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Method for treating heavy emulsified oil in waste water

A technology for treating wastewater and emulsified oil, applied in separation methods, grease/oily substances/suspton removal devices, liquid separation, etc., can solve the separation effect of heavy emulsified oil wastewater that has not been reported, high energy consumption of air flotation separation, separation Low efficiency and other problems, to avoid transmission and circulation, simplify the processing technology and process, and simplify the process

Active Publication Date: 2011-12-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the high degree of emulsification, the emulsion droplets are very small and extremely stable, and the adsorption amount of stable oil droplets on the bubble interface is very small, so a large number of bubble interfaces are required to absorb emulsion droplets, and multi-stage air flotation is required to achieve the required separation effect. The energy consumption of air flotation separation is high and the separation efficiency is low. For example, CN101327966 discloses a jet dissolved air flotation process for heavy oil sewage, which includes a multi-stage separation technology including primary air flotation, jet dissolved air, and secondary air flotation.
[0005] In recent years, some new high-efficiency air flotation separation equipment and technologies have been reported, such as the cyclone flotation separation technology disclosed in US 2008 / 0006588, and the method and device for pressurized dissolved air flotation hydrocyclone oil-water separation disclosed in CN 1546196. The combination of air flotation deoiling and cyclone separation is used to deoil the oily wastewater feed liquid. None of the above documents have reported the separation effect on heavy emulsified oily wastewater.

Method used

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  • Method for treating heavy emulsified oil in waste water
  • Method for treating heavy emulsified oil in waste water
  • Method for treating heavy emulsified oil in waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The heavy emulsified oil in wastewater is separated by continuous operation mode and flocculation-circulation foam.

[0029] The wastewater is condensed water from heavy oil processing coking steam blowing in a refinery. The total COD is 22000mg / L, of which the COD of emulsified oil and other colloidal suspended matter is 20000mg / L, and the average diameter of emulsion droplets is 2.5μm. The diameter of the bubble section of the circulating foam separation tower is 192mm, and the height is 1500mm; the diameter of the foam section is 340mm, and the height is 680mm; the diameter of the overflow weir is 260mm, and the height is 90mm. Among them, the height of the first stage is 560mm; the center of the bottom of the reactor is equipped with a special microporous (average pore diameter of 3μm) columnar gas distributor (20mm in diameter, 60mm in height), and the liquid capacity is 42L. Inorganic flocculant is AlCl 3 , the dosage is 2.3g (ie 0.02mmol / g COD emulsified oil), a...

Embodiment 2

[0031] Batch operation mode, flocculation-circulation foam separation of heavy emulsified oil in wastewater.

[0032] Waste water and device are with embodiment 1. Inorganic flocculant is AlCl 3 , the dosage is 5.6g (that is, 0.05mmol / g COD emulsified oil), and it is prepared into an aqueous solution with a concentration of 47g / L, and is added to the bubbling section at a flow acceleration rate of 80mL / h; the dosage of polyacrylamide is 1.05mg, (that is, 25mg / L m 3 waste water), prepared into an aqueous solution with a content of 50mg / L, and added to the bubbling section at a flow rate of 14mL / h; the surfactant is sodium dodecylsulfonate (SDBS), and the dosage is 8.4g (that is, 10mg / g COD emulsified oil), prepared into an aqueous solution with a content of 10.5g / L, added to the bubbling section at a flow rate of 0.4L / h; the superficial gas velocity was 1.1cm / s, and the separation time was 1.5h. The effluent COD is 1400mg / L, and the removal rate of emulsified oil reaches 94%...

Embodiment 3

[0034] This example shows the removal effect of emulsified oil under the condition of different surfactant dosage, and adopts batch operation.

[0035] Waste water and device are with embodiment 1. Inorganic flocculant is AlCl 3 , the dosage is 2.3g (that is, 0.02mmol / g COD emulsified oil), and it is prepared into an aqueous solution with a concentration of 23g / L, and is added to the bubbling section at a flow acceleration rate of 50mL / h; the dosage of polyacrylamide is 1.05mg, (that is, 25mg / L m 3 Wastewater), prepared into an aqueous solution with a content of 50mg / L, added to the bubbling section at a flow rate of 14mL / h; the superficial gas velocity was 1.1cm / s, the surfactant was SDS, and the separation time was 2h. The amount of SDS is 0.84g (ie 1mg / g COD emulsified oil, solution concentration 5.3g / L, flow acceleration rate 80mL / h), 4.2g (ie 5mg / g COD emulsified oil, solution content 10.5g / L, flow acceleration rate 0.2L / h), 8.4g (ie 10mg / g COD emulsified oil, solution...

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Abstract

The invention relates to a method for treating heavy emulsified oil in wastewater. The method is characterized in that a treatment device is formed by a lower bubble section and an upper foam section, wherein the lower bubble section of the treatment device is an airlift inner-circulation reactor, and the upper foam section of the treatment device is an overflow box type gas-liquid separator; thepH value of the wastewater is regulated to 8-9, and the wastewater is introduced into the bubble section; air is introduced to a tower bottom, and flocculating agents and a surface active agent are added, wherein the amount of an inorganic flocculating agent is 0.02-0.1mmol / g COD (chemical oxygen demand), the amount of a polymer flocculating agent is 10-50mg / m<3> wastewater, and the amount of an anion surface active agent is 5-20mg / g COD and is not less than 15-20mg / m<3> wastewater; the emulsified oil is separated from the wastewater through collecting foam; the gas speed of an empty tower ismaintained at 0.5-1.5cm / s; the separation efficiency is high: the primary separation rate can reach above 90%; the process is simple: solid suspended matters in the wastewater are removed once; the energy consumption and the reagent consumption are low: the amount of the flocculating agents is low; and the process flow is short.

Description

technical field [0001] The invention relates to a method for removing heavy emulsified oil from crude oil processing wastewater. Background technique [0002] The processing of heavy crude oil, that is, heavy oil, will produce a large amount of wastewater containing heavy emulsified oil, including dehydration at the bottom of crude oil tanks, desalination and decalcification sewage, coking steam blowing condensate, etc. Compared with ordinary refinery wastewater and oilfield wastewater Its outstanding features are: ① High content of emulsified oil: In general, more than half of the oil in heavy crude oil processing wastewater exists in the form of emulsified oil. After removing slick oil and dispersed oil, more than 80% of COD is due to emulsified oil and Produced by colloidal suspended matter; ②Severe degree of emulsification and stable emulsion droplets: the diameter of emulsion droplets of heavy emulsified oil is usually only a few hundred nanometers to a few microns. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/40
Inventor 蒋国强熊良铨吕秀荣赵洲洋方新湘陈爱华丁富新于娟陈永立朱海霞
Owner PETROCHINA CO LTD
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