Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 27    No. 2    February 2017

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Two-sectional struvite formation process for enhanced treatment of copper-ammonia complex wastewater
Li-yuan CHAI1,2, Cong PENG1,2, Xiao-bo MIN1,2, Chong-jian TANG1,2, Yu-xia SONG1,2, Yang ZHANG1,2, Jing ZHANG1,2, Mohammad ALI1,2

1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Chinese National Engineering Research Centre for Control and Treatment of Heavy Metal Pollution,
Central South University, Changsha 410083, China

Abstract:Mg2+ and PO43+ were added into the synthetic wastewater, leading to the dissociation of the complex ions in the wastewater, and resulting in removal of copper and ammonia therein. The effects of agents addition amount, pH, and reaction time on the removal efficiency of copper and ammonia were investigated. In particular, two-sectional struvite formation (TSSF) process was established for copper and ammonia removal. MgCl2 and Na2HPO4 were added by following 90% addition in the first section and remained 10% in the second during the TSSF process. Compared with one sectional struvite formation, TSSF possessed much better performance. Under condition of n(NH3-N):n(Mg):n(P)=1:1.2:1.5 (molar ratio), pH=9, and reaction time of 30 min, the removal efficiencies of copper and ammonia were 98.9% and 99.96%, respectively. The enhanced performance of TSSF is explained by the competition of ammonia by copper-ammonia complexes and struvite. The dissociation of copper-ammonia complexes is further demonstrated by thermodynamic equilibrium analysis, on the basis of calculations and establishment of predominance phases diagram. Moreover, XRD and EDS analyses further confirmed the formation of struvite and precipitation of copper, which prove the transmission of copper and ammonia from liquid phase into solid phase.


Key words: struvite; copper-ammonia complex; ammonia removal; heavy metal wastewater; precipitation

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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