Deep treatment process of oily wastewater

A technology of advanced treatment and process method, applied in the fields of adsorption water/sewage treatment, petroleum industry, separation method, etc., can solve the problems of difficulty in regeneration and application limitation, and achieve the effect of stable treatment effect, low production and operation cost, and energy saving.

Active Publication Date: 2011-05-18
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Petroleum hydrocarbons in low-concentration oily wastewater are mainly dispersed oil and dissolved oil. The adsorption method can effectively treat petroleum hydrocarbon particles with a particle size of less than 10 μm, and the effluent quality is good, but its application is limited due to problems such as difficult regeneration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The specific implementation process of the present invention will be described below by taking the secondary air flotation effluent of an oil refinery as an example.

[0027] A kind of advanced treatment process of oily wastewater, the process is described as follows:

[0028] The main water quality indicators of the oily wastewater discharged from air flotation are as follows:

[0029] category

CODcr

Volatile phenol

pH

oil content

Content (mg / L)

378.1-720.7

37.5-43.9

3.4

37.6-51.2

[0030] 1) The air flotation effluent passes through the activated carbon adsorption tower with two columns connected in series, the bottom enters and the top exits, the adsorption residence time is 15min, the oil content of the effluent is controlled to be less than 1mg / L, and the wastewater can be treated up to 429BV. After continuing to adsorb, the oil content in the effluent is higher than 1mg / L, indicating that the adsorption s...

Embodiment 2

[0034] Taking the advanced treatment of oily wastewater in an oil production plant as an example, the specific implementation process of the present invention is described.

[0035] 1) Using self-made modified fly ash as the adsorbent, the fly ash and modifier solution (V 盐酸 :V 硫 酸 = 1:3) mix uniformly with gray water mass volume ratio of 1:1, carry out stirring reaction for 3 hours under the action of ultrasonic waves, and obtain modified fly ash adsorbent after drying.

[0036]2) The oily wastewater passes through the modified fly ash adsorption tower with two columns connected in series, the bottom enters and the top exits, the adsorption residence time is 10min, the oil content of the influent is (35.7-42.9mg / L), and the oil content of the effluent is controlled <1mg / L L, up to the standard treatment of wastewater 217BV. After continuing to adsorb, the oil content in the effluent is higher than 1mg / L, indicating that the adsorption site of the restructured adsorption to...

Embodiment 3

[0040] The specific implementation process of the present invention will be described below by taking the secondary air flotation effluent of an oil refinery as an example.

[0041] A kind of advanced treatment process of oily wastewater, the process is described as follows:

[0042] The main water quality indicators of the oily wastewater discharged from air flotation are as follows:

[0043] category

CODcr

Volatile phenol

pH

oil content

Content (mg / L)

378.1-720.7

37.5-43.9

3.4

37.6-51.2

[0044] 1) Mix the expanded graphite obtained by puffing at 900°C with rubber powder particles larger than 20 mesh in a ratio of 8:1, and pack the column by dry method, and put 3cm thick glass fiber on the upper and lower ends of the adsorption tower.

[0045] 2) The air flotation effluent passes through the expanded graphite-rubber powder adsorption tower with two columns connected in series, the bottom enters and the top exits, th...

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PUM

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Abstract

The invention relates to a deep treatment process of oily wastewater, which is characterized in that an absorption system and a regeneration system are provided in the process, wherein the absorption system is formed by a series of absorption tower groups with columns in series used for realizing parallel operation, the absorption tower groups are used for alternately performing deep treatment on oily yielding water with a low concentration of 30-50 mg/L of a traditional process, the absorption operation is carried out at normal temperature, the oil content in the yielding water is controlled to be lower than 1 mg/L through the treatment of a group of the absorption towers with columns in series, and an absorbing agent is made of modified fly ash, activated carbon and an expanded graphite absorbing material; when the yielding water in a group of the absorption towers exceeds a treatment requirement, the group of the absorption towers is switched to a biological regeneration system, and other absorption tower groups are simultaneously switched to the absorption system for continuous absorption; and saturated absorption towers are used for performing in-situ regeneration on the saturated absorbing agent by utilizing degradation ability of high temperature-resistant and efficient petroleum hydrocarbon for degrading bacteria.

Description

technical field [0001] The present invention relates to the technical field of industrial environmental protection and water treatment, and is a process method for advanced treatment of oily wastewater, which mainly adopts the method of combining physical chemistry technology and biochemical technology to realize the advanced treatment and reuse of current oily wastewater, thereby Achieve multiple effects of environmental protection, water saving and energy saving. Background technique [0002] With the development of industry and economy, human beings' demand for energy is increasing day by day, which promotes the rapid development of the petroleum industry; in the process of petroleum production, storage, transportation, refining, processing and use, there will inevitably be spillage of petroleum hydrocarbons and Discharge, causing oil pollution of soil and water. Some teratogenic and carcinogenic substances in petroleum can also directly endanger human health through bio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/40C02F1/28B01J20/34
Inventor 顾锡慧滕厚开陈军李立峰杨子立官赟赟王昊
Owner CHINA NAT OFFSHORE OIL CORP
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