[vc_row fluid=”” full_content=”” bg_cover=”” parallax=”” bg_overlay=”” overlay_opacity=”0.5″ row_padd=”no-padding”][vc_column width=”1/2″][vc_column_text]This is a wastewater treatment process that combines thermal separation of soluble substances in water with the purification of volatile organic compound (VOC).
The appropriate waste to be treated by evapo-oxidation (evaporation and oxidation processes) are waters of organic nature (not organ halogen), with or without the presence of salts and other inorganic compounds (by-products of nitrogen, sulfur), with low net calorific values (NCV), those that are non-flammable nor solvents and that contain significant COD values.
In the first stage, the effluent undergoes an evaporation process generating water vapor that carries the volatile compounds that already have a lower boiling point than water. Additionally, they also carry all the substances that form azeotropic mixtures.
After this first stage, the water vapor that is obtained is sent together with the volatile substances to an oxidation chamber where the water vapor is burned, thereby preventing its emission into the atmosphere or any other contaminating activity.
Thus, thermal oxidation of the water vapor can completely destroy volatiles within the effluent.
Another option is to use these volatile compounds (if and when they are in elevated presence) to carry out an auto thermal process since the heat generated during their combustion is sufficient enough to not require external heat. Thus, one can obtain the energy needed to power the process itself.[/vc_column_text][/vc_column][vc_column width=”1/2″][vc_single_image image=”1200″ alignment=”center” border_color=”grey” img_link_large=”” img_link_target=”_self” it_animation=”fadeIn” duration=”1500″ delay=”500″ title=”Wastewater containing VOC” img_size=”509×705″][/vc_column][/vc_row][vc_row fluid=”” full_content=”” bg_cover=”” parallax=”” bg_overlay=”” overlay_opacity=”0.5″ row_padd=”no-padding”][vc_column width=”1/1″][vc_column_text]Furthermore, the first process of evaporation that the effluent is subjected to before the phase of vapor oxidation, results in concentrated organic waste that is found in the effluent. This waste can be sent to waste management or undergo a secondary phase of concentration for recovery and enhancement.
It should be noted that it is also possible to utilize the evapo-oxidation procedure with low calorific vapors as well as for the elimination of odorants.
Although evapo-oxidation is a procedure that offers very good results, it is not the only technology to treat effluents that contain VOCs. A variation of this process are stripping columns with vapor or hot air in a countercurrent in order to subsequently utilize OTR systems for the thermal oxidation of the volatiles.[/vc_column_text][/vc_column][/vc_row]