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A treatment method for reducing cod of sewage

A treatment method and sewage technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., to achieve the effects of low treatment cost, environmental protection, and efficient treatment

Inactive Publication Date: 2016-08-24
ZHEJIANG HENGHUA ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Primary treatment mainly removes suspended solid pollutants in sewage. Most physical treatment methods can only meet the requirements of primary treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The water quality of the treated sewage is: water temperature=12~28℃, COD=5000mg / L, BOD5=180~250mg / L, SS=150~200mg / L, NH4 +- N=80~90mg / L, NO2 -- N-- N<1.5mg / L, TP=7mg / L, pH=9.0~10.0.

[0024] A treatment method for reducing sewage COD:

[0025] (1) Cooling and degreasing: discharge the above-mentioned sewage into the cooling oil slick pool to achieve the effect of cooling and degreasing;

[0026] (2) micro-electrolysis treatment: then discharge into the micro-electrolysis cell for micro-electrolysis treatment, there are magnesium cations and iron cations in the electrolysis cell, micro-electrolysis produces hydroxide ions and iron ions, and carries out oxidation reaction with organic matter in the waste water. Reduced the value of COD, at this time the COD value is about 4200;

[0027] (3) Grease trap treatment: discharge the wastewater after electrolytic treatment into the grease trap, carry out neutralization reaction through lime to remove sulfate, and control the...

Embodiment 2

[0034] The water quality of the treated sewage is: water temperature=12~28℃, COD=6000mg / L, BOD5=180~250mg / L, SS=150~200mg / L, NH4 +- N=80~90mg / L, NO2 -- N-- N<1.5mg / L, TP=7mg / L, pH=9.0~10.0.

[0035] A treatment method for reducing sewage COD:

[0036] (1) Cooling and degreasing: discharge the above-mentioned sewage into the cooling oil slick pool to achieve the effect of cooling and degreasing;

[0037] (2) micro-electrolysis treatment: then discharge into the micro-electrolysis cell for micro-electrolysis treatment, there are magnesium cations and iron cations in the electrolysis cell, micro-electrolysis produces hydroxide ions and iron ions, and carries out oxidation reaction with organic matter in the waste water. Reduced the value of COD, at this time the COD value is around 4900;

[0038] (3) Grease trap treatment: discharge the wastewater after electrolytic treatment into the grease trap, carry out neutralization reaction through lime to remove sulfate, and control th...

Embodiment 3

[0045]The water quality of the treated sewage is: water temperature=12~28℃, COD=3000mg / L, BOD5=180~250mg / L, SS=150~200mg / L, NH4 +- N=80~90mg / L, NO2 -- N-- N<1.5mg / L, TP=7mg / L, pH=9.0~10.0.

[0046] A treatment method for reducing sewage COD:

[0047] (1) Cooling and degreasing: discharge the above-mentioned sewage into the cooling oil slick pool to achieve the effect of cooling and degreasing;

[0048] (2) micro-electrolysis treatment: then discharge into the micro-electrolysis cell for micro-electrolysis treatment, there are magnesium cations and iron cations in the electrolysis cell, micro-electrolysis produces hydroxide ions and iron ions, and carries out oxidation reaction with organic matter in the waste water. Reduced the value of COD, at this time the COD value is about 2500;

[0049] (3) Grease trap treatment: discharge the wastewater after electrolytic treatment into the grease trap, carry out neutralization reaction through lime to remove sulfate, and control the ...

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Abstract

The invention discloses a treatment method for reducing COD in sewage. The treatment method comprises the following steps: (1) temperature reduction and oil removal; (2) micro-electrolysis treatment; (3) treatment in an oil separator; (4) further oil spilling; (5) treatment in a UASB reactor: adding the wastewater into lignin and wollastonite powder to be uniformly mixed, discharging the mixture into the UASB reactor for anaerobic treatment, and repeating for several times to convert organic materials in the wastewater into methane; and (6) treatment in an aeration tank: pumping the wastewater into the aeration tank for aerobic treatment to further reduce the content of COD in the wastewater, then, discharging the treated sewage into a secondary sedimentation tank for sedimentation, and discharging sludge to obtain purified water.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a treatment method for reducing COD of sewage. Background technique [0002] Modern sewage treatment technology can be divided into primary, secondary and tertiary treatment according to the degree of treatment. Primary treatment mainly removes suspended solid pollutants in sewage, and most physical treatment methods can only meet the requirements of primary treatment. After primary treatment, BOD can generally be removed by about 30%, which does not meet the discharge standard. Primary treatment belongs to the pretreatment of secondary treatment. The secondary treatment mainly removes colloidal and dissolved organic pollutants (BOD, COD substances) in the sewage, and the removal rate can reach more than 90%, so that the organic pollutants can meet the discharge standards. Tertiary treatment, further treatment of refractory organic matter, nitrogen and phosphorus and other solu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 章永海章雄建
Owner ZHEJIANG HENGHUA ENVIRONMENTAL PROTECTION TECH CO LTD
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