Method for treating bamboo wood heat treatment wastewater

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...

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 reactor design and amplification of the sonochemical reaction process, it is still difficult to achieve engineering

The research and application of ozone catalytic oxidation method is still in its infancy, and the related technology and supporting equipment are not perfect enough.

The wet oxidation method needs to be carried out under high temperature and high pressure conditions, which requires high equipment materials (high temperature resistance, high pressure resistance and corrosion resistance), and the one-time investment cost of equipment is large

In photocatalytic oxidation, the absorption range of ultraviolet light is narrow, and the utilization rate of light energy is low, and its efficiency is also limited by the nature of the catalyst, the wavelength of ultraviolet light and the reactor.

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