A steroid drug production wastewater treatment system, integrated oxidation pond and working method thereof

Abstract

The present invention discloses a steroid drug production wastewater treatment system, a comprehensive oxidation tank and a working method thereof. The steroid drug production wastewater treatment system of the present invention is used to treat wastewater generated in the production process of steroid drug intermediates, and includes a regulating tank, a USR reactor, a UASB reactor, a comprehensive oxidation tank, a hydrolysis acidification tank, an SBR tank and a flotation sedimentation tank connected in series from front to back. The production wastewater is collected in the regulating tank, and finally the drain pipe outputs the supernatant of the flotation sedimentation tank; the comprehensive oxidation tank performs facultative and aerobic treatment on organic matter in the wastewater in different regions. The present invention also discloses a comprehensive oxidation tank used in the steroid drug production wastewater treatment system and a working method thereof. The present invention performs deep biochemical treatment on wastewater to meet the discharge requirements.

Description

Technical Field

[0001] The invention relates to the technical field of steroid drug production, and in particular to a steroid drug production wastewater treatment system, a comprehensive oxidation pond and a working method thereof. Background Art

[0002] Hydroxyandrostenedione is an important steroid drug intermediate. It can be used as a precursor of hormone substances such as androgens and protein synthesis hormones, and can also be used to synthesize drugs such as spironolactone, hydrocortisone, prednisolone oxide, and dexamethasone. It has broad market application prospects and high commercial value. At present, the production methods of hydroxyandrostenedione mainly include chemical synthesis and microbial transformation. Among them, the microbial transformation method uses the enzyme produced by microbial metabolism as a catalyst to generate another new substance through enzymatic reaction with substrates or groups, and its transformation products do not belong to the products of metabolism itself. Compared with the traditional simple chemical synthesis method, biological transformation has the characteristics of fewer synthesis steps, short production cycle, mild reaction conditions, green and safe, less pollution, high yield, fewer side reactions, and strong regional selectivity.

[0003] However, in the process of preparing steroid drugs such as hydroxyandrostenedione by biological fermentation, intermediate pharmaceutical factories will produce a variety of wastewaters. These wastewaters mainly come from production steps such as fermentation, filtration, extraction, crystallization, refining, and refining. Specifically, the wastewater mainly includes fermentation liquid, tank pipe flushing wastewater, and extraction and refining wastewater. Compared with other sewage discharge conditions, the main characteristics of the sewage generated by this production process are that it contains more bacterial residues and more residual nutrients (i.e., high COD, high total nitrogen, high total phosphorus, high total dissolved solids, high chroma, etc.), and the water quality is highly volatile and the water volume is unstable. With the further improvement of sewage discharge standards, it is necessary to deeply treat production wastewater to meet discharge requirements. The existing simple sewage treatment system can no longer meet the requirements.

[0004] Therefore, there is an urgent need for a steroid drug production wastewater treatment system, a comprehensive oxidation pond and a working method thereof to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a steroid drug production wastewater treatment system, a comprehensive oxidation pond and a working method thereof, which can carry out deep biochemical treatment on the wastewater and meet the discharge requirements.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention discloses a steroid drug production wastewater treatment system, which is used for treating wastewater generated in the production process of steroid drug intermediates, and comprises a regulating tank, a USR reactor, a UASB reactor, a comprehensive oxidation tank, a hydrolysis acidification tank, an SBR tank and a flotation sedimentation tank which are connected in series from front to back. The production wastewater is collected in the regulating tank, and finally the supernatant of the flotation sedimentation tank is outputted through a drain pipe; the comprehensive oxidation tank performs facultative anoxic and aerobic treatment on organic matter in the wastewater in different regions.

[0008] Furthermore, it also includes a carbon source bypass branch, which is connected between the water outlet pipe of the USR reactor and the hydrolysis acidification tank.

[0009] Furthermore, it also includes a sludge thickening tank and a filter press. The sludge thickening tank collects the bottom sludge of the activated sludge screening area of ​​the comprehensive oxidation tank, the hydrolysis acidification tank and the flotation sedimentation tank, and the filter press filters and dries the sludge discharged from the sludge thickening tank.

[0010] The present invention also discloses a comprehensive oxidation pond, which is used in any of the above-mentioned steroid drug production wastewater treatment systems, and comprises a comprehensive oxidation pond body, a delivery pipe and a partition. The inner cavity of the comprehensive oxidation pond body is divided into a high-load reaction zone, a low-load aerobic reaction zone and an activated sludge screening zone by multiple partitions, and multiple delivery pipes are connected between the high-load reaction zone, the low-load aerobic reaction zone and the activated sludge screening zone.

[0011] Furthermore, the activated sludge screening area includes a sludge screening area one and a sludge screening area two, and the sludge screening area one and the sludge screening area two are divided by the partition. The sludge screening area one is connected to the low-load aerobic reaction area through the conveying pipe and is connected to the sludge screening area two through the liquid supply pipe, and the sludge screening area two is output to the hydrolysis acidification tank.

[0012] Furthermore, it also includes a reflux pump, a reflux pipe, a mixing pump and a spray water distributor. The reflux pump is arranged in the sludge screening area 2 and the output port is connected to the reflux pipe, and the other end of the reflux pipe is connected to the main liquid inlet pipe for feeding the high-load reaction area; the mixing pump is installed on the main liquid inlet pipe and distributes the material to the high-load reaction area through the spray water distributor.

[0013] Furthermore, a water diversion weir is centrally arranged in the second sludge screening area, the cross-section of the top of the water diversion weir is an isosceles triangle, the liquid outlet of the liquid supply pipe is located directly above the middle position of the water diversion weir; the mud suction pipe outlet of the reflux pump is located on both sides of the middle position of the water diversion weir.

[0014] Furthermore, there are two reflux pumps, which are respectively located on both sides of the water diversion weir; pump seats are provided on the two side walls of the sludge screening area, the reflux pump is installed on the pump seat and the feed port is connected to the sludge extraction pipe port below.

[0015] Furthermore, a valve is provided on the liquid supply pipe.

[0016] The present invention also discloses a comprehensive oxidation pond working method, which uses any one of the above-mentioned comprehensive oxidation ponds to recycle activated sludge, and uses a spray water distributor to evenly distribute the recovered active sludge liquid to a high-load reaction zone.

[0017] Compared with the prior art, the beneficial technical effects of the present invention are:

[0018] The steroid drug production wastewater treatment system of the present invention adopts a two-stage anaerobic series mode to deeply remove suspended matter and organic pollutants in wastewater and reduce the chromaticity of water. The USR reactor is a primary anaerobic reactor, which mainly hydrolyzes and acidifies suspended matter and large molecular soluble solids in water into small molecular organic matter, and the UASB reactor is a secondary anaerobic reactor, which mainly converts most of the organic matter in water into biogas. The comprehensive oxidation tank reduces the COD, ammonia nitrogen and part of the total nitrogen in water through the joint action of facultative anaerobic bacteria and aerobic bacteria. The hydrolysis and acidification tank further reduces the total nitrogen in water under the action of denitrifying bacteria, and converts most of the remaining large molecular soluble solids in the water into biodegradable small molecular organic carbon sources. The SBR tank is a batch-sequential biochemical tank that removes excess organic pollutants in the effluent of the hydrolysis and acidification tank, thereby achieving the purpose of meeting the discharge standards. In addition, by setting the carbon source bypass branch, part of the effluent sewage of the USR reactor can be provided to the hydrolysis acidification tank as a carbon source nutrient source, promoting the proliferation of denitrifying bacteria and effectively removing nitrogen; compared with the additional addition of glucose, lactic acid, sodium acetate and other carbon sources, the initial hydrolysis acidification sewage is directly used as the carbon source, which also reduces the processing capacity of the UASB reactor and the comprehensive aerobic tank, and solves the problems of poor control of carbon source input, high investment cost, high operating cost, and high management and maintenance cost. By setting up the sludge thickening tank and filter press, the sludge is centrally treated, and the output dry sludge can be recycled as an organic fertilizer raw material.

[0019] The comprehensive oxidation pond of the present invention can be reasonably divided into functional areas by installing the partitions separating the inner cavity of the main body of the comprehensive oxidation pond, which is conducive to the targeted removal of pollutants in sewage; by setting up sludge screening area one and sludge screening area two, graded sedimentation is carried out to facilitate the screening of sludge with better activity for reflux. By setting up a mixing pump and a spray water distributor, the reflux pipe can be introduced into the activated sludge water body and fully mixed at the inlet end of the spray water distributor before distribution, ensuring sufficient and uniform contact between bacteria and materials. The bottom of the sludge screening area two is divided into two equal mud turning areas by setting a water diversion weir in the middle of the sludge screening area two. When the liquid outlet of the liquid supply pipe in the middle and above drops the material, the liquid material is divided into two streams by the water diversion weir and injected obliquely downward into the sludge bed, which plays a role in water flow impact and stirring, and lifts the activated sludge with lower density. The sludge suction pipe outlet draws the activated sludge with lower density away for reflux.

[0020] The comprehensive oxidation pond working method of the present invention distributes the recovered active sludge liquid by using a spray water distributor, thereby improving the contact between microorganisms and materials, improving the reaction efficiency, and effectively inhibiting the generation of biological foam due to excessive impact load; the activated sludge is screened by water flow impact, avoiding the use of mechanical stirring, and the screening effect is good and the operation is economical; pulse feeding is adopted through the liquid supply pipe in the sludge screening area 2, thereby improving the water flow stirring effect and avoiding long-term continuous operation of the pump group. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the steroid drug production wastewater treatment system of the present invention;

[0023] Figure 2 It is a schematic diagram of the top view layout of the comprehensive oxidation pond of the present invention;

[0024] Figure 3 It is a schematic diagram of the cross-sectional structure of the comprehensive oxidation pond of the present invention.

[0025] Explanation of the reference numerals in the accompanying drawings: 1. Main body of the integrated oxidation pond; 101. High-load reaction zone; 102. Low-load aerobic reaction zone; 103. Sludge screening zone one; 104. Sludge screening zone two; 105. Pump seat; 2. Liquid supply pipe; 201. Valve; 3. Water diversion weir; 301. Support leg; 4. Reflux pump; 401. Mud extraction pipe outlet; 5. Reflux pipe; 6. Mixing pump; 7. Main liquid inlet pipe; 8. Spray water distributor. DETAILED DESCRIPTION

[0026] The core of the present invention is to provide a steroid drug production wastewater treatment system, a comprehensive oxidation pond and a working method thereof, which can carry out deep biochemical treatment on the wastewater and meet the discharge requirements.

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] With reference to the accompanying drawings, Figure 1 This is a schematic diagram of the steroid drug production wastewater treatment system of the present invention; Figure 2 It is a schematic diagram of the top view layout of the comprehensive oxidation pond of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the comprehensive oxidation pond of the present invention. Example 1

[0030] In a specific embodiment, Figure 1 As shown, the steroid drug production wastewater treatment system of the present invention is used to treat the wastewater generated in the production process of steroid drug intermediates, which includes a regulating tank, a USR reactor, a UASB reactor, a comprehensive oxidation tank, a hydrolysis acidification tank, an SBR tank and a flotation sedimentation tank connected in series from front to back. The production wastewater is collected in the regulating tank at the feed end. The specific regulating tank also includes a water volume regulating tank and a pH regulating tank. Quicklime is added to the pH regulating tank to adjust the pH of the material. An inlet filter plate is arranged in front of the water volume regulating tank to filter out bacterial residues or large particles of organic solids in the inlet water. At the final drainage end, the last drainage pipe outputs the supernatant of the flotation sedimentation tank. The comprehensive oxidation tank performs anaerobic and aerobic treatment on the organic matter in the sewage in different regions.

[0031] Specifically, if Figure 1 As shown, the steroid drug production wastewater treatment system of the present invention also includes a Roots blower. Aeration pipes are arranged at the bottom of the comprehensive oxidation pond and the SBR pond. The Roots blower transports fresh air to the aeration pipes at the bottom of the ponds to supplement oxygen.

[0032] The present invention adopts a two-stage anaerobic series mode to deeply remove suspended matter and organic pollutants in sewage and reduce the chromaticity of water. The USR reactor is a primary anaerobic reactor, which mainly hydrolyzes and acidifies suspended matter and large molecular soluble solids in the water into small molecular organic matter. The UASB is a secondary anaerobic reactor, which mainly converts most of the organic matter in the water into biogas. The comprehensive oxidation tank reduces the COD, ammonia nitrogen and part of the total nitrogen in the water through the joint action of facultative anaerobic bacteria and aerobic bacteria. The hydrolysis and acidification tank further reduces the total nitrogen in the water under the action of denitrifying bacteria, and converts most of the remaining large molecular soluble solids in the water into biodegradable small molecular organic carbon sources. The SBR tank is a batch biochemical tank that removes excess organic pollutants in the effluent of the hydrolysis and acidification tank, thereby achieving the purpose of meeting the discharge standards.

[0033] In a specific implementation of this embodiment, Figure 1 As shown, the steroid drug production wastewater treatment system of the present invention further comprises a carbon source bypass branch, which is connected between the USR reactor outlet pipe and the hydrolysis acidification tank. A material delivery pump and a metering device are required to be provided on the carbon source bypass branch.

[0034] By setting the carbon source bypass branch, part of the effluent sewage of the USR reactor can be provided to the hydrolysis acidification tank as a carbon source nutrient source, so as to promote the growth of denitrifying bacteria and effectively remove nitrogen. Compared with the additional addition of carbon sources such as glucose, lactic acid, sodium acetate, etc., the sewage that is initially hydrolyzed and acidified is directly used as the carbon source, which also reduces the processing capacity of the UASB reactor and the comprehensive aerobic tank, and solves the problems of poor control of the carbon source input amount, high investment cost, high operating cost, and high management and maintenance cost.

[0035] It should be pointed out that in order to ensure that the denitrifying bacteria in the hydrolysis acidification tank obtain sufficient nutrients, during the actual operation of the system, the operators often drain more materials through the carbon source bypass branch. By setting up an SBR tank, the remaining organic pollutants can also be treated by anaerobic, facultative anaerobic and aerobic reactions. The advantage of doing so is that the operating skill level requirements of the operators are reduced, the system is impact-resistant, more stable in operation and economical.

[0036] In a specific implementation of this embodiment, the steroid drug production wastewater treatment system of the present invention also includes a sludge thickening tank and a filter press. The sludge spiral conveying pipe of the sludge thickening tank collects the bottom sludge of the activated sludge screening area of ​​the comprehensive oxidation tank, the hydrolysis acidification tank and the flotation sedimentation tank, and the filter press filters and dries the sludge discharged from the sludge thickening tank.

[0037] The sludge is processed centrally by setting up sludge thickening tanks and filter presses, and the output dry sludge can be recycled as organic fertilizer raw material.

[0038] In summary, the steroid drug production wastewater treatment system of the present invention adopts a two-stage anaerobic series mode to deeply remove suspended matter and organic pollutants in wastewater and reduce the chromaticity of water. Among them, the USR reactor is a primary anaerobic reactor, which mainly hydrolyzes and acidifies suspended matter and large molecular soluble solids in the water into small molecular organic matter, and the UASB is a secondary anaerobic reactor, which mainly converts most of the organic matter in the water into biogas. The comprehensive oxidation tank reduces the COD, ammonia nitrogen and part of the total nitrogen in the water through the joint action of facultative anaerobic bacteria and aerobic bacteria. The hydrolysis and acidification tank further reduces the total nitrogen in the water under the action of denitrifying bacteria, and converts most of the remaining large molecular soluble solids in the water into biodegradable small molecular organic carbon sources. The SBR tank is a batch-sequential biochemical tank that removes excess organic pollutants in the effluent of the hydrolysis and acidification tank, thereby achieving the purpose of meeting the discharge standards. In addition, by setting the carbon source bypass branch, part of the effluent sewage of the USR reactor can be provided to the hydrolysis acidification tank as a carbon source nutrient source, promoting the proliferation of denitrifying bacteria and effectively removing nitrogen; compared with the additional addition of glucose, lactic acid, sodium acetate and other carbon sources, the initial hydrolysis acidification sewage is directly used as the carbon source, which also reduces the processing capacity of the UASB reactor and the comprehensive aerobic tank, and solves the problems of poor control of carbon source input, high investment cost, high operating cost, and high management and maintenance cost. By setting up the sludge thickening tank and filter press, the sludge is centrally treated, and the output dry sludge can be recycled as an organic fertilizer raw material. Example 2

[0039] A comprehensive oxidation pond, such as Figure 2 As shown, the steroid drug production wastewater treatment system used in the above embodiment includes a comprehensive oxidation pond body 1, a conveying pipe and a baffle. The inner cavity of the comprehensive oxidation pond body 1 is divided into a high-load reaction zone 101, a low-load aerobic reaction zone 102 and an activated sludge screening zone by multiple baffles. The high-load reaction zone 101, the low-load aerobic reaction zone 102 and the activated sludge screening zone are arranged in sequence from front to back. A plurality of the conveying pipes are connected between the high-load reaction zone 101, the low-load aerobic reaction zone 102 and the activated sludge screening zone, and the conveying pipes play a role in material circulation. Aeration pipes are provided at the bottom of the high-load reaction zone 101 and the low-load aerobic reaction zone 102. It should be noted that the aeration amount of the high-load reaction zone 101 is controlled so that the microorganisms in the region are in the anoxic and aerobic dual reaction zone. The high-load reaction zone 101 carries out complex microbial treatments such as facultative anerobic and aerobic, performs denitrification reaction to effectively remove nitrogen, and further removes COD. At the same time, the low-load aerobic reaction zone 102 performs low-load aerobic treatment to remove more than 95% of ammonia nitrogen.

[0040] Specifically, if Figure 2As shown, the activated sludge screening area includes a sludge screening area 103 and a sludge screening area 2 104. The sludge screening area 103 and the sludge screening area 2 104 are separated by a partition. The sludge screening area 103 is connected to the low-load aerobic reaction area 102 through the conveying pipe and is connected to the sludge screening area 2 104 through the liquid supply pipe 2. The sludge screening area 2 104 is output to the hydrolysis acidification tank. The material treated by the low-load aerobic reaction area 102 contains a large amount of suspended solids, and the density of these suspended solids is different. The activated sludge containing bacteria with better activity has a lighter density. Most of the sludge with higher density is precipitated in the sludge screening area 103.

[0041] By installing the partitions in the inner cavity of the comprehensive oxidation pond body 1, it is possible to divide it into reasonable areas according to its functions, which is conducive to the targeted removal of pollutants in the sewage; by setting up the sludge screening area 103 and the sludge screening area 2 104, graded sedimentation is carried out, which makes it easy to screen out sludge with better activity for reflow.

[0042] In a specific implementation of this embodiment, Figure 2 and Figure 3 As shown, the comprehensive oxidation pond of the present invention further includes a reflux pump 4, a reflux pipe 5, a mixing pump 6 and a spray water distributor 8. The reflux pump 4 is arranged in the sludge screening area 2 104 and the output port is connected to the reflux pipe 5, and the other end of the reflux pipe 5 is connected to the main liquid inlet pipe 7 for feeding the high-load reaction area 101. The mixing pump 6 is installed on the main liquid inlet pipe 7 and distributes the material to the high-load reaction area 101 through the spray water distributor 8.

[0043] Specifically, the spray water distributor 8 includes a horizontal pipe and a vertical branch pipe. A plurality of the vertical branch pipes are connected to one side of the horizontal pipe. The vertical branch pipes are evenly arranged above the high-load reaction zone 101. A plurality of nozzles are installed at the bottom of the vertical branch pipes and are evenly spaced along the length direction of the vertical branch pipes.

[0044] Through the arrangement of the mixing pump 6 and the spray water distributor 8, the return pipe 5 can be introduced into the activated sludge water body for sufficient mixing at the inlet end of the spray water distributor 8 before distribution, thereby ensuring sufficient and uniform contact between bacteria and materials, and evenly distributing the materials while avoiding a large amount of biological foam caused by hydraulic impact.

[0045] In a specific implementation of this embodiment, Figure 2 and Figure 3As shown, a water diversion weir 3 is arranged in the center of the sludge screening area 2 104, and the water diversion weir 3 divides the sludge screening area 2 104 into two equal areas, which are defined as mud turning areas. The cross-section at the top of the water diversion weir 3 is an isosceles triangle, and the liquid outlet of the liquid supply pipe 2 is located directly above the middle position of the water diversion weir 3. The support legs 301 at the bottom of the water diversion weir 3 are a hollow structure, that is, the bottoms of the two mud turning areas are connected. The mud extraction pipe openings 401 of the reflux pump 4 are located on both sides of the middle position of the water diversion weir 3, that is, the mud extraction pipe openings 401 are located at the top of the mud turning area.

[0046] Obviously, the cross section of the top of the water diversion weir 3 can also be a convex arc shape, which can play the role of central water diversion. Central water diversion to the two mud turning areas can make full use of the horizontal cross-sectional area of ​​the sludge screening area 2 104 and fully lift the active sludge on the sludge bed. Similar simple replacement methods all fall within the protection scope of the present invention.

[0047] Specifically, a coarse-mesh filtering screen is installed at the port of the mud extraction pipe port 401 to prevent large particles of impurities from flowing back into the reflux pipe 5 .

[0048] Specifically, if Figure 2 and Figure 3 As shown, there are two reflux pumps 4, which are respectively located on both sides of the water diversion weir 3. A pump seat 105 is provided on the side wall of the sludge screening area 104, and the reflux pump 4 is installed on the pump seat 105, and the feed port is connected to the sludge extraction pipe port 401 below.

[0049] Specifically, if Figure 2 and Figure 3 As shown, a valve 201 is provided on the liquid supply pipe 2. Preferably, the valve 201 is an electrically controlled gate valve, which operates in conjunction with the reflux pump 4, that is, when the valve 201 is opened, the reflux pump 4 starts to work.

[0050] The bottom of the second sludge screening area 104 is divided into two equal mud turning areas by setting a water dividing weir 3 in the middle of the second sludge screening area 104. When the liquid material falls from the liquid outlet of the liquid supply pipe 2 in the middle, the liquid material is divided into two streams by the water dividing weir 3 and injected obliquely downward into the sludge bed, which plays a role of water flow impact stirring, and the activated sludge with smaller density is lifted up. The sludge pumping port 401 pumps the activated sludge with smaller density backflow. The sludge extracted by the sludge pumping port 401 has a large amount of water, is in a thin mud liquid state, and is easy to flow. There are no large fixed particles, and the nozzle of the spray water distributor 8 will not be blocked.

[0051] The working process of the comprehensive oxidation pond of the present invention is as follows: the material passing through the UASB reactor first enters the high-load reaction zone 101 through the main liquid inlet pipe 7 in a pulsed manner. At this stage, aerobic and anaerobic microbial treatment is carried out in the high-load reaction zone 101, and the denitrifying bacteria use the remaining organic matter and nitrate to denitrify, and reduce the nitrate nitrogen to nitrogen gas and release it into the air. The material enters the low-load aerobic reaction zone 102 again through the conveying pipe. At this stage, the nitrifying bacteria in the low-load aerobic reaction zone 102 perform nitrification to convert ammonia nitrogen in the wastewater into nitrate, and the polyphosphate bacteria perform aerobic phosphorus absorption, and the remaining organic matter is also oxidized by aerobic bacteria here. The material enters the sludge screening zone 103 again through the conveying pipe, and the dead sludge with a larger density is first precipitated in the sludge screening zone 103, and the supernatant enters the sludge screening zone 2 104 again through the liquid supply pipe 2. When the liquid material falls from the liquid outlet of the liquid supply pipe 2, the liquid material is divided into two streams by the water diversion weir 3 and injected obliquely downward into the sludge bed. The obliquely injected water flow impacts and stirs the sludge bed, lifting the activated sludge with a smaller density. The lifted activated sludge just surrounds the periphery of the opposite side mud pumping port 401. The mud pumping port 401 extracts the activated sludge with a smaller density, and the dead mud at the bottom is transported to the sludge concentration tank. It enters the main liquid inlet pipe 7 through the reflux pipe 5, and is then mixed and pumped by the mixing pump 6 to the spray water distributor 8, which evenly distributes the material to the high-load reaction area 101. In fact, in order to improve the mud turning effect, when the valve 201 on the liquid supply pipe 2 is opened, the reflux pump 4 and the mixing pump 6 work synchronously, and a pulse feeding method is adopted to increase the impact water volume. Example 3

[0052] A comprehensive oxidation pond working method is disclosed, which uses the comprehensive oxidation pond described in the above embodiment to recycle activated sludge, and uses a spray water distributor to evenly distribute the recovered active sludge liquid to a high-load reaction zone.

[0053] In a specific implementation manner of an embodiment, the activated sludge is lifted up by the impact of the feed water flow in the sludge screening area 2, and then sucked away by the sludge suction pipe and returned.

[0054] In a specific implementation of an embodiment, the liquid supply pipe in the sludge screening area 2 adopts a pulsed feeding method, which increases the instantaneous water supply and improves the water flow stirring effect. At the same time, the reflux pump for sludge reflux starts to work.

[0055] By using a spray water distributor to distribute the recovered active sludge, the contact between microorganisms and materials is improved, the reaction efficiency is increased, and the generation of biological foam due to excessive impact load is effectively suppressed; the activated sludge is screened by water flow impact, avoiding the use of mechanical stirring, with good screening effect and economical operation; pulse feeding is adopted through the liquid supply pipe in the sludge screening area 2, which improves the water flow stirring effect and avoids long-term continuous operation of the pump group.

[0056] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0057] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A steroid drug production wastewater treatment system, used to treat wastewater generated in the production process of steroid drug intermediates, characterized in that: It includes a regulating tank, a USR reactor, a UASB reactor, a comprehensive oxidation tank, a hydrolysis acidification tank, an SBR tank and a flotation sedimentation tank connected in series from front to back, the production wastewater is collected in the regulating tank, and finally the supernatant of the flotation sedimentation tank is outputted from the drainage pipe; the comprehensive oxidation tank performs facultative and aerobic treatment on organic matter in the wastewater in different regions; it also includes a carbon source bypass branch, which is connected between the outlet pipe of the USR reactor and the hydrolysis acidification tank; The comprehensive oxidation pond comprises a comprehensive oxidation pond body (1), a delivery pipe and a partition. The comprehensive oxidation pond body (1) is provided with a plurality of partitions to divide the inner cavity into a high-load reaction zone (101), a low-load aerobic reaction zone (102) and an activated sludge screening zone. A plurality of delivery pipes are connected between the high-load reaction zone (101), the low-load aerobic reaction zone (102) and the activated sludge screening zone. The activated sludge screening area comprises a sludge screening area 1 (103) and a sludge screening area 2 (104), wherein the sludge screening area 1 (103) and the sludge screening area 2 (104) are separated by the partition, the sludge screening area 1 (103) is connected to the low-load aerobic reaction area (102) through the conveying pipe and is connected to the sludge screening area 2 (104) through the liquid supply pipe (2), and the sludge screening area 2 (104) is output to the hydrolysis acidification tank; It also includes a reflux pump (4), a reflux pipe (5), a mixing pump (6) and a spray water distributor (8), wherein the reflux pump (4) is arranged in the second sludge screening area (104) and the output port is connected to the reflux pipe (5), and the other end of the reflux pipe (5) is connected to the main liquid inlet pipe (7) for feeding the high-load reaction area (101); the mixing pump (6) is installed on the main liquid inlet pipe (7) and distributes the material to the high-load reaction area (101) through the spray water distributor (8); A water diversion weir (3) is centrally disposed in the second sludge screening area (104); the cross-section of the top of the water diversion weir (3) is an isosceles triangle; the liquid outlet of the liquid supply pipe (2) is located directly above the middle position of the water diversion weir (3); and the mud extraction pipe openings (401) of the reflux pump (4) are located on both sides of the middle position of the water diversion weir (3).

2. The steroid drug production wastewater treatment system according to claim 1, characterized in that: It also includes a sludge thickening tank and a filter press. The sludge thickening tank collects the bottom sludge of the activated sludge screening area of ​​the comprehensive oxidation tank, the hydrolysis acidification tank and the flotation sedimentation tank, and the filter press filters and dries the sludge discharged from the sludge thickening tank.

3. A comprehensive oxidation pond, characterized in that: The invention comprises a comprehensive oxidation pond body (1), a conveying pipe and a partition, wherein the inner cavity of the comprehensive oxidation pond body (1) is divided into a high-load reaction zone (101), a low-load aerobic reaction zone (102) and an activated sludge screening zone by a plurality of partitions, and a plurality of conveying pipes are connected between the high-load reaction zone (101), the low-load aerobic reaction zone (102) and the activated sludge screening zone; The activated sludge screening area comprises a sludge screening area 1 (103) and a sludge screening area 2 (104), wherein the sludge screening area 1 (103) and the sludge screening area 2 (104) are separated by the partition, the sludge screening area 1 (103) is connected to the low-load aerobic reaction area (102) through the conveying pipe and is connected to the sludge screening area 2 (104) through the liquid supply pipe (2), and the sludge screening area 2 (104) is output to the hydrolysis acidification tank; It also includes a reflux pump (4), a reflux pipe (5), a mixing pump (6) and a spray water distributor (8), wherein the reflux pump (4) is arranged in the second sludge screening area (104) and the output port is connected to the reflux pipe (5), and the other end of the reflux pipe (5) is connected to the main liquid inlet pipe (7) for feeding the high-load reaction area (101); the mixing pump (6) is installed on the main liquid inlet pipe (7) and distributes the material to the high-load reaction area (101) through the spray water distributor (8); A water diversion weir (3) is centrally disposed in the second sludge screening area (104); the cross-section of the top of the water diversion weir (3) is an isosceles triangle; the liquid outlet of the liquid supply pipe (2) is located directly above the middle position of the water diversion weir (3); and the mud extraction pipe openings (401) of the reflux pump (4) are located on both sides of the middle position of the water diversion weir (3).

4. The comprehensive oxidation pond according to claim 3, characterized in that: The number of the reflux pumps (4) is two and they are respectively located on both sides of the water diversion weir (3); a pump seat (105) is provided on the side wall of the second sludge screening area (104), the reflux pump (4) is installed on the pump seat (105) and the feed port is connected to the sludge extraction pipe port (401) below.

5. The comprehensive oxidation pond according to claim 3, characterized in that: The liquid supply pipe (2) is provided with a valve (201).

6. A comprehensive oxidation pond working method, characterized in that: The integrated oxidation pond described in any one of claims 3 to 5 is used to recycle activated sludge, and a spray water distributor is used to evenly distribute the recovered active sludge liquid to the high-load reaction zone.

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