Efficient Recovery of Highly Concentrated Ammonia Nitrogen from Vanadium-extraction Wastewater with MAP Method

doi:10.12068/j.issn.1005-3026.2021.06.005

Abstract

Abstract: In order to realize the efficient recovery of ammonia nitrogen from vanadium-extraction wastewater， influencing factors including phosphorus source， magnesium source， pH value， reaction time and the molar ratio of n(Mg)∶n(N)∶n(P) were investigated. The Box-Behnken response surface method was then used to optimize the modeling and XRD was used to analyze the products. The results indicated that MgCl₂·6H₂O and Na₂HPO₄·12H₂O were used as the most suitable source of magnesium and phosphorus， and the best precipitation time was 20min. The polynomial regression equation obtained with the Box-Behnken response surface method showed that the influence degree of each factor on the ammonia recovery percent was n(Mg)∶n(N)＞n(P)∶n(N)＞pH. The confirmatory experiment was carried out around the optimal conditions， and pH， n(Mg)∶n(N) and n(P)∶n(N) were 9.51， 1.22 and 1.12， respectively. The recovery percent of ammonia nitrogen was 98.32%， and the effect of model optimization was obvious. In summary， the optimization of MAP with the response surface method for the high-efficiency recovery of ammonia nitrogen in vanadium extraction wastewater is of great significance， especially for the efficient resource utilization of high ammonia-nitrogen wastewater in the expanded vanadium-extraction industry.

Key words: MAP crystallization method; response surface; vanadium-extraction wastewater; ammonia-nitrogen wastewater; resource recovery

CLC Number:

X756

ZHOU Su-ying， DING Xue-yong， XUE Xiang-xin， YANG He. Efficient Recovery of Highly Concentrated Ammonia Nitrogen from Vanadium-extraction Wastewater with MAP Method[J]. Journal of Northeastern University(Natural Science), 2021, 42(6): 789-794.

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