Abstract
Coal chemical wastewater contains large number of phenolic substances, which cause great harm to the environment. The dephenolization of wastewater from coal chemical enterprises was investigated. Through the combined treatment of oil removal, concentration, adsorption and other processes, the final processing results achieved the anticipated goal.
Highlights
The main pollutants of coal chemical wastewater are ammonia, sulfide, phenolic substances, aromatic hydrocarbons and their derivatives
In the process of denitrification of coal chemical wastewater, solvent extraction with two isopropyl ether and methyl isobutyl ketone is widely used in industry [4-7]
The development of more efficient and economical dephenolization adsorption materials and the practicality of applying these materials remain the key points in the treatment process of the coal chemical wastewater [13-15]
Summary
The light components, such as ammonia nitrogen and volatile phenols in alkali wastewater, were extracted by distillation. Since ammonia nitrogen has a relatively low boiling point, it was distilled from the system first, after which volatile phenols were distilled with water, because they form an azeotrope mixture. The remaining wastewater in tower kettle contains large amounts of non-volatile phenols, which need further processing. Non-volatile phenol removal process The wastewater from the tower kettle was passed through a resin absorber tower. Nonvolatile phenols were adsorbed effectively by resin. With the combination of waste water, which come from the top of the distillation tower, this qualified water can be used in preparing coal water slurry. Wastewater containing non-volatile phenols resin adsorption tower qualified water. Preparation of adsorbent: The preparation method of YSP-NJ (05-C) NHB sulfonated
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