Sintering machine head ash treatment system and method for treating waste water based on medical waste steam method

Abstract

The invention discloses a sintering machine head ash treatment system and method for treating waste water based on a medical waste steam method. The sintering machine head ash treatment method for treating the waste water based on the medical waste steam method comprises the following steps: S1, washing and filtering sintering machine head ash; s2, heavy metal and impurity removal treatment is conducted on the solution discharged after washing and filtering treatment, and heavy metal ions dissolved in the washing process are removed; s3, carrying out denitrification treatment on the solution discharged after heavy metal removal and impurity removal treatment, oxidizing NH3 into N2 and H2O through sodium hypochlorite, removing NH3 and generating NaCl; s4, the solution discharged after denitrification treatment is subjected to decoloration treatment; s5, carrying out evaporation salt extraction treatment on the solution discharged after the decoloration treatment; when waste water generated by medical waste high-temperature steam treatment is treated, ammonia in the sintering machine head ash washing process is removed at the same time, corrosion of strong brine to a triple-effect evaporator is prevented, and effective treatment of the two kinds of waste is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of solid waste utilization, and in particular to a sintering machine head ash treatment system and method for treating wastewater based on a medical waste steam method. Background Art

[0002] Sintering machine head ash is the dust collected by the electrostatic precipitator during the sintering process of the steel plant. It contains a certain amount of iron, but also has a high content of potassium, sodium and chlorine. The typical 4# electric field sintering machine head ash is mainly composed of TFe (total iron), CaO (calcium oxide), SiO2 (silicon dioxide), ZnO (zinc oxide), K2O (potassium oxide), Na2O (sodium oxide), chlorine, sulfur, PbO (lead oxide) and CuO (copper oxide). If the sintering machine head ash is directly returned to the steel plant for sintering and reuse, alkali metals such as potassium and sodium and Cl elements will accumulate during the sintering process, causing hazards such as increased sintering energy consumption, grate blockage and blast furnace nodules.

[0003] Publication No. CN115231753B provides a method for treating sintering machine head ash by using membrane concentrated brine, the method comprising the following steps: a. introducing membrane concentrated brine into a pH adjustment tank for pH adjustment treatment so that the pH value of the liquid in the pH adjustment tank is around 8; b. introducing the liquid after the pH adjustment treatment in step a into a first deammoniation treatment process for a first deammoniation treatment; c. introducing the liquid after the first deammoniation treatment in step b into an ash washing unit for washing the sintering machine head ash to obtain a water washing stock solution; d. performing a first solid-liquid separation treatment on the water washing stock solution in step c to obtain a water washing liquid; e. introducing part of the water washing liquid discharged after the treatment in step d into the pH adjustment tank of step a, and repeating steps ad; introducing the remaining water washing liquid in step d into a subsequent treatment process for processing to form a by-product.

[0004] At present, the treatment of sintering machine head ash mostly adopts the method of water washing-separation-weight removal-impurity removal-bleaching-evaporation to remove the above elements and recover KCl (potassium chloride) and NaCl (sodium chloride) for resource recycling. However, due to the presence of Mg3N2 (magnesium nitride) in the sintering machine head ash, NH3 will be generated during the water washing and leaching process and dissolved in water to form ammonia water. After weight removal, impurity removal and bleaching, ammonium chloride will be formed in the evaporation and salt extraction stage. If this process is not properly controlled, the pH value of the mother liquor may be reduced, thereby corroding the equipment and adversely affecting the purity of the products KCl (potassium chloride) and NaCl (sodium chloride). Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose a sintering machine head ash treatment system and method for treating wastewater based on the medical waste steam method, so as to solve the technical problem that the ammonia water generated during the water washing of the sintering machine head ash in the prior art will form ammonium chloride in the evaporation and salt extraction stage, which may reduce the pH value of the mother liquor, corrode the equipment, and affect the purity of KCl and NaCl.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a sintering machine head ash treatment system for treating wastewater based on a medical waste steam method, comprising: the sintering machine head ash treatment subsystem comprises a water washing and filtering device, a weight removal and impurity removal device and a denitrification device connected in sequence, for sequentially performing water washing and filtering treatment, weight removal and impurity removal treatment and denitrification treatment on solid waste; the medical waste steam method wastewater pretreatment subsystem is connected to the denitrification device, for delivering the medical waste steam method wastewater containing NaClO into the denitrification device.

[0007] In some embodiments, the sintering machine head ash disposal subsystem also includes a decolorization device and an evaporation salt extraction device, which are used to sequentially decolorize and evaporate the solution produced by the denitrification device; the medical waste steam treatment wastewater pretreatment subsystem includes a disinfection device and a grid filter device, which is used to disinfect the medical waste steam treatment wastewater to eliminate pathogenic microorganisms in the wastewater; the grid filter device is used to filter and remove large particles in the wastewater.

[0008] In a second aspect, the present invention further provides a method for treating sintering machine head ash by treating wastewater based on a medical waste steam method, comprising a sintering machine head ash treatment system for treating wastewater based on a medical waste steam method as described above, and further comprising the following steps: S1: Wash and filter the sintering machine head ash to dissolve the elements that can be recycled into water and filter and separate the iron salts that are insoluble in water; S2: performing a de-heavy and de-impurity treatment on the solution discharged after the water washing and filtering treatment to remove the heavy metal ions dissolved in the water washing process; S3: Denitrification treatment is performed on the solution discharged after the heavy and impurity removal treatment, and the medical waste steam treatment wastewater containing NaClO is introduced into the system, mixed with the head ash water washing filtrate according to a preset ratio, and chemically reacts with NH3 in the head ash water washing filtrate, oxidizing NH3 into N2 and H2O through sodium hypochlorite, removing NH3 and generating NaCl; S4: Decolorizing the solution discharged after denitrification treatment, using activated carbon to adsorb organic impurities in the solution to improve the quality of NaCl and KCl; S5: The solution discharged after the decolorization treatment is subjected to evaporation and salt extraction treatment, and NaCl and KCl are separated by evaporation and concentration method by utilizing the difference in solubility of NaCl and KCl at different temperatures.

[0009] In some embodiments, the recyclable elements include potassium, sodium and chlorine.

[0010] In some embodiments, a pH value detection device is provided in a mixing container of wastewater and sintering machine head ash water washing filtrate, and the mixing ratio of wastewater and sintering machine head ash water washing filtrate is controlled by real-time monitoring of the pH value.

[0011] In some embodiments, in step S5, the evaporation temperature of the evaporation salt extraction process is controlled within the temperature range where the solubility difference between NaCl and KCl is the largest, which is 60°C-100°C.

[0012] In some embodiments, the medical waste steam treatment wastewater is also disinfected before being introduced into the system to eliminate pathogenic microorganisms in the wastewater.

[0013] In some embodiments, the disinfection treatment eliminates pathogenic microorganisms present in the wastewater, including bacteria, viruses and fungi, by adding NaClO to the wastewater.

[0014] In some embodiments, the amount of NaClO added is set to 1.5-2 times the theoretically calculated amount.

[0015] In some embodiments, the medical waste steam treatment wastewater is subjected to a grid filtration treatment after being disinfected to remove large particle impurities and suspended matter in the wastewater.

[0016] Compared with the prior art, the sintering machine head ash treatment system and method based on the medical waste steam method for treating wastewater provided by the present invention utilizes the production wastewater of the medical waste high-temperature steam treatment to coordinately treat the sintering machine head ash, so that the excess NaClO in the wastewater can be used to react chemically with NH3 in the machine head ash washing filtrate, and the reaction formula is: 3NaClO+2NH3→N2↑+3NaCl+3H2O, and NH3 can be removed and NaCl can be generated through the oxidation-reduction reaction, so that the solution can not only solve the production wastewater in the medical waste high-temperature steam treatment process, but also remove ammonia in the sintering machine head ash washing process, thereby avoiding the corrosion of the triple-effect evaporator by concentrated brine in the later stage, and realizing the effective treatment of the two wastes; This scheme introduces the production wastewater of medical waste high-temperature steam treatment into the deammoniation treatment process. By adding NaClO after removing weight and impurities, it can prevent NaClO from reacting with Cr in water-soluble substances in the subsequent treatment process. 3+ (trivalent chromium) undergoes oxidation reaction, thereby avoiding the formation of Cr6+ (Hexavalent chromium). Hexavalent chromium is a substance that is highly toxic to humans and the environment. Therefore, the treatment process of this solution can effectively prevent the increase of chromium toxicity and ensure the safety and environmental protection of the treatment process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic flow chart of a sintering machine head ash treatment method for treating wastewater based on a medical waste steam method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] In order to solve the technical problem that the ammonia water generated during the water washing of sintering machine head ash will form ammonium chloride in the evaporation and salt extraction stage, which may reduce the pH value of the mother liquor, corrode equipment, and affect the purity of KCl and NaCl, the present invention provides a sintering machine head ash treatment system and method for treating wastewater based on a medical waste steam method. While solving the problem of producing wastewater in the process of high-temperature steam treatment of medical waste, ammonia in the water washing process of sintering machine head ash can also be removed, thereby avoiding the corrosion of the triple-effect evaporator by concentrated brine in the later stage, and realizing the effective treatment of two kinds of wastes.

[0020] In a first aspect, an embodiment of the present invention provides a sintering machine head ash treatment system for treating wastewater based on a medical waste steam method, comprising: a sintering machine head ash treatment subsystem and a medical waste steam method wastewater pretreatment subsystem, the sintering machine head ash treatment subsystem comprising a water washing and filtering device, a weight removal and impurity removal device, a denitrification device, a decolorization device and an evaporation and salt extraction device connected in sequence, for sequentially performing water washing and filtering treatments, weight removal and impurity removal treatments, denitrification treatments, decolorization treatments and evaporation and salt extraction treatments on solid waste; the medical waste steam method wastewater pretreatment subsystem is connected to the denitrification device, and is used to send medical waste steam method wastewater containing NaClO into the denitrification device.

[0021] In this scheme, a sintering machine head ash disposal subsystem and a medical waste steam treatment wastewater pretreatment subsystem are provided. The sintering machine head ash disposal subsystem includes a water washing and filtering device, a weight removal and impurity removal device, a denitrification device, a decolorization device and an evaporation and salt extraction device which are connected in sequence. The water washing and filtering device, the weight removal and impurity removal device, the denitrification device, the decolorization device and the evaporation and salt extraction device can be used to sequentially carry out water washing and filtering treatment, weight removal and impurity removal treatment, denitrification treatment, decolorization treatment and evaporation and salt extraction treatment on the solid waste, and the medical waste steam treatment wastewater containing NaClO is sent to the denitrification device by using the medical waste steam treatment wastewater pretreatment subsystem. The sintering machine head ash is synergistically treated by using the production wastewater of the medical waste high-temperature steam treatment, so that the excess NaClO in the wastewater can be used to react chemically with NH3 in the machine head ash water washing filtrate, so that NH3 can be removed and NaCl can be generated, so as to prevent the concentrated brine from corroding the triple-effect evaporator in the later stage.

[0022] It should be noted that in this solution, the solid waste includes but is not limited to sintering machine head ash. The present invention is also applicable to other types of solid waste, and the application principles are essentially the same, so they will not be described in detail.

[0023] Specifically, after the wastewater treated by steam treatment of medical waste is mixed with the head ash washing filtrate, the chemical reaction formula of the chemical reaction between NaClO in the wastewater and NH3 in the head ash washing filtrate is: 3NaClO+2NH3→N2↑+3NaCl+3H2O, which indicates that under certain conditions, sodium hypochlorite (NaClO) reacts with ammonia (NH3) to generate nitrogen (N2), sodium chloride (NaCl) and water (H2O). This reaction is a redox reaction, in which sodium hypochlorite is reduced to sodium chloride and ammonia is oxidized to generate nitrogen, thereby removing NH3 and generating NaCl.

[0024] It should be noted that high-temperature steam treatment is an effective means for treating infectious and damaging medical waste. It removes pathogenic microorganisms in medical waste through steam at ≥135°C, gauge pressure ≥220kPa, and residence time of more than 45 minutes, eliminating the hazardous characteristics of medical waste. Among them, production wastewater mainly comes from the washing wastewater of transfer vehicles and turnover boxes, the washing wastewater of temporary storage places and cold storage rooms at unloading sites, and the waste liquid discharged during the high-temperature steam treatment process. Its notable characteristics are that the chemical oxygen demand (COD), biochemical oxygen demand (BOD) and suspended solids content are relatively low, but the number of fecal coliform bacteria is high (mainly containing bacteria and viruses). In order to effectively eliminate fecal coliform bacteria, excessive NaClO (sodium hypochlorite) is usually used for disinfection to ensure thorough disinfection. By increasing the dosage of NaClO, it can ensure that sufficient free chlorine concentration is achieved even in the presence of organic matter or other interfering factors, thereby eliminating all target microorganisms. However, excessive NaClO (sodium hypochlorite) will affect the activity of bacterial colonies in biochemical sludge in subsequent sewage treatment, thus affecting the sewage treatment effect.

[0025] This scheme uses the production wastewater from the high-temperature steam treatment of medical waste to coordinately treat the sintering machine head ash. It can not only remove the ammonia in the sintering machine head ash washing filtrate and avoid the corrosion of the triple-effect evaporator by concentrated brine in the later stage, but also make full use of the excess NaClO (sodium hypochlorite) after the wastewater is treated by the medical waste steam method wastewater pretreatment subsystem, solve the sewage treatment problem caused by excessive NaClO, and realize the effective treatment of the two wastes.

[0026] In order to achieve pretreatment of production wastewater from high-temperature steam treatment of medical waste, in this embodiment, the medical waste steam treatment wastewater pretreatment subsystem includes a disinfection device and a grid filter device. The disinfection device is used to disinfect the medical waste steam treatment wastewater to eliminate pathogenic microorganisms in the wastewater. Specifically, an appropriate amount of sodium hypochlorite solution is added to the wastewater. Sodium hypochlorite is a strong oxidant that can effectively kill or inactivate various pathogenic microorganisms, including bacteria, viruses, fungi, etc.; the grid filter device is used to filter and remove large particles in the wastewater. After disinfection, the wastewater passes through one or more grids, which can intercept larger solid waste, such as plastic fragments, cloth, paper, etc. The intercepted solid waste is collected and further processed or disposed of, which can protect subsequent processing equipment from blockage and damage, reduce the load in the subsequent processing process, and improve the processing efficiency.

[0027] See also Figure 1In a second aspect, an embodiment of the present invention further provides a sintering machine head ash treatment method for treating wastewater based on a medical waste steam method, comprising a sintering machine head ash treatment system for treating wastewater based on a medical waste steam method as described in any of the above embodiments, wherein the sintering machine head ash treatment method for treating wastewater based on a medical waste steam method further comprises the following steps: S1: Wash and filter the sintering machine head ash to dissolve the elements that can be recycled into water and filter and separate the iron salts that are insoluble in water; S2: performing a de-heavy and de-impurity treatment on the solution discharged after the water washing and filtering treatment to remove the heavy metal ions dissolved in the water washing process; S3: Denitrification treatment is performed on the solution discharged after the heavy and impurity removal treatment, and the medical waste steam treatment wastewater containing NaClO is introduced into the system, mixed with the head ash water washing filtrate according to a preset ratio, and chemically reacts with NH3 in the head ash water washing filtrate, oxidizing NH3 into N2 and H2O through sodium hypochlorite, removing NH3 and generating NaCl; S4: Decolorizing the solution discharged after denitrification treatment, using activated carbon to adsorb organic impurities in the solution to improve the quality of NaCl and KCl; S5: The solution discharged after the decolorization treatment is subjected to evaporation and salt extraction treatment, and NaCl and KCl are separated by evaporation and concentration method by utilizing the difference in solubility of NaCl and KCl at different temperatures.

[0028] In this scheme, the sintering machine head ash is sent to the sintering machine head ash disposal subsystem, and is sequentially treated by water washing and filtration, de-weighting and impurity removal, deammoniation, decolorization and evaporation and salt extraction. Specifically, the sintering machine head ash enters the water washing and filtration device for water washing and filtration treatment, and the sintering machine head ash is mixed with clean water. The potassium, sodium and chlorine elements in the sintering machine head ash exist in the form of soluble salts. The above-mentioned potassium, sodium and chlorine elements that can be recycled are dissolved by stirring. Subsequently, the insoluble iron salts and other solid impurities are separated by the filtering structure. During the water washing process, part of the magnesium nitride will react with water to generate NH3, which will dissolve in the water. At the same time, heavy metal ions such as Cu / Cr / Zn are dissolved in the water. The water washing solution then enters the de-weighting and impurity removal device, and Na2S and alkali solution (such as NaOH) are added to the solution to form insoluble sulfide precipitates of heavy metal ions. The heavy metal ions are removed by precipitation separation. The wastewater from the pretreatment subsystem of the high-temperature disposal of medical waste and the solution after de-weighting and impurity removal are transported to the deammoniation device, so that the NaClO in the wastewater reacts with the NH3 in the head ash water washing filtrate as follows: 3NaClO+2NH3→N2↑+3NaCl+3H2O. NH3 is oxidized into N2 and H2O by sodium hypochlorite. This process not only removes NH3, but also increases the amount of NaCl, which can increase the subsequent NaCl production. The solution then enters the decolorization device for decolorization treatment. The solution passes through an adsorption column equipped with activated carbon. The activated carbon adsorbs the pigments and other organic impurities in the solution, making the solution clear and improving the quality of NaCl and KCl. Finally, the solution enters the evaporation and salt extraction device, and the treated solution is heated and evaporated. Due to the different solubility of NaCl and KCl at different temperatures, NaCl crystals are first precipitated, and then KCl crystals are obtained by continued evaporation. Through crystallization separation, NaCl and KCl are recovered respectively, realizing the effective treatment of the two wastes.

[0029] It should be noted that the washing solution contains heavy metal ions such as Cu / Cr / Zn that are soluble in water before the heavy and impurity removal treatment. Since sodium hypochlorite is a strong oxidant that can undergo oxidation reaction under appropriate conditions, if sodium hypochlorite (NaClO) is added to treat a solution containing trivalent chromium (Cr³⁺), it is possible to oxidize the trivalent chromium to hexavalent chromium (Cr 6 ⁺). The specific chemical formula is: 2Cr 3+ +3ClO-+4H2O→2CrO4 2- +6H + +3Cl - Hexavalent chromium is a substance that is highly toxic to humans and the environment. In this solution, NaClO is added after removing the heavy and impurities to prevent NaClO from oxidizing with Cr3+ (trivalent chromium) in water-soluble substances during subsequent treatment, thereby avoiding the generation of Cr 6+(Hexavalent chromium) can effectively prevent the increase of chromium toxicity and ensure the safety and environmental protection of the treatment process.

[0030] In some embodiments, in order to ensure that the chemical reaction between wastewater and sintering head ash water washing filtrate achieves the expected effect, a pH value detection device is specially arranged in the mixing container of wastewater and sintering head ash water washing filtrate. The pH value detection device can monitor the pH value in the mixed liquid in real time, so as to accurately control the mixing ratio of wastewater and sintering head ash water washing filtrate. In this way, the pH value of the mixed liquid can be effectively adjusted to ensure that the chemical reaction between wastewater and sintering head ash water washing filtrate is carried out within the optimal pH value range, thereby improving the efficiency and effect of the treatment.

[0031] In order to ensure that NaCl and KCl can be effectively separated, the temperature and time during the evaporation process are usually controlled to achieve the best separation effect. In some embodiments, in step S5, the evaporation temperature of the evaporation salt extraction process is controlled within the temperature range where the solubility difference between NaCl and KCl is the largest, which is 60°C-100°C. The specific operation steps are: Pre-evaporation: Heat the mixture to evaporate most of the water and form a high-concentration salt solution.

[0032] NaCl crystallization: Lower the temperature of the solution to allow NaCl to crystallize. The crystallization process of NaCl can be accelerated by stirring, cooling or other methods.

[0033] KCl crystallization: Continue to lower the solution temperature to allow KCl to crystallize. The crystallization process of KCl can also be accelerated by stirring, cooling or other methods.

[0034] Separation and drying: Separate the precipitated NaCl and KCl crystals by filtration or centrifugation, and then dry them.

[0035] In the above process, the setting of the NaCl crystallization and KCl crystallization temperatures is closely related to the concentrations of NaCl (sodium chloride) and KCl (potassium chloride) in the solution. In one possible embodiment, when NaCl crystallizes, the solution temperature is reduced by >90°C, and when KCl crystallizes, the solution temperature is reduced to about 43°C.

[0036] In this embodiment, the wastewater treated by steam method for medical waste is wastewater generated by steam treatment of medical waste, which is also disinfected and filtered by grid before being introduced into the system to eliminate pathogenic microorganisms in the wastewater. Specifically, after the wastewater is sent to the disinfection device, NaClO is added to the wastewater for disinfection, and sodium hypochlorite solution is evenly added to the wastewater through a dosing pump. The agitator ensures that sodium hypochlorite is fully mixed with the wastewater to ensure the disinfection effect. The contact time is generally 30 minutes to several hours, and the specific time depends on the degree of pollution of the wastewater and the concentration of the disinfectant. Pathogenic microorganisms present in the wastewater, including bacteria, viruses and fungi, can be eliminated. The grid is usually made of metal bars or mesh materials and installed in the wastewater inflow channel. When the wastewater flows through the grid, larger solid waste is intercepted, while the liquid part continues to flow. Through one or more grids, these grids can intercept larger solid waste to remove large particle impurities and suspended matter in the wastewater.

[0037] In order to effectively kill pathogenic microorganisms, in some embodiments, the amount of NaClO added in the disinfection treatment is set to 1.5-2 times the amount required by theoretical calculation, and the specific value can be adjusted according to actual test results.

[0038] The present invention utilizes the production wastewater of high-temperature steam treatment of medical waste to coordinately treat sintering machine head ash, so that the excess NaClO in the wastewater can be used to chemically react with NH3 in the machine head ash washing filtrate, and the reaction formula is: 3NaClO+2NH3→N2↑+3NaCl+3H2O. NH3 can be removed and NaCl can be generated through the oxidation-reduction reaction, so that the solution can not only solve the production wastewater in the process of high-temperature steam treatment of medical waste, but also remove ammonia in the process of sintering machine head ash washing, thereby avoiding the corrosion of the triple-effect evaporator by concentrated brine in the later stage, and realizing the effective treatment of the two wastes.

[0039] This scheme introduces the production wastewater of medical waste high-temperature steam treatment into the deammoniation treatment process. By adding NaClO after removing weight and impurities, it can prevent NaClO from reacting with Cr in water-soluble substances in the subsequent treatment process. 3+ (trivalent chromium) undergoes oxidation reaction, thereby avoiding the formation of Cr 6+ (Hexavalent chromium). Hexavalent chromium is a substance that is highly toxic to humans and the environment. Therefore, the treatment process of this solution can effectively prevent the increase of chromium toxicity and ensure the safety and environmental protection of the treatment process.

[0040] In the description of the present application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 application. Unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0041] It should be noted that, in this application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0042] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A sintering machine head ash treatment system for treating wastewater based on the medical waste steam method, characterized in that: include: A sintering machine head ash disposal subsystem, the sintering machine head ash disposal subsystem comprises a water washing and filtering device, a weight removal and impurity removal device and a denitrification device connected in sequence, for sequentially performing water washing and filtering treatment, weight removal and impurity removal treatment and denitrification treatment on solid waste; and, The medical waste steam treatment wastewater pretreatment subsystem is connected to the denitrification device and is used to send the medical waste steam treatment wastewater containing NaClO into the denitrification device.

2. The sintering machine head ash treatment system for treating wastewater based on the medical waste steam method according to claim 1 is characterized in that: The sintering machine head ash disposal subsystem also includes a decolorization device and an evaporation salt extraction device, which are used to sequentially decolorize and evaporate the solution produced by the denitrification device; The medical waste steam treatment wastewater pretreatment subsystem includes a disinfection device and a grid filter device. The disinfection device is used to disinfect the medical waste steam treatment wastewater to eliminate pathogenic microorganisms in the wastewater; the grid filter device is used to filter the wastewater to remove large particles.

3. A method for treating sintering machine head ash based on the medical waste steam method for treating wastewater, characterized in that: The sintering machine head ash treatment system for treating wastewater based on the medical waste steam method as described in any one of claims 1 to 2 further comprises the following steps: S1: Wash and filter the sintering machine head ash to dissolve the elements that can be recycled into water and filter and separate the iron salts that are insoluble in water; S2: performing a de-heavy and de-impurity treatment on the solution discharged after the water washing and filtering treatment to remove the heavy metal ions dissolved in the water washing process; S3: Denitrification treatment is performed on the solution discharged after the heavy and impurity removal treatment, and the medical waste steam treatment wastewater containing NaClO is introduced into the system, mixed with the head ash water washing filtrate according to a preset ratio, and chemically reacts with NH3 in the head ash water washing filtrate, oxidizing NH3 into N2 and H2O through sodium hypochlorite, removing NH3 and generating NaCl; S4: Decolorizing the solution discharged after denitrification treatment, using activated carbon to adsorb organic impurities in the solution to improve the quality of NaCl and KCl; S5: The solution discharged after the decolorization treatment is subjected to evaporation and salt extraction treatment, and NaCl and KCl are separated by evaporation and concentration method by utilizing the difference in solubility of NaCl and KCl at different temperatures.

4. The method for treating sintering machine head ash based on the medical waste steam method for treating wastewater according to claim 3 is characterized in that: The elements that can be recycled include potassium, sodium and chlorine.

5. The method for treating sintering machine head ash based on the medical waste steam method for treating wastewater according to claim 3, characterized in that: A pH value detection device is arranged in the mixing container of the wastewater and the sintering machine head ash water washing filtrate, and the mixing ratio of the wastewater and the sintering machine head ash water washing filtrate is controlled by real-time monitoring of the pH value.

6. The method for treating sintering machine head ash based on the medical waste steam method for treating wastewater according to claim 3, characterized in that: In step S5, the evaporation temperature of the evaporation salt extraction process is controlled within the temperature range where the solubility difference between NaCl and KCl is the largest, which is 60°C-100°C.

7. The method for treating sintering machine head ash based on the medical waste steam method for treating wastewater according to claim 3, characterized in that: The wastewater treated by the medical waste steam method is also disinfected before being introduced into the system to eliminate pathogenic microorganisms in the wastewater.

8. The method for treating sintering machine head ash based on the medical waste steam method for treating wastewater according to claim 7, characterized in that: The disinfection treatment eliminates pathogenic microorganisms in the wastewater, including bacteria, viruses and fungi, by adding NaClO into the wastewater.

9. The method for treating sintering machine head ash based on the medical waste steam method for treating wastewater according to claim 8, characterized in that: The amount of NaClO added is set to 1.5-2 times the amount required by theoretical calculation.

10. The method for treating sintering machine head ash based on the medical waste steam method for treating wastewater according to claim 9, characterized in that: The wastewater treated by the medical waste steam method is subjected to a grid filtration treatment after being disinfected to remove large particle impurities and suspended matter in the wastewater.

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