煤气化废水中有机物对磷酸铵镁结晶法去除氨氮的影响

Lab?scale batch experiments were carried out to investigate the effects of heterocyclic and phenolic compounds on the ammonia nitroger removal by magnesium ammonium phosphate ( MAP ) crystallization. The morphology of the precipitates obtained was observed with microscope, and the concentration of heterocyclic and phenolic compounds was analyzed by HPLC. The results show that heterocyclic and phenolic compounds suppressed ammonium nitrogen removal by MAP crystallization. With the addition of pyridine, quinoline, m?cresol, dimethylphenol and phenol, the residual ammonium nitrogen increased by 45. 17, 56. 66, 43. 01, 50. 68 mg·L-1 and 49?72 mg·L-1 , respectively. The suppression of heterocyclic compounds was more significant than that of phenolic compounds. Because of complexation and adsorption, the suppression of multi?componet system is stronger than that of single?componet one on ammonium removal in MAP crystallization.