A leachate biochemical treatment process

Abstract

The application discloses a kind of garbage leachate biochemical treatment process, including concentration pool, adjusting pool, anaerobic tank, anaerobic settling tank, aerobic tank and aerobic settling tank and filtration unit, the anaerobic tank includes anaerobic reaction tank and anaerobic bacteria culture tank and anaerobic hybrid bacteria mixing tank, the aerobic tank includes aerobic reaction tank and aerobic bacteria culture tank and aerobic hybrid bacteria mixing tank, the application relates to the technical field of leachate, introduce filamentous fungi in aerobic hybrid bacteria mixing tank, filamentous fungi have very strong adsorption capacity to heavy metal, effectively reduce the influence of heavy metal on aerobic bacteria, introduce anion group with phosphate radical and acetate radical and amino acid in anaerobic hybrid bacteria mixing tank, so that part of anaerobic bacteria have the function of adsorbing heavy metal, which is by sacrificing part of anaerobic bacteria to make them have the function of adsorbing a large amount of heavy metal to protect most of anaerobic bacteria.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of leachate, in particular to a landfill leachate biochemical treatment process. BACKGROUND

[0002] The leachate is a kind of liquid with high concentration of organic or inorganic components produced in the process of landfill and under the seepage action of precipitation and groundwater, and the landfill leachate is complex in water quality and contains various toxic and harmful inorganic and organic substances.

[0003] The existing leachate treatment process adopts anaerobic biological filter (IAF) and biological aerated filter (IBAF) combined as a biological treatment process, the anaerobic biological filter utilizes the hydrolysis, fermentation and acidification of anaerobic microorganisms to realize denitrification through denitrifying bacteria, and can also reduce the cost of wastewater treatment; the effluent of the anaerobic biological filter enters the biological aerated filter for aerobic treatment, so that the organic matter is converted into carbon dioxide and water, ammonia nitrogen is converted into nitrate and nitrite, and trace heavy metal ions are removed by chelation with microorganisms, but in the investigation of landfill leachate, it is found that the content of heavy metals in some leachate exceeds the standard, and the heavy metal substances can inhibit the growth of microorganisms or cause the microorganisms to produce poisoning phenomenon, thereby causing the microbial reaction in the anaerobic tank and aerobic tank to decrease, and the leachate treatment to be incomplete. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a landfill leachate biochemical treatment process, which solves the problem of the influence of heavy metals in the existing leachate on the activity of anaerobic microorganisms and aerobic microorganisms.

[0005] To achieve the above object, the present application is implemented by the following technical scheme: a landfill leachate biochemical treatment process, comprising a concentration tank, a regulating tank, an anaerobic tank, an anaerobic settling tank, an aerobic tank, an aerobic settling tank and a filtration unit, the anaerobic tank comprising an anaerobic reaction tank, an anaerobic bacteria culture tank and an anaerobic hybrid bacteria mixing tank, and the aerobic tank comprising an aerobic reaction tank, an aerobic bacteria culture tank and an aerobic hybrid bacteria mixing tank;

[0006] S1: first introduce the landfill leachate into the concentration tank, then introduce the anaerobic bacteria group in the anaerobic bacteria culture tank into the anaerobic hybrid bacteria mixing tank, and introduce anion groups with phosphate, acetate and amino acids into the anaerobic hybrid bacteria mixing tank, then introduce the synthesized MOF into the anaerobic hybrid bacteria mixing tank and culture for 1 hour, in this process, anaerobic hybrid bacteria are formed, at the same time, the aerobic bacteria group in the aerobic bacteria culture tank is introduced into the aerobic hybrid bacteria mixing tank, and then filamentous fungi are introduced into the aerobic hybrid bacteria mixing tank;

[0007] S2: Then the leachate in the concentration tank is introduced into the conditioning tank for pH adjustment, and then introduced into the anaerobic reaction tank in the anaerobic tank, and the liquid in the anaerobic hybrid bacteria mixing tank is also introduced into the anaerobic reaction tank;

[0008] S3: Then the leachate in the anaerobic reaction tank is introduced into the anaerobic settling tank, and after the settling is completed, it is introduced into the aerobic reaction tank in the aerobic tank, and the liquid in the aerobic hybrid bacteria mixing tank is introduced into the aerobic reaction tank;

[0009] S4: Then the leachate in the aerobic reaction tank is introduced into the aerobic settling tank, and after the settling is completed, the leachate is subjected to reflux treatment, and finally sent to the filtration unit for treatment;

[0010] S5: The impurities in the anaerobic settling tank and the aerobic settling tank are sent to the sludge treatment unit for treatment.

[0011] Preferably, MOF is introduced into the anaerobic hybrid bacteria mixing tank, and the subsequent proliferated anaerobic hybrid bacteria are wrapped by MOF, which can make the anaerobic bacteria survive in the aerobic reaction tank, and at the same time, does not affect the function of the anaerobic bacteria.

[0012] Preferably, the cell surface of the anaerobic hybrid bacteria has anion groups with phosphate and acetate and amino acids.

[0013] Beneficial effects

[0014] The present application provides a garbage leachate biochemical treatment process, which has the following beneficial effects:

[0015] 1. MOF is added to the bacterial culture solution, so that the subsequent proliferated bacteria can be wrapped by MOF. In the electron microscope, the surface of the anaerobic hybrid bacteria is covered with very thin MOF, that is, a layer of metal organic framework (MOF) nanosheet is wrapped outside the bacteria, which reduces the mortality of anaerobic bacteria by 5 times in the presence of oxygen, does not affect the reproduction of bacteria, and enables anaerobic bacteria and aerobic bacteria to work simultaneously, without the need for reflux treatment in a certain environment, greatly improving the treatment function of the leachate.

[0016] 2. Filamentous fungi are introduced into the aerobic hybrid bacteria mixing tank. Filamentous fungi have strong adsorption capacity for heavy metals, effectively reducing the influence of heavy metals on aerobic bacteria. Anion groups with phosphate and acetate and amino acids are introduced into the anaerobic hybrid bacteria mixing tank. During the subsequent reproduction of anaerobic bacteria, anion groups appear on the cell walls of part of the anaerobic bacteria, so that part of the anaerobic bacteria have the function of adsorbing heavy metals. This method sacrifices part of the anaerobic bacteria to make them have the function of adsorbing a large amount of heavy metals to protect most of the anaerobic bacteria. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 Figure 1 is a flow chart of the present application.

[0018] Fig. 2 Figure 2 is a flow chart of the anaerobic tank of the present application.

[0019] Fig. 3 Figure 3 is a flow chart of the aerobic tank of the present application. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0021] Please refer to Figs. 1-3 The present application provides a technical solution: a landfill leachate biochemical treatment process, comprising a concentration tank, a conditioning tank, an anaerobic tank, an anaerobic settling tank, an aerobic tank, an aerobic settling tank and a filtration unit, the anaerobic tank comprising an anaerobic reaction tank, an anaerobic bacteria culture tank and an anaerobic hybrid bacteria mixing tank, and the aerobic tank comprising an aerobic reaction tank, an aerobic bacteria culture tank and an aerobic hybrid bacteria mixing tank.

[0022] S1: First, introduce the landfill leachate into the concentration tank, then introduce the anaerobic bacteria group in the anaerobic bacteria culture tank into the anaerobic hybrid bacteria mixing tank, and introduce anion groups with phosphate and acetate and amino acids into the anaerobic hybrid bacteria mixing tank, then introduce the synthesized MOF into the anaerobic hybrid bacteria mixing tank and culture for 1 hour, in which process the anaerobic hybrid bacteria are formed, at the same time, introduce the aerobic bacteria group in the aerobic bacteria culture tank into the aerobic hybrid bacteria mixing tank, then introduce the filamentous fungi into the aerobic hybrid bacteria mixing tank;

[0023] S2: Then introduce the landfill leachate in the concentration tank into the conditioning tank for PH value adjustment, then introduce the landfill leachate into the anaerobic reaction tank in the anaerobic tank, and also introduce the liquid in the anaerobic hybrid bacteria mixing tank into the anaerobic reaction tank;

[0024] S3: Then introduce the landfill leachate in the anaerobic reaction tank into the anaerobic settling tank, after the settling is completed, introduce the landfill leachate into the aerobic reaction tank in the aerobic tank, and also introduce the liquid in the aerobic hybrid bacteria mixing tank into the aerobic reaction tank;

[0025] S4: Then introduce the landfill leachate in the aerobic reaction tank into the aerobic settling tank, after the settling is completed, carry out reflux treatment on the landfill leachate, and finally send it into the filtration unit for treatment;

[0026] S5: The impurities in the anaerobic settling tank and the aerobic settling tank are sent to the sludge treatment unit for treatment;

[0027] The centralized tank, the conditioning tank, the anaerobic settling tank and the aerobic settling tank, and the filtration unit are mature technologies, and their structures and use modes are not described in detail because they are not the main innovations of the present application. The present application wraps a layer of metal organic framework (MOF) nanosheet on the surface of anaerobic bacteria, so that the anaerobic bacteria can survive in the environment of aerobic bacteria, the process of reflux treatment can be reduced, and anionic groups with phosphate and acetate and amino acids are formed on part of the anaerobic bacteria, so that part of the anaerobic bacteria can absorb most of the heavy metals to protect most of the anaerobic bacteria.

[0028] Further, the synthesized MOF is introduced into the anaerobic hybrid bacteria mixing tank, and the subsequent proliferated anaerobic hybrid bacteria are wrapped by the MOF, so that the anaerobic bacteria can survive in the aerobic reaction tank, and at the same time, the effect of the anaerobic bacteria itself is not affected.

[0029] Further, the cell surface of the anaerobic hybrid bacteria has anionic groups with phosphate and acetate and amino acids.

[0030] Through the technical personnel in the art, the parts in the case are connected in turn, and the specific connection and operation sequence should be referred to the working principle, and the detailed connection means is the public technical knowledge in the art, and the working principle and process are mainly introduced below.

[0031] Embodiment: First, the landfill leachate is introduced into the centralized tank, then the anaerobic bacteria group in the anaerobic bacteria culture tank is introduced into the anaerobic hybrid bacteria mixing tank, and the anionic groups with phosphate and acetate and amino acids are introduced into the anaerobic hybrid bacteria mixing tank, then the synthesized MOF is introduced into the anaerobic hybrid bacteria mixing tank and cultured for 1 hour, in this process, anaerobic hybrid bacteria are formed, at the same time, the aerobic bacteria group in the aerobic bacteria culture tank is introduced into the aerobic hybrid bacteria mixing tank, then the filamentous fungi are introduced into the aerobic hybrid bacteria mixing tank, then the landfill leachate in the centralized tank is introduced into the conditioning tank for PH value adjustment, then the landfill leachate is introduced into the anaerobic reaction tank in the anaerobic tank, at the same time, the liquid in the anaerobic hybrid bacteria mixing tank is also introduced into the anaerobic reaction tank, then the landfill leachate in the anaerobic reaction tank is introduced into the anaerobic settling tank, after the settling is finished, the landfill leachate is introduced into the aerobic reaction tank in the aerobic tank, at the same time, the liquid in the aerobic hybrid bacteria mixing tank is introduced into the aerobic reaction tank, then the landfill leachate in the aerobic reaction tank is introduced into the aerobic settling tank, after the settling is finished, the landfill leachate is subjected to reflux treatment, and finally it is sent to the filtration unit for treatment, and the impurities in the anaerobic settling tank and the aerobic settling tank are sent to the sludge treatment unit for treatment.

[0032] It has to be noted that, in the present document, the terms "first", "second", etc. merely serve to identify different entities or actions and do not necessarily require or imply any actual relationship or order between these entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. In other words, without further restriction, reference to elements will not, without more limitations, exclude additional, unrecited elements of a process, method, article, or apparatus.

[0033] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since numerous modifications and changes can be made to the embodiments without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A biochemical treatment process for landfill leachate, comprising a collection tank, an equalization tank, an anaerobic tank, an anaerobic settling tank, an aerobic tank, an aerobic settling tank, and a filtration unit, characterized in that: The anaerobic tank includes an anaerobic reaction tank, an anaerobic bacteria culture tank, and an anaerobic hybrid bacteria mixing tank; the aerobic tank includes an aerobic reaction tank, an aerobic bacteria culture tank, and an aerobic hybrid bacteria mixing tank. S1: First, the leachate is introduced into the collection tank. Then, the anaerobic bacteria in the anaerobic bacteria culture tank are introduced into the anaerobic hybrid bacteria mixing tank. Anionic groups with phosphate, acetate and amino acids are introduced into the anaerobic hybrid bacteria mixing tank. Then, the synthesized MOF is introduced into the anaerobic hybrid bacteria mixing tank and cultured for 1 hour. During this process, anaerobic hybrid bacteria will be formed. At the same time, the aerobic bacteria in the aerobic bacteria culture tank are introduced into the aerobic hybrid bacteria mixing tank. Then, filamentous fungi are introduced into the aerobic hybrid bacteria mixing tank. S2: Then the leachate in the collection tank is introduced into the equalization tank to adjust the pH value. Then the leachate is introduced into the anaerobic reactor in the anaerobic tank. At the same time, the liquid in the anaerobic hybrid bacteria mixing tank is also introduced into the anaerobic reactor. S3: Then the leachate in the anaerobic reactor is introduced into the anaerobic settling tank. After settling, it is introduced into the aerobic reactor in the aerobic tank. At the same time, the liquid in the aerobic hybrid bacteria mixing tank is introduced into the aerobic reactor. S4: Then the leachate in the aerobic reaction tank is introduced into the aerobic settling tank. After the settling is completed, the leachate is recycled and finally sent into the filter unit for treatment. S5: Send the impurities in the anaerobic and aerobic sedimentation tanks to the sludge treatment unit for processing.

2. The biochemical treatment process for landfill leachate according to claim 1, characterized in that, By introducing pre-synthesized MOF into the anaerobic hybrid bacteria mixing tank, the subsequently proliferating anaerobic hybrid bacteria are encapsulated by the MOF, enabling the anaerobic bacteria to survive in the aerobic reaction tank without affecting their own function.

3. The biochemical treatment process for landfill leachate according to claim 2, characterized in that, The cell surface of the anaerobic hybrid bacteria contains anionic groups with phosphate, acetate, and amino acids.

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