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Treatment method of cutting fluid wastewater of automobile engine

A technology of automobile engine and treatment method, which is applied in the field of treatment of automobile engine cutting fluid wastewater, can solve the problems of unstable treatment effect, high operating cost, poor operating environment, etc., achieve reasonable design of process steps, reduce investment cost, and reduce use volume effect

Inactive Publication Date: 2016-06-22
SHANDONG ENVIRONMENTAL PROTECTION IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a treatment method for automotive engine cutting fluid wastewater in order to overcome the shortcomings of the prior art, such as large dosage, high operating costs, poor operating environment, and unstable treatment effect.

Method used

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  • Treatment method of cutting fluid wastewater of automobile engine
  • Treatment method of cutting fluid wastewater of automobile engine
  • Treatment method of cutting fluid wastewater of automobile engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Method of the present invention carries out as follows:

[0029] a. The cutting fluid wastewater is discharged from the workshop into the collection pool, and the cutting fluid wastewater is sent to the heating device through the lifting pump in the pool. The steam is heated to 90°C and kept for 14 hours to break the emulsion of the wastewater, and then pump the wastewater after demulsification into the The oil-water separator realizes the separation of oil and water; the grease scum is collected by the oil scraper and sent to a qualified grease processing unit for safe disposal;

[0030] b. Add municipal water and wastewater to the waste water after oil-water separation in step a according to the ratio of waste water: municipal water waste water = 1:4 volume parts, then use sodium hydroxide to adjust the pH value of the mixed solution to 9, and then use the waste water : flocculant = 100: 0.95 integral ratio to add polyaluminum chloride flocculant, after adding floccul...

Embodiment 2

[0037] Method of the present invention carries out as follows:

[0038] a. The cutting fluid wastewater is discharged from the workshop into the collection pool, and the cutting fluid wastewater is sent to the heating device through the lifting pump in the pool. The steam is heated to 100 ° C and kept for 12 hours to break the wastewater, and then pump the demulsified wastewater into the The oil-water separator realizes the separation of oil and water; the grease scum is collected by the oil scraper and sent to a qualified grease processing unit for safe disposal;

[0039] b. Add municipal water and wastewater to the waste water after oil-water separation in step a according to the ratio of waste water: municipal water waste water = 1:6 volume parts, then use sodium hydroxide to adjust the pH value of the mixed solution to 8, and then follow the waste water : flocculant = 100: 1.05 integral ratio to add polyaluminum chloride flocculant, after adding flocculant, add anionic pol...

Embodiment 3

[0043] Method of the present invention carries out as follows:

[0044] a. The cutting fluid wastewater is discharged from the workshop into the collection pool, and the cutting fluid wastewater is sent to the heating device through the lifting pump in the pool. The steam is heated to 95°C and kept for 13 hours to break the emulsion of the wastewater, and then pump the wastewater after demulsification into the The oil-water separator realizes the separation of oil and water; the grease scum is collected by the oil scraper and sent to a qualified grease processing unit for safe disposal;

[0045] b. Add municipal water and wastewater to the waste water after oil-water separation in step a according to the ratio of waste water: municipal water waste water = 1:5 parts by volume, then use sodium hydroxide to adjust the pH value of the mixed solution to 8.5, and then follow the waste water : flocculant = 100: 1.0 integral ratio to add polyaluminum chloride flocculant, after adding ...

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Abstract

The invention provides a treatment method for automobile engine cutting fluid wastewater. The treatment method is carried out in the following steps: a. First, send the water-based cutting fluid wastewater to a heating device to heat to 90-100°C, and keep it warm for 12-14 hours to make the wastewater break milk, and then carry out oil-water separation of the waste water after demulsification; b. Add dilution water to the waste water after oil-water separation in step a according to the ratio of waste water: dilution water = 1: 4-6 parts by volume, and then use sodium hydroxide Adjust the pH value of the mixed solution to 8-9, and then add the flocculant according to the proportion of waste water: flocculant = 100: 0.95-1.05, and then send the air to the flotation tank, and use the air flotation method to further remove the suspended matter and organic matter in the waste water; c .Send the waste water treated by air flotation in step b to the biological contact oxidation system. The biological contact oxidation system maintains the pH value of the waste water at 8-9, dissolved oxygen 3-5mg / L, and the residence time is 24-72 hours; d. The effluent treated by the biological contact oxidation system is filtered through the sedimentation tank, the multi-media filter tank and the activated carbon filter tank in sequence, and then discharged up to the standard.

Description

Technical field: [0001] The invention belongs to the technical field of automobile industry wastewater treatment, and in particular relates to a method for treating automobile engine cutting fluid wastewater. Background technique: [0002] Cutting fluid is one of the metal processing lubricants used in large quantities in the locomotive and automobile manufacturing industries. It has good lubricity, cooling and cleaning properties, and is widely used in various cutting processes. According to its type, it can be roughly divided into two categories: oil-based cutting fluid and water-based cutting fluid. Generally, those that are diluted with water are called water-based cutting fluids, and those that do not need to be diluted with water are called oil-based cutting fluids. Among them, the water-based cutting fluid is composed of chemical synthetic fluid, emulsion, and microemulsion. [0003] At present, there is a prominent environmental problem in the application of cutting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/16
CPCC02F9/00C02F1/001C02F1/02C02F1/24C02F1/40C02F1/52C02F1/5236C02F1/56C02F1/66C02F3/02C02F2103/16
Inventor 刘治华王顺刚周锋陈鹏何焱王留生徐展刘远涛孟祥媛
Owner SHANDONG ENVIRONMENTAL PROTECTION IND CO LTD
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