2-naphthol production wastewater treatment method

Abstract

The invention discloses a 2-naphthol production wastewater treatment method. By adopting the method, 2-naphthol production wastewater is treated in an energy-saving way, 2-sodium naphthalene sulfonate and sodium sulfate in the 2-naphthol production wastewater are respectively recycled, and particularly the 2-sodium naphthalene sulfonate in the 2-naphthol production wastewater can be applied to a 2-naphthol production process as a production raw material resource, thus realizing virtuous cycle of wastewater treatment. The wastewater treatment method is characterized by comprising the steps of condensing 2-naphthol production wastewater to obtain a solid-liquid mixture containing initial mother liquor and a 2-sodium naphthalene sulfonate solid, delivering the solid-liquid mixture to a first crystal magma tank so as to separate the 2-sodium naphthalene sulfonate solid and the initial mother liquor in the solid-liquid mixture through the separation function of a first separation device, and recycling the 2-sodium naphthalene sulfonate solid, wherein the operation of condensing is implemented in a first effect evaporator; condensing the initial mother liquid in a second effect evaporator to obtain circulating mother liquor and a sodium sulfate solid, returning the circulating mother liquor to the second effect evaporator and condensing the circulating mother liquor again with the initial mother liquor.

Description

technical field

[0001] The invention relates to a 2-naphthol production wastewater treatment technology, in particular to a 2-naphthol production wastewater treatment method. Background technique

[0002] 2-Naphthol production wastewater has high chroma, high COD, and high salt content, which cannot meet environmental protection requirements through traditional biochemical degradation treatment. In the prior art, an extraction treatment method is used for 2-naphthol production wastewater, but this method consumes a lot of energy and chemicals, and does not involve the separate recovery of the salt therein. The inventors believe that if 2-naphthol production wastewater can be treated in an energy-saving manner, and sodium 2-naphthalenesulfonate and sodium sulfate in the 2-naphthol production wastewater can be recovered respectively, then a virtuous cycle of wastewater treatment can be realized. For example, the recovered sodium 2-naphthalenesulfonate can be used as a raw mat...