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Method for treating petroleum refining waste water

A technology for refinery wastewater and treatment methods, which is applied in the directions of water/sewage multi-stage treatment, flotation water/sewage treatment, water/sludge/sewage treatment, etc. Degradation and other issues

Inactive Publication Date: 2011-11-30
大庆市新中瑞环保有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0019] At present, the biochemical section of domestic oil refinery wastewater treatment still stays within the framework of the design guiding ideology of "simple aerobic biochemistry (including the anoxic-aerobic deammonization nitrogen process of the A / O process)", and the COD of the total effluent is mainly difficult to degrade or The non-biodegradable organic matter is the main one. On this basis, if anaerobic or aerobic treatment is further adopted, there are problems that the microbial system is not easy to cultivate, maintain and the removal efficiency is extremely low. However, the physical adsorption or chemical advanced oxidation process also has The problem of high operating cost and total COD transfer

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  • Method for treating petroleum refining waste water
  • Method for treating petroleum refining waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0191] Embodiment 1: adopt the inventive method to process the refinery waste water of certain petroleum refinery

[0192] COD1500mg / L, NH of the refinery wastewater 3 -N80mg / l, petroleum 1500mg / L.

[0193] This is handled as follows:

[0194] A. Natural separation of oil and water

[0195] Allow petroleum refinery wastewater to flow into the cyclone oil-water separator produced by Yangzhou Hengchuan Environmental Engineering Co., Ltd., and the cyclone oil-water separator operates under the following conditions:

[0196] Water inlet pressure Atmospheric pressure -0.6MPa;

[0197] Water temperature 50-60℃;

[0198] The wastewater residence time was 40 minutes.

[0199] The aqueous heavy phase of the wastewater is thrown to the inner wall of the cyclone under the action of centrifugal force and discharged from the bottom outlet in a spiral state. The oil content of the discharged aqueous phase is less than 150 mg / L, while the oily light phase gathers towards the center of t...

Embodiment 2

[0243] Embodiment 2: Adopt the method of the present invention to process the refinery waste water of a refinery in Liaohe

[0244] The COD and petroleum of this refinery wastewater were 4500 mg / l and 1500 mg / l, respectively.

[0245] The implementation mode of this embodiment is identical with embodiment 1, just changes following condition:

[0246] The sewage treated in this embodiment is pure electric desalination sewage, the water quality is even worse, and the COD concentration is 4-5 times higher than that of conventional refinery sewage.

[0247] The oil separation unit adopts a two-stage oil separation tank of the advection type oil separation tank and the inclined plate grease separation tank.

[0248] The operating conditions of the hydrolytic acidification unit are as follows:

[0249] Inlet water temperature: 25℃

[0250] Influent COD: 2700mg / l

[0251] Influent B / C ratio: ≥0.2

[0252] Effluent B / C ratio: ≥0.35

[0253] Dissolved oxygen: 0.1mg / L

[0254] pH...

Embodiment 3

[0261] Embodiment 3: Adopt the method of the present invention to process the refinery wastewater of a refinery in Jinzhou

[0262] The CODCr and petroleum of this refinery wastewater were 1200 mg / l and 500 mg / l, respectively.

[0263] This embodiment implementation mode is identical with embodiment 1, just changes following condition:

[0264] The hydrolytic acidification tank adopts the fully mixed anaerobic activated sludge method, which is combined with the primary sedimentation tank to form an anaerobic hydrolytic acidification unit, and operates under the following conditions:

[0265] Water inlet pressure Atmospheric pressure;

[0266] Water temperature 20-25℃;

[0267] The wastewater residence time is 8h;

[0268] Sludge return ratio 50-100%

[0269] Dissolved oxygen 0-0.2mg / l

[0270] Sludge concentration 3000-4500mg / l

[0271] The aerobic biochemical unit adopts the plug-flow activated sludge method, that is, the plug-flow activated sludge reaction tank, and op...

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Abstract

The invention relates to a method for treating petroleum refining waste water. The method for treating petroleum refining waste water comprises the steps of a gravity oil-separating unit, a two-stage air floatation treatment unit, an anaerobic and aerobic two-stage biochemical treatment unit, a biochemical posttreatment unit and the like. Through the analysis of the specific implementation effect, the technical implementation effect of the method is much more excellent than the conventional technical standards. Compared with the prior art, the treatment effect of the method is obviously more excellent than the traditional process method; qualitative improvement on the quality of the treated water is achieved; the current newest national and local emission standard is completely met; and therefore, the method has a very wide application prospect.

Description

【Technical field】 [0001] The invention belongs to the technical field of wastewater treatment. More specifically, the present invention relates to a method for treating petroleum refinery wastewater. 【Background technique】 [0002] At present, the domestic treatment of oil refinery sewage still adopts the "old three sets" process in the main process route, that is, the process route of "oil separation-flotation-aeration". Over the past few decades, with the continuous deepening of domestic practice and theoretical research on the design of oil refinery wastewater, and with the rapid progress and development of environmental protection equipment technology, in terms of specific project design, the process flow and equipment selection have also been obtained. Great improvements and developments have been made, but its core concept still follows the design ideas of the "old three sets" of craftsmanship. In recent years, the development of each unit technology and equipment fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/24C02F3/30
Inventor 赵国峰戴爱临许建民王道国任建松赵国忠金星晃胡永志李广超
Owner 大庆市新中瑞环保有限公司
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