A PROCESS FOR THE PURIFICATION OF FACTORY WASTES OF PIGMENTS CONTAINING RICH NITROGEN ELEMENT

摘要

PURPOSE: A treatment system for pigment wastewater is provided, which is characterized in that the system treats efficiently wastewater containing large quantities of nitrogen by using chlorine gas. CONSTITUTION: A treatment system for pigment wastewater is composed of four steps such as follows: (i) a first treatment step neutralizing pigment wastewater containing large quantities of nitrogen by using acid and alkali and removing sludge by using flocculation and compressed-air flotation; (ii) a second treatment step settling Cu ion by injecting settling agents and coagulants; (iii) a third treatment step treating the wastewater in an aerobic reactor by using activated sludge; and (iv) a forth treatment step withdrawing nitrogen gas by adding chlorine gas and neutralizing and oxidizing finally organic matter.