CN114249503A - Petroleum wastewater treatment method - Google Patents

Petroleum wastewater treatment method Download PDF

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CN114249503A
CN114249503A CN202111656680.9A CN202111656680A CN114249503A CN 114249503 A CN114249503 A CN 114249503A CN 202111656680 A CN202111656680 A CN 202111656680A CN 114249503 A CN114249503 A CN 114249503A
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treatment
wastewater
petroleum
petroleum wastewater
fenton oxidation
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温尚龙
陈欣义
林盛华
韦秀杰
林秀华
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Guangxi Guangshen Environmental Protection Engineering Co ltd
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Guangxi Guangshen Environmental Protection Engineering Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C—CHEMISTRY; METALLURGY
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    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/722—Oxidation by peroxides
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/12—Halogens or halogen-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C02F2101/22—Chromium or chromium compounds, e.g. chromates
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/32—Hydrocarbons, e.g. oil
    • 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
    • C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2209/44—Time
    • 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
    • C02F3/005—Combined electrochemical biological processes
    • 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
    • C02F3/12—Activated sludge processes
    • C02F3/1205—Particular type of activated sludge processes
    • C02F3/1215—Combinations of activated sludge treatment with precipitation, flocculation, coagulation and separation of phosphates
    • 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
    • C02F3/30—Aerobic and anaerobic processes

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Abstract

The invention discloses a petroleum wastewater treatment method, wherein petroleum wastewater enters a Fenton oxidation treatment process and an advanced treatment process after being subjected to a pretreatment process and is discharged; the Fenton oxidation treatment process comprises the steps that the petroleum wastewater after pretreatment is sequentially subjected to Fenton oxidation treatment and coagulating sedimentation treatment; the advanced treatment process comprises the steps of sequentially carrying out USAB anaerobic treatment and activated sludge treatment on the petroleum wastewater subjected to Fenton oxidation treatment. The invention carries out separate treatment according to the water quality characteristics of different procedures of the petroleum wastewater, and compared with mixed treatment, the treatment effect of the petroleum wastewater treatment method is better, the treated wastewater can meet the requirements that the petroleum is less than or equal to 4mg/L, the COD is less than or equal to 100mg/L, the wastewater treatment cost is lower, and the operation is more stable.

Description

Petroleum wastewater treatment method
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a petroleum wastewater treatment method.
Background
Petroleum wastewater is classified according to different procedures and is roughly divided into drilling wastewater, acid fracturing operation wastewater and the like. Drilling wastewater and acid fracturing operation wastewater are main pollution sources in the production process of petroleum and natural gas enterprises. According to statistics, each drilling team discharges about 30m of wastewater per day3100-200m of wastewater generated by each fracturing well3100-200m of wastewater discharged from each acidification well3. The drilling wastewater has the characteristics of a plurality of points, wide range, complex pollutant types, intermittent discharge, uncontrollable discharge and the like, and becomes one of the wastewater pollution sources which are difficult to manage and treat in the petroleum industry. The drilling wastewater contains various components in the slurry, the composition is complex, and main pollutants comprise suspended matters, heavy metals, oil, phenol, sulfides and the like. The composition and concentration of the slurry change with the change of slurry systems (calcium treatment slurry, polymer slurry, sulfonated slurry and the like). The drilling wastewater has the characteristics of high chromaticity, high content of suspended matters, high CODcr value and poor biodegradability of organic matters.
Disclosure of Invention
In order to overcome the problem that the petroleum wastewater can not be effectively treated in the prior art, the invention aims to provide a petroleum wastewater treatment method.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a petroleum wastewater treatment method, petroleum wastewater enters Fenton oxidation treatment process and advanced treatment process after pretreatment process, and is discharged;
the Fenton oxidation treatment process comprises the steps that the petroleum wastewater after pretreatment is sequentially subjected to Fenton oxidation treatment and coagulating sedimentation treatment;
the advanced treatment process comprises the steps of sequentially carrying out USAB anaerobic treatment and activated sludge treatment on the petroleum wastewater subjected to Fenton oxidation treatment.
Preferably, in the petroleum wastewater treatment method, when the petroleum wastewater is drilling wastewater, the petroleum wastewater pretreatment process comprises the steps of sequentially carrying out coagulating sedimentation treatment on the drilling wastewater; it is further preferred that the first and second liquid crystal compositions,the coagulating sedimentation treatment comprises the processes of coagulation, flocculation and sedimentation; the hydraulic retention time of coagulation treatment is 0.8-1.2h, the hydraulic retention time of flocculation treatment is 0.8-1.2h, the hydraulic retention time of precipitation treatment is 5-7h, and the hydraulic load q of precipitation treatment is 0.5-0.9m3/(m2.h)。
Preferably, when the petroleum wastewater is acidizing fracturing wastewater, the petroleum wastewater pretreatment process comprises the steps of sequentially carrying out air floatation treatment and micro-electrolysis treatment on the acidizing fracturing wastewater; further preferably, the hydraulic retention time of the air floatation treatment is 2.5-3.5 h; the hydraulic load q of the air floatation treatment is 1-2m3/(m2.h)。
Preferably, when the petroleum wastewater is acidizing fracturing wastewater, the petroleum wastewater pretreatment process further comprises demulsification treatment; the petroleum wastewater pretreatment process comprises the steps of sequentially performing emulsion breaking treatment, air flotation treatment and micro-electrolysis treatment on the acidized fracturing wastewater; further preferably, the demulsifier for demulsification treatment comprises at least one of an SP-type demulsifier, an AP-type demulsifier and an AE-type demulsifier; still more preferably, the amount of the demulsifier added is 0 to 0.1kg/m3。
Preferably, in the method for treating the petroleum wastewater, when the petroleum wastewater is the acid fracturing wastewater, the aeration rate of micro-electrolysis is 8-12m3/h×m2。
Preferably, in the petroleum wastewater treatment method, when the petroleum wastewater is acid fracturing wastewater, the hydraulic retention time of micro-electrolysis is 10-14 h; further preferably, the hydraulic retention time of the micro-electrolysis is 11-13 h; still further preferably, the hydraulic retention time of the microelectrolysis is 12 h.
Preferably, in the petroleum wastewater treatment method, iron-carbon filler is added into the micro-battery, and the iron-carbon filler can be a commercially available product.
The micro-electrolysis treatment system has good removal efficiency of COD aiming at different waste water, and some waste water can reach 60-70%. For organic wastewater in chemical industry and the like, micro-electrolysis is mainly utilized to change the structure of macromolecular organic matters in the wastewater, destroy organic groups and improve the biochemical performance of the wastewater; meanwhile, a small amount of heavy metal in the organic wastewater can be cut off by using the process, and the stable and good operation of subsequent biochemical treatment is ensured.
The electrode reaction process of the micro-electrolysis process comprises the following steps:
anode (Fe): fe-2 e → Fe2+ E0(Fe2+/Fe)＝-0.44V (1)
Cathode (C): 2H++2e→H2(in acidic solution) E0(Fe2+/Fe)＝-0.44V (2)
When in oxygenation: o is2+4H++4e→2H2O (in acidic solution) E0(O2/H2O)＝+1.23V (3)
O2+2H2O +4E → 4OH- (in alkaline or neutral solution) E0(O2/H2O)＝+0.44V (4)
From the standard electrode potential of the electrode reaction, the corrosion reaction is fastest under the acidic oxygenation condition, and a certain reaction effect is achieved under the alkaline or neutral condition. In actual operation, considering the cost of acid addition, if the COD is directly removed, the pH is adjusted to be acidic, so that a better effect is achieved; if it is intended to improve biodegradability, the pH is adjusted to a point of from 5 to 6, which is economically reasonable. Meanwhile, due to the generation of ferrous iron, the polarization reaction of the anode is overcome to a certain extent, and the electrochemical corrosion process of iron is promoted.
Preferably, in the method for treating the petroleum wastewater, when the petroleum wastewater is drilling wastewater, the pretreatment process of the petroleum wastewater further comprises micro-electrolysis treatment; the petroleum wastewater pretreatment process comprises the steps of sequentially carrying out coagulating sedimentation treatment and micro-electrolysis treatment on the drilling wastewater.
Preferably, in the petroleum wastewater treatment method, the oxidation-reduction potential of Fenton oxidation is 250-450mV in the Fenton oxidation treatment process; more preferably, the oxidation-reduction potential of Fenton oxidation is 300-400 mV.
Preferably, in the method for treating the petroleum wastewater, the hydraulic retention time of Fenton oxidation in the Fenton oxidation treatment process is 20-28 h; further preferably, the hydraulic retention time of Fenton oxidation is 22-26 h; in some preferred embodiments of the invention, the hydraulic retention time for fenton oxidation is 24 h.
In the method for treating the petroleum wastewater, because micro-electrolysis treatment is connected before Fenton oxidation treatment, ferrous iron does not need to be added in the operation process of the Fenton reaction device, and only hydrogen peroxide needs to be added.
Preferably, in the method for treating the petroleum wastewater, in the Fenton oxidation treatment process, the coagulation sedimentation treatment comprises coagulation, flocculation and sedimentation treatment processes; the hydraulic retention time of coagulation treatment is 0.8-1.2h, the hydraulic retention time of flocculation treatment is 0.8-1.2h, the hydraulic retention time of precipitation treatment is 5-7h, and the hydraulic load q of precipitation treatment is 0.5-0.9m3/(m2.h)。
Preferably, in the petroleum wastewater treatment method, the hydraulic retention time of the USAB anaerobic treatment is 100-140h in the advanced treatment process; further preferably, the hydraulic retention time of the USAB anaerobic treatment is 110-; still further preferably, the hydraulic retention time for the USAB anaerobic treatment is 120 h.
Preferably, in the deep treatment process of the petroleum wastewater treatment method, the hydraulic retention time of the activated sludge treatment is 42-54 h; further preferably, the hydraulic retention time of the activated sludge process is 46-50 h; still further preferably, the hydraulic retention time of the activated sludge process is 47-49 h; more preferably, the hydraulic retention time for the activated sludge process is 48 h.
Preferably, in the deep treatment process of the petroleum wastewater treatment method, the activated sludge process treatment process is aerated, and the aeration rate meets the requirement that the volume ratio of air to water in an activated sludge tank is (16-22): 1; further preferably, the aeration amount satisfies the following conditions that the volume ratio of the air to the water in the activated sludge tank is (18-20): 1.
preferably, the petroleum wastewater treatment method further comprises the steps of biological flocculation and sedimentation; the advanced treatment process comprises the steps that the petroleum wastewater after Fenton oxidation treatment is sequentially subjected to USAB anaerobic treatment, activated sludge process treatment, biological flocculation treatment and precipitation treatment; preferably, the microbial flocculant is added in the biological flocculation treatment, the microbial flocculant comprises polyaluminium chloride, polyacrylamide, and high molecular compounds such as glycoprotein, mucopolysaccharide, protein, cellulose and the like, and the microbial flocculant can adopt a commercially available product.
Preferably, the deep treatment process of the petroleum wastewater treatment method can also be that the petroleum wastewater after Fenton oxidation treatment is sequentially subjected to Fenton oxidation treatment and coagulating sedimentation treatment; when the conductivity of the effluent after the Fenton oxidation treatment process is more than 5000 mus/cm, the advanced treatment process comprises the steps of sequentially carrying out the Fenton oxidation treatment and the coagulating sedimentation treatment on the petroleum wastewater after the Fenton oxidation treatment; further preferably, the hydraulic retention time of the Fenton oxidation treatment is 22-26h, the oxidation-reduction potential of the Fenton oxidation is 350-550mV, and the coagulation-precipitation treatment comprises coagulation, flocculation and precipitation treatment processes; the hydraulic retention time of coagulation treatment is 0.8-1.2h, the hydraulic retention time of flocculation treatment is 0.8-1.2h, the hydraulic retention time of precipitation treatment is 5-7h, and the hydraulic load q of precipitation treatment is 0.5-0.9m3/(m2.h)。
Preferably, the method for treating the petroleum wastewater has the pH value of the drilling wastewater of 6-12, the COD of 7000mg/L, the petroleum of 50-500mg/L, the suspended matters of 70-800mg/L, the hexavalent chromium of 0-0.5mg/L and the chloride ions of 300-2500 mg/L.
Preferably, the pH value of the acid fracturing wastewater is 1-6, the COD is 8000mg/L, the petroleum is 50-500mg/L, the suspended matters are 20-300mg/L, the ammonia nitrogen is 0-2.0mg/L, and the chloride ions are 2000 mg/L.
The invention has the beneficial effects that:
the invention carries out separate treatment according to the water quality characteristics of different procedures of the petroleum wastewater, and compared with mixed treatment, the treatment effect of the petroleum wastewater treatment method is better, the treated wastewater can meet the requirements that the petroleum is less than or equal to 4mg/L, the COD is less than or equal to 100mg/L, the wastewater treatment cost is lower, and the operation is more stable.
The micro-electrolysis tank adopts an aeration type iron-carbon micro-electrolysis treatment process, and utilizes hydrogen or hydroxyl free radicals produced in an aerobic state to combine with ferrous ions to play a Fenton oxidation effect, so that organic matters which are difficult to biodegrade can be removed, and the biodegradability can be improved; the pulse bulking technology can ensure that the bed body is in a uniform state, maintain the uniform void ratio of the bed body, reduce the resistance loss and effectively prevent the bed body from hardening, short circuit and dead zones; the contact surface and the reaction surface of the microelectrode can be cleaned and updated, and the electrochemical reaction effect can be improved and maintained; has the mechanism and function of accelerating electrochemical reaction, and obviously improves the treatment efficiency of the bed body; the iron filings as filler can be supplemented at any time, the homogeneity of the bed body filler is kept, the labor intensity of iron supplement is greatly reduced, and the service life of the equipment is prolonged.
Drawings
FIG. 1 is a schematic view of an example of a petroleum wastewater treatment system.
Detailed Description
The present invention will be described in further detail with reference to specific examples. The starting materials or the apparatus used in the examples are, unless otherwise specified, either conventionally commercially available or may be obtained by methods known in the art. Unless otherwise indicated, the testing or testing methods are conventional in the art.
The petroleum wastewater treatment system of the embodiment of the invention is shown in figure 1, according to different operation procedures, the petroleum wastewater is divided into drilling wastewater and acidizing fracturing wastewater, the drilling wastewater sequentially passes through a first coagulation tank, a first flocculation tank and a first sedimentation tank, and when the COD concentration of the drilling wastewater inlet water is higher, the outlet water of the first sedimentation tank can also enter a first micro-electrolysis tank in order to ensure the effect of subsequent water treatment; sequentially passing the acidified fracturing wastewater through a first pH adjusting tank, an air flotation tank and a first micro-electrolysis tank, and adding a demulsifier into the first pH adjusting tank; the effluent of the first sedimentation tank and the effluent of the first micro-electrolysis tank sequentially pass through a first Fenton reaction device, a second coagulation tank, a second flocculation tank and a second sedimentation tank; when the effluent of the first sedimentation tank enters a first micro-electrolysis tank, the effluent of the first micro-electrolysis tank sequentially passes through a first Fenton reaction device, a second coagulation tank, a second flocculation tank and a second sedimentation tank; the effluent of the second sedimentation tank passes through a USAB anaerobic tank, an activated sludge tank, a dosing tank and a third sedimentation tank in sequence, and finally the wastewater is discharged; and (3) detecting the conductivity of the effluent of the second sedimentation tank, and when the conductivity is more than 5000 mu s/cm, enabling the effluent of the second sedimentation tank to enter a second Fenton reaction device, a third coagulation tank, a third flocculation tank and a fourth sedimentation tank, and finally discharging the wastewater.
Example 1
The petroleum wastewater comprises drilling wastewater and acidizing fracturing wastewater, and the specific water quality is as follows.
The water quality of a drilling wastewater is shown in table 1 below:
TABLE 1 drilling wastewater raw water quality
Figure BDA0003446134090000051
The water quality of a certain acidified frac wastewater is shown in table 2 below:
TABLE 2 quality of acidified frac wastewater raw water
Figure BDA0003446134090000052
In this example, the petroleum wastewater treatment system shown in FIG. 1 was used, and the petroleum wastewater was treated by the following steps;
the pretreatment process of the drilling wastewater comprises the following steps: the drilling wastewater sequentially passes through a first coagulation tank, a first flocculation tank and a first sedimentation tank; before entering a first coagulation tank, the drilling wastewater is subjected to pH adjustment, the pH value is 8-9 when entering the first coagulation tank, the hydraulic retention time of the first coagulation tank is 1h, and blast stirring is adopted; the hydraulic retention time of the first flocculation tank is 1h, and mechanical stirring is adopted; the hydraulic retention time of the first sedimentation tank is 6h, and the hydraulic load q of the first sedimentation tank is 0.5-0.9m3/(m2.h)；
The pretreatment process of the acid fracturing wastewater comprises the following steps: the acidized fracturing wastewater sequentially passes through a first pH adjusting tank, an air flotation tank and a first micro-electrolysis tank; the pH value of the first pH adjusting pool is 8-8.5, and an SP type demulsifier is added, wherein the adding amount of the demulsifier is 0-0.1kg/m3The hydraulic retention time is 1h, and blast stirring is adopted; the hydraulic retention time of the air floatation tank is 3h, and the hydraulic load q of the air floatation tank is 1-2m3/(m2H); the pH of the effluent from the air floatation tank is adjusted before the effluent enters a first micro-electrolysis tank, the pH is 4-5.5 when the effluent enters the first micro-electrolysis tank, and the water power of the first micro-electrolysis tankThe retention time is 12h, and a gas-water combined flushing and stirring mode is adopted;
fenton oxidation treatment process: the effluent of the first sedimentation tank and the effluent of the first micro-electrolysis tank sequentially pass through a first Fenton reaction device, a second coagulation tank, a second flocculation tank and a second sedimentation tank; the hydraulic retention time of the first Fenton reaction device is 24 hours, and mechanical stirring is adopted; the hydraulic retention time of the second coagulation tank is 1h, and blast stirring is adopted; the hydraulic retention time of the second flocculation tank is 1h, and blast stirring is adopted; the hydraulic retention time of the second sedimentation tank is 6h, and the hydraulic load q of the second sedimentation tank is 0.5-0.9m3/(m2.h)；
Advanced treatment process 1: effluent of the second sedimentation tank sequentially passes through a USAB anaerobic tank, an activated sludge tank, a dosing tank and a third sedimentation tank, and wastewater is discharged; the hydraulic retention time of the USAB anaerobic tank is 120 h; the hydraulic retention time of the activated sludge tank is 48h, aeration is carried out in the activated sludge tank, and the aeration rate meets the gas-water ratio (18-20): 1; adding a microbial flocculant into the dosing pool, wherein the hydraulic retention time of the dosing pool is 1h, and the dosing pool is mechanically stirred; the hydraulic retention time of the third sedimentation tank is 6h, and the hydraulic load q of the third sedimentation tank is 0.5-0.9m3/(m2H); and discharging the effluent of the third sedimentation tank.
And (3) advanced treatment process 2: effluent of the second sedimentation tank sequentially passes through the second Fenton reaction device, the third coagulation tank, the third flocculation tank and the fourth sedimentation tank, and wastewater is discharged; the hydraulic retention time of the second Fenton reaction device is 24 hours, and mechanical stirring is adopted; the hydraulic retention time of the third coagulation tank is 1h, and blast stirring is adopted; the hydraulic retention time of the third flocculation tank is 1h, and mechanical stirring is adopted; the hydraulic retention time of the fourth sedimentation tank is 6h, and the hydraulic load q of the fourth sedimentation tank is 0.5-0.9m3/(m2H); and discharging the effluent of the fourth sedimentation tank.
The contaminant removal rates for the various treatment stages are shown in table 3 below.
TABLE 3 Effect of different treatment stages
Figure BDA0003446134090000061
The waste water treated by the petroleum waste water treatment method can meet the requirements that petroleum is less than or equal to 4mg/L and COD is less than or equal to 100 mg/L.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. The petroleum wastewater treatment method is characterized in that the petroleum wastewater enters a Fenton oxidation treatment process and an advanced treatment process after being subjected to a pretreatment process and is discharged;
the Fenton oxidation treatment process comprises the steps that the petroleum wastewater after pretreatment is sequentially subjected to Fenton oxidation treatment and coagulating sedimentation treatment;
the advanced treatment process comprises the steps of sequentially carrying out USAB anaerobic treatment and activated sludge treatment on the petroleum wastewater after Fenton oxidation treatment.
2. The method for treating petroleum wastewater according to claim 1, wherein when the petroleum wastewater is drilling wastewater, the petroleum wastewater pretreatment process comprises the sequential coagulation and precipitation treatment of the drilling wastewater.
3. The method for treating petroleum wastewater according to claim 1, wherein when the petroleum wastewater is acid fracturing wastewater, the pretreatment process of the petroleum wastewater comprises sequentially subjecting the acid fracturing wastewater to air flotation treatment and micro-electrolysis treatment.
4. The method for treating petroleum wastewater according to claim 3, wherein the petroleum wastewater pretreatment process further comprises a demulsification treatment; the petroleum wastewater pretreatment process comprises the steps of sequentially carrying out demulsification treatment, air flotation treatment and micro-electrolysis treatment on the acidized fracturing wastewater.
5. The method for treating petroleum wastewater according to claim 3, wherein the aeration rate of the microelectrolysis is 8 to 12m3/h×m2。
6. The petroleum wastewater treatment method according to claim 5, wherein the hydraulic retention time of the microelectrolysis is 10 to 14 hours.
7. The petroleum wastewater treatment method according to claim 2, wherein said petroleum wastewater pretreatment process further comprises microelectrolysis treatment; the petroleum wastewater pretreatment process comprises the steps of sequentially carrying out coagulating sedimentation treatment and micro-electrolysis treatment on the drilling wastewater.
8. The method for treating petroleum wastewater according to claim 1, wherein the oxidation-reduction potential of Fenton oxidation is 250-450mV during the Fenton oxidation treatment.
9. The method as claimed in claim 1, wherein the hydraulic retention time of the USAB anaerobic treatment in the advanced treatment process is 100-140 h.
10. The method for treating petroleum wastewater according to claim 1, wherein the advanced treatment process is a process in which the petroleum wastewater after Fenton oxidation treatment is sequentially subjected to Fenton oxidation treatment and coagulation sedimentation treatment.
CN202111656680.9A 2021-12-30 2021-12-30 Petroleum wastewater treatment method Pending CN114249503A (en)

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CN104310715A (en) * 2014-11-04 2015-01-28 唐山金利海生物柴油股份有限公司 Treatment method for biodiesel waste water
CN205442971U (en) * 2016-01-05 2016-08-10 宜兴市永创环保科技有限公司 High concentration, refractory wastewater processing system
CN106673300A (en) * 2016-12-16 2017-05-17 三达膜科技（厦门）有限公司 Treatment method for wastewater of forestry chemical industry
CN111153564A (en) * 2020-02-26 2020-05-15 广东广深环保科技有限公司 System and method for treating emulsion wastewater

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990068767A (en) * 1999-06-18 1999-09-06 안석훈 Wastewater Treatment Method Using Fenton's Oxidation
CN104310715A (en) * 2014-11-04 2015-01-28 唐山金利海生物柴油股份有限公司 Treatment method for biodiesel waste water
CN205442971U (en) * 2016-01-05 2016-08-10 宜兴市永创环保科技有限公司 High concentration, refractory wastewater processing system
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