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Oil-mud-water three-phase integrated separation device and separation method

A separation device, water three-phase technology, applied in chemical instruments and methods, grease/oily substance/float removal devices, water/sludge/sewage treatment, etc., to achieve a wide range of applications, low operating costs, and high degree of automation Effect

Pending Publication Date: 2019-04-05
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the common problems caused by the coagulation air flotation technology used in the traditional grease trap, and to provide an oil-mud-water three-phase integrated separation device and separation method

Method used

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  • Oil-mud-water three-phase integrated separation device and separation method
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  • Oil-mud-water three-phase integrated separation device and separation method

Examples

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Embodiment 1

[0059] Such as Figure 1~2 As shown, this embodiment provides an oil-mud-water three-phase integrated separation device. The size of the separation device is Ф36×6m, which includes a reaction tank 1 and a sedimentation tank 2 that are set concentrically from the outside to the inside. Pool 1 and sedimentation tank 2 are interconnected cylinder structures; among them, the width of reaction pool 1 is 4m, that is, the difference between the outer diameter and inner diameter of reaction pool 1 is 8m, and the effective volume of reaction pool 1 is 2200m 3 .

[0060] The reaction tank 1 is connected with a water inlet pipe 11, and the bottom of the reaction tank 1 is provided with two propellers 12 for promoting the flow of fluid in the reaction tank 1, and the upper part of the reaction tank 1 is provided with an oil collecting device 13 radially. The device 13 is specifically configured as an oil collecting tank, and during actual production, a choice can be made between the oil ...

Embodiment 2

[0075] The wastewater treatment process used in this example is the same as that in Example 1, both of which are "oil separation treatment→oil-mud-water three-phase integrated separation→biological treatment", wherein the treated water volume of wastewater after oil separation treatment is 8630m 3 / d, the COD of wastewater is 761mg / L, and the oil content is 16.9mg / L.

[0076] The oil-mud-water three-phase integrated separation device of Example 1 is used to further treat the oil-separated wastewater. The specific steps are the same as in Example 1, except that the dosage of chemicals in the reaction tank is different. In the reaction tank, 180 mg of liquid polyferric sulfate (calculated as iron) and 5.0 mg of polyacrylamide were put into every L of waste water. The hydraulic retention time in the reaction tank, the oil separation zone and the sedimentation zone were 6.1h, 22min and 8.9h respectively, and the rest of the operating parameters were consistent with those in Exampl...

Embodiment 3

[0078] The wastewater treatment process used in this example is the same as that in Example 1, both of which are "oil separation treatment→oil-mud-water three-phase integrated separation→biological treatment", wherein the treated water volume of wastewater after oil separation treatment is 7380m 3 / d, the wastewater COD is 581mg / L, and the oil content is 14.8mg / L.

[0079] The oil-mud-water three-phase integrated separation device of Example 1 is used to further treat the wastewater after oil separation treatment. The specific steps are the same as in Example 1. The motor input power density is 1.82W / m 3 , the average flow rate of logistics is 0.5m / s, and the hydraulic retention time in the reaction tank, the oil separation zone and the sedimentation zone is respectively 7.2h, 25min and 10.4h, and all the other operating parameters are consistent with Example 1. The oil content of the water after the oil-mud-water three-phase integrated separation device is 7.8mg / L, and the C...

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Abstract

The invention discloses an oil-mud-water three-phase integrated separation device and separation method. The separation device comprises a reaction tank and a settling tank which are concentrically arranged in a sleeving manner from outside to inside, the reaction tank and the settling tank are of communicated cylinder structures, a guide cylinder is arranged in the settling tank and divides the settling tank into an oil separation area and a settling area from outside to inside, and the bottoms of the oil separation area and the settling area are communicated. The separation method includes the steps: performing reaction on wastewater to be treated and oil-water separation agents in the reaction tank; enabling mixed liquid to enter the oil separation area, separating oil from muddy water,returning oil to the reaction tank through a communicating hole, discharging the oil by an oil collection device, settling and separating the muddy water in the settling area, enabling clear water toflow up and discharging the clear water by an overflow channel. Applicable objects of the separation device and method include but not limited to petroleum refining waste on different scales after oil separation, effluent is low in oil content, the COD (chemical oxygen demand) value of subsequent biological treatment effluent can be reduced, the oil in the water can be recovered, sludge can be directly dewatered by a chamber type membrane filter press and is low in water content, operation is facilitated, and investment operating cost is low.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to an oil-mud-water three-phase integrated separation device and separation method. Background technique [0002] The treatment of petroleum refining wastewater usually adopts the method of "pretreatment + biological treatment". Good pretreatment can remove oil and mud, which is the key technology to achieve efficient biological treatment. [0003] Oil separation (including tank-in-tank oil removal) is a common oil removal technology. After oil separation, petroleum refining wastewater still contains part of emulsified oil and oily sediment. If it directly enters the biological treatment system, it will Negative impact on system operation and processing effect. In order to solve this problem, the more common method is to use two-stage coagulation air flotation. However, the coagulation air flotation technology usually has the following three problems: [0004] (1) There is a la...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCC02F1/40C02F1/5236C02F1/56C02F9/00C02F2001/007
Inventor 金锡标王远王新怡王涛王云飞
Owner EAST CHINA UNIV OF SCI & TECH