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Pretreatment method for waste emulsion

A waste emulsion and combined treatment technology, applied in chemical instruments and methods, special compound water treatment, filtration treatment, etc., can solve the problems of difficult biodegradation, difficult to obtain treatment effect by demulsification method, and achieve simple operation and no production. The effect of secondary pollution and B/C ratio improvement

Inactive Publication Date: 2017-08-22
安徽汇泽通环境技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The waste emulsion is different from the general oily wastewater, which contains various oily substances (slick oil, emulsified oil, etc.), and also contains various additives that are difficult to biodegrade (rust-proof additives and extreme pressure additives). Soluble metals (Fe 2+ ), so traditional biochemical treatment methods and a single demulsification method (acid precipitation method, salt precipitation method, etc.) are difficult to achieve the expected treatment effect

Method used

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  • Pretreatment method for waste emulsion

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Experimental program
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Effect test

Embodiment 1

[0036] The present embodiment processes No. 1 tank waste emulsion according to the following steps:

[0037] (1) Pass the waste emulsion of No. 1 tank through the middle grid to remove large particles in the water;

[0038] (2) Subsequently, the waste emulsion is introduced into a homogeneous regulating tank, and the waste emulsion is separated into three phases of oil, water and sand;

[0039] (3) Introduce the separated water phase into the mixing adjustment tank 1, add 1.5g / L CaCl respectively 2 and 1.5g / L polyferric sulfate (PFS) for primary demulsification; CaCl 2 Dosing in the form of a solution with polyferric sulfate (PFS).

[0040] (4) The waste water after the demulsification is introduced into the solid-liquid separation device for solid-liquid separation, so that the generated solid precipitate is separated;

[0041] (5) Introduce the supernatant into the mixing adjustment tank 2 again, add a composite demulsifier and PAM for secondary demulsification; the compo...

Embodiment 2

[0047] The present embodiment processes No. 2 tank waste emulsion according to the following steps:

[0048] (1) Pass the waste emulsion of No. 2 tank through the middle grid to remove large particles in the water;

[0049] (2) Subsequently, the waste emulsion is introduced into a homogeneous regulating tank, and the waste emulsion is separated into three phases of oil, water and sand;

[0050] (3) Introduce the separated water phase into the mixing adjustment tank 1, add 1.5g / L CaCl respectively 2 and 1.5g / L polyferric sulfate (PFS) for primary demulsification; CaCl 2 Dosing in the form of a solution with polyferric sulfate (PFS).

[0051] (4) The waste water after the demulsification is introduced into the solid-liquid separation device for solid-liquid separation, so that the generated solid precipitate is separated;

[0052] (5) Introduce the supernatant into the mixing adjustment tank 2 again, add a composite demulsifier and PAM for secondary demulsification; the compo...

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Abstract

The invention discloses a pretreatment method for oil-containing waste liquid from machining. The method comprises the following steps: firstly, oil-containing waste liquid from machining passes a grating, in order to remove pollutants of large particles; the waste liquid passes a homogenizing and adjusting pot in order to realize three-phase separation of oil, water and sand; two-stage demulsification is carried out for separated water phase in order to destroy an emulsion, and solid-liquid separation is carried out; supernatant is separated after demulsification, the pH value is adjusted, and fenton oxidation is carried out; after the fenton reaction ends, the pH value is adjusted for deposition, and effluent enters a biochemical system. The oil-containing waste liquid with high COD from machining is directly subjected to simple two-stage demulsification and the fenton oxidation process, COD content is greatly reduced, turbidity is obviously reduced, B / C ratio is obviously increased, and biochemical treatment conditions are created. The method has the advantages of very low treatment cost, and simple operation without secondary pollution.

Description

technical field [0001] The invention relates to a method for pretreating mechanical processing oil-containing waste liquid by adopting a combined treatment process of two-stage demulsification and Fenton oxidation, belonging to the field of industrial wastewater treatment. Background technique [0002] During the processing of mechanical devices, the surface temperature of the processed devices rises rapidly, so the cutting fluid formulated with various functional chemical additives, mineral oil and other substances is used to cool and lubricate the cutting tools and workpieces. During the processing, the temperature of the cutting fluid keeps rising, and the temperature generally reaches 45-90°C. At this time, the unsaturated lipids and other substances in the cutting fluid are oxidized and decomposed, and the biodegradable organic components increase. Under suitable environmental conditions Microorganisms will grow in large numbers, which changes the composition of the cut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/001C02F1/38C02F1/40C02F1/5236C02F1/56C02F1/66C02F1/722C02F3/00C02F9/00C02F2001/007C02F2301/08C02F2305/026
Inventor 孙黎马瑶徐跃武
Owner 安徽汇泽通环境技术有限公司
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