Kulthoum Ismail

14 Questions 19 Answers 0 Followers

Questions related from Kulthoum Ismail

Why CDOM concentrations are much higher in fresh waters and estuaries than in the open ocean?

CDOM is the colored dissolved organic matter. What makes the fresh water higher in CDOM concentrations than the ocean?

06 June 2019 253 4 View

Why does ammonium concentration inhibit the growth of NOB, although it is not used as their energy source?

Ammonium is neither consumed nor produced in nitrite oxidation, how does ammonium concentration suppress NOB and why?

05 May 2017 6,168 4 View

Any brief and concise explanation of the relationship of Dirac, Kronecker delta, and Heaviside step function?

Can anyone relate these functions and explain their potential in real life applications? Thanks, Kulthoum

04 April 2017 10,058 7 View

Is the saturation constant for ammonium in the ASM3 model meant for ammonium-N or both ammonia+ammonium N ?

The half-saturation constant of ammonium in Activated sludge model #3 is given as ammonium, is it for ammonium only or both NH4 +NH3?

02 February 2017 1,513 0 View

Is the activation energy that is calculated from the observations of the maximum growth rate of microorganisms remains constant?

How the activation energy of 69,000 J/mol in the Arrhenius relation is calculated? Does this value change with temperature/ type of microorganisms/....? Any help would be greatly...

09 September 2016 2,641 1 View

Why is the yield (cell production/ammonium consumption) higher in the Annamox than in nitrification?

Both Annamox bacteria and nitrifiers are slow growers and they both grow on ammonium as their energy source, nitrification is aerobic and annamox is anaerobic , shouldn't the yield in...

11 November 2015 5,426 2 View

What is the reason for adding thiosulphate to a medium containing aerobic denitrifiers like T. Pantotropha?

if this organism could denitrify efficiently in the existence of DO, why do we need thiosulfate then ?

08 August 2015 7,810 4 View

Why nitrogen fixation and denitrification are non-reversible reactions whereas nitrification is a reversible reaction?

what are the reasons that make these two reactions irreversible while nitrification reversible?

06 June 2015 8,044 2 View

Can we consider only the kinetics of the nitrite oxidizing bacteria when modelling nitrification pathway?

Since the nitrite produced during the partial nitrification is virtually immediately further nitrified to nitrate. And the rate of conversion of ammonia to nitrite by ammonia oxidizing bacteria is...

02 February 2015 8,188 3 View

Why anammox and nitrification need additional electrons for the ammonium reaction?

These two processes are involved in the nitrogen cycle. I wonder why these two pathways need additional electrons !

02 February 2015 4,448 3 View

Can we represent a non-periodic function by a Fourier series?

Any function that is defined over the entire real line can be represented by a Fourier series if it is periodic. What if it is non-periodic?

02 February 2015 3,948 15 View

Can anyone explain briefly the difference between the equilibrium and steady state system in chemistry?

A system in a steady state means that the rate of change is Zero! what about the system which is in equilibrium?

01 January 2015 5,210 6 View

Can anyone explain briefly the difference between biomass and cell ( from the environmental perspective! Not pure biology!)?

I am getting confused, Are they the same?

01 January 2015 5,792 10 View

What are the electron acceptor and donor for nitrogen fixation pathway?

How is nitrogen gas converted to Ammonia in the wastewater treatment plant? How microorganisms act in the nitrogen fixation process (which types of bacteria)? what are the e-donors and...

01 January 2015 6,563 3 View