CN212174734U - A pharmaceutical wastewater treatment system for chemical synthesis of refractory pollutants - Google Patents

Abstract

The utility model discloses a chemical synthesis pharmaceutical wastewater treatment system for refractory pollutants, which comprises a pretreatment system, a physicochemical treatment system, a biological treatment system and a sludge treatment system, wherein wastewater enters a regulating tank after passing through a grid, is lifted to a filtering system by a pump for further purification, and is discharged after reaching the standard; and residual sludge generated by the catalytic oxidation reactor, the ABR anaerobic reaction tank, the secondary sedimentation tank and the coagulation reaction sedimentation tank enters a sludge concentration tank, and supernatant of the sludge concentration tank flows back to the regulating tank. The utility model discloses it is economical feasible, be one kind and be used for handling difficult degradation pollutant chemical synthesis class pharmacy waste water system specially, overcome the bottleneck that current chemical synthesis class pharmacy waste water meets with, guaranteed the steady operation of operating system and go out the stable up to standard of water quality, also reduced the pollution to receiving the water simultaneously, improved water environmental quality.

Description

A pharmaceutical wastewater treatment system for chemical synthesis of refractory pollutants

technical field

The utility model belongs to the field of wastewater treatment, and relates to a pharmaceutical wastewater treatment system for chemical synthesis of refractory pollutants, in particular to a pharmaceutical wastewater treatment system specially designed for "high pollutant concentration, poor biodegradability, high biological toxicity, and difficult pollutant treatment". chemical synthesis pharmaceutical wastewater treatment system.

technical background

With people's attention to life and health, the pharmaceutical industry has developed rapidly, especially the chemical synthesis pharmaceutical industry. Production wastewater is a serious threat to the water environment on which human survival depends. Chemical synthesis pharmaceutical wastewater has complex pollutant components, large changes in water quality and water quality, and unstable water quality. "High pollutant concentration, poor biodegradability, high biological toxicity, and difficult to treat pollutants" are prominent problems in chemical synthesis pharmaceutical wastewater, which makes the effective treatment of chemical synthesis pharmaceutical wastewater a big bottleneck.

The existing chemical synthesis pharmaceutical wastewater treatment system still has the drawbacks that the equipment cannot operate stably and the effluent quality cannot stably reach the standard, especially for a chemical synthesis pharmaceutical wastewater treatment system for refractory pollutants. At present, there is no special treatment system for chemically synthesized pharmaceutical wastewater of refractory pollutants, so as to ensure the long-term stable operation of the wastewater treatment system equipment and the stable effluent quality.

SUMMARY OF THE INVENTION

In order to overcome the above-mentioned deficiencies in the prior art, the utility model provides a practical and feasible system specially used for the treatment of refractory pollutants chemical synthesis pharmaceutical waste water. Oxygen + aerobic + secondary sedimentation tank + coagulation sedimentation + activated carbon filtration" combined process to treat sewage to ensure that chemical synthesis pharmaceutical wastewater effluent quality can reach the standard stably, reduce the pollution of wastewater to receiving water bodies, and effectively improve the water environment quality .

The purpose of this utility model is achieved in this way:

A system for treating refractory pollutants chemical synthesis pharmaceutical wastewater, characterized in that: a grid 2 is arranged in a grid canal 1, and the wastewater enters a regulating tank 3 after passing through the grid 2, and is lifted by a lifting pump 4 in the regulating tank to Catalytic oxidation reactor 6, then enter into ABR anaerobic reaction tank 7, carry out anaerobic biodegradation treatment, effluent enters aerobic tank 10, effluent from aerobic tank 10 enters secondary sedimentation tank 14 for mud-water separation, and secondary sedimentation tank 14 effluent flows into In the coagulation reaction sedimentation tank 18, the pollutants are further flocculated, precipitated and separated, and the effluent from the coagulation reaction sedimentation tank 18 enters the intermediate water tank 20 for storage, and is lifted to the filtration system by the filtration lift pump 23 for further purification, and then discharged up to the standard.

The grille 2 is connected to the adjustment tank 3, and the grille 2 is used to intercept large-sized floating objects and suspended solids in the sewage; the adjustment tank 3 is used to adjust the water quality and quantity, and an aerobic tank aeration plate 11 is also installed. Microaeration.

The catalytic oxidation reactor 6 includes stages such as catalysis, coagulation, and precipitation. In the H ₂ O ₂ (hydrogen peroxide) dosing pool 29 and the FeSO ₄ (ferrous sulfate) dosing pool 32, H ₂ O ₂ dosing The chemical pipeline 31 and the FeSO ₄ dosing pipeline 34 are added with Fenton reagent (including hydrogen peroxide and ferrous sulfate) to carry out catalytic oxidation reaction. The stirring method is air stirring. The oxygen radical reacts to form ferric hydroxide colloidal precipitation, and coagulates with the polyacrylamide (PAM) added through the PAM dosing pipeline 43 to form alum that is easy to precipitate. The stirring method is mechanical stirring. The formed sediment is precipitated in the sedimentation tank, the generated sludge enters the sludge thickening tank 25 , and the supernatant flows into the ABR anaerobic reaction tank 7 by itself.

The ABR anaerobic reaction tank 7 is provided with an elastic three-dimensional packing 8, which is connected to the internal return pump 9 for anaerobic biodegradation treatment.

The aerobic tank aeration plate 11 is arranged in the aerobic tank 10, and the generated oxygen fills the tank through the aeration pipeline 12 of the aerobic tank. The microorganisms attached to the aerobic tank filler 13 decompose and digest the pollutants in the water, and the organic Degraded into water and carbon dioxide, the pollutants are mostly removed, and the water quality is purified.

The secondary sedimentation tank 14 is provided with a sludge discharge pump 16, and most of the sludge that has been deposited and concentrated is returned to the aerobic tank 10 as inoculated sludge. Activated sludge and other solid matter settle here and are separated from the water.

The coagulation reaction sedimentation tank 18, the reaction zone and the sedimentation zone are respectively provided with a stirrer 17 and inclined tube filler 19, and PAC/PAM coagulant and The coagulant aid makes the particles that are difficult to settle in the water polymerize with each other to form a colloid, and then combine with the impurities in the water to form a larger floc.

The water inlet and outlet of the intermediate pool 20 are respectively provided with a water inlet pipe 21 and an overflow pipe 22, and a filter lifting pump 23 is connected behind.

The activated carbon filter 24 should be backwashed after running for a period of time. The backwash water uses the water in the intermediate pool 20 , and the backwash effluent enters the adjustment pool 3 .

The sludge thickening tank 25 is provided with a sludge discharge pipeline 26, followed by a sludge screw pump 27 to transport the sludge to the sludge filter press 28, and the dewatered sludge is transported to the outside for processing, and the filter press effluent enters the adjustment tank 3.

Among them, the excess sludge produced by the catalytic oxidation reactor 6, the ABR anaerobic reaction tank 7, the secondary sedimentation tank 14, and the coagulation reaction sedimentation tank 18 enters the sludge thickening tank 25, and the supernatant of the sludge thickening tank 25 is returned to adjust In tank 3, the sludge in the sludge tank is filtered and dehydrated by the sludge filter press 28 and then transported out for disposal, and the press filtrate is returned to the adjustment tank 3.

Positive and beneficial effects: the utility model is an economical and feasible system specially used for the treatment of refractory pollutants chemical synthesis pharmaceutical waste water, overcomes the bottleneck problem encountered in the existing effective treatment of chemical synthesis pharmaceutical waste water, and reduces the amount of water consumption. pollution of the environment.

Description of drawings

1 is a schematic diagram of the system structure of the present utility model

In the figure: grid canal 1, grid 2, regulating tank 3, regulating tank lift pump 4, regulating tank micro-aeration device 5, catalytic oxidation reactor 6, ABR anaerobic reaction tank 7, elastic three-dimensional packing 8, internal reflux Pump 9, Aerobic tank 10, Aerobic tank aeration plate 11, Aerobic tank aeration pipeline 12, Aerobic tank packing 13, Secondary sedimentation tank 14, Secondary sedimentation tank inclined tube packing 15, Sludge pump 16, agitator 17. Coagulation reaction sedimentation tank 18, inclined tube packing 19, intermediate water tank 20, water inlet pipeline 21, overflow pipeline 22, filter lift pump 23, activated carbon filter 24, sludge concentration tank 25, sludge discharge pipeline 26, sewage Mud screw pump 27, sludge filter press 28, H ₂ O ₂ dosing tank 29, H ₂ O ₂ dosing pump 30, H ₂ O ₂ dosing pipeline 31, FeSO ₄ dosing pool 32, FeSO ₄ dosing Pump 33, FeSO ₄ dosing pipeline 34, NaOH dosing pool 35, NaOH dosing pump 36, NaOH dosing pipeline 37, PAC dosing pool 38, PAC dosing pump 39, PAC dosing pipeline 40, PAM dosing pool 41. PAM dosing pump 42, PAM dosing pipeline 43, and mud pump 44.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Figure 1, a system for treating refractory pollutants chemical synthesis pharmaceutical wastewater, is characterized in that: comprising a grid canal 1 and its connected adjustment tank 3, the grid canal 1 is provided with a grid 2. The wastewater is lifted to the catalytic oxidation reactor 6 by the regulating tank lift pump 4, and then enters the ABR anaerobic reaction tank 7 for anaerobic biodegradation treatment, the effluent enters the aerobic tank 10, and the aerobic tank effluent enters the secondary sedimentation tank 14. The mud and water are separated, the effluent of the secondary sedimentation tank 14 naturally flows into the coagulation reaction sedimentation tank 18, and the pollutants are further flocculated and precipitated. Discharge.

The pharmaceutical wastewater enters into the grid canal 1, and the grid 2 is used to intercept the larger floating objects and suspended solids in the sewage; the regulating tank 3 is connected with the grid canal 1 to adjust the water quality and quantity, and an aerobic tank aeration plate is also installed. 11. Regular micro-aeration.

The waste water enters the catalytic oxidation reactor 6 in turn, and in the H ₂ O ₂ dosing pool 29 and the FeSO ₄ dosing pool 32, respectively, through the H ₂ O ₂ dosing pipeline 31 and the FeSO ₄ dosing pipeline 34, adding Fenton reagent to carry out Catalytic oxidation reaction, the stirring mode is air stirring, and the iron ions generated by catalytic oxidation react with the hydroxides provided by the NaOH dosing pipeline 37 to generate ferric hydroxide colloidal precipitation, which is added through the PAM dosing pipeline 43. PAM undergoes a coagulation reaction to form flocculent flowers that are easy to precipitate. The stirring method is mechanical stirring. The precipitate formed by the coagulation reaction is precipitated in the sedimentation tank, the generated sludge enters the sludge thickening tank 25, and the supernatant flows into the ABR by itself. Anaerobic reaction tank 7.

An elastic three-dimensional packing 8 is arranged in the ABR anaerobic reaction tank 7, which is connected with the internal return pump 9 to perform anaerobic biodegradation treatment on the wastewater.

The aerobic tank aeration plate 11 is arranged in the aerobic tank 10, and the generated oxygen fills the tank through the aeration pipeline 12 of the aerobic tank. The microorganisms attached to the aerobic tank filler 13 decompose and digest the pollutants in the water, and degrade the organic matter into water. And carbon dioxide, the pollutants are mostly removed, and the water quality is purified.

The secondary sedimentation tank 14 is provided with a sludge discharge pump 16, and most of the sludge that has been deposited and concentrated is returned to the aerobic tank 10 as inoculated sludge. Mud and other solids are separated from water.

The agitator 17 and the inclined tube packing 19 are respectively set in the reaction zone and the sedimentation zone of the coagulation reaction sedimentation tank 18. In the PAC dosing tank 38 and the PAM dosing tank 41, the PAC dosing pipeline 40 and the PAM dosing pipeline 43 are respectively provided. Add PAC/PAM coagulant and coagulant to the wastewater, so that the particles that are difficult to settle in the water can polymerize with each other to form a colloid, and then combine with the impurities in the water to form a larger floc.

The water inlet and outlet of the intermediate pool 20 are respectively provided with a water inlet pipe 21 and an overflow pipe 22, and a filter lifting pump 23 is connected behind.

The activated carbon filter 24 should be backwashed after running for a period of time. The backwashing water uses the water in the intermediate pool 20 , and the backwashing effluent enters the regulating pool 3 .

The sludge thickening tank 25 is provided with a sludge discharge pipeline 26, followed by a sludge screw pump 27 to transport the sludge to the sludge filter press 28, and the dewatered sludge is transported to the outside for processing.

Among them, the excess sludge produced by the catalytic oxidation reactor 6, the ABR anaerobic reaction tank 7, the secondary sedimentation tank 14, and the coagulation reaction sedimentation tank 18 enters the sludge thickening tank 25, and the supernatant of the sludge thickening tank 25 is returned to adjust In tank 3, the sludge in the sludge tank is filtered and dehydrated by the sludge filter press 28 and then transported out for disposal, and the press filtrate is returned to the adjustment tank 3.

Example 1

The wastewater volume of a chemical synthesis pharmaceutical company's sewage treatment station in Henan is 100m ³ /d, and the influent water quality is COD 5500mg/L, BOD ₅ 1300mg/L, SS150mg/L, NH ₃ -N15mg/L, TN 20mg/L, chroma 20 times , TP1mg/L, dichloromethane 60mg/L, total organic carbon 1100mg/L.

One grille canal is set up, and the artificial grille 2 is installed obliquely in the water inlet channel to intercept larger suspended solids and impurities in the sewage and ensure the normal operation of subsequent treatment structures or equipment.

The effective volume of the adjustment tank 3 is 103m ³ , and the front end is connected with the grille canal 1. It is equipped with two sewage lifting pumps 4 (one for use and one for standby) and a set of adjustment tank micro-aeration device 5. The adjustment tank is micro-aerated by a blower The device 5 performs air aeration and stirring, so that the mud and water are mixed evenly, and the sludge deposition is effectively prevented.

Catalytic oxidation reactor 6 has a hydraulic retention time of 4.5h, including stages of catalysis, coagulation, and precipitation. In the H ₂ O ₂ dosing tank 29 and the FeSO ₄ dosing tank 32, through the H ₂ O ₂ dosing pipeline 31 and the FeSO ₄ dosing pipeline 34, Fenton reagent is added to carry out catalytic oxidation reaction to remove COD and improve the efficiency of wastewater. Biochemical, stirring method is air stirring. The iron ion produced by catalytic oxidation reacts with the hydroxide provided by the NaOH dosing pipeline 37 to generate ferric hydroxide colloidal precipitation, and coagulates with the PAM added in the PAM dosing pipeline 43 to form alum that is easy to precipitate, The stirring method is mechanical stirring. The sediment formed by the coagulation reaction is precipitated in the sedimentation tank, the generated sludge enters the sludge thickening tank 25 , and the supernatant flows into the ABR anaerobic reaction tank 7 by itself.

The ABR anaerobic reaction tank 7 has an effective volume of 105m ³ and a residence time of 25h. Two internal return pumps 9 (one for use and one for standby) are installed, and the elastic three-dimensional packing 8 has a volume of 70m ³ , which is connected to the internal return pump 9 for anaerobic biodegradation treatment. .

The aerobic tank 10 has an effective volume of 105m ³ and a hydraulic retention time of 25h. An aerobic tank aeration plate 11 is installed, and the generated oxygen fills the tank through the aeration pipeline 12 of the aerobic tank. The microorganisms attached to the aerobic tank filler 13 pollute the water. The material is decomposed and digested, the organic matter is degraded into water and carbon dioxide, the pollutants are mostly removed, and the water quality is purified.

Two sludge discharge pumps 16 (one for use and one for standby) are arranged in the secondary sedimentation tank 14 , and most of the sludge that has undergone sedimentation and concentration is returned to the aerobic tank 10 as inoculated sludge. The muddy water flowing in through the water inlet pipe of the secondary sedimentation tank, under the action of the inclined pipe filler 15 of the secondary sedimentation tank, precipitates the activated sludge and other solid substances suspended in the mixed liquid here and separates it from the water.

In the coagulation reaction sedimentation tank 18, the reaction zone and the sedimentation zone are respectively provided with two agitators 17 and inclined tube fillers 19. In the PAC dosing tank 38 and the PAM dosing tank 41, the PAC dosing pipeline 40 and the PAM dosing tank 41 are used for dosing. Pipe 43 adds PAC/PAM coagulant and coagulant to the water, so that the particles that are difficult to settle in the water can polymerize with each other to form a colloid, and then combine with the impurities in the water to form a larger floc.

The water inlet and outlet of the intermediate pool 20 are respectively provided with a water inlet pipe 21 and an overflow pipe 22, and two filter lifting pumps 23 (1 use and 1 backup) are connected behind.

The activated carbon filter 24 should be backwashed after running for a period of time (the filter lift pump 23 doubles as a backwash pump). Provided, the backwash effluent enters the regulating tank 3 to ensure that the dichloromethane meets the standard.

The sludge thickening tank 25 is provided with a sludge discharge pipeline 26, followed by a sludge screw pump 27 to transport the sludge to a sludge filter press 28, and the dewatered sludge is transported to the outside for processing, and the effluent from the filter press enters Conditioning Pool 3.

The excess sludge produced by the catalytic oxidation reactor 6 , the ABR anaerobic reaction tank 7 , the secondary sedimentation tank 14 , and the coagulation reaction sedimentation tank 18 enters the sludge thickening tank 25 . The supernatant of the sludge thickening tank 25 is returned to the adjustment tank 3 , the sludge in the sludge tank is dewatered by the sludge filter press 28 and then transported for disposal, and the press filtrate is returned to the adjustment tank 3 .

The effluent quality after the above-mentioned sewage treatment system meets the requirements of Standard B in Table 1 of the Standard for Indirect Discharge of Water Pollutants for Chemical Synthesis and Pharmaceutical Industry (DB41/756-2012), specifically: COD≤220mg/L, _BOD5≤40mg / L, SS≤50mg/L, NH ₃ -N≤35mg/L, TN≤50mg/L, chromaticity≤50 times, dichloromethane≤0.3mg/L, total organic carbon≤50mg/L.

The above wastewater treatment system is not only suitable for the chemical synthesis pharmaceutical wastewater treatment system of refractory pollutants, but also for other traditional Chinese medicine extraction industry wastewater with similar characteristics.

The above examples are only used to illustrate the preferred embodiments of the present utility model, but the present utility model is not limited to the above-mentioned embodiments. Any modifications, equivalent substitutions and improvements, etc., shall be covered within the scope of the technical solutions claimed in the present invention.

Claims (9)

1. The utility model provides a refractory pollutant chemical synthesis class pharmacy effluent disposal system which characterized in that: set up grid (2) in grid ditch (1), waste water gets into equalizing basin (3) behind grid (2), promote to catalytic oxidation reactor (6) through equalizing basin elevator pump (4), then get into ABR anaerobic reaction pond (7), carry out anaerobic biodegradation and handle, it gets into good oxygen pond (10) to go out water, good oxygen pond (10) are gone out water and are got into two heavy ponds (14) and carry out mud-water separation, two heavy ponds (14) are gone out water gravity flow and are got into coagulation reaction sedimentation tank (18), the further flocculation and precipitation separation of pollutant, coagulation reaction sedimentation tank (18) are gone out water and are got into middle pond (20) and store, promote to filtration system further after purifying through straining elevator pump (23), discharge to reach standard.

2. The system for treating pharmaceutical wastewater generated by chemical synthesis of refractory pollutants according to claim 1, wherein the system comprises: the grating (2) is connected with the adjusting tank (3), and the grating (2) is used for intercepting large-size floaters and suspended matters in the sewage to ensure the normal operation of sewage treatment facilities; the water quality and the water quantity are adjusted in the adjusting tank (3) to ensure that the subsequent working section can uniformly feed water, and in addition, an adjusting tank micro-aeration device (5) is arranged in the adjusting tank (3) to perform timed micro-aeration and play roles in pre-aeration and stirring.

3. The system for treating pharmaceutical wastewater generated by chemical synthesis of refractory pollutants according to claim 1, wherein the system comprises: the catalytic oxidation reactor (6) comprises a catalysis stage, a coagulation stage and a precipitation stage in H₂O₂A dosing pool (29) and FeSO₄In the medicine adding pool (32), the medicine passes through H₂O₂A dosing pipeline (31) and FeSO₄Add medicine pipeline (34), add the Fenton reagent and carry out catalytic oxidation, get rid of COD, improve the biodegradability of waste water, the stirring mode is air stirring, the iron ion that catalytic oxidation produced and the hydroxyl that adds medicine pipeline (37) through NaOH take place the reaction and generate the ferric hydroxide colloidal sediment to PAM with PAM that PAM adds medicine pipeline (43) added takes place coagulation reaction, form the alum blossom that easily deposits, the stirring mode is mechanical stirring, the institute of coagulation reactionThe formed precipitate is precipitated in a precipitation tank, the generated sludge enters a sludge concentration tank (25), and the supernatant automatically flows into an ABR anaerobic reaction tank (7).

4. The system for treating pharmaceutical wastewater generated by chemical synthesis of refractory pollutants according to claim 1, wherein the system comprises: the ABR anaerobic reaction tank (7) is provided with an elastic three-dimensional filler (8) which is connected with an internal reflux pump (9) for anaerobic biodegradation treatment.

5. The system for treating pharmaceutical wastewater generated by chemical synthesis of refractory pollutants according to claim 1, wherein the system comprises: an aeration disc (11) of the aerobic tank is arranged in the aerobic tank (10), the generated oxygen is distributed in the tank through an aeration pipeline (12) of the aerobic tank, pollutants in water are decomposed and digested by microorganisms attached to a filler (13) of the aerobic tank, organic matters are degraded into water and carbon dioxide, most of the pollutants are removed, and the water quality is purified.

6. The system for treating pharmaceutical wastewater generated by chemical synthesis of refractory pollutants according to claim 1, wherein the system comprises: the secondary sedimentation tank (14) is provided with a sludge discharge pump (16), most of sludge after sedimentation and concentration is taken as inoculated sludge to flow back to the aerobic tank (10) so as to ensure the concentration of suspended solid in the aerobic reactor, and the sludge water flowing in through a water inlet pipeline of the secondary sedimentation tank is sedimentated and separated from other solid matters in the mixed liquid under the action of an inclined tube filler (15) of the secondary sedimentation tank.

7. The system for treating pharmaceutical wastewater generated by chemical synthesis of refractory pollutants according to claim 1, wherein the system comprises: the coagulation reaction sedimentation tank (18), reaction zone and sedimentation zone are provided with agitator (17) and pipe chute filler (19) respectively, in PAC dosing tank (38) and PAM dosing tank (41), PAC/PAM coagulant and coagulant aid are added into water through PAC dosing pipeline (40) and PAM dosing pipeline (43), so that particles which are difficult to precipitate in water can be polymerized mutually to form colloid, and then are combined with impurities in water to form larger flocculating constituents.

8. The system for treating pharmaceutical wastewater generated by chemical synthesis of refractory pollutants according to claim 3, wherein the system comprises: the sludge concentration tank (25) is provided with a sludge discharge pipeline (26), a sludge screw pump (27) is arranged behind the sludge concentration tank, sludge is conveyed to a sludge filter press (28), dewatered sludge is conveyed out for treatment, and the outlet water of the filter press enters the regulating tank (3).

9. The system for treating pharmaceutical wastewater generated by chemical synthesis of refractory pollutants according to any one of claims 3, 4, 6, 7 and 8, wherein the system comprises: excess sludge generated by the catalytic oxidation reactor (6), the ABR anaerobic reaction tank (7), the secondary sedimentation tank (14) and the coagulation reaction sedimentation tank (18) enters a sludge concentration tank (25), supernatant of the sludge concentration tank (25) flows back to the regulating tank (3), sludge in the sludge tank is transported and disposed after being subjected to filter pressing and dehydration by a sludge filter press (28), and filter pressing liquid returns to the regulating tank (3).

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