CN110655265A

CN110655265A - Method for treating pharmaceutical wastewater

Info

Publication number: CN110655265A
Application number: CN201810692301.3A
Authority: CN
Inventors: 胡正涛; 刘艳; 付强; 祁红林; 刘杰
Original assignee: Zhuhai Rundu Pharmaceutical Co Ltd
Current assignee: Zhuhai Rundu Pharmaceutical Co Ltd
Priority date: 2018-06-29
Filing date: 2018-06-29
Publication date: 2020-01-07

Abstract

The invention provides a pharmaceutical wastewater treatment device and a method for treating wastewater by using the device. The equipment and the method can effectively treat different types of wastewater in pharmaceutical factories, improve the wastewater treatment effect, have simple structure, convenient operation, good flotation effect of the coagulation air flotation tank, stable performance, small floor area and convenient operation, and the effluent quality after the treatment of the sewage treatment equipment reaches the requirements of the first-class standard of the discharge limit of water pollutants in Guangdong province (DB 44/26-2001) in the second period and the discharge standard of water pollutants in chemical synthesis pharmaceutical industry (GB 21904-2008).

Description

Method for treating pharmaceutical wastewater

Technical Field

The invention relates to a device for a pharmaceutical factory wastewater treatment technology, in particular to a device for treating high ammonia nitrogen, high salinity and common wastewater in a pharmaceutical factory.

Background

With the rapid development of modern industry, the problem of environmental pollution is more and more serious, wherein the pollution in the pharmaceutical industry becomes the focus of attention. The wastewater produced by pharmaceutical enterprises is characterized by complex components, high concentration, high chroma and high salinity, and part of the pharmaceutical wastewater has unpleasant taste and high toxicity and can be enriched in organisms, such as antibiotic wastewater in chemical synthesis and fermentation. The waste water usually contains a plurality of benzene ring (heterocyclic) organic pollutants, is difficult to decompose and has great harm to environmental water. According to the publication of 'ten items of water', the scale and energy consumption of the wastewater treatment of the existing pharmaceutical enterprises restrict the development of the enterprises, and the danger of discharge which can not reach the standard exists by adopting the general biochemical treatment. Therefore, pharmaceutical wastewater has become a great difficulty in the industrial wastewater treatment field.

Disclosure of Invention

The invention aims to provide a medical wastewater treatment method which is simple in structure, reasonable in design, convenient to use and wide in applicability, aiming at the defects and shortcomings of the prior art.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a treatment facility for pharmaceutical wastewater comprises a pretreatment device, a biochemical treatment main body device, a sludge treatment device and a clear water discharge device which are connected in sequence; the pretreatment device comprises a grid regulating tank and an ozone treatment tank which are connected in sequence, and the biochemical treatment main body device comprises a hydrolysis acidification tank, an anaerobic reaction tower and an A/O tank which are connected in sequence; the sludge treatment device comprises a secondary sedimentation tank, a coagulating sedimentation tank and a spiral-stacked dehydrator which are connected in sequence; the clear water discharging device comprises an ozone treatment pool and a BAF pool which are connected in sequence.

Preferably, a plurality of layers of grids are arranged in the grid adjusting tank, and the grids are arranged from large to small according to gaps; when the wastewater to be treated is high ammonia nitrogen wastewater, a pH adjusting tank is also arranged behind the grid adjusting tank, and the pH adjusting tank is connected with the mechanical vapor recompression system and then connected with the ozone treatment tank; when the wastewater to be treated is high-salinity wastewater, an MVR raw water tank is arranged behind the grid regulating tank and then connected with a pH regulating tank, and the pH regulating tank is connected with a mechanical vapor recompression system and then connected with an ozone treatment tank; when the waste water to be treated is general production waste water, a coagulation air flotation tank is arranged behind the grid adjusting tank. Preferably, a water pump is further arranged between the pH adjusting tank and the ozone treatment tank. The pH adjusting tank is designed into a carbon steel anti-corrosion structure.

Preferably, fold spiral shell hydroextractor and include the support, fold the spiral shell body and flocculation mixing tank, the flocculation mixing tank with fold through the pipe connection between the spiral shell body, fold the spiral shell body and set up on the support, be provided with the mixed mixer of flocculation in the flocculation mixing tank, fold spiral shell body left end connection and have the motor, the motor provides and folds spiral shell body moving power, fold spiral shell body right-hand member portion and pass through the pipe connection mixing tank, fold spiral shell body left end portion and be provided with the mud board that falls that has the slope down, the mud board end that falls is provided with connects the mud support frame, fall be provided with the fender on the mud board connect be provided with the fender on the mud support frame. Preferably, the support is placed on a horizontal plane, the surface of the support has an upward slope, and the overlapped screw body is fixedly arranged on the support.

Preferably, the coagulation air floatation tank includes the air compressor machine, dissolves gas pitcher, air supporting machine and scrapes the sediment machine, and the air compressor machine dissolves the gas pitcher through pipe connection, and in the air compressor machine squeezed compressed air into dissolved gas pitcher, dissolved gas pitcher passed through pipe connection air supporting machine, scraped the sediment machine and set up in air supporting machine top, and the air supporting machine bottom is provided with the wash port. The air compressor pumps compressed air into the dissolved air tank to obtain dissolved air water containing saturated air, the dissolved air water is conveyed into the air floatation machine, micro bubbles and flocs in the wastewater are bonded with each other and enter the separation area together, the flocs and the bubbles rise to the liquid level together under the action of bubble buoyancy to form scum, and the scum is scraped to the sludge area by the scum scraper. The bottom of the air flotation machine is provided with a drain hole, and the clean water at the lower layer is discharged through a water collecting pipe. After treatment, one part of the clear water flows back for use by a gas dissolving system, and the other part is discharged.

When the invention is operated, sewage firstly enters the grid regulating tank to remove soft entanglement, larger particle sundries and floaters in the sewage, thereby protecting the service life of a subsequent working water pump and reducing the system treatment load. The sewage enters the regulating tank for water quantity and quality regulation and homogenization after being treated by the grating, so that the balance and stability of the water quantity and the water quality of a subsequent biochemical treatment system are ensured, organic matters in the sewage play a certain degradation effect, and the impact resistance and the treatment effect of the whole system are improved. The water pump lifts the homogenized and uniform amount of sewage to the ozone treatment tank. In the ozone oxidation pond, ozone is decomposed by chemical and physical chemical methods to generate hydroxyl free radicals, and macromolecules and long-chain organic pollutants in water are oxidized into micromolecular and short-chain substances by the hydroxyl free radicals, and the micromolecular and long-chain organic pollutants are subjected to ring opening and chain breaking to be converted into low-toxicity intermediate products which are easy to biodegrade, or the intermediate products are directly mineralized into inorganic substances. The wastewater treated by the ozone oxidation tank enters a hydrolysis acidification tank, filler is arranged in the hydrolysis acidification tank, under the anoxic state, the hydrolysis acid-producing bacteria hydrolyze the insoluble organic matters in the wastewater into soluble organic matters, the macromolecular substances are degraded into micromolecular substances, and the biodegradability of the wastewater is greatly improved. The pre-acidified water is lifted to an anaerobic reactor by a water pump for treatment, so that a large amount of organic pollution load is removed; the effluent of the anaerobic reactor enters a two-stage A/O system, firstly enters a first-stage A pool, wastewater treated by the first-stage A pool automatically flows into a first-stage O pool for aerobic treatment, so that organic pollutants in the water are further reduced, the effluent of the first-stage O pool enters a second-stage A/O pool for further denitrification and decarburization treatment, an effluent sludge-water mixture is subjected to sludge-water separation in a secondary sedimentation pool, most of sludge flows back to the first-stage A pool and the second-stage A pool, and the rest sludge is discharged into a sludge pool; the effluent of the secondary sedimentation tank automatically flows into a coagulating sedimentation tank, and suspended particles in water are further removed by adding a water treatment agent. And (3) introducing the effluent of the coagulation sedimentation tank into an ozone treatment tank for oxidation treatment to remove residual non-biochemical organic pollutants, lifting the oxidized wastewater to a BAF bioreactor by a pump, further removing organic matters and particles in the wastewater in an aeration biological filter tank, and introducing the effluent of the aeration biological filter tank into a clean water tank to be discharged after reaching the standard. Residual sludge generated by the system is dehydrated by a screw-overlapping dehydrator, filtrate returns to a regulating tank, and mud cakes are transported and disposed.

Advantageous effects

The pharmaceutical wastewater treatment equipment has the advantages that: the spiral shell dehydrator is simple in structure, convenient to operate, good in flotation effect of the coagulation air flotation tank, stable in performance, small in occupied area and convenient to operate, and the quality of outlet water after being treated by the sewage treatment equipment reaches the requirements of 'Guangdong province water pollutant discharge limit' (DB 44/26-2001) second period primary standard and 'chemical synthesis pharmaceutical industry water pollutant discharge standard' (GB 21904-2008).

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a flow chart of the operation of all the devices of the present invention;

FIG. 2 is a schematic structural view of the spiral water extractor of the present invention;

FIG. 3 is a schematic view of the mechanism of the air floating device of the present invention.

Detailed Description

The invention will be further described with reference to the accompanying drawings.

Referring to fig. 1 and 2, a pharmaceutical wastewater treatment device comprises a pretreatment device, a biochemical treatment main body device, a sludge treatment device and a clear water discharge device which are connected in sequence; the pretreatment device comprises a grid regulating tank and an ozone treatment tank which are connected in sequence, and the biochemical treatment main body device comprises a hydrolysis acidification tank, an anaerobic reaction tower and an A/O tank which are connected in sequence; the sludge treatment device comprises a secondary sedimentation tank, a coagulating sedimentation tank and a spiral-stacked dehydrator which are connected in sequence; the clear water discharging device comprises an ozone treatment pool and a BAF pool which are connected in sequence.

A plurality of layers of grids are arranged in the grid adjusting tank and are arranged from large to small according to gaps; when the wastewater to be treated is high ammonia nitrogen wastewater, a pH adjusting tank is also arranged behind the grid adjusting tank, and the pH adjusting tank is connected with the mechanical vapor recompression system and then connected with the ozone treatment tank; when the wastewater to be treated is high-salinity wastewater, an MVR raw water tank is arranged behind the grid regulating tank and then connected with a pH regulating tank, and the pH regulating tank is connected with a mechanical vapor recompression system and then connected with an ozone treatment tank; when the waste water to be treated is general production waste water, a coagulation air flotation tank is arranged behind the grid adjusting tank. And a water pump is also arranged between the pH adjusting tank and the ozone treatment tank. The pH adjusting tank is designed into a carbon steel anti-corrosion structure.

Preferably, fold spiral shell hydroextractor and include support 11, fold the spiral shell body 12 and flocculation mixing tank 13, through the pipe connection between the flocculation mixing tank 13 and the spiral shell body 12 of folding, fold spiral shell body 12 and set up on support 11, be provided with flocculation mixer 14 in the flocculation mixing tank 13, fold spiral shell body 12 left end connection has motor 15, and motor 15 provides and folds spiral shell body 12 moving power, and fold spiral shell body 12 right-hand member portion and pass through pipe connection mixing tank 13, fold spiral shell body 12 left end portion and be provided with the mud board 16 that falls that has the slant slope down, the mud board 16 end that falls is provided with connects mud support frame 17, fall be provided with on the mud board 16 mud guard 18 connect to be provided with on the mud support frame 17 mud guard 19. Preferably, the support 11 is placed on a horizontal plane, the surface of the support 11 has an upward slope, and the stacked spiral body 12 is fixedly arranged on the support 11.

The coagulation air floatation tank comprises an air compressor 21, a dissolved air tank 22, an air floatation machine 23 and a residue scraping machine 24, wherein the air compressor 21 is connected with the dissolved air tank 22 through a pipeline, the air compressor 21 squeezes compressed air into the dissolved air tank 22, the dissolved air tank 22 is connected with the air floatation machine 23 through a pipeline, the residue scraping machine is arranged at the top of the air floatation machine 23, and a drain hole 25 is formed in the bottom of the air floatation machine 23. The air compressor 21 squeezes compressed air into the dissolved air tank 22 to obtain dissolved air water containing saturated air, the dissolved air water is conveyed into the air flotation machine 23, flocculating agents PAC and PAM are added into the air flotation machine 23 to enable suspended matters in the wastewater to flocculate suspended particles with larger molecules, micro bubbles and flocs in the wastewater are mutually bonded and enter the separation area together, the flocs and the bubbles rise to the liquid level together under the action of bubble buoyancy to form scum, and the scum is scraped to the sludge area by the scum scraper 24. The bottom of the air flotation machine 23 is provided with a drain hole 25, and the clean water at the lower layer is drained through a water collecting pipe. After treatment, one part of the clear water flows back for use by a gas dissolving system, and the other part is discharged.

The operation of the wastewater treatment apparatus of the present invention will be described below by taking specific wastewater types as examples.

TABLE 1 Water quality and Water volume of wastewater

Serial number	Class of waste water	Amount of water	pH	COD	Ammonia nitrogen	Salinity%
							1	General waste water of production	350	7.06	20000	120	1.2
2	High ammonia nitrogen waste water	23	9.56	72000	10000	3
							3	High salinity waste water	89	6.8	90000	900	12

A pretreatment step: the general production wastewater is collected to a grid adjusting tank through a collecting pipe network, a submersible mixer is arranged in the grid adjusting tank for mixing and stirring, the effluent of the grid adjusting tank is pumped into a coagulation air floatation tank through a pump, and the effluent of the coagulation air floatation tank is merged into an ozone treatment tank to be combined with other wastewater for treatment.

The high ammonia nitrogen wastewater is collected to a grid adjusting tank through a collecting pipe network, pumped into a pH adjusting tank by a pump, added with a medicament to adjust the pH of the wastewater, controlled at about 5 ~ 6, merged into a subsequent MVR raw water tank for MVR concentration treatment, and then enters an ozone treatment tank to be combined with other wastewater for treatment.

Collecting the high-salinity wastewater to a grid regulating tank through a collecting pipe network, pumping the high-salinity wastewater into an MVR raw water tank by a pump, mixing the high-salinity wastewater with other pretreated wastewater, pumping the high-salinity wastewater into an MVR evaporator by the pump to remove the salt in the wastewater, collecting the condensate, feeding the condensate into an ozone treatment tank, and combining the condensate with other wastewater for treatment.

Biochemical treatment, sludge treatment and clear water discharge: the hydrolysis acid-producing bacteria hydrolyze insoluble organic matters in the sewage into soluble organic matters, macromolecular substances are degraded into micromolecular substances, and the biodegradability of the sewage is greatly improved. The pre-acidified water is lifted to an anaerobic reactor by a water pump for treatment, so that a large amount of organic pollution load is removed; the effluent of the anaerobic reactor enters a two-stage A/O system, firstly enters a first-stage A pool, wastewater treated by the first-stage A pool automatically flows into a first-stage O pool for aerobic treatment, so that organic pollutants in the water are further reduced, the effluent of the first-stage O pool enters a second-stage A/O pool for further denitrification and decarburization treatment, an effluent sludge-water mixture is subjected to sludge-water separation in a secondary sedimentation pool, most of sludge flows back to the first-stage A pool and the second-stage A pool, and the rest sludge is discharged into a sludge pool; the effluent of the secondary sedimentation tank automatically flows into a coagulating sedimentation tank, and suspended particles in water are further removed by adding a water treatment agent. And the effluent of the coagulation sedimentation tank enters an ozone treatment tank for oxidation treatment to remove residual non-biochemical organic pollutants, the oxidized wastewater enters an intermediate water tank and is lifted to a BAF bioreactor by a pump, organic matters and particles in the wastewater are further removed in an aeration biological filter tank, and the effluent of the aeration biological filter tank enters a clean water tank and is discharged after reaching the standard. Residual sludge generated by the system is dehydrated by a screw-overlapping dehydrator, filtrate returns to a regulating tank, and mud cakes are transported and disposed.

The pharmaceutical wastewater treatment equipment provided by the invention is adopted for treatment, and the operation result shows that the quality of the effluent water treated by the sewage treatment equipment meets the requirements of the first-class standard of the second-period standard of the Guangdong province water pollutant discharge limit (DB 44/26-2001) and the discharge standard of the chemical synthesis pharmaceutical industry water pollutants (GB 21904-2008).

Claims

1. The utility model provides a treatment facility of pharmacy waste water which characterized in that: the equipment comprises a pretreatment device, a biochemical treatment main body device, a sludge treatment device and a clear water discharge device which are connected in sequence; the pretreatment device comprises a grid regulating tank and an ozone treatment tank which are connected in sequence, and the biochemical treatment main body device comprises a hydrolysis acidification tank, an anaerobic reaction tower and an A/O tank which are connected in sequence; the sludge treatment device comprises a secondary sedimentation tank, a coagulating sedimentation tank and a spiral-stacked dehydrator which are connected in sequence; the clear water discharging device comprises an ozone treatment pool and a BAF pool which are connected in sequence.

2. The treatment equipment according to claim 1, further characterized in that a plurality of layers of grids are arranged in the grid adjusting tank, and the grids are arranged from large to small according to gaps; when the wastewater to be treated is high ammonia nitrogen wastewater, a pH adjusting tank is also arranged behind the grid adjusting tank, and the pH adjusting tank is connected with the mechanical vapor recompression system and then connected with the ozone treatment tank; when the wastewater to be treated is high-salinity wastewater, an MVR raw water tank is arranged behind the grid regulating tank and then connected with a pH regulating tank, and the pH regulating tank is connected with a mechanical vapor recompression system and then connected with an ozone treatment tank; when the waste water to be treated is general production waste water, a coagulation air floatation tank is also arranged behind the grid adjusting tank; a water pump is also arranged between the pH adjusting tank and the ozone treatment tank; the pH adjusting tank is designed into a carbon steel anti-corrosion structure.

3. The processing equipment according to claim 1, wherein the screw stacking dehydrator comprises a support (11), a screw stacking body (12) and a flocculation mixing tank (13), the flocculation mixing tank (13) is connected with the screw stacking body (12) through a pipeline, the screw stacking body (12) is arranged on the support (11), a flocculation mixing stirrer (14) is arranged in the flocculation mixing tank (13), the left end of the screw stacking body (12) is connected with a motor (15), the motor (15) provides power for the operation of the screw stacking body (12), the right end of the screw stacking body (12) is connected with the mixing tank (13) through a pipeline, the left end of the screw stacking body (12) is provided with a mud dropping plate (16) with an oblique downward slope, the mud falling plate is characterized in that a mud receiving support frame (17) is arranged at the tail end of the mud falling plate (16), a mud guard (18) is arranged on the mud falling plate (16), and a mud guard (19) is arranged on the mud receiving support frame (17).

4. The treatment apparatus according to claim 3, further characterized in that the support (11) is placed on a horizontal surface, the surface of the support (11) has an upward inclination, and the stacked spiral body (12) is fixedly arranged on the support (11).

5. The treatment equipment according to claim 1, wherein the coagulation air flotation tank comprises an air compressor (21), a dissolved air tank (22), an air flotation machine (23) and a residue scraping machine (24), the air compressor (21) is connected with the dissolved air tank (22) through a pipeline, the air compressor (21) pumps compressed air into the dissolved air tank (22), the dissolved air tank (22) is connected with the air flotation machine (23) through a pipeline, the residue scraping machine is arranged on the top of the air flotation machine (23), and a drain hole (25) is formed in the bottom of the air flotation machine (23).

6. A method of treating wastewater using the apparatus of claims 1-5, characterized by: comprises the steps of pretreatment, biochemical treatment, sludge treatment and clear water discharge.

7. The method for treating pharmaceutical wastewater according to claim 6, wherein the pretreatment comprises collecting general production wastewater through a collection pipe network to a grid regulation tank, mixing and stirring the general production wastewater with a submersible mixer in the grid regulation tank, pumping the effluent of the grid regulation tank into a coagulation air flotation tank through a pump, merging the effluent of the coagulation air flotation tank into an ozone treatment tank, and combining the effluent with other wastewater, collecting high ammonia nitrogen wastewater through a collection pipe network to the grid regulation tank, pumping the wastewater into a pH regulation tank through a pump, adding a chemical to regulate the pH of the wastewater to about 5 ~ 6, merging the high ammonia nitrogen wastewater after pH regulation into a subsequent MVR raw water tank for MVR concentration treatment, and then pumping the high ammonia nitrogen wastewater into an ozone treatment tank to combine with other wastewater, collecting the high salinity wastewater through a collection pipe network to the grid regulation tank, pumping the high salinity wastewater into the MVR raw water tank through a pump, mixing the high salinity wastewater with other pretreated wastewater, and pumping the condensate into the ozone treatment tank to combine with other wastewater.

8. The method for treating pharmaceutical wastewater according to claim 6, further characterized by: biochemical treatment, sludge treatment and clear water discharge: the hydrolysis acid-producing bacteria hydrolyze insoluble organic matters in the sewage into soluble organic matters, macromolecular substances are degraded into micromolecular substances, the biodegradability of the sewage is greatly improved, and pre-acidified water is lifted to an anaerobic reactor by a water pump for treatment to remove a large amount of organic pollution load; the effluent of the anaerobic reactor enters a two-stage A/O system, firstly enters a first-stage A pool, wastewater treated by the first-stage A pool automatically flows into a first-stage O pool for aerobic treatment, so that organic pollutants in the water are further reduced, the effluent of the first-stage O pool enters a second-stage A/O pool for further denitrification and decarburization treatment, an effluent sludge-water mixture is subjected to sludge-water separation in a secondary sedimentation pool, most of sludge flows back to the first-stage A pool and the second-stage A pool, and the rest sludge is discharged into a sludge pool; the effluent of the secondary sedimentation tank automatically flows into a coagulating sedimentation tank, suspended particles in water are further removed by adding a water treatment agent, the effluent of the coagulating sedimentation tank enters an ozone treatment tank for oxidation treatment to remove residual non-biochemical organic pollutants, the oxidized wastewater enters an intermediate water tank and is lifted to a BAF bioreactor by a pump, organic matters and particles in the wastewater are further removed in an aeration biological filter tank, the effluent of the aeration biological filter tank enters a clear water tank for standard discharge, the residual sludge generated by the system is dehydrated by a spiral-stacking dehydrator, the filtrate returns to an adjusting tank, and mud cakes are transported and treated outside.