CN111995204A - Sludge reduction method adopting high-purity pure oxygen combined with microbial treatment - Google Patents
Sludge reduction method adopting high-purity pure oxygen combined with microbial treatment Download PDFInfo
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Abstract
The invention provides a sludge reduction method adopting high-purity pure oxygen combined with microbial treatment, which comprises the following steps: the pump conveying equipment adopts a high-pressure capillary technology to completely dissolve pure oxygen with the oxygen concentration of more than 99 percent into the sludge wastewater mixed liquid in a molecular form, so that bubble-free conveying is realized, and large-flow super dissolved oxygen (SSO) is generated2(ii) a Under the action of super dissolved oxygen, aerobic microorganisms are utilized to degrade organic substances in the sludge-wastewater mixed liquor, wherein the microorganism sources comprise microorganisms and increased microorganism strains in the sludge-wastewater mixed liquor. The invention adopts a method of combining high-purity pure oxygen and microorganisms to reduce the organic matrix in the sludge and greatly reduce the output of the excess sludge of a biochemical system, thereby really realizing sludge reduction. Solves the technical problem of secondary pollution in the sludge reduction process.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a sludge reduction method adopting high-purity pure oxygen combined with microbial treatment.
Background
Since the completion of the sludge digestion tank of the first domestic sewage treatment plant at the end of the last century, the number of sludge digestion devices constructed has increased dramatically due to the demand for environmental protection and municipal water. However, the operating technology level of the sludge digestion treatment system built in China is still relatively low so far, which requires that we must pay more attention to the research in the future practical work. More efficient processing techniques or techniques are sought.
1 status quo of sludge treatment and disposal technology in our country
1.1 disposal by landfill
After the sludge to be buried is centrifugally dewatered by high dryness, the water content of the sludge is reduced to about 65 percent, and at the moment, the dosage of a flocculating agent can be added according to the proportion of about 5 kg/tDS; after the sludge needing to be buried and treated is centrifugally dewatered, the water content of the sludge is reduced to about 80 percent, and at the moment, the dosage of the flocculating agent can be added according to the proportion of about 2.5 kg/tDS.
1.2 sludge incineration disposal
Generally, when a sludge incineration treatment process is adopted, sludge to be treated needs to be subjected to centrifugal dehydration, the water content is reduced to about 80%, the dosage of a flocculating agent is added according to the proportion of 2.5kg/tDS, and the residual ash content of the sludge after incineration is about 1/3 of the dry weight of the sludge; the incineration flue gas treatment needs the consumption of NaOH with the concentration of about 37kg/tDS (the price of NaOH is about 3450 yuan/t). In the process, the sludge transportation cost is calculated according to 0.75 yuan/(t.km) and the transportation distance of 40km, and the transportation cost is 30 yuan/t. The required landfill cost of the sludge is calculated by referring to about 15 yuan/t of the landfill operating cost of the municipal solid waste. The power consumption of each process flow is about: concentrating 25 kW.h/tDS, dehydrating 75 kW.h/tDS, digesting 150 kW.h/tDS, incinerating 200 kW.h/tDS, and charging about 0.7 yuan/(kWh.h).
According to the above calculation results, the total sludge dry solids treatment cost is about 800 yuan/t, and the sludge treatment cost of 1 ton of sewage is about 0.16 yuan/t, calculated on the basis that 1X 104 ton of sewage generates 2.0 ton of sludge. Calculated according to the cost of 0.3-0.45 yuan/t of the sewage treatment part of domestic large-scale sewage treatment plants, the cost accounts for about 35-50% of the treatment cost. Compared with the developed countries, the data has little difference in the measurement results.
1.3 sludge dewatering
At present, the common sludge dewatering mode of domestic urban sewage treatment plants is mechanical dewatering, and common mechanical dewatering equipment comprises a vacuum filter, a centrifugal dehydrator, a plate-and-frame filter press and a belt press filter. The water content of the treated sludge can only reach about 78% generally by using the most widely used belt dewaterer and centrifugal dewaterer. The sludge is treated by a plate-and-frame filter press after being conditioned by a chemical agent, and the lower limit of the water content of the sludge cake can reach below 60 percent.
1.4 anaerobic digestion
The anaerobic digestion of the sludge is a multi-stage process stage, facultative bacteria and anaerobic bacteria are utilized to carry out anaerobic biochemical reaction, organic matters in the sludge are decomposed, methane gas capable of being reused is generated, and stabilization, harmlessness and recycling of the sludge are realized. The anaerobic digestion of sludge is a commonly used sludge biological treatment method in the world at present, and is also a more economic sludge treatment method applied to large-scale sewage treatment plants. Anaerobic digestion processes are divided into two categories, direct anaerobic digestion and pretreatment + anaerobic digestion. The direct anaerobic digestion process, i.e. the traditional anaerobic digestion, is a treatment mode in which anaerobic digestion reaction is directly carried out without any pretreatment. Generally used for sludge with high organic content or mixed sludge mixed with high-concentration organic waste.
2 the development of sludge treatment and disposal technology in China
2.1 increase capital investment for sludge treatment disposal
The government and related departments need to realize the important role of sludge treatment on the daily work of a sewage treatment plant, and fundamentally strengthen the attention on the sludge treatment work and the fund investment. Governments should also adopt a variety of financing channels to ensure that sufficient funds are available to support the sludge treatment process. The government sets a corresponding preferential policy according to the actual situation of local development, attracts more enterprises to invest in sludge treatment, perfects the construction of sludge treatment infrastructure by adopting various forms such as investment, trusteeship, lease, contract and the like, and promotes the smooth operation of sludge treatment and disposal.
2.2 perfecting infrastructure construction and sludge treatment and disposal technology
At present, the construction of the infrastructure related to the sludge treatment and disposal work in China is still not sound, and related departments should perfect the construction of the infrastructure for the sludge treatment and disposal in cities and towns according to the related conditions of the sewage treatment plants in cities and towns.
The elimination, rectification, matching, perfection and the like are carried out on sludge treatment facilities, and the rationality and scientificity of sludge treatment are ensured. Meanwhile, related departments need to continuously perfect sludge treatment and disposal technologies, reasonably select and apply technologies such as deep sludge dewatering, waste heat drying and anaerobic digestion, and strengthen harmless and recycling treatment of sludge in the process of reduction and stabilization treatment of sludge. Aiming at different conditions of a sludge plant, different technologies and processes are adopted to carry out scientific and effective treatment and disposal on sludge.
2.3 further defining the safety margin of the explosion-proof zone
The determination of the explosion-proof area in the sludge digestion treatment system is very important, because the determination of the area can cause great influence on the design and construction of the overall plane arrangement, process equipment and other aspects, scientific and comprehensive layout and design are required to be carried out, the safety of the whole system construction and the operation process is improved, the explosion-proof area of the sludge digestion treatment system is defined, and a scientific and reasonable safety range is drawn. In the explosion-proof area of the biogas system, the design of related buildings and facilities must meet the requirement of grade A explosion prevention. In addition, in an explosion-proof area, the design of related buildings and facilities is implemented according to related documents formulated by related national security management departments. For example, the explosion-proof electrical equipment in the explosion-proof area conforms to the parts 9 of electrical equipment for explosive gas atmosphere in GB 3836.1-4-2000 and electrical equipment for explosive gas atmosphere in GB 3836.9-2006: and a series of files such as the cast type m and the like are required, so that the safe operation of the equipment is ensured.
2.4 enhanced supervision of sludge treatment work
Government and environmental protection departments should strengthen the supervision of sludge treatment and disposal work, effectively supervise the sludge treatment and transportation process, promote the reasonable and scientific treatment of sludge, and reduce environmental pollution and atmospheric pollution in the sludge treatment process. The act of illegally dumping or illegally disposing the sludge is stringently stricken and punished according to the related laws and regulations. The sewage treatment plant also needs to implement relevant environmental management regulation and regulation in the daily sludge treatment process, set special supervisors to carry out daily supervision and supervision on the sludge treatment process, carry out clear record and backup on the sludge treatment condition, report to the environmental protection department and related departments regularly, and carry out public and transparent management on daily sludge treatment and disposal information.
Data show that the sludge treatment modes in China mainly comprise modes of landfill, composting, natural drying, incineration and the like, and the ratios of the four treatment methods are 65%, 15%, 6% and 3% respectively. It can be seen that the sludge treatment mode in China is still mainly landfill, and in addition, the treatment capacity of the sewage treatment enterprises in cities and towns in China is insufficient, the treatment means is backward, a large amount of sludge is not treated in a standardized way, so that secondary pollution is directly caused, and the ecological environment is seriously threatened.
Disclosure of Invention
The invention provides a sludge reduction method by combining high-purity pure oxygen with microorganism treatment, which reduces organic substrates in sludge by adopting a technology of combining the high-purity pure oxygen with the microorganism and greatly reduces the yield of excess sludge of a biochemical system, thereby really realizing sludge reduction. The invention greatly reduces the operation cost of the decrement process by utilizing the pure oxygen with high purity; the efficiency of a treatment plant is greatly improved through the microbiological technology treatment; the secondary pollution problem in the sludge reduction process is avoided; the problems of efficiency and investment cost in the sludge reduction process are solved.
In order to achieve the above object, the present invention provides a method for sludge reduction using high purity pure oxygen in combination with microbial treatment, the method comprising:
step one, pure oxygen with oxygen concentration of more than 99% is completely dissolved into the sludge wastewater mixed liquid in a molecular form by adopting a high-pressure capillary technology through pump conveying equipment, so that bubble-free conveying is realized, and large-flow super-dissolved oxygen (SSO) is generated2；
Degrading organic substances in the sludge wastewater mixed liquor by using aerobic microorganisms under the action of super dissolved oxygen, wherein the microorganism sources comprise self-generated microorganisms and increased microorganism strains in the sludge wastewater mixed liquor; the increased microbial strains include:
listeria (Listeria), Thermomonospora (thermoinospora), Actinomadura (Actinomadura), pseudomonas fluorescens (p. fluoscens), neurospora crassa (n. crassa), white rot fungus (Phanerochaete), Achromobacter (Achromobacter), Alcaligenes (Alcaligenes), clostridium pasteurianum (cl. pasteurianum), bacillus megaterium (Bcillus megaterium), and archaea ammoxidation bacteria (nitrosorosphaera venensis).
In the first step, when the sludge concentration of the sludge-wastewater mixed liquor is between 1.5 and 3 percent, the introduction amount of pure oxygen is 600g for treating 1.0 ton of sludge-wastewater mixed liquor.
In the first step, the high pressure adopted in the high-pressure capillary technology is 1-2 MPa.
In the second step, the mass ratio of the increased microbial strains is as follows: listeria (Listeria): thermomomonas (Thermomonospora): madura actinomycete (Actinomadura): pseudomonas fluorescens (p. fluorescences): neurospora crassa (n.crassa): white rot fungus (Phanerochaete): achromobacter (Achromobacter): alcaligenes (Alcaligenes): clostridium pasteurianum (cl. pasteurianum): bacillus megaterium (Bcillus megaterium): ammonia oxidizing archaea (nitrosorphaera viennensis) ═ 5-12%: (7-10%): (1-5%): (10-15%): (3-8%): (10-15%): (6-12%): (1-6%): (6-12%): (9-12%): (5-10%).
In the second step, the mass ratio of the increased microbial strains is preferably: listeria (Listeria): thermomomonas (Thermomonospora): madura actinomycete (Actinomadura): pseudomonas fluorescens (p. fluorescences): neurospora crassa (n.crassa): white rot fungus (Phanerochaete): achromobacter (Achromobacter): alcaligenes (Alcaligenes): clostridium pasteurianum (cl. pasteurianum): bacillus megaterium (Bcillus megaterium): ammonia oxidizing archaea (nitrosorphaera viennensis) 10%: 8%: 4%: 12%: 5%: 15%: 10%: 6%: 12%: 9%: 9 percent.
Further, the added microbial strains are activated and domesticated by system water inlet of a corresponding biochemical system before being added, wherein the activation process conditions are as follows: the proportion of the sludge wastewater mixed liquid to the microbial strains is 100: 1;
wherein the dissolved oxygen content DO is controlled to be 4-8mg/L, the temperature is 30-35 ℃, and the pH is 7-8.5, and the reaction is continuously carried out for 6-10 hours.
Further, the adding proportion of the activated and domesticated microorganism strains to the sludge wastewater mixed liquor is 0.1-0.15%, wherein the water content in the sludge wastewater mixed liquor is 97-98%.
The invention adopts the sludge reduction technology combining the high-purity pure oxygen and the microbial technology to reduce and reduce the returned sludge of the biochemical system; the sludge of the biochemical system is decomposed and oxidized by the endogenous respiration of microorganisms under the environment of high-purity pure oxygen to be converted into carbon dioxide and water, so that the residual sludge of the biochemical system is reduced. The technology has no secondary pollutant, the yield of biochemical sludge in the municipal sewage and industrial wastewater treatment process has ideal reduction effect, compared with the prior art, the sludge reduction method adopting the combination of the high-purity pure oxygen and the microorganism can reduce the residual sludge organic matrix of the biochemical system by more than 60 percent through the sludge reduction technology combining the ultrahigh-purity pure oxygen and the microorganism, wherein the residual sludge is reduced by 50 percent or more. By using the technology, the COD removal capacity of the biochemical system can be improved by 5-30%, and the ammonia nitrogen removal capacity can be improved by 30-50%.
1. The technology can remove more than 50% of the excess sludge of the biochemical system.
2. Ultra-low energy consumption and operating cost: the operation cost is saved by more than 70 percent on average per year compared with the traditional aeration system.
3. The occupied area is small, and the movable installation is convenient: the whole system can be put into a small trailer or other mobile facilities, so that the system can meet the requirements of flow type operation, and one device can be used for treating waste water in a plurality of places, such as a plurality of lakes and ponds and river channels.
4. The deodorization effect is obvious: because the technology effectively reduces the total nitrogen, BOD and CO odor in the wastewater, including VOCs, can be controlled to a great extent correspondingly, and particularly reduces the odor containing nitrogen.
Drawings
FIG. 1 is a schematic flow diagram of a first embodiment of a method for sludge reduction using high purity pure oxygen in combination with microbial treatment according to the present invention.
Fig. 2 is a schematic diagram of the effect of a certain engineering implementation site.
FIG. 3 is a schematic diagram of the effect of mixing high purity pure oxygen with sludge before entering a biochemical system.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
As shown in fig. 1, according to one embodiment of the present invention, there is provided a sludge reduction method using high purity pure oxygen in combination with microbial treatment, the method including:
step one, pure oxygen with oxygen concentration of more than 99% is completely dissolved into the sludge wastewater mixed liquid in a molecular form by adopting a high-pressure capillary technology through pump conveying equipment, so that bubble-free conveying is realized, and large-flow super-dissolved oxygen (SSO) is generated2。
This procedure allows oxygen transfer efficiencies as high as 85-96%. Pure oxygen is completely dissolved into water in a molecular form to generate large-flow super-dissolved oxygen (SSO2), so that the oxygen can reach an ultrahigh concentration of 400mg/L or even higher in the water, and bubble-free transmission and long-time retention can be realized.
For example: the amount of excess sludge produced by one chemical wastewater biochemical treatment device per day is about 10 tons of sludge containing 85% water, namely: the method is characterized in that the excess sludge content is generated every day, the water content is about 98.5 percent and 100 tons/day, the sludge concentration of the system is maintained through excess sludge discharge, the return sludge of a secondary sedimentation tank enters a mixing device by adopting the technology, 2.5-4.0kg of pure oxygen per hour is introduced into the mixing device to be mixed with the sludge, and the DO concentration reaches 400mg/L when the return sludge enters the system. And then under the condition of supplementing compound microorganisms, according to the change of sludge concentration and the output of excess sludge per day of the system, wherein the sludge concentration of a biochemical system is maintained at the level of 4000 mg/L-4500 mg/L, the output of the excess sludge is reduced by about 50% after 1 month of debugging, and the output is reduced from the original output of 10 tons of excess sludge containing 85% of water to about 5 tons.
The molecular dissolved oxygen technology is different from the traditional aeration technology, the traditional aeration technology comprises large bubbles, small bubbles, micro bubbles and nano aeration, the molecular dissolved oxygen technology is to dissolve oxygen into water completely in a bubble-free and molecular state, the oxygen is transmitted in the water body completely without liquid film resistance, the anaerobism can be quickly inhibited, the stink can be eliminated, the oxidation reaction of easily-oxidized substances under the action of microorganisms can be directly carried out, meanwhile, the microorganisms in the water body are activated with the efficiency of more than 10 times, the black and stink of the water body can be quickly, efficiently and energy-saving, the organic bottom mud is reduced, and the sewage treatment and sludge digestion efficiency is improved. The molecular dissolved oxygen technology is completely a nano material in the dissolved oxygen technology.
Degrading organic substances in the sludge wastewater mixed liquor by using aerobic microorganisms under the action of super dissolved oxygen, wherein the microorganism sources comprise self-generated microorganisms and increased microorganism strains in the sludge wastewater mixed liquor; the increased microbial strains include:
listeria (Listeria), Thermomonospora (thermoinospora), Actinomadura (Actinomadura), pseudomonas fluorescens (p. fluoscens), neurospora crassa (n. crassa), white rot fungus (Phanerochaete), Achromobacter (Achromobacter), Alcaligenes (Alcaligenes), clostridium pasteurianum (cl. pasteurianum), bacillus megaterium (Bcillus megaterium), and archaea ammoxidation bacteria (nitrosorosphaera venensis).
Listeria (Listeria), high-temperature monad (Thermomonospora), Actinomadura (Actinomandura), pseudomonas fluorescens (P.fluorescens), rough vein bacillus (N.crassa), white rot fungi (Phanerochaete), Achromobacter (Achromobacter), Alcaligenes (Alcaligenes) and Clostridium pasteurianum (Cl.pasteurianum) have synergistic action to remove organic matters such as heavy aromatic hydrocarbon and complex carbon chain in wastewater, and can efficiently decompose organic matters and cell structure organic matters of heavy matrix components of sludge; wherein the bacillus megaterium (Bbacillus megaterium) and the ammonia oxidizing archaea (Nitrososphaera virennensis) have synergistic effect in removing nitrogen-containing organic substances and degrading ammonia nitrogen; the ammonia oxidizing archaea has the function of independently removing ammonia nitrogen.
In the first step, when the sludge concentration of the sludge-wastewater mixed liquor is between 1.5 and 3 percent, the introduction amount of pure oxygen is 600g for treating 1.0 ton of sludge-wastewater mixed liquor.
Such as: the sludge concentration is between 1.5 and 3 percent, and the pure oxygen is introduced into each ton of sludge-water mixed liquor with the amount of 0.05 to 0.06 percent, if the reflux sludge concentration of an enterprise biochemical system per day is 98 percent of water content and the reflux amount per hour is 100 tons, the pure oxygen is introduced at 5.5 kg/hour.
In the first step, the high pressure adopted in the high-pressure capillary technology is 1-2 MPa.
In the second step, the mass ratio of the increased microbial strains is as follows: listeria (Listeria): thermomomonas (Thermomonospora): madura actinomycete (Actinomadura): pseudomonas fluorescens (p. fluorescences): neurospora crassa (n.crassa): white rot fungus (Phanerochaete): achromobacter (Achromobacter): alcaligenes (Alcaligenes): clostridium pasteurianum (cl. pasteurianum): bacillus megaterium (Bcillus megaterium): ammonia oxidizing archaea (nitrosorphaera viennensis) ═ 5-12%: (7-10%): (1-5%): (10-15%): (3-8%): (10-15%): (6-12%): (1-6%): (6-12%): (9-12%): (5-10%).
In the second step, the mass ratio of the increased microbial strains is preferably: listeria (Listeria): thermomomonas (Thermomonospora): madura actinomycete (Actinomadura): pseudomonas fluorescens (p. fluorescences): neurospora crassa (n.crassa): white rot fungus (Phanerochaete): achromobacter (Achromobacter): alcaligenes (Alcaligenes): clostridium pasteurianum (cl. pasteurianum): bacillus megaterium (Bcillus megaterium): ammonia oxidizing archaea (nitrosorphaera viennensis) 10%: 8%: 4%: 12%: 5%: 15%: 10%: 6%: 12%: 9%: 9 percent.
Further, the added microbial strains are activated and domesticated by system water inlet of a corresponding biochemical system before being added, wherein the activation process conditions are as follows: the proportion of the sludge wastewater mixed liquid to the microbial strains is 100: 1; namely, 100kg of sewage is added with 1kg of the mixed strain;
wherein the dissolved oxygen content DO is controlled to be 4-8mg/L, the temperature is 30-35 ℃, and the pH is 7-8.5, and the reaction is continuously carried out for 6-10 hours.
Further, the adding proportion of the activated and domesticated microorganism strains to the sludge wastewater mixed liquor is 0.1-0.15%, wherein the water content in the sludge wastewater mixed liquor is 97-98%. Namely, 100-150kg of activated bacteria liquid needs to be supplemented every 1000 tons of sludge to be treated.
The bacterial strains are proportioned according to the performance of sludge in different industries, wherein the effective concentration of a single bacterial strain is 109/g before proportioning, and the bacterial liquid enters a system and then is rapidly analyzed with the original indigenous microbial flora of the system in a high DO state to convert the organic matrix of the sludge into carbon dioxide, water and other small molecular substances, so that the sludge yield of a biochemical system is greatly reduced.
In the embodiment I of the invention, the sludge reduction technology combining high-purity pure oxygen and microbial technology is adopted to reduce and reduce the returned sludge of the biochemical system; the sludge of the biochemical system is decomposed and oxidized by the endogenous respiration of microorganisms under the environment of high-purity pure oxygen to be converted into carbon dioxide and water, so that the residual sludge of the biochemical system is reduced. The technology has no secondary pollutant, the yield of biochemical sludge in the municipal sewage and industrial wastewater treatment process has ideal reduction effect, compared with the prior art, the sludge reduction method adopting the combination of the high-purity pure oxygen and the microorganism can reduce the residual sludge organic matrix of the biochemical system by more than 60 percent through the sludge reduction technology combining the ultrahigh-purity pure oxygen and the microorganism, wherein the residual sludge is reduced by 50 percent or more. By using the technology, the COD removal capacity of the biochemical system can be improved by 5-30%, and the ammonia nitrogen removal capacity can be improved by 30-50%.
1. The technology can remove more than 50% of the excess sludge of the biochemical system.
2. Ultra-low energy consumption and operating cost: the operation cost is saved by more than 70 percent on average per year compared with the traditional aeration system.
3. The occupied area is small, and the movable installation is convenient: the whole system can be put into a small trailer or other mobile facilities, so that the system can meet the requirements of flow type operation, and one device can be used for treating waste water in a plurality of places, such as a plurality of lakes and ponds and river channels.
4. The deodorization effect is obvious: because the technology effectively reduces the total nitrogen, BOD and CO odor in the wastewater, including VOCs, can be controlled to a great extent correspondingly, and particularly reduces the odor containing nitrogen.
The reduction ratio of the sludge in the invention and the prior art is shown in table 1:
TABLE 1
One embodiment is as follows:
firstly, analyzing the water quality of incoming water, the water content of biochemical discharged excess sludge and organic matrix: the water quality analysis comprises the following steps: the source of the water quality, such as papermaking, chemical industry types in chemical industry, pesticide and pesticide chemical industry types, and the system analyzes the main pollutant types in the water quality, the output of the excess sludge and the content of organic matrix, such as determining the output of 98% of the water content of the excess sludge per day, the large concentration percentage of the organic matrix in the sludge, such as 60% or 70% of the dry weight of the total sludge, and the like, and analyzes the cell component and the self-preparation proportion of other organic matters in the components in the organic matrix.
Secondly, generating the residual sludge amount every day;
the residual product every day is the total sludge amount which needs to be discarded after the biochemical system is made to operate, the total sludge amount is determined according to the load for removing COD, for example, the sludge amount of each 1.0kg/COD removed by a normal biochemical system is 0.3-0.4kg of sludge, and most of the part of sludge needs to be discharged through the residual sludge. For example, the biochemical system removes COD2000kg every day, then excess sludge is produced by 600-800kg per day, and the amount of sludge with the water content of about 98 percent is about 30000kg-40000 kg.
Thirdly, ensuring the adding amount of the bacterial strain and pure oxygen;
according to the amount of the sludge, for example, 40000kg of sludge with 98% of water content per day, pure oxygen with the pure oxygen amount of 20kg is required to be introduced, the amount of the compound microbial inoculum is 60kg of the cultured bacterial liquid, and the proportion of each strain is as follows: listeria (Listeria): thermomomonas (Tthermomonospora): madura actinomycete (Actinomadura): pseudomonas fluorescens (p. fluorescences): neurospora crassa (n.crassa): white rot fungus (Phanerochaete): achromobacter (Achromobacter): alcaligenes (Alcaligenes): clostridium pasteurianum (cl. pasteurianum): bacillus megaterium (Bcillus megaterium): ammonia oxidizing archaea (nitrosorphaera viennensis) ═ 10%: (8%): (4%): (12%): (5%): (15%): (10%): (6%): (12%): (9%): (9%).
Fourthly, tracking the sludge reduction effect by engineering implementation;
according to the above embodiment of data analysis determination, the following process 2 needs to determine:
1. flow rate of surplus sludge per day system
2. Determining the amount of pure oxygen and the addition amount of bacterial liquid according to the flow;
3. according to domestication parameters of the strains;
4. and counting the change of the sludge yield every day and periodically summarizing.
Case analysis:
as shown in fig. 2-3, specifically, fig. 2 is a schematic view of an installation effect on a site where a certain engineering is implemented, fig. 3 is a schematic view of an effect of mixing high-purity pure oxygen with sludge and then entering a biochemical system, which is a practical case of the technology of the present invention, a wastewater treatment plant in Jiangsu chemical industry.
The project utilizes PRO2 to replace the original aeration and stirring system.
The supernatant ratio before and after use is shown in table 2:
TABLE 2
| Before decrement | After using the technology | Reduction of the ratio |
| The total solid value is 2.87% | The total solid value is 0.47% | -84％ |
| Total volatile solid 32.86% | Total volatile solid 77.53% | +136％ |
| 381 Total phosphorus (ppm) | Total phosphorus (ppm) ═ 0 | 100％ |
As can be seen from the table 2, the technical scheme of the invention saves the operation cost, reduces the sludge volume by 7 times on the basis of the original aerobic digestion, simultaneously eliminates the odor, improves the sludge dewatering performance, and shortens the sludge-making time by half.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (7)
1. A method for sludge reduction by combining high-purity pure oxygen with microbial treatment is characterized by comprising the following steps:
step one, pure oxygen with oxygen concentration of more than 99% is completely dissolved into the sludge wastewater mixed liquid in a molecular form by adopting a high-pressure capillary technology through pump conveying equipment, so that bubble-free conveying is realized, and large-flow super-dissolved oxygen (SSO) is generated2；
Degrading organic substances in the sludge wastewater mixed liquor by using aerobic microorganisms under the action of super dissolved oxygen, wherein the microorganism sources comprise self-generated microorganisms and increased microorganism strains in the sludge wastewater mixed liquor; the increased microbial strains include:
listeria (Listeria), Thermomonospora (thermoinospora), Actinomadura (Actinomadura), pseudomonas fluorescens (p. fluoscens), neurospora crassa (n. crassa), white rot fungus (Phanerochaete), Achromobacter (Achromobacter), Alcaligenes (Alcaligenes), clostridium pasteurianum (cl. pasteurianum), bacillus megaterium (Bcillus megaterium), and archaea ammoxidation bacteria (nitrosorosphaera venensis).
2. The method as claimed in claim 1, wherein in the first step, when the sludge-wastewater mixed liquor has a sludge concentration of 1.5-3%, the amount of pure oxygen is 600g for each 1.0 ton of sludge-wastewater mixed liquor.
3. The method according to claim 1 or 2, wherein in step one, the high pressure used in the high pressure capillary technique is 1-2 MPa.
4. The method of claim 1, wherein in step two, the mass ratio of the microbial strains increased is: listeria (Listeria): thermomomonas (Thermomonospora): madura actinomycete (Actinomadura): pseudomonas fluorescens (p. fluorescences): neurospora crassa (n.crassa): white rot fungus (Phanerochaete): achromobacter (Achromobacter): alcaligenes (Alcaligenes): clostridium pasteurianum (cl. pasteurianum): bacillus megaterium (Bcillus megaterium): ammonia oxidizing archaea (nitrosorphaera viennensis) ═ 5-12%: (7-10%): (1-5%): (10-15%): (3-8%): (10-15%): (6-12%): (1-6%): (6-12%): (9-12%): (5-10%).
5. The method according to claim 1 or 4, wherein in step two, the mass ratio of the microbial strains increased is preferably: listeria (Listeria): thermomomonas (Thermomonospora): madura actinomycete (Actinomadura): pseudomonas fluorescens (p. fluorescences): neurospora crassa (n.crassa): white rot fungus (Phanerochaete): achromobacter (Achromobacter): alcaligenes (Alcaligenes): clostridium pasteurianum (cl. pasteurianum): bacillus megaterium (Bcillus megaterium): ammonia oxidizing archaea (nitrosorphaera viennensis) 10%: 8%: 4%: 12%: 5%: 15%: 10%: 6%: 12%: 9%: 9 percent.
6. The method of claim 1, wherein the added microbial strains are activated and acclimated prior to addition using system feed water of a corresponding biochemical system, wherein the process conditions for activation are as follows: the proportion of the sludge wastewater mixed liquid to the microbial strains is 100: 1;
wherein the dissolved oxygen content DO is controlled to be 4-8mg/L, the temperature is 30-35 ℃, and the pH is 7-8.5, and the reaction is continuously carried out for 6-10 hours.
7. The method of claim 5, wherein the adding ratio of the activated and acclimatized microbial strain to the sludge-wastewater mixed liquor is 0.1-0.15%, wherein the water content in the sludge-wastewater mixed liquor is 97-98%.
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