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Combined membrane technology-based high temperature high-salt petroleum production wastewater recycling method

A technology for high-temperature, high-salt, oil extraction wastewater, applied in mining wastewater treatment, chemical instruments and methods, water/sewage treatment, etc.

Active Publication Date: 2017-06-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problems of wide pollution range, great harm and difficult degradation treatment of oil production wastewater, and to provide a method for recycling and reusing high-temperature and high-salt oil production wastewater based on combined membrane technology

Method used

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  • Combined membrane technology-based high temperature high-salt petroleum production wastewater recycling method

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specific Embodiment approach 1

[0016] Specific implementation mode 1: In this implementation mode, the method for recycling and reusing high-temperature and high-salt oil production wastewater based on the combined membrane process is carried out according to the following steps:

[0017] 1. After being pressurized by the pressurization equipment 1, the wastewater from oil production enters the ceramic ultrafiltration membrane module 2 under the condition of a pressure of 0.05MPa-0.3MPa, and the filtered water enters the sump 3, reaching 50-70% of the volume of the sump. The ultrafiltration system is stopped, the oil in the filter cake layer is recovered, and the ceramic ultrafiltration membrane module 2 is cleaned;

[0018] 2. When the ultrafiltration system stops running, the forward osmosis and membrane distillation systems start to run, and the filtered water in the sump 3 enters the raw material liquid side 5-1 of the membrane distillation assembly 5 through the first water pump 4-1, and is cooled The ...

specific Embodiment approach 2

[0022] Embodiment 2: This embodiment differs from Embodiment 1 in that the ceramic ultrafiltration membrane module 2 in step 1 has a pore size of 5KDa-0.1 μm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0023] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the material of the ceramic ultrafiltration membrane module 2 in step 1 is alumina, titania or zirconia. Others are the same as those in the first or second embodiment.

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Abstract

The invention relates to a petroleum production wastewater recycling method, and concretely relates to a combined membrane technology-based high temperature high-salt petroleum production wastewater recycling method. The method is used for solving the technical problems of wide pollution range, large harms and difficult degradation of petroleum production wastewater. The method comprises the following steps: 1, an ultrafiltration system runs; 2, a forward osmosis and membrane distillation system starts to run; 3, water discharged from a raw material liquid side enters the liquid drawing side of a forward osmosis assembly, and a hypoosmotic solution to be concentrated in a forward osmosis raw material liquid tank enters the raw material liquid side of the forward osmosis assembly through a third water pump and undergoes concentration circulation; 4, when the temperature of filtered water is 30-35 DEG C, the forward osmosis and membrane distillation system stops running, a water collecting tank, a membrane distillation assembly and the forward osmosis assembly are emptied, and petroleum undergoes groundwater recharge; and 5, after the water collecting tank is emptied, the membrane distillation assembly and the forward osmosis assembly are cleaned, step 1 is repeated, and step 2 to step 4 are simultaneously repeated to complete the system. Petroleum, high heat and high salt in the petroleum production wastewater are respectively used in the invention.

Description

technical field [0001] The invention relates to a method for recovering and reusing oil production wastewater. Background technique [0002] Oily wastewater can be divided into floating oil, dispersed oil (about 90wt.%), emulsified oil (about 10wt.%) and dissolved oil (<0.5wt.%). Slack and dispersed oils are relatively easy to separate due to their larger particle size (>10 μm). The emulsified oil is relatively stable and the particle size is small (<10μm). Traditional treatment methods (such as gravity separation, coalescence separation) are difficult to remove the emulsified oil, and the water quality after treatment is difficult to meet the discharge or reinjection standards, so the oil production wastewater has a pollution range wide, harmful, difficult to degrade the characteristics of treatment. Ultrafiltration membrane technology is one of the most effective separation methods for treating oily wastewater. It does not need to add chemical reagents during t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C02F103/10
CPCC02F1/444C02F1/445C02F1/447C02F2103/10
Inventor 马军吕东伟刘乾亮
Owner HARBIN INST OF TECH
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