Leachate treatment by denitrification is a process which is carried out in biological aeration treatment of leachate. By definition, it can only take place after nitrification, and the purpose of denitrification is to convert nitrate in solution, which is produced during the preceding nitrification stage, to nitrogen and water. The beauty of this reaction is that these by-products are harmless when discharged into the environment.

It is a wonderful way to return nitrogen, which would otherwise be at risk of polluting the environment, back into the atmosphere which already comprises large quantities of nitrogen, harmlessly

O.K. Here we go! On the one hand, there is Pro; In Favor:

The first point in support of leachate treatment denitrification is going to be that as already hinted, this is a very clean and sustainable biological reaction. it is one of the very few reactions which a water treatment plant process designer can use without there being any by-products which might then go on to give unwanted side-effects or need costly disposal.

A second point in favor could well be that leachate treatment denitrification as a stage of treatment after biological aeration (nitrification) treatment will enable the nitrification reaction effluent, which would otherwise be unsuitable for a watercourse discharge, to be discharged safely.

The 3rd positive point is that low rate denitrification can usually be achieved within an SBR process by adding an additional anoxic stage to the cycle of operation of the plant, in conjunction with suitable nutrient chemical addition in the cycle.

A fourth big benefit is that some reduction in the concentration of a number of other contaminants will occur a the same time.

Lastly, the 5th point is the effluent is far less likely to cause algal blooms in dowstream waters.

And on the reverse side, for balance, the Con side, against:

The primary point against leachate treatment denitrification is costly.

The 2nd point against is going to be it requires the expenditure of additional energy.

3rd point against is going to be it requires the addition of additional dosing chemicals.

Your fourth point against is the process requires careful control to achieve the desired effects.

5th and ultimately, last point in contra is going to be the benefits of nitrogen removal may not be enough to warrant the expenditure of the money it costs.

That is it, the good qualities as well as the cons, the points in favor and the points against.

Finally then, what's the "bottom line" here? Is leachate treatment denitrification ) good or bad?

Both questions seem to have a "yes" answer! leachate treatment denitrification is a mixture of good and bad which shall on occasions be the best leachate treatment option... It is left up to you, the reader to decide which side, the good or the bad, outweighs the other one...