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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • 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
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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...

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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

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Application Information

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IPC IPC(8): C02F9/06C02F9/14C02F9/10C01D3/14C02F103/10
CPCY02A20/131
Inventor 杨幼军张世文
Owner BOYING XIAMEN SCI & TECH
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