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Strengthened pretreatment process for oil refining wastewater

A technology for refining wastewater and pretreatment, which is applied in natural water treatment, flotation water/sewage treatment, and multi-stage water/sewage treatment. , to achieve the effect of improving volumetric efficiency, high resistance to mechanical wear, improving resistance to toxic substances and impact resistance

Inactive Publication Date: 2020-02-18
HUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high concentration of pollutants in oil refinery wastewater, complex components, and poor biodegradability, it is often difficult to make oil refinery wastewater meet the requirements for reuse or meet the discharge standards by only using the above-mentioned conventional processes.

Method used

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  • Strengthened pretreatment process for oil refining wastewater
  • Strengthened pretreatment process for oil refining wastewater
  • Strengthened pretreatment process for oil refining wastewater

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0020] The wastewater inflow of an oil refinery is 200m 3 / h, COD is 2700~3500mg / L, NH 3 -N concentration is 75-95mg / L. Adopt refinery waste water strengthened pretreatment process of the present invention to process, as figure 1 shown, including the following steps:

[0021] S1. Refinery wastewater is subjected to physical and chemical treatment through sedimentation tanks, air flotation tanks and grease traps;

[0022] S2. The wastewater treated in step S1 enters the internal circulation biological aerated filter. The internal circulation biological aerated filter is composed of 14 isolated internal circulation aerated bioreactors. The center of the isolated internal circulation aerated bioreactor is An aeration area is set, and the rest is a biological oxidation area. The biological oxidation area is filled with light non-metallic fillers, and its specific surface area is 8000m 2 / m 3 , with a porosity of 60%, the wastewater is in full contact with the air in the aerat...

Embodiment 2

[0025] The wastewater inflow of an oil refinery is 200m 3 / h, COD is 2700~3500mg / L, NH 3 -N concentration is 75-95mg / L. Adopting the refinery wastewater intensified pretreatment process of the present invention includes the following steps:

[0026] S1. Refinery wastewater is subjected to physical and chemical treatment through sedimentation tanks, air flotation tanks and grease traps;

[0027] S2. The wastewater treated in step S1 enters the internal circulation biological aerated filter. The internal circulation biological aerated filter is composed of 12 isolated internal circulation aerated bioreactors. The center of the isolated internal circulation aerated bioreactor is An aeration area is set, and the rest is a biological oxidation area. The biological oxidation area is filled with light non-metallic fillers, and its specific surface area is 8500m 2 / m 3 , with a porosity of 80%, the wastewater is fully contacted with the air in the aeration zone to be oxygenated, a...

Embodiment 3

[0033] The wastewater inflow of an oil refinery is 140m 3 / h, influent COD is 2500~2900mg / l, NH 3 -N concentration is 75-95mg / L. Adopting the refinery wastewater intensified pretreatment process of the present invention includes the following steps:

[0034] S1. Refinery wastewater is subjected to physical and chemical treatment through sedimentation tanks, air flotation tanks and grease traps;

[0035]S2. The wastewater treated in step S1 enters the internal circulation biological aerated filter. The internal circulation biological aerated filter is composed of 12 isolated internal circulation aerated bioreactors. The center of the isolated internal circulation aerated bioreactor is An aeration area is set, and the rest is a biological oxidation area. The biological oxidation area is filled with light non-metallic fillers, the filling rate is 25%, and the specific surface area of ​​the fillers is 6500m 2 / m 3 , with a porosity of 52%, the wastewater is in full contact wit...

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Abstract

The invention belongs to the field of wastewater treatment and discloses a strengthened pretreatment process for oil refining wastewater. The process comprises the following steps: the oil refining wastewater is firstly subjected to physico-chemical treatment and then enters an internal-circulation biological aerated filter for aerobic biological pretreatment, the filter employs an isolated-type aeration technology, an aeration zone is formed in the center position of the filter, the rest serves as a biological oxidation zone, the biological oxidation zone is filled with a light filler, the wastewater enters a precipitation tank after treatment, supernatant in the precipitation tank enters an effluent collection tank, effluent of the collection tank enters an anaerobic fluidized bed for hydrolyzed acidifying treatment, an anaerobic fluidized reactor is filled with a macromolecular organic filler, and the filler is loaded with an anaerobic biomembrane. According to the process, the CODof the oil refining wastewater can be lowered by 50% or more, the content of volatile phenols and sulfides in the wastewater is effectively lowered, meanwhile, the biodegradability of the wastewater is improved, the load of a subsequent biochemical unit of a wastewater treatment plant is reduced, and thus, the wastewater can be recycled and discharged after reaching standards. According to the process, the treatment effect is stable, the process is simple, the operating cost is low, and the maintenance is easy.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to an enhanced pretreatment process for oil refining waste water. Background technique [0002] The oil refining process consumes a lot of water. According to statistics, every ton of crude oil processed will produce more than 6 tons of wastewater. Usually, the COD of oil refining wastewater is as high as 1000-3000mg / L, NH 3 -N up to 100-500mg / L. The components in wastewater are very complex, including macromolecular fatty acids, alcohols, esters, heterocyclic compounds, aromatic hydrocarbons, etc., most of which are difficult to biodegrade. The treatment of conventional oil refinery wastewater adopts a combination of physicochemical and biological methods, such as sedimentation, air flotation, filtration and A / O2 treatment methods. However, due to the high concentration of pollutants, complex components, and poor biodegradability in oil refinery wastewater, it is ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/36C02F101/38C02F101/34C02F101/10
CPCC02F9/00C02F2001/007C02F1/24C02F1/40C02F3/30C02F2103/365C02F2101/38C02F2101/101C02F2101/345
Inventor 王春花封科军彭忠利
Owner HUIZHOU UNIV