CN114426383B - Biological harmless treatment method for high-oil-content sludge - Google Patents
Biological harmless treatment method for high-oil-content sludge Download PDFInfo
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- CN114426383B CN114426383B CN202011001995.5A CN202011001995A CN114426383B CN 114426383 B CN114426383 B CN 114426383B CN 202011001995 A CN202011001995 A CN 202011001995A CN 114426383 B CN114426383 B CN 114426383B
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F11/00—Treatment of sludge; Devices therefor
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention belongs to the technical field of oily sludge treatment, and particularly relates to a biological harmless treatment method for high-oily sludge. The method specifically comprises the following steps: screening high-oil-content sludge; preparing sludge; adding a hydrocarbon-philic microorganism activator; aeration and recovery of floating oil; and (3) adding biological enzyme. The invention has simple construction process and convenient operation, and can reduce the treatment time of the oily sludge from more than three months of conventional treatment to less than one month, and shorten the treatment time by more than 3 times; compared with the conventional oily sludge treatment, the method has no requirement on the environmental temperature of the oily sludge treatment, does not need heating equipment to supply heat to the reaction tank, and can save more than 20% of treatment cost per ton of oily sludge compared with the conventional process; after the biological harmless treatment, the petroleum hydrocarbon content of the oily sludge can be reduced from more than 10% to less than 0.045%o, and the on-site experiment effect is good. Therefore, the invention has wide popularization and application prospect.
Description
Technical Field
The invention belongs to the technical field of oily sludge treatment, in particular to an environment-friendly and efficient biological treatment method, and particularly relates to a biological harmless treatment method for high-oily sludge.
Background
The oily sludge is oily solid waste generated in the exploration, development, operation and gathering processes of oil fields, and the main components of the oily sludge are crude oil and silt. Because of their complex composition, difficult disposal and environmental risks, they have been classified into hazardous waste lines. The high-oil-content sludge is one of oily sediments in oil fields, the oil content of the high-oil-content sludge is generally more than 10 percent, the water content of the high-oil-content sludge is more than 80 percent, and the high-oil-content sludge mainly originates from sediments at the bottom of a collection and transportation tank of a combined station. High oil content, large stock and difficult disposal are common problems faced by large oil fields.
At present, the treatment process of the oily sludge mainly comprises an incineration method, a hot water washing method, a thermal analysis method, a profile control method, a biological repair method and the like. The incineration method has higher treatment cost and environmental pollution risk, and does not meet the current treatment requirements of the oily sludge; the hot water washing and thermal desorption method has high equipment investment, high heating treatment cost and high large-scale treatment difficulty for the oilfield site; the profile control reinjection method is easy to block underground reservoir pore throats to reduce the block permeability, and meanwhile, the risk of pollution to underground water due to the influence of channeling does not advocate application. The bioremediation method of the oily sludge is a mainstream treatment process at present, and harmless treatment can be realized by utilizing hydrocarbon-philic microorganisms to degrade petroleum hydrocarbon, but the treatment period of the current process is more than two years, and the bioremediation method is only suitable for the oily sludge with the oil content of less than 5 percent. Therefore, there is an urgent need to develop an economical and harmless method for efficiently disposing of high-oil-content sludge with a large stock.
CN111153573a discloses a comprehensive treatment system and method for oily sludge, the system is composed of a pretreatment device and a pyrolysis incineration combined device, the oily sludge is firstly modified and dehydrated by the pretreatment system, and then enters the pyrolysis incineration combined device to carry out pyrolysis incineration on the pretreated oily sludge. The method can be used for harmless treatment of the oily sludge, but the prior equipment investment is larger, the treatment cost of the pretreatment and pyrolysis process is higher, and the large-scale treatment difficulty of the oilfield on site is larger.
CN109020126a discloses a construction process for bioremediation of oily sludge, which comprises the steps of sampling and analyzing the oily sludge, selecting engineering bacteria, culturing the engineering bacteria into dominant bacterial groups, adding the dominant bacterial groups and nutritional agents into the oily sludge according to a proportion, mixing and maintaining the oily sludge sand added with the nutritional agents and the dominant bacterial agents by using a rotary cultivator, and detecting periodically. The soil temperature is required to be 15-45 ℃, and when the large-scale oily sludge is repaired, the temperature is required to be heated to 45 ℃ at the highest, the energy consumption is high, the on-site implementation difficulty is high, and the method is not suitable for the sludge with high oil content.
Disclosure of Invention
The invention provides a biological harmless treatment method for high-oil-content sludge, which aims at the defects of the prior art. The invention performs aeration in the microbial treatment process of the high-oil-content sludge, on one hand, the crude oil in the oil-content sludge is carried out by pretreatment, and on the other hand, oxygen is supplied to the microorganisms. And then adding a biological enzyme system, so that harmless degradation of the high-oil-content sludge can be realized at normal temperature, and meanwhile, the treatment time is shortened, the cost is reduced, and the efficiency is improved.
In order to achieve the aim, the invention discloses a biological innocent treatment method for high-oil-content sludge, which comprises the following steps:
(1) Screening high-oil-content sludge;
(2) Preparing sludge;
(3) Adding a hydrocarbon-philic microorganism activator;
(4) Aeration and recovery of floating oil;
(5) And (3) adding biological enzyme.
The conventional oil-containing sludge microorganism treatment process has high temperature requirement, and can be performed only after 5-9 months of high temperature or after the heating device is required to continuously supply heat. The invention provides a method for disposing oily sludge microorganisms at normal temperature, which adopts a physical method to destroy the cell walls of high-efficiency hydrocarbon-philic bacteria and release biological enzymes in the body of the bacteria, so as to accelerate the degradation of petroleum hydrocarbon in the oily sludge and adjust the concentration of the biological enzymes according to the environmental temperature. The invention can effectively improve the disposal speed of the oily sludge and reduce the disposal cost of the oily sludge.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) The construction process is simple, the operation is convenient, the treatment time of the oily sludge can be reduced from more than 3 months of conventional treatment to less than one month, and the treatment time is shortened by more than 3 times;
(2) Compared with the conventional oily sludge treatment, the method has no requirement on the environmental temperature of the oily sludge treatment, does not need heating equipment to supply heat to the reaction tank, and can save more than 20 percent of treatment cost (energy and site cost are saved) per ton of oily sludge compared with the conventional process;
(3) On the one hand, the aeration treatment process can bring out part of crude oil in the high-oil-content sludge, and can provide dissolved oxygen for hydrocarbon-philic microorganisms;
(4) After the biological harmless treatment is carried out, the petroleum hydrocarbon content of the oily sludge can be reduced from more than 10% to less than 0.045 mill, which accords with the soil pollution risk management and control standard (trial) of soil environmental quality construction land for soil environment quality construction of the national trial in 2008.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
The invention discloses a biological harmless treatment method for high-oil-content sludge, which comprises the following steps:
(1) Screening high-oil-content sludge;
(2) Preparing sludge;
(3) Adding a hydrocarbon-philic microorganism activator;
(4) Aeration and recovery of floating oil;
(5) And (3) adding biological enzyme.
In the present invention, it is preferable that the screening of the high oil sludge should satisfy the following conditions: (1) combined station tank bottom sludge; (2) oil content > 10%, water content > 80%; (3) Hydrocarbon-philic microbe is present and the concentration of bacteria is >1.0×10 2 And each ml.
Preferably, the hydrocarbon-philic microorganism is one of Serratia, sphingomonas and Arthrobacter, and more preferably Arthrobacter.
Preferably, in the step (2), the disposing of the sludge is performed as follows: the high-oil-content sludge is mixed with water in a reaction tank according to the proportion of 1:1-5, the water temperature is not required, and the mixture is uniformly stirred after being mixed, so that heat preservation measures are not required.
Preferably, in step (3), the hydrocarbon-philic microbial activator formulation includes a carbon source, a nitrogen source, and a phosphorus source. The carbon source is sucrose or glucose, and the mass concentration is 1.0-3.0%; the nitrogen source is corn steep liquor dry powder or peptone, and the mass concentration is 0.2-0.5%; the phosphorus source is diammonium hydrogen phosphate or sodium phosphate, and the mass concentration is 0.02-0.05%.
Preferably, the addition amount of the hydrocarbon-philic microbial activator is 1-5% of the total mass of the sludge.
Furthermore, the formula of the hydrocarbon-philic microorganism activator also comprises an accelerator, wherein the accelerator is preferably a trace element, and the adding amount of the accelerator is 0.05-0.1% of the total mass of the sludge.
Preferably, in the step (4), the aeration is performed as follows: introducing air into the reaction tank through a pipeline, keeping the dissolved oxygen above 2mg/L, on one hand, pretreating crude oil in the oil-containing sludge, and on the other hand, providing the growth dissolved oxygen for hydrocarbon-philic microorganisms.
Preferably, in the step (4), the recovery of the floating oil refers to recovery and reuse of the floating oil at the upper part of the reaction tank after aeration by a recovery device such as an oil scraping plate.
In the present invention, preferably, in the step (5), the amount of the bio-enzyme added is 0.01 to 0.05% of the total mass of the sludge.
Preferably, in the step (5), the biological enzyme is one or more of gelatinase, casein enzyme, keratinase and polygalacturonase, preferably casein enzyme or keratinase.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
The invention will be further illustrated with reference to specific examples.
Example 1:
combined station K of victory oil field 3 The properties of the oily sludge are as follows: 12.8% of oil, 81% of water and 2.0X10% of Serratia in the oily sludge 2 The bacterial concentration of the methane coccus per ml is 1.0X10 2 And each ml.
The method of the invention is utilized for the joint station K 3 The oily sludge is subjected to innocent treatment, and the specific steps are as follows:
(1) Screening of high oil sludge
Combined station K 3 The properties of the oily sludge are as follows: 12.8% of oil, 81% of water and 2.0X10% of Serratia in the oily sludge 2 The bacterial concentration of the methane coccus per ml is 1.0X10 3 And each ml. Meets the screening requirements of the invention.
(2) Arrangement of sludge
K 3 The combined station contains about 300 parts of oily sludge, and K is added in a reaction tank 3 The oil-containing sludge and water of the combination station are mixed according to any one of the proportion of 1:1-5, and are uniformly stirred after being mixed.
(3) Addition of a hydrocarbon-philic microbial activator
100g of uniformly mixed oily sludge is taken, 5ml of activator is added, the formula of the activator is shown in table 1, the concentration of bacteria in the oily sludge after different activators are added is examined, and the detection result is shown in table 1.
TABLE 1 different activator treatments K 3 Detection result of concentration of oil sludge sand bacteria of combined station
As can be seen from table 1: the group 3 experiments show that the concentration of the inner bacteria of the oil-containing sludge is highest after five days and ten days, so that the screened activator comprises 2.0wt% of sucrose, 0.4wt% of corn steep liquor dry powder, 0.03wt% of diammonium hydrogen phosphate and 0.06wt% of trace elements.
(4) Aeration and recovery of oil slick
Air is introduced into the reaction tank through a pipeline, and the dissolved oxygen is kept above 2 mg/L. And recycling the floating oil at the upper part of the reaction tank after aeration through recycling devices such as an oil scraping plate.
(5) Biological enzyme adding
0.04% of biological enzyme is added into the reaction tank because the external temperature is 25 ℃.
And continuously stirring the reaction tank by using a stirrer, randomly selecting five points in the reaction tank after 1 month for petroleum hydrocarbon content detection, and the detection results are shown in the following table.
Table 2K 3 Detection condition after treatment of oily sludge of combined station
| Sampling point | 1 | 2 | 3 | 4 | 5 |
| Petroleum hydrocarbon content | 0.036‰ | 0.041‰ | 0.028‰ | 0.033‰ | 0.035‰ |
And (3) field effect evaluation: after implementation, five points selected randomly in the reaction tank are used for detecting the oil-contaminated petroleum hydrocarbon content in the tank, and the result is as follows: sampling point 1 petroleum hydrocarbon content 0.036%o, sampling point 2 petroleum hydrocarbon content 0.041%; sampling point 3 petroleum hydrocarbon content 0.028%; sampling point 4 petroleum hydrocarbon content 0.033%; the petroleum hydrocarbon content of the sampling point 5 is 0.035 per mill, which is lower than the petroleum hydrocarbon upper limit value of 0.045 per mill required by the soil pollution risk management and control Standard (trial) of the soil environmental quality construction land of GB36600-2018 which is tried in the state of 2018. Compared with the conventional disposal process, the present invention has the advantages of shortened disposal time of about 3.2 times, reduced disposal cost by about 25%, and good field implementation effect.
Example 2:
victory oil field certain joint station B 1 The properties of the oily sludge are as follows: 15% of oil, 80% of water and 4.0X10% of Serratia in the oily sludge 2 And each ml.
Pair B by the method of the invention 1 The combined station oily sludge is subjected to innocent treatment, and the specific steps are as follows:
(1) Screening of high oil sludge
B1 combination station oily sludge has the following properties: 15% of oil, 80% of water and 4.0X10% of Serratia in the oily sludge 2 And each ml. Meets the screening requirements of the invention.
(2) Arrangement of sludge
B 1 About 420 parts of oil-containing sludge of the combined station is treated by the method of B in a reaction tank 1 The oil-containing sludge and water of the combination station are mixed according to any one of the proportion of 1:1-5, and are uniformly stirred after being mixed.
(3) Addition of a hydrocarbon-philic microbial activator
100g of uniformly mixed oily sludge is taken, 5ml of activator is added, the formula of the activator is shown in table 3, the concentration of bacteria in the oily sludge after different activators are added is examined, and the detection result is shown in table 3.
TABLE 3 different activator treatments B 1 Detection result of concentration of oil sludge sand bacteria of combined station
As can be seen from table 3: the concentration of the inner bacteria of the oil-containing sludge is the highest after five days and ten days of the experiment of the group 2, so that the screened activator is 1.0wt% of glucose, 0.2wt% of peptone, 0.02wt% of sodium phosphate and 0.05wt% of trace elements.
(4) Aeration and recovery of oil slick
Air is introduced into the reaction tank through a pipeline, and the dissolved oxygen is kept above 2 mg/L. And recycling the floating oil at the upper part of the reaction tank after aeration through recycling devices such as an oil scraping plate.
(5) Biological enzyme adding
And adding 0.05% of biological enzyme into the reaction tank because the external temperature is 18 ℃.
And continuously stirring the reaction tank by using a stirrer, randomly selecting five points in the reaction tank after 1 month for petroleum hydrocarbon content detection, and the detection results are shown in the following table.
Table 4B 1 Detection condition after treatment of oily sludge of combined station
| Sampling point | 1 | 2 | 3 | 4 | 5 |
| Petroleum hydrocarbon content | 0.027‰ | 0.021‰ | 0.038‰ | 0.037‰ | 0.031‰ |
And (3) field effect evaluation: after implementation, five points selected randomly in the reaction tank are used for detecting the oil-contaminated petroleum hydrocarbon content in the tank, and the result is as follows: sampling point 1 petroleum hydrocarbon content 0.027%o, sampling point 2 petroleum hydrocarbon content 0.021%o; sampling point 3 petroleum hydrocarbon content 0.038%; sampling point 4 petroleum hydrocarbon content 0.037%; the petroleum hydrocarbon content of the sampling point 5 is 0.031 per mill, which is lower than the petroleum hydrocarbon upper limit value of 0.045 per mill required by the soil pollution risk management and control Standard (trial) of the soil environmental quality construction land of GB36600-2018, which is tried in the China in 2018. Compared with the conventional treatment process, the treatment time of the application is shortened by about 3.5 times, and meanwhile, the treatment cost is reduced by about 20 percent, so that the field implementation effect is good.
Example 3:
victory oilfield coupletStation G 1 The properties of the oily sludge are as follows: 13.5% of oil, 82% of water and 5.0X10% of methane coccus in the oil-containing sludge 2 And each ml. .
The method of the invention is used for G 1 The combined station oily sludge is subjected to innocent treatment, and the specific steps are as follows:
(1) Screening of high oil sludge
The properties of the G1 complex station oily sludge are as follows: 13.5% of oil, 82% of water and 5.0X10% of Serratia bacteria in the oily sludge 2 And each ml. Meets the screening requirements of the invention.
(2) Arrangement of sludge
G 1 The oil-containing sludge of the combined station is about 360 parts, G is added in the reaction tank 1 The oil-containing sludge and water of the combination station are mixed according to any one of the proportion of 1:1-5, and are uniformly stirred after being mixed.
(3) Addition of a hydrocarbon-philic microbial activator
100g of uniformly mixed oily sludge is taken, 5ml of activator is added, the formula of the activator is shown in table 5, the concentration of bacteria in the oily sludge after different activators are added is examined, and the detection result is shown in table 3.
TABLE 5 different activator treatments G 1 Detection result of concentration of oil sludge sand bacteria of combined station
As can be seen from table 5: the group 5 experiment has the highest concentration of the inner bacteria of the oil-containing sludge after five days and ten days, so that the screened activator comprises 3.0wt% of sucrose, 0.5wt% of corn steep liquor dry powder, 0.04wt% of diammonium hydrogen phosphate and 0.08wt% of trace elements.
(4) Aeration and recovery of oil slick
Air is introduced into the reaction tank through a pipeline, and the dissolved oxygen is kept above 2 mg/L. And recycling the floating oil at the upper part of the reaction tank after aeration through recycling devices such as an oil scraping plate.
(5) Biological enzyme adding
And adding 0.01% of biological enzyme into the reaction tank because the external temperature is 30 ℃.
And continuously stirring the reaction tank by using a stirrer, randomly selecting five points in the reaction tank after 1 month for petroleum hydrocarbon content detection, and the detection results are shown in the following table.
TABLE 6 post-treatment detection of oily sludge at G1 complex
| Sampling point | 1 | 2 | 3 | 4 | 5 |
| Petroleum hydrocarbon content | 0.022‰ | 0.019‰ | 0.008‰ | 0.025‰ | 0.014‰ |
And (3) field effect evaluation: after implementation, five points selected randomly in the reaction tank are used for detecting the oil-contaminated petroleum hydrocarbon content in the tank, and the result is as follows: sampling point 1 petroleum hydrocarbon content 0.022%o, sampling point 2 petroleum hydrocarbon content 0.019%o; sampling point 3 petroleum hydrocarbon content 0.008 per mill; sampling point 4 petroleum hydrocarbon content 0.025%; the petroleum hydrocarbon content of the sampling point 5 is 0.014%o, which is lower than the petroleum hydrocarbon upper limit value of 0.045%o required by the soil pollution risk management and control Standard (trial) of the soil environmental quality construction land of the soil environment of GB36600-2018 tried in the 2018 country. Compared with the conventional disposal process, the present invention has the advantages of shortened disposal time by about 3 times, reduced disposal cost by more than 25%, and good field implementation effect.
Example 4:
combined station C of victory oil field 2 The properties of the oily sludge are as follows: 14.6% of oil, 83.3% of water, and 1.0X10% of Serratia bacteria in the oily sludge 2 The bacterial concentration of the methane coccus per ml is 3.0X10 2 And each ml.
Using the method of the invention for the combined station C 2 The oily sludge is subjected to innocent treatment, and the specific steps are as follows:
(1) Screening of high oil sludge
Combined station C 2 The properties of the oily sludge are as follows: 14.6% of oil, 83.3% of water, and 1.0X10% of Serratia bacteria in the oily sludge 2 The bacterial concentration of the methane coccus per ml is 3.0X10 2 And each ml. Meets the screening requirements of the invention.
(2) Arrangement of sludge
C 2 About 300 parts of oily sludge of the combined station is treated by C in a reaction tank 2 The oil-containing sludge and water of the combination station are mixed according to any one of the proportion of 1:1-5, and are uniformly stirred after being mixed.
(3) Addition of a hydrocarbon-philic microbial activator
100g of uniformly mixed oily sludge is taken, 5ml of activator is added, the formula of the activator is shown in table 1, the concentration of bacteria in the oily sludge after different activators are added is examined, and the detection result is shown in table 1.
TABLE 1 different activator treatments C 2 Detection result of concentration of oil sludge sand bacteria of combined station
As can be seen from table 1: the concentration of the inner bacteria of the oil-containing sludge is the highest after five days and ten days of the experiment of the 1 st group, so that the screened activator is 1.0wt% of sucrose, 0.2wt% of corn steep liquor dry powder and 0.02wt% of diammonium hydrogen phosphate.
(4) Aeration and recovery of oil slick
Air is introduced into the reaction tank through a pipeline, and the dissolved oxygen is kept above 2 mg/L. And recycling the floating oil at the upper part of the reaction tank after aeration through recycling devices such as an oil scraping plate.
(5) Biological enzyme adding
And adding 0.04% of biological enzyme into the reaction tank because the external temperature is 22 ℃.
And continuously stirring the reaction tank by using a stirrer, randomly selecting five points in the reaction tank after 1 month for petroleum hydrocarbon content detection, and the detection results are shown in the following table.
Table 2C 2 Detection condition after treatment of oily sludge of combined station
| Sampling point | 1 | 2 | 3 | 4 | 5 |
| Petroleum hydrocarbon content | 0.018‰ | 0.026‰ | 0.014‰ | 0.029‰ | 0.033‰ |
And (3) field effect evaluation: after implementation, five points selected randomly in the reaction tank are used for detecting the oil-contaminated petroleum hydrocarbon content in the tank, and the result is as follows: sampling point 1 petroleum hydrocarbon content 0.018%o, sampling point 2 petroleum hydrocarbon content 0.026%o; sampling point 3 petroleum hydrocarbon content 0.014%o; sampling point 4 petroleum hydrocarbon content 0.029%; the petroleum hydrocarbon content of the sampling point 5 is 0.033 per mill, which is lower than the petroleum hydrocarbon upper limit value of 0.045 per mill required by the soil pollution risk management and control Standard (trial) of the soil environmental quality construction land of the soil for the national trial in 2018. Compared with the conventional disposal process, the present invention has the advantages of shortened disposal time by about 3.2 times, reduced disposal cost by about 22%, and good field implementation effect.
Example 5:
victory oilfield certain combination station D 4 The properties of the oily sludge are as follows: 11.2% of oil, 85.2% of water and 3.0X10% of methane coccus in the oil-containing sludge 2 And each ml.
Using the method of the invention for the combined station D 4 The oily sludge is subjected to innocent treatment, and the specific steps are as follows:
(1) Screening of high oil sludge
Combined station D 4 The properties of the oily sludge are as follows: 11.2% of oil, 85.2% of water and 3.0X10% of methane coccus in the oil-containing sludge 2 And each ml. Meets the screening requirements of the invention.
(2) Arrangement of sludge
D 4 About 400 parts of oily sludge of the combined station is treated by D in a reaction tank 4 The oil-containing sludge and water of the combination station are mixed according to any one of the proportion of 1:1-5, and are uniformly stirred after being mixed.
(3) Addition of a hydrocarbon-philic microbial activator
100g of uniformly mixed oily sludge is taken, 5ml of activator is added, the formula of the activator is shown in table 1, the concentration of bacteria in the oily sludge after different activators are added is examined, and the detection result is shown in table 1.
TABLE 1 different activator treatments D 4 Detection result of concentration of oil sludge sand bacteria of combined station
As can be seen from table 1: the concentration of the inner bacteria of the oil-containing sludge is the highest after five days and ten days of the experiment of the 6 th group, so that the screened activator is 3.0wt% of glucose, 0.5wt% of peptone, 0.04wt% of sodium phosphate and 0.08wt% of trace elements.
(4) Aeration and recovery of oil slick
Air is introduced into the reaction tank through a pipeline, and the dissolved oxygen is kept above 2 mg/L. And recycling the floating oil at the upper part of the reaction tank after aeration through recycling devices such as an oil scraping plate.
(5) Biological enzyme adding
And adding 0.02% of biological enzyme into the reaction tank because the external temperature is 28 ℃.
And continuously stirring the reaction tank by using a stirrer, randomly selecting five points in the reaction tank after 1 month for petroleum hydrocarbon content detection, and the detection results are shown in the following table.
Table 2D 4 Detection condition after treatment of oily sludge of combined station
| Sampling point | 1 | 2 | 3 | 4 | 5 |
| Petroleum hydrocarbon content | 0.008‰ | 0.011‰ | 0.019‰ | 0.014‰ | 0.027‰ |
And (3) field effect evaluation: after implementation, five points selected randomly in the reaction tank are used for detecting the oil-contaminated petroleum hydrocarbon content in the tank, and the result is as follows: sampling point 1 petroleum hydrocarbon content 0.008%o, sampling point 2 petroleum hydrocarbon content 0.011%o; the petroleum hydrocarbon content of the sampling point 3 is 0.019 per mill; sampling point 4 petroleum hydrocarbon content 0.014%; the petroleum hydrocarbon content of the sampling point 5 is 0.027 per mill, which is lower than the petroleum hydrocarbon upper limit value of 0.045 per mill required by the soil pollution risk management and control Standard (trial) of the soil environmental quality construction land of the soil for the national trial in 2018. Compared with the conventional disposal process, the present invention has the advantages of shortened disposal time by about 3 times, reduced disposal cost by about 24%, and good field implementation effect.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (9)
1. The biological harmless treatment method for the high-oil-content sludge is characterized by comprising the following steps of:
(1) The following conditions are required for screening the high-oil sludge: (1) sludge at the bottom of the combined station tank; (2) containing oilThe amount is more than 10 percent, and the water content is more than 80 percent; (3) hydrocarbon-philic microbe exists and the concentration of bacteria is more than 1.0X10 2 The hydrocarbon-philic microorganism is one of Serratia, sphingomonas and Arthrobacter;
(2) The preparation of the sludge, namely mixing the sludge with high oil content with water in a reaction tank according to any one of the proportion of 1:1-5, wherein the water temperature is not required, and the sludge is uniformly stirred after being mixed, so that heat preservation measures are not required;
(3) The method comprises the steps of adding a hydrocarbon-philic microbial activator, wherein the formula of the hydrocarbon-philic microbial activator comprises a carbon source, a nitrogen source, a phosphorus source and an accelerator, and the accelerator is a trace element;
(4) Aeration and recovery of floating oil, and introducing air into the reaction tank through a pipeline to keep dissolved oxygen above 2mg/L, so that crude oil in the oil-containing sludge is pretreated and carried out on the one hand, and growing dissolved oxygen is provided for hydrocarbon-philic microorganisms on the other hand;
(5) The biological enzyme is one or more of gelatinase, casein enzyme, keratinase and polygalacturonase.
2. The method according to claim 1, wherein the carbon source is sucrose or glucose, and the mass concentration is 1.0 to 3.0%.
3. The method according to claim 1, wherein the nitrogen source is corn steep liquor dry powder or peptone, and the mass concentration is 0.2-0.5%.
4. The method according to claim 1, wherein the phosphorus source is diammonium phosphate or sodium phosphate, and the mass concentration is 0.02-0.05%.
5. The method according to claim 1, wherein the hydrocarbon-philic microbial activator is added in an amount of 1-5% of the total mass of the sludge.
6. The method according to claim 1, wherein the accelerator is added in an amount of 0.05 to 0.1% by mass of the total mass of the sludge.
7. The treatment method according to claim 1, wherein in the step (4), the recovery of the floating oil means that the floating oil at the upper part of the reaction tank after aeration is recovered and reused by a recovery device such as a scraper.
8. The method of claim 1, wherein the biological enzyme is a caseinase or a keratinase.
9. The treatment method according to claim 1 or 8, wherein in the step (5), the amount of the biological enzyme added is 0.01-0.05% of the total mass of the sludge.
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| CN202011001995.5A CN114426383B (en) | 2020-09-22 | 2020-09-22 | Biological harmless treatment method for high-oil-content sludge |
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| CN101172738A (en) * | 2007-11-13 | 2008-05-07 | 天津莱特化工有限公司 | Innocent treatment method for oil-containing sewage sludge |
| JP2011182782A (en) * | 2010-02-09 | 2011-09-22 | Sekisui Aqua System Kk | Oil-and-fat splitting microorganism, microorganism-immobilization carrier, method for treating waste water and system for treating waste water |
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| CN110746063A (en) * | 2019-10-28 | 2020-02-04 | 中国石油化工股份有限公司 | Method for harmless treatment of oil sludge sand |
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| CN101172738A (en) * | 2007-11-13 | 2008-05-07 | 天津莱特化工有限公司 | Innocent treatment method for oil-containing sewage sludge |
| JP2011182782A (en) * | 2010-02-09 | 2011-09-22 | Sekisui Aqua System Kk | Oil-and-fat splitting microorganism, microorganism-immobilization carrier, method for treating waste water and system for treating waste water |
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