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Deep treatment process of oily wastewater

A technology of advanced treatment and process method, which is applied in biological water/sewage treatment, microorganism-based methods, adsorbed water/sewage treatment, etc. It can solve problems such as regeneration difficulties and application limitations, and achieve stable treatment effects and low production and operation costs. , the effect of reducing damage

Active Publication Date: 2012-02-08
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 is described below by taking the secondary air flotation effluent of an oil refinery as an example.

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

[0028] The main water quality indicators of oily wastewater 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 flotation effluent passes through the double-column series-connected activated carbon adsorption tower, and the bottom enters and the top exits. The adsorption residence time is 15min. After continuing the adsorption, the oil content in the effluent is higher than 1 mg / L, indicating that the adsorption site of the reorganized adsorption tower is occupied and needs to be regenerated. The tower is switched to an adsor...

Embodiment 2

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

[0035] 1) Select self-made modified fly ash as adsorbent, mix fly ash and modifier solution (V 盐酸 : V 硫 酸 = 1:3) Mix uniformly in a ratio of grey water mass to volume ratio of 1:1, carry out stirring reaction under the action of ultrasonic waves for 3 hours, 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 absorb, the oil content in the effluent is higher than 1mg / L, indicating that the adsorption site of the restructured ads...

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 the rubber powder particles larger than 20 mesh in the ratio of 8:1, and use the dry method to pack the column. The upper and lower ends of the adsorption tower are covered with 3cm thick glass fibers.

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

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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 onoily 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 controlledto 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 graphiteabsorbing 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 invention relates to the technical fields of industrial environmental protection and water treatment, and is a process method for advanced treatment of oily wastewater. Achieve multiple effects of environmental protection and water saving and energy saving. Background technique [0002] With the development of industry and economy, people's 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 and leakage of petroleum hydrocarbons. discharge, causing oil pollution of soil and water bodies. Some teratogenic and carcinogenic substances in petroleum can also directly endanger human health through bioaccumulation in the food chain. [0003] A considerable area of ​​the world is still in a state of water scarcity, so how to treat and reuse oily wastewater is of great prac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/40C12R1/265C12N1/00C12R1/385C12R1/40B01J20/34C12R1/125C12R1/10C02F3/34
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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