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Treatment method of chromium-containing high concentration organic wastewater

A technology of organic wastewater and treatment methods, applied in energy wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc.

Active Publication Date: 2012-08-01
SHANGHAI JIHUI REMONDIS ENVIRONMENT PROTECTION TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a new treatment method for high-concentration organic wastewater containing chromium in view of the shortcomings of the existing treatment methods for high-concentration organic wastewater containing chromium. The treatment method utilizes various industrial combinations to specifically treat This kind of wastewater, so that the total chromium, hexavalent chromium, and COD respectively meet the "Discharge Standard of Pollutants for Urban Sewage Treatment Plants" (GB18918--2002) Level B Standard or above

Method used

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  • Treatment method of chromium-containing high concentration organic wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The present invention is illustrated by treating this type of chromium-containing high-concentration organic wastewater produced by a certain steel factory as an example. The chromium-containing high-concentration organic wastewater of this type produced by this steel factory is 500 tons / year, and the water quality is as shown in table 1:

[0028] Table 1: Waste water quality of a steel factory (except for pH, other indicators are in mg / l)

[0029] indicators

pH

COD

TN

TP

Cr 6+

7.97

15300

256.8

3.1

[0030] See Table 2 for the effluent water quality after the treatment method of the present embodiment:

[0031] Table 2: Effluent water quality (except for pH, other indicators are in mg / l)

[0032] indicators

pH

COD

TN

TP

Cr 6+

6--9

≤60

≤30

≤0.02

[0033] Specific steps are as follows

[0034] 1. Pump the high-concentration c...

Embodiment 2

[0042] The present invention is illustrated by treating this type of chromium-containing high-concentration organic wastewater produced by a certain steel factory as an example. The chromium-containing high-concentration organic wastewater of this type produced by this steel factory is 1500 tons / year, and the water quality is as shown in table 1:

[0043] Table 3: Waste water quality of a steel factory (except for pH, other indicators are in mg / l)

[0044] indicators

pH

COD

TN

TP

Cr 6+

4.69

7890

189.5

1.5

5

[0045] See Table 2 for the effluent water quality after the treatment method of the present embodiment:

[0046] Table 4: Effluent water quality (except for pH, other indicators are in mg / l)

[0047] indicators

pH

COD

TN

TP

Cr 6+

6.98

55

30

0.8

0.05

[0048] Specific steps are as follows

[0049] 1. Pump the high-concentr...

Embodiment 3

[0057] The present invention is illustrated by taking the processing of this type of chromium-containing high-concentration organic wastewater produced by a certain steel factory as an example. The chromium-containing high-concentration organic wastewater of this type produced by this steel factory is 800 tons / year, and the water quality is as shown in table 1:

[0058] Table 3: Waste water quality of a steel factory (except for pH, other indicators are in mg / l)

[0059] indicators

pH

COD

TN

TP

Cr 6+

5.01

6585

169.5

0

6.8

[0060] See Table 2 for the effluent water quality after the treatment method of the present embodiment:

[0061] Table 4: Effluent water quality (except for pH, other indicators are in mg / l)

[0062] indicators

pH

COD

TN

TP

Cr 6+

7.85

26

15

0

0.05

[0063] Specific steps are as follows

[0064] 1. Pump the ...

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Abstract

The invention discloses a treatment method of chromium-containing high concentration organic wastewater. The method comprises: first adjusting the pH value of chromium-containing high concentration organic wastewater to 3-4, and then adding a reducing agent to reduce Cr<6+>; conducting continuous aeration stirring reaction; then under the conditions of aeration stirring, adding a coagulant, and carrying out continuous aeration stirring, adjusting the pH value to about 8, and then adding a flocculant; then bringing the treated wastewater into a vertical flow sedimentation tank for sedimentation; introducing the effluent water from the vertical flow sedimentation tank into an anaerobic acidification tank for anaerobic acidification treatment; letting the effluent water from the anaerobic acidification tank enter an anoxic tank for anoxic treatment; making the effluent water from the anoxic tank enter an aerobic tank for aerobic treatment; bringing the effluent water from the aerobic tank into a sedimentation tank for sedimentation; and leading the effluent water from the sedimentation tank into a disinfection tank for disinfection treatment, and carrying out up-to-standard dischargeon the disinfected effluent water. Employment of the treatment method provided in the invention to treat chromium-containing high concentration organic wastewater can make the total chromium, hexavalent chromium, and COD (chemical oxygen demand) respectively above the B standard of the first level in the ''Discharge standards of pollutants for municipal wastewater treatment plants''(GB18918-2002).

Description

Technical field: [0001] The invention relates to the technical field of organic wastewater treatment, in particular to a treatment method for high-concentration chromium-containing organic wastewater. Background technique: [0002] Chromium is one of the trace metal elements necessary for organisms and microorganisms, but more than a certain amount of chromium will bring great pressure to human beings and the environment and cause serious harm. It is generally considered that metallic chromium and divalent chromium are non-toxic, trivalent chromium has little toxicity, and hexavalent chromium compounds are the most harmful. Chromium-containing wastewater has attracted the attention of scholars in the industry because of its harmfulness and diverse and complex sources. In view of the harmfulness of chromium, countries all over the world have imposed strict restrictions on the emission form and amount of chromium. Domestic chromium discharge standards are: the upper limit of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/22
CPCY02W10/37
Inventor 马士龙张伟军王玉川刘正华谢炜
Owner SHANGHAI JIHUI REMONDIS ENVIRONMENT PROTECTION TECH DEV
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