Method for treating bamboo wood heat treatment wastewater

A technology of wood heat treatment and treatment method, which is applied in the field of treatment of bamboo wood heat treatment wastewater, and can solve the problems of low utilization rate of light energy, difficulty in realizing engineering, and difficulty in wastewater pretreatment.

Inactive Publication Date: 2019-05-07
ZHEJIANG FORESTRY ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing wastewater oxidation treatment mainly includes Fenton oxidation, ozone catalytic oxidation, wet oxidation, photocatalytic oxidation, ultrasonic oxidation and other oxidation methods. Each has its own advantages, but its disadvantages are also prominent. There are certain difficulties in the pretreatment of waste water from thermal treatment of bamboo and wood
Among them, the Fenton oxidation method uses a large amount of chemicals, excessive ferrous iron will increase the COD value of the treated wastewater, and the oxidation ability is not too strong, some organic matter cannot be destroyed, and the reaction time is long
Ultrasonic oxidation is still in the laboratory stage, and due to insufficient research on the degradation mechanism, reaction kinetics, and r...

Method used

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  • Method for treating bamboo wood heat treatment wastewater
  • Method for treating bamboo wood heat treatment wastewater
  • Method for treating bamboo wood heat treatment wastewater

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Experimental program
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Effect test

Embodiment 1

[0061] Raw bamboo wood heat treatment wastewater parameters: pH value 4.3, COD 21560mg / L, BOD 1850mg / L, B / C 0.086, chroma 2280, total sugar 17.54g / L, total nitrogen 131.2mg / L, TOC It is 4.62g / L.

[0062] Add a composite catalyst composed of acetic acid and 2mol / L hydrochloric acid (the mass ratio of acetic acid and hydrochloric acid is 1:4) to adjust the pH value of the wastewater to 3.8; continue to add 12wt% sodium hypochlorite aqueous solution, the addition amount is 1g / L. The obtained mixed solution is added into the cavity filled with the carrier, so that the total filling amount of the waste water after the acid treatment, the oxidizing agent and the carrier mixture is 90%. Wherein, the carrier powder is nano-titanium dioxide and subnano-level kaolin, the mass ratio of nano-titanium dioxide and sub-nano-level kaolin is 8:1, and the loading amount of the carrier powder is 10%.

[0063] Start the equipment for oxidative catalytic cracking: the treatment time is 10 minutes...

Embodiment 2

[0067] Raw bamboo wood heat treatment wastewater parameters: pH value 4.6, COD 20150mg / L, BOD 2370mg / L, B / C 0.118, chroma 2030, total sugar 19.03g / L, total nitrogen 119.8mg / L, TOC It is 4.55g / L.

[0068] Add a composite catalyst composed of acetic acid and 3mol / L sulfuric acid (the mass ratio of acetic acid and sulfuric acid is 1:3) to adjust the pH value of the wastewater to 3.9; continue to add 12wt% sodium hypochlorite aqueous solution in an amount of 0.8g / L. The obtained mixed solution is added into the cavity filled with the carrier, so that the total filling amount of the waste water after the acid treatment, the oxidizing agent and the carrier mixture is 90%. Wherein, the carrier powder is nano-titanium dioxide and subnano-level kaolin, the mass ratio of nano-titanium dioxide and sub-nano-level kaolin is 6:1, and the loading amount of the carrier powder is 8%.

[0069] Start the equipment for oxidative catalytic cracking: the treatment time is 15 minutes, the treatment...

Embodiment 3

[0072] Raw bamboo wood heat treatment wastewater parameters: pH value 4.0, COD 24290mg / L, BOD 2540mg / L, B / C 0.105, chroma 2360, total sugar 20.23g / L, total nitrogen 236.5mg / L, TOC It is 4.73g / L.

[0073] Add a composite catalyst composed of acetic acid and 2mol / L sulfuric acid (the mass ratio of acetic acid and sulfuric acid is 1:4) to adjust the pH value of the wastewater to 4.1; continue to add 12wt% sodium hypochlorite aqueous solution in an amount of 1.1g / L. The obtained mixed solution is added into the cavity filled with the carrier, so that the total filling amount of the waste water after the acid treatment, the oxidizing agent and the carrier mixture is 90%. Wherein, the carrier powder is nano-titanium dioxide and subnano-level kaolin, the mass ratio of nano-titanium dioxide and sub-nano-level kaolin is 9:1, and the loading amount of the carrier powder is 7%.

[0074] Start the equipment for oxidative catalytic cracking: the treatment time is 20min, the treatment temp...

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Abstract

The invention belongs to the field of wastewater treatment, and provides a method for treating bamboo wood heat treatment wastewater. The method comprises the following steps: adjusting the pH value of the bamboo wood heat treatment wastewater to be treated to 3.8-4.2 by using a composite catalyst in order to obtain pretreated wastewater; mixing the pretreated wastewater, an oxidant and a carrier,and carrying out catalytic oxidative cracking to obtain catalytic oxidative cracked wastewater; and carrying out solid-liquid separation on the catalytic oxidative cracked wastewater to obtain treated wastewater. An inorganic acid is mainly used for adjusting the pH value of the wastewater, and an organic acid can adjust the pH value, and also can promote the oxidant to release secondary oxygen due to its oxygen-containing structure in order to improve the oxidative degradation of polymeric organic matters in the wastewater; and the carrier has an adsorption effect, and can also catalyze sub-nano and nano-materials. The method can adjust the pH value of the wastewater, reduce COD, chroma, total sugar, total nitrogen and TOC and increase the B/C ratio of the wastewater.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating wastewater from thermal treatment of bamboo and wood. Background technique [0002] Bamboo wood heat treatment wastewater comes from the industrial production process of bamboo processing industry. Bamboo processing uses bamboo as raw material through mechanical or chemical processing, and its products still maintain the basic characteristics of bamboo. In the past few years, most bamboo processing enterprises did not have sewage treatment facilities, and the sewage was directly discharged into municipal pipes or directly into nature. With the improvement of people's living standards, people's requirements for the furniture industry are getting higher and higher, which makes the bamboo processing industry develop rapidly, resulting in the discharge of bamboo wood heat treatment wastewater generated in the bamboo processing process is also increa...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/30
Inventor 庄晓伟潘炘蒋应梯于海霞张文福王进
Owner ZHEJIANG FORESTRY ACAD
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