Pharmaceutical wastewater treatment device

Abstract

The utility model belongs to the technical field of wastewater treatment, and particularly relates to a pharmaceutical wastewater treatment device. Comprising an MVR concentrator, a centrifugal machine, a mixing tank, a plate frame type filter and a thickener which are sequentially connected, a top clear liquid outlet of the thickener is connected with an inlet of a clear liquid tank, an outlet of the clear liquid tank is connected with a top inlet of a mother liquid tank, and a bottom outlet of the thickener and a bottom outlet of the mother liquid tank are connected with an inlet of a reflux pump through pipelines. An outlet of the reflux pump is connected with an inlet of the plate frame type filter through a pipeline; and a middle clear liquid outlet of the mother liquid tank is connected with an inlet of a preheater of the CWO system. Through application of a three-step glue removing technology, the problem that glue is not thoroughly removed in a traditional treatment process is effectively solved, the operation efficiency and the overall treatment effect of the CWO system are remarkably improved, and the method is efficient and environmentally friendly.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment, and in particular relates to a pharmaceutical wastewater treatment device. Background Art

[0002] In the pharmaceutical industry, wastewater treatment is a vital link. Traditional pharmaceutical wastewater treatment processes often face problems such as complex wastewater composition, high organic content, and difficulty in effectively removing colloids and suspended solids. In particular, the mother liquor after MVR (mechanical vapor recompression) concentration, its high concentration and high viscosity characteristics make subsequent treatment more difficult.

[0003] In the prior art, although there are wastewater treatment devices that use MVR concentration combined with centrifugation, filtration, sedimentation and other steps, these devices often have problems such as incomplete colloid removal, poor system stability, and low treatment efficiency during the treatment process. In particular, if the colloid in the mother liquor after the saponification reaction is not completely removed, it will directly affect the operating efficiency and treatment effect of the subsequent CWO (catalytic wet oxidation) system, increase operating costs, and may even cause secondary pollution to the environment. Utility Model Content

[0004] In view of the above deficiencies in the prior art, the purpose of the utility model is to provide a pharmaceutical wastewater treatment device. Through the application of three-step de-colloiding technology, the problem of incomplete colloid removal in the traditional treatment process is effectively solved, and the operating efficiency and overall treatment effect of the CWO system are significantly improved, which is efficient and environmentally friendly.

[0005] The utility model is realized by adopting the following technical solutions:

[0006] The pharmaceutical wastewater treatment device comprises an MVR concentrator, a centrifuge, a mixing tank, a plate-frame filter and a thickener connected in sequence. The mother liquor concentrated by MVR is sent to the centrifuge for centrifugal treatment, and the secondary mother liquor obtained after centrifugation is sent to the mixing tank for saponification treatment. After the saponification reaction is completed, it enters the plate-frame filter for preliminary filtration, and the filtered mother liquor is sent to the thickener for sedimentation separation.

[0007] The top clear liquid outlet of the thickener is connected to the inlet of the clear liquid tank, and the outlet of the clear liquid tank is connected to the top inlet of the mother liquid tank, so that the clear liquid enters the mother liquid tank for further sedimentation separation; the bottom outlet of the thickener and the bottom outlet of the mother liquid tank are connected to the inlet of the reflux pump through a pipeline, and the outlet of the reflux pump is connected to the inlet of the plate and frame filter through a pipeline for circulation filtration, and the middle clear liquid outlet of the mother liquid tank is connected to the inlet of the preheater of the CWO system. The clear liquid after sedimentation and separation again enters the CWO system for catalytic wet oxidation treatment.

[0008] A reciprocating pump is provided on the pipeline between the middle clear liquid outlet of the mother liquid tank and the inlet of the preheater of the CWO system.

[0009] The mixing tank is connected to the pH regulator storage tank and the stripping residual liquid storage tank through pipelines. The pH value is adjusted and the saponification reaction is carried out by adding the pH regulator or the stripping residual liquid.

[0010] A pH monitoring device is provided in the mixing tank.

[0011] The CWO system comprises a preheater, a reactor and a separator which are connected in sequence.

[0012] The bottom outlet of the separator is connected to the inlet of the mother liquid tank through a reflux pipeline. A reflux valve is provided on the reflux pipeline to reflux the incompletely reacted mother liquid in the separator to the mother liquid tank for another reaction.

[0013] The bottom outlet pipe of the separator is provided with a sampling port for sampling and detecting the residue content in the material flowing out from the bottom of the separator. If the content is higher than the set value, it means that the material still contains a lot of unreacted or incompletely separated components, and needs to be refluxed to the mother liquid tank to participate in the reaction again.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] (1) The pharmaceutical wastewater treatment device of the reactor described in the utility model adopts a three-step degumming technology, that is, after saponification, it is first filtered through a plate and frame filter (one-step degumming), then enters a thickener for sedimentation separation (two-step degumming), and finally enters a mother liquor tank for sedimentation separation again (three-step degumming). This multi-stage degumming method effectively removes colloids and suspended matter in the mother liquor, making the mother liquor that finally enters the CWO system cleaner, significantly improving the water quality of the inlet water for subsequent treatment;

[0016] (2) The pharmaceutical wastewater treatment device described in the utility model, through three-step de-gum treatment, makes the colloid content of the mother liquor entering the CWO system extremely low, thereby reducing the consumption of catalysts and the risk of clogging in the CWO system, and improving the efficiency and stability of the catalytic wet oxidation reaction. This not only reduces the operating cost, but also extends the maintenance cycle of the CWO system, and enhances the reliability and economy of the overall system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the pharmaceutical wastewater treatment device described in the utility model;

[0018] In the figure: 1. MVR concentrator; 2. centrifuge; 3. mixing tank; 4. plate and frame filter; 5. thickener; 6. mother liquor tank; 7. reflux pump; 8. preheater; 9. pH adjuster storage tank; 10. stripping residual liquid storage tank; 11. pH monitoring device; 12. reactor; 13. separator; 14. reflux pipeline; 15. reflux valve; 16. sampling port; 17. clear liquid tank; 18. reciprocating pump. DETAILED DESCRIPTION

[0019] In order to make the purpose and technical solution of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings.

[0020] Example 1

[0021] like Figure 1 As shown, the pharmaceutical wastewater treatment device includes an MVR concentrator 1, a centrifuge 2, a mixing tank 3, a plate and frame filter 4 and a thickener 5 connected in sequence, the top clear liquid outlet of the thickener 5 is connected to the inlet of the clear liquid tank 17, the outlet of the clear liquid tank 17 is connected to the top inlet of the mother liquid tank 6, the bottom outlet of the thickener 5 and the bottom outlet of the mother liquid tank 6 are connected to the inlet of the reflux pump 7 through a pipeline, the outlet of the reflux pump 7 is connected to the inlet of the plate and frame filter 4 through a pipeline, and the middle clear liquid outlet of the mother liquid tank 6 is connected to the inlet of the preheater 8 of the CWO system.

[0022] The mixing tank 3 is connected to the pH regulator storage tank 9 and the stripping residual liquid storage tank 10 through pipelines.

[0023] The mixing tank 3 is provided with a pH monitoring device 11 .

[0024] The CWO system comprises a preheater 8, a reactor 12 and a separator 13 which are connected in sequence.

[0025] The bottom outlet of the separator 13 is connected to the inlet of the mother liquid tank 6 through a reflux pipeline 14 , and a reflux valve 15 is provided on the reflux pipeline 14 .

[0026] A sampling port 16 is provided on the bottom outlet pipeline of the separator 13 .

[0027] A reciprocating pump 18 is provided on the pipeline between the middle clear liquid outlet of the mother liquid tank 6 and the inlet of the preheater 8 of the CWO system.

[0028] When working, the specific steps are as follows:

[0029] 1. Initial processing stage

[0030] First, pharmaceutical wastewater enters MVR concentrator 1 through a pipeline. In MVR concentrator 1, the wastewater is evaporated by heating, and most of the water is removed in the form of steam. The concentrated mother liquor is used as the treatment object in the next stage. This process effectively reduces the volume of wastewater and facilitates subsequent treatment.

[0031] Subsequently, the mother liquor after MVR concentration is sent to centrifuge 2 for centrifugal treatment. During the centrifugation process, the solid particles and heavier impurities in the mother liquor are separated to form a relatively clear secondary mother liquor (neutral), i.e., centrifuge liquid. The centrifuge liquid is then sent to the next treatment unit.

[0032] 2. Saponification stage

[0033] After the secondary mother liquor enters the mixing tank 3, according to the process requirements, an appropriate amount of pH regulator and stripping residual liquid are added to the mixing tank 3 through a pipeline to adjust the pH value of the mother liquor to 12, and a saponification reaction is performed. The saponification reaction is intended to remove colloidal substances in the mother liquor and improve the efficiency and effect of subsequent treatment. A pH monitoring device 11 is provided in the mixing tank 3 to monitor the pH value changes during the reaction in real time to ensure stable reaction conditions.

[0034] 3. Preliminary Filtration and Sedimentation Separation

[0035] After the saponification reaction is completed, the mixed liquid (ie, the saponified liquid) enters the plate and frame filter 4 for preliminary filtration to remove most of the colloids and other suspended matter.

[0036] The mother liquor after preliminary filtration is sent to the thickener 5 for sedimentation separation. In the thickener 5, the colloid, microparticles and some dissolved substances in the mother liquor gradually settle to the bottom under the action of gravity, forming a relatively clear top clear liquid. The top clear liquid is transported to the clear liquid tank 17 through a pipeline, and then transported to the mother liquid tank 6, and enters the mother liquid tank 6 from the top inlet for further sedimentation separation.

[0037] 4. Deep processing and recycling

[0038] After the top clear liquid enters the mother liquid tank 6, it is subjected to sedimentation separation for a longer period of time in the tank. A clear liquid outlet is provided in the middle of the mother liquid tank 6, which is connected to the preheater 8 of the CWO system. Under the action of the reciprocating pump 18, the clear liquid after sedimentation separation again enters the CWO system from the mother liquid tank 6 for catalytic wet oxidation treatment to completely degrade the organic matter and residual colloids in the wastewater.

[0039] The clear liquid is first heated to a suitable reaction temperature by a preheater 8 in the CWO system, and then enters the reactor 12 for catalytic wet oxidation reaction. During the reaction, organic matter is efficiently oxidized and decomposed to generate harmless or low-toxic substances. The mixture after the reaction enters the separator 13 for solid-liquid separation. The separated clear liquid can be directly discharged or reused. When it is detected that the content of the residue in the material flowing out from the bottom of the separator 13 is higher than the set value, it is returned to the mother liquid tank 6 through the reflux pipeline 14 for further treatment until the discharge standard is met.

[0040] 5. Circulation filtration and waste residue treatment

[0041] The mother liquor (containing a large amount of colloid) at the bottom of the thickener 5 and the bottom of the mother liquor tank 6 is regularly pumped into the plate and frame filter 4 through the reflux pump 7 for circulation filtration to further remove the colloid and other impurities.

Claims

1. A pharmaceutical wastewater treatment device, characterized in that: The invention comprises an MVR concentrator (1), a centrifuge (2), a mixing tank (3), a plate-frame filter (4) and a thickener (5) which are connected in sequence. The top clear liquid outlet of the thickener (5) is connected to the inlet of a clear liquid tank (17), the outlet of the clear liquid tank (17) is connected to the top inlet of a mother liquid tank (6), the bottom outlet of the thickener (5) and the bottom outlet of the mother liquid tank (6) are connected to the inlet of a reflux pump (7) through a pipeline, the outlet of the reflux pump (7) is connected to the inlet of the plate-frame filter (4) through a pipeline, and the middle clear liquid outlet of the mother liquid tank (6) is connected to the inlet of a preheater (8) of a CWO system.

2. The pharmaceutical wastewater treatment device according to claim 1, characterized in that: The mixing tank (3) is connected to the pH regulator storage tank (9) and the stripping residual liquid storage tank (10) through pipelines.

3. The pharmaceutical wastewater treatment device according to claim 2, characterized in that: The mixing tank (3) is provided with a pH monitoring device (11).

4. The pharmaceutical wastewater treatment device according to claim 1, characterized in that: The CWO system comprises a preheater (8), a reactor (12) and a separator (13) which are connected in sequence.

5. The pharmaceutical wastewater treatment device according to claim 4, characterized in that: The bottom outlet of the separator (13) is connected to the inlet of the mother liquid tank (6) through a reflux pipeline (14), and a reflux valve (15) is provided on the reflux pipeline (14).

6. The pharmaceutical wastewater treatment device according to claim 5, characterized in that: A sampling port (16) is provided on the bottom outlet pipeline of the separator (13).

7. The pharmaceutical wastewater treatment device according to claim 6, characterized in that: A reciprocating pump (18) is provided on the pipeline between the middle clear liquid outlet of the mother liquid tank (6) and the inlet of the preheater (8) of the CWO system.

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