Emulsified liquid waste water treatment method

A technology for wastewater treatment and emulsification, applied in chemical instruments and methods, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc. Achieve the effect of good solid-liquid separation, less sludge and low oil content

Inactive Publication Date: 2010-05-05
无锡市林信环保工程有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The growth of microorganisms is extremely difficult, and a large amount of carbon-containing organic matter, nitrogen, phosphorus and other nutrients must be added. In addition, the substances in the emulsion wastewater have certain toxicity or other adverse effects on microorganisms, which inhibit the growth of microorganisms, so the emulsion wastewater should not be directly Microbiological treatment
[0007] Physical methods can be roughly divided into methods such as gravity separation, centrifugal separation, concentration separation, membrane separation, solvent separation, and adsorption separation. Among them, the membrane separation method has a relatively better treatment effect, but the amount of concentrated liquid produced by membrane separation is large and difficult to process. It is very difficult, and other physical methods are not effective in treating the effluent, and it is difficult to meet the discharge requirements of the third-level discharge standard of GB8978-1996 "Integrated Wastewater Discharge Standard"

Method used

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  • Emulsified liquid waste water treatment method

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Effect test

Embodiment 1

[0026] The workshop of a mechanical parts manufacturer in Wuxi City produces emulsion wastewater during the production process. The emulsion wastewater COD15780mg / l, pH6.7, mineral oil content is 1200mg / l, and the water volume is 0.8 tons / day. In order to treat the emulsion wastewater, another The domestic sewage of this enterprise is 1.6 tons / day, and the water quality of domestic sewage is COD326mg / l, pH6.9, of which domestic sewage enters 0.8 tons / day of domestic sewage treatment unit 2 of aerobic biochemical method, and enters 0.8 tons / day of anaerobic biological treatment unit 8. tons / day. After the emulsion is separated from oil and water, the water quality is COD7636mg / l, and the dosage of calcium hydroxide in the demulsification and solid-liquid separation unit is 1000mg / l, heated to 50°C, stirred for 10 minutes, and when it reaches normal temperature, add PAM10mg / l , the stirring reaction time is 10 minutes, after precipitation for 1 hour, the COD of the supernatant i...

Embodiment 2

[0028]The workshop of a mechanical parts manufacturer in Wuxi City produces emulsion wastewater during the production process. The emulsion wastewater COD15780mg / l, pH6.7, mineral oil content is 1200mg / l, and the water volume is 0.8 tons / day. In order to treat the emulsion wastewater, another The daily sewage of this enterprise is 3.2 tons / day, and the water quality of domestic sewage is COD326mg / l, pH6.9, of which domestic sewage enters 1.6 tons / day of domestic sewage treatment unit 2 of aerobic biochemical method, and enters 1.6 tons / day of anaerobic biological treatment unit 8. tons / day. The water quality of the emulsion after oil-water separation is COD7636mg / l, the dosage of calcium hydroxide in the demulsification and solid-liquid separation unit is 1000mg / l, heated to 50°C, stirred for 10 minutes, and when the temperature reaches normal temperature, add PAM5mg / l , the stirring reaction time is 10 minutes, after precipitation for 1 hour, the COD of the supernatant is red...

Embodiment 3

[0030] The workshop of a mechanical parts manufacturer in Wuxi City produces emulsion wastewater during the production process. The emulsion wastewater COD15780mg / l, pH6.7, mineral oil content is 1200mg / l, and the water volume is 0.8 tons / day. In order to treat the emulsion wastewater, another The daily sewage of this enterprise is 3.2 tons / day, and the water quality of domestic sewage is COD326mg / l, pH6.9, of which domestic sewage enters 1.6 tons / day of domestic sewage treatment unit 2 of aerobic biochemical method, and enters 1.6 tons / day of anaerobic biological treatment unit 8. tons / day. The water quality of the emulsion after oil-water separation is COD7636mg / l, the dosage of calcium hydroxide in the demulsification and solid-liquid separation unit is 1000mg / l, and the stirring reaction time is 30 minutes. Minutes, after 2 hours of static precipitation, the COD of the supernatant was reduced to 2971mg / l, the supernatant entered the pH adjustment unit 6, and the pH was adj...

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Abstract

The invention discloses an emulsified liquid waste water treatment method; in the method, active life sludge culture is carried out to domestic sewage, the life sludge generated in the domestic sewage treatment process is utilized to carry out adsorption treatment to pollutants of the emulsified liquid waste water, so as to skillfully use nutritive materials in the domestic sewage and the active sludge generated in the domestic sewage treatment process. Heating treatment and the operation of feeding the combination of lime milk and polyacrylamide PAM are carried out in the emulsified liquid breaking and solid-liquid separation links, aluminium polychlorid or polyferric sulfate or other coagulant is not used, the sludge amount is less and the solid-liquid separation effect is good when sedimentation is carried out. A chemical method, a microorganism method and a physical method are systematically combined, by adopting skillful process combination and on the basis of low cost operation, the oil content of the generated solid sludge is low, so as not to need to treat the solid sludge as hazardous waste and lead the emulsified liquid waste water to reach the three-level discharge standard requirements of GB8978-1996 integrated wastewater discharge standard.

Description

Technical field [0001] The invention relates to a method for treating emulsion wastewater, especially a method for treating emulsion wastewater produced in metal surface treatment and mechanical processing industries, which can be used in the treatment of emulsion wastewater in metal surface treatment, and belongs to environmental engineering and water treatment technology field. Background technique [0002] The main pollutant components of emulsion wastewater are mineral oil, emulsifier, release agent and rust inhibitor, etc., and also contain part of nitrite. The appearance is milky white and dark yellow, with a strong rancid smell. [0003] At present, the wastewater treatment process is divided into three categories, chemical method, microbial method and physical method. [0004] in: [0005] Chemical methods can be roughly divided into combustion method, displacement method, coagulation method and acidification method, etc. The most commonly used method is chemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30C02F1/40C02F1/66C02F11/12
Inventor 张占业谢庆邹建潘周宇王开林
Owner 无锡市林信环保工程有限公司
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