CN114084965A - Oil refining wastewater biological treatment agent and use method thereof - Google Patents
Oil refining wastewater biological treatment agent and use method thereof Download PDFInfo
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- CN114084965A CN114084965A CN202010859549.1A CN202010859549A CN114084965A CN 114084965 A CN114084965 A CN 114084965A CN 202010859549 A CN202010859549 A CN 202010859549A CN 114084965 A CN114084965 A CN 114084965A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/342—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the enzymes used
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/347—Use of yeasts or fungi
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
- C02F2103/365—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds from petrochemical industry (e.g. refineries)
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention provides an oil refining wastewater biological treatment agent, which comprises a nutritional agent and a microbial inoculum, wherein the nutritional agent comprises: biological enzymes and humus.
Description
Technical Field
The invention relates to a biological wastewater treatment agent, a method and a device thereof, in particular to a method and a device for improving the biological wastewater treatment effect. Mainly used for treating refractory organics in oil refining wastewater, and belongs to the field of wastewater treatment.
Background
The biological wastewater treatment technology is widely applied to the treatment of various industrial wastewater due to the characteristics of high treatment efficiency, low operation cost, good stability, easy management and the like. The oil refining industry develops rapidly, so that the types and the production process of processed crude oil become increasingly complex, the types of organic pollutants in the generated wastewater are various and complicated, and the wastewater treatment difficulty is increased. With the rapid development of national economy, the nation puts higher demands on the environmental protection of enterprises, the emission standards of various pollutants are gradually improved, and the indexes of organic pollutants are particularly concerned. For most of the refining enterprises, the existing environmental protection treatment facilities are difficult to meet new treatment requirements, and in order to meet new discharge standards which are continuously issued by the state, many enterprises can only newly add and build various sewage advanced treatment facilities, such as fenton oxidation, catalytic ozone oxidation, filtration and other processes, which undoubtedly occupy the land for mass production of the enterprises, limit the future energy expansion and development of the enterprises, and even some enterprises face the problem of inexhaustible availability. In addition, as the scale of the enterprise device is enlarged, the load of the sewage treatment system is gradually increased; when the device is stopped and overhauled or the device is in failure, the sewage system is very easy to be impacted, the recovery time of the system after the impact is long, and the water outlet index during the recovery period can not meet the requirement; the quality of the effluent of the sewage plant is unstable, and the normal operation of a subsequent water treatment system is seriously influenced.
Based on the method, the research on the method for improving the biological treatment effect of the wastewater is developed, namely, the treatment efficiency of the existing device is improved on the premise of not newly building structures. Therefore, on one hand, the method can solve the contradiction between the unavailable condition and the continuous improvement of the treatment requirement of the enterprise, and simultaneously can improve the biological sewage treatment load of the enterprise and recover the sewage treatment system to normal as soon as possible when the sewage treatment system of the enterprise is impacted. At present, in the existing biological strengthening technology, various high-efficiency treatment strains are continuously added into a biological wastewater treatment system, so that the wastewater treatment cost is greatly increased. In order to solve the problems, specific strains which are separated from the wastewater and have high-efficiency decomposition capacity on specific pollutants in the wastewater are directly subjected to on-site propagation and domestication and are added into a sewage treatment system, the number of active microorganisms in a biological treatment device is increased, the wastewater treatment depth is further increased, and the stable standard discharge is realized at lower cost.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method and a device for improving the biological treatment effect of oil refining wastewater, which mainly aim at the treatment of organic pollutants difficult to degrade in the oil refining wastewater.
The technical scheme is as follows:
the invention provides an oil refining wastewater biological treatment agent in a first aspect, which comprises a nutritional agent and a specific microbial inoculum, wherein the nutritional agent comprises: biological enzymes and humus.
The specific microbial inoculum is at least one of stenotrophomonas, dietzia, candida lipolytica, mycobacterium phlei and nocardia melanocarpa. Preferably consists of any two of stenotrophomonas, Dietzia, Candida lipolytica, Mycobacterium phlei and Nocardia melanogaster in a ratio of 10: 1-1: 10, preferably 3: 1-1: 3.
The biological enzyme is prepared from protease, lipase, amylase and urease according to a reasonable proportion. Wherein the mixing ratio of the protease, the lipase and the amylase is 1:1:1, mixing the mixture of protease, lipase and amylase with urease in a ratio of 3: 1-10: 1.
the humic substance is at least one of humic acid and fulvic acid.
In a preferred embodiment of the present invention, the mixing ratio of the biological enzyme to the humic substance is 1: 5-1: 20.
A method for biologically treating oil refining wastewater comprises the following steps:
the wastewater is introduced into an aeration tank, the treatment agent is required to be added into the aeration tank, and the treatment speed and the treatment efficiency of the organic pollutants difficult to degrade in the wastewater are improved through the co-metabolism of the nutrient and the specific microbial inoculum in the treatment agent,
after the effluent from the aeration tank is precipitated by the precipitation tank, the indexes of the organic pollutants meet the treatment requirements.
Wherein the refractory organic contaminants include (but are not limited to): mixtures of n-alkanes, branched alkanes, cycloalkanes, aromatic hydrocarbons and small amounts of naphthenic acids.
In some preferred embodiments of the present invention, the aeration tank may be in the form of a contact oxidation tank, a biological aerated filter, and an activated sludge tank.
In a further preferred embodiment of the invention, the aeration tank is filled with filler and activated sludge as carriers of the special-effect microbial inoculum.
In other preferred embodiments of the present invention, the contact oxidation tank-type aeration tank is filled with soft packing, semi-soft packing, fiber bundle combined packing, elastic three-dimensional packing, or suspended packing.
In a further preferred embodiment of the present invention, the aeration tank in the form of a biological aerated filter is filled with granular fillers such as ceramsite, coke, quartz sand or activated carbon.
In some preferred embodiments of the invention, the activated sludge tank form aeration tank contains only activated sludge.
In a preferred embodiment of the invention, the sludge at the bottom of the sedimentation tank is returned to the aeration tank by a pump, so as to ensure the concentration and activity of the dominant microorganisms in the aeration tank.
Specifically, in the invention, the nutrient added into the aeration tank mainly comprises biological enzyme and humus, is a nutrient specially used for a biological system and customized for specific strains of special-effect bacteria screened in wastewater, and aims to prevent the aging of the specific strains inoculated at one time, ensure that microorganisms are always in the most active proliferation stage with less addition amount and ensure that a biochemical system stably runs up to the standard. The humic substance is at least one of humic acid and fulvic acid. The mixing ratio of the biological enzyme to the humus is 1: 5-1: 20. The nutrient is continuously added, and the adding amount is 0-1 mg/L.
The specific microbial inoculum consists of any two of stenotrophomonas, dietzia, candida lipolytica, mycobacterium phlei and nocardia melanocarpa. The composition ratio is 10: 1-1: 10, preferably 3: 1-1: 3.
Therefore, the use of the specific microbial inoculum is completed by one-time adding and repeated domestication and culture. According to the tank capacity and the wastewater quality condition of an aeration tank, a certain amount of special-effect microbial inoculum is added, the microbial inoculum is uniformly mixed with activated sludge and nutrients in the aeration tank, a certain amount of aeration liquid is pumped to a tank body of a biological strengthening device by a pump to carry out rapid proliferation and domestication of special-effect strains, after the bacteria liquid is cultured for 12-20 hours, the bacteria liquid is returned to the aeration tank by the pump, the steps are repeated until the effluent of a sedimentation tank meets the treatment requirement, a treatment system runs normally, and the change of the number of dominant microorganisms in the aeration tank and the change of COD index of the effluent of the sedimentation tank are continuously monitored in the process. The proliferation and domestication process of the specific strains needs to continuously add a special culture medium into the biological strengthening tank body. In the biological enhancement device, the temperature of the system is strictly controlled to be 25-35 ℃, the pH value is controlled to be 6.5-8 and the dissolved oxygen is controlled to be 2-5 mg/L.
The culture medium mainly comprises a carbon source and inorganic substances in the wastewater, and is a special biological system culture substrate for the specific microbial inoculum in the wastewater. The carbon source in the culture medium is mainly organic pollutants in wastewater, sodium acetate or methanol is supplemented properly, the COD of the wastewater in the control and enhancement device at the initial stage of culture is about 1000mg/L, and the COD: n: p is 100-200: 5-10: 1-10.
The biological enhancement device comprises a culture tank body, an operation control system, a heating medium circulating system, an aeration system and a cleaning and sterilizing system. The aeration mixed liquid is introduced into the culture tank body, and a culture medium is added to strengthen the special-effect strain culture place. The operation control system is a control panel and realizes full-automatic or manual operation. The heating medium circulating system provides heat for the whole culture and domestication process and ensures the optimum temperature when the culture tank body is used for intensive culture. The aeration system provides sufficient dissolved oxygen for the whole culture and domestication process. The cleaning and sterilizing system can clean and kill harmful bacteria inside the device, and creates a suitable environment for specific microorganism culture. The biological enhancement device utilizes the spiral nozzle to provide proper dissolved oxygen and fully stir, thereby improving the enhanced culture efficiency of microorganisms. The bioaugmentation device is also provided with a filtering system which can remove bacteria and dust in the air and provide clean air for bioaugmentation. The biological strengthening device has the functions of temperature control, aeration, stirring and the like.
The volume ratio of the aeration tank to the strengthening device is 5-10: 1.
The adding amount of the specific bacteria agent is 0.015-1% (volume ratio) of the tank volume of the aeration tank.
The invention has the beneficial effects that: the special-effect microbial inoculum is obtained by compounding organic pollutants in the oil refining wastewater, has stronger pertinence to the treatment of the specific pollutants in the wastewater, and has extremely high treatment efficiency. The special nutrient solution and culture medium are special reagents for biological system, which are customized for specific strains screened from waste water, and aims to prevent the aging of specific strains inoculated at one time, make the microorganism in the most active proliferation stage all the time with less dosage and ensure the stable standard operation of biochemical system. The field-used strengthening device only occupies one tenth to one fifth of the aeration tank, and cannot bring trouble of newly increasing the occupied area to enterprises. The special-effect microbial inoculum is added at one time, has low treatment cost and strong process applicability, improves the water outlet index of the system on the basis of not changing the original treatment facility of the enterprise wastewater treatment system, improves the shock resistance and shortens the recovery period after being impacted.
Drawings
FIG. 1 is a schematic diagram of the construction of a manual control embodiment of the present invention.
The scores in the figure indicate respectively: 1-a water inlet, 2-a wastewater lifting pump, 3-an aeration tank, 4-a sedimentation tank, 5-a sludge return pipeline, 6-a metering pump, 7-a nutrient feeding pipeline, 8-a biological strengthening device, 9-an aeration liquid and special-effect microbial inoculum conveying pipeline, 10-a water production conveying pipeline, 11-an aeration liquid (bacterial liquid) conveying pump, 12-a water outlet, 13-an intermediate connecting pipeline and 14-a sludge return pump.
Detailed Description
The present invention will be further described in detail with reference to the following examples for better understanding of the present invention, but the scope of the present invention as claimed is not limited to the scope shown in the examples.
Example 1
The device for improving the biological treatment effect of the wastewater comprises a biological treatment process and a proliferation and domestication device of a special-effect microbial inoculum, namely an aeration tank and a sedimentation tank and a biological enhancement device, wherein the biological reaction device is connected with the biological enhancement device through an aeration liquid and a bacterial liquid conveying pipeline.
The whole device is provided with a water inlet 1 and a water outlet 12, a wastewater lifting pump 2 is arranged behind the water inlet 1, and an aeration tank 3 is connected with a sedimentation tank 4 through an intermediate connecting pipeline 13. The effluent of the sedimentation tank 4 flows through a water production conveying pipeline 10 and a water outlet 12 and is directly discharged or is further treated for recycling. The front end of the water inlet 1 is provided with processes of oil separation and air flotation or oil separation and air flotation and oxygen deficiency, and the processes, the aeration tank and the sedimentation tank form a complete treatment system together.
In the running process of the aeration tank 3, a small amount of nutrient needs to be continuously added through a metering pump 6 and a nutrient adding pipeline 7.
A biological treatment agent is added into the aeration tank 3 at one time, the biological treatment agent consists of a nutrient and a special-effect microbial inoculum, the nutrient consists of biological enzyme and humus which are mixed in a ratio of 1:1, and the biological enzyme consists of the following components in percentage by weight: protease: lipase: amylase: urease is 1:1:1:1, and humus is humic acid. The specific microbial inoculum is formed by mixing stenotrophomonas and Dietzia 1: 1. An aeration liquid formed by mixing the biological treatment agent, the wastewater and the sludge flows through a pipeline 9 by an aeration liquid (bacterial liquid) delivery pump 11 to be connected with a biological strengthening device 8, so that the rapid proliferation and the domestication of the specific microbial inoculum are completed.
The sludge at the bottom of the sedimentation tank 4 is conveyed by a sludge return pump 14 to flow through a sludge return pipeline 5 and then is sent to the inlet of the aeration tank 3.
Example 2
Three types of refinery waste water were treated according to the procedure of example 1 to improve the biological treatment effect of the waste water, and the results are shown in Table 1.
TABLE 1 application results of the method for improving the biological treatment effect of wastewater
In the present invention, the pre-fortification means using a conventional biological treatment process. The reinforcement is realized by adopting the technical method of the invention, the original biological treatment process is not changed, different biological treatment agents are selected and used aiming at the composition of the organic matters which are difficult to degrade in the treated wastewater, the field special-effect strain is reinforced and added at one time, and the biological treatment effect of the wastewater is improved.
The data in Table 1 show that after the specific microbial inoculum is added into the biological wastewater treatment device for one time, the COD of the effluent after stable operation is reduced by continuous proliferation and domestication compared with that before the method is applied. Analysis data shows that the removal rate of COD in the biological treatment is more than 80 percent and even more than 90 percent before the strengthening, which indicates that the biochemical treatment reaches a certain depth, the rest COD is basically difficult to degrade, but the COD is still reduced after the special-effect microbial inoculum is added, and indicates that the method can actually improve the biological treatment effect of the wastewater. Meanwhile, the method can be seen that the number of microorganisms in the biochemical aeration tank is obviously increased before and after the method is used.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. An oil refining wastewater biological treatment agent comprises a nutritional agent and a specific microbial inoculum, wherein the nutritional agent comprises: biological enzymes and humus.
2. The agent according to claim 1, wherein the specific microbial agent is at least one selected from the group consisting of stenotrophomonas, dietzia, candida lipolytica, mycobacterium phlei and nocardia melanocarpa.
3. The treating agent according to claim 2, wherein the microbial inoculum is selected from any two of stenotrophomonas, dietzia, candida lipolytica, mycobacterium phlei and nocardia melanocarpa, and the ratio of the compositions is 10: 1-1: 10.
4. The treating agent according to any one of claims 1 to 3, wherein the biological enzyme is composed of protease, lipase, amylase and urease, and the mixing ratio of protease, lipase and amylase is 1:1:1, mixing the mixture of protease, lipase and amylase with urease in a ratio of 3: 1-10: 1.
5. the treating agent according to any one of claims 1 to 4, wherein the humic substance is at least one of humic acid and fulvic acid.
6. The treating agent according to any one of claims 1 to 5, wherein the mixing ratio of the biological enzyme to the humic substance is 1: 5-1: 20.
7. A process for treating refinery waste water using the treating agent according to any one of claims 1 to 6, comprising:
the wastewater is introduced into an aeration tank, the treatment agent is required to be added into the aeration tank, and the treatment speed and the treatment efficiency of the organic pollutants difficult to degrade in the wastewater are improved through the co-metabolism of the nutrient and the specific microbial inoculum in the treatment agent,
after the effluent from the aeration tank is precipitated by the precipitation tank, the indexes of the organic pollutants meet the treatment requirements.
8. The method according to claim 7, wherein the aeration tank may be in the form of a contact oxidation tank, a biological aerated filter and an activated sludge tank.
9. The method according to claim 7 or 8, wherein the aeration tank is filled with filler and/or activated sludge as a carrier of the specific microbial inoculum.
10. The method of claim 9, wherein the contact oxidation pond-form aeration tank is filled with soft packing, semi-soft packing, fiber bundle combined packing, elastic three-dimensional packing, and suspended packing.
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| CN115385456A (en) * | 2022-08-12 | 2022-11-25 | 江苏斯盖环保科技有限公司 | Efficient denitrification sewage treatment agent and preparation method thereof |
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