A method for treating comprehensive wastewater from pharmaceutical production

Abstract

The present invention relates to the technical field of wastewater treatment, and in particular to a method for treating comprehensive wastewater produced in a pharmaceutical factory. The method comprises the following steps: discharging wastewater to be treated into a static tank after passing through a filtering component for static treatment to obtain initial treated water; stratifying the initial treated water that has reached a static treatment time, performing feature detection on the initial treated water of each layer, and recording the detection results; determining static stability characterization parameters of each layer of water according to the detection results of the feature detection, and determining the pollution distribution category of the corresponding layer according to the static stability characterization parameters; determining an evaporation water level line of the static tank according to the pollution distribution category of each layer, and determining a treatment method for the initial treated water after static treatment according to the evaporation water level line and the pollution distribution category; the invention optimizes energy use, improves the efficiency and recovery rate of wastewater treatment, and reduces treatment costs by precisely controlling each link in the wastewater treatment process.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, in particular to a method for treating comprehensive wastewater produced in pharmaceutical factories. Background Art

[0002] Existing technologies for pharmaceutical factory wastewater treatment include physical, chemical, biochemical treatment, membrane separation, and evaporative crystallization. Although these technologies have played a role in pollutant removal, they still have disadvantages such as high cost, unstable treatment efficiency, possible secondary pollution, complex operation, low resource recovery rate, high energy consumption, and difficulty in adapting to strict environmental protection regulations.

[0003] Chinese Patent Publication No.: CN108408877B discloses a pharmaceutical factory pollutant treatment process, including pharmaceutical wastewater entering a biochemical treatment facility, discharging sludge through a sludge discharge device, the sludge entering a sludge concentration and dehydration device for treatment, the dehydrated sludge and solid drug residue entering a drying device together, the drying device carrier gas utilizes the odor generated during the pharmaceutical process, the wet odor discharged from the drying device enters a carrier gas condensation device, the carrier gas condensate enters a biochemical treatment facility, the dried drug residue / sludge at the outlet of the drying device enters an incineration device for incineration treatment, and the unburned ash in the incineration device is discharged through a slag discharge device. The waste gas is discharged into the waste heat boiler to recover the waste heat and generate high-temperature steam. The waste gas enters the flue gas purification facility and discharges fly ash. The purified flue gas is discharged into the atmosphere from the chimney through the induced draft fan. The high-temperature steam generated by the waste heat boiler is used as the heat source for the drying equipment. The odor generated in the pharmaceutical production process and the odor discharged by the carrier gas condensation equipment enter the incineration equipment for incineration and supply combustion-supporting air. It can be seen that the pharmaceutical factory pollutant control process has the following problems: the various treatment processes are independent of each other and cannot be linked, the intermediate products of the treatment process are not utilized, and the treatment process is complicated and time-consuming. Summary of the Invention

[0004] To this end, the present invention provides a method for treating comprehensive wastewater produced in pharmaceutical factories, which is used to overcome the problems in the prior art that the various treatment processes are independent of each other and cannot be linked, the intermediate products of the treatment processes are not utilized, and the treatment processes are complicated and time-consuming.

[0005] To achieve the above object, the present invention provides a method for treating comprehensive wastewater produced in a pharmaceutical factory, comprising:

[0006] The wastewater to be treated is discharged into a settling tank after passing through a filter component to be settling to obtain initial treated water;

[0007] Divide the initial treated water that has reached the static time into layers, perform characteristic tests on the initial treated water in each layer, and record the test results;

[0008] According to the detection results of the characteristic detection, the static stability characterization parameters of each layer of water are determined, and the pollution distribution category of the corresponding layer is determined according to the static stability characterization parameters;

[0009] Determine the evaporation water level of the static pool according to the pollution distribution category of each layer, and determine the treatment method of the initial treated water after static according to the evaporation water level and the pollution distribution category, including:

[0010] The initial treated water after standing is introduced into a distillation container for distillation treatment, the water vapor obtained during the distillation process is passed into a heating pipe to heat the standing pool, and the organic matter content in the water vapor is detected to determine whether the wastewater treatment is qualified;

[0011] Alternatively, the recovered product is determined, the impurities and the initial treated water are separated, the pH value of the initial treated water is adjusted according to the demand for the recovered product, the static tank is heated and concentrated to obtain product crystals, the product crystals are collected and processed to obtain the recovered product, and all the water in the separated impurities is evaporated to obtain solid waste, thereby completing the wastewater treatment.

[0012] Further, the initial treated water that has reached the standing time is layered, including:

[0013] Determining the height of the initial treated water and the thickness of the sediment at the bottom of the stilling tank, and calculating the height difference of the initial treated water level;

[0014] dividing the initial treated water into several layers according to the height difference of the initial treated water;

[0015] The height of the initial treated water reaching the standing time in each layer is the same.

[0016] Furthermore, the characteristic detection of the initial treated water of each layer includes:

[0017] Several samplings were conducted on the initial treatment water of each layer;

[0018] Detect the particle concentration and viscosity of each initial treated water sample and record the test results of each sample;

[0019] Among them, the sampling locations of the initial treated water in each layer are different.

[0020] Furthermore, the static stability characterization parameter is determined according to the detection result of the feature detection, and the static stability characterization parameter is determined according to formula (1),

[0021]

[0022] In formula (1), K is the static stability parameter, n is the total number of samples in the current layer, ci is the particle concentration of the i-th sample, vi is the viscosity of the i-th sample, c0 is the standard particle concentration, and i is an integer greater than 0.

[0023] Furthermore, the pollution distribution category of the corresponding layer is determined according to the static stability characterization parameter, including:

[0024] If the static stability characterization parameter is less than the standard stability characterization parameter, the pollution distribution category of the initial treated water of the current layer is the simple pollution distribution category;

[0025] If the static stability characterization parameter is greater than or equal to the standard stability characterization parameter, the pollution distribution category of the initial treated water of the current layer is a complex pollution distribution category.

[0026] Furthermore, determining the evaporation water level of the static pool includes:

[0027] Determine the initial treated water of the corresponding layer whose pollution distribution category is the simple pollution distribution category;

[0028] The boundary between the initial treated water of the simple pollution category at the bottom and the initial treated water of the complex pollution category is determined as the evaporation water level line.

[0029] Furthermore, the treatment method of the initial treated water after standing is determined according to the evaporation water level and the pollution distribution category, including:

[0030] If the pollution distribution category is a simple pollution distribution category, the treatment method is to introduce the initial treated water after standing into a distillation container for distillation treatment, detect the water vapor obtained in the distillation process, pass it into a heating pipe to heat the standing tank, and detect the organic matter content in the water vapor to determine whether the wastewater treatment is qualified;

[0031] If the pollution distribution category is a complex pollution distribution category, the treatment method is to determine the recovered product, separate the impurities and the initial treated water, adjust the pH value of the initial treated water according to the demand for the recovered product, heat and concentrate the static tank to obtain product crystals, collect the product crystals and process them to obtain the recovered product, evaporate all the water in the separated impurities to obtain solid waste, and complete the wastewater treatment.

[0032] Furthermore, the detection of organic matter content in water vapor to determine whether wastewater treatment is qualified includes:

[0033] If the organic matter content is less than or equal to the standard organic matter content, the wastewater treatment is determined to be qualified;

[0034] If the organic matter content is greater than the standard organic matter content, the wastewater treatment is determined to be unqualified.

[0035] Further, separating the precipitate and the initial treated water comprises:

[0036] Adding a precipitant into the static tank to precipitate impurities in the initially treated water;

[0037] The settled impurities are discharged from the bottom of the static tank, and the discharge is stopped when the discharge volume reaches the preset separation volume;

[0038] The preset separation volume is determined according to the thickness of the bottom sediment after settling.

[0039] Furthermore, the method further includes recovering the water vapor produced during the initial water treatment process.

[0040] Compared with the existing technology, the beneficial effect of the present invention lies in that by dividing the initial treated water into several layers and sampling and testing them separately, the characteristics of each layer in the wastewater are comprehensively evaluated, providing data support for the optimization of subsequent treatment processes; according to the pollution distribution categories of different layers, targeted treatment plans are designed to achieve effective treatment of wastewater and resource recovery; wastewater with simple pollution distribution categories is treated by distillation, while wastewater with complex pollution distribution categories is treated by heating concentration, crystallization recovery and separation of solid waste, which improves energy utilization and reduces treatment costs. In addition, the recovery and reuse of water vapor further improves treatment efficiency and saves costs; the present invention optimizes energy use, improves wastewater treatment efficiency and recovery rate, and reduces treatment costs by precisely controlling each link in the wastewater treatment process, thereby achieving a dual improvement in environmental protection and economic benefits.

[0041] Furthermore, the initial treated water is divided into several layers, and sampling and testing are carried out separately; the characteristics of each layer in the wastewater can be comprehensively evaluated, and treatment plans can be designed in a targeted manner to provide data support for the optimization of subsequent treatment processes. In addition, sampling at different locations can more accurately reflect the performance of the entire wastewater treatment system and avoid deviations from local samples.

[0042] Furthermore, considering that the wastewater to be treated contains multiple components, standing can carry out preliminary treatment of pollutants in the water. Solid particles, suspended matter and colloidal sediments in the wastewater can sink to the bottom or lower layer of the standing tank. At this time, the treatment process of the upper clear liquid is relatively simple and can be directly treated and recycled. Therefore, the standing stability characterization parameters of each layer of water in the standing tank are calculated to characterize the impurity content of the wastewater after standing, and then provide data support for the subsequent classification of pollution distribution categories in the water, so as to facilitate the subsequent selection of adaptive treatment methods for various types of wastewater, directly treat wastewater with simple impurities, and use energy and products in the treatment process for the treatment of complex wastewater with impurities, saving treatment costs while improving wastewater treatment efficiency.

[0043] Furthermore, the water vapor obtained in the treatment process of wastewater with simple pollution distribution category is used to heat the static tank to provide conditions for obtaining recycled products, thereby reducing the wastewater treatment cost, improving the energy utilization rate of the wastewater treatment process, and reducing the treatment time.

[0044] Furthermore, in the present invention, the water vapor generated in the process of extracting and recovering the product is recovered, which further improves the recovery rate of the treated wastewater and saves the recovery cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a flow chart of a method for treating comprehensive wastewater produced in a pharmaceutical factory according to an embodiment of the present invention;

[0046] Figure 2 A logic diagram for determining the pollution distribution category of the corresponding layer for an embodiment of the present invention;

[0047] Figure 3 A flow chart for determining the evaporation water level of the static pool according to an embodiment of the present invention;

[0048] Figure 4 This is a logic diagram for determining whether wastewater treatment is qualified according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0050] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0051] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0052] See also Figure 1 As shown, it is a flow chart of a method for treating comprehensive wastewater produced in a pharmaceutical factory according to an embodiment of the present invention; the present invention provides a method for treating comprehensive wastewater produced in a pharmaceutical factory, comprising:

[0053] The wastewater to be treated is discharged into a settling tank after passing through a filter component to be settling to obtain initial treated water;

[0054] Divide the initial treated water that has reached the static time into layers, perform characteristic tests on the initial treated water in each layer, and record the test results;

[0055] According to the detection results of the characteristic detection, the static stability characterization parameters of each layer of water are determined, and the pollution distribution category of the corresponding layer is determined according to the static stability characterization parameters;

[0056] Determine the evaporation water level of the static pool according to the pollution distribution category of each layer, and determine the treatment method of the initial treated water after static according to the evaporation water level and the pollution distribution category, including:

[0057] The initial treated water after standing is introduced into a distillation container for distillation treatment, the water vapor obtained during the distillation process is passed into a heating pipe to heat the standing pool, and the organic matter content in the water vapor is detected to determine whether the wastewater treatment is qualified;

[0058] Alternatively, the recovered product is determined, the impurities and the initial treated water are separated, the pH value of the initial treated water is adjusted according to the demand for the recovered product, the static tank is heated and concentrated to obtain product crystals, the product crystals are collected and processed to obtain the recovered product, and all the water in the separated impurities is evaporated to obtain solid waste, thereby completing the wastewater treatment.

[0059] In practice, the filter component can be a replaceable filter screen that filters larger impurities in the water, such as garbage production, waste, etc.

[0060] The composition of pharmaceutical factory wastewater is complex, and after standing, the following layers may appear: upper floating oil layer: pharmaceutical factory wastewater may contain oily substances, which have a low density and will float on the water surface to form a layer of oil film; upper clear liquid layer: soluble substances and smaller particulate matter in the wastewater will be distributed in the upper layer, forming a relatively clear liquid layer; middle layer: suspended particles and some colloidal substances in the wastewater are formed in the middle layer, which is relatively turbid compared to the upper clear liquid; lower sedimentation layer: heavy particulate matter and sediment in the wastewater will settle to the bottom, forming a sedimentation layer, which includes heavy metals, precipitated organic matter, insoluble salts, etc.

[0061] In addition, in some cases, colloidal particles in wastewater may aggregate together through flocculation to form flocs, which are usually distributed in the middle layer.

[0062] The upper layer of floating oil can be processed by an oil collector, such as a belt-type floating oil collector or an oil scraper. The floating oil collector can automatically collect and remove the grease floating on the water surface. This is existing technology and will not be described in detail.

[0063] By dividing the initial treated water into several layers and sampling and testing them separately, the characteristics of each layer in the wastewater are comprehensively evaluated to provide data support for the optimization of subsequent treatment processes; according to the pollution distribution categories of different layers, treatment plans are designed in a targeted manner to achieve effective treatment of wastewater and resource recovery; wastewater with simple pollution distribution categories is treated by distillation, while wastewater with complex pollution distribution categories is treated by heating concentration, crystallization recovery and separation of solid waste, which improves energy utilization and reduces treatment costs. In addition, the recovery and reuse of water vapor further improves treatment efficiency and saves costs; the present invention optimizes energy use, improves wastewater treatment efficiency and recovery rate, and reduces treatment costs by precisely controlling each link in the wastewater treatment process, thereby achieving a dual improvement in environmental protection and economic benefits.

[0064] Specifically, the initial treated water having reached the standing time is divided into layers, comprising:

[0065] Determining the height of the initial treated water and the thickness of the sediment at the bottom of the stilling tank, and calculating the height difference of the initial treated water level;

[0066] dividing the initial treated water into several layers according to the height difference of the initial treated water;

[0067] The height of the initial treated water reaching the standing time in each layer is the same.

[0068] In practice, the standing time is 4 hours, and the thickness of the bottom sediment is determined from the bottom of the standing tank to the junction of the lower sediment layer and the middle layer.

[0069] The total number of layers of the initially treated water is 5 to 10 layers, preferably 7 layers.

[0070] Specifically, the characteristic detection of the initial treated water of each layer includes:

[0071] Several samplings were conducted on the initial treatment water of each layer;

[0072] Detect the particle concentration and viscosity of each initial treated water sample and record the test results of each sample;

[0073] Among them, the sampling locations of the initial treated water in each layer are different.

[0074] In practice, the number of sampling of the initial water in the interlayer is not less than 3, preferably 5 times;

[0075] It is understandable that the initial treated water is divided into several layers and sampled and tested separately; it can comprehensively evaluate the characteristics of each layer in the wastewater, design targeted treatment plans, and provide data support for the optimization of subsequent treatment processes. In addition, sampling at different locations can more accurately reflect the performance of the entire wastewater treatment system and avoid the deviation of local samples.

[0076] The particle concentration can be obtained by a counter or filtration method. The filtration method is to capture the particles in the sample by passing the sample through a pre-weighed filter membrane or filter paper. After filtration, the particles on the filter membrane are dried and weighed to calculate the mass concentration of the particles.

[0077] Particle counters or laser particle size analyzers can be used as counters. Particle counters estimate particle mass concentration by measuring the number and size of particles in a sample. Common particle counters include light scattering and laser scattering types. They measure the degree of light scattering by particles, thereby inferring particle size and number. Laser particle size analyzers pass a laser beam through the sample and measure the scattering and diffraction patterns of the laser light. By analyzing these optical signals, the device can determine the particle size distribution and concentration. Combined with the particle density information, the mass concentration can be estimated.

[0078] The viscosity can be measured by any one of a rotational viscometer, a capillary viscometer or a vibration viscometer, which is the existing technology and will not be described in detail.

[0079] See also Figure 2 As shown, it is a logic diagram for determining the pollution distribution category of the corresponding layer according to an embodiment of the present invention. The static stability characterization parameter is determined according to the detection result of the feature detection. The static stability characterization parameter is determined according to formula (1).

[0080]

[0081] In formula (1), K is the static stability parameter, n is the total number of samples in the current layer, ci is the particle concentration of the i-th sample, vi is the viscosity of the i-th sample, c0 is the standard particle concentration, and i is an integer greater than 0.

[0082] In practice, the standard particle concentration is 100 mg / L and the standard viscosity v0 is 10 cP.

[0083] It is understood that for the supernatant, the concentration of particulate matter is generally low, usually between 1 and 100 mg / L. These liquids have undergone preliminary sedimentation or other treatments, and the content of particulate matter is relatively low. The viscosity of the supernatant is usually close to that of water, about 1 to 10 cP.

[0084] For the middle layer, the concentration of particulate matter is relatively high, usually between 100 and 1000 mg / L. This layer usually contains smaller particles and suspended matter, which cannot be completely settled in a short time; the viscosity of the middle layer is higher, but generally between 10 and 100 cP, depending on the concentration and properties of the suspended matter and flocs contained in the middle layer; for the lower sedimentation layer, the concentration of precipitated particulate matter is very high, usually exceeding 1000 mg / L, and may reach several thousand to tens of thousands of mg / L, depending on the concentration of the sediment and the type of sediment. The viscosity of the sedimentation layer is relatively high, which may reach 100 to 10,000 cP or even higher, depending on the content and properties of the sediment; the sediment usually forms a mud-like state.

[0085] Specifically, the pollution distribution category of the corresponding layer is determined according to the static stability characterization parameter, including:

[0086] If the static stability characterization parameter is less than the standard stability characterization parameter, the pollution distribution category of the initial treated water of the current layer is the simple pollution distribution category;

[0087] If the static stability characterization parameter is greater than or equal to the standard stability characterization parameter, the pollution distribution category of the initial treated water of the current layer is a complex pollution distribution category.

[0088] In the implementation, the standard stability characterization parameters are selected in the interval [0.8,1.2].

[0089] In the present invention, considering that the wastewater to be treated contains multiple components, standing can perform preliminary treatment of pollutants in the water, and solid particles, suspended matter and colloidal precipitates in the wastewater can sink to the bottom or lower layer of the standing tank. At this time, the treatment process of the upper clear liquid is relatively simple and can be directly treated and recovered. Therefore, the standing stability characterization parameters of each layer of water in the standing tank are calculated to characterize the impurity content of the wastewater after standing, and then provide data support for the subsequent classification of pollution distribution categories in the water, which is convenient for the subsequent selection of adaptive treatment methods for various types of wastewater, and directly treat the wastewater with simple impurities. In the treatment process, energy and products are used for the treatment process of the wastewater with complex impurities, which saves treatment costs while improving wastewater treatment efficiency.

[0090] See also Figure 3 As shown, it is a flow chart of determining the evaporation water level line of the static pool according to an embodiment of the present invention. Determining the evaporation water level line of the static pool includes:

[0091] Determine the initial treated water of the corresponding layer whose pollution distribution category is the simple pollution distribution category;

[0092] The boundary between the initial treated water of the simple pollution category at the bottom and the initial treated water of the complex pollution category is determined as the evaporation water level line.

[0093] During implementation, if there is no initial treated water with a simple pollution distribution category, or the initial treated water with a simple pollution distribution category contains too few layers, the standing time is increased and the standing stability characterization parameters are recalculated according to the pollution distribution category of the corresponding layers until more than half of the layers of initial treated water are of the simple pollution distribution category, and the evaporation water level is determined.

[0094] It is understandable that water with less impurities can be directly evaporated to avoid the need to carry out a large amount of impurity removal process on the entire wastewater, which would lead to complicated or difficult operations.

[0095] Specifically, the treatment method for the initial treated water after standing is determined according to the evaporation water level and pollution distribution category, including:

[0096] If the pollution distribution category is a simple pollution distribution category, the treatment method is to introduce the initial treated water after standing into a distillation container for distillation treatment, detect the water vapor obtained in the distillation process, pass it into a heating pipe to heat the standing tank, and detect the organic matter content in the water vapor to determine whether the wastewater treatment is qualified;

[0097] If the pollution distribution category is a complex pollution distribution category, the treatment method is to determine the recovered product, separate the impurities and the initial treated water, adjust the pH value of the initial treated water according to the demand for the recovered product, heat and concentrate the static tank to obtain product crystals, collect the product crystals and process them to obtain the recovered product, evaporate all the water in the separated impurities to obtain solid waste, and complete the wastewater treatment.

[0098] In the present invention, the water vapor obtained in the treatment process of wastewater with simple pollution distribution category is used to heat the static tank to provide conditions for obtaining recovered products, thereby reducing the wastewater treatment cost, improving the energy utilization rate of the wastewater treatment process, and reducing the treatment time.

[0099] It is understandable that in order to fully utilize the heat in the water vapor, the initial treated water responsible for the pollution distribution category needs to be separated from the sediment and then heated with water vapor.

[0100] See also Figure 4 As shown, it is a logic diagram for judging whether wastewater treatment is qualified. The detection of organic matter content in water vapor to judge whether wastewater treatment is qualified includes:

[0101] If the organic matter content is less than or equal to the standard organic matter content, the wastewater treatment is determined to be qualified;

[0102] If the organic matter content is greater than the standard organic matter content, the wastewater treatment is determined to be unqualified.

[0103] In practice, the standard organic matter content is 50mg / m 3, organic matter is usually VOCs, and the detection method can be directly obtained through a VOCs concentration detector.

[0104] The wastewater remaining after evaporation is classified as the next wastewater to be treated and is temporarily stored. This is because the concentration of various ions or solutes in the wastewater after evaporation increases and cannot be discharged directly. In addition, this part of the wastewater contains solutes that can be reused. Therefore, temporary storage followed by treatment can save production costs for pharmaceutical factories.

[0105] Specifically, separating the impurities from the initial treated water includes,

[0106] Adding a precipitant into the static tank to precipitate impurities in the initially treated water;

[0107] The settled impurities are discharged from the bottom of the static tank, and the discharge is stopped when the discharge volume reaches the preset separation volume;

[0108] The preset separation volume is determined according to the thickness of the bottom sediment after settling, and the impurities include lower sediment, suspended particles and colloidal substances.

[0109] In practice, the precipitant is a flocculant, which may be an inorganic flocculant, such as polyaluminium chloride (PAC), aluminium sulfate, or an organic flocculant, such as polyacrylamide (PAM), which is a prior art and is not specifically limited;

[0110] The preset separation volume is 1.1 times the volume corresponding to the thickness of the bottom sediment after sedimentation.

[0111] The types of recovered products include ammonium sulfate and ammonium chloride. When the recovered product is determined to be ammonium sulfate, the pH value is adjusted to 5.5-6.5. When the recovered product is determined to be ammonium chloride, the pH value is adjusted to 6.5-7.5.

[0112] When determining the type of recovered product, it is determined based on the sulfate ion concentration and chloride ion concentration in the wastewater. If the sulfate ion concentration is greater than or equal to the chloride ion concentration, the recovered product is determined to be ammonium sulfate. If the sulfate ion concentration is less than the chloride ion concentration, the recovered product is determined to be ammonium chloride.

[0113] Determine whether the recovered products from the evaporated wastewater remaining in the previous wastewater treatment process are the same as the recovered products from the current treatment process. If they are the same, add the evaporated wastewater remaining in the wastewater treatment process to the static tank for simultaneous treatment. If they are different, continue to store them.

[0114] The process of obtaining product crystallization includes heating the static tank with water vapor to concentrate the initial treated water and increase the ammonium salt concentration. As the water content decreases and the concentration becomes saturated, crystallization begins. When the ammonia concentration is less than 0.1 g / L, the product crystallization is determined to be complete and heating is stopped.

[0115] The process of treating the product crystals to obtain a recovered product includes centrifuging the crystals and the remaining wastewater, separating the remaining impurities from the product crystals and filtering to obtain initial crystals, and then washing and drying the initial crystals to obtain a recovered product. This is a prior art and the operation process is not specifically limited.

[0116] Specifically, the wastewater treatment method further includes step S5, which is to recover the water vapor in the initial treatment water treatment process.

[0117] In the present invention, the water vapor generated in the process of extracting and recovering the product is recovered, which further improves the recovery rate of the treated wastewater and saves the recovery cost.

[0118] If the pharmaceutical factory production comprehensive wastewater treatment method of the present invention is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0119] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

[0120] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for treating comprehensive wastewater from pharmaceutical factories, characterized in that: include: The wastewater to be treated is discharged into a settling tank after passing through a filter component to be settling to obtain initial treated water; The initial treated water that has reached the static time is divided into layers, and characteristic tests are performed on the initial treated water of each layer, the particle concentration and viscosity of each initial treated water sample are tested, and the test results are recorded; According to the detection results of the characteristic detection, the static stability characterization parameters of each layer of water are determined, and the pollution distribution category of the corresponding layer is determined according to the static stability characterization parameters. If the static stability characterization parameter is less than the standard stability characterization parameter, the pollution distribution category of the initial treated water of the current layer is a simple pollution distribution category; if the static stability characterization parameter is greater than or equal to the standard stability characterization parameter, the pollution distribution category of the initial treated water of the current layer is a complex pollution distribution category. The static stability characterization parameter is determined according to formula (1). ， In formula (1), K is the static stability parameter, n is the total number of samples in the current layer, ci is the particle concentration of the i-th sample, vi is the viscosity of the i-th sample, c0 is the standard particle concentration, v0 is the standard viscosity, and i is an integer greater than 0; According to the pollution distribution category of each layer, the boundary between the initial treated water of the simple pollution category and the initial treated water of the complex pollution category at the bottom is determined as the evaporation water level line of the static pool. If there is no initial treated water of the simple pollution distribution category, or the initial treated water of the simple pollution distribution category contains too few layers, then the static stability characterization parameter is recalculated according to the pollution distribution category of the corresponding layer until the initial treated water of more than half of the layers is of the simple pollution distribution category, and then the evaporation water level line is determined; The treatment method for the initial treated water after standing is determined according to the evaporation water level and pollution distribution category, including: The initial treated water, which is determined to be a simple pollution distribution category after standing still, is introduced into a distillation container for distillation treatment, the water vapor obtained during the distillation process is tested and passed into a heating pipe to heat the standing tank, and the organic matter content in the water vapor is tested to determine whether the wastewater treatment is qualified; Alternatively, for the wastewater recovery product whose pollution distribution category is determined to be a complex pollution distribution category after standing, the impurities and the initial treatment water are separated, the pH value of the initial treatment water is adjusted according to the demand for the recovered product, the standing tank is heated and concentrated to obtain product crystals, the product crystals are collected and processed to obtain a recovered product, and all the water in the separated impurities is evaporated to obtain solid waste, thereby completing the wastewater treatment.

2. The method for treating comprehensive wastewater from pharmaceutical production according to claim 1, characterized in that: The initial treated water having reached the standing time is separated into layers, include, Determining the height of the initial treated water and the thickness of the sediment at the bottom of the standing tank, and calculating the height difference of the initial treated water level; Dividing the initial treatment water into several layers according to the height difference of the initial treatment water level; The height of the initial treated water reaching the standing time in each layer is the same.

3. The method for treating comprehensive wastewater from pharmaceutical production according to claim 2, characterized in that: The characteristic detection of the initial treated water of each layer includes: Several samplings were conducted on the initial treatment water of each layer; Detect the particle concentration and viscosity of each initial treated water sample and record the test results of each sample; Among them, the sampling locations of the initial treated water in each layer are different.

4. The method for treating comprehensive wastewater from pharmaceutical production according to claim 3, characterized in that: The detection of organic matter content in water vapor to determine whether wastewater treatment is qualified includes: If the organic matter content is less than or equal to the standard organic matter content, the wastewater treatment is determined to be qualified; If the organic matter content is greater than the standard organic matter content, the wastewater treatment is determined to be unqualified.

5. The method for treating comprehensive wastewater from pharmaceutical production according to claim 4, characterized in that: Separating the impurities from the initial treated water comprises, Adding a precipitant into the static tank to precipitate impurities in the initially treated water; The settled impurities are discharged from the bottom of the static tank, and the discharge is stopped when the discharge volume reaches the preset separation volume; The preset separation volume is determined according to the thickness of the bottom sediment after settling.

6. The method for treating comprehensive wastewater from pharmaceutical production according to claim 5, characterized in that: It also includes recovering the water vapor produced during the initial water treatment process.

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