Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for treating and recycling high-salt oil-field wastewater

A technology of oil extraction wastewater and high salt, applied in mining wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as high cost, membrane calcification, and fouling

Inactive Publication Date: 2015-10-28
BOYING XIAMEN SCI & TECH
View PDF10 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for treating high-salt oil production wastewater and its recycling, the main purpose of which is to overcome the defects of film calcification, serious fouling and high cost in the treatment process of oil field production water film method in the prior art

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for treating and recycling high-salt oil-field wastewater
  • Method for treating and recycling high-salt oil-field wastewater
  • Method for treating and recycling high-salt oil-field wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for processing and recycling high-salt oil production wastewater includes the following steps:

[0034] 1. De-hardness

[0035] Add lime milk and sodium carbonate to the wastewater containing calcium ion 3000mg / L, magnesium ion 500mg / L, sodium ion 8000mg / L, chloride ion 10000mg / L, oil content 300mg / L, and COD 500mg / L. The coagulant and flocculant make calcium carbonate and magnesium carbonate precipitate, and the calcium carbonate and magnesium carbonate precipitate are removed by precipitation separation, so that the concentration of calcium and magnesium ions is controlled to be less than 80mg / L. Hardness removal also includes a calcium carbonate precipitation treatment process, through which calcium carbonate is heated and oxidized to decompose into oxygen calcium.

[0036] 2. Membrane filtration

[0037] After filtering and clarifying the oil production wastewater after dehardening in step 1, it is filtered through membrane to remove particulate impurities. Among...

Embodiment 2

[0043] A method for processing and recycling high-salt oil production wastewater includes the following steps:

[0044] 1. De-hardness

[0045] Add lime milk and sodium carbonate to the oil production wastewater containing 200mg / L calcium ion, 20mg / L magnesium ion, 200mg / L sodium ion, 200mg / L chloride ion, 30~300mg / L oil content and 100mg / L COD Cooperate with coagulant and flocculant to make calcium carbonate and magnesium carbonate precipitate. After precipitation separation, the calcium carbonate and magnesium carbonate precipitate are removed, so that the concentration of calcium and magnesium ions is controlled to be less than 80mg / L. Hardness removal also includes a calcium carbonate precipitation treatment process, through which calcium carbonate is heated and oxidized to decompose into oxygen calcium.

[0046] 2. Remove COD

[0047] After removing the hardness in step 1, the COD concentration in the wastewater is reduced by removing the COD process of the oil production wastew...

Embodiment 3

[0055] A method for processing and recycling high-salt oil production wastewater includes the following steps:

[0056] 1. De-hardness

[0057] Add lime milk and sodium carbonate to the oil production wastewater containing 1500mg / L of calcium ion, 250mg / L of magnesium ion, 4000mg / L of sodium ion, 5000mg / L of chloride ion, 150mg / L of oil and 250mg / L of COD. The coagulant and flocculant make calcium carbonate and magnesium carbonate precipitate, and the calcium carbonate and magnesium carbonate precipitate are removed by precipitation separation, so that the concentration of calcium and magnesium ions is controlled to be less than 80mg / L. Hardness removal also includes a calcium carbonate precipitation treatment process, through which calcium carbonate is heated and oxidized to decompose into oxygen calcium.

[0058] 2. Separation and filtration of precipitation

[0059] The oil production wastewater after de-hardening in step 1 undergoes precipitation separation and filtration steps t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Membrane pore sizeaaaaaaaaaa
Apertureaaaaaaaaaa
Membrane pore sizeaaaaaaaaaa
Login to View More

Abstract

A method for treating and recycling high-salt oil-field wastewater comprises the following steps: (1) adding lime milk and sodium carbonate into pre-treated oil-field wastewater to generate calcium carbonate precipitation and magnesium carbonate precipitation by cooperating with a coagulant and a flocculating agent, and removing the calcium carbonate precipitation and the magnesium carbonate precipitation through precipitation separation to eliminate the calcification of a membrane and avoid the blockage of the membrane; (2) after filtering and clarification, removing particle impurities through microfiltration, hyperfiltration or nanofiltration membrane filtering; (3) performing reverse osmosis, forward osmosis, electroosmosis and capacitive adsorption treatment to obtain recycled reused water and a concentrated solution. According to the method provided by the invention, CODcr can be effectively reduced, the indexes, such as SS and turbidity of wastewater can be reduced, the metal ions in water can be removed, the salt content can be lowered, and the recovery rate of 50 to 65 percent of oil-field wastewater is realized.

Description

Technical field [0001] The invention belongs to the field of water pollution control of environmental engineering, and more specifically refers to a method for processing high-salt oil extraction wastewater and its recycling utilization. Background technique [0002] The oil field produced water is mainly sewage from the crude oil production and treatment process. There are many ways to treat oilfield produced water according to the different requirements of discharge or reuse. As feed water for steam generators or boilers, it is necessary to strictly control the content of calcium ions, magnesium ions and other easily scaling ions in the water, total salinity, and water The oil content and so on. There have been many reports on the use of membrane separation technology for the desalination of produced water from oil fields, and the regeneration and recycling of produced water. The main pollutant indicators of the oil field produced water after general pretreatment to remov...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C02F9/06C02F9/14C02F9/10C01D3/14C02F103/10
CPCY02A20/131
Inventor 杨幼军张世文
Owner BOYING XIAMEN SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com