Ozone pre-oxidation and laccase advanced water treatment method

A pre-oxidation and water treatment technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as increased cost, large enzyme consumption, and reduced catalytic effect. Achieve the effect of saving the amount, reducing the amount of coagulant and promoting decomposition

Active Publication Date: 2010-09-01
NANJING SHENKELONG ENVIRONMENTAL PROTECTION
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Problems solved by technology

This technical literature has also clarified that laccase has the highest enzyme activity at a certain temperature, and whether it is lower than or higher than this temperature, its enzyme activity will be reduced to some extent, so that the catalytic effect is reduced, the enzyme consumption is large, and the cost is increased. Big
This shows that it is difficult for enzymatic technology to meet the water quality requirements of the new national discharge standards when the water temperature is low in winter and the COD concentration is relatively high.

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Examples

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Embodiment 1

[0029] Embodiment 1: papermaking wastewater

[0030] A paper company in Zhangjiagang, with an annual output of 80,000 tons of paper products, uses waste paper pulp to make containerboard paper. During the production process, sizing agents and dyeing agents are added. The wastewater is treated after flocculation and sedimentation + anaerobic and aerobic aeration biochemical secondary treatment. Fully closed loop. The effluent chroma and COD of the secondary sedimentation tank after biochemical treatment in this plant are very high, especially in winter when the water temperature is low, the treatment efficiency of the biochemical treatment unit is low, the chroma is greater than 400 times, the COD is greater than 500mg / l, and the conductivity is greater than 2000us / cm. The effect of recycled water on the paper chemicals used is affected, and it is difficult to reuse wastewater continuously. The present inventor has respectively implemented separate use of H to the waste wate...

Embodiment 2

[0049] Embodiment 2: printing and dyeing wastewater

[0050] Take the wastewater from a printing and dyeing factory after biochemical secondary treatment, COD269mg / L, the specific treatment method is the same as the above specific implementation 1, the difference is that the amount of ozone is 20mg / L, the reaction time is 5min, and the amount of sodium percarbonate is 0.1‰. The enzyme activity of laccase is 853IU / ml, and the dosage is 12IU / L. Acetic acid is selected as the mediator, and the dosage is 30mg / L.

[0051] For comparison of water quality data before and after treatment, see Figure 5 Shown:

[0052] From Figure 5 It can be seen that the present invention treats the printing and dyeing wastewater COD to 46mg / L, the removal rate reaches 83%, the chromaticity treatment drops to 13 times, the removal rate reaches 95%, and the water quality after treatment reaches the first-class discharge standard. The final water can be reused in multiple process units such as des...

Embodiment 3

[0053] Embodiment 3: beer wastewater

[0054] The wastewater from a brewery was added with flocculant polyacrylamide, and then separated from solid and liquid in the primary settling tank. Part of the activated sludge in the settling tank flows back. The sludge in the primary settling tank and the excess activated sludge in the secondary settling tank are carried out by pressure filtration. Take the effluent from the secondary sedimentation tank (i.e. the wastewater after secondary biochemical treatment), COD143mg / L, chroma 156 times. The processing method of concrete implementation is with above concrete implementation 1, and difference is that ozone consumption 10mg / L, reaction times 4.5min, sodium percarbonate consumption 0.3‰. The enzyme activity of laccase is 853IU / ml, and the dosage is 8IU / L. The mediator is p-hydroxycinnamic acid, the dosage is 30mg / L.

[0055] For comparison of water quality data before and after treatment, see Figure 6 Shown:

[0056] From Fi...

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Abstract

The invention relates to an ozone pre-oxidation and laccase advanced water treatment method, which comprises the following steps of: mixing waste water, ozone and sodium percarbonate in a mixer; adding the mixture in an ozone reactor device for stirred reaction; making the mixture enter a tertiary sedimentation basin for solid-liquid separation; adding the separated supernate and laccase into a laccase reaction tank, and fully mixing the laccase with the waste water for reaction; mixing the diluted mediator and the effluent from the laccase reaction tank, and performing flocculent settling solid-liquid separation on the mixture in a final sedimentation basin; and performing anaerobic and aerobic biochemical treatment on the effluent. The method overcomes the defects of over-high cost, low efficiency of enzyme treatment, high enzyme consumption, difficult sedimentation and separation of enzyme per se, and the like. The method only makes two processing units of ozone pre-oxidation and laccase-mediator catalytic polymerization achieve good mutual acceleration and gradient treatment effects, accelerates decomposition of O3 to make micro-flocculation effect of the ozone pre-oxidation in the optimized pH value range, is favorable for reducing the coagulant consumption, can recycle the waste water, and has scale application.

Description

Technical field: [0001] The invention relates to the field of advanced water treatment, in particular to an ozone preoxidation-laccase advanced water treatment method. Background technique: [0002] my country's industrial wastewater discharge standards have been upgraded. After biochemical secondary treatment of papermaking, starch, wine and other wastewater, the chroma of the wastewater is still high and contains some organic substances that are difficult to biodegrade. Therefore, advanced water treatment must be implemented. In recent years, different oxidation methods and their combined advanced water treatment technologies have emerged, such as: UV / H 2 o 2 / Fe 2+ 、H 2 o 2 / Fe 2+ , O 3 / H 2 o 2 , the main disadvantages of the catalytic oxidation method: the need to repeatedly adjust the pH value, high cost of use, a large amount of chemical sludge is produced and it is difficult to dehydrate, and there is secondary pollution. Ozone can oxidize and decompose orga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 田宝凤赵光勇陈龙贝陈芸张玉生
Owner NANJING SHENKELONG ENVIRONMENTAL PROTECTION
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