H-acid production wastewater treatment method

Abstract

The invention provides an H-acid production wastewater treatment method which comprises the following steps: adding ammonia water into a waste liquid at uniform speed and stirring until the pH value is 4-6, to obtain a crude processed liquid material; heating the crude processed liquid material obtained in the step S1 to evaporate water, and evaporating until the solid-liquid ratio reaches 28%-32%, to obtain an supersaturated material liquid; cooling and crystallizing the supersaturated material liquid obtained in the step S2, to obtain a mixed material liquid; and centrifuging the mixed material liquid obtained in step the S3, to obtain an inorganic salt solid fertilizer and an organic matter centrifugal liquid. The method has the beneficial effects that with use of different boiling points of organic matters and water in wastewater, the evaporation way is adopted for evaporating the water out, and the organic matters and inorganic salts are separated; the sticky colloidal organic matters and the solid inorganic salts are separated by the centrifugal way; the solid inorganic salts contain a lot of ammonium sulfate, and can be directly used as a fertilizer, so as to solve the technical problem that H-acid waste liquid is difficult to dispose.

Description

technical field [0001] The invention relates to the technical field of H-acid production, in particular to a method for treating H-acid production wastewater. Background technique [0002] H-acid, also known as 1-amino-8-naphthol-3,6-disulfonic acid, colorless crystal, is an important dye intermediate, mainly used in the production of acidic, reactive dyes and azo dyes, also Can be used in the pharmaceutical industry. Slightly soluble in cold water, easily soluble in hot water, soluble in alkaline solutions such as soda ash and caustic soda. Sulfuric acid (or hydrochloric acid) is added in the acid analysis process to precipitate H-acid monosodium salt, and the filtered waste liquid is a typical organic wastewater with high concentration, high chroma, and high biological toxicity. [0003] The main organic pollutants in the waste liquid are naphthalene and naphthalene derivatives, and the main inorganic salts are sodium sulfate and ammonium salts. Compared with other waste...

AI Technical Summary

Problems solved by technology

[0007] (4) High toxicity. H acid belongs to polycyclic aromatic hydrocarbons, which has strong biological toxicity. If the waste water is discharged directly without treatment, it will seriously pollute the environment and cause great harm to the human body;

The BOD of most wastewater in this type of wastewater 5 / COD is extremely low, has poor biodegradability, and is toxic to microorganisms, so it is difficult to treat with general biochemical methods

[0009] Regarding the methods for this kind of production wastewater treatment, there are mainly wet (catalytic) oxidation methods, photocatalytic oxidation methods, extraction methods (including liquid film extraction methods, complex extraction methods), etc. These methods have complex equipment, special Difficult to guarantee material quality, expensive chemicals, harsh operating conditions (such as high temperature, high pressure, etc.), high energy consumption, and secondary pollution

[0010] Aiming at the particularity and difficulty of H-acid production wastewater treatment, those skilled in the art have also carried out a series of explorations, for example: Chinese Patent Application No. 200710057544.1, provided in the patent name "a treatment method for H-acid production wastewater" It is the method of "adsorption by ion exchange resin". The Chinese application number is 200710057626.6, and the same is provided in the patent name "1-amino-8-naphthol-3,6-disulfonic acid production wastewater treatment and its recycling method". It is the method of "using ion exchange resin to adsorb"; Chinese patent application number 200510037697.0, the patent name is "method for purification and resource recycling of H acid production wastewater", and it provides "adsorption by using an adsorption tower filled with macroporous resin " method; the above method of using resin adsorption is more complicated to operate, and it is more difficult to control the nodes

Chinese patent application number 200710051622.7, patent name "adding sodium chloride method to treat H acid wastewater", provides the method of "adding a certain degree of sodium chloride, heating to volatilize hydrochloric acid, and extracting H acid and T acid"; this Heating under this method to volatilize hydrochloric acid from the liquid containing sodium salt requires a higher temperature, and it cannot be widely used in industrial production.

Chinese patent application number 200910234684.0, patent name "A Sunlight / Electricity-Fenton Chemical Treatment Method for Dye Intermediate H-Acid Wastewater", provides a method of "utilizing solar energy to generate electricity, and then electrolyzing the waste liquid", which requires Special solar power generation equipment, the cost is relatively high