Method and apparatus for treating emulsified oil waste water

A technology for wastewater treatment and emulsified oil, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Complex process and other problems, to achieve the effect of saving investment and operating costs, wide COD concentration requirements, and simple process flow

Active Publication Date: 2007-10-17
BEIJING MUNICIPAL RES INST OF ENVIRONMENT PROTECTION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The chemical method and physical method can only achieve the degreasing effect, and the treatment degree is not high enough. The treated water still contains high organic pollutants, and the COD concentration cannot meet the discharge standard. A method, multi-stage series connection, resulting in long process, complex processing technology and other problems
[0004] (2) The treatment of high-concentration emulsified oil wastewater often needs to continue to use activated carbon adsorption, ultrafiltration and other tertiary treatment technologies to strengthen the tre

Method used

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  • Method and apparatus for treating emulsified oil waste water
  • Method and apparatus for treating emulsified oil waste water
  • Method and apparatus for treating emulsified oil waste water

Examples

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Embodiment 1

[0044] The oily waste water treated in Example 1 is emulsified oil waste liquid from an internal combustion engine plant, with COD<15000mg / L and oil concentration<3000mg / L. The daily processing capacity is 3.2t / d.

[0045] Follow the steps below to implement:

[0046] 1) Adjust the water volume and remove the upper oil slick in the quality separation adjustment tank;

[0047] The high-concentration emulsified oil waste liquid is discharged and stored in the quality separation adjustment tank for treatment, and the hydraulic retention time is 10 days, which can play a role in regulating water quality and quantity. The slick oil in the upper layer of the wastewater is intercepted by the oil separator, and then manually removed periodically or automatically skimmed by setting a float oil skimmer. The emulsified oil wastewater from which the slick oil has been removed is lifted by the submersible sewage pump located 1.0m away from the bottom of the tank to the demulsification ta...

Embodiment 2

[0057] With reference to Example 1, the implementation steps are the same as in Example 1. The oily wastewater treated in Example 2 is foundry release agent and cleaning fluid oily wastewater. The COD concentration of the release agent is about 20000-40000 mg / L, and the COD concentration of the cleaning solution is about 2000-4000 mg / L. Due to the intermittent and uncertain production, the ratio of the two streams of incoming water (mold release agent and cleaning solution) entering the treatment system is uncertain and irregular.

[0058] The oily wastewater enters the separation adjustment tank, demulsification tank, intermediate tank, and membrane bioreaction tank for treatment in sequence, and the generated sludge enters the sludge storage tank and dehydrator for treatment in sequence. The daily processing capacity is 24t / d, the hydraulic retention time of the quality separation adjustment tank is 1 day, and the demulsifier is Ca(OH) 2 and FeCl 3 . The middle pool is of...

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Abstract

The invention discloses a emulsified oil waste water processing method, comprises five steps such as separating oil and emulsion breaking, adding easy degrading material, deoiling by codegradation membrane biological method and mud processing, the invention combines codegradation mechanism with the application of a membrane bioreactor based on biological treatment of oily wastewater, has strengthened ability of biological processing oil contamination, has broken through the inhibition of oil for microorganism. The invention also discloses a emulsified oil waste water processing device, comprises a separating equalizing tank, a emulsion breaking tank, a middle tank and a membrane biological reaction tank connected successively, the produced mud is sent in a mud storing tank, a hydroextractor successively, a demulsifier feeding apparatus is arranged out of the emulsion breaking tank, a nutrient salt feeding apparatus is arranged out of the middle tank. The device requires widely for influent oil concentration of the bioreactor, COD concentration, has strong degradation ability to contaminant, processed effluent can reach the standard, produces a little mud and a little secondary pollution, has simple device technological process and saves investment and operating costs.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and relates to a biological treatment method and treatment equipment for oily wastewater, especially high-concentration emulsified oily wastewater. Background technique [0002] Emulsified oily wastewater is one of the more difficult types of oily wastewater, and its main components are engine oil or mineralized oil, emulsifier, lubricating preservative and water. The emulsified oil in the wastewater is very stable, not easy to destroy, and difficult to handle, because the wastewater contains surfactants to make the oil a stable emulsion, the particle size of the oil droplets is extremely small, and a layer of boundary film is formed on the surface, with With charge, an electric double layer is formed on the periphery of the oil droplets, which makes the oil droplets repel each other and is extremely difficult to approach, and has a certain stability in dynamics, so it is difficult to handle. ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/40C02F1/68C02F3/02C02F11/12
CPCY02W10/10
Inventor 杜兵刘寅孙艳玲曹建平何然
Owner BEIJING MUNICIPAL RES INST OF ENVIRONMENT PROTECTION
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