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A zero-discharge treatment process and device for oil-containing emulsion wastewater

A treatment process and zero-discharge technology, which is applied in the field of water treatment, can solve the problems affecting the advanced treatment of the demulsification process, the difficulty of zero-discharge treatment of wastewater, and the difficulty of advanced treatment, etc., to achieve easy biodegradation and oxidative degradation, improve service life, The effect of reducing difficulty

Active Publication Date: 2021-12-10
济南灵秀环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In conjunction with the above prior art, the technical problems to be solved by the present invention are: 1. Most of the synthetic surfactants in the prior art will still remain in the wastewater when they are used in the demulsification of oil field wastewater. It makes the subsequent advanced treatment difficult, making the zero discharge treatment process of wastewater difficult; 2. The existing oilfield produced water contains a large amount of inorganic salts, which will affect the demulsification process and subsequent advanced treatment

Method used

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  • A zero-discharge treatment process and device for oil-containing emulsion wastewater
  • A zero-discharge treatment process and device for oil-containing emulsion wastewater
  • A zero-discharge treatment process and device for oil-containing emulsion wastewater

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Embodiment 1

[0060] The preparation of embodiment 1 starch-based demulsifier

[0061] Step 1, modification of active groups: Use 100g of soluble starch, add 350g of water to prepare starch slurry, adjust pH to about 9-10 with NaOH, and then add 35g of sodium hypochlorite solution (active chlorine 13%) to starch slurry for oxidation Reaction, the temperature of the reaction process is 40 ° C, after the reaction time is 4 hours, sodium bisulfite is added to terminate the reaction, the product is concentrated under reduced pressure, crystallized, filtered, washed with ethanol, and dried under reduced pressure to obtain starch modified by active groups;

[0062] Step 2, grafting of adsorption groups: Mix 20g of melamine and 70g of formaldehyde, heat up to 70-75°C and reflux to dissolve melamine; take 50g of active group-modified starch and disperse it in 0.5mol / L ammonia solution 400ml, then slowly added to the melamine-formaldehyde mixture, reflux at 85-90°C for 3 hours, add HCl to make the p...

Embodiment 2

[0078] Example 2 Wastewater Treatment Process

[0079] Step 1, carrying out oil separation treatment on the oilfield produced fluid;

[0080] Step 2. Add 20g / L starch-based demulsifier and 0.2g / L polyacrylamide (PAM) as coagulant aids to the wastewater after oil separation treatment, and perform demulsification treatment. The demulsification temperature is 45°C. Milk time is 70min;

[0081] Step 3, performing the first sedimentation treatment on the wastewater after the demulsification treatment, so that the sediment is removed and the clear liquid is obtained;

[0082] Step 4, Fenton oxidation is carried out to the wastewater after the first sedimentation treatment, Fe 2+ and H 2 o 2 The concentrations are 120mg / L and 400mg / L respectively, the pH value of the system is 3-4, the reaction temperature is 55°C, and the reaction time is 90min;

[0083] Step 5, add flocculant to the wastewater after oxidation treatment for flocculation treatment, the added flocculant is obtained...

Embodiment 3

[0086] Embodiment 3 wastewater treatment process

[0087] Step 1, carrying out oil separation treatment on the oilfield produced fluid;

[0088] Step 2. Add 30g / L starch-based demulsifier and 0.3g / L polyacrylamide (PAM) as coagulant aids to the wastewater after oil separation treatment to perform demulsification treatment. The demulsification temperature is 50°C. Milking time is 90min;

[0089] Step 3, performing the first sedimentation treatment on the wastewater after the demulsification treatment, so that the sediment is removed and the clear liquid is obtained;

[0090] Step 4, Fenton oxidation is carried out to the wastewater after the first sedimentation treatment, Fe 2+ and H 2 o 2 The concentrations are 150mg / L and 450mg / L respectively, the pH value of the system is 3-4, the reaction temperature is 45°C, and the reaction time is 80min;

[0091] Step 5, add flocculant to the wastewater after oxidation treatment for flocculation treatment, the added flocculant is ob...

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Abstract

The invention relates to a zero-discharge treatment process and device for oil-containing emulsion wastewater, belonging to the technical field of water treatment. In this method, the demulsifier based on starch material is used. On the one hand, it can effectively demulsify the emulsion wastewater produced by crude oil. On the other hand, it is easy to biodegrade and oxidatively degrade. After subsequent treatment, it can reduce the subsequent The difficulty of advanced treatment has realized the purpose of zero-discharge treatment of the emulsion wastewater produced by crude oil; in the method of the present invention, the influence of the existence of inorganic salt in the emulsion produced by crude oil on the demulsification process has been taken into account. According to the modified treatment, the Al 3+ , Ca 2+ , Mg 2+ The adsorption of plasma, using the enrichment of these inorganic salt ions, improves the effect of demulsification.

Description

technical field [0001] The invention relates to a zero-discharge treatment process and device for oil-containing emulsion wastewater, belonging to the technical field of water treatment. Background technique [0002] In the early stage of oil field exploitation, the emulsifier contained in the crude oil emulsion is mainly the active component inherent in the crude oil itself. The crude oil emulsion is in a state of multi-path coarse dispersion, with poor thermochemical stability, easy separation of oil and water, and low dosage of demulsifier. On the premise of increasing production by precipitation, the oilfield has adopted various measures to increase oil production, such as downhole operations such as acidification, fracturing, and water plugging, and tertiary oil recovery operations such as polymer flooding, alkali flooding, and compound flooding. The application of these new oil recovery technologies brings a large amount of chemicals into the formation, which greatly c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/10
CPCC02F9/00C02F2103/10C02F1/40C02F2001/007C02F1/5236C02F1/56C02F1/722C02F1/725C02F1/444C02F1/441C02F2305/026C02F2301/08
Inventor 王莉林强
Owner 济南灵秀环保科技有限公司
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