Every tonne of ammonia that OTAR® recovers before it reaches the biological treatment system is a tonne the plant no longer needs to nitrify and denitrify. The energy saving from avoided aeration is typically 3–8 kWh per kg of nitrogen removed.

At indicative Australian industrial electricity prices (approximately AUD $0.20–0.35/kWh), this generates a saving of roughly AUD $0.70–2.70 per kg N — in practice, that’s AUD $700–2,700 per tonne of nitrogen diverted from BNR. Associated savings in carbon dosing, alkalinity supplement and sludge disposal add further.

For OTAR®’s Variant 4 (heat recycling), the system’s coefficient of performance exceeds 15. Therefore, the electrical energy needed to drive stripping is far smaller than the treatment cost it avoids.

Recovered ammonium hydroxide (Variant 2) or ammonium sulphate (Variant 3) generates a direct revenue stream. For Variant 2, standard-grade ammonium hydroxide solution typically achieves AUD $290–530 per tonne in established markets. OMRI-certified (or equivalent Australian organic input certified) product commands a premium above this range.

For a system recovering 90 tonnes of nitrogen per year as ammonium hydroxide, net product revenue typically contributes AUD $75,000–170,000 per annum, depending on product grade and offtake terms. In some cases, the product even replaces purchased inputs within the same facility — for example, one chemical plant reduced ammonium hydroxide purchases by nearly a third, a directly measurable saving.

Diverting ammonia from the main treatment stream before it enters BNR frequently unlocks latent treatment capacity. As a result, facilities can accept higher loads or additional feedstocks without capital investment in new infrastructure.

In addition, OTAR®’s physico-chemical process (unlike BNR) resists inhibitors, temperature fluctuations and biomass instability. Consequently, it delivers more reliable consent compliance, which matters most for facilities with tight discharge limits or sites in sensitive catchments under state EPA nutrient discharge policy.

Intensive agribusiness operators (poultry, piggery, dairy) typically see the strongest product-revenue value stream, since recovered fertiliser can be reused on-farm or sold through a local cooperative rather than trucked off-site. 

Industrial food & beverage processors (red meat, dairy, brewing) tend to weight value stream 1 most heavily, since avoided trade waste surcharges and BNR operating costs compound with production volume.

Municipal & private landfill asset managers generally lean on value stream 3, since consistent, shock-resistant TAN removal protects compliance against decades of persistent leachate ammonia, even where product offtake is limited.

OTAR is a modular platform with over 20 years of operational experience and proven installations in Asia. For operators currently spending on biological nitrogen removal, the most commercially attractive configuration is Variant 2. Which is the water absorption that converts a treatment cost into ammonium hydroxide revenue with no acid supply chain, no salt production and no hazardous chemical handling. Where waste heat is unavailable, Variant 4’s heat recycling system achieves a coefficient of performance exceeding 15, making thermal stripping viable even from cold electricity.