Selva Selvarajah

5 Questions 130 Answers 0 Followers

Questions related from Selva Selvarajah

Should dissolved organic-N (DON) in river, stream and lakes be monitored as routine trophic N-index in addition to nitrate, ammoniacal-N and total-N?

Nitrogen contamination of the surface water (lake, river and stream) is monitored routinely as nitrate-N, ammoniacal-N (both of the above combined as dissolved inorganic-N) and total-N. The above...

15 June 2020 1,773 0 View

Has the loss of high class soils to urban sprawl been a threat to food production in your country? If so which measures have been taken?

Increasing population demands housing which in turn requires new land to build houses and infrastructure. Often, the casualty has been productive lands that are capable of producing food. Of...

30 April 2018 9,898 7 View

Wasetwater from TF treating only domestic wastewater requires further treatment to reduce NH4. Would aerating without RAS trigger good nitrification?

A current modern trickling filter (TF) system with plastic filters has an input of BOD = 200 mg/L, COD = 350 mg/L and TN = 45 mg/L (effluent volume being 15,000 m3/d) has an output (in mg/L) of...

14 May 2017 8,048 23 View

Is the use of nitrification inhibitors to reduce nitrate leaching from soils being monitored or regulated in your country? If so why and how?

Nitrification inhibitors have been researched extensively for more than 5-6 decades. If used properly, NO3 leaching and greenhouse gas emission such as N2O from soils can be minimised in...

09 April 2015 4,675 14 View

Is there sufficient evidence for NO3 to be immobilised in soil?

Ammonium (NH4) is immobilised by soil bacteria which is a common pathway in N cycle. Nitrate (NO3) is reduced to N2O or N2 via denitrification process. Sometimes NO3 can be reduced through...

22 January 2015 2,141 9 View