Treatment and resource utilization for a non-biodegradable organophosphorus wastewater using micro-channel reactor

Tratamento e utilização de recursos para um efluente organofosforado não biodegradável usando reator de microcanal

ABSTRACT

This study aimed to develop a method to treat and reuse non-biodegradable organophosphorus industrial wastewater using the micro-channel reactor. As an important pharmaceutical and fine chemical intermediate, diethyl hydroxymethylphosphonate (DHP) produces large amounts of industrial wastewater, which poses a serious threat to natural environment and human health. It is of great value to find a treatment method of the DHP industrial wastewater with simple operation, good safety, low cost, and environment friendly. In this study, hydrogen peroxide (H₂O₂) and DHP industrial wastewater were reacted in the micro-channel reactor. Reaction conditions were optimized by adjusting reaction temperature, reaction time, reaction pressure, and sampling flow rate. The treated wastewater was further neutralized by sodium hydroxide (NaOH). After the oxidation and neutralization reaction of the DHP industrial wastewater, the removal rate of chemical oxygen demand (COD) in treatment wastewater can reach 97.3%. Moreover, after the treated solution being dried, the inorganic phosphate solid was obtained with the phosphorus content as high as 92.1%. It can realize the reuse of phosphorus resources for the DHP industrial wastewater.

Keywords:
non-biodegradable organophosphorus industrial wastewater; micro-channel reactor; resource utilization; treatment of wastewater; diethyl (hydroxymethyl)phosphonate