Question

How can nitrification process be included in an intermittent decanted extended aeration method of wasre water treatmment

Answer 1

The nitrification process can be included in an intermittent decanted extended aeration method of waste water treatment because -

The intermittent decanted extended aeration (IDEA) is a process in which an aeration period, settling period and decanting period are successively repeated in a single reactor.

In IDEA ,the influent wastewater is transversely supplied at the bottom of the reactor and slowly diffused in the reactor while treated wastewater which is intermittently discharged during the decanting period is provided.

In IDEA, the wastewater can be efficiently treated without by-pass of wastewater under dry weather and wet weather conditions as well as stormy weather condition.

The present invention relates to a process for wastewater treatment in order to remove nitrogen and phosphorus as well as organic substances from wastewater.

Nitrification is a biological conversion of ammonium to nitrate nitrogen and it is a two step process.

In the first step, the aerobic bacteria known as nitrosomonas convert ammonium to nitrite.

But in case of second step another group of aerobic bacteria called nitrobacter finish the conversion of nitrite to nitrate.

The nitrogen can cause problems like sludge formation, Ashing, Foam or scum formation, nitrite lock in waste water treatment plant.

The extended aeration process combines trickling film and extended aeration biological treatment strategies to quickly consume nitrogen and phosphorus as highly efficient unit.

Aeration helps in producing noxious odours, making the extended aeration process completely suitable its operation .

Finally the waste is then pumped to the top of the filter and allowed to trickle over the packing media where bacterial growth removes waste products.

In past, wastewater treatment plants generally aimed at the removal of organic substances and suspended solids in wastewater.

Accordingly to conventional wastewater treatment, many inorganic nutrients such as nitrogen and phosphorus were not removed and finally discharged into lakes and marshes.

This leads to eutrophication of lakes and marshes which makes difficult to provide clean water resources and preserve the ecological system.

As a result of which cost of wastewater treatment increased and nowadays advanced treatment for purifying wastewater is adopted.

Nowadays conventional process for wastewater treatment like IDEA uses a cycle process of nitrification and denitrification by microorganism for removal of nitrogen from waste water treatment plants.