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Treatment method of spent water from cleaning machinery parts

A technology for mechanical parts and waste water cleaning, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of difficult water discharge and low treatment efficiency, and shorten the treatment time Time, good processing effect, short processing time

Inactive Publication Date: 2004-10-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of low efficiency of physical and chemical treatment of wastewater containing high-concentration emulsified oil, dissolved oil and surfactant in the prior art, and the effluent is difficult to meet the standard, and to provide a mechanical part suitable for containing surfactant components. Treatment method of parts cleaning wastewater

Method used

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  • Treatment method of spent water from cleaning machinery parts
  • Treatment method of spent water from cleaning machinery parts
  • Treatment method of spent water from cleaning machinery parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A certain oil washing wastewater is white emulsion, pH 7.1, COD concentration 958mg / L. Take 800mL of wastewater water sample and add it to the electrolysis equipment with a volume of 1000mL at one time, and the anode is A 3 Steel plate, the cathode is graphite plate, the distance between the plates is 10mm, the voltage is 15V, the current is 1A, and the current density is 179A / m 2 , sampling every 15 minutes. The processing results achieved through different processing times are shown in Table 1:

[0030] COD (mg / L)

Embodiment 2

[0032] The oil washing wastewater of a machine processing is white emulsion in appearance, with a small amount of slick oil on the surface, pH 6.8, COD concentration 2311mg / L. The test conditions are the same as in Example 1. The results are shown in Table 2:

[0033] COD (mg / L)

Embodiment 3

[0035] The oily waste water on the surface of a certain stamping part was white yellowish emulsion, with more floating oil on the surface, pH 6.6, COD concentration 3157mg / L, 800mL waste water sample was taken, and the batch treatment method was adopted, with A 3 The steel plate is the anode, the graphite plate is the cathode, the distance between the plates is 8mm, the voltage is 15V, the current is 1.5A, and the current density is 268A / m 2 , the processing results achieved at different processing times are listed in Table 3:

[0036] COD (mg / L)

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Abstract

A process for treating the sewage generated by washing mechanical parts features that electrolysis, flocculating and air-floating are performed in a single equipment, and includes such steps as regulating pH value to 5-9, COD concentration to 200-15000 mg / L and electric conductivity to 10 to the power (-2- -4) S / cm, stirring, loading in an electrolytic equipment, and performing electrolyzing, redox, flocculation and air floating. Its advantage is high effect on removing COD, emulsified oil, dissolved oil and surfactant.

Description

technical field [0001] The invention relates to a method for treating cleaning wastewater in the field of machining and its application and equipment. In particular, the invention relates to a method for treating waste water produced in the process of cleaning engine oil on mechanical parts and its application and equipment. Background technique [0002] Mechanical parts often need to be lubricated and protected during the manufacturing process, and various machine oils attached to their surfaces must be cleaned and removed before they are made into finished products. Due to the use of surfactants in the cleaning process, the oil and water form a uniform and stable emulsion. The main characteristics of this type of wastewater are: white emulsion, a small amount of floating oil on the surface, pH 5-9, CODcr 500-10000mg / L, far exceeding the national discharge standards, and must be treated before being discharged. [0003] At present, for the cleaning wastewater of mechanica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/02C02F9/06
Inventor 高明华薛金城叶晶菁梁云刘凌旭侯秀华高琳琳
Owner CHINA PETROLEUM & CHEM CORP
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