Treatment method of lysine fermentation wastewater and waste gas

Abstract

The invention discloses a lysine fermentation wastewater and waste gas treatment method.The lysine fermentation wastewater and waste gas treatment method comprises the following steps of 1, material adding, 2, drying through a drying tower, 3, secondary drying and 4, gas deodorization. The method is environmentally friendly, efficient, simple in process, stable in heat supply and high in heat efficiency.

Description

Technical Field

[0001] The invention belongs to the field of fermentation product treatment, and specifically provides a method for treating lysine fermentation wastewater and waste gas. Background Art

[0002] After lysine fermentation, a large amount of wastewater and waste gas are produced. The wastewater contains a large amount of waste residue and organic matter. Direct discharge is wasteful and pollutes the environment.

[0003] Application number: 2023104937262, the present invention relates to the field of wastewater pretreatment technology, and discloses a wastewater pretreatment method and equipment for detecting amino acids from wool washing wastewater, the wastewater pretreatment method comprising the following steps: step one: placing the wool washing wastewater into the wastewater pretreatment equipment; step two: injecting sulfuric acid solution into the wastewater pretreatment equipment, and intermittently passing air into the wastewater pretreatment equipment to make the pH value of the wool washing wastewater be between 4 and 5; step three: using the wastewater pretreatment equipment to centrifuge the wool washing wastewater, discharging the precipitate after centrifugation, collecting the supernatant, and then detecting amino acids in the supernatant. The present invention realizes the injection of wastewater, and finally obtains the supernatant through the centrifugal action of the centrifuge tank, which facilitates the detection of amino acids and improves the pretreatment efficiency of wastewater.

[0004] The direct emission of the above solution is rather wasteful and will cause air pollution. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a method for treating lysine fermentation wastewater and waste gas.

[0006] The present invention is achieved through the following technical solutions: A method for treating lysine fermentation wastewater and waste gas comprises the following steps: step 1) adding materials, step 2) drying in a drying tower, step 3) secondary drying, and step 4) gas deodorization.

[0007] Furthermore, the method comprises the following steps: Step 1) Adding materials: Store the wastewater in a slurry storage tank, add humic acid, urea, and monoammonium phosphate, stir evenly, and then atomize and granulate; Step 2) Drying in a drying tower: the atomized fertilizer in step 1) is put into a drying tower for drying to obtain dry fertilizer and dry waste gas; Step 3) secondary drying: connecting the dried fertilizer in step 2) to a cyclone separator for secondary drying to obtain separated fertilizer and separated waste gas; Step 4) Gas deodorization: The dried waste gas from step 2), the separated waste gas from step 3) and the dust-removed waste gas are cooled, and then filtered through a primary filter to obtain filtered air.

[0008] Preferably, the feed liquid is prepared according to the following process: Urea, monoammonium phosphate and humic acid were put into a feed tank in a mass ratio of 4:4:1, mixed evenly to obtain a mixture, and then 5 times the mass of amino acid fermentation waste liquid was added, stirred evenly to obtain a feed liquid.

[0009] The technical solution of the present invention has the following outstanding advantages and uniqueness: 1. The method of the present invention achieves the dual effects of energy recovery and energy saving and emission reduction, and can process 0.5-1T of liquid waste gas per day.

[0010] 2. After the waste gas treatment described in the present invention, the fuel is burned with coal in the hot air furnace. The hot air is smoke-free and has high purity. The dust content is 20-80mg / Nm 3 .

[0011] 3. The bag dust collector of the present invention is a compressed air pulse cleaning structure with good filtering effect; the structure of the cyclone separator is a four-parallel bypass structure, and the separation process is simple to operate and easy to adjust.

[0012] 4. After the waste gas is treated, the fuel is burned with coal in the hot blast furnace, and the combustion is complete, with a thermal efficiency of more than 95%.

[0013] 5. The present invention effectively utilizes the waste liquid of amino acid fermentation to prepare fertilizer liquid, which is environmentally friendly and pollution-free, and reduces the pressure of sewage discharge. Moreover, the waste gas generated during the liquid treatment process after being treated by the discharge dust removal system is cooled and collected and then enters the heating system for secondary utilization, thereby realizing the comprehensive utilization of waste and having good economic and environmental benefits. The present invention is environmentally friendly and efficient, has a simple process, low production cost, stable heating, and high thermal efficiency. DETAILED DESCRIPTION

[0014] Those skilled in the art can refer to the content of this article and appropriately improve the process parameters. It is particularly important to point out that all similar replacements and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention. The products and methods of the present invention have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the products and methods described herein without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention. In order to further understand the present invention, the present invention is described in detail below in conjunction with embodiments. Example

[0015] A method for treating lysine fermentation wastewater and waste gas, wherein the feed liquid is connected to a high-speed centrifugal atomizer through a delivery pump, and the feed liquid is atomized by high-speed centrifugation to obtain atomized fertilizer. The waste gas generated by the atomized fertilizer through a drying tower, a cyclone separator, and a bag filter is collected through a cooling straight pipe and a pulse tube, and after treatment, it is connected to a direct-fired hot air furnace for combustion, and the generated hot air is then heated by the drying equipment. It includes the following steps: 1) Urea, monoammonium phosphate, potassium humate and zeolite powder are put into a feed tank in a mass ratio of 3:2:1:1, mixed evenly to obtain a mixture, and then the same mass of amino acid fermentation waste liquid is added, and stirred evenly to obtain a feed liquid; the prepared feed liquid is stored in a slurry storage tank, connected to a high-speed centrifugal atomizer for atomization through a feed pump, and the feed liquid is continuously and evenly transformed into a mist in the high-speed centrifugal atomizer through high-speed rotation, and the water evaporates and vaporizes to obtain an atomized fertilizer.

[0016] 2) The atomized fertilizer in step 1 is pumped into a drying tower for drying, and the temperature of the drying tower is maintained at 290-330° C. by a hot air distributor to obtain dry fertilizer and dry exhaust gas.

[0017] 3) Connect the dried fertilizer in step 2 to four parallel bypass high-efficiency cyclone separators for secondary drying. The temperature entering the cyclone separator is 95°C, and the inlet wind speed is maintained at 22-26m / s and the air volume is 41000-42000m 3 / h, and obtain separated fertilizer and separated waste gas. The separated fertilizer is connected to the collecting bin, and the separated waste gas is regulated by the induced draft fan.

[0018] 4) Connect the separated fertilizer in step 3 to the compressed air pulse cleaning bag dust collector for collection and dust removal. Maintain the inlet temperature of the bag dust collector at 90°C and the inlet air volume at 40000-41000m 3 / h, and obtain finished fertilizer and dust-removed exhaust gas.

[0019] 5) The dry waste gas from step 2, the separated waste gas from step 3, and the dust removal waste gas from step 4 are regulated by a fan. The fan inlet temperature is 90-100°C, the outlet pressure is not less than 9500pa, and the air volume is maintained at 50000-60000m 3 / h.

[0020] 6) The exhaust gas induced by the induced draft fan in step 5 is connected to a cooling straight pipe with a diameter of 0.65m for cooling, and the cooling gas is collected centrally.

[0021] 7) The cooling gas in step 6 is connected to the pulse tube for treatment, and then connected to the air filter after the exhaust gas is collected, and the combustible exhaust gas is obtained after being treated by the pulse controller and the pulse electromagnetic instrument.

[0022] 8) The air is filtered through a primary filter to obtain filtered air.

[0023] 9) The filtered air in step 8, the combustible waste gas in step 7 and the coal are connected to a direct-fired coal-fired hot air furnace for full combustion to provide hot air and power for the entire system.

[0024] 10) The hot air generated in step 9 is connected to the spray hot air volute through the induced draft fan for secondary filtration to obtain filtered hot air.

[0025] 11) The filtered hot air from step 10 is passed through a hot air distributor to heat the drying tower, cyclone separator and bag filter.

[0026] 12) The hot air from the bag filter is regulated by the air volume control valve and then connected to the induced draft fan, and then connected to the boiler exhaust gas treatment system through the induced draft fan, and discharged after being treated to meet the standards.

[0027] The thermal efficiency and hot air dust content were measured: Thermal efficiency: 97.2% Hot air dust content 42mg / Nm 3 Example

[0028] The amino acid fermentation waste liquid used in the present invention is the fermentation liquid for producing amino acids by biological fermentation, and the fermentation waste liquid is generated after the amino acids are extracted; taking Example 1 as an example, the technical indicators of the finished fertilizer are shown in Table 1: Table 1 Serial number Finished Product Item Category (Dry Basis) Technical indicators 1 Total nitrogen (N) ≥ % 35-45 2 Organic matter ≥ % 35-45 3 pH 3-4 4 Moisture ≤ % 3-4 Although the above describes the specific implementation methods of the present invention in combination with the embodiments, it is not intended to limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that various modifications or variations that can be made by technical personnel in the field without creative work on the basis of the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A method for treating lysine fermentation wastewater and waste gas, comprising the following steps: Step 1) adding materials, step 2) drying in a drying tower, step 3) secondary drying, step 4) gas deodorization.

2. The method according to claim 1, characterized in that: The method comprises the following steps: Step 1) Adding materials: Store the wastewater in a slurry storage tank, add humic acid, urea, and monoammonium phosphate, stir evenly, and then atomize and granulate; Step 2) Drying in a drying tower: the atomized fertilizer in step 1) is put into a drying tower for drying to obtain dry fertilizer and dry waste gas; Step 3) secondary drying: connecting the dried fertilizer in step 2) to a cyclone separator for secondary drying to obtain separated fertilizer and separated waste gas; Step 4) Gas deodorization: The dried waste gas from step 2), the separated waste gas from step 3) and the dust-removed waste gas are cooled, and then filtered through a primary filter to obtain filtered air.

3. The method according to claim 2, characterized in that The feed solution is prepared according to the following process: Urea, monoammonium phosphate, potassium humate and zeolite powder were put into a feed tank in a mass ratio of 3:2:1:1, mixed evenly to obtain a mixture, and then the same mass of amino acid fermentation waste liquid was added and stirred evenly to obtain a feed liquid.