Device and method for treating pulping wastewater by catalyst and ozone

A technology for pulping wastewater and ozone treatment, which is applied in chemical instruments and methods, oxidized water/sewage treatment, processing wastewater treatment, etc. problems, to achieve the effect of improving the oxidative degradation effect, improving the degradation and removal effect, and convenient operation and maintenance

Inactive Publication Date: 2012-04-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the current technical conditions, the wastewater in the middle stage of pulping cannot meet the national discharge standards after physical and chemical combined biological treatment, so advanced treatment must be carried out before being discharged into the environmental water body
There have been studies on the application of ozone to treat pulp and paper industry wastewater, and achieved obvious results in removing the chroma of wastewater and improving its biological treatment, but the effect of ozone on the removal of organic matter in pulp wastewater is not ideal
On the other hand, in the process of ozone treatment of wastewater, there is a problem that the utilization rate of ozone is low, and a large amount of ozone that has not participated in the reaction is discharged along with the tail gas, which makes the treatment cost higher

Method used

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  • Device and method for treating pulping wastewater by catalyst and ozone
  • Device and method for treating pulping wastewater by catalyst and ozone

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Experimental program
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Effect test

Embodiment 1

[0047] The device and method provided by the present invention are used to treat the secondary biological treatment effluent of the wastewater in the middle stage of pulping, the water temperature is 30°C, and the COD cr It is 319~350mg / L, and the chromaticity is 470C.U..

[0048] Activated carbon supported manganese oxide is used as a catalyst, and the mass of the manganese oxide is 10% (wt, %) of the activated carbon. The aqueous solution of manganese acetate was mixed with activated carbon, shaken at 300 rpm and 30°C for 2 hours, evaporated to dryness at 60°C, then dried, incinerated at 600°C for 3 hours, cooled and sieved to obtain the catalyst.

[0049] The effluent flow rate of secondary biological treatment of pulping wastewater is 2.5L / min, the pH value is 8, the gas flow rate in the ozone pipe is 1L / min, the ozone concentration is 40mg / L, and the treated wastewater COD cr The removal rate is 63.9%, the chroma removal rate is 95%, the COD of wastewater cr The removal...

Embodiment 2

[0052] The device and method provided by the present invention are used to treat the secondary biological treatment effluent of the wastewater in the middle stage of pulping, the water temperature is 30°C, and the COD cr It is 319~350mg / L, and the chromaticity is 470C.U..

[0053] Titanium oxide supported on activated carbon is used as a catalyst, and the mass of titanium oxide is 5% (wt, %) of the activated carbon. Mix the aqueous solution of titanium sulfate with activated carbon, vibrate at 200 rpm and 20°C for 2 hours, evaporate to dryness at 50°C, then dry, incinerate at 400°C for 5 hours, cool and sieve to obtain the catalyst.

[0054] The effluent flow rate of the secondary biological treatment of pulping wastewater is 2.5L / min, the pH value is 9, the gas flow rate in the ozone pipe is 1L / min, and the ozone concentration is 40mg / L. The result is that the wastewater COD cr The removal rate is 65.8%, the chroma removal rate is 96%, the COD of wastewater cr The removal r...

Embodiment 3

[0056] The device and method provided by the present invention are used to treat the secondary biological treatment effluent of the wastewater in the middle stage of pulping, the water temperature is 30°C, and the COD cr It is 319~350mg / L, and the chromaticity is 470C.U..

[0057] Active carbon supported manganese oxide and nickel oxide are used as catalysts, and the quality of manganese oxide and nickel oxide is 10% (wt, %) of the active carbon. After mixing the aqueous solution of manganese acetate and nickel nitrate with active carbon, shake at 100rpm and 30°C Evaporate to dryness at 60°C for 2 hours, then dry, incinerate at 500°C for 4 hours, cool and sieve to obtain the catalyst.

[0058] The effluent flow rate of secondary biological treatment of pulping wastewater is 2.5L / min, the pH value is 10, the gas flow rate in the ozone pipe is 1L / min, and the ozone concentration is 40mg / L. The result is that the wastewater COD cr The removal rate is 71.4%, the chroma removal ra...

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Abstract

The invention discloses a device and method for treating pulping wastewater by a catalyst and ozone. The device comprises a first-order reactor and a second-order reactor in which an active adsorption material load transition metal oxide catalyst is arranged, an exhaust receiving bottle, an ejector and a pump, wherein a first water inlet, a first water outlet and a reflux inlet are arranged on a tank body of the first-order reactor, a first ozone inlet and an exhaust outlet are arranged on a top cover, and an aerator is arranged in the tank body; a second water inlet, a second water outlet, athird water outlet and a sampling port are arranged on a tank body of the second-order reactor, and a second exhaust port is arranged on a top cover. The wastewater firstly enters the first-order reactor, is pumped into the ejector and the second-order reactor to be treated by the catalyst and the ozone so as to realize the effective degradation of organic matters in the wastewater. In the deviceand the method, the treatment effect is good, the ozone utilization rate is high, the operation and maintenance are convenient, the investment is low, the COD (Chemical oxygen demand) removal rate ismore than 60%, and the decolorization removal rate reaches more than 92%.

Description

technical field [0001] The invention relates to a treatment process for pulping and papermaking wastewater, in particular to a device for treating pulping wastewater with a catalyst and ozone and a treatment method thereof. Background technique [0002] Ozone is a strong oxidant with an oxidation-reduction potential of 2.07. It has strong oxidative degradation ability to most organic substances and has the characteristics of fast reaction speed. Ozone can be used to pretreat wastewater before biological treatment, improve the ability of wastewater to be degraded by microorganisms, and improve the biological treatment effect of wastewater; ozone can also be used for advanced treatment of wastewater after biological treatment to degrade and remove the biological treatment of wastewater Residual organic matter that cannot be removed during the process, and decolorization of wastewater. Existing studies have shown that ozone oxidation is effective in degrading refractory organi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/78C02F103/28
Inventor 雷利荣李楠李友明
Owner SOUTH CHINA UNIV OF TECH
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