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Treatment method of high-chroma chemical waste water

A chemical wastewater treatment method technology, applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problems of high price, difficult regeneration, difficult to remove by biological methods, etc., and achieve improvement Efficiency and reduction of processing costs

Inactive Publication Date: 2011-08-03
SHANGHAI CHEM IND PARK SINO FRENCH WATERDEV
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  • Description
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  • Application Information

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Problems solved by technology

However, activated carbon is selective to dyes, and it is expensive and difficult to regenerate
In addition to the chromaticity problem, chemical oxygen demand (COD) often contains a large amount of difficult to degrade in chemical wastewater, which is difficult to remove by biological methods, and the effect of removing it by coagulation and dosing is not obvious. Taking corresponding measures, it is also difficult for COD in chemical wastewater to meet the discharge standard

Method used

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  • Treatment method of high-chroma chemical waste water
  • Treatment method of high-chroma chemical waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In a treatment plant that treats 50,000 tons of industrial sewage per day, the water quality of chemical wastewater at the entrance 1 is COD518mg / L, BOD 5 248mg / L, after treatment in the aerobic biological reaction tank 2: the concentration of activated sludge is about 5000mg / L, the residence time is 24 hours, the dissolved oxygen concentration is 2-4mg / L; stay in the secondary sedimentation tank 3 for about 14 hours , the sludge reflux ratio is 150%; after ozone oxidation treatment, the water quality of the effluent regulating tank 7 is COD110mg / L, and the removal rate is 79%; BOD 5 248mg / L, the removal rate is 97%.

Embodiment 2

[0036] The same as the sewage treatment plant in Example 1, the water quality of the chemical wastewater at the inlet 1 is COD 475mg / L, BOD 5 220.3mg / L, after treatment in aerobic biological reaction tank 2: the concentration of activated sludge is about 5000mg / L, the residence time is 24 hours, and the dissolved oxygen concentration is 2-4mg / L; stay in secondary sedimentation tank 3 for about 14 hour, the sludge reflux ratio was 150%; after ozone oxidation treatment, the water quality of the effluent regulating tank 7 was COD86mg / L, and the removal rate was 82%; BOD 5 2.18mg / L, the removal rate is 99%.

Embodiment 3

[0038] Ozone continuous experiment, the volume of the reaction device is 100L. Ozone is produced by the ozone generator 5, with pure oxygen as the gas source, and the amount of ozone produced is 4g / h. Ozone is transferred into the water body in the form of small bubbles through the bottom aeration device. The ozone concentration in the tail gas is measured, and then discharged after being destroyed by high temperature.

[0039] Experiments were carried out on the effluent of the secondary sedimentation tank 3 of the sewage plant: the influent flow rate was 40L / h, and the water was kept for 24 minutes. After treatment, the chromaticity was reduced from 186 degrees to 15 degrees (Pt-Co), and the removal rate was 92%; COD was reduced from 78mg / L was reduced to 56mg / L, and the removal rate was 28%; the ozone concentration in the tail gas was 1.4g / h.

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Abstract

The invention relates to a treatment method of high-chroma chemical waste water, relating to the technical field of industrial waste water treatment. The treatment method comprises the following steps of: (1) inputting the pretreated high-chroma chemical waste water into an aerobic biochemical treatment system for treatment; (2) treating in a solid-liquid separation system; (3) carrying out ozone oxidation treatment in an ozone treatment system comprising an ozone contact pond, an ozone generator, a porous aeration disc and an ozone destruction device; (4) introducing the treated industrial waste water into an outflow water regulation pond for treatment, then discharging, wherein the chroma of the outflow water is 19 degrees (Pt-Co), the content of COD (Chemical Oxygen Demand) is 69 mg / L, and the content of residual ozone contained in a tail gas is 1.7 g / h. The invention has the advantages of more effectively treating the high-chroma chemical waste water by increasing ozone decoloration treatment on the basis of a common activated sludge method and being capable of recycling the tail gas subjected to the ozone decoloration treatment for an aeration pond of the aerobic biochemical treatment system, effectively reducing the treatment cost and enhancing the treatment efficiency of the high-chroma chemical waste water.

Description

technical field [0001] The invention relates to the technical field of industrial waste water treatment, in particular to a treatment method for high-chroma chemical waste water, which is suitable for treating high-color chemical waste water. Background technique [0002] Most of the wastewater discharged by the chemical industry contains substances with complex structures, toxic and harmful, and difficult to biodegrade. It has the characteristics of high chemical oxygen demand (COD), high salinity, high chroma, and high toxicity. waste water. [0003] The biochemical treatment of wastewater belongs to the secondary treatment, and its main purpose is to remove unsinkable suspended solids and soluble biodegradable organic matter. There are various processes and treatment methods. But at present, most sewage treatment plants are using activated sludge method for wastewater treatment. The activated sludge method is to make the activated sludge in a suspended state and complet...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/78
Inventor 刘琴瞿贤康健灵
Owner SHANGHAI CHEM IND PARK SINO FRENCH WATERDEV
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