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JINGYU Environmental Engineering

Short-Cut N Removal

Short-Cut Nitrogen Removal: Less Air, Less Carbon, Same Limit
SHORT-CUT N/D · SHORT-CUT NITROGEN REMOVAL

The same nitrogen, removed by a shorter road

Short-cut nitrogen removal takes the reaction to nitrite and turns back, instead of going on to nitrate and returning. The nitrogen leaves either way. One route simply costs less air and less carbon.

Send us your nitrogen figures See how it works
PatentedZL 2014 2 0469160.6
Less airAeration demand falls
Less carbonExternal dosing falls with it
Same limitDischarge compliance unchanged
01Definition

What is short-cut nitrogen removal?

Short-cut nitrogen removal, or short-cut nitrification and denitrification, is biological nitrogen removal that stops the oxidation at nitrite rather than carrying it through to nitrate.

Denitrification then starts from nitrite. The nitrogen leaves the water as gas exactly as it would on the conventional route, but two of the steps are skipped.

Those two steps are where a conventional plant spends its aeration power and its dosed carbon. That is why the shorter path shows up directly on the operating bill.

02The cost

Two steps you paid for and did not need

Oxidising nitrite to nitrate, then reducing it straight back, costs air on the way up and carbon on the way down.

Conventional biological nitrogen removal oxidises ammonia to nitrite, then nitrite to nitrate, then reduces nitrate back through nitrite to nitrogen gas. The middle pair of steps cancel each other out. They still have to be paid for.

Air on the way upOxidising nitrite to nitrate consumes oxygen the plant has to blow in, continuously.
Carbon on the way downReducing that nitrate back again consumes organic carbon. On many waters, that carbon has to be bought and dosed.
Sludge at the endEvery kilogram of dosed carbon returns as biomass, which has to be handled and disposed of.

Stopping at nitrite removes both halves of that round trip. Less air, less carbon, less sludge, and the same discharge limit met.

03The principle

Where it sits and what it leaves behind

Short-cut nitrification and denitrification runs inside the biological stage, upstream of the membranes. It carries the bulk of the nitrogen load, so the polishing stage downstream has far less to remove.

That division of labour matters on leachate in particular. Nanofiltration passes nitrate and holds back the carbon. Whatever nitrogen survives the biology is then handled by advanced nitrogen removal, in water with nothing left to drive it.

Patent ZL 2014 2 0469160.6  ·  Short-cut nitrification and denitrification technology
2 Reaction steps removed

Nitrite to nitrate on the way up, and nitrate to nitrite on the way down. Both are skipped, and both were being paid for.

The saving is not a percentage improvement in a unit. It is a pair of reactions that no longer happen.

Short-cut nitrification and denitrification Biological treatment NF Bac-FerM™ advanced N removal Compliant discharge RO Compliant discharge RO concentrate treatment unit Water recovery route Nitrogen removal route
Short-cut nitrification and denitrification sits with the biological stage, ahead of nanofiltration. It removes the bulk of the nitrogen, so the polishing stage after the membranes has far less to do.
05Applications

Where it is applied

Landfill and waste-to-energy leachate

High ammonia with limited carbon. The dosing bill for conventional denitrification is a permanent operating line.

High-ammonia industrial effluent

Streams where nitrogen rather than COD sets the aeration demand of the plant.

Plants short of aeration capacity

Sites whose blowers are already at their limit. Reducing oxygen demand is cheaper than installing more of it.

Short-cut N/D and Bac-FerM advanced nitrogen removal are designed as a pair. The first carries the load, the second holds the limit.

06Questions

Frequently asked questions

What is short-cut nitrogen removal?

It is biological nitrogen removal that stops nitrification at nitrite rather than taking it to nitrate, then denitrifies from nitrite. Two reaction steps are skipped, and the nitrogen still leaves as gas.

How much does it save?

The saving comes from two places. The oxygen that would have oxidised nitrite to nitrate, and the carbon that would have reduced that nitrate back. Both are continuous operating costs, so the effect lands on the running bill.

Is the effluent quality the same?

Yes. The discharge limit is met on either route. What changes is the air and carbon consumed to meet it.

Why is it harder than it sounds?

Because the reaction naturally wants to continue to nitrate. Holding it at nitrite requires deliberate control of the process conditions, which is what the patented process does.

Is it patented?

Yes, under Chinese patent ZL 2014 2 0469160.6.

Does it replace advanced nitrogen removal?

No, they work together. Short-cut N/D removes the bulk of the nitrogen in the biological stage. Advanced nitrogen removal polishes what survives the membranes, where no carbon is left to work with.

Send us your nitrogen figures

Start here

If your plant doses carbon and runs its blowers hard to hold a nitrogen limit, both numbers are worth re-examining. Send the figures and we will tell you what the shorter route would change.

Discuss your water challenge

Useful to include

  • Flow and ammonia concentration
  • COD available in the biological stage
  • Carbon source and current dose rate
  • Aeration capacity installed, and how close to it you run
  • The discharge limit you have to hold

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