News

ID266 liquid ammonia sulphate

Thematic training material for the use of ammonium nitrate/sulphate as fertilizer has been published

May 20, 2021

Ammonium nitrate/sulphate refers to ammonium nitrate/sulphate solution recovered from stripping/evaporation + scrubbing process by nitric/sulphuric acid as scrubber. It is a liquid N (and S) fertilizer. The stripping is performed by blowing air through N-rich waste streams while increasing temperature or pH (e.g. with CaOH) which will gasify the mineral nitrogen (NH3). This is considered a pre-treatment needed before the scrubbing N recovery process where the NH3-filled air will be washed with acidified (HNO3 or H2SO4) water (scrubbing) to capture the ammonium in liquid form (ammonium sulphate from H2SO4 or ammonium nitrate from HNO3).

read more

ID1527

Thematic training material for the use of scrubber water as fertilizer has been published

May 20, 2021

Scrubber water is a N rich liquid solution recovered from waste stripping /evaporation process, mainly in the form of ammonia water. The ammonium ion in solution exists in equilibrium with unionized (free) ammonia that can volatize depending on pH and temperature. Concentrated ammonia water from stripping/evaporation process usually contains 10-15% ammonia which can be concentrated up to 20% by an extra distillation step. The product can be used directly as a fertiliser or as secondary raw product for fertiliser production.

read more

ID520 mineral concentrate

Thematic training material for the use of mineral concentrate as fertilizer has been published

May 20, 2021

Mineral concentrate is the concentrated mineral nutrients solution obtained from separation process (e.g. membrane filtration or evaporation) of waste streams that concentrates the mineral nutrients in the end-product compared to the input. Mineral concentrates predominantly consist of ammonium-nitrogen and soluble potassium. The main driver for the production of mineral concentates is to prevent transport of liquid streams with low nutrient contents or to tailor the ratios of nutrients (nitrogen, potassium and sulphur) in the fertilisers to meet the requirements of crops. Analysis across ten pilot plants in the Netherlands showed that the mineral concentrates produced from reverse osmosis (RO) concentration process contains on average 90% of the total nitrogen in the form of NH4 -N. The ingoing liquid fraction contains some organic matter which is present in mineral concentrates (1.3% organic matter or 0.6% organic carbon). Compared to pig slurry the ratio between NH4-N to Total N increased from 66% to 90%.

read more