees 4% of the total alkali consumption 6 cubic (2BV), the flow rate 3-4.5 cubic meters/H (1-1.5BV), the total time is more than 2 hours, the effluent enters the raw water tank on the north side through the forward and reverse washing pipes, and the effluent is alkaline, that is, when the pH is 10-12, it passes through the bottom of the 1# resin column. The discharge valve enters the analytic liquid collection tank; (the water output is determined by the PH test paper measurement after discharging through the 1# resin column discharge valve, and the discharge valve is used for sampling or overhauling the net material);

S6 water washing alkali treatment: After the hot alkali is finished, close the alkali inlet valve at the top of the 1# column, close the forward and reverse washing valve at the bottom of the 1# resin column, open the circulating water valve at the top of the 1# resin column, and open the bottom of the 1# resin column. Feed valve, the total water consumption for washing is about 6 cubic meters, and the flow rate is 3 cubic meters per H. In the first 1 hour, 3 cubic meters enters the 1# analytical solution collection tank through the analytical solution pipeline, open the feed valve at the top of the dilute alkali tank, and close the 1# analytical solution collection tank. Feed valve, after 1 hour 3 cubic meters enters the dilute alkali tank through the analytical solution pipeline;

S7 acid circulation treatment: open the acid circulation valve at the bottom of the 1# resin column, open the acid inlet valve at the top of the 1# resin column, pump a certain amount of dilute hydrochloric acid into the dilute acid tank, open the dilute acid pump, and drive it into the resin column through the dilute acid pipeline, Cycle for a certain period of time to ensure that the pH in the resin column is about 3, and the cycle ends.

Further, 1#, 2#, and 3# are separate and independent resin columns, and two are used in series each time. Once the water quality behind the series is found to be unqualified, the previous switch will be invalid immediately, and the other two will be used in series at the same time. , and for the failed ones, circulating water backflushing, hot alkali water analysis, analysis liquid collection, and acid circulation treatment are performed in sequence.

Specifically, adjusting the inlet water temperature of the waste water filtrate can be 30°C-80°C, and the temperature ≥ 30°C can prevent o-aminophenol from crystallizing out and blocking the pipeline.

Specifically, the analytical liquid in the analytical liquid collection tank can be directly returned to the production workshop for use, without the need to recycle the finished product, that is, the recycling treatment, which greatly reduces the operating cost, simplifies the recycling and processing equipment, and improves the economic benefits of the enterprise.

Example 2:

The macroporous adsorption resin analysis treatment device is composed of two groups of macroporous resin adsorption components, each group of macroporous resin adsorption components includes three macroporous resin adsorption columns, and the three macroporous resin adsorption columns are connected in series by two adsorption columns The treatment process of adsorption and desorption of another adsorption column; specifically, the macroporous adsorption resin desorption treatment device is composed of 6 macroporous adsorption resin columns, four 1200*3000mm in size and two 1600* 3000mm size, among which, three 1200*3000 resin columns are a set of macroporous resin adsorption components, another 1200*3000 resin column and two 1600*3000 resin columns are another set of macroporous resin adsorption components, the 1200 *The 3000 size resin column is planned to be filled with 3 squares of resin, and the 1600*3000 size resin column is planned to be filled with 4 squares of resin. The macroporous adsorption resin columns are all rubber-lined resin columns.

Example 3

The recovery and treatment method of o-aminophenol in the o-aminophenol acidification wastewater specifically includes the following steps: first, after the content of 15 cubic meters of o-aminophenol in the o-aminophenol sewage of the workshop is settled in a sedimentation tank and filtered in a filter tank, the bottom sludge and floating sludge are removed. Oil stains and other impurities; secondly, the waste water filtrate filtered by the filter tank is adjusted to pH 5-6 and then enters the 1# resin column through the waste water pump through the feed valve, and passes through the 2# resin column in series at the same time, the 1# and 2# resin columns are both 1200*3000 rubber-lined resin columns, each resin column is filled with ADS600 polystyrene resin for 3 liters, and the adsorption efficiency is about 6 liters/hour; secondly, the 1# resin column that has failed in the circulating water backwash step 2, about After 30 minutes, the waste water filtrate remaining in the pores can be removed, and the washing liquid is passed to the north side raw water tank through the front and back washing pipelines at the top; secondly, use 6 cubic meters of 4% sodium hydroxide solution at 80 ℃. The resin column treated in S3 is decomposed to obtain desorption liquid, which is collected into a desorption liquid collection tank, and then pumped back to the workshop for recycling by a pump. The o-aminophenol content in the desorption liquid collection tank liquid is 0.75%, about Pure o-aminophenol 45kg.

After taking three samples and adopting the recovery treatment method of the present invention, COD index and chromaticity index are detected respectively, and the specific data are as follows:

(Table 1)

It can be seen from (Table 1) that the average removal rate of COD in wastewater reaches 99.20%, and the removal rate of chroma is 99.17%;

It can be known from (Table 1) that the average recovery rate per liter of product in the wastewater is as high as 8.19g.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. the recovery processing system of the o-aminophenol in the o-aminophenol acidification waste water, is characterized in that: comprise: o-Aminophenol acidified wastewater tank for wastewater storage and sedimentation; The waste water filter tank is used to filter the settled waste water to a clear, transparent filtrate without floating oil; The macroporous adsorption resin analysis and treatment device is used to absorb the o-aminophenol contained in the wastewater filtrate. After the adsorption is saturated, the analysis solution is obtained by the hot alkali spraying method; Analytical liquid collection tank, used to collect the analytical liquid after adsorption and analytical treatment of macroporous resin; Sewage discharge pool, which is used to discharge wastewater up to the standard or reuse it repeatedly to save water resources; The wastewater in the o-aminophenol acidification wastewater tank enters the wastewater filter tank after sedimentation, and then enters the macroporous adsorption resin analysis and treatment device after adjusting the pH value. , The analytic solution obtained after washing alkali and acid circulation treatment enters into the analytic solution collection tank, and the treated wastewater that meets the qualified discharge standard enters the sewage discharge tank. 2. The recovery and treatment system of o-aminophenol in the o-aminophenol acidification wastewater according to claim 1, is characterized in that: the macroporous adsorption resin analysis and treatment device is composed of at least one group of macroporous resin adsorption components, preferably Two sets of macroporous resin adsorption components, each set of macroporous resin adsorption components includes three macroporous resin adsorption columns, the three macroporous resin adsorption columns use two adsorption columns in series for adsorption, while the other adsorption column is analyzed craft. 3. the recovery processing system of the o-aminophenol in the o-aminophenol acidification wastewater according to claim 2, is characterized in that: the described macroporous adsorption resin analysis and treatment device is made up of 6 macroporous adsorption resin columns, which are respectively four. One 1200*3000mm size and two 1600*3000mm size, of which three 1200*3000 resin columns are a set of macroporous resin adsorption components, another 1200*3000 resin column and two 1600*3000 resin columns are another A set of macroporous resin adsorption components. 4. the recovery treatment system of the o-aminophenol in the o-aminophenol acidification waste water according to claim 3, it is characterized in that: the resin column of described 1200*3000 size is planned to pack 3 square resins, the resin column of 1600*3000 size Filled with 4 square resin. 5. The recovery and treatment system of o-aminophenol in the o-aminophenol acidification wastewater according to claim 2, 3 or 4, wherein the macroporous adsorption resin column is a rubber-lined resin column. 6. the recovery treatment method of the recovery treatment system of the o-aminophenol in the o-aminophenol acidification waste water according to claim 1, is characterized in that, specifically comprises the following steps: S1 Pre-treatment: After the wastewater is settled and filtered (clear and transparent without floating oil), the pH value is adjusted to 5-6, and adjusted to weak acidity, which can remove the alkaline impurities in the wastewater, and is conducive to large pores in an acidic environment The adsorption resin column can better adsorb the o-aminophenol in the wastewater filtrate; S2 adsorption treatment: adjust the inlet water temperature of the wastewater filtrate to ≥30°C to prevent the crystallization of o-aminophenol from clogging the pipeline. The wastewater filtrate enters a set of macroporous adsorption resin adsorption components through the wastewater pump and the feed pipeline. The components include 1#, 2 #, 3# resin column, the wastewater filtrate first enters the resin column connected in series with 1# and 2# for adsorption, and the adsorbed wastewater filtrate is directly discharged into the sewage discharge tank when the effluent at the bottom of 2# is qualified; S3 failure treatment: when the effluent at the bottom of the 2# resin column is unqualified, the 1# resin column connected in series with it has failed. At this time, the waste water filtrate is stopped from entering the 1# resin column, and the series connection of 1# and 2# is disconnected. Start the series connection of 2# and 3#, that is, the waste water filtrate enters the resin column of 2# and 3# through the waste water pump and the feed pipeline for adsorption; S4 backflushing treatment: The 1# resin column that has failed is subjected to forward and reverse water flushing through the circulating water pump and the circulating water pipeline, so as to remove the residual waste water filtrate in the 1# resin channel, and the effluent is discharged into the original pool through the forward and reverse washing pipeline; S5 Analytical regeneration treatment: Pass the hot alkali liquid in the dilute alkali tank heated to 80 °C into the 1# resin column after backflushing through the alkali feed pump and the alkali feed pipeline. When the water at the bottom of the 1# resin column is alkaline At the same time, the desorption liquid is sent to the desorption liquid collection tank through the desorption liquid pipeline at the bottom of the 1# resin column; S6 water washing alkali treatment: after the hot lye in step S5 is finished, stop the hot lye from entering the 1# resin column, and open the circulating water pipeline of the 1# resin column for washing, and a part of the washing lye enters the analysis through the analysis solution pipeline. In the liquid collection tank, another part of the washing alkali liquid enters the dilute alkali tank through the analytical liquid pipeline for recycling; S7 acid circulation treatment: a certain amount of dilute hydrochloric acid is injected into the 1# resin column treated by S6 through the dilute acid pump and the dilute acid pipeline, and circulates for a certain period of time. When the pH in the resin column is about 3, the cycle ends. 7. The method for reclaiming o-aminophenol in the acidification wastewater of o-aminophenol according to claim 6, characterized in that: the inflow temperature of the regulating wastewater filtrate described in S2 is 30 ℃-80 ℃. 8. the recovery treatment method of the o-aminophenol in the o-aminophenol acidification waste water according to claim 6, is characterized in that: 1#, 2#, 3# are separate independent resin columns, and each use is two series connection If it is found that the water quality behind the series is unqualified, the previous switch will be disabled immediately, and the other two will be used in series at the same time, and the failed ones will be subjected to circulating water backflushing, hot alkaline water analysis, analysis liquid collection, and acid circulation treatment. 9. the recovery treatment method of the o-aminophenol in the o-aminophenol acidification waste water according to claim 6, is characterized in that, the analysis liquid in the analysis liquid collection tank described in S5 can be directly returned to the production workshop for use, that is, the recycling is applied deal with. 10. the recovery processing method of the o-aminophenol in the o-aminophenol acidification wastewater according to claim 6, is characterized in that, the effluent partial alkalinity described in S5 refers to when pH value is 10-12, specifically , and its water effluent is determined by sampling the bottom of the 1# resin column for PH test paper measurement.

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