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Technique for treating sewage of high well and deep drilling well

A technology for treating process and sewage, which is applied in the field of high well depth drilling sewage treatment process, can solve the problem that coagulation cannot be effectively treated, and achieve the effect of reducing impact and saving operating costs

Active Publication Date: 2008-06-04
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this type of sewage, in order to meet the requirements of the national sewage discharge standard (GB8378-1996), make CODcr <150mg / l, petroleum <10mg / l, conventional coagulation, Fenton (mixture of hydrogen peroxide and ferrous iron) ), ozone oxidation and biochemical treatment methods cannot be effectively treated

Method used

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  • Technique for treating sewage of high well and deep drilling well
  • Technique for treating sewage of high well and deep drilling well

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Take the 2,500-meter-deep drilling sewage of a well mine, and the water quality of this sewage is shown in Table 2.

[0037] Table 2. The water quality of drilling sewage in a well mine

[0038]

[0039] First, add 10g / L calcium hydroxide to the sewage, and react for 30 minutes to form chemical precipitation with the sulfonic acid in the sewage; adopt the air flotation method, the hydraulic retention time is 20min, and carry out solid-liquid separation; after solid-liquid separation, the water is discharged Adjust the pH to 6-9, then add 400mg / l polyaluminum to react for 30min, carry out coagulation and demulsification, add 2ppm polyacrylamide for 30min precipitation and separation; after the coagulation process, adjust the pH of the effluent to 3.5 for ultrasonication Fenton oxidation (H 2 o 2 : 1500mg / l, Fe 2+ : 5mmol / L) After 4 hours, the pH was adjusted to neutral for solid-liquid separation; the effluent was oxidized by Fenton and carried out in the aerated b...

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Abstract

The invention relates to a treating technique used in sewage of high well and deep bore well, which employs the treating technique that focuses on coagulating sedimentation, first stage oxidation, biological treatment and second stage oxidation and assisted by the deep treating technique of solid-liquid separation, acid-base adjustment and second stage oxidation. After going through the treatment with the treating technique provided by the invention for the sewage of high well and deep bore well, the well water can reach national sewage discharge standard (GB8378-1996). The treating technique provided by the invention can not only reduce the influence of waste discharge on environment, but also save operation cost.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a treatment process for high well depth drilling sewage. Background technique [0002] During the drilling process of oil and gas fields, a large amount of sewage is produced, which is commonly known as drilling sewage. Usually a drilling sump must be excavated at the drilling site to store this part of the wastewater, which may cause soil, surface and groundwater pollution, and even endanger human health. Therefore, after the drilling operation is completed, they must be disposed of harmlessly. [0003] Common domestic drilling wastewater treatment methods include: direct discharge method, injection into safe formations, backfill method, solidification method, chemical treatment method, land cultivation method, recycling method and chemical oxidation method. For the close relationship, especially the oil-water wells with a depth of more than 2000 meters, the wa...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/66C02F1/52C02F1/72
Inventor 杨敏高迎新丁然安伟
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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