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Method of treating oil field waste water using flocculation electro multiphase catalysis and special flocculation equipment

A technology for oilfield wastewater and heterogeneous catalysis, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. The effect is not ideal enough to achieve the effect of low operating cost, easy operation and simple dosing

Inactive Publication Date: 2003-04-16
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the process of treating oilfield wastewater, when air flotation-flocculation or electro-heterogeneous catalytic reaction is used alone, the effect is often not ideal, so the discharge standard of wastewater cannot be met; or the cost is too high to be suitable for large-scale application

Method used

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  • Method of treating oil field waste water using flocculation electro multiphase catalysis and special flocculation equipment
  • Method of treating oil field waste water using flocculation electro multiphase catalysis and special flocculation equipment
  • Method of treating oil field waste water using flocculation electro multiphase catalysis and special flocculation equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Treatment Effect of Conventional Single Flocculant on Oilfield Wastewater

[0027] The flocculation effect takes the value of the optimal dosage of flocculant. The dosage of high molecular polymer coagulant is 50mg / L, COD Cr The analysis is carried out using the dichromate method (GB 11914-89) for the determination of chemical oxygen demand of water quality, the same as below.

[0028] Raw water COD Cr :561mg / L, PH: 7, the flocculation results are shown in Table 1.

[0029] Flocculant

Aluminum sulfate

(0.1%)

Ferric sulfate

(0.125%)

Ferrous sulfate

(0.15%)

Poly aluminum

(0.05%)

Polyiron

(0.05%)

COD after flocculation Cr

(mg / L) *

180

188

221

286

272

COD after flocculation Cr

(mg / L) **

185

188

219

276

232

[0030] * The molecular weight of the coagulant used is above 14 million

[0031] ** The molecular...

Embodiment 2

[0034] Compared with eddy current processing efficiency

[0035] Under the same experimental conditions, the total pressure dissolved air flotation method and the eddy current method were used to treat the wastewater. Aluminum sulfate was used as the flocculant, and the amount was 0.1% of the wastewater volume. The treatment results are shown in Table 2.

[0036] Method

[0037] Judging from the experimental results, the full-pressure dissolved air flotation method is used to flocculate wastewater, and the treatment effect is better than that of the vortex method.

Embodiment 3

[0039] Flocculation at different pH values

[0040] From the treatment effect of Example 1, the flocculation effect of aluminum sulfate is the most obvious. When detecting the influence of different pH values ​​on the flocculation, aluminum sulfate is used as the flocculant, and the amount is 0.1% of the wastewater volume.

[0041] Raw water COD Cr :561mg / L, PH: 7, treatment results are shown in Table 3.

[0042] PH value

[0043] From the results, when the pH value of wastewater is neutral, the flocculation treatment effect is better. In actual operation, the pH value should be adjusted to 7-8.

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Abstract

A flocculation-electric multi-phase catalysis process for treating the sewage in oil field includes such steps as air floating-flocculating treatment of sewage under 2-4 Pa, adding catalyst 0.01-0.1%of sewage quantity, applying DC electric field with 5-10 V and 50-400 mA, and catalytic oxidization to organic pollutant in sewage. Its advantages are high effect and low cost.

Description

Technical field [0001] The invention relates to industrial wastewater treatment, in particular to a flocculation-electric heterogeneous catalysis method for treating oilfield wastewater and a special flocculation device. Background technique [0002] Petroleum mining wastewater (oil-containing wastewater produced during oilfield mining) mainly contains petroleum and COD Cr , Volatile phenol, sulfide, SS and other pollutants. These oilfield wastewater is difficult to degrade organic wastewater, which is difficult to be treated by commonly used methods such as biochemistry, and must be treated with new technologies and new processes. [0003] The air flotation method is mainly to pass in or generate a large number of bubbles in the water to form a three-phase heterogeneous system of water, gas and the removed substance. Under the action of interfacial tension, bubble buoyancy and hydrostatic pressure difference, the bubbles and the removed substance The combined body floats to the ...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F9/06
Inventor 杨旭孙承林杜远化于永辉蔡钊荣
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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