Traditional methods, including air striping [4], reverse osmosis
[5], chemical precipitation [6], break-point chlorination [7], ion exchange
[8], and biological nitrification [9] etc., have been used to
remove ammonium nitrogen from industrial wastewater. Strict
operating conditions and high cost for physical and chemical methods,
long periods and bad impact from shock loads and unacceptable
peaks of ammonia on bacteria for biological methods make
them unpromising to use in practical industrial applications [10].