CN111689643A - Treatment method for oily sewage of finished oil depot - Google Patents

Treatment method for oily sewage of finished oil depot Download PDF

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Publication number
CN111689643A
CN111689643A CN201910200042.2A CN201910200042A CN111689643A CN 111689643 A CN111689643 A CN 111689643A CN 201910200042 A CN201910200042 A CN 201910200042A CN 111689643 A CN111689643 A CN 111689643A
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China
Prior art keywords
oil depot
oily sewage
finished oil
reactor
carbon
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CN201910200042.2A
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Chinese (zh)
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CN111689643B (en
Inventor
唐晓丽
宋项宁
姚猛
张志远
郭亚逢
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China Petroleum and Chemical Corp
Sinopec Safety Engineering Research Institute Co Ltd
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China Petroleum and Chemical Corp
Sinopec Qingdao Safety Engineering Institute
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/40Devices for separating or removing fatty or oily substances or similar floating material
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104Devices therefor; Their operating or servicing
    • C02F1/46109Electrodes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104Devices therefor; Their operating or servicing
    • C02F1/46109Electrodes
    • C02F2001/46133Electrodes characterised by the material
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104Devices therefor; Their operating or servicing
    • C02F1/46109Electrodes
    • C02F2001/46133Electrodes characterised by the material
    • C02F2001/46138Electrodes comprising a substrate and a coating
    • C02F2001/46142Catalytic coating
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • C02F2101/32Hydrocarbons, e.g. oil
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/02Aerobic processes

Abstract

The invention relates to a method for treating oily sewage of a finished oil depot, which mainly solves the problems of low COD removal rate and secondary pollution in the prior art. The invention adopts a method for treating oily sewage of a finished oil depot, the oily sewage of the finished oil depot is treated by a coalescence degreaser, an iron-carbon micro-electrolysis, an electro-catalytic reactor and a BAF reactor in sequence and then discharged, the petroleum content of effluent is less than 4mg/L, and the COD is less than 70 mg/L; the technical scheme that the iron-carbon microelectrolysis is filled with the iron-carbon filler and the electrocatalysis reactor is filled with the activated carbon catalyst well solves the problems and can be used for treating oily sewage of a finished oil depot.

Description

Treatment method for oily sewage of finished oil depot
Technical Field
The invention relates to a method for treating oily sewage of a finished oil depot.
Background
The oil-containing sewage of the finished oil depot mainly comes from initial rainwater of the depot area, ground washing water, oil tank cutting water, tank cleaning operation drainage, loading and unloading operation drainage and the like. The water quality particularity of the oily sewage of the finished oil depot lies in that a large amount of gasoline and diesel oil additives such as methyl tert-butyl ether (MTBE) and the like dissolved in water are added besides petroleum, so that the COD concentration of the oily sewage of the finished oil depot is high. The existing oil depot is mainly treated by adopting an oil separation tank-coagulation air flotation-filtration process, the coagulation air flotation process in the set of process flow can remove colloid substances such as dispersed oil, emulsified oil and the like in the sewage by adding conventional coagulants such as polyaluminium chloride (PAC), Polyacrylamide (PAM) and the like and combining an air flotation device, and after the oil-containing sewage of the oil depot is subjected to oil removal treatment through water quality analysis, a large amount of benzene series substances are still contained in the water, so that the organic matter (COD) in the sewage seriously exceeds the standard.
The utility model discloses a light oil sewage integrated processing device (grant No. CN2892839Y) discloses a processing apparatus of oily sewage that light oil depot operation produced, and the device uses materialization processing as the core, realizes through processes such as swash plate separation, filtration, coalescence separation and absorption that the discharged water reaches national one-level and discharges and retrieve dispersion oil and emulsified oil simultaneously. However, the core COD removal section of the device is an adsorption section, and in order to meet the drainage requirement, the volume of the section is set to be larger, and the adsorbent is easy to saturate and lose efficacy. The invention discloses a treatment method of finished oil depot sewage (No. CN104129874B), which utilizes filtration, two-stage coalescence and electric adsorption to achieve a better treatment effect and simultaneously avoid excessive use of medicaments, but the method mainly aims at the low-concentration finished oil depot oily sewage, wherein a coalescence separator mainly aims at partial dispersed oil and emulsified oil in the oily sewage and has a limited COD removal effect, and an electric adsorption reactor utilizes the principle that the adsorption capacity of activated carbon is increased under the action of an electric field, so that the treatment efficiency of COD is low, and the problem of saturated adsorption of the activated carbon exists.
Disclosure of Invention
The invention aims to solve the technical problems of low COD removal rate and secondary pollution in the prior art, and provides a novel method for treating oily sewage of a finished oil depot, which has the advantages of high COD removal rate and no secondary pollution.
In order to solve the problems, the technical scheme adopted by the invention is as follows: a method for treating oily sewage of a finished oil depot comprises the steps of treating the oily sewage of the finished oil depot by a coalescence degreaser, iron-carbon micro-electrolysis, an electro-catalytic reactor and a BAF reactor in sequence and then discharging, wherein the content of petroleum in effluent is less than 4mg/L, and the COD is less than 70 mg/L; wherein, iron-carbon microelectrolysis is filled with iron-carbon filler, and the electro-catalytic reactor is filled with activated carbon catalyst.
In the technical scheme, preferably, the coalescence degreaser, the iron-carbon microelectric interpretation, the electrocatalysis reactor, the BAF reactor and the electric control equipment are integrated on a skid-mounted base.
In the above technical solution, preferably, the coalescing oil remover is composed of a pre-filter, a first-stage coalescing filter, and a second-stage coalescing filter.
In the above technical scheme, preferably, the prefilter is filled with walnut shells or polypropylene fiber pellets; the first-stage coalescence filter is filled with a modified polypropylene corrugated plate or a ceramic corrugated plate; the second-stage coalescence filter is filled with stainless steel fiber or glass fiber filler, and the coalescence degreaser is provided with an oil collecting cavity.
In the technical scheme, preferably, iron in the iron-carbon filler used in the iron-carbon microelectrolysis accounts for 70-90 wt%, carbon accounts for 5-15 wt%, and metal active components Mn, Cu and Ni account for 5-15 wt%.
In the above technical scheme, preferably, the electrocatalysis reactor is composed of a negative electrode, a positive electrode, a negative electrode, a catalyst filler, an aeration device and a back washing device; wherein, the cathode and anode are coated with Sb and Sn titanium electrodes, the catalyst particles are Mn, Cu and Ni loaded active carbon catalysts, the bottom of the reactor is provided with an aeration pipe connected with a fan, sewage enters from the bottom of the reactor and flows up uniformly through a water distribution plate to fill the whole reactor.
In the technical scheme, preferably, the voltage of the electrocatalysis reactor is 10-20V, the voltage in the regeneration process of the catalytic particles is 10-30V, and the regeneration time is 20-120 min.
In the above technical scheme, preferably, the BAF reactor is filled with hydrophilic polymer filler, and is provided with an aeration device and a back-flushing device.
In the technical scheme, preferably, the oil content of the oily sewage of the finished oil depot is 10-100 mg/L, and the COD is 1000-3000 mg/L.
In the technical scheme, preferably, the effluent petroleum is less than 4mg/L, and the COD is less than 70 mg/L.
According to the invention, the finished product oil depot sewage is treated by the coalescence degreaser, the iron-carbon micro-electrolysis, the electro-catalytic reactor and the BAF reactor in sequence and then discharged, the effluent oil content is less than 4mg/L, and the COD is less than 50mg/L, a physicochemical method and a biological method are combined, and meanwhile, the method has a good removal rate on the oil content and the COD, can ensure that the finished product oil depot oil-containing sewage is discharged after reaching the standard, and achieves a good technical effect.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention.
In fig. 1, a centrifugal pump; 2. a pre-filter; 3. a first stage coalescing filter; 4. a secondary coalescing filter; 5. iron-carbon micro-electrolysis; 6. an electrocatalytic reactor; 7. a direct current power supply; 8. a cathode and an anode; 9. a catalyst filler; 10. a blower; BAF reactor.
The present invention will be further illustrated by the following examples, but is not limited to these examples.
Detailed Description
Example one
As shown in figure 1, the mixed oil product (gasoline and diesel oil) finished product oil depot drainage is treated, and the drainage sequentially passes through a coalescence degreaser, an iron-carbon micro-electrolysis, an electro-catalytic reactor and a BAF reactor. The coalescence degreaser consists of a prefilter, a first-stage coalescence filter and a second-stage coalescence filter, wherein the prefilter is filled with walnut shells or polypropylene fiber pellets; the first-stage coalescence filter is filled with a modified polypropylene corrugated plate or a ceramic corrugated plate; the second-stage coalescence filter is filled with fillers such as stainless steel fibers or glass fibers. The coalescence degreaser is provided with an oil collecting cavity. The coalescence degreaser, the iron-carbon microelectric interpretation, the electrocatalysis reactor, the BAF reactor and the electric control equipment are integrated on a skid-mounted base. The electro-catalytic reactor consists of a negative electrode, a positive electrode, a negative electrode, catalyst filler, an aeration device and a back washing device; wherein, the cathode and anode are coated with Sb and Sn titanium electrodes, the catalyst particles are Mn, Cu and Ni loaded active carbon catalysts, the bottom of the reactor is provided with an aeration pipe connected with a fan, sewage enters from the bottom of the reactor and flows up uniformly through a water distribution plate to fill the whole reactor.
Removing floating oil and dispersed oil from sewage through a coalescence degreaser, then performing iron-carbon micro-electrolysis to break bonds of macromolecular substances to decompose the macromolecular substances into micromolecular substances and remove part of COD, then entering an electro-catalytic reactor to finish removing most of COD, and then entering a BAF reactor to perform biodegradation. In the iron-carbon filler used in the iron-carbon microelectrolysis, 20 wt% of iron, 75 wt% of carbon and 5 wt% of metal active components of Mn, Cu and Ni are contained.
The method is utilized to drain a mixed oil product (gasoline and diesel oil) finished oil depot with 50mg/L, COD content of oil and 1600mg/L content of oil, the voltage applied to the electrocatalysis reactor is adjusted to be 10V, the oil is less than or equal to 10mg/L after the treatment by the coalescence degreaser, the oil in the final effluent is less than or equal to 4mg/L, and the COD is less than or equal to 50 mg/L.
Example two
According to the procedure described in example 1, the iron-carbon filler used in iron-carbon microelectrolysis contains 20 wt% of iron, 75 wt% of carbon and 5 wt% of metal active components Mn, Cu and Ni. The high-efficiency integrated treatment device for the sewage of the finished oil depot is used for draining the finished oil depot of the mixed oil product (gasoline and diesel oil) with the petroleum content of 92mg/L, COD of 2650mg/L, the voltage applied to the electrocatalysis reactor is adjusted to be 20V, the petroleum is less than or equal to 20mg/L after the treatment of the coalescence degreaser, the final effluent petroleum is less than or equal to 4mg/L, and the COD is less than or equal to 50 mg/L.
EXAMPLE III
According to the procedure described in example 1, the iron-carbon filler used in iron-carbon microelectrolysis contains 20 wt% of iron, 75 wt% of carbon and 5 wt% of metal active components Mn, Cu and Ni. The high-efficiency integrated treatment device for the sewage of the finished oil depot is utilized to drain the finished oil depot of the mixed oil products (gasoline and diesel oil) with the petroleum content of 93mg/L, COD and the content of 2683mg/L, the applied voltage of the electro-catalytic reactor is adjusted to 10V, the petroleum is less than or equal to 20mg/L after the treatment of the coalescence degreaser, the final effluent petroleum is less than or equal to 4mg/L, and the COD is less than or equal to 70 mg/L.
[ COMPARATIVE EXAMPLES ]
The method utilizes the air flotation and the contact oxidation method to treat the mixed oil product (gasoline and diesel oil) finished product oil depot drainage with the petroleum content of 93mg/L, COD and the petroleum content of 2683mg/L, the treated sewage is 10mg/L of petroleum and the COD is 210 mg/L.

Claims (10)

1. A method for treating oily sewage of a finished oil depot comprises the steps of treating the oily sewage of the finished oil depot by a coalescence degreaser, iron-carbon micro-electrolysis, an electro-catalytic reactor and a BAF reactor in sequence and then discharging, wherein the content of petroleum in effluent is less than 4mg/L, and the COD is less than 70 mg/L; wherein, iron-carbon microelectrolysis is filled with iron-carbon filler, and the electro-catalytic reactor is filled with activated carbon catalyst.
2. The method for treating oily sewage in a finished oil depot according to claim 1, wherein the coalescence degreaser, the iron-carbon microelectrochemical interpretation, the electro-catalytic reactor, the BAF reactor and the electric control equipment are integrated on a skid-mounted base.
3. The method for treating oily sewage of a finished oil depot according to claim 1, wherein the coalescence degreaser is composed of a prefilter, a first-stage coalescence filter and a second-stage coalescence filter.
4. The method for treating oily sewage of a finished oil depot according to claim 3, wherein the prefilter is filled with walnut shells or polypropylene fiber pellets; the first-stage coalescence filter is filled with a modified polypropylene corrugated plate or a ceramic corrugated plate; the second-stage coalescence filter is filled with stainless steel fiber or glass fiber filler, and the coalescence degreaser is provided with an oil collecting cavity.
5. The method for treating oily sewage of a finished oil depot according to claim 1, wherein iron in the iron-carbon filler used in iron-carbon microelectrolysis accounts for 70-90 wt%, carbon accounts for 5-15 wt%, and metal active components Mn, Cu and Ni account for 5-15 wt%.
6. The method for treating oily sewage in a finished oil depot according to claim 1, wherein the electro-catalytic reactor comprises a negative electrode, a catalyst filler, an aeration device and a back-flushing device; wherein, the cathode and anode are coated with Sb and Sn titanium electrodes, the catalyst particles are Mn, Cu and Ni loaded active carbon catalysts, the bottom of the reactor is provided with an aeration pipe connected with a fan, sewage enters from the bottom of the reactor and flows up uniformly through a water distribution plate to fill the whole reactor.
7. The method for treating oily sewage of a finished oil depot according to claim 1, wherein the voltage of the electro-catalytic reactor is 10-20V, the voltage in the regeneration process of catalytic particles is 10-30V, and the regeneration time is 20-120 min.
8. The method for treating oily sewage in a finished oil depot according to claim 1, wherein the BAF reactor is filled with hydrophilic polymer filler and is provided with an aeration device and a back-flushing device.
9. The method for treating oily sewage of a finished oil depot according to claim 1, wherein the oil content of the oily sewage of the finished oil depot is 10-100 mg/L, and the COD is 1000-3000 mg/L.
10. The method for treating oily sewage in a finished oil depot according to claim 1, wherein the petroleum content in the effluent is less than 4mg/L and the COD is less than 50 mg/L.
CN201910200042.2A 2019-03-15 2019-03-15 Treatment method for oily sewage of finished oil depot Active CN111689643B (en)

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