CN105174553A - Recycle device and method for oil in oil producing wastewater - Google Patents

Recycle device and method for oil in oil producing wastewater Download PDF

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Publication number
CN105174553A
CN105174553A CN201510664185.0A CN201510664185A CN105174553A CN 105174553 A CN105174553 A CN 105174553A CN 201510664185 A CN201510664185 A CN 201510664185A CN 105174553 A CN105174553 A CN 105174553A
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China
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oil
waste water
emulsion
breakdown
extraction waste
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CN201510664185.0A
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Chinese (zh)
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张世文
杨幼军
王峰
殷明彩
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Boying Xiamen Science and Technology Co Ltd
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Boying Xiamen Science and Technology Co Ltd
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Priority to CN201510664185.0A priority Critical patent/CN105174553A/en
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Abstract

The invention discloses a recycle device for oil in oil producing wastewater. The recycle device is composed of a demulsification pool, a secondary gravity oil removal device or centrifugal machine, an oil storage tank and a wastewater collection pool; the oil producing wastewater processed through gravity oil removal is connected with a water inlet of the demulsification pool through a pipeline, a water outlet of the demulsification pool is connected with an inlet of the secondary gravity oil removal device or centrifugal machine, an oil outlet of the secondary gravity oil removal device or centrifugal machine is connected with an inlet of the oil storage tank, and a wastewater outlet of the secondary gravity oil removal device or centrifugal machine is connected with an inlet of the wastewater collection pool. The invention further discloses a recycle method for the oil in the oil producing wastewater; the oil producing wastewater processed through gravity oil removal (oil recycle) is pumped into the demulsification pool through the pipeline to be demulsified, then oil-water separation is performed on the oil producing wastewater through the gravity oil removal device or centrifugal machine, and then the oil is recycled. By recycling the oil in the oil producing wastewater, resource recycling is achieved while oil producing wastewater pollution is treated, and the recycled oil is higher in purity, few in impurity and convenient to process.

Description

A kind of retrieving arrangement of oil extraction waste water PetroChina Company Limited. and method
Technical field
The present invention relates to a kind of retrieving arrangement and method of oil extraction waste water PetroChina Company Limited., particularly relate to the petroleum recovery technique of the combined treatment regulating the processes such as pH breakdown of emulsion, gravity settling separation or centrifugation, belong to environmental engineering and resource reutilization field.
Background technology
Current, China's onshore oil field substantially all adopts waterflooding mode, namely injects high pressure water to stratum and drives crude oil to make it be extracted from oil well.After water filling after a while, injecting water will be plucked out of with crude oil, and along with the development time extends, extraction crude oil water content constantly rises.That exploit out with crude oil from stratum, containing crude oil oilfield produced water (also known as " recovered water "), the topmost class waste water being oil-field development and producing in producing.Due to the difference of the geologic condition, development scheme, oil formation improvement measure, injection water quality, gathering and transportation technology etc. in each oil field, the nature difference of each oil production waste water in oil field is very large.In general, oil extraction waste water has following characteristic:
(1) oleaginousness is high, the oil usually containing 1000 ~ 2000mg/L in oil extraction waste water, have even up to 5000mg/L, comprise oil slick, dispersed oil, oil in water emulsion and dissolving oil;
(2) containing suspended solids, particle diameter is generally 1 ~ 100 μm, mainly comprises: 1. silt particle; 2. various mineral substance; 3. bacterium: sulphate reducing bacteria (SRB) 5 ~ 10 μm, saprophytic microorganism (TGB) 10 ~ 30 μm; 4. organism: the heavy oils such as gum asphalt class and paraffin.
(3) saltiness is high, and the general inorganic salt content of oil production waste water in oil field is very high, and from several thousand to several ten thousand, hundreds of thousands of mg/litre even, each oil field, even each block, oil reservoir are all different; Mainly comprise: be 1. dissolved in the inorganic salts in water.Substantially exist with the form of anions and canons, its particle diameter is all 1 × 10 -3below μm, mainly comprise Ca 2+, Mg 2+, K +, Na +, Fe 3+, Cl -, HCO 3 -, CO 3 2-deng;
(4) containing bacterium, mainly saprophytic microorganism and sulphate reducing bacteria;
(5) high temperature and high pH, the water temperature of waste water mostly is 40 ~ 80 DEG C, and the pH of waste water is 6.5 ~ 8.5;
In addition, part oil extraction waste water is also containing tensio-active agent and polymkeric substance.
Current, waste water is mainly adopted gravity settling by the method reclaiming oil from oil extraction waste water after precipitation, and reclaim after oil through gravity settling, also remaining oil is reclaimed by air supporting again.But, when adopting air supporting to reclaim oil, often need to add a certain amount of flocculation agent and coagulant aids, therefore, there is following shortcoming:
1, containing a large amount of impurity in the oil reclaimed, the processing difficulties of the later use reclaiming oil is caused;
2, a large amount of flocculation agents and coagulant aids to be consumed, cause working cost high;
3, can produce a large amount of oily sludges, the further process of mud can produce more expense.
Summary of the invention
The object of the invention is to the deficiency for existing oil extraction waste water oil recovery techniques, a kind of from oil extraction waste water, reclaim oil device and economical method are provided.
A retrieving arrangement for oil extraction waste water PetroChina Company Limited., is made up of breakdown of emulsion pond (tank), secondary gravity oil removal plant or whizzer, oil stockpile tank and wastewater collection pond; Oil extraction waste water after gravity oil-removing (recovery oil) pumps into after breakdown of emulsion pond (tank) breakdown of emulsion through pipeline and carries out oily water separation thus recovery oil through secondary gravity oil removal plant or whizzer again; Oil extraction waste water after gravity oil-removing (recovery oil) connects through the water-in of piping with breakdown of emulsion pond, breakdown of emulsion pond (tank) water outlet connects with the import of secondary gravity oil removal plant or whizzer, the oil export of secondary gravity oil removal plant or whizzer connects with petroleum storage tanks import, and the wastewater outlet of gravity oil-removing device or whizzer connects with the import in wastewater collection pond.
Described secondary gravity oil removal plant is the one in natural subsidence separate tank, sloping panel deoiling unit, kickboard oil removal plant or hydrocyclone oil removal plant.
Described also have a heat exchanger before breakdown of emulsion pond (tank) after gravity oil-removing device.
Described breakdown of emulsion pond (tank) also comprises volume pump, emulsion splitter basin, collecting hood and gas purge tank; The outlet of emulsion splitter basin connects with the import of volume pump, and metering pump outlet connects with the emulsion splitter import of breakdown of emulsion pond (tank); Collecting hood is positioned at the top of breakdown of emulsion pond (tank), is connected with purge of gas tank by pipeline.
Utilize the retrieving arrangement of above-mentioned a kind of oil extraction waste water PetroChina Company Limited. to realize the recovery method of oil, comprise the steps:
(1) breakdown of emulsion: be 50 ~ 600mg/l, COD by oil-containing be 300 ~ 7000mg/l, SS be 50 ~ 500mg/l, saltiness to be 1000 ~ 200000mg/l, pH be 6.5 ~ 8.5 oil extraction waste water add acid for adjusting pH to 2 ~ 6 breakdown of emulsion, oil and wax are separated out;
(2) petroleum recovery: by the oil extraction waste water after step (1) breakdown of emulsion through gravity settling separation or centrifugation, obtains oil and de-oiling (wax) waste water of recovery.
Acid described in step (1) breakdown of emulsion is the one of sulfuric acid, nitric acid, phosphoric acid or hydrochloric acid.
The best acid of acid described in step (1) breakdown of emulsion is sulfuric acid.
The best breakdown of emulsion condition of step (1) breakdown of emulsion waste water is added acid to regulate its pH to 3.5 ~ 5.
Petroleum recovery described in step (2) pumps in secondary gravity oil removal plant after the oil extraction waste water after gravity settling oil removing is added acid for adjusting pH to 2 ~ 6 breakdown of emulsion, be the oil on upper strata and the oil extraction waste water of lower floor through gravity settling separation, the oil on upper strata reclaims through recovery tube.
The centrifugation described in petroleum recovery of step (2) pumps in whizzer after the oil extraction waste water after gravity settling oil removing is added acid for adjusting pH to 2 ~ 6, be the oil of lower floor and the degreased wastewater on upper strata through centrifugation, the oil of lower floor reclaims through recovery tube; The centrifugal force of centrifugation is 2200 ~ 4000.
The top condition of the centrifugation described in petroleum recovery of step (2) is centrifugal force is 3200 ~ 4000.
The present invention compared with the prior art, has following outstanding advantages:
(1) by the petroleum recovery in oil extraction waste water, while process oil extraction waste water pollutes, the recycling of resource is achieved;
(2), time from recovery oil oil extraction waste water, do not add any chemical substance, production cost significantly reduces.
(3) the oil purity reclaimed from waste water is higher, impure few, is convenient to processing.
(4) produce mud few, drastically reduce the area sludge treatment cost.
(5) while recovery oil, the wax composition of recovery, creates good condition to follow-up wastewater treatment.
Accompanying drawing explanation
Fig. 1 is the retrieving arrangement structure composition schematic diagram of a kind of oil extraction waste water PetroChina Company Limited. of the present invention;
Fig. 2 is the recovery method process flow diagram of a kind of oil extraction waste water PetroChina Company Limited. of the present invention.
Embodiment
The present invention is based on the composition of oil extraction waste water, character and existing processing scheme, devise a kind of retrieving arrangement of oil extraction waste water PetroChina Company Limited., it relates to the combined treatment device regulating the processes such as the settlement separate or centrifugation of pH breakdown of emulsion, secondary gravity, thus formed a kind of can the device of efficient recovery oil extraction waste water PetroChina Company Limited., and provide basis for the process of oil extraction waste water successive depths.
With reference to Fig. 1, a kind of retrieving arrangement of oil extraction waste water PetroChina Company Limited., is made up of wastewater equalization pond 1, accident pool 2, breakdown of emulsion pond (tank) 3, secondary gravity oil removal plant or whizzer 4, oil stockpile tank 5, wastewater collection pond 6; Oil extraction waste water is collected through piping and is connected through threeway and is delivered to wastewater equalization pond 1 or accident pool 2 respectively, wastewater equalization pond 1 or accident pool 2 are connected with the water-in of breakdown of emulsion pond (tank) 3 by pipeline and valve, breakdown of emulsion pond (tank) 3 water outlet connects with the import of secondary gravity oil removal plant or whizzer 4, the oil export of secondary gravity oil removal plant or whizzer 4 connects with oil stockpile tank 5 import, and the wastewater outlet of secondary gravity oil removal plant or whizzer 4 connects with the import in wastewater collection pond 6.
Described breakdown of emulsion pond (tank) 3 also comprises volume pump 3-1, emulsion splitter basin 3-2, collecting hood 3-3 and gas purge tank 3-4; The outlet of emulsion splitter basin 3-2 connects with the import of volume pump 3-1, and the outlet of volume pump 3-1 connects with the sour import in pH regulator pond 3; Collecting hood 3-3 is positioned at the top in pH regulator pond 3, is connected with purge of gas tank 3-4 by pipeline.
Illustrate that the present invention utilizes the retrieving arrangement of oil extraction waste water PetroChina Company Limited. to reclaim the method for oil below in conjunction with Fig. 2.
embodiment 1
(1) breakdown of emulsion: to be collected in equalizing tank 1 through pipeline by oil extraction waste water and to mix in equalizing tank 1, regulating the waste water water yield, to detect its oil-containing be 50mg/L, COD be 300mg/L, SS is 50mg/L, saltiness be 1000mg/L, pH is 6.5.Oil extraction waste water through equalizing tank is pumped into breakdown of emulsion pond (tank) 3, add sulphur acid for adjusting pH to 6 breakdown of emulsion.
(2) petroleum recovery: the oil extraction waste water of step (1) breakdown of emulsion gained is pumped into secondary gravity oil removal plant 4, reclaims to obtain oil 49g/m through gravity settling separation 3with de-oiling oil extraction waste water, oil stockpile is in oil stockpile tank 5, and de-oiling oil extraction waste water is stored in wastewater collection pond 6.
Described gravity settling separation is that oil extraction waste water is put into secondary gravity oil removal plant 4, and be the oil on upper strata and the degreased wastewater of lower floor through gravity settling separation, the oil on upper strata reclaims through recovery tube.
embodiment 2
(1) breakdown of emulsion: to be collected in equalizing tank 1 through pipeline by oil extraction waste water and to mix in equalizing tank 1, regulating the waste water water yield, to detect its oil-containing be 600mg/L, COD be 7000mg/L, SS is 500mg/L, saltiness be 200000mg/L, pH is 8.5.Oil extraction waste water through equalizing tank is pumped into breakdown of emulsion pond (tank) 3, add sulphur acid for adjusting pH to 2 breakdown of emulsion.
(2) petroleum recovery: step (1) breakdown of emulsion gained oil extraction waste water is obtained oil 598g/m through whizzer Separation and Recovery 3with de-oiling oil extraction waste water, oil stockpile is in hold tank 5, and de-oiling oil extraction waste water is stored in wastewater collection pond 6.
Described centrifugation be by breakdown of emulsion after oil extraction waste water pump in whizzer 4, be the oil of lower floor and the degreased wastewater on upper strata through centrifugation, the oil of lower floor reclaims through recovery tube; The centrifugal force of centrifugation is 2200 ~ 4000.
embodiment 3
(1) breakdown of emulsion: to be collected in equalizing tank 1 through pipeline by oil extraction waste water and to mix in equalizing tank 1, regulating the waste water water yield, to detect its oil-containing be 450mg/L, COD be 610mg/L, SS is 200mg/L, saltiness be 3200mg/L, pH is 7.2.Oil extraction waste water through equalizing tank is pumped into breakdown of emulsion pond (tank) 3, add salt acid for adjusting pH to 4 breakdown of emulsion.
(2) petroleum recovery: step (1) breakdown of emulsion gained oil extraction waste water is obtained oil 448g/m through whizzer Separation and Recovery 3and degreased wastewater, oil stockpile is in oil stockpile tank 5, and de-oiling oil extraction waste water is stored in wastewater collection pond 6.
Described centrifugation pumps in whizzer 4 by the oil extraction waste water after breakdown of emulsion, and be the oil of lower floor and the degreased wastewater on upper strata through centrifugation, the oil of lower floor reclaims through recovery tube; The centrifugal force of centrifugation is 3300 ~ 3500.
embodiment 4
(1) breakdown of emulsion: be collected in equalizing tank 1 through pipeline by oil extraction waste water, and mixing in equalizing tank 1, regulates the waste water water yield, and to detect its oil-containing be 320mg/L, COD be 5400mg/L, SS is 200mg/L, saltiness be 15200mg/L, pH is 8.2.Oil extraction waste water through equalizing tank is pumped into pH regulator pond (breakdown of emulsion pond) 3, add nitre acid for adjusting pH to 4 breakdown of emulsion.
(2) petroleum recovery: step (1) breakdown of emulsion gained oil extraction waste water is obtained oil 316g/m through whizzer Separation and Recovery 3and degreased wastewater, oil stockpile is in oil stockpile tank 5, and de-oiling oil extraction waste water is stored in wastewater collection pond 6.
Described centrifugation be by breakdown of emulsion after oil extraction waste water pump in whizzer 4, be the oil of lower floor and the degreased wastewater on upper strata through centrifugation, the oil of lower floor reclaims to obtain oil 316g/m through recovery tube 3; The centrifugal force of centrifugation is 3200 ~ 4000.
embodiment 5
(1) breakdown of emulsion: to be collected in equalizing tank 1 through pipeline by oil extraction waste water and to mix in equalizing tank, regulating the waste water water yield, to detect its oil-containing be 520mg/L, COD be 650mg/L, SS is 200mg/L, saltiness be 3500mg/L, pH is 7.3.Oil extraction waste water through equalizing tank is pumped into breakdown of emulsion pond (tank) 3, add sulphur acid for adjusting pH to 4 breakdown of emulsion.
(2) petroleum recovery: pump in secondary gravity oil removal plant 4 by step (1) breakdown of emulsion gained waste water, through gravity settling separation, obtains the oil 516g/m of recovery 3and degreased wastewater, oil stockpile is in petroleum storage tank 5, and degreased wastewater is sent in wastewater collection pond 6.
embodiment 6
(1) breakdown of emulsion: be collected in equalizing tank 1 through pipeline by oil extraction waste water, and mixing in equalizing tank 1, regulates the waste water water yield, and to detect its oil-containing be 420mg/L, COD be 1400mg/L, SS is 90mg/L, saltiness be 5200mg/L, pH is 7.3.Oil extraction waste water through equalizing tank is pumped into breakdown of emulsion pond (tank) 3, add phosphorus acid for adjusting pH to 5 breakdown of emulsion.
(2) petroleum recovery: step (1) breakdown of emulsion gained oil extraction waste water is obtained oil 406g/m through whizzer Separation and Recovery 3and degreased wastewater, oil stockpile is in oil stockpile tank 5, and de-oiling oil extraction waste water is stored in wastewater collection pond 6.
Described centrifugation be by breakdown of emulsion after oil extraction waste water pump in whizzer 4, be the oil of lower floor and the degreased wastewater on upper strata through centrifugation, the oil of lower floor reclaims to obtain oil 406g/m through recovery tube 3; The centrifugal force of centrifugation is 3200 ~ 4000.
Above are only the specific embodiment of the present invention, but design concept of the present invention is not limited thereto, all changes utilizing this design the present invention to be carried out to unsubstantiality, all should belong to the behavior of invading scope.

Claims (11)

1. a retrieving arrangement for oil extraction waste water PetroChina Company Limited., is characterized in that: be made up of breakdown of emulsion pond, secondary gravity oil removal plant or whizzer, oil stockpile tank and wastewater collection pond; Oil extraction waste water after gravity oil-removing connects through the water-in of piping with breakdown of emulsion pond, breakdown of emulsion pond water outlet connects with the import of secondary gravity oil removal plant or whizzer, the oil export of secondary gravity oil removal plant or whizzer connects with petroleum storage tanks import, and the wastewater outlet of secondary gravity oil removal plant or whizzer connects with the import in wastewater collection pond.
2. the retrieving arrangement of a kind of oil extraction waste water PetroChina Company Limited. as claimed in claim 1, is characterized in that: described secondary gravity oil removal plant is the one in natural subsidence separate tank, sloping panel deoiling unit, kickboard oil removal plant or hydrocyclone oil removal plant.
3. the retrieving arrangement of a kind of oil extraction waste water PetroChina Company Limited. as claimed in claim 1, is characterized in that: describedly between secondary gravity oil removal plant and breakdown of emulsion pond, be also provided with a heat exchanger.
4. the retrieving arrangement of a kind of oil extraction waste water PetroChina Company Limited. as claimed in claim 1, is characterized in that: described breakdown of emulsion pond also comprises volume pump, emulsion splitter basin, collecting hood and gas purge tank; The outlet of emulsion splitter basin connects with the import of volume pump, and metering pump outlet connects with the emulsion splitter import in breakdown of emulsion pond; Collecting hood is positioned at the top in breakdown of emulsion pond, is connected with purge of gas tank by pipeline.
5. a recovery method for oil extraction waste water PetroChina Company Limited., is characterized in that, adopts the retrieving arrangement of oil extraction waste water PetroChina Company Limited. according to claim 1 thus realizes petroleum recovery, comprising the steps:
(1) breakdown of emulsion: be 50 ~ 600mg/l, COD by oil-containing be 300 ~ 7000mg/l, SS be 50 ~ 500mg/l, saltiness to be 1000 ~ 20000mg/l, pH be 6.5 ~ 8.5 oil extraction waste water add acid for adjusting pH to 2 ~ 6 breakdown of emulsion, oil and wax are separated out;
(2) petroleum recovery: by the oil extraction waste water after step (1) breakdown of emulsion through gravity settling separation or centrifugation, obtain oil and the degreased wastewater of recovery.
6. the recovery method of oil extraction waste water PetroChina Company Limited. as claimed in claim 5, is characterized in that: acid described in step (1) breakdown of emulsion is the one of sulfuric acid, nitric acid, phosphoric acid or hydrochloric acid.
7. the recovery method of oil extraction waste water PetroChina Company Limited. as claimed in claim 6, is characterized in that: the best acid of acid described in step (1) breakdown of emulsion is sulfuric acid.
8. the recovery method of oil extraction waste water PetroChina Company Limited. as claimed in claim 5, is characterized in that: the best breakdown of emulsion condition of step (1) breakdown of emulsion waste water is added acid to regulate its pH to 3.5 ~ 5.
9. the recovery method of oil extraction waste water PetroChina Company Limited. as claimed in claim 5, it is characterized in that: the petroleum recovery described in step (2) pumps in secondary gravity oil removal plant after the oil extraction waste water after gravity settling oil removing is added acid for adjusting pH to 2 ~ 6 breakdown of emulsion, be the oil on upper strata and the oil extraction waste water of lower floor through gravity settling separation, the oil on upper strata reclaims through recovery tube.
10. the recovery method of oil extraction waste water PetroChina Company Limited. as claimed in claim 5, it is characterized in that: the centrifugation described in petroleum recovery of step (2) pumps in whizzer after the oil extraction waste water after gravity settling oil removing is added acid for adjusting pH to 2 ~ 6, be the oil of lower floor and the degreased wastewater on upper strata through centrifugation, the oil of lower floor reclaims through recovery tube; The centrifugal force of centrifugation is 2200 ~ 4000.
The recovery method of 11. oil extraction waste water PetroChina Company Limited. as claimed in claim 10, is characterized in that: the top condition of the centrifugation described in step (2) petroleum recovery is centrifugal force is 3200 ~ 4000.
CN201510664185.0A 2015-10-13 2015-10-13 Recycle device and method for oil in oil producing wastewater Pending CN105174553A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105540900A (en) * 2016-03-03 2016-05-04 华东理工大学 Method and device for treating alkylated waste acid and recovering organic phase
CN105618439A (en) * 2016-01-31 2016-06-01 李志强 Cleaning system and cleaning construction method for crude oil pipeline
CN108408825A (en) * 2018-04-07 2018-08-17 曾清民 A kind of sewage disposal device of visible light catalytic
CN110642435A (en) * 2019-09-27 2020-01-03 北京帝力伟业科技开发有限公司 Clean treatment system and method for ASP flooding oil extraction wastewater

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103755052A (en) * 2014-01-26 2014-04-30 西安瑞蓝机电设备有限公司 Method and system for treating petroleum refining wastewater electro-desalting black liquor
CN104860444A (en) * 2015-05-27 2015-08-26 张世文 Device and method for recovering coal tar in semi-coke wastewater

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103755052A (en) * 2014-01-26 2014-04-30 西安瑞蓝机电设备有限公司 Method and system for treating petroleum refining wastewater electro-desalting black liquor
CN104860444A (en) * 2015-05-27 2015-08-26 张世文 Device and method for recovering coal tar in semi-coke wastewater

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105618439A (en) * 2016-01-31 2016-06-01 李志强 Cleaning system and cleaning construction method for crude oil pipeline
CN105540900A (en) * 2016-03-03 2016-05-04 华东理工大学 Method and device for treating alkylated waste acid and recovering organic phase
CN108408825A (en) * 2018-04-07 2018-08-17 曾清民 A kind of sewage disposal device of visible light catalytic
CN110642435A (en) * 2019-09-27 2020-01-03 北京帝力伟业科技开发有限公司 Clean treatment system and method for ASP flooding oil extraction wastewater

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