CN113105097A - Harmless treatment method for waste water-based mud - Google Patents

Abstract

The invention provides a harmless treatment method for waste water-based mud. The method comprises the following steps: mixing the waste water-based slurry with inorganic salt and PAM, demulsifying and tempering to form tempered slurry; carrying out solid-liquid separation on the quenched and tempered pulp to obtain filtrate and filter cakes; carrying out electrocatalysis reaction on the filtrate to obtain electrocatalysis liquid; adding a calcium-magnesium ion precipitator and a flotation agent into the liquid after electrocatalysis, and carrying out oxidative degradation to obtain a degradation liquid; filtering the degradation liquid, then adjusting the pH value of the effluent to 5-7, and adding an ion adsorbent for adsorption to obtain the treated effluent. The method treats the waste water-based mud according to the steps of conditioning, solid-liquid separation, electrocatalytic reaction, oxidative degradation, pH value adjustment and ion adsorbent adsorption, and can more fully perform harmless treatment and resource utilization on the waste water-based mud, so that the cost of oil field drilling and fracturing operation is greatly reduced.

Description

Harmless treatment method for waste water-based mud

Technical Field

The invention relates to the field of petroleum/petrochemical environmental protection, in particular to a harmless treatment method for waste water-based slurry.

Background

The petroleum enterprise is an industry with high investment, high technology, high risk and high return, generally adopts mobile operation, has dispersed production layout, staggers industrial and mining areas and farmlands, urban areas and even residential areas from transverse intersection, has unique production process technology, and has complicated and complicated production links such as underground water injection, polymer injection and oil displacement, yield increase operation and the like. The characteristics determine that the oil field has stronger pollution to stratum surface water sources in the exploration, development and construction process. Recently, all levels of oil fields put forward the construction concept of 'green oil fields', great efforts and attempts are made in the processes of exploration, development, yield increasing operation and the like, the old way of 'pollution before treatment' is abandoned, and a favorable result is obtained.

But it cannot be ignored that the damage and pollution to the stratum are greatly reduced, and meanwhile, some pollution cannot be treated after returning to the ground surface, which causes environmental hidden troubles.

The oil field environment pollution source is mainly formed in the oil gas exploration and development process. The main technological process of the system engineering includes geological survey, exploration, drilling, logging, downhole operation, oil production, oil and gas gathering, storage and transportation and auxiliary matching technological process (such as water supply, power supply, communication, drainage, etc.). In these specific development activities, the pollutants and the compositions emitted by the different processes and different development stages are different. Generally, the environmental pollutants in oil fields are mainly waste drilling fluid and waste water of drilling operation.

The waste drilling fluid mainly harms soluble salts with high pH value and high concentration and high COD substances, which influence the soil structure and inhibit and harm the growth of plants; organic matters and high molecular polymers which are not easily degraded by plants enter a food chain and accumulate in animals and plants, so that the health and life safety of human beings are harmed; if entering rivers, oceans or infiltrating strata, COD, chromaticity, suspended matters, sulfides, inorganic salts and the like of the water body can seriously exceed standards, the normal growth of aquatic organisms is influenced, and underground water is polluted; the waste drilling fluid (liquid) pool is idle for a long time, and occupies increasingly reduced arable land resources.

At present, the main treatment process of the waste water-based mud in China is solidification treatment. The concrete treatment method comprises the steps of adding a slurry curing agent into the slurry pit, fully stirring the slurry curing agent, fully mixing the slurry curing agent uniformly for reaction, airing the slurry for 10 to 20 days, curing the slurry, and then burying the slurry. The mud curing agent mainly comprises a gel breaker, a water reducing agent, cement and other components. The traditional curing treatment process catalyzes a plurality of problems, and the main problems are as follows: 1. the curing is incomplete. The problem of material loss caused by work stealing in the mud curing industry in China is serious, and the added curing agent is insufficient or not sufficiently stirred, so that the curing agent is unqualified to be treated and then is buried. 2. After solidification, the landfill occupies a large amount of land, which results in waste of land resources. The soil structure of the solidified landfill is damaged, so that the water permeability of the soil is poor, the weeds are not grown normally, and the recovery life is long. 3. When the mud contains more water, the mud can not be solidified, so that the phenomenon of sewage drainage by theft is serious.

From the trend of oil field environment management, the key to solve the pollution problem of petroleum industry for a long time is to implement an environment pollution control technology, namely, pollution prevention and control work is gradually changed to source control, total amount control and sustainable development. From the reasons of environmental pollution and the sources of wastes, the comprehensive treatment is carried out, the mutual influence of engineering and environment is solved, the toxicity and the waste amount of the wastes are reduced, the resource utilization is realized, and the pollution degree of the wastes to the environment is reduced to the minimum.

Disclosure of Invention

The invention mainly aims to provide a harmless treatment method for waste water-based mud, which aims to solve the problem that the waste water-based mud cannot be effectively treated in the prior art.

In order to achieve the above objects, according to one aspect of the present invention, there is provided a method for detoxifying waste water-based slurry, comprising the steps of: mixing the waste water-based slurry with inorganic salt and PAM, demulsifying and tempering to form tempered slurry; carrying out solid-liquid separation on the quenched and tempered pulp to obtain filtrate and filter cakes; carrying out electrocatalysis reaction on the filtrate to obtain electrocatalysis liquid; adding a calcium-magnesium ion precipitator and a flotation agent into the liquid after electrocatalysis, and carrying out oxidative degradation to obtain a degradation liquid; filtering the degradation liquid, then adjusting the pH value of the effluent to 5-7, and adding an ion adsorbent for adsorption to obtain the treated effluent.

Further, the inorganic salt is one or more of aluminum sulfate, polyaluminium chloride and polyferric sulfate, and preferably polyaluminium chloride; preferably, the dosage of the inorganic salt is 500-8000 mg/L.

Further, the PAM is anionic PAM with the molecular weight of 800-2000 ten thousand, and the adding amount of the PAM is 1-100 mg/L.

Furthermore, the electrocatalysis reaction is carried out in an electrocatalysis device, the electrocatalysis device adopts an external electric field, and the electrocatalysis reaction is carried out at the interface of an electrode and a solution, wherein the anode is a plurality of groups of lead oxide catalytic electrode plates, and the cathode is a titanium substrate.

Further, the time of the electrocatalysis reaction is 1-20 min.

Further, in the step of carrying out solid-liquid separation on the quenched and tempered pulp, a plate press filtration mode is adopted, and preferably, the pressing pressure maintaining time is 1-3 h, and the pressing pressure maintaining pressure is 1.4-2.0 MPa.

Further, the calcium-magnesium ion precipitator is a cdw-1 inorganic calcium-magnesium ion precipitator, and the addition amount of the calcium-magnesium ion precipitator is 100-4000 mg/L; preferably, the flotation agent is one or more of cationic polyacrylamide, polyacrylic acid and hydrolyzed polyacrylonitrile ammonium salt, and the addition amount of the flotation agent is 1-30 mg/L.

Further, the time of the oxidative degradation reaction is 1-40 min; preferably, the oxidative degradation reaction is carried out in a reaction device, the electrocatalytic liquid enters from the upper part of the reaction device, and the top of the reaction device is provided with a chain type slag scraping system.

Furthermore, a multi-medium filtering mode consisting of manganese sand filtering and quartz sand filtering is adopted in the process of filtering the degradation liquid.

Further, sulfuric acid is adopted for adjustment in the process of adjusting the pH value; preferably, after the step of adjusting the pH value, the added ion adsorbent is a JX-10 type calcium magnesium ion adsorbent, and the adding amount of the ion adsorbent is 10-1000 mg/L.

The method treats the waste water-based mud according to the steps of conditioning, solid-liquid separation, electrocatalytic reaction, oxidative degradation, pH value adjustment and ion adsorbent adsorption, and can more fully perform harmless treatment and resource utilization on the waste water-based mud, so that the cost of oil field drilling and fracturing operation is greatly reduced. After treatment, the water content of the filter cake is less than 20%, the COD of the leaching solution is less than 50mg/L, and the compressive strength is more than 1.6 MPa. The iron ion of the filtrate is less than 1mg/L, and the free calcium ion and magnesium ion are less than 200m/L, and the filtrate can be used for preparing drilling fluid or fracturing fluid.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic view of an apparatus used in a method for detoxifying waste water-based slurry according to an embodiment of the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As described in the background section, the prior art waste water-based muds cannot be effectively disposed of. In order to solve the problem, the invention provides a harmless treatment method of waste water-based mud, which comprises the following steps: mixing the waste water-based slurry with inorganic salt and PAM, demulsifying and tempering to form tempered slurry; carrying out solid-liquid separation on the quenched and tempered pulp to obtain filtrate and filter cakes; carrying out electrocatalysis reaction on the filtrate to obtain electrocatalysis liquid; adding a calcium-magnesium ion precipitator and a flotation agent into the liquid after electrocatalysis, and carrying out oxidative degradation to obtain a degradation liquid; filtering the degradation liquid, then adjusting the pH value of the effluent to 5-7, and adding an ion adsorbent for adsorption to obtain the treated effluent.

The electrocatalytic oxidation refers to a method for directly degrading organic matters through an anode reaction or degrading organic matters by generating an oxidizing agent such as hydroxyl radical (. OH). The electrocatalytic oxidation mechanism is mainly through the action of an electrode and a catalytic material, in an electrocatalytic system, hydroxyl (OH) generated on the surface of a working electrode is a strong oxidant with very high oxidation-reduction potential (2.85V), and the oxidation-reduction potential of the strong oxidant is far higher than that of ozone (2.07V), hydrogen peroxide (1.77V), dichromate ions (1.36V) and hypochlorous acid (1.34V), so that the strong oxidation capability of the strong oxidant is realized, even organic matters which are difficult to oxidize can be completely oxidized by the strong oxidant, and the reaction speed is high. The technique employs an applied electric field, the reaction of which takes place at the electrode/solution interface. The technology is particularly suitable for treating organic matters in water which are difficult to biodegrade or difficult to effect by common chemical oxidation.

The electrocatalytic oxidation method has the advantages that: 1) OH generated in the process can react with organic matters in the wastewater indiscriminately and directly to degrade the OH into carbon dioxide, water and simple organic matters, so that no or little secondary pollution is generated; 2) the energy efficiency is high, and the method can be carried out at normal temperature and normal pressure generally; 3) the system can be independently formed into a processing system, can also be used as a pretreatment subsystem of the processing system, and can be modularly combined according to the size of the processing capacity.

The mechanism by which the metal oxide catalytic electrode (represented by MOx) removes organic contaminants (represented by R) is as follows: after electrification, the active substance on the surface of the electrode reacts with water molecules to generate an oxidizing free radical OH: MOx + H2O → MOx (OH.) + H + + e (1); a small fraction of the oxidizing radicals OH "combine with lattice oxygen in the metal oxide electrode and are converted into a more oxidizing, highly oxidizing state: MOx (OH.) → MOxO. + H + + e (2); the oxidizing free radical OH contacts with pollutants to generate complete combustion reaction, the pollutants are combusted, and the metal oxide anode is reduced to restore the activity: MOx (OH) + R → MOx + MCO2+ nH2O + H + + e (3), etc. In summary, the electrocatalytic oxidation technology for treating wastewater is one of the advanced oxidation technologies, which can directly degrade or electrochemically combust pollutants and biotoxic pollutants into carbon dioxide, and can also convert the pollutants and the biotoxic pollutants into nonbiotoxic pollutants and degrade the nonbiotoxic pollutants by means of a biological method. Is an advanced process which is environment-friendly.

During the electrocatalytic oxidation, hydrogen gas separated out from the cathode during the catalytic electrolysis can form a large amount of tiny bubbles and has good air flotation separation effect, so the process is also called as electrocatalytic-air flotation process. Therefore, the invention carries out electrocatalysis reaction on the filtrate after demulsification, tempering and solid-liquid separation of the waste water-based mud. In the process, the anode reaction is used for directly catalyzing and degrading, or the anode reaction is used for generating oxidants such as hydroxyl free radical (. OH) and ozone for oxidizing and degrading, so that organic matters are broken and decomposed, toxic and harmful intermediate products are not generated, simultaneously, a large amount of ferrous ions remained in the filtrate are oxidized into ferric ions, a flocculation effect is generated for removing, and simultaneously, the electrocatalysis reaction can generate bubbles partially dissolved in water. After the electrocatalytic solution obtained after the electrocatalytic reaction is mixed with a calcium-magnesium ion precipitator and a flotation agent, further deep reaction is carried out, and oxidative degradation is carried out. Meanwhile, bubbles generated by electrocatalysis reaction are used for electric floating, so that petroleum hydrocarbon, various ion sediments and suspended matters in the sewage are lifted to the surface layer of the liquid surface, and the separation of the petroleum hydrocarbon, the various ion sediments and the suspended matters is facilitated. Then, the obtained degradation liquid is filtered, the pH value is adjusted, and the degradation liquid is adsorbed by an ion adsorbent, so that the magnesium ions in the degradation liquid can be further removed, and treated effluent is obtained. The treated effluent can be directly used for preparing mud liquid and fracturing fluid.

In conclusion, the method provided by the invention can be used for more effectively performing harmless treatment on the waste water-based mud. The method is suitable for various waste water-based muds, such as waste drilling fluid, drilling operation wastewater and the like.

In order to more effectively demulsify the waste water-based mud, in a preferred embodiment, the inorganic salt is one or more of aluminum sulfate, polyaluminum chloride, polyferric sulfate, preferably polyaluminum chloride; preferably, the dosage of the inorganic salt is 500-8000 mg/L. More preferably, the PAM is anionic PAM with the molecular weight of 800-2000 ten thousand, and the adding amount of the PAM is 1-100 mg/L. In the specific operation process, inorganic salt and PAM can be added and then stirred to carry out rapid chemical demulsification. In the specific operation process, the waste water-based mud can be pumped into the conditioning tank by using a mud pump, and inorganic salt and PAM are added into the conditioning tank to perform demulsification and conditioning.

In a preferred embodiment, the electrocatalytic reaction is performed in an electrocatalytic device, the electrocatalytic reaction is performed in an interface between an electrode and a solution (the solution is an electrolyte, and the main components of the solution include sodium ions, potassium ions, iron ions, calcium ions, magnesium ions, chloride ions, bicarbonate ions and sulfate ions), wherein the anode is a plurality of groups of lead oxide catalytic electrode plates, and the cathode is a titanium substrate. The device is used for carrying out electrocatalysis reaction, and has better organic matter degradation effect. More preferably, the time of the electrocatalytic reaction is 1-20 min.

In a preferred embodiment, in the step of performing solid-liquid separation on the quenched and tempered slurry, plate press filtration is adopted, and preferably, the pressing pressure maintaining time is 1-3 h, and the pressing pressure maintaining pressure is 1.4-2.0 MPa. In the specific operation process, the operation can be carried out; and pumping the quenched and tempered pulp into a plate-and-frame filter press by using a plunger pump for solid-liquid separation. After pressure maintaining in a plate and frame filter press, the filter cake strength reaches the standard, and the filter cake can be used for paving well site roads.

In order to further improve the precipitation rate of calcium and magnesium ions, in a preferred embodiment, the calcium and magnesium ion precipitator is a cdw-1 inorganic calcium and magnesium ion precipitator, and the addition amount of the calcium and magnesium ion precipitator is 100-4000 mg/L; preferably, the flotation agent is one or more of cationic polyacrylamide, polyacrylic acid and hydrolyzed polyacrylonitrile ammonium salt, and the addition amount of the flotation agent is 1-30 mg/L.

More preferably, the time of the oxidative degradation reaction is 1-40 min; preferably, the oxidative degradation reaction is carried out in a reaction device (also can be called a deep reactor), the electrocatalytic liquid enters from the upper part of the reaction device (so that effective lifting of bubbles is facilitated), and the top of the reaction device is provided with a chain type slag scraping system. Thus, bubbles generated by the electrocatalysis reaction are subjected to an electric floating action, and petroleum hydrocarbon, various ion sediments and suspended matters in the sewage are lifted to the surface layer of the liquid surface and then can be separated and collected through a slag scraper system at the top of the deep reaction tank.

For more complete filtration, in a preferred embodiment, the degradation liquid is filtered by a multi-medium filtration mode consisting of manganese sand filtration and quartz sand filtration. Therefore, the residual suspended matters and the residual iron ions in the water body can be more effectively removed.

In a preferred embodiment, sulfuric acid is used for adjusting the pH value; preferably, after the step of adjusting the pH value, the added ion adsorbent is a JX-10 type calcium magnesium ion adsorbent, and the adding amount of the ion adsorbent is 10-1000 mg/L. In the actual operation process, the effluent after filtering the degradation liquid can be discharged into a tempering tank, and sulfuric acid is added into the tempering tank for regulation.

The present application is described in further detail below with reference to specific examples, which should not be construed as limiting the scope of the invention as claimed.

Example 1

Treating the waste drilling mud in Yonghe block of the medium petroleum coal bed gas Yanfen branch company, wherein the indexes of the waste drilling mud are as follows: the solid content is 11.8 percent, the total hardness is 27300mg/L, the calcium ion content is 9000mg/L, the iron ion content is 221mg/L, and the magnesium ion content is 921 mg/L.

The treatment process is shown in fig. 1, and the specific process flow comprises the following steps: the waste drilling mud is pumped into a first hardening and tempering tank 10 through a mud pump, inorganic salt and PAM are added into the first hardening and tempering tank 10, the waste drilling mud is broken into gel and hardened and tempered; pumping the waste slurry after gel breaking and conditioning into a plate-and-frame filter press 20 through a plunger pump for solid-liquid separation, maintaining the pressure in the plate-and-frame filter press 20 for 1h, discharging filtrate and filter cakes, and paving a well site road after the strength of the filter cakes reaches the standard; discharging the filtrate into an electrocatalytic reaction device 30, directly catalyzing and degrading through anode reaction in the electrocatalytic reaction device 30, or generating oxidants such as hydroxyl free radicals (OH) and ozone through anode reaction to carry out oxidative degradation, breaking chains and decomposing organic matters, and not generating toxic and harmful intermediate products, and simultaneously oxidizing a large amount of ferrous ions remained in the filtrate into iron ions to generate flocculation effect to remove bubbles partially dissolved in water generated by the electrocatalytic reaction; after the electro-catalytic reaction is finished, the sewage enters the deep reaction device 40, a calcium-magnesium ion precipitator and a flotation agent are added into the deep reaction device 40, further oxidation and degradation are carried out in the deep reaction device 40, meanwhile, bubbles generated by the electro-catalytic reaction are utilized to carry out electro-flotation action, and petroleum hydrocarbon, various ion precipitates and suspended matters in the sewage are lifted to the surface layer of the liquid level and then are separated and collected through a slag scraper system at the top of the deep reaction tank; and (3) filtering the effluent by using a filtering device 50, discharging the filtered effluent into a second tempering tank 60, adding sulfuric acid into the second tempering tank 60 to adjust the pH value to 5-7, and simultaneously adding a small amount of ion adsorbent to further adsorb calcium and magnesium ions for preparing a fracturing fluid base fluid. The specific treatment process of each treatment unit in the process flow is as follows:

inorganic salt and PAM are added in the slurry gel breaking tempering process, and chemical gel breaking is carried out by stirring. The inorganic salt is polyaluminium chloride, and the dosage of the inorganic salt is 6000 mg/L; the PAM is anionic PAM with molecular weight of 2000 ten thousand, and the dosage is 15 mg/L.

The solid-liquid separation mode is plate filter pressing solid-liquid separation, the pressing pressure maintaining time is 2 hours, and the pressing pressure maintaining pressure is 1.6 MPa.

The residence time of the electrocatalytic reaction device used was 20 minutes.

The electrocatalytic reaction device adopts an external electric field, and the reaction is carried out at an electrode/solution interface. The anode is a plurality of groups of lead oxide catalytic electrode plates, and the cathode is a titanium substrate.

The reaction time of the deep reaction device is 35 minutes. The added calcium-magnesium ion precipitator is cdw-1 inorganic calcium-magnesium ion precipitator, the addition amount of the calcium-magnesium ion precipitator is 2000mg/L, the added flotation agent is cationic polyacrylamide, and the addition amount of the flotation agent is 20 mg/L.

The sewage enters the deep reaction device from the middle upper part, so that the effective lifting of bubbles is facilitated. The top of the deep reaction device is provided with a chain type slag scraping system. The petroleum hydrocarbon, sediment and suspended matters which are lifted to the surface layer by the air bubbles can be conveniently removed.

The filtering is a multi-medium filtering mode consisting of manganese sand filtering and quartz sand filtering, and residual suspended matters and residual iron ions in the water body can be effectively removed.

The water quality adjusting process adjusts the pH to 6.5, and then adds JX-10 type calcium magnesium ion adsorbent, the adding amount is 800 mg/L.

After treatment, the water content of the filter cake is 18.65%, the COD of the leaching solution is 28mg/L, and the compressive strength is 1.6 MPa. The iron ion content of the filtrate is 0.07mg/L, the aluminum ion content is 0.02mg/L, and the free calcium ion and magnesium ion content is 168 m/L. The guar gum cross-linking system fracturing fluid is prepared by the following data:

the ratio of the guar gum powder is 0.35%, after the guar gum powder is fully dissolved, the viscosity of the base solution is 21mPa.s, after the cross-linking agent is added for cross-linking, the cross-linking time is 32s, and the temperature resistance and the shear resistance are 138 mPa.s. The tongue spitting process is uninterrupted, the requirement of replacing clear water to prepare the base fluid of the guar gum crosslinking system fracturing fluid can be met, and the cost of oil field drilling and fracturing operation is greatly reduced.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A harmless treatment method for waste water-based mud is characterized by comprising the following steps:

mixing the waste water-based mud with inorganic salt and PAM, demulsifying and tempering to form tempered mud;

carrying out solid-liquid separation on the conditioned slurry to obtain a filtrate and a filter cake;

carrying out electrocatalysis reaction on the filtrate to obtain electrocatalysis liquid;

adding a calcium-magnesium ion precipitator and a flotation agent into the electro-catalyzed solution, and carrying out oxidative degradation to obtain a degradation solution;

and filtering the degradation liquid, then adjusting the pH value of the effluent to 5-7, and adding an ion adsorbent for adsorption to obtain the treated effluent.

2. The method for harmless treatment of the waste water-based mud according to claim 1, wherein the inorganic salt is one or more of aluminum sulfate, polyaluminium chloride and polyferric sulfate, preferably the polyaluminium chloride; preferably, the dosage of the inorganic salt is 500-8000 mg/L.

3. The harmless treatment method of the waste water-based mud according to claim 2, wherein the PAM is anionic PAM with the molecular weight of 800-2000 ten thousand, and the addition amount of the PAM is 1-100 mg/L.

4. The method for harmless treatment of waste water-based mud according to any one of claims 1 to 3, wherein the electrocatalytic reaction is carried out in an electrocatalytic device, the electrocatalytic reaction is carried out in the interface of an electrode and a solution by using an external electric field, wherein the anode is a plurality of groups of lead oxide catalytic electrode plates, and the cathode is a titanium substrate.

5. The harmless treatment method for the waste water-based mud according to claim 4, wherein the time of the electrocatalytic reaction is 1-20 min.

6. The method for innocent treatment of the waste water-based slurry according to any one of claims 1 to 3, wherein the step of separating the solid and liquid of the conditioned slurry is performed by plate pressure filtration, preferably the pressure maintaining time is 1 to 3 hours, and the pressure maintaining pressure is 1.4 to 2.0 MPa.

7. The harmless treatment method of the waste water-based mud according to any one of claims 1 to 3, characterized in that the calcium-magnesium ion precipitator is a cdw-1 inorganic calcium-magnesium ion precipitator, and the addition amount is 100-4000 mg/L; preferably, the flotation agent is one or more of cationic polyacrylamide, polyacrylic acid and hydrolyzed polyacrylonitrile ammonium salt, and the addition amount of the flotation agent is 1-30 mg/L.

8. The harmless treatment method for the waste water-based mud according to claim 7, wherein the time of the oxidative degradation reaction is 1-40 min; preferably, the oxidative degradation reaction is carried out in a reaction device, the electrocatalytic liquid enters from the upper part of the reaction device, and a chain type slag scraping system is arranged at the top of the reaction device.

9. The method for harmless treatment of the waste water-based mud according to any one of claims 1 to 3, wherein a multi-medium filtering mode consisting of manganese sand filtering and quartz sand filtering is adopted in the process of filtering the degradation liquid.

10. The method for innocent treatment of waste water-based mud according to any one of claims 1 to 3, wherein the pH value is adjusted by using sulfuric acid; preferably, after the step of adjusting the pH value, the added ion adsorbent is a JX-10 type calcium magnesium ion adsorbent, and the adding amount is 10-1000 mg/L.

Images