Carbon emission reduction treatment method for organic sewage

Abstract

The invention relates to a carbon emission reduction treatment method for organic sewage, which comprises the following steps: step 1, introducing organic sewage from which floaters are removed through a grating pool into a uniform mixing pool, adding a microorganism trapping agent and an auxiliary agent into the uniform mixing pool in proportion, adjusting the pH value, and performing intermittent stirring and mixing; 2, enabling the mixed liquid stirred and mixed in the uniform mixing tank to flow into a still water sedimentation tank, standing, and settling and separating the microorganism trapping agent after trapping the organic matters; and 3, discharging the supernatant of the still water sedimentation tank after reaching the standard, or introducing the supernatant which does not reach the standard into a subsequent integrated treatment tank or an aeration tank and an anaerobic tank for continuous treatment, and finally discharging after reaching the standard. 4, sediment at the bottom of the still water sedimentation tank is taken out for composting fermentation or biogas fermentation. According to the invention, the raw sewage is directly treated by the microbial trapping agent, so that part or all of organic matters can be directly captured, the sewage is purified, the waste carbon emission is eliminated or reduced, the kinetic energy is saved, and energy conservation and emission reduction are realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment equipment and relates to a method for carbon emission reduction treatment of organic sewage. Background Art

[0002] Since the beginning of the last century, the main technology for treating sewage has been biological treatment technology, which originated from the discovery of activated sludge for purifying sewage in 1913. After continuous improvement, various biochemical sewage treatment processes dominated by activated sludge have been developed, such as anaerobic activated sludge treatment technology and aerobic activated pollution treatment technology. Its main principle is: through aerobic or anaerobic microbial flora and protozoa in the sludge, the organic matter in the sewage is digested and degraded, most of which form CO2 or biogas, and a small part of the organic matter and inorganic matter are transformed into cell bodies. The emergence of activated sludge treatment technology has played a very positive role in promoting the development of wastewater treatment technology. However, with the wide application of this technology, its disadvantages have also become obvious. The main problems are: 1. In the process of treating organic wastewater with the activated sludge technology mainly based on microorganisms, the organic matter in the wastewater is degraded and CO2 is discharged, and these organic matters cannot be recycled, which not only consumes a large amount of energy but also loses valuable organic resources. 2. In the advanced treatment of domestic wastewater and other wastewater rich in organic matter, activated sludge not only degrades the valuable organic matter in the wastewater, but also turns into a large amount of excess sludge due to the self-proliferation of microbial cells. Its fertilizer efficiency is low and it is difficult to recycle. 3. When treating organic wastewater, since it mainly relies on microorganisms to degrade organic matter, small molecular organic matter that is easily soluble but difficult to degrade and new nitrogen-containing compounds are generated in the tail water, resulting in that COD often fails to meet the standard. 4. During the operation of the sewage treatment plant, a large amount of kinetic energy is also consumed, which leads to a high indirect carbon emission. Therefore, it is necessary to change the activated sludge treatment technology for treating sewage rich in organic matter such as urban domestic sewage, fermentation sewage, and slaughter sewage.

[0003] Wastewater treatment technologies are mainly divided into physical treatment technologies, chemical treatment technologies, and biological treatment technologies according to the treatment methods. Physical treatment technologies mainly carry out physical treatment according to the physical properties of pollutants in the wastewater. For example, static sedimentation is used to treat solids in the wastewater, optical methods are used to treat some light-sensitive pollutants, and adsorbents are added to treat some water-soluble pollutants. Chemical treatment technologies are wastewater treatment methods developed mainly according to the chemical properties of pollutants. The pollutants react with the added chemical substances for precipitation or decomposition, which can effectively remove some pollutants in the wastewater. Physical methods and chemical methods are very effective for treating single-pollution wastewater, and the treatment processes are relatively simple and quite mature. However, for composite pollution wastewater, physical treatment technologies and chemical treatment technologies are powerless and need to be used in combination with other relevant technologies.

[0004] The capturer, also known as the super biosorbent, is a microorganism cell obtained through directional breeding and ultraviolet mutagenesis. It can efficiently adsorb organic matter and ions in wastewater and has performance equal to or exceeding that of general adsorbents or flocculants. Bacillus subtilis ZN0871v11 of CN2012102913392 is a mutant strain of the developed capturer. It can directly treat the raw water of printing and dyeing wastewater, efficiently adsorb or even completely capture the organic matter molecules and ions in the wastewater within 5 - 10 minutes, and reduce the COD and ion concentration to the standard. The capturer cells that have captured organic matter and ions can be regenerated within 3 - 30 minutes using 6 kinds of regeneration eluents, with high regeneration efficiency, low cost, and no pollution. Through regeneration, the capturer can be recycled repeatedly. The soluble pollutants eluted can also be easily reused. For example, those with high value can be recovered, and the others can be used for composting, biogas fermentation, etc.

[0005] The main principle of the capturer wastewater treatment technology is as follows: Through screening or mutagenesis breeding, the number of charged groups and hydrophilic groups on the cell wall of Bacillus subtilis ZN0871v11 increases. In a weakly acidic solution, the cells carry a positive charge, and the groups with positive and negative charges and hydrophilic groups on the cell surface can all have electrostatic attraction, hydrophilic interaction and other forces with the counter-charge ions or polar molecules in the aqueous solution, adsorbing the anions and cations in the solution to the cell surface. After these ions or groups are adsorbed on the surface, they continue to act through the remaining charge or polarity with the opposite charge, thus forming an interactive attraction chain between positive and negative charges, forming layer-by-layer accumulation, resulting in a decrease in the number or intensity of free ions in the wastewater, a gradual decrease in the charge on the cell surface, and an increase and aggregation of cell particles, thus forming co-sedimentation. Coupled with the dense mesh holes of the cell wall peptidoglycan and the small size of the cell particles themselves, the comprehensive effect of the adsorption effect is enhanced, and the speed of co-sedimentation is accelerated. In the presence of some ions, especially the presence of Cu 2+ 、Fe 2+ and Cl - etc. can accelerate the process of electrostatic attraction and co-sedimentation, rather than inhibiting the adsorption or repulsion.

[0006] In addition to the Bacillus subtilis ZN0871v11 mutant strain, multiple strains of microbial cells that act as scavengers under neutral and alkaline conditions have been developed, including more than 10 types of bacteria and actinomycetes, forming a combined group to adapt to different water quality treatment environments. Although the technology of using super bioabsorbents to treat sewage is also a type of biological treatment technology, it has great advantages compared with activated sludge treatment. It has a fast speed of capturing organic matter, simple required equipment and operating conditions, has no special requirements for equipment and the use environment, and the used scavenger can be eluted with a little eluent and recycled, greatly reducing costs. It has the advantages of high adsorption efficiency, rapid treatment, short and concise process flow, easy regeneration, high recovery efficiency, wide adaptability, recycling of organic matter and reduction of carbon emissions, overcomes the disadvantages and problems of existing wastewater treatment processes, and is the development direction of new technologies for carbon emission reduction in sewage treatment today. Using the developed combined group of multiple microbial cells as scavengers to treat organic sewage such as urban domestic sewage, antibiotic fermentation industrial sewage, and slaughter wastewater, the components of this type of sewage are extremely complex, highly variable, and have a high COD. Using traditional microbial degradation methods will result in wasted carbon emissions. By directly treating the raw sewage with the combined group of scavengers, some or all of the organic matter can be directly captured to purify the sewage. Summary of the Invention

[0007] The object of the present invention is to provide a method for carbon emission reduction treatment of organic sewage in order to better treat organic wastewater such as urban domestic sewage, antibiotic fermentation industrial sewage, and slaughter wastewater. Through direct treatment of the raw sewage with a microbial scavenger, some or all of the organic matter can be directly captured to purify the sewage, achieving the elimination or reduction of "wasted" carbon emissions, saving kinetic energy, and realizing energy conservation and emission reduction.

[0008] The technical solution of the present invention is as follows: A method for carbon emission reduction treatment of organic sewage, characterized by including the following steps: Step 1: Connect the organic sewage from which floating substances have been removed by a grid tank to a mixing tank. A microbial scavenger and an auxiliary agent are added to the mixing tank in proportion, and the pH value is adjusted, and intermittent stirring and mixing are carried out; Step 2: The mixed liquid obtained by stirring and mixing in the mixing tank flows into a static sedimentation tank, and the microbial scavenger after capturing the organic matter is allowed to settle and separate by standing; Step 3: The supernatant of the static sedimentation tank is discharged up to standard, or the unqualified supernatant is introduced into a subsequent integrated treatment tank, aeration tank, or anaerobic tank for further treatment until it is discharged up to standard; Step 4: The sediment at the bottom of the static sedimentation tank is taken out for composting fermentation or biogas fermentation.

[0009] In Step 1, the dosage of the microbial capturer added to the mixing tank is 0.1 - 10% of the amount of organic sewage, the dosage of the auxiliary agent added is 0.001 - 0.02% of the COD amount of the organic sewage, and the pH value is adjusted to 5 - 9.

[0010] The microbial capturer is a microbial cell population cultured in a microbial culture tank. The microbial cell population includes a mutant strain v11 of Bacillus subtilis, a Bacillus megaterium with adsorption ability, Rhodotorula, a bacterium capable of degrading surfactants, and an actinomycete capable of degrading white emulsion. The inoculation amount of each strain is 0.1 - 20%. The temperature control range in the microbial culture tank is 20 - 40°C. Using domestic sewage, etc., the microbial cell population is cultured for 3 - 10 hours to reach a cell density of 10 8-10 cells / mL.

[0011] The microbial culture tank includes a tank body, six groups of electric heating tubes, a stirrer, and a PID temperature control system; there are an inlet pipe with a valve and an outlet pipe with a valve on the tank body. The six groups of electric heating tubes are distributed in a triangular pattern at the bottom of the tank body to conform to the circulating flow of stirring, facilitate heat transfer, and reduce mutual interference. The power of each group of electric heating tubes is adjustable from 50 - 20 kW; the PID temperature control system includes a temperature sensor, a controller, and a variable frequency driver. The temperature sensor is embedded in the side wall of the tank body to feedback the water temperature to the controller in real time. The controller adjusts the power of each group of electric heating tubes through the variable frequency driver; a stirrer is installed in the center of the tank body, with a power of 0.55 - 50 kw. The main shaft of the propeller of the stirrer forms an angle of 30 - 60° with the ground. This angle can reduce the liquid resistance of stirring and increase the dissolved oxygen; the inner lining of the tank body is a 316L stainless steel layer, and the outer wall is coated with a fluorine-containing coating.

[0012] The distance between adjacent electric heating tubes is 150 mm, arranged in a matrix pattern, and each group of electric heating tubes is equipped with an independent overcurrent protection module; the temperature control accuracy of the PID temperature control system is ±1°C, and the response time ≤ 5 seconds; the top cover of the tank body is provided with an anti-fog glass observation window, and a maintenance door is opened on the side wall.

[0013] Two propeller stirrers, a Taiji diagram diversion structure, and a PLC control system are installed in the mixing tank; the Taiji diagram diversion structure is located at the bottom of the mixing tank body. The Taiji diagram diversion structure is two fish-shaped diversion plates rotating in opposite directions, forming a circulating flow in the shape of the two fish of the Taiji diagram; the two propeller stirrers are respectively installed on the fish eyes of the fish-shaped diversion plates of the Taiji diagram diversion structure in the tank body, with a power adjustable from 0.55 - 50 kW, and the blade angle is of an adjustable design; the PLC control system installed on the tank body is respectively connected to the two propeller stirrers and the liquid level sensor installed on the side wall of the tank body, and automatically adjusts the stirring frequency according to the liquid level height in the mixing tank.

[0014] The blades of the propeller agitator are made of 304 stainless steel, and the surface is sprayed with a tungsten carbide wear-resistant layer; a partition wall or partition board is provided between the two fish-shaped guide plates; and the height of the partition wall or partition board is 5-50 cm.

[0015] The static sedimentation tank is provided with a partitioned sedimentation device. A number of detachable nylon membrane partition walls are vertically arranged inside the static sedimentation tank, and gaps are left between adjacent detachable nylon membrane partition walls to form a multi-stage sedimentation channel.

[0016] The height of the detachable nylon membrane partition wall ≤ the height of the static sedimentation tank, and the distance between adjacent detachable nylon membrane partition walls is 5-20 cm.

[0017] The detachable nylon membrane partition wall is fixed in the static sedimentation tank by a snap-fastening method. The single-person disassembly time ≤ 30 seconds, and the flow velocity gradient of the multi-stage sedimentation channel is designed to decrease gradually at 0.1-0.5 m / s.

[0018] Through the treatment process from the mixing tank to the static sedimentation tank, the method of the present invention can remove most or a higher proportion of organic matter, which not only greatly reduces the pressure of subsequent activated sludge treatment, but also reduces the carbon emissions directly generated by microbial degradation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a block flow chart of the present invention.

[0020] Figure 2a 、 Figure 2b They are respectively schematic structural diagrams of the microbial culture tank of the present invention.

[0021] Figure 3a 、 Figure 3b It is a schematic structural diagram of the mixing tank of the present invention.

[0022] Figure 4a 、 Figure 4b 、 Figure 4c It is a schematic structural diagram of the static sedimentation tank of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0023] The present invention will be further described in conjunction with the accompanying drawings and embodiments.

[0024] As Figure 1 shown, an organic sewage carbon emission reduction treatment method is characterized by including the following steps: Step 1: Connect the organic sewage that has removed floating substances through the grid tank into the mixing tank. A microbial capture agent and an auxiliary agent are added to the mixing tank in proportion, and the pH value is adjusted, and intermittent stirring and mixing are carried out. Step 2: The mixed liquid stirred and mixed in the mixing tank flows into the static sedimentation tank, and stands still to make the microbial capture agent that has captured organic matter settle and separate. Step 3: The supernatant of the static sedimentation tank is discharged up to standard, or the non-compliant supernatant is introduced into the subsequent integrated treatment tank, aeration tank or anaerobic tank for further treatment and finally discharged up to standard; Step 4: The sediment at the bottom of the static sedimentation tank is taken out for compost fermentation or biogas fermentation.

[0025] In Step 1, the dosage of the microbial capturer added to the mixing tank is 0.1 - 10% of the organic sewage volume, and the dosage of the auxiliary agent added is 0.001 - 0.02% of the organic sewage COD amount, and the pH value is adjusted to 5 - 9.

[0026] The microbial capturer is composed of microbial flora cells cultured in a microbial culture tank. The microbial cell flora includes Bacillus subtilis mutant v11, Bacillus megaterium with adsorption ability, Rhodotorula, bacteria capable of degrading surfactants, and actinomycetes capable of degrading white emulsion, etc. The inoculation amount of each strain is 0.1 - 20%. The temperature control range in the microbial culture tank is 20 - 40°C, and the microbial cell population is cultured for 3 - 10 hours using domestic sewage, etc. to reach a cell density of 10 8-10 cells / mL. The Bacillus subtilis mutant v11 of the present invention is the mutant ZN0871v11 described in Patent No. 2012102913392, Bacillus megaterium with adsorption ability, Pseudomonas putida capable of degrading surfactants ( Pseudomonas Putida ) and Nocardiopsis alba capable of degrading white emulsion ( Nocardiopsis alba ).

[0027] Such as Figure 2a 、 Figure 2bAs shown in the figure, the microbial culture tank includes a tank body, six groups of electric heating tubes, a stirrer, and a PID temperature control system; a water inlet pipe 12 with a valve and a water outlet pipe 13 with a valve are provided on the tank body 1, and it includes the tank body 1, six groups of electric heating tubes 2, a stirrer 14, and a PID temperature control system 3; the six groups of electric heating tubes 2 are distributed in a product shape at the bottom of the tank body 1 to conform to the circulating flow of the stirring, facilitate heat transfer, and reduce mutual interference. The power of each group of electric heating tubes 2 is adjustable from 50 to 20 kW; the PID temperature control system 3 includes a temperature sensor 4, a controller 5, and a variable frequency driver 6. The temperature sensor 4 is embedded in the side wall of the tank body 1 and feeds back the water temperature to the controller 5 in real time. The controller 5 adjusts the power of each group of electric heating tubes 2 through the variable frequency driver 6; a stirrer 14 is installed in the center of the tank body 1 through two mounting columns 15, with a power of 0.55 - 50 kw. The propeller main shaft of the stirrer 14 forms an angle of 30 - 60° with the ground. The stirrer 14 is used to mix the liquid to transfer heat and accelerate the growth and reproduction of microorganisms. When the angle of 30 - 60° is set for stirring, the resistance received is less than that of the propeller installed vertically, and it can also increase the dissolved oxygen; the inner lining of the tank body 1 is a 316L stainless steel layer 7, and the outer wall is coated with a fluorine-containing coating 8; the distance between adjacent electric heating tubes 2 is 150 mm, arranged in a matrix, and each group of electric heating tubes 2 is equipped with an independent overcurrent protection module 9. The temperature control accuracy of the PID temperature control system 3 is ±1°C, and the response time ≤ 5 seconds. The top cover 16 of the tank body 1 is provided with an anti-fog glass observation window 10, and a maintenance door 11 is opened on the side wall. The shape of the tank body 1 is square as Figure 2a shown, and of course, it can also be circular as Figure 2b shown.

[0028] Such as Figure 3a 、 Figure 3bAs shown, two propeller agitators 3-1, a Taiji diagram flow guiding structure 3-2, and a PLC control system 3-3 are installed in the mixing tank; the Taiji diagram flow guiding structure 3-2 is arranged at the bottom of the mixing tank body 3-4. The Taiji diagram flow guiding structure 3-2 is arranged at the bottom of the tank body 3-4 and is two fish-shaped flow guiding plates 3-5 rotating in opposite directions. The height of the partition wall or partition board between the fish-shaped flow guiding plates 3-5 is 5-50 cm to form a Taiji diagram double-fish-shaped circulation during propeller agitation; the two propeller agitators 1 are respectively installed on the fish eyes of the fish-shaped flow guiding plates 3-5 of the Taiji diagram flow guiding structure 3-2 of the tank body 3-4, with an adjustable power of 0.55-50 kW and an adjustable blade angle design; the PLC control system 3-3 installed on the tank body 4 is respectively connected to the two propeller agitators 3-1 and the liquid level sensor 3-6 installed on the side wall of the tank body 3-4 to automatically adjust the agitation frequency according to the liquid level height in the mixing tank. The blades of the propeller agitator 3-1 are made of 304 stainless steel and are sprayed with a tungsten carbide wear-resistant layer on the surface. The tank body 3-4 is provided with a water outlet pipe 3-7, an auxiliary agent and acid-base liquid inlet pipe 3-8 with a control valve 3-9, a microbial flora culture solution inlet pipe 3-10 with a control valve 3-9, and a raw water inlet pipe 3-11 with a control valve 3-9. The two propeller agitators 3-1 are respectively installed on the fish eyes of the fish-shaped flow guiding plates 3-5 of the Taiji diagram flow guiding structure 3-2 of the tank body 3-4 to stir the water flow into a double-fish shape of the Taiji diagram. This liquid flow direction can strengthen entanglement, increase the probability of contact and collision, and improve the effect of convection / adsorption. The switches of various inlet pipes of the mixing tank are designed as intelligent control switches and are respectively connected to the PLC control system 3-3, which is beneficial to adjusting the water level of the mixing tank. The mixing tank body 3-4 is a cube as Figure 3a , and the mixing tank body 3-4 is a cylinder as Figure 3b shown.

[0029] Such as Figure 4aAs shown in the figure, the still water sedimentation tank is square. There is an inlet pipe 4-4 at the bottom of one side of the still water sedimentation tank, and an outlet pipe 4-5 at the upper part of the other side. Its characteristics are as follows: it includes several detachable nylon membrane partition walls 4-1 and multi-stage sedimentation channels 4-2; several detachable nylon membrane partition walls 4-1 are respectively fixed inside the still water sedimentation tank 4-3 by snap-fastening methods, and there are gaps between adjacent detachable nylon membrane partition walls 4-1, forming multi-stage sedimentation channels 4-2. The height of the detachable nylon membrane partition wall 4-1 ≤ the height of the still water sedimentation tank; the distance between adjacent detachable nylon membrane partition walls 4-1 is 5-20 cm. The velocity gradient of the multi-stage sedimentation channels 4-2 is designed to decrease gradually at 0.1-0.5 m / s. The single-person disassembly time of the detachable nylon membrane partition wall 4-1 ≤ 30 seconds. The height of the outlet pipe 4-5 is 1.2 meters. The mixed liquid enters from the edge of the still water sedimentation tank, and the mixed water body is slowly introduced. The water flow flows outwards along the multi-stage sedimentation channels of the detachable nylon membrane partition wall. During the flowing process, the particles adsorbed with organic matters and ions continuously precipitate. The slow flow rate is beneficial to precipitation and is beneficial to the separation of solid-liquid two phases. Let the supernatant flow out from the outlet pipe. The opening position of the outlet pipe should be relatively high, at 1.2 meters, to avoid the outflow of sediment. After more sediments accumulate, the fence can be taken out to clean the sediments, or the sediments can be pumped out with a siphon pump. After cleaning, a new round of sewage treatment can be carried out.

[0030] As Figure 4b shown, except that the shape of the still water sedimentation tank 4-3 is oval and the installation of the detachable nylon membrane partition walls 4-1 forms an oval shape differently, the other installation structures are the same as those of the above-mentioned square still water sedimentation tank. The inlet pipe of the mixed liquid is relatively long and extends from the edge of the still water sedimentation tank to the center of the tank. Therefore, the inlet pipe can be suspended and extended to slowly introduce the mixed water body. The water flow flows outwards along the annular multi-stage sedimentation channels of the detachable nylon membrane partition wall. During the flowing process, the particles adsorbed with organic matters and ions continuously precipitate. The slow flow rate is beneficial to precipitation and is beneficial to the separation of solid-liquid two phases. Let the supernatant flow out from the outlet pipe. The opening position of the outlet pipe should be relatively high, at 1.2 meters, to avoid the outflow of sediment. After more sediments accumulate, the fence can be taken out to clean the sediments, or the sediments can be pumped out with a siphon pump. After cleaning, a new round of sewage treatment can be carried out.

[0031] As Figure 4cAs shown, except that the installation shape of the detachable nylon membrane partition wall 4-1 is the same as that of the elliptical static sedimentation tank 4-3, the others are the same as the installation structure of the above-mentioned square static sedimentation tank. The influent pipe of the mixed liquid is relatively long and extends from the edge of the static sedimentation tank to the center of the tank. Therefore, the influent pipe can extend in the air, allowing the mixed water body to be slowly introduced. The water flow flows outward along the annular multi-stage sedimentation channel of the detachable nylon membrane partition wall. During the flowing process, the particles adsorbed with organic matter and ions continuously settle down. The slow flow rate is beneficial to sedimentation and the separation of solid and liquid phases. Let the supernatant flow out from the effluent pipe. The opening position of the effluent pipe should be relatively high, at 1.2 meters, to avoid the outflow of sediment. After more sediment accumulates, the fence can be removed to clean out the sediment, or the sediment can be pumped out with a siphon pump. After cleaning, a new round of sewage treatment can be carried out.

[0032] Case 1: The sewage in the highway service area contains catering kitchen wastewater and washroom wastewater, which is high in grease, protein, salt, and also contains feces, detergents, etc. The composition is very complex and fluctuates greatly. The COD ranges from several hundred to over 30,000 mg / L. Using the traditional activated sludge microbial oxidation and decomposition treatment technology will produce a large amount of greenhouse gases such as CO2, and the treatment time is long and it is difficult to meet the tail water standard. Using the method of the present invention, a grille tank with a daily sewage treatment capacity of 500 tons / day, a 20-cubic-meter microbial culture tank, a 50-cubic-meter mixing tank, a 100-cubic-meter static sedimentation tank, and an integrated treatment tank were built. After treatment, the raw water of the high-COD organic sewage enters the grille tank, mixing tank, and static sedimentation tank of the present invention. After two-step treatment in the mixing tank and the static sedimentation tank, the COD is reduced to below 300 mg / L. Then, through the degradation of the activated sludge in the integrated treatment tank, the tail water meets the standard. The sediment transferred from the static sedimentation tank is used for compost fermentation to produce organic fertilizer or produce biogas. The direct carbon emission reduction efficiency reaches about 70%. In this Case 1, the inoculation amount of each strain in the microbial culture tank is 0.1%. The temperature control range in the microbial culture tank is 20 °C. Using domestic sewage to culture the microbial cell flora reaches a cell density of 10 8 cells / mL in 10 hours. The microbial cell flora is composed of a mutant strain v11 of Bacillus subtilis, Bacillus megaterium with adsorption ability, Rhodotorula, Pseudomonas putida that can degrade surfactants, and Nocardioides alba that can degrade white emulsion. The internal microbial capture dose added to the mixing tank is 10% of the amount of organic sewage, and the auxiliary dose mixed according to ferrous sulfate: ferrous chloride of 1:1 is 0.02% of the COD amount of the organic sewage, and the pH value is adjusted to 9.

[0033] Case 2 The sewage from highway toll stations mainly includes washroom sewage, washing wastewater and catering kitchen waste water, which contains feces, detergents, and also contains complex components such as high levels of grease, protein, and salt, with large fluctuations. The COD ranges from several hundred to over 20,000 mg / L. Using traditional activated sludge microbial oxidation and decomposition treatment technologies will produce a large amount of greenhouse gases such as CO2, and the treatment time is long and it is difficult to meet the standards for the tail water. By using the method of the present invention, a grille tank with a daily treatment capacity of 100 tons / day, a 20-cubic-meter microbial culture tank, a 40-cubic-meter mixing pool, an 80-cubic-meter static sedimentation tank and an integrated treatment tank were built. After treatment, the raw sewage with high COD enters the grille tank, mixing pool, and static sedimentation tank for treatment. After two-step treatment in the mixing and stirring pool and the static sedimentation tank, the COD is reduced to below 300 mg / L. Then, through the degradation of the activated sludge in the integrated treatment tank, the tail water meets the standards. The sediment transferred from the static sedimentation tank is used for compost fermentation to produce organic fertilizer or produce biogas. The direct carbon emission reduction efficiency reaches about 60%. In this Case 2, the inoculation amount of each strain in the microbial culture tank is 10%. The temperature control range in the microbial culture tank is 40°C. The microbial cell flora is cultured using domestic sewage and reaches a cell density of 10 9 cells / mL in 5 hours. The microbial cell flora is composed of a mutant strain v11 of Bacillus subtilis, Bacillus megaterium with adsorption ability, Rhodotorula, Pseudomonas putida that can degrade surfactants, and Nocardioides albus that can degrade white emulsion. The dosage of the internal microbial capture agent added to the mixing pool is 0.1% of the amount of organic sewage, and the dosage of the auxiliary agent mixed at a ratio of ferric sulfate: ammonium ferrous sulfate of 1:1 is 0.001% of the COD of the organic sewage, and the pH value is adjusted to 5.

[0034] Case 3: The domestic sewage in the university campus mainly contains washing sewage, feces, washing wastewater and catering kitchen waste wastewater, which contains not only detergents and feces, but also high levels of grease, protein, salt, cosmetics and other components, and is very complex. The components and concentrations are extremely unstable, with large fluctuations. The COD ranges from several hundred to over 35,000 mg / L. Using ordinary traditional activated sludge microbial oxidation and decomposition treatment technology will produce a large amount of greenhouse gases such as CO2, and the treatment time is long and it is difficult to meet the standards for the tail water. By using the method of the present invention, a grille tank with a daily treatment capacity of 5,000 tons / day, a 20-cubic-meter microbial culture tank, a 100-cubic-meter mixing pool, a 1,000-cubic-meter static sedimentation tank and an integrated treatment tank are built. After treatment, the raw sewage with high COD enters the treatment system. After two-step treatment in the mixing pool and the static sedimentation tank, the COD is reduced to below 300 mg / L. Then, through the degradation of activated sludge in the integrated treatment tank, the tail water meets the standards. The sediment transferred from the static sedimentation tank is used for compost fermentation to produce organic fertilizer or produce biogas. The direct carbon emission reduction efficiency reaches about 65%. In this Case 3, the inoculation amount of each strain in the microbial culture tank is 20%, and the temperature control range in the microbial culture tank is 30°C. Using domestic sewage to culture the microbial cell flora reaches a cell density of 10 10 cells / mL in 3 hours. The microbial cell flora is composed of a mutant strain v11 of Bacillus subtilis, Bacillus megaterium with adsorption ability, Rhodotorula, Pseudomonas putida that can degrade surfactants, and Nocardiopsis alba that can degrade white emulsion. The internal microbial capture dose added to the mixing pool is 5% of the organic sewage volume, and the auxiliary dose of ferrous sulfate is 0.01% of the organic sewage COD. The pH value is adjusted to 7.

Claims

1. A method for reducing carbon emissions from organic wastewater, characterized in that The following steps are involved: Step 1: The organic sewage from which floating objects have been removed by the screen tank is connected to a mixing tank, in which microbial capture agents and auxiliary agents are added in proportion, and the pH value is adjusted, and intermittent stirring and mixing is performed; Step 2: The mixed liquid stirred in the mixing tank flows into the static water sedimentation tank and is left to stand to allow the microbial capture agent that has captured the organic matter to settle and separate; Step 3: The supernatant from the static water sedimentation tank meets the discharge standards, or the supernatant that does not meet the standards is introduced into the subsequent integrated treatment tank or aeration tank and anaerobic tank for further treatment, and finally meets the discharge standards; Step 4: The sediment at the bottom of the static water sedimentation tank is removed for composting or biogas fermentation.

2. The method for reducing carbon emissions from organic wastewater according to claim 1, characterized in that: In step 1, the amount of microorganism capture added to the mixing tank is 0.1-10% of the amount of organic sewage, the amount of auxiliary added is 0.001-0.02% of the COD amount of organic sewage, and the pH value is adjusted to 5-9.

3. The method for reducing carbon emissions from organic wastewater according to claim 1, characterized in that: The microorganism capture agent is a microorganism cell flora cultured in a microorganism culture pool, and the microorganism cell flora includes a mutant strain of Bacillus subtilis v11, Bacillus megaterium with adsorption capacity, red yeast, bacteria capable of degrading surfactants, and actinomycetes capable of degrading white latex. The inoculation amount of each strain is 0.1-20%. The microorganism cell flora is cultured in a microorganism culture pool at a temperature range of 20-40°C, and the cell density reaches 10 in 3-10 hours by using domestic sewage. 8-10 Pieces / mL.

4. The method for reducing carbon emissions from organic wastewater according to claim 3, characterized in that: The microorganism culture tank comprises a tank body, six groups of electric heating tubes, an agitator and a PID temperature control system; the tank body is provided with a water inlet pipe with a valve and a water outlet pipe with a valve, the six groups of electric heating tubes are distributed in a finished product shape at the bottom of the tank body to conform to the stirring circulation, facilitate heat transfer and reduce mutual interference, and the power of each group of electric heating tubes is adjustable from 50 to 20 kW; the PID temperature control system comprises a temperature sensor, a controller and a frequency conversion drive, the temperature sensor is embedded in the side wall of the tank body, and the water temperature is fed back to the controller in real time, and the controller adjusts the power of each group of electric heating tubes through the frequency conversion drive; an agitator is installed in the center of the tank body, with a power of 0.55-50 kW, and the propeller main shaft of the agitator forms an angle of 30-60° with the ground, and this angle can reduce the liquid resistance of stirring and increase dissolved oxygen; the tank body is lined with a 316L stainless steel layer, and the outer wall is coated with a fluorocarbon coating.

5. The method for reducing carbon emissions from organic wastewater according to claim 4, characterized in that: The spacing between adjacent electric heating tubes is 150mm, and they are arranged in a matrix. Each group of electric heating tubes is equipped with an independent overcurrent protection module. The temperature control accuracy of the PID temperature control system is ±1°C, and the response time is ≤5 seconds. The top cover of the pool body is provided with a fog-proof glass observation window, and an inspection door is opened on the side wall.

6. The method for reducing carbon emissions from organic wastewater according to claim 1, characterized in that: Two propeller agitators, a Tai Chi diagram flow guide structure and a PLC control system are installed in the mixing tank; the Tai Chi diagram flow guide structure is arranged at the bottom of the mixing tank body, and the Tai Chi diagram flow guide structure is two counter-rotating fish-shaped flow guide plates, forming a Tai Chi diagram double fish-shaped circulation; the two propeller agitators are respectively installed on the fish eyes of the fish-shaped flow guide plates of the Tai Chi diagram flow guide structure of the tank body, the power is adjustable from 0.55 to 50kW, and the blade angle is an adjustable design; the PLC control system installed on the tank body is respectively connected to the two propeller agitators and the liquid level sensor installed on the side wall of the tank body, and automatically adjusts the stirring frequency according to the liquid level height in the mixing tank.

7. The method for reducing carbon emissions from organic wastewater according to claim 6, characterized in that: The propeller agitator blades are made of 304 stainless steel, and a tungsten carbide wear-resistant layer is sprayed on the surface; a partition wall or partition plate is arranged between the two fish-shaped guide plates; and the height of the partition wall or partition plate is 5-50 cm.

8. The method for reducing carbon emissions from organic wastewater according to claim 1, characterized in that: The static water sedimentation tank is provided with a partitioned sedimentation device. A plurality of vertical detachable nylon membrane partition walls are arranged inside the static water sedimentation tank, and gaps are left between adjacent detachable nylon membrane partition walls to form a multi-stage sedimentation channel.

9. The method for reducing carbon emissions from organic wastewater according to claim 8, characterized in that: The height of the detachable nylon membrane partition wall is ≤ the height of the static water sedimentation tank, and the distance between adjacent detachable nylon membrane partition walls is 5-20 cm.

10. The method for reducing carbon emissions from organic wastewater according to claim 8, characterized in that: The removable nylon membrane partition wall is fixed in the static water sedimentation tank by snap-fitting. The disassembly time for one person is ≤30 seconds. The flow velocity gradient of the multi-stage sedimentation channel is designed to decrease step by step from 0.1 to 0.5 m / s.

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