How do you calculate nitrogenous oxygen demand?
How do you calculate nitrogenous oxygen demand?
We can calculate by following steps:
- Write balanced reaction for the carbonaceous oxygen demand. CH2(NH2)COOH + 1.5O2 → NH3 + 2CO2 + H2O.
- Write balanced reactions for the nitrogenous oxygen demand. NH3 + 1.5O2 → HNO2 + H2O. HNO2 + 0.5O2 → HNO3
- Determine the ThOD. ThOD = (1.5 + 2) mol O2/mol glycine.
What is nitrogen oxygen demand?
Nitrogenous oxygen demand (NOD) is a quantitative measure of the amount of dissolved oxygen required for the biological oxidation of nitrogenous material, for example, nitrogen in ammonia, and organic nitrogen in waste water.
What is good biological oxygen demand?
Typical values. Most pristine rivers will have a 5-day carbonaceous BOD below 1 mg/L. Moderately polluted rivers may have a BOD value in the range of 2 to 8 mg/L. Rivers may be considered severely polluted when BOD values exceed 8 mg/L.
What is the difference between BOD and BOD5?
BOD technically stands for Biological Oxygen Demand BOD5 means the test has been run for 5 days. C-BOD means only the Carbonaceous Biochemical Oxygen Demand N-BOD means Nitrogenous Biochemical Oxygen Demand BOD5 typically includes C-BOD and N-BOD unless one or the other is inhibited.
What is the difference between ThOD and cod?
COD/TOC = 32/12 = 2.66 ThOD (Theoretical oxygen demand): COD (Chemical oxygen demand): It is the amount of oxygen required for the decomposition of both biodegradable & non-biodegradable organic matter present in the system.
What are the various oxygen demands?
Biochemical oxygen demand (BOD), the amount of oxygen needed by organisms to break down organic material present in a water sample. Carbonaceous biochemical oxygen demand (CBOD), the amount of oxygen needed to break down carbon compounds, excluding nitrogen compounds.
What are the limitations of BOD test?
Limitations Of Test The method takes five days to perform and uses a discrete sample. The test has poor reproducibility and toxic chemicals can inhibit measurement. Short-term BOD determinations magnify errors and still require relatively long sample periods. The test is not suited for on-line, continuous measurement.
Which is higher COD or BOD?
COD is normally higher than BOD because more organic compounds can be chemically oxidised than biologically oxidised. This includes chemicals toxic to biological life, which can make COD tests very useful when testing industrial sewage as they will not be captured by BOD testing.
Does BOD include ammonia?
N-BOD means Nitrogenous Biochemical Oxygen Demand – All forms of ‘reactive nitrogen’ in urine and proteins (urea, uric acids, ammonia, amino acids, nitrates) are nutrients for algae and aquatic plant growth. This phenomenon is called N-BOD or Nitrogenous Biochemical Oxygen Demand.
