Combination treatment method of 2-naphthol production wastewater

Abstract

The invention discloses a combination treatment method of 2-naphthol production wastewater, belonging to the technical field of wastewater treatment. The method comprises the steps of: respectively treating the 2-naphthol production wastewater through complexing extraction and liquid membrane separation technologies to ensure that the wastewater is easily subjected to biochemical treatment; and respectively carrying out alkali washing and demulsification on a load extraction agent and a load emulsion to ensure that the extraction agent and a liquid membrane oil phase are regenerated, wherein a concentrated solution contains high-concentration sodium phenolate and sodium naphthalene sulphonic and can be reused in production sections. The treatment method of the 2-naphthol production wastewater has the advantages that the COD (Chemical Oxygen Demand) in the wastewater is reduced from about 100000mg / L to about 3000mg / L; nonbiodegradable organic pollutants in the wastewater are greatly decreased; the biodegradability of the wastewater is increased; reduction and resource utilization of the pollutants in the 2-naphthol production wastewater can be realized at the same time; and a certain economic benefit is provided.

Description

technical field

[0001] The invention belongs to the field of chemical production wastewater treatment, and in particular relates to a combined treatment method for 2-naphthol production wastewater. Background technique

[0002] 2-Naphthol is an important synthetic intermediate of organic fine chemicals. It is prepared from naphthalene as raw material through sulfonation, neutralization, substitution and other chemical reactions. Naphthol production process produces high-concentration organic wastewater with complex components. The COD value of wastewater is as high as 100,000mg / L, and most of them are refractory to biodegradable substances, so direct biochemical treatment is difficult. This type of wastewater discharge is characterized by intermittent discharge, with a small amount but high pollution intensity.

[0003] At present, there are many studies on the resin adsorption process for the treatment of this type of wastewater. For example: Chinese Patent No.: 00132129....