Biological cyanide breaking system and method

Abstract

The invention relates to the technical field of industrial wastewater treatment, and discloses a biological cyanide breaking system which comprises a cyanide breaking unit, a detection unit and a control unit, the cyanide breaking unit comprises a cyanide breaking tank, microorganisms are arranged in the cyanide breaking tank, the cyanide breaking tank is connected with a feeding pipe and a discharging pipe, and the discharging pipe is connected with a water inlet pipe and a water outlet pipe. The feeding pipe is used for conveying cyanogen-containing wastewater into the cyanogen breaking tank, the microbiota is used for decomposing cyanogen elements in the cyanogen-containing wastewater, and the discharging pipe is used for outputting wastewater subjected to cyanogen breaking processing; the detection unit is used for detecting the living environment of the microorganisms in the cyanide breaking tank, and the control unit is used for adjusting the environment in the cyanide breaking unit according to the detection result of the detection unit. The invention further aims to provide a biological cyanide breaking method which is suitable for the biological cyanide breaking system. The method has the beneficial effects that the cyanide breaking processing cost is low, and the effect of removing the cyanide element in the wastewater is good.

Description

Technical Field

[0001] The invention relates to the technical field of industrial wastewater treatment, and in particular to a biological cyanide destruction system and method. Background Art

[0002] Cyanide is a common compound in industry and is used in a variety of industrial production. Cyanide compounds such as hydrogen cyanide and cyanohydrin are widely used in chemical synthesis, medicine and pesticides, metal processing and other fields. When hydrogen cyanide is used in the production and processing process, there will usually be some cyanide residues in the wastewater generated during the production and processing. Since cyanide itself has highly toxic properties, if these highly toxic wastewaters are discharged without treatment, it will seriously pollute the natural environment and water resources, and will have a significant impact on animals, plants and human health. Therefore, after the production and processing of cyanide, it is usually necessary to break the cyanide of the wastewater to remove the residual cyanide in the wastewater.

[0003] For example, the patent document with the announcement number CN106396205B discloses a method for removing heavy metals from high-concentration cyanide wastewater by breaking cyanide, comprising the following steps: (1) injecting high-concentration cyanide wastewater into an electrolytic cell and electrolyzing it using a DC power supply under alkaline conditions; (2) during the electrolysis process, the cyanide content gradually decreases, and hydrogen peroxide is added to promote its reaction rate, and finally electrolyzes to obtain low-concentration cyanide wastewater; (3) adjusting the pH value of the low-concentration cyanide wastewater obtained in step (2) to 10-11, adding EDTA and a catalyst to react; (4) adding hydrogen peroxide to the solution obtained in step (3) for deep cyanide breaking treatment; (5) for the wastewater obtained in step (4) after the cyanide is completely broken, the heavy metals in the solution are removed by the ferrite method. This technical solution can remove high-concentration cyanide and deeply treat the wastewater after the cyanide is broken, especially ferrocyanide, to meet the emission standards.

[0004] Although the above technical scheme can realize the treatment of cyanide in wastewater, the above technical scheme adopts physical and chemical electroplating to break the cyanide when treating cyanide, so that a large amount of chemical agents such as EDTA and hydrogen peroxide need to be used in the process of breaking the cyanide, which increases the cost of wastewater cyanide breaking processing, and the cyanide-containing wastewater is broken by chemical reagents through the Fenton method, so that other hazardous wastes will be generated after the cyanide breaking process, resulting in that after the cyanide-containing wastewater is broken, the hazardous waste generated by the treatment of the cyanide-containing wastewater needs to be treated again, which increases the cyanide breaking process steps and further increases the cost of the cyanide breaking process. Summary of the invention

[0005] The present invention aims to provide a biological cyanide breaking system and method to solve the technical problems of complex cyanide breaking process and high cyanide breaking process cost in the prior art.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a biological cyanide breaking system, comprising a cyanide breaking unit, a detection unit and a control unit, the cyanide breaking unit comprising a cyanide breaking tank, a microbial community is arranged in the cyanide breaking tank, a feed pipe and a discharge pipe are connected to the cyanide breaking tank, the feed pipe is used to transport cyanide-containing wastewater into the cyanide breaking tank, the microbial community is used to decompose the cyanide element in the cyanide-containing wastewater, and the discharge pipe is used to output the wastewater after cyanide breaking processing; the detection unit is used to detect the living environment of the microorganisms in the cyanide breaking tank, and the control unit is used to adjust the environment in the cyanide breaking unit according to the detection result of the detection unit.

[0007] The principles and advantages of this solution are as follows: when cyanide-containing wastewater is subjected to cyanide breaking processing, the cyanide-containing wastewater is transported to the cyanide breaking tank through a feed pipe, and the cyanide in the wastewater is decomposed by the decomposition action of the microbial community, and the wastewater after the cyanide breaking processing is output through a discharge pipe; during the cyanide breaking processing, the detection unit detects the environment in the cyanide breaking tank, and adjusts the environment in the cyanide breaking tank through the control unit, so that the environment in the cyanide breaking tank can be maintained within the living range of the microbial community.

[0008] In this scheme, when the cyanide-containing wastewater is subjected to cyanide breaking processing, the cyanide-containing wastewater is transported to a cyanide breaking tank loaded with a microbial community, and the cyanide in the wastewater is decomposed by the microbial community, which can effectively reduce the cyanide content in the wastewater while reducing the use of hazardous chemicals in the cyanide breaking processing and reducing the cost of the cyanide breaking processing; and no further hazardous waste will be generated after the cyanide breaking processing, thereby avoiding secondary pollution that may be caused by chemical methods, improving the safety and environmental protection of the cyanide breaking processing, and there is no need to conduct secondary treatment on the hazardous waste generated by the cyanide breaking processing after the cyanide breaking processing, thereby reducing the process steps and cost of the cyanide breaking processing.

[0009] Preferably, as an improvement, the feed pipe is connected to the bottom of the cyanide breaking tank, and the discharge pipe is connected to the top of the cyanide breaking tank away from one end of the feed pipe. The cyanide-containing wastewater can be gradually discharged from the bottom of the cyanide breaking tank to the top of the cyanide breaking tank, ensuring that the cyanide-containing wastewater can fully stay in the cyanide breaking tank, increasing the contact time between the microbial community and the cyanide-containing wastewater, ensuring that the microorganisms can have sufficient time to break the cyanide of the wastewater, ensuring that the cyanide in the wastewater can be fully decomposed in the cyanide breaking tank, and improving the removal effect of cyanide in the wastewater.

[0010] Preferably, as an improvement, an air inlet pipe is further provided at the bottom of the cyanide breaking tank, and the air inlet pipe is used to transport air into the cyanide breaking tank, and an aeration pipe network is provided at one end of the air inlet pipe located in the cyanide breaking tank. By aerating the cyanide breaking tank, oxygen can be transported into the cyanide breaking tank during the aeration process, and while ensuring that the survival of the microbial community in the cyanide breaking tank can have sufficient oxygen content, the wastewater is impacted during the aeration process to achieve mixing between the wastewater and the microbial community, ensuring that the microbial community can be evenly distributed in the wastewater, and improving the cyanide breaking effect of the microbial community.

[0011] Preferably, as an improvement, the detection unit is used to detect the temperature, oxygen content and pH value in the cyanide breaking tank, and the control unit is used to adjust the temperature, oxygen content and pH value in the cyanide breaking tank according to the various test results detected by the detection unit. By adjusting the environment in the cyanide breaking tank, it is ensured that the environment in the cyanide breaking tank can be the working environment of the composite microbial community, and the cyanide breaking efficiency of the microbial community is ensured.

[0012] Preferably, as an improvement, the cyanide breaking unit further comprises an auxiliary tank, the auxiliary tank is connected in series with the cyanide breaking tank, and the auxiliary tank is used for performing auxiliary cyanide breaking treatment on the wastewater after cyanide breaking processing in the cyanide breaking tank.

[0013] Preferably, as an improvement, the detection unit is also used to detect the cyanide content of the wastewater output from the discharge port of the cyanide breaking tank, and the control unit is also used to control the auxiliary cyanide breaking processing of the wastewater by the auxiliary tank according to the detection result of the detection unit. The auxiliary tank is used to perform auxiliary cyanide breaking processing on the wastewater after the cyanide breaking of the cyanide breaking tank, so as to ensure that when the cyanide content in the wastewater after the cyanide breaking is greater than the preset value due to the abnormal cyanide breaking efficiency of the microbial community, the auxiliary tank can be used for further cyanide breaking treatment, so as to ensure the overall effect of the wastewater cyanide breaking treatment and avoid environmental pollution caused by cyanide leakage.

[0014] The present invention also intends to provide a biological cyanide breaking method, which is applicable to the above-mentioned multi-stage cyanidation reaction system, and is characterized by comprising the following steps: step 1, transporting the microbial group to a cyanide breaking tank for domestication;

[0015] Step 2, transporting the cyanide-containing wastewater to a cyanide-breaking tank containing the microbial community cultured in step 1 for cyanide-breaking processing;

[0016] Step 3: Detect and adjust the environment during the cyanide breaking process;

[0017] Step 4: Detect the cyanide content in the wastewater after cyanide breaking, and perform secondary cyanide breaking processing on the wastewater after cyanide breaking through an auxiliary tank according to the detection result.

[0018] Preferably, as an improvement, in step 1, the content of the microbial community in the cyanide breaking tank is not less than 1 / 3 of the volume of the cyanide breaking tank, so that there can be enough microbial communities in the cyanide breaking tank to avoid too little microbial community in the cyanide breaking tank, which affects the effect of the cyanide breaking process.

[0019] Preferably, as an improvement, in step 1 and step 3, the oxygen content of the solution in the cyanide breaking tank is 2-3 g / l, the pH is between 6.8-7.8, and the temperature is between 36° C. and 38° C. This ensures that the microbial community in the cyanide breaking tank has sufficient vitality and improves the cyanide breaking efficiency of the microbial community.

[0020] Preferably, as an improvement, in step 1 and step 3, the trace elements in the solution in the cyanide breaking tank are also monitored, and the trace elements include P, Sr, Ni, Mo, and Mn elements, and the content of each trace element is not less than 2 mg / l, 2 mg / l, 1 mg / l, 3 mg / l, and 3 mg / l, respectively. This allows the microbial community to have sufficient nutrients for survival in the cyanide breaking tank, ensuring the survival effect of the microbial community. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of the biological cyanide destruction system in the embodiment of the present invention.

[0022] Figure 2 The figure is a flowchart of the biological cyanide destruction method in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following is further described in detail through specific implementation methods:

[0024] The reference numerals in the drawings of the specification include: cyanide breaking unit 1 , cyanide breaking tank 101 , cyanide breaking chamber 102 , feed pipe 103 , discharge pipe 104 , air inlet pipe 2 , aeration pipe network 201 , and auxiliary tank 3 .

[0025] As attached Figure 1 As shown, a biological cyanide destruction system includes a cyanide destruction unit 1, and the cyanide destruction unit 1 is used to destroy cyanide in wastewater.

[0026] The cyanide breaking unit 1 comprises a cyanide breaking tank 101, which comprises a tank body, a cyanide breaking chamber 102 is provided in the tank body, a feed port is provided at the bottom of the cyanide breaking tank 101, the feed port is connected to the inner wall and outer wall of the cyanide breaking tank 101, and a feed pipe 103 is provided at one end of the feed port away from the cyanide breaking chamber 102, one end of the feed pipe 103 is connected to the feed port, and the other end of the feed pipe 103 is connected to a wastewater conveying device, and the feed port is used to transport cyanide-containing wastewater into the cyanide breaking chamber 102. A discharge port is provided at the top of the cyanide breaking tank 101 away from one side of the feed port, the discharge port is connected to the inner wall and outer wall of the cyanide breaking tank 101, and the discharge port is connected to a discharge pipe 104 at one end away from the cyanide breaking chamber 102, and the discharge pipe 104 is used to output the wastewater after the cyanide breaking treatment in the cyanide breaking chamber 102. Wherein the specific structure of the cyanide breaking tank 101 is prior art, which will not be repeated here. The cyanide-containing wastewater can be gradually discharged from the bottom of the cyanide-breaking tank 101 to the top of the cyanide-breaking tank 101, ensuring that the cyanide-containing wastewater can fully stay in the cyanide-breaking tank 101 to break the cyanide, ensuring that the cyanide in the wastewater can be fully decomposed in the cyanide-breaking tank 101, and improving the removal effect of cyanide in the wastewater.

[0027] A microbial community is stored in the cyanide breaking chamber 102, and the microbial community is used to decompose the cyanide element in the cyanide-containing wastewater transported to the cyanide breaking chamber 102. The microbial community can be a strain of bacteria (such as sulfur oomycetes, Fusarium mold, Pseudomonas bacteria and other specific strains) screened from the soil that is tolerant to cyanide. The specific content of the microbial community and the cyanide breaking content are prior art and will not be repeated here.

[0028] An air inlet pipe 2 is also provided at the bottom of the cyanide breaking tank 101, one end of the air inlet pipe 2 is connected to a gas delivery device, and the other end of the air inlet pipe 2 extends into the cyanide breaking tank 101, and the air inlet pipe 2 is used to deliver air into the cyanide breaking tank 101, wherein the gas delivery device can be an air pump or other devices. An aeration pipe network 201 is provided at one end of the air inlet pipe 2 located in the cyanide breaking tank 101, and an air inlet of the aeration pipe network 201 is communicated with the air inlet pipe 2, and the aeration pipe network 201 is laid at the bottom of the cyanide breaking chamber 102 in the cyanide breaking tank 101, and the aeration pipe network 201 is used to aerate the cyanide breaking chamber 102. By aerating the cyanide breaking tank 101, oxygen can be delivered to the cyanide breaking tank 101 during the aeration process, and while ensuring that the survival of the microbial community in the cyanide breaking tank 101 can have sufficient oxygen content, by impacting the wastewater during the aeration process, mixing between the wastewater and the microbial community is achieved, ensuring that the microbial community can be evenly distributed in the wastewater, and improving the cyanide breaking effect of the microbial community.

[0029] It also includes a detection unit, which is used to detect the environment in the cyanide breaking tank 101. The specific detection unit is used to detect the temperature, oxygen content and pH in the cyanide breaking tank 101. The specific detection unit includes multiple sensors, and the multiple sensors are used to detect the parameters in the cyanide breaking tank 101. In this embodiment, the detection unit uses a temperature sensor with a model number of E52-P10GPY to detect the temperature of the wastewater in the cyanide breaking tank 101, and uses a dissolved oxygen sensor with a model number of InPro6860i to detect the dissolved oxygen content of the microbial community liquid in the cyanide breaking tank 101. The pH detection sensor with a model number of PH4502C is used to detect the pH of the microbial community liquid in the cyanide breaking tank 101. The specific content of the detection unit detecting various parameters in the cyanide breaking tank 101 through sensors is the prior art, which will not be repeated here. By detecting the temperature, oxygen content and pH value in the cyanide breaking tank 101, it is convenient to adjust the living and working environment of the microorganisms, and avoid the death of the microorganisms in the cyanide breaking tank 101, which affects the normal progress of the cyanide breaking process.

[0030] It also includes a control unit, which is used to adjust the environment in the cyanide breaking tank 101 according to the various detection results detected by the detection unit. The specific control unit includes a heat exchange part, which is located on the feed pipe 103, and the heat exchange part is used to adjust the temperature of the wastewater transported to the cyanide breaking tank 101 in the feed pipe 103. The control unit adjusts the temperature of the wastewater transported to the cyanide breaking tank 101 through the heat exchange part according to the temperature parameter detected by the detection unit, wherein the heat exchange part can be a heat exchange device such as a heat exchanger; when the control unit adjusts the oxygen content in the cyanide breaking tank 101, the control unit controls the aeration amount in the cyanide breaking tank 101 by controlling the aeration pipe according to the oxygen detection content result in the detection unit, so as to adjust the oxygen content; when the control unit adjusts the pH in the cyanide breaking tank 101, it can add a pH regulator into the cyanide breaking tank 101 according to the actual pH value detected by the detection unit. Wherein the control unit can be a control chip such as a single-chip microcomputer and a microprocessor. Preferably, in the present embodiment, the control unit selects a single-chip microcomputer of model STM32F103 to control and manage the cyanide breaking unit 1. The specific content that the control unit adjusts the temperature, oxygen content and pH value is the prior art, which will not be repeated here. By adjusting the environment in the cyanide breaking tank 101, it is ensured that the environment in the cyanide breaking tank 101 can be the working environment of the composite microbial group, and the cyanide breaking efficiency of the microbial group is ensured.

[0031] The cyanide breaking unit 1 also includes an auxiliary tank 3, which is connected in series with the cyanide breaking tank 101. The feed port of the specific auxiliary tank 3 is connected to the discharge pipe 104 on the cyanide breaking tank 101, and the auxiliary tank 3 is used to perform auxiliary cyanide breaking treatment on the wastewater after the cyanide breaking process of the cyanide breaking tank 101. The auxiliary tank 3 can perform auxiliary cyanide breaking treatment on the wastewater by adsorption treatment, membrane separation treatment or electrolysis, and the specific content and structure of the auxiliary tank 3 breaking cyanide on the wastewater are prior art, which will not be repeated here.

[0032] The detection unit is also used to detect the cyanide content of the waste water output from the discharge port of the cyanide breaking tank 101. Specifically, a cyanide ion sensor of model VLAN / CN240 is provided in the output port of the cyanide breaking tank 101, and the detection unit detects the cyanide content of the treated waste water output by the cyanide breaking tank 101 through the sensor. The control unit is also used to control the auxiliary cyanide breaking processing of the waste water by the auxiliary tank 3 according to the detection result of the cyanide content in the waste water output by the cyanide breaking tank 101. The auxiliary tank 3 is used to perform auxiliary cyanide breaking processing on the waste water after the cyanide breaking of the cyanide breaking tank 101, and ensure that when the cyanide content in the waste water after the cyanide breaking is greater than the preset value due to the abnormality in the cyanide breaking efficiency of the microbial community, the auxiliary tank 3 can be further broken cyanide processed to ensure the overall effect of the waste water cyanide breaking processing, and avoid cyanide leakage to cause environmental pollution.

[0033] The present invention also intends to provide a biological cyanide breaking method, which is applicable to the above-mentioned biological cyanide breaking system; Figure 2 As shown, the following steps are included:

[0034] Step 1: transporting the microbial community to the cyanide breaking tank 101 for domestication; specifically, after transporting the microbial community liquid containing multiple microbial communities to the cyanide breaking tank 101, aeration is introduced into the cyanide breaking tank 101, and at the same time, cyanide-containing bacterial expansion wastewater is gradually transported into the cyanide breaking tank 101 to domesticate the microbial community.

[0035] In step 1, the content of the microbial community liquid in the cyanide breaking tank 101 is not less than 1 / 3 of the volume of the cyanide breaking tank 101. This allows the cyanide breaking tank 101 to have sufficient microbial communities, thereby preventing the microbial community content in the cyanide breaking tank 101 from being too low, thereby affecting the effect of the cyanide breaking process.

[0036] In step 1, when the microbial community is domesticated, 10 m3 of cyanide is added to the cyanide breaking tank 101 every day. 3 After the cyanide-breaking tank 101 reaches the outlet volume, press 1m 3 / h and add the bacterial expansion wastewater at an average rate, and continuously detect the cyanide content in the effluent of the cyanide breaking tank 101. When the cyanide content in the effluent is lower than 1mg / L, gradually increase it by 1m / L every 3 days. 3 / h to increase the water flow rate. When the cyanide content in the effluent is higher than 1mg / l, stop increasing the water flow rate. Wait until the water flow reaches 10m3 / h later, cyanide-containing wastewater is added for cyanide breaking processing, so that the microbial community can be gradually domesticated in the cyanide breaking tank 101, thereby improving the degradation efficiency and adaptability of the microbial community.

[0037] Step 2: transporting the cyanide-containing wastewater to the cyanide-breaking tank 101 containing the microbial community cultured in step 1 for cyanide-breaking processing;

[0038] Step 3, detecting and adjusting the environment in the cyanide breaking tank 101 during the cyanide breaking process in step 2;

[0039] Step 4: Detect the cyanide content in the wastewater after cyanide breaking in step 2, and perform secondary cyanide breaking processing on the wastewater after cyanide breaking through auxiliary tank 3 according to the detection result.

[0040] In step 1 and step 3, the oxygen content of the solution in the cyanide breaking tank 101 is 2-3 g / L, the pH is between 6.8-7.8, and the temperature is between 36° C. and 38° C. This ensures that the microorganisms in the cyanide breaking tank 101 have sufficient vitality and improves the cyanide breaking efficiency of the microorganisms.

[0041] In step 1 and step 3, the trace elements in the solution in the cyanide breaking tank 101 are also monitored, wherein the trace elements include P, Sr, Ni, Mo, and Mn, and the content of each trace element is not less than 2 mg / l, 2 mg / l, 1 mg / l, 3 mg / l, and 3 mg / l, respectively. This allows the microbial community in the cyanide breaking tank 101 to have sufficient nutrients for survival, thereby ensuring the survival effect of the microbial community.

[0042] In step 4, when the cyanide content in the wastewater after cyanide breaking treatment is greater than 1 ppm, the wastewater is subjected to secondary cyanide breaking treatment through auxiliary tank 3. This ensures that the cyanide in the wastewater can be fully removed, avoids the presence of cyanide residue in the discharged wastewater, and improves the safety of the treated wastewater discharge.

[0043] Compared with the prior art, in this scheme, when cyanide-containing wastewater is subjected to cyanide breaking processing, the cyanide-containing wastewater is transported to a cyanide breaking tank 101 loaded with a microbial community, and the cyanide in the wastewater is decomposed by the microbial community, which can effectively reduce the cyanide content in the wastewater while reducing the use of hazardous chemicals in the cyanide breaking processing process and reducing the cost of the cyanide breaking processing; and no further hazardous waste will be generated after the cyanide breaking processing, thereby avoiding secondary pollution that may be caused by chemical methods, improving the safety and environmental protection of the cyanide breaking processing, and there is no need to perform secondary treatment on the hazardous waste generated by the cyanide breaking processing after the cyanide breaking processing, thereby reducing the process steps and cost of the cyanide breaking processing.

[0044] It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the technical solution of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A biological cyanide destruction system, characterized in that: The invention comprises a cyanide breaking unit, a detection unit and a control unit. The cyanide breaking unit comprises a cyanide breaking tank, in which a microorganism group is arranged. The cyanide breaking tank is connected with a feeding pipe and a discharging pipe. The feeding pipe is used for conveying cyanide-containing wastewater into the cyanide breaking tank, the microorganism group is used for decomposing the cyanide element in the cyanide-containing wastewater, and the discharging pipe is used for outputting the wastewater after cyanide breaking processing. The detection unit is used for detecting the living environment of the microorganisms in the cyanide breaking tank, and the control unit is used for adjusting the environment in the cyanide breaking unit according to the detection result of the detection unit.

2. A biological cyanide destruction system according to claim 1, characterized in that: The feed pipe is connected to the bottom of the cyanide breaking tank, and the discharge pipe is connected to the top of the cyanide breaking tank away from one end of the feed pipe.

3. A biological cyanide destruction system according to claim 1, characterized in that: An air inlet pipe is also provided at the bottom of the cyanide breaking tank, and the air inlet pipe is used to transport air into the cyanide breaking tank. An aeration pipe network is provided at one end of the air inlet pipe located in the cyanide breaking tank.

4. A biological cyanide destruction system according to claim 1, characterized in that: The detection unit is used to detect the temperature, oxygen content and pH value in the cyanide breaking tank, and the control unit is used to adjust the temperature, oxygen content and pH value in the cyanide breaking tank according to the detection results detected by the detection unit.

5. A biological cyanide destruction system according to claim 1, characterized in that: The cyanide breaking unit further comprises an auxiliary tank, which is connected in series with the cyanide breaking tank and is used for performing auxiliary cyanide breaking treatment on the wastewater after cyanide breaking treatment in the cyanide breaking tank.

6. A biological cyanide destruction system according to claim 5, characterized in that: The detection unit is also used to detect the cyanide content of the wastewater output from the discharge port of the cyanide breaking tank, and the control unit is also used to control the auxiliary tank to perform auxiliary cyanide breaking processing on the wastewater according to the detection result of the detection unit.

7. A biological cyanide destruction method, applicable to the multi-stage cyanidation reaction system according to any one of claims 1 to 6, characterized in that: The following steps are included: Step 1: transporting the microbial community to a cyanide-breaking tank for domestication; Step 2, transporting the cyanide-containing wastewater to a cyanide-breaking tank containing the microbial community cultured in step 1 for cyanide-breaking processing; Step 3: Detect and adjust the environment during the cyanide breaking process; Step 4: Detect the cyanide content in the wastewater after cyanide breaking, and perform secondary cyanide breaking processing on the wastewater after cyanide breaking through an auxiliary tank according to the detection result.

8. A biological cyanide destruction method according to claim 8, characterized in that: In step 1, the content of the microbial community in the cyanide breaking tank is not less than 1 / 3 of the volume of the cyanide breaking tank.

9. A biological cyanide destruction method according to claim 8, characterized in that: In step 1 and step 3, the oxygen content of the solution in the cyanide-breaking tank is 2-3 g / l, the pH is between 6.8-7.8, and the temperature is between 36° C. and 38° C.

10. A biological cyanide destruction method according to claim 8, characterized in that: In step 1 and step 3, the trace elements in the solution in the cyanide breaking tank are also monitored. The trace elements include P, Sr, Ni, Mo, and Mn elements, and the content of each trace element is not less than 2 mg / l, 2 mg / l, 1 mg / l, 3 mg / l, and 3 mg / l, respectively.

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