SPX Cooling Technologies MXF 3000, MCR3100, MXF 4800, MXF 7400 manual Nitrification

									Applications
			BOD<15		Nitrification				Nitrification
			SS<15
			NH N<1
			4						In the nitrification process (Fig. 9-1) MARPAK
Effluent from		BOD-30
									MXF Series fixed film reactor provides an
Secondary
		SS-20
Treatment									effective means of oxidizing ammonia nitrogen of
		NH N-25			MARPAK
		4
				Nitrification					secondary treated wastewater.
					Reactor
							9-1		Nitrifying trickling filters require less mechanical
									equipment, less operating power and less
			12000						attention than the activated sludge process
									(Fig. 9-3). Nitrifying trickling filters are less
			10000						effected by cold temperature than the
									activated sludge process (Fig. 9-4).
		Media	8000						MARPAK nitrification fixed film reactor,
									when preceded by clarified secondary
	Surface		6000			7° To 11°C
									effluent with the BOD5 below 35 mg/l, will
		Area
Required			4000			12° To 19°C			continue to reduce suspended solids and
sq ft/lb of									BOD5 to a level below 20 mg/l.
		NH+4-N	2000						A performance curve for nitrification is
Oxidized
	Per Day		0						shown in Fig. 9-2.
			1.0	2.0	3.0	4.0	5.0	6.0
			Effluent Ammonia-N (mg/L)					9-2
			Source: Process Design Manual For Nitrogen Control, U.S. EPA

Cost Comparison
	Activated	Nitrifying
Cost	Sludge	Trickling Filter
Project	$ 8,497,000	$ 4,870,000
Energy (10 year)	3,450,000	1,175,000
Project - present worth	7,423,000	4,250,000
Energy - present worth	2,847,000	971,000
Total - present worth	$10,270,000	$ 5,221,000
Source: Water Engineering and Management			9-3

Effect of Temperature
100		Trickling		Filter
Nitrifying
80
Nitrification
Rate 60			Sludge
(as % of rate
	Activated
at 20°C) 40
20
0
10	12		14		16	18	20
	Temperature °C						9-4

Source: Water Engineering and Management