CN108840543B - Oxidation treatment system and treatment process for waste slurry - Google Patents
Oxidation treatment system and treatment process for waste slurry Download PDFInfo
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- CN108840543B CN108840543B CN201810718447.0A CN201810718447A CN108840543B CN 108840543 B CN108840543 B CN 108840543B CN 201810718447 A CN201810718447 A CN 201810718447A CN 108840543 B CN108840543 B CN 108840543B
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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
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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
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Abstract
The invention discloses an oxidation treatment system and a treatment process of waste slurry, which comprises a slurry oxidation unit, a slurry dehydration unit and a water treatment unit which are arranged in sequence, wherein the slurry oxidation unit and the water treatment unit are respectively provided with at least one, and the treatment steps comprise: 1) and (3) mud oxidation treatment: adding a first acid regulating reagent into the waste slurry to be treated to regulate the pH value of the slurry to 3-4, adding a first oxidizing reagent, and stirring and mixing for 30-90 min; 2) and (3) slurry dehydration treatment: dehydrating the slurry subjected to the oxidation treatment in the step 1); 3) water treatment: adding a second acid regulating reagent into the liquid phase generated by dehydration in the step 2), regulating the pH value of the liquid phase to 3-4, adding a second oxidizing reagent, and stirring and mixing for 30-90 min. The treatment system and the treatment process can perform single or multiple oxidation treatment on the waste drilling mud according to the difference of the concentration of organic matters in the mud, realize the harmless treatment of the mud and ensure the sustainable development of the drilling industry.
Description
Technical Field
The invention relates to a mud treatment system and a process, in particular to an oxidation treatment system and a corresponding treatment process for waste water-based drilling mud, and belongs to the field of environmental protection.
Background
The waste water-based drilling mud is used as a pollutant generated in the drilling process and has the characteristics of high COD concentration, alkalinity, high salt content and the like. If the mud is directly discharged into the environment without being treated, the soil salinization and the pollution of underground water can be caused. At present, the domestic treatment of the waste water-based drilling mud mainly comprises two modes of reduction and harmless treatment, wherein the reduction treatment is to carry out solid-liquid separation on the mud so as to reduce the amount of solid phase, and then carry out the harmless treatment on the generated water and the solid phase. The harmless treatment needs to add a large amount of curing agent, and finally leads to obvious solid phase increment, and the subsequent utilization of the solid phase after the harmless treatment has no clear direction, so the method has the problem of storing a large amount of solid phase rock debris. Therefore, there is a need in the art to develop a treatment system and process that can achieve effective treatment of waste water-based drilling mud and avoid a substantial increase in the total solids content.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides an oxidation treatment system and a treatment process of waste water-based drilling mud, and can realize harmless treatment of the mud.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an oxidation treatment system of abandonment mud, its includes mud oxidation unit, mud dehydration unit and the water treatment facilities who sets gradually, wherein, mud oxidation unit is provided with at least one, and each mud oxidation unit includes first pH reaction case and first oxidation reaction case, water treatment facilities is provided with at least one, and each water treatment facilities includes second pH reaction case and second oxidation reaction case.
It is preferable that: the number of the mud oxidation units is 1-3.
It is preferable that: the number of the water treatment units is 1-3.
It is preferable that: the slurry dehydration unit is provided with dehydration equipment, and the dehydration equipment is a centrifugal dehydrator and/or a filter-press dehydrator.
The invention also provides an oxidation treatment process of the waste slurry, which comprises the following steps:
1) and (3) mud oxidation treatment: adding a first acid regulating reagent into the waste slurry to be treated to regulate the pH value of the slurry to 3-4, adding a first oxidizing reagent, and stirring and mixing for 30-90 min;
2) and (3) slurry dehydration treatment: dehydrating the slurry subjected to the oxidation treatment in the step 1);
3) water treatment: adding a second acid regulating reagent into the liquid phase generated by dehydration in the step 2), regulating the pH value of the liquid phase to 3-4, adding a second oxidizing reagent, and stirring and mixing for 30-90 min.
Further: the first acid regulating reagent is polymeric ferric sulfate and/or polymeric aluminum sulfate; the first oxidizing agent is ferrous sulfate and hydrogen peroxide; wherein the molar ratio of the ferrous sulfate to the hydrogen peroxide is 1:0.5-1:3, and the mass ratio of the total addition of the ferrous sulfate to the hydrogen peroxide to the COD of the slurry to be treated is 1: 1.
Further: the second acid regulating reagent is polymeric ferric sulfate and/or polymeric aluminum sulfate; the second oxidizing agent is ferrous sulfate and hydrogen peroxide; wherein the molar ratio of the ferrous sulfate to the hydrogen peroxide is 1:0.5-1:3, and the mass ratio of the total addition of the ferrous sulfate to the hydrogen peroxide to the COD of the liquid phase to be treated is 1: 1.
Further: adding a polyacrylamide solution with the concentration of 0.1 wt% in the step 1), and adding quicklime after the treatment is finished so as to adjust the pH value of the reaction system to 7-9; and 3) adding a polyacrylamide solution with the concentration of 0.1 wt%, and adding quicklime after the treatment is finished so as to adjust the pH value of the reaction system to 7-9.
Further: the oxidation treatment of the slurry in the step 1) can be sequentially carried out for 1 to 3 times.
Further: the water treatment in step 3) can be carried out for 1-3 times in sequence.
The treatment system and the treatment process have the beneficial effects that the single or multiple oxidation treatment can be carried out on the drilling waste mud according to the difference of the concentration of organic matters in the mud to be treated, the pollution degree of a solid phase and a liquid phase after separation is reduced, the treatment process links are reduced, the solid phase increment is reduced, and the whole process has good flexibility, adaptability and pertinence.
Drawings
FIG. 1 shows a block flow diagram of a system for oxidation treatment of waste sludge according to the present invention.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings.
As shown in fig. 1, the oxidation treatment system for waste sludge according to the present invention includes a sludge oxidation unit, a sludge dehydration unit, and a water treatment unit, which are sequentially connected to each other through a pipe. The slurry oxidation unit comprises a first pH reaction box and a first oxidation reaction box, wherein a first acid regulating reagent is added into the first pH reaction box, and the first acid regulating reagent is polymeric ferric sulfate and/or polymeric aluminum sulfate or other similar acidic reagents; a first oxidation reagent is added into the first oxidation reaction tank, and the first oxidation reagent is ferrous sulfate and hydrogen peroxide. In particular, in the present invention, the sludge oxidation unit may be provided with at least one, preferably 1 to 3, in order to sequentially perform the multi-stage oxidation treatment on the waste sludge to be treated. In addition, according to needs, nonionic polyacrylamide with the molecular weight of preferably 200-1200 ten thousand can be added into the first oxidation reaction tank to perform flocculation precipitation on the oxidized mud. In addition, quicklime can be added into the first oxidation reaction tank to adjust the pH value of the slurry after the oxidation reaction is finished.
The slurry after being oxidized by the slurry oxidation unit enters the slurry dehydration unit through a pipeline to be dehydrated under the lifting action of the pump. The slurry dewatering unit is provided with dewatering equipment which can be at least one of the dewatering equipment commonly used in the field such as a centrifugal dewatering machine, a filter pressing dewatering machine and the like so as to carry out solid-liquid separation treatment on the oxidized slurry, a liquid phase generated by the treatment enters the water treatment unit for further treatment, and a solid phase generated by the treatment can be directly discharged up to the standard if meeting the emission requirement up to the standard. The water treatment unit comprises a second pH reaction box and a second oxidation reaction box, wherein a second acid regulating reagent is added into the second pH reaction box, and the second acid regulating reagent is polymeric ferric sulfate and/or polymeric aluminum sulfate or other similar acidic reagents; the second oxidation reaction tank is added with a second oxidation reagent which is ferrous sulfate and hydrogen peroxide, and particularly, at least one water treatment unit can be arranged in the invention, and 1-3 water treatment units are preferably arranged in sequence, so that the liquid phase generated by the slurry dehydration unit is sequentially subjected to multistage oxidation treatment until the produced water reaches the recycling or discharge standard. In addition, according to needs, nonionic polyacrylamide with the molecular weight of preferably 200-1200 ten thousand can be added into the second oxidation reaction tank to perform flocculation precipitation on the mud after the oxidation treatment. In addition, quicklime can be added into the second oxidation reaction tank to adjust the pH value of the slurry after the oxidation reaction is finished.
According to another aspect of the invention there is also provided a process for the oxidative treatment of drilling mud using a treatment system as described above, comprising the steps of:
1) and (3) mud oxidation treatment: the method comprises the steps that waste drilling mud to be treated enters a first pH reaction box of an oxidation treatment unit after being collected, and a first acid regulating reagent is added into the first pH reaction box, wherein the first acid regulating reagent is polymeric ferric sulfate and/or polymeric aluminum sulfate, and the adding amount of the first acid regulating reagent is based on the adjustment of the pH value of the mud in the first pH reaction box to 3-4; then, the drilling mud with the pH adjusted to 3-4 enters a first oxidation reaction tank to be fully stirred, mixed and reacted with a first oxidation reagent for 30-90 min; wherein the first oxidizing agent is ferrous sulfate and 30% hydrogen peroxide by mass concentration, the molar ratio of the ferrous sulfate to the hydrogen peroxide is 1:0.5-1:3, and the mass ratio of the total addition of the ferrous sulfate and the hydrogen peroxide to the COD of the slurry to be treated is 1: 1; then, according to the volume percentage of the wastewater to be treated, adding 0.1 wt% polyacrylamide solution into the slurry after oxidation reaction, wherein the polyacrylamide preferably has a molecular weight of 200-1200 ten thousand, and the adding amount is 0% -1%, and finally adding quicklime to adjust the pH value of the reaction system in the first oxidation reaction box to 7-9.
2) And (3) slurry dehydration treatment: and (3) dehydrating the slurry subjected to oxidation treatment in the step 1) by using dehydration equipment, and if the solid phase generated by the treatment meets the emission standard, directly performing emission standard or reusing the solid phase in brick making, paving and the like.
3) Water treatment: the liquid phase generated in the step 2) enters a second pH reaction box of the water treatment unit, and a second acid regulating reagent is added into the second pH reaction box, wherein the second acid regulating reagent is polymeric ferric sulfate and/or polymeric aluminum sulfate, and the addition amount of the second acid regulating reagent is based on the adjustment of the pH value of the slurry in the second pH reaction box to 3-4; then, the drilling mud with the pH adjusted to 3-4 enters a second oxidation reaction box to be fully stirred, mixed and reacted with a second oxidation reagent for 30-90 min; wherein the second oxidizing agent is ferrous sulfate and hydrogen peroxide, the molar ratio of the ferrous sulfate to the hydrogen peroxide is 1:0.5-1:3, and the mass ratio of the total addition of the ferrous sulfate and the hydrogen peroxide to the COD of the liquid phase to be treated is 1: 1; then, based on the volume percentage of the wastewater to be treated, 0.1 wt% polyacrylamide solution can be added into the slurry after the oxidation reaction, the molecular weight of the polyacrylamide is preferably 200-1200 ten thousand, the addition amount of the polyacrylamide is 0% -1%, and finally quicklime is added to adjust the pH value of the reaction system in the second oxidation reaction box to 7-9. The produced water after oxidation treatment by the water treatment unit can be directly discharged or reused for well teams and stations, and can also be reused for intermediate water in the treatment process.
In particular, in the present invention, the above-mentioned sludge oxidation treatment step may be sequentially performed for N according to the organic matter concentration of the sludge in different work areas1And secondly, performing primary oxidation treatment on the waste drilling mud to be treated, then performing secondary oxidation treatment on the drilling mud subjected to the primary oxidation treatment, and so on until the solid phase subjected to mud dehydration treatment finally meets the emission standard. Further, in the present invention, 1. ltoreq.N from the viewpoint of processing cost, processing efficiency, etc1≤3。
Similar to the sludge oxidation treatment step, in the present invention, the water treatment step may be performed by N in sequence2Secondly, after the liquid phase of the water produced by dehydration in the step 2) is subjected to primary oxidation treatment, the liquid phase after the primary oxidation treatment is subjected to secondary oxidation treatment, and the likeUntil the produced water meets the discharge or recycling requirements of the standard. Further, in the present invention, 1. ltoreq.N from the viewpoint of processing cost, processing efficiency, etc2≤3。
Example 1
By adopting the oxidation treatment system and the treatment process, the mud of the polysulfonate system of a certain well site in Xinjiang is treated, and the total treatment amount of the mud of the polysulfonate system is 1000m3The specific gravity of the slurry is 1.3g/cm3. The two sludge oxidation units and the two water treatment units are respectively arranged, namely, the two sludge oxidation units and the two water treatment units adopt a secondary oxidation treatment step, and the treatment process comprises the following steps:
1) and (3) mud oxidation treatment: wherein: the primary oxidation treatment process of the slurry comprises the following steps: adding 3.5t polyaluminium sulfate to the waste drilling mud to be treated to adjust the pH value of the mud to 3-4; subsequently, 30t of ferrous sulphate and 33m were added to the slurry3Hydrogen peroxide with the mass concentration of 30 percent is fully mixed and oxidized for 40min, 0.01t of 0.1wt percent polyacrylamide solution with the molecular weight of 1000 ten thousand is added, and 3.0t of quicklime is added to adjust the pH value of a reaction system to 7-9 for secondary oxidation treatment of slurry; the addition amount of each reagent in the secondary oxidation treatment process of the slurry is as follows: 3.5t of polyaluminium sulfate, 30t of ferrous sulfate and 16m of hydrogen peroxide (30wt percent)33.0t of quicklime, 0.01t of polyacrylamide (with a molecular weight of 1000 ten thousand) and 40min of oxidation time, and the treatment process is the same as the primary oxidation treatment process of the slurry.
2) And (3) slurry dehydration treatment: and (3) dehydrating the slurry subjected to oxidation treatment in the step 1) by using dehydration equipment, and if the solid phase generated by the treatment meets the emission standard, directly performing emission standard or reusing the solid phase in brick making, paving and the like.
3) Water treatment: wherein, the first-stage water treatment process comprises the following steps: adding 2.1t of polyaluminium sulfate to the liquid phase generated by the dehydration in the step 2) to adjust the pH value of the liquid phase to 3-4; subsequently, 18t of ferrous sulfate and 20m were added to the liquid phase3Hydrogen peroxide with mass concentration of 30 percent is fully mixed and oxidized for 30min, 0.01t of 0.1 weight percent polyacrylamide solution with molecular weight of 800 ten thousand and 1.8t of quicklime are added to reactAdjusting the pH value of the reaction system to 7-9, and then carrying out secondary water treatment; the addition amount of each reagent in the secondary water treatment process is as follows: 1.75t of polyaluminium sulfate, 15t of ferrous sulfate and 16.5m of hydrogen peroxide (30wt percent)31.5t of quicklime, 0.005t of polyacrylamide (with the molecular weight of 800 ten thousand) and 30min of reaction time, and the treatment process is the same as the primary water treatment process. The results of the treatment are shown in table 1:
TABLE 1 results of oxidation treatment of waste drilling mud
According to the treatment results in table 1, the solid phase and the produced water of the slurry treated by the slurry oxidation treatment process of the invention both meet the emission standard of Xinjiang. The solid phase and the produced water can be recycled subsequently, the requirement of environmental protection reaching the standard can be realized, the obvious advantage of quantitative treatment of the solid phase of the drill cuttings is also realized, the comprehensive utilization of resources is effectively realized, and the sustainable development of the drilling industry is ensured.
Example 2
The oxidation treatment system and the treatment process are adopted to treat the polymer system slurry of a certain well site in North China, and the total treatment amount of the polymer system slurry is 800m3The specific gravity of the slurry is 1.3g/cm3The mud oxidation unit and the water treatment unit respectively adopt a secondary oxidation treatment step and a primary oxidation treatment step, and the treatment process is as follows:
1) and (3) mud oxidation treatment: wherein: the primary oxidation treatment process of the slurry comprises the following steps: adding 2.8t of polymeric ferric sulfate into the waste drilling mud to be treated so as to adjust the pH value of the mud to 3-4; subsequently, 24t ferrous sulphate and 26m were added to the slurry3Hydrogen peroxide with the mass concentration of 30 percent is fully mixed and oxidized for 40min, 0.01t of 0.1wt percent polyacrylamide solution with the molecular weight of 500 ten thousand and 2.5t of quicklime are added to adjust the pH value of a reaction system to 7-9 and then secondary oxidation treatment of slurry is carried out; reagents in the secondary oxidation treatment process of the slurryThe addition amount of (A) is as follows: 2.8t of polymeric ferric sulfate, 24t of ferrous sulfate and 15m of hydrogen peroxide (30wt percent)31.5t of quicklime, 0.006t of polyacrylamide (molecular weight 500 ten thousand) and 30min of oxidation time, and the treatment process is the same as the primary oxidation treatment process of the slurry.
2) And (3) slurry dehydration treatment: and (3) dehydrating the slurry subjected to oxidation treatment in the step 1) by using dehydration equipment, and if the solid phase generated by the treatment meets the emission standard, directly performing emission standard or reusing the solid phase in brick making, paving and the like.
3) Water treatment: adding 1.7t of polymeric ferric sulfate into the liquid phase generated by dehydration in the step 2) to adjust the pH value of the liquid phase to 3-4; subsequently, 18t of ferrous sulfate and 15m were added to the liquid phase3Hydrogen peroxide with the mass concentration of 30 percent is fully mixed and oxidized for 30min, 0.006t of polyacrylamide solution with the concentration of 0.1wt percent and the molecular weight of 800 ten thousand is added, and 1.5t of quicklime is added to adjust the pH value of the reaction system to 7-9 and then the reaction system can reach the standard and be discharged or reused in a well team and a station. The treatment results are shown in table 2:
TABLE 2 Oxidation treatment results of waste drilling mud
From the treatment results shown in Table 2, it is understood that the solid phase and the produced water after the sludge oxidation treatment process of the present invention meet the requirements of Integrated wastewater discharge Standard (GB 8978-1996). The solid phase and the produced water can be recycled subsequently, so that the comprehensive utilization of resources is realized, and the sustainable development of the drilling industry is ensured.
The present invention has been described in detail with reference to the preferred embodiments. However, variations and additions to the embodiments will become apparent to those of ordinary skill in the art upon a reading of the foregoing description. It is the intention of the applicants that all such variations and additions fall within the scope of the claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined generally in dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the specification and relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. Well-known functions or constructions are briefly and clearly contemplated or are not described in detail.
Claims (4)
1. An oxidation treatment process of waste slurry is characterized in that: the method comprises the following steps:
1) and (3) mud oxidation treatment: adding a first acid regulating reagent into the waste slurry to be treated to regulate the pH value of the slurry to 3-4, adding a first oxidizing reagent, and stirring and mixing for 30-90 min; wherein the first acid regulating reagent is polymeric ferric sulfate and/or polymeric aluminum sulfate; the first oxidizing agent is ferrous sulfate and hydrogen peroxide; wherein the molar ratio of the ferrous sulfate to the hydrogen peroxide is 1:0.5-1:3, and the mass ratio of the total addition of the ferrous sulfate to the hydrogen peroxide to the COD of the slurry to be treated is 1: 1;
2) and (3) slurry dehydration treatment: dehydrating the slurry subjected to the oxidation treatment in the step 1);
3) water treatment: adding a second acid regulating reagent into the liquid phase generated by dehydration in the step 2), regulating the pH value of the liquid phase to 3-4, adding a second oxidizing reagent, and stirring and mixing for 30-90 min; the second acid regulating reagent is polymeric ferric sulfate and/or polymeric aluminum sulfate; the second oxidizing agent is ferrous sulfate and hydrogen peroxide; wherein the molar ratio of the ferrous sulfate to the hydrogen peroxide is 1:0.5-1:3, and the mass ratio of the total addition of the ferrous sulfate to the hydrogen peroxide to the COD of the liquid phase to be treated is 1: 1.
2. The oxidation treatment process according to claim 1, wherein: adding a polyacrylamide solution with the concentration of 0.1 wt% in the step 1), and adding quicklime after the treatment is finished so as to adjust the pH value of the reaction system to 7-9; and 3) adding a polyacrylamide solution with the concentration of 0.1 wt%, and adding quicklime after the treatment is finished so as to adjust the pH value of the reaction system to 7-9.
3. The oxidation treatment process according to claim 1 or 2, characterized in that: the oxidation treatment of the slurry in the step 1) can be sequentially carried out for 1 to 3 times.
4. The oxidation treatment process according to claim 1 or 2, characterized in that: the water treatment in step 3) can be carried out for 1-3 times in sequence.
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| CN109956648B (en) * | 2019-04-26 | 2021-10-22 | 西安石油大学 | Method for dewatering waste drilling mud based on Fenton oxidation instability and scale adsorption weighting coupling |
| CN112520886A (en) * | 2020-11-10 | 2021-03-19 | 湖南柿竹园有色金属有限责任公司 | Wastewater flocculation method based on physical properties |
| CN116283104A (en) * | 2021-04-29 | 2023-06-23 | 交通运输部天津水运工程科学研究所 | Method for comprehensively treating oil gas exploitation derived water-based slurry and construction waste |
| CN113429100A (en) * | 2021-07-02 | 2021-09-24 | 深圳星河环境股份有限公司 | Double-stage oxidation treatment process for weak-phosphorus combustible sludge under synergistic effect of ultrasonic aeration |
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