Pretreatment of High Concentration Phosphorus-Containing Wastewater

Experimental wastewater generated in the process of preparation catalyst for the production of acrylamide, it containing a large number of sub-phosphate, sulfate. As a starting point to reduce total phosphorus concentration (TP = 2300mg/L), determine conditions to examine such as the best precipitant agent and its dosage, reaction pH, temperature and other single-factor conditions. After extensive tests confirmed, 100ml of this phosphorus-containing wastewater was adjusted to pH 8, at 30 °C, 3.0g of calcium chloride was added, reaction 180min, total phosphorus concentration can be reduced to 200mg/L or less, phosphorus removal rate can reach 91%. XRD, TG-DTA characterization analysis showed that the main component of chemical deposits were calcium phosphate and calcium sulfate crystals