CN100509662C - Oil refinery sewage treatment and reusing process system and operation method thereof - Google Patents
Oil refinery sewage treatment and reusing process system and operation method thereof Download PDFInfo
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- CN100509662C CN100509662C CNB2006100890278A CN200610089027A CN100509662C CN 100509662 C CN100509662 C CN 100509662C CN B2006100890278 A CNB2006100890278 A CN B2006100890278A CN 200610089027 A CN200610089027 A CN 200610089027A CN 100509662 C CN100509662 C CN 100509662C
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Abstract
The invention provides a process system for disposal and recycling of sewage in oil plants and the corresponding operation method, wherein the process system comprises a disposal unit for sewage of superhigh concentration, a disposal unit for sewage of high concentration, a disposal unit for sewage of low concentration and a sewage recycling unit. The invention is characterized in that: after treated by an oxidation tower and a sequencing bioreactor, the sewage of superhigh concentration is effluent and incorporated in the sewage of high concentration; after treated by a separation tank, a floatation tank and a biological aerated filter, one part of the sewage of the high concentration which comes up to the standards is released, another part is used for dilution water of the sequencing bioreactor, and last part is incorporated in the sewage of low concentration; after treated by a separation tank, a floatation tank and a biological aerated filter, one part of the sewage of low concentration is effluent and used for recycling in a reclaimed water system, one part is incorporated in the sewage of high concentration, another part is used for dilution water of the sequencing bioreactor, and last part which comes up to the standards is released. The process system of the invention realizes respective treatment and water recycling of sewage of high and low concentration in oil plants, can ensure that the effluent water quality is stable and qualified and the cost of disposal and recycling of sewage is reduced.
Description
Technical field
The present invention relates to waste disposal plant and method, particularly system and the operation method that sewage from oil refinery is handled and reuse combines.
Background technology
Oil refining sewerage is a class industrial sewage that produces in the processes such as crude refining, processing and oil product washing, the different sewage that can produce the different quality and the water yield of technological process.Can roughly be divided into high-concentration sewage and sewage of low concentration two portions according to pollution level.High-concentration sewage comprises that refinery electric desalting workshop section sewage, alkaline residue workshop section sewage and stripping purify waste water etc.The characteristics of high-concentration sewage are water quality inferiorities, and sulphur, phenol, ammonia-nitrogen content are higher, and COD and saliferous account for 70% and 50% of sewage total amount respectively; The water yield is little, only accounts for 15% of sewage from oil refinery total amount; Intractability is big.Sewage of low concentration comprises the draining of technique unit: as oil-containing condensed water, the draining of pump stuffing box, laboratory sewer and the sanitary sewage etc. that the water-and-oil separator draining of production equipment etc., heat power engineering system do not reclaim, the characteristics of sewage of low concentration are that water quality is better, the water yield big, handle and be easier to.Since 20th century six the seventies, the oil refining enterprise of China generally all adopts " oil removal-flotation-biochemistry " " old three covers " treatment process, with high-concentration sewage and sewage of low concentration combination treatment, because high-concentration sewage often impacts to biochemical treatment apparatus, increased the difficulty of sewage biochemical treatment, cause the not high even long-time running of biochemical treatment apparatus efficient not, not only influence qualified discharge, and realize that to oil refining sewerage reuse raises obstacles.
Therefore, the effective sewage from oil refinery of exploiting economy is handled and reuse technology, water quality characteristic according to different sewage, and different application target (reuse or discharging), accomplish to high-concentration sewage and sewage of low concentration handle respectively, separate-recycling, the sewage of low concentration that accounts for total amount about 85% is handled easily, and effluent quality is guaranteed, for investment and the working cost that reduces the reusing sewage facility significantly creates favorable conditions.This has become the important topic that the efforts at environmental protection person of petroleum chemical enterprise pays close attention to.
Consulted the U.S. chemical abstract database at interior domestic and international 10 patents, bibliographic data base, from the information that obtains, the treatment process about oil refining sewerage of bibliographical information has a lot, but all concentrate on one or more special sewage of a certain art breading, seldom seeing relevant is starting point with whole sewage from oil refinery system, considers the research report and the patented technology of process optimization as a whole.As:
" petrochemical complex environment protection " the 2nd phase in 2003 has been introduced the application of BAF technology in the oil refining sewerage advanced treatment.The data analysis that comes according to test run 3 wheat harvesting periods shows that BAF (BAF) is good to the removal effect of ammonia nitrogen, and COD is also had certain removal effect, and it is feasible technically to be applied to advanced Treatment for Refinery Waste Water.But the stable water outlet of BAF is subjected to the influence of influent quality bigger.To guarantee in this technology actual motion that the second pond water outlet meets the water inlet requirement in BAF pond, just can make the BAF maximum possible bring into play its effect, reduce follow-up unitary processing pressure.
CN 1644522A has reported membrane-flocculation sediment sewage treatment systems, at first adopts membrane bioreactor sewage treatment, handles through flocculation sediment technology again, reaches emission request thereby make general technology be difficult to handle sewage up to standard.Adopt the shortcoming of membrane technique processing petroleum refining industry sewage to be that this technology is domestic at the early-stage, there is not long playing experience many places in test or small-scale operation phase, and advance film pretreatment technology long flow path, the investment height of sewage before.Therefore adopt membrane process to handle sewage from oil refinery and also need to do further experimental study.
CN 200310103223.2 has reported a kind of treatment process of high-concentration industrial organic sewage, adopts anaerobic biofilter+Fenton reagent oxidation+contact oxidation method that high concentration organic sewage is handled, but the water outlet qualified discharge.Shortcoming is that Fenton reagent costs an arm and a leg, operation and process cost height.Apply to the oil refining sewerage treatment system and also need make up other technology.
Summary of the invention
The present invention is directed to the above problem that prior art exists, propose a kind of refinery high-concentration sewage, make that to efflux water conditioning qualified with sewage of low concentration is handled respectively, the system of separate-recycling, and reduction wastewater treatment and reuse expense.
The present invention also proposes the operation method of said system.
Sewage from oil refinery provided by the invention is handled and reclaiming system, form by ultrahigh concentration sewage disposal unit, high-concentration sewage processing unit, sewage of low concentration processing unit and reusing sewage unit, ultrahigh concentration sewage disposal unit comprises wet oxidation tower and sequence bioreactor in order, the high-concentration sewage processing unit comprises oil trap, air flotation pool and BAF in order, the sewage of low concentration processing unit comprises oil trap, air flotation pool and aeration tank in order, and the reusing sewage unit comprises strainer, sterilization pond and chemical treatment medicine system; Wherein, the unitary water outlet pipeline of ultrahigh concentration sewage disposal is communicated with the back with water inlet line of high-concentration sewage processing unit; The water outlet pipeline of high-concentration sewage processing unit has three strands, and one leads to sewage draining exit, and one links to each other with the back with water inlet line of sequence bioreactor in the ultrahigh concentration sewage disposal unit, and another strand links to each other with the back with water inlet line of sewage of low concentration processing unit; The water outlet pipeline of sewage of low concentration processing unit has four strands, one leads to sewage draining exit, one is communicated with the back with water inlet line of sequence bioreactor in the ultrahigh concentration sewage disposal unit, another strand is communicated with the back with water inlet line of high-concentration sewage processing unit, and one is by reusing sewage unit communication loop water system again.
Sewage from oil refinery provided by the invention is handled and the operation method of reclaiming system comprises:
Ultrahigh concentration sewage is carried out a biological disposal upon through wet oxidation tower and sequence bioreactor, and the SBR water outlet is incorporated high-concentration sewage into and is further handled; After oil trap, air flotation pool and BAF were handled, be divided into three parts: a part of qualified discharge, a part were used as the dilution water of sequence bioreactor, and another part is incorporated sewage of low concentration into high-concentration sewage; Sewage of low concentration is after handle oil removal, air supporting, aeration tank, part water outlet by filtration, sterilization, add method such as chemical agent and make the water quality after the processing meet the reuse requirement, enter circulating water system, a part is incorporated high-concentration sewage in addition, some is as the dilution water of SBR, a part of again qualified discharge.
Said ultrahigh concentration sewage comes from liquefied gas alkali cleaning water, gasoline, kerosene and diesel caustic washing water, or its combined sewage, and COD is dense, and content is approximately 250,000-350,000 mg/L.
Said high-concentration sewage comes from refinery electric desalting workshop section's sewage or stripping is purified waste water, or other organism, sulphur, phenol, sewage that ammonia-nitrogen content is high, perhaps their combined sewage, mixed C OD is greatly more than 400mg/L, below 250,000 mg/L generally speaking.
Said sewage of low concentration comes from the water-and-oil separator draining of production equipment, oil-containing condensed water, the draining of pump stuffing box, laboratory sewer or the sanitary sewage that heat power engineering system does not reclaim, perhaps their combined sewage, these sewage generally mixed C OD less than 400mg/L.
Wherein, but oil trap with removing the bigger thick dispersiveness oil slick grain of diameter in the sewage.There is relative density difference because of between itself and the water, can floats to the water surface and removed by the floating naturally method that goes up.
Air flotation pool is to utilize the micro-bubble of high dispersing to go to adhere to pollutants in sewage as carrier, and it is removed to the water surface with air bubble buoyancy, mainly separates oil in water emulsion and the trickle suspended solid of hydrophobicity in the sewage.
BAF (different with common aeration tank) also is submerged BAF, granular filler contact-oxidation pool, integrate biological degradation and solid-liquid separation, by biology aerobic process degrading organic contaminant in wastewater, be a kind of advanced bio-reactor that is used for sewage second-level processing and advanced treatment.
Wet oxidation is to be applicable to the senior liquid-phase oxidation technology of handling high density, used water difficult to degradate, and under high temperature (120-320 ℃) high pressure (0.76-21MPa) selective oxidation of sulfur containing compounds in particular being become Sulfothiorine, sodium bisulfite, sodium pyrosulfate, organic pollutant (phenol, naphthenic acid) oxygenolysis is the chemical process of carbonic acid gas and water or small organic molecule.
Sequence bioreactor also is SBR, activated sludge reactor intermittently, and the characteristics of have plug-flow, anaerobic-aerobic operation concurrently, being interrupted water inlet are a kind of simple and easy, low consumption and sewage-treating reactor fast.
The present invention possesses following outstanding advantage:
1, unmanageable high-concentration sewage of refinery and easy to handle sewage of low concentration are handled respectively by water quality, and sewage of low concentration after handling, appropriateness is back to circulating water system, realized dirtyly dividing and ruling, separate-recycling, make effluent quality guaranteed, for investment and the working cost that reduces the reusing sewage facility significantly creates favorable conditions.
2, technical process of the present invention is simple, feasible, and can carry out pipeline between the high and low concentration sewage disposal unit and switch, so the processing efficiency height, and can effectively utilize refinery's original " old three covers " process facility.
3, the ingenious basicity of utilizing the water outlet of high density qualified discharge has been saved medicament expense usefulness.
4, lower concentration water part up to standard drains into the high density unit, makes high density unit influent quality stable, guarantees that its water outlet can qualified discharge.
5, the dilution water of SBR has been saved the fresh water consumption from Sewage treatment systems inside
Description of drawings
Fig. 1 is that sewage from oil refinery of the present invention is handled and recovering process flow.
Embodiment
Ultrahigh concentration sewage disposal cell process flow process:
Combined sewages such as liquefied gas alkali cleaning water, gasoline, kerosene and diesel caustic washing water are called ultrahigh concentration sewage, COD is dense, content is approximately 250,000-350,000 mg/L, it is pumped into the wet oxidation tower, about 190 ℃ of high temperature, under the condition of high pressure 2.5MPa, remove wherein most mercaptan and phenols, make COD reduce to 20,000-50,000 mg/L, send into sequence bioreactor SBR again and carry out a biological disposal upon.The COD of SBR water outlet is approximately 800-1000mg/L, it is pumped into the high-concentration sewage processing unit further handles.The dilution water of SBR is from two strands of water: 1, high density BAF handles the water of back qualified discharge; 2, the water of qualified discharge after the sewage of low concentration biochemical treatment.
The advantage applies of this technical process is: 1, that COD content is high alkaline residue carries out individual curing, has avoided the impact to biological treatment system, meets the thought that the dirty dirt of current water treatment is divided and ruled; 2, the consumption of fresh water has been saved in the water outlet of employing lower concentration and high density processing unit greatly as the dilution water of SBR.
The technical process of high-concentration sewage processing unit:
Electric Desalting Wastewater, stripping several combined sewages such as purify waste water are called high-concentration sewage, and the COD value is usually more than 400mg/L.It is pumped into oil trap and two-stage air flotation pool successively along pipeline, the oil-contg in the sewage is reduced to below the 30mg/L, suspension content is reduced to about 50mg/L, and water outlet is divided into three parts: a part of qualified discharge after BAF is handled; A part is used as the dilution water of SBR; A part is pumped into the sewage of low concentration processing unit.
The advantage applies of this technical process is: the water outlet of high-concentration sewage after above-mentioned art breading reaches national grade one discharge standard, dilution water as the SBR water inlet, can save the fresh water consumption on the one hand, can dilute the COD of water inlet on the other hand, because alkali cleaning water is after the wet oxidation tower is handled, COD is approximately 2-4 ten thousand mg/L, makes the processing load of SBR very big, it must be diluted the water inlet requirement that could satisfy SBR about 10-20 times.The basicity of BAF water outlet is higher, as required a part is incorporated into the sewage of low concentration processing unit, the lower concentration of reuse recirculated water can be effluxed alkalinity of water and be controlled at 80-300mg/L, can effectively utilize unnecessary basicity like this, reduce the corrodibility of water quality, and reduce the medicament expense usefulness of reusing sewage unit water stabilizer.
The technical process of sewage of low concentration processing unit:
Sewage of low concentration (COD is less than 400mg/L generally speaking) is pumped into oil trap, air flotation pool with it successively along pipeline, and handle the aeration tank, and the COD content in the sewage can be reduced to about 50mg/L, can directly enter the circulating water system use through handling again.Sewage of low concentration in this technical process has the water outlet of portion water from high density unit B AF, has so just made full use of the basicity of high density water outlet, has saved the used medicament expense usefulness of reusing sewage recirculated water, reaches goal of the invention.The part of lower concentration water outlet enters the high density unit in addition, guarantees high density water outlet qualified discharge.
Reusing sewage cell process flow process:
Portion C OD is about the lower concentration externally discharged waste water about 50mg/L, by adding water stabilizers such as biocide, corrosion inhibiting and descaling agent, make the microorganism of handling in the water of back, suspended substance etc. meet the reuse requirement, and making the peculiar smell in the sewage obtain more thoroughly removing, the externally discharged waste water after the processing directly enters circulating water system and uses.This be at present simple, economical, effectively make qualified discharge sewage handle the method that is back to circulating water system through appropriateness.The unitary water outlet of lower concentration is back to recirculated water under higher pH, can reduce the corrodibility of cycle water.
Claims (9)
1. sewage from oil refinery is handled and reclaiming system, form by ultrahigh concentration sewage disposal unit, high-concentration sewage processing unit, sewage of low concentration processing unit and reusing sewage unit, ultrahigh concentration sewage disposal unit comprises wet oxidation tower and sequence bioreactor in order, the high-concentration sewage processing unit comprises oil trap, air flotation pool and BAF in order, and the sewage of low concentration processing unit comprises oil trap, air flotation pool and aeration tank in order; Wherein, the unitary water outlet pipeline of ultrahigh concentration sewage disposal is communicated with the back with water inlet line of high-concentration sewage processing unit; The water outlet pipeline of high-concentration sewage processing unit has three strands, and one leads to sewage draining exit, and one links to each other with the back with water inlet line of sequence bioreactor in the ultrahigh concentration sewage disposal unit, and another strand links to each other with the back with water inlet line of sewage of low concentration processing unit; The water outlet pipeline of sewage of low concentration processing unit has four strands, one leads to sewage draining exit, one is communicated with the back with water inlet line of sequence bioreactor in the ultrahigh concentration sewage disposal unit, another strand is communicated with the back with water inlet line of high-concentration sewage processing unit, and one is by reusing sewage unit communication loop water system again.
2. according to the said system of claim 1, it is characterized in that ultrahigh concentration sewage comes from liquefied gas alkali cleaning water, gasoline, kerosene and diesel caustic washing water, or its combined sewage.
3. according to the said system of claim 1, it is characterized in that high-concentration sewage comes from refinery electric desalting workshop section's sewage or stripping is purified waste water, or other organism, sulphur, phenol, sewage that ammonia-nitrogen content is high, perhaps their combined sewage.
4. according to the said system of claim 1, it is characterized in that, sewage of low concentration comes from the water-and-oil separator draining of production equipment, oil-containing condensed water, the draining of pump stuffing box, laboratory sewer or sanitary sewage, perhaps their combined sewage that heat power engineering system does not reclaim.
5. sewage from oil refinery is handled the operation method with reclaiming system, and comprising: ultrahigh concentration sewage is carried out a biological disposal upon through wet oxidation tower and sequence bioreactor, and high-concentration sewage is incorporated in water outlet into; After oil trap, air flotation pool and BAF were handled, be divided into three parts: a part of qualified discharge, a part were used as the dilution water of sequence bioreactor, and another part is incorporated sewage of low concentration into high-concentration sewage; Sewage of low concentration is after oil removal, air supporting, aeration tank are handled, and a part of effluent reuse is in circulating water system, and a part is incorporated high-concentration sewage in addition, and some is as the dilution water of sequence bioreactor, a part of again qualified discharge.
6. according to the said operation method of claim 5, it is characterized in that sewage of low concentration by filtration, sterilization with add water stabilizer and make water quality meet the reuse requirement, enters circulating water system after oil removal, air supporting, aeration tank are handled.
7. according to the said operation method of claim 5, it is characterized in that ultrahigh concentration sewage comes from liquefied gas alkali cleaning water, gasoline, kerosene and diesel caustic washing water, or its combined sewage.
8. according to the said operation method of claim 5, it is characterized in that high-concentration sewage comes from refinery electric desalting workshop section's sewage or stripping is purified waste water, or other organism, sulphur, phenol, sewage that ammonia-nitrogen content is high, perhaps their combined sewage.
9. according to the said operation method of claim 5, it is characterized in that, sewage of low concentration comes from the water-and-oil separator draining of production equipment, oil-containing condensed water, the draining of pump stuffing box, laboratory sewer or sanitary sewage, perhaps their combined sewage that heat power engineering system does not reclaim.
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101591110B (en) * | 2008-05-29 | 2011-05-18 | 中国石油化工股份有限公司 | Oil refining sewage treatment technology |
| CN101597119B (en) * | 2008-06-03 | 2011-08-03 | 新疆德蓝股份有限公司 | Integrating technology of water supplying and saving and sewage reusing technology system in petroleum and petrochemical industry |
| CN102452750B (en) * | 2010-10-15 | 2013-05-01 | 中国石油化工股份有限公司 | Method for oil refinery sewage classification control and grading treatment |
| CN102690016B (en) * | 2011-03-24 | 2013-12-25 | 中国石油化工股份有限公司 | Treatment recycle method of sewage from oil refinery |
| CN102249484B (en) * | 2011-05-17 | 2013-05-08 | 东华大学 | Shunting type dual-system sludge decrement film bioreactor and using method thereof |
| CN104045210B (en) * | 2011-10-13 | 2015-07-29 | 中国石油化工股份有限公司 | The treatment for reuse method of oil refining-Ethylene Complex unit sewage |
| CN103102926B (en) * | 2011-11-10 | 2015-09-30 | 中国石油化工股份有限公司 | A kind of crude oil electric desalting and Electric Desalting Wastewater treatment process |
| CN105330086B (en) * | 2014-06-18 | 2018-03-02 | 中国石油化工股份有限公司 | A kind of processing method of methanol-to-olefins waste water |
| CN105621811B (en) * | 2014-12-10 | 2018-05-11 | 江苏明钰环保工程有限公司 | A kind of system for petrochemical wastewater processing |
| DE102016105071A1 (en) * | 2016-03-18 | 2017-09-21 | Hochwald Foods Gmbh | Modular process and wastewater treatment system for the efficient purification of wastewater, in particular of differently polluted industrial wastewater |
| CN108558133A (en) * | 2017-11-13 | 2018-09-21 | 南通东屹高新纤维科技有限公司 | A kind of waste water treatment process and system |
| CN112979015B (en) * | 2021-04-02 | 2022-09-30 | 交通运输部天津水运工程科学研究所 | Quality-divided treatment system and treatment method for port oily water |
| CN113415919A (en) * | 2021-06-29 | 2021-09-21 | 湛江远通高新技术有限公司 | Purification treatment method for cleaning emulsified sump oil in crude oil tank |
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