CN109160714B - Gas field oily sludge conditioning and dewatering method - Google Patents
Gas field oily sludge conditioning and dewatering method Download PDFInfo
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- CN109160714B CN109160714B CN201811067633.9A CN201811067633A CN109160714B CN 109160714 B CN109160714 B CN 109160714B CN 201811067633 A CN201811067633 A CN 201811067633A CN 109160714 B CN109160714 B CN 109160714B
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- oily sludge
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- 239000010802 sludge Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000003750 conditioning effect Effects 0.000 title claims abstract description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 30
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000003756 stirring Methods 0.000 claims abstract description 12
- 239000000292 calcium oxide Substances 0.000 claims abstract description 10
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 10
- 238000003825 pressing Methods 0.000 claims abstract description 9
- 239000012286 potassium permanganate Substances 0.000 claims abstract description 8
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 3
- 239000001103 potassium chloride Substances 0.000 claims abstract description 3
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 claims description 8
- 230000018044 dehydration Effects 0.000 abstract description 6
- 238000006297 dehydration reaction Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 244000052616 bacterial pathogen Species 0.000 abstract description 4
- 241000894006 Bacteria Species 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 230000003071 parasitic effect Effects 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 230000001954 sterilising effect Effects 0.000 abstract description 2
- 238000004659 sterilization and disinfection Methods 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 239000007789 gas Substances 0.000 description 8
- 239000003345 natural gas Substances 0.000 description 5
- 239000011499 joint compound Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000001143 conditioned effect Effects 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- -1 asphaltene Substances 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000012053 oil suspension Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 150000003071 polychlorinated biphenyls Chemical group 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002455 scale inhibitor Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/04—Oxidation reduction potential [ORP]
-
- 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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for modifying and dehydrating oily sludge in a gas field, which comprises the steps of adding sylvite into the oily sludge to be treated under the conditions of normal temperature and normal pressure, and stirring for 10-20 minutes; adding quicklime, and reacting for 10-20 minutes; and adding sodium hydroxide, stirring for 10-20 minutes, and finally performing filter pressing. The method has the advantages of low cost of raw materials, easy acquisition, simple process conditions, short treatment time, stable reaction, favorable automatic treatment of a large amount of oily sludge, good conditioning effect and high sludge dehydration degree. Meanwhile, due to the adoption of potassium permanganate, the bacteria can die through strong oxidation effect on parasitic ova, pathogenic bacteria and the like in the sludge to achieve the sterilization effect, pathogenic bacteria are not easy to generate, and the environment is protected.
Description
Technical Field
The invention belongs to the technical field of environmental engineering, and particularly relates to a chemical reagent for treating oily sludge in a gas field and a conditioning method thereof.
Background
At present, about 80 million tons of oily sludge are generated in gas fields every year in China, and the oily sludge not only contains very oily substances, but also contains a large amount of poisonous, harmful and difficultly-degradable substances such as polychlorinated biphenyl, dioxin and the like. How to reasonably dispose the oily sludge and solve the problem that the outlet of a large amount of oily sludge is an important problem related to the safety of human ecological environment.
The oily sludge of the gas field is a mixture of water, oil, mud and sand generated in the processes of natural gas development, gathering and transportation and purification treatment, and is one of main pollutants in the petrochemical industry. The oily sludge contains a large amount of components such as aged crude oil, asphaltene, colloid, bacteria and the like, and also contains water treatment agents such as flocculating agents, corrosion inhibitors, scale inhibitors, bactericides and the like added in the production process of natural gas. The water and oil in the high emulsified oily sludge in the gas field are in a stable oil-in-water or water-in-oil suspension emulsified state, and form a uniform dispersion system with solid silt under the action of hydration and electric property.
The dehydration of the oily sludge is a very important link of sludge treatment, and the reduction of the water content of the sludge is a main key technology of sludge reduction treatment. The sludge normal-temperature deep dehydration technology is a treatment technology for further dehydrating the oily sludge under a simple working condition so as to meet the sludge treatment standard and requirement, and is economically and feasibly for realizing the final reduction of the sludge treatment. The method is mainly characterized in that the oily sludge is effectively broken through a conditioner to stabilize the emulsified state, so that the aim of reduction is fulfilled by using the conventional filter pressing dehydration technology.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the method for modifying and dehydrating the oily sludge in the gas field, which has the advantages of low cost, wide raw material source, no toxicity, environmental protection, simple process condition, short treatment time and high dehydration degree.
In order to solve the technical problems, the invention adopts the technical scheme that: adding potassium salt into the oily sludge to be treated under the conditions of normal temperature and normal pressure, and stirring for 10-20 minutes; adding quicklime, and reacting for 10-20 minutes; and adding sodium hydroxide, stirring for 10-20 minutes, and finally performing filter pressing by using a plate and frame filter press, wherein the pressure of a filter plate is 15-20 MPa, and the pressure of the filter pressing is 0.4-0.8 MPa.
The addition amount of the potassium salt is 0.01-0.1% of the mass of the oily sludge to be treated, preferably the addition amount of the potassium salt is 0.03-0.06% of the mass of the oily sludge to be treated, and the potassium salt is potassium permanganate.
The adding amount of the quicklime is preferably 0.1-0.3% of the mass of the oily sludge to be treated.
The addition amount of the sodium hydroxide is preferably 0.2-0.4% of the mass of the oily sludge to be treated, and the pH value is adjusted to 9-10.
The oily sludge to be treated is the oily sludge of the gas field with the water content of 85-98 percent and the oil content of 5-15 percent.
The invention adopts sylvite strong oxidant, pathogenic bacteria, organic matters and the like in the oily sludge can be oxidized and stripped on the surface of sludge particles through strong oxidation, so that the oxidation-reduction potential balance of a sludge system is changed, free water and interstitial water in the gaps of the sludge particles can be separated out from the sludge, and the purpose of sludge dehydration is achieved; the quick lime is adopted to increase the skeleton particles of the oily sludge, so that the sludge can resist pressure under high pressure; the pH value is adjusted to be neutral or alkalescent by adopting sodium hydroxide, and the stabilizing effect on the sludge is achieved.
Compared with the prior art, the invention has the advantages that:
1. the chemical conditioning agent used in the method has low cost, is easy to obtain, has small dosage and can save the sludge treatment cost for the oil-gas field. The sludge dewatering process has the advantages of simple conditions, short treatment time, stable reaction, favorable automatic treatment of a large amount of oily sludge, good conditioning effect and high sludge dewatering degree.
2. The method adopts three substances of potassium salt (potassium permanganate), quicklime and sodium hydroxide to carry out treatment in sequence, and can achieve the aims of deeply destroying the stability of the emulsion-shaped oily sludge and deeply dehydrating the sludge. Meanwhile, due to the potassium permanganate in the formula, bacteria such as parasitic ova, pathogenic bacteria and the like in the oily sludge can die through strong oxidation to achieve the sterilization effect, and the environment is protected.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention will be described in more detail below with reference to the following figures and examples, but the scope of the invention is not limited to these examples.
Example 1
The method is adopted to treat the factory oily sludge with the water content of about 90 percent output by a certain natural gas sewage treatment plant in northern Shaanxi, and the specific method is as follows:
as shown in fig. 1, under the conditions of normal temperature and normal pressure, potassium permanganate with the mass of 0.1 percent is added into the oily sludge, and the mixture is stirred and reacts for 10 minutes; adding quicklime accounting for 0.3 percent of the mass of the oily sludge, and stirring for reacting for 10 minutes; then adding sodium hydroxide with the mass of 0.3% of that of the oily sludge, adjusting the pH value to 9-10, and stirring for reaction for 10 minutes; and finally, conveying the conditioned sludge to a plate and frame filter press, and pressing for 30 minutes under the conditions that the pressure of a filter plate is 18MPa and the pressure of the filter press is 0.6MPa to obtain filter-pressed sludge cakes. The water content of the obtained mud cake is 55.8 percent and is far lower than the 75 percent standard required by a sludge treatment plant.
Example 2
The method is adopted to treat the factory oily sludge with the water content of about 90 percent output by a certain natural gas sewage treatment plant in northern Shaanxi, and the specific method is as follows:
under the conditions of normal temperature and normal pressure, potassium permanganate with the mass of 0.01 percent is added into the oily sludge, and the mixture is stirred and reacts for 10 minutes; adding quicklime accounting for 0.1 percent of the mass of the oily sludge, and stirring for reacting for 10 minutes; then adding sodium hydroxide with the mass of 0.4% of that of the oily sludge, adjusting the pH value to 9-10, and stirring for reaction for 10 minutes; and finally, conveying the conditioned sludge to a plate and frame filter press, and pressing for 30 minutes under the conditions that the pressure of a filter plate is 18MPa and the pressure of the filter press is 0.6MPa to obtain filter-pressed sludge cakes. The water content of the obtained mud cake is 55.1 percent and is far lower than the 75 percent standard required by a sludge treatment plant.
Example 3
The method is adopted to treat the factory oily sludge with the water content of about 90 percent output by a certain natural gas sewage treatment plant in northern Shaanxi, and the specific method is as follows:
under the conditions of normal temperature and normal pressure, potassium permanganate with the mass of 0.05 percent is added into the oily sludge, and the mixture is stirred and reacts for 10 minutes; adding quicklime accounting for 0.2 percent of the mass of the oily sludge, and stirring for reacting for 10 minutes; then adding sodium hydroxide with the mass of 0.2% of that of the oily sludge, adjusting the pH value to 9-10, and stirring for reaction for 10 minutes; and finally, conveying the conditioned sludge to a plate and frame filter press, and pressing for 30 minutes under the conditions that the pressure of a filter plate is 18MPa and the pressure of the filter press is 0.6MPa to obtain filter-pressed sludge cakes. The water content of the obtained mud cake is 56.2 percent and is far lower than the 75 percent standard required by a sludge treatment plant.
Claims (4)
1. A gas field oil-containing sludge conditioning and dewatering method is characterized in that: adding potassium salt into the oily sludge to be treated under the conditions of normal temperature and normal pressure, and stirring for 10-20 minutes; adding quicklime, and reacting for 10-20 minutes; adding sodium hydroxide, stirring for 10-20 minutes, and finally performing filter pressing by using a plate and frame filter press, wherein the pressure of a filter plate is 15-20 MPa, and the pressure of the filter pressing is 0.4-0.8 MPa;
the oily sludge to be treated is the oily sludge of the gas field with the water content of 85-98 percent and the oil content of 5-15 percent; the potassium salt is potassium permanganate, and the addition amount of the potassium salt is 0.01-0.1% of the mass of the oily sludge to be treated.
2. The gas field oily sludge modifying and dewatering method according to claim 1, characterized by comprising the steps of: the addition amount of the sylvite is 0.03-0.06% of the mass of the oily sludge to be treated.
3. The gas field oily sludge modifying and dewatering method according to claim 1, characterized by comprising the steps of: the adding amount of the quicklime is 0.1-0.3% of the mass of the oily sludge to be treated.
4. The gas field oily sludge modifying and dewatering method according to claim 1, characterized by comprising the steps of: the adding amount of the sodium hydroxide is 0.2-0.4% of the mass of the oily sludge to be treated, and the pH value is adjusted to 9-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811067633.9A CN109160714B (en) | 2018-09-13 | 2018-09-13 | Gas field oily sludge conditioning and dewatering method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811067633.9A CN109160714B (en) | 2018-09-13 | 2018-09-13 | Gas field oily sludge conditioning and dewatering method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109160714A CN109160714A (en) | 2019-01-08 |
| CN109160714B true CN109160714B (en) | 2021-12-14 |
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| CN201811067633.9A Expired - Fee Related CN109160714B (en) | 2018-09-13 | 2018-09-13 | Gas field oily sludge conditioning and dewatering method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102381828A (en) * | 2011-09-28 | 2012-03-21 | 宇星科技发展(深圳)有限公司 | Sludge-dewatering compound conditioning agent and application method thereof |
| CN105330123A (en) * | 2015-11-18 | 2016-02-17 | 浙江捷丰环保技术工程有限公司 | Formula for deep dehydration of sludge and operation method of formula |
| CN106698888A (en) * | 2016-12-29 | 2017-05-24 | 华中科技大学 | Method for optimizing added amount of chemical conditioner for deep dehydration of sludge |
| CN107352770A (en) * | 2017-09-18 | 2017-11-17 | 北京惠博普能源技术有限责任公司 | A kind of Sludge in Oilfields oxidant |
| JP2018122279A (en) * | 2017-02-03 | 2018-08-09 | 日鉄住金環境株式会社 | Processing method of oil-containing sludge |
-
2018
- 2018-09-13 CN CN201811067633.9A patent/CN109160714B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102381828A (en) * | 2011-09-28 | 2012-03-21 | 宇星科技发展(深圳)有限公司 | Sludge-dewatering compound conditioning agent and application method thereof |
| CN105330123A (en) * | 2015-11-18 | 2016-02-17 | 浙江捷丰环保技术工程有限公司 | Formula for deep dehydration of sludge and operation method of formula |
| CN106698888A (en) * | 2016-12-29 | 2017-05-24 | 华中科技大学 | Method for optimizing added amount of chemical conditioner for deep dehydration of sludge |
| JP2018122279A (en) * | 2017-02-03 | 2018-08-09 | 日鉄住金環境株式会社 | Processing method of oil-containing sludge |
| CN107352770A (en) * | 2017-09-18 | 2017-11-17 | 北京惠博普能源技术有限责任公司 | A kind of Sludge in Oilfields oxidant |
Non-Patent Citations (2)
| Title |
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| 基于Fenton高级氧化-骨架构建体的污泥深度脱水研究;李亚林等;《水处理技术》;20160531;第42卷(第5期);第69-71、81页 * |
| 粉煤灰和生石灰对生活污水污泥脱水影响研究;杨斌等;《环境科学与技术》;20070430;第30卷(第4期);第98-99页 * |
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