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List the five types of nitrogen.
Ammonium, Ammonia, Nitrite, Nitrate and Organic-N.
List seven nitrogen removal mechanisms.
Biological nitrification, biological denitrification, living systems, land application, ammonia stripping, breakpoint chlorination and ion exchange.
Climates with large temperature variations can have a significant impact on denitrification. For example, the denitrification reactor volume at 10 °C would be about four times the volume required at 20 °C to achieve the same degree of nitrification. Why do you think this is the case?
T1 = 20 degrees C
T2 = 10 degrees C
P = 0.25T2
P2 0.25(T2)2 0.25(10)2 25
= = = = 1/4
P1 0.25(T1)2 0.25(20)2 100
The denitrification rate at 10 degrees C is only 1/4 the rate at 20 degrees C and would, therefore, require 4 times the reactor volume to achieve the same degree of treatment.
MCRT is the abbreviation for ________.
MCRT is the abbreviation for Mean Cell Residence Time .
The two types of aeration systems used in nitrification processes are ______ and ______.
The two types of aeration systems used in nitrification processes are surface aerators and diffusers.
The optimal pH range for biological nitrification is _____ to _____.
The optimal pH range for biological nitrification is 7.8 to 8.2 .
Nitrification in the winter months may require up to five times the detention time used during the summer.
a. True b. False
a. True
Single stage biological nitrification typically requires a MCRT of ___ to ___ days
Single stage biological nitrification typically requires a MCRT of 8 to 20 days
For biological nitrification to proceed efficiently, there must be an adequate supply of carbon, nitrogen, and phosphorous in the wastewater. If the phosphorus level is too low, it may be remedied by adding a phosphate fertilizer to the aeration tank.
In a denitrification process, it may be necessary to add a carbon source such as methanol if the total effluent nitrogen limit is less than ___mg/L.
In a denitrification process, it may be necessary to add a carbon source such as methanol if the total effluent nitrogen limit is less than 7.5 mg/L.
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