481 results about "Produced water" patented technology

The invention discloses sewage treatment equipment and method for oil field thickened oil produced water. The equipment comprises pretreatment equipment, main body equipment, dissolved gas supply equipment and a water outlet pump. Main body equipment comprises barrel equipment, and a flotation cyclone used for achieving the functions of dissolved air flotation and cyclone separation at the same time, separating out large-particle suspended solids through centrifugal force difference and achieving floating of oil drops through microbubble adsorption surfaces is sequentially arranged on the inner portion of the barrel equipment from top to bottom. The coalescence filler layer is made of oleophylic and hydrophobic core-shell structure fibers, and emulsified oil is promoted to polymerize and break emulsion through surface energy difference; and the inclined plate sedimentation device adopts an inclined tube labyrinth surrounding structure, performs deep sedimentation by utilizing a laminar flow principle, and further removes oil drops formed after coalescence.

A method to perform oil in produced water analysis allows measuring the large volume of oil in produced water reliably. In the method, a time-series and physics based machine learning model of a gas oil separation plant is generated, advisory actionable items for maintaining a crude oil quality within a pre-determined threshold are generated based on machine learning model coefficients and outputs of soft sensors, and then the advisory actionable items are presented to a user.

The invention discloses a lime coagulation and clarification treatment system and method based on intelligent dosing, and belongs to the technical field of water treatment.The system comprises an efficient softening coagulation and clarification unit and an intelligent monitoring unit, a lime milk intelligent preparation unit, an intelligent dosing control unit and a sludge dewatering unit which are connected with the efficient softening coagulation and clarification unit. The efficient softening, coagulation and clarification unit is formed by sequentially connecting a wastewater regulating tank, a first-stage rapid mixing tank, a second-stage slow flocculation and concentration tank, a tubular membrane intelligent filtering device and a produced water neutralization tank; the intelligent monitoring unit collects incoming water and produced water data and transmits the data to the intelligent dosing control unit; the intelligent lime milk preparation unit is used for preparing and adding lime milk; the intelligent dosing control unit realizes intelligent dosing; and the sludge dewatering unit is used for treating the discharged sludge and returning the sewage. Intelligent monitoring, self-adaptive control, prediction algorithm and softening coagulation clarification are realized, the problems of inaccurate dosing, large water quality fluctuation and low automation degree of a traditional system are solved, and the system is suitable for scenes such as reclaimed water deep treatment and industrial wastewater treatment.

The invention relates to the technical field of bearings, and provides an anti-impact hydrostatic bearing air supply system which comprises a first air supply subsystem and a second air supply subsystem, the first air supply subsystem comprises a first pipeline, a first check valve and a reaction mechanism, the reaction mechanism is connected with the first pipeline, and the first check valve is arranged on the first pipeline; the second gas supply subsystem is connected with the first pipeline and is used for being connected with the hydrostatic bearing; the reaction mechanism can generate chemical reaction when the hydrostatic bearing bears strong external impact, and water vapor is generated and enters the hydrostatic bearing. According to the anti-impact air supply system for the hydrostatic bearing, when the hydrostatic bearing bears severe impact, chemical reaction occurs in the reaction mechanism, a large amount of high-temperature and high-pressure water vapor is generated, the water vapor pushes the first check valve to be opened so as to enter the hydrostatic bearing, the bearing capacity of the hydrostatic bearing is improved, and collision between the rotor and the hydrostatic bearing is avoided.

The invention discloses an all-working-condition air water production unit, which belongs to the technical field of air water production, and comprises a high-humidity air inlet channel, a low-humidity air inlet channel, a channel switching device and a water production channel, and the high-humidity air inlet channel and the low-humidity air inlet channel are both communicated with the water production channel; air flowing out of the high-humidity air inlet channel or the low-humidity air inlet channel enters the water production channel so that the water production channel can produce water. According to the invention, the high-humidity operation mode or the low-humidity operation mode is automatically switched according to the air inlet humidity. A traditional unit can only operate under a single working condition. According to the invention, the optimal energy efficiency and water production rate can be kept in different environments.

The utility model provides a process system for recycling electroplating comprehensive wastewater, which relates to the technical field of wastewater treatment and is characterized in that a liquid inlet of a primary electrodeionization device is communicated with a primary wastewater treatment unit, and a fresh water outlet of the primary electrodeionization device is communicated with a secondary wastewater treatment unit; a concentrated water outlet of the first-stage electrodeionization device is communicated with the second-stage electrodeionization device; a fresh water outlet of the secondary electrodeionization device is communicated with the primary electrodeionization treatment device, and a concentrated water outlet of the secondary electrodeionization device is communicated with the solid-liquid separation device; a liquid outlet of the solid-liquid separation device is communicated with the evaporation device; the evaporation device comprises a condensed water outlet and a byproduct salt outlet, and the condensed water outlet is communicated with the secondary wastewater treatment unit; a produced water outlet of the secondary wastewater treatment unit is communicated with the produced water collecting tank; a waste liquid outlet of the second-stage wastewater treatment unit is communicated with a second-stage electrodeionization device, so that pollutants such as heavy metal ions and organic matters in wastewater can be removed, and cyclic utilization of water resources and recovery of salt resources are realized.

The utility model discloses a central water treatment filtering device for desalted water production. A raw water inlet pipe of a reservoir is communicated with a water inlet pipeline of each filter; the ultrafiltration processors are connected in series; a water outlet of each filter is communicated with a water inlet pipeline of the first-stage ultrafiltration treater; a water outlet of the N-stage ultrafiltration treater is communicated with a water inlet pipeline of the filtered water storage tank; a water outlet of the filtered water storage tank is communicated with a water inlet pipeline of the primary reverse osmosis processor; all stages of reverse osmosis processors are connected in series, and water outlets of the N stages of reverse osmosis processors are communicated with a demineralized water storage tank pipeline. According to the device, the content of various pollutants in water entering the ultrafilter can be reduced, a filter element for ultrafiltration and reverse osmosis can be protected, the content of various impurity ions in the water after ultrafiltration is reduced, the conductivity of produced water is about 10 us / cm, the hardness is 0.01 mol / L or below, the produced water is used for supplementing water for a steelmaking and steel rolling heating furnace, and generated steam can be used for power generation of a steam turbine. Water consumption is reduced, resources are saved, and the accumulation speed of scale in the boiler is effectively reduced.

The invention discloses a method and system for producing regenerated activated carbon based on carbonized material activation heat supply coupling, and relates to the technical field of activated carbon. Comprising the following steps: adding dried waste activated carbon and a preheated carbonized material into a vertical multi-section activation furnace to obtain an activated product; the tail gas of the vertical multi-section activation furnace is combusted and fed into a waste heat boiler to produce water vapor; heating is stopped after the vertical multi-section activation furnace is heated to the activation temperature, and then activation self-sustaining heat balance is formed by means of the following heat sources: combustion heat release of volatile matter in a carbonized material, combustion heat release of H2 / CO generated by water vapor activation reaction, oxidation combustion heat supply of waste activated carbon adsorbate and combustion heat supply of non-condensable combustible gas generated by dehydration of waste activated carbon dry waste gas; the carbonized material and the waste activated carbon enter the same activation furnace device in a synergistic compatibility manner, the carbonized material and the waste activated carbon interact with each other, the activation effect is improved, and the vertical multi-section activation furnace can realize self-sustaining heat balance, so that the energy cost is greatly reduced.

The application provides an oilfield produced water treatment method. The method comprises the following steps: adding a polymeric aluminum ferric silicate solution into oilfield produced water to be treated, and stirring for a period of time at a first rotating speed; increasing the first rotating speed to a second rotating speed, adding a polyacrylamide solution, stirring for a period of time at the second rotating speed after the addition is completed, and then standing for a period of time; and filtering to obtain treated oilfield produced water. The method has the advantages of simplicity, high efficiency, low cost, easy operation, remarkable treatment effect and the like.

The invention discloses a composite electric field catalytic oxidation synergistic oil and gas field produced water treatment method which comprises the following steps: acquiring an electric flocculation effect generated by a corrosion-resistant titanium-based coating anode and a stainless steel cathode under optimized pulsed electric field parameters through a turbidity sensor and a particle size analyzer, and superposing low-frequency pulses in a composite pulse mode, maintaining the temperature of the reactor to be 20-40 DEG C in combination with a temperature control system to obtain initial floc particle size distribution and concentration data; the concentration state of the floc in the concentration tank is monitored by adopting a conductivity sensor according to the amount of the floc in the concentration tank treatment pollution discharge scheduling scheme, the content of remaining oil drops and suspended solids is analyzed in combination with an emulsion monitoring module, and the water quality parameter change of the concentration tank is recorded through a data analysis system, so that a final water quality treatment result is determined.

This invention discloses a high-efficiency integrated treatment system for produced water from oilfields, comprising an oily wastewater settling filter and an oily wastewater filter coalescer connected in sequence. The oily wastewater settling filter includes a filter tank, a settling separation mechanism, and a paper tape filter mechanism. The settling separation mechanism is located in the upper part of the filter tank, and the paper tape filter mechanism is installed on the filter tank. The oily wastewater filter coalescer includes a shell and a filter coalescing cartridge assembly. The shell includes a cartridge installation section, an inlet distribution section, and a flotation separation section. The technical solution of this invention uses the oily wastewater settling filter as a pre-treatment device and the oily wastewater filter coalescer as a post-treatment device. The organic combination of the two improves the system's effectiveness (good effluent quality indicators and stable performance) while also enhancing its economy (low construction cost and low operating cost) and environmental performance (low energy consumption and low generation of secondary oily waste).

The invention discloses a membrane contactor-membrane distillation device and method for shale gas produced water treatment, and relates to the technical field of water treatment and resource recovery, the membrane contactor-membrane distillation device comprises a membrane contactor system and a membrane distillation system, and the membrane distillation system and the membrane contactor system are connected through a first water outlet tank; the membrane contactor system comprises a water inlet tank, a membrane contactor membrane assembly and a water outlet tank I, the water outlet tank I is connected with the membrane contactor membrane assembly through a water outlet pipeline, and the membrane contactor membrane assembly is connected with the water inlet tank through a water inlet pipeline; the membrane distillation system comprises a membrane distillation membrane assembly and a second water outlet tank. According to the membrane contactor-membrane distillation device and method for treating the shale gas produced water, the membrane contactor system realizes selective and efficient recovery of ammonia by adjusting the pH value of wastewater and circularly absorbing by using a phosphoric acid solution; the membrane distillation system is used for carrying out advanced treatment on the effluent of the membrane contactor after fully absorbing ammonia, and high-quality fresh water is produced under the driving of the temperature difference between heating and condensation.

The technology relates to the use of a high salinity produced water stream from a gas oil separation plant (GOSP), as a wash water stream for the desalter unit in a GOSP. The produced water stream is pretreated by a sequence of steps and subsequently desalinated by a ultra-high pressure reverse osmosis (UHP-RO) membrane. The UHP-RO produces a permeate stream and a reject stream. A portion of the permeate stream is reused as a wash water stream in the desalter unit of the GOSP.

The utility model discloses a fracturing water fine treatment device and a filter barrel thereof, the fracturing water fine treatment device comprises an outer barrel, an inner barrel is arranged in the outer barrel, the inner barrel is provided with a produced water blending device, at least two flocculation basins and at least one clean water basin are arranged between the outer barrel and the inner barrel, and each clean water basin is positioned between two adjacent flocculation basins; the inner barrel is provided with a liquid discharge pipe communicated with the flocculation basin; a first-type partition plate is arranged between every two adjacent flocculation tanks, a second-type partition plate is arranged between the clean water tank and the flocculation tanks, and the second-type partition plate is lower than the first-type partition plates. When the device is cleaned and maintained, the device can work, so that the production halt time caused by cleaning and maintenance is shortened, and the production efficiency is improved.

The utility model relates to the technical field of water collection and distribution device machining, and discloses a machining device for water collection and distribution device production, which comprises a bottom plate, two fixing plates are fixedly connected to the top side of the bottom plate, two clamping blocks are connected to the bottom side of the bottom plate through sliding assemblies, and a plurality of telescopic rods are arranged on the sides, away from each other, of the two clamping blocks. A plurality of springs are arranged on the sides, close to each other, of the two fixing plates, one ends of the springs are connected with the interiors of the telescopic rods, the other ends of the springs are connected with the sides, close to each other, of the two fixing plates, a water collecting and distributing device body is arranged on the sides, close to each other, of the two clamping blocks, and the water collecting and distributing device body is connected with the two fixing plates through a cleaning assembly. According to the utility model, the rejection rate is reduced, the production efficiency and the product quality are improved, the influence of sweeps on subsequent processing or use is avoided, the processing environment is cleaner, the interference of the sweeps on equipment and operators is reduced, and a guarantee is provided for safe production.

A process is described for synthesising hydrocarbons comprising the steps of: (a) feeding a gas mixture comprising hydrogen and carbon dioxide to a reverse water-gas shift unit to form a crude synthesis gas comprising hydrogen, carbon monoxide carbon dioxide and steam, (b) cooling the crude synthesis gas to condense water and removing water, and optionally carbon dioxide, from the crude synthesis gas to produce a feed stream comprising hydrogen and carbon monoxide, (c) passing the feed stream though a hydrocarbon synthesis unit comprising a reactor containing a Fischer-Tropsch catalyst to form a product stream comprising a mixture of liquid hydrocarbons, a co-produced water stream, and a tail gas stream containing hydrogen, carbon monoxide and gaseous hydrocarbons, and (d) upgrading the product stream in an upgrading unit to produce an upgraded product stream, wherein a naphtha stream is separated from the product stream or the upgraded product stream, at least a portion of the tail gas stream is fed with steam to a first derichment vessel containing a derichment catalyst to form a first gas mixture containing methane, at least a portion of the naphtha stream is fed with hydrogen and steam to a second derichment vessel containing a derichment catalyst to form a second gas mixture containing methane, and the first and second gas mixtures containing methane are fed to the reverse water gas shift unit. A system for performing the process is also provided.

The utility model discloses a sea water desalination treatment device which comprises a mounting frame, a first mounting position and a second mounting position are arranged on the right side of the bottom of the mounting frame, a third mounting position and a fourth mounting position are arranged on the left side of the bottom of the mounting frame, and two first supports which are arranged side by side at intervals are connected to the top of the mounting frame; the first mounting position is provided with a raw water booster pump, the second mounting position is provided with a water supply pump, the third mounting position is provided with a filter group, the fourth mounting position is provided with a plunger pump, and reverse osmosis membrane assemblies are mounted on the two first brackets; the output end of the raw water booster pump is connected with the input end of the filter set, the output end of the filter set is connected with the input end of the plunger pump, the output end of the plunger pump is connected with the input end of the reverse osmosis membrane assembly, the first output end of the reverse osmosis membrane assembly is a produced water discharge end, and the second output end of the reverse osmosis membrane assembly is a concentrated water discharge end. The input end of the water supply pump is connected with the first output end of the reverse osmosis membrane component; the output end of the water supply pump is a produced water conveying end; and the structural layout is more reasonable, so that subsequent maintenance operation is facilitated.

The invention relates to the technical field of bearings, and provides a hydrostatic bearing gas supply system capable of continuously supplying gas, the hydrostatic bearing gas supply system comprises a first gas supply subsystem and a second gas supply subsystem, the first gas supply subsystem comprises a first pipeline, a first valve, a first reaction mechanism, a second reaction mechanism and a degassing structure, the first reaction mechanism is internally provided with a reactant, and the second reaction mechanism is internally provided with a second pipeline; the first valve and the degassing structure are arranged on the first pipeline; the second gas supply subsystem is connected with the first gas supply subsystem; the first valve is used for being opened when the second gas supply subsystem breaks down, reactants in the first reaction mechanism enter the second reaction mechanism to be subjected to chemical reaction, water vapor and oxygen are generated, and the degassing structure is used for consuming oxygen and generating superheated steam. According to the hydrostatic bearing gas supply system capable of continuously supplying gas, high-temperature and high-pressure water vapor and oxygen are generated through chemical reaction, the oxygen is consumed through the degassing structure, a pure water vapor working medium is provided for the hydrostatic bearing, and normal operation of the hydrostatic bearing is guaranteed.

This invention relates to the field of industrial wastewater technology, and discloses a resource recovery and zero-discharge treatment process and system for coal gasification wastewater. The resource recovery and zero-discharge treatment process for coal gasification wastewater provided by this invention achieves zero discharge and resource recovery after treatment, with the produced water fully meeting reuse requirements. No wastewater enters conventional downstream advanced treatment and zero-discharge systems. Simultaneously, the salt content in the wastewater is utilized to produce high-value products for sale. The system is not affected by the temperature and quality of the coal gasification wastewater, thus completely solving the shortcomings of conventional biological methods for treating coal gasification wastewater.

The application relates to the field of water treatment, in particular to a one-active-one-standby water treatment control system alternating use control method which comprises a first water treatment device for softening hard water and a second water treatment device for softening hard water and alternating with the first water treatment device. The first water treatment device and the second water treatment device of the application alternately produce water, form uninterrupted supply of softened water, one water treatment device produces water, and the other water treatment device is standby, can continuously supply softened water to a water area, and cannot appear the phenomenon that the water production is stopped during regeneration, is automatically controlled, and is convenient to use.

The invention provides a coastal oilfield produced water conveying pipeline safety risk evaluation method and system, and the system comprises an online monitoring system which is used for obtaining pipeline parameters, and calculating a pipeline safety risk index R according to the pipeline parameters; d is the pipeline damage probability, and ML is the maximum leakage quality; the larger the pipeline safety risk index R is, the higher the pipeline risk is. The online monitoring system is used for collecting operation data of the pipeline, risk calculation and judgment are carried out in combination with pipeline design and operation parameters, an equipment risk sequence is obtained and used for guiding formulation of an inspection plan, and the method has the advantages of being good in real-time performance, high in efficiency and feasible in field calculation.

The utility model discloses an experimental device for evaluating the influence of oil well production pressure difference on the stability of oil-water emulsion, which is characterized in that an outlet of a produced water temperature-resistant and pressure-resistant container is connected with an inlet of a trace water injection pump, and an outlet of a produced oil temperature-resistant and pressure-resistant container is connected with an inlet of a trace oil injection pump; outlets of the micro water injection pump and the micro oil injection pump are respectively connected with two inlets of the three-way valve, an outlet of the three-way valve is connected with a liquid phase inlet of the high-pressure emulsification tank, and a liquid outlet of the high-pressure emulsification tank is connected with an inlet of the storage type temperature-resistant and pressure-resistant container; an outlet of the storage type temperature-resistant and pressure-resistant container is connected with an oil pipe inlet of the small-sized double-wing well head device through a one-way pressure regulating valve, an oil nozzle sleeve outlet of the small-sized double-wing well head device is connected with a short pipe, and an outlet of the short pipe is inserted into a center hole of a large-end end cover of the transparent receiving cover. The side wall of the transparent receiving cover is provided with a transparent observation window and a high-speed camera. The device can simulate various working conditions in actual production, provides an emulsion stability evaluation report, and is beneficial to optimization of an oil field production process.

This utility model discloses a hot and cold circulating water supply mechanism and device, relating to the field of hot and cold circulating water supply mechanisms and devices. It includes a mounting frame, with a hot water storage tank fixedly connected to the front of the mounting frame, and a cold water storage tank fixedly connected to the front of the mounting frame. A refrigeration unit is fixedly connected to the bottom of the cold water storage tank. Both the hot water storage tank and the refrigeration unit are equipped with a mixing temperature control mechanism at their bottoms. Through this mixing temperature control mechanism, a linear regulating valve precisely controls the mixing ratio of hot and cold water, causing the mixed water to impact the turbine blades under gravity, generating vortices and ensuring thorough mixing within the mixing tank. Temperature sensors feed back data to the control panel for closed-loop control, directly producing water at an intermediate temperature. This avoids the energy waste of secondary heating of cold water or secondary cooling of hot water, reducing energy consumption and further avoiding frequent start-ups and shutdowns of the refrigeration unit and heating elements, thus extending equipment lifespan.

The invention particularly relates to a novel self-power-generation system and method for an offshore unmanned platform. According to the system, ORC power generation is conducted through waste heat resources generated when the offshore unmanned platform produces water and crude oil, electric power generated by the ORC power generation system is adjusted and used through the load adjusting control system, the electric power is supplied to the offshore unmanned platform, and fluctuation of a power grid is prevented. Self power generation of the offshore unmanned platform can be achieved, the isolated network problem is solved, meanwhile, ORC power generation is used for replacing a turbine generator set, fossil fuel and operation and maintenance cost are saved, the economical efficiency of the offshore unmanned platform is improved, and the method can be widely applied to the field of industrial waste heat utilization.

The invention discloses a reclaimed water stage treatment system and a non-ferrous smelting dual water supply system. The reclaimed water stage treatment system comprises an adjusting device, a primary treatment device and a secondary treatment device, the adjusting device is used for receiving reclaimed water, the primary treatment device comprises a physicochemical reaction unit and a first filtering unit, and the physicochemical reaction unit is used for removing heavy metals in the reclaimed water and adjusting the hardness of water; the first filtering unit is used for filtering impurities in the recycled water to obtain clear liquid, and part of the clear liquid generated by the first filtering unit is used for providing first produced water; the secondary treatment device is connected with the first filtering unit, the secondary treatment device is used for purifying residual clear liquid flowing out of the first filtering unit, purified water discharged by the secondary treatment device is used for providing second produced water, and concentrated water discharged by the secondary treatment device is used for providing third produced water. According to the invention, the reclaimed water can be subjected to stage treatment to obtain produced water with different water qualities, so that the process flow is optimized, and the economic benefit and the environmental benefit are improved.

The present application belongs to the technical field of oil and gas field produced water treatment, and particularly relates to an ammonia nitrogen treatment system and method for oil field sulfur-containing produced water. The method comprises the following steps: sending the oil field sulfur-containing produced water into a first buffer pool, reducing sulfides through two-stage aeration of a cyclone aerator and an aeration nozzle device, overflowing from the first buffer pool to a second buffer pool when the first buffer pool reaches a water outlet height, and removing ammonia nitrogen by adding an ammonia nitrogen remover through a conventional dosing port of a dosing device. The present application fully utilizes the characteristics of aeration sulfur removal, and through the addition of a targeted chemical agent and the control of key parameters, purifies and softens the oil field sulfur-containing produced water in one step. After treatment, the water quality only needs to be further filtered by two stages of fine filtration, and the outlet water quality directly meets the steam boiler feed water requirements.

The application discloses a filtering method based on a circulating water path, which is applied to a filtering system, and the filtering system comprises a raw water branch, a booster device, a water production branch, a waste water discharge branch, a pure water discharge branch, a pure water return branch and a preposition device. When it is judged that the water production branch meets a flushing condition, the filtering system is controlled to perform a flushing operation, and the flushing operation comprises first stage flushing and / or second stage flushing. When it is judged that the water production branch meets a water production condition, the filtering system is controlled to perform first stage water production and second stage water production. It can be seen that the application can provide a multi-stage flushing and water production control mechanism to effectively flush and produce water for the filtering system, significantly improve the intelligent control level of the filtering system, improve the flushing efficiency of the filter core, improve the water production rate of the filtering system, improve the quality of the first cup of water, and avoid waste of water resources.

The utility model discloses a biochemical treatment device for MVR (mechanical vapor recompression) distilled water in high-salt gas field produced water, which comprises a treatment shell, an aeration pipe used for aeration in the treatment shell is mounted in the treatment shell, a rotatable dispersing disc is further arranged in the treatment shell, and the dispersing disc is provided with a water inlet and a water outlet. A plurality of dispersing inclined blocks arranged at equal intervals are arranged at the top of the dispersing disc, a mounting seat is fixedly connected to the side face of the treatment shell, a servo motor is fixedly connected to the mounting seat, a driving wheel is fixedly connected to an output shaft of the servo motor, a driving rod is fixedly connected to the center of the bottom of the dispersing disc, and a driving wheel is fixedly connected to the driving wheel. The bottom of the driving rod is fixedly connected with a driven wheel used in cooperation with the driving wheel. According to the utility model, in the biochemical agent feeding process, the biochemical agent can be dispersed and fed through the dispersing disc, so that the mixing efficiency of the biochemical agent and sewage is improved, and the sewage treatment efficiency is improved.

The application discloses a tail water grading purification system for arid saline-alkali farmland, and discloses a purification method thereof, and belongs to the technical field of energy saving and emission reduction. Through the tail water detection system, the preliminary purification treatment system and the deep purification treatment system, and the purification treatment system comprising multiple water purification modules, multi-stage purification of the tail water of the farmland is realized. The whole system comprises three-stage detection, a special toxic detection module is arranged, the safety of the produced water is ensured, the recycling of the inorganic salt in the preparation process is realized, the whole process is controlled and decided through the central control system, the operation cost is reduced, the system is economic and practical, energy-saving and environment-friendly, and the problem that the tail water of the farmland is complex in composition, contains a large amount of inorganic salt, heavy metal ions and organic matter and is difficult to treat is solved.

The application provides an oil and gas field waste liquid classification gradient treatment method. The method comprises the following steps: performing electro-oxidation treatment on produced water to obtain electro-oxidation treated produced water; performing adsorption treatment on part of the electro-oxidation treated produced water by using an adsorption material to capture active chlorine, so as to obtain the adsorption material for capturing active chlorine and the adsorption treated produced water; performing biological treatment on the adsorption treated produced water to obtain treated produced water; mixing the other part of the electro-oxidation treated produced water with operation waste liquid, adding the adsorption material for capturing active chlorine, and obtaining gel breaking and de-stabilizing treated operation waste liquid; and performing coagulation and flocculation separation and ion control on the gel breaking and de-stabilizing treated operation waste liquid to obtain treated operation waste liquid. The method is suitable for large platform production mode of oil and gas field development, and can perform classification gradient treatment on produced water and operation waste liquid produced and discharged from platforms in the same region or adjacent regions, so that the treatment cost is reduced.