Ammonia Stripper NAS - conferences.aquaenviro.co.uk · • Nijhuis Water Technology: Global...
Transcript of Ammonia Stripper NAS - conferences.aquaenviro.co.uk · • Nijhuis Water Technology: Global...
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Ammonia Stripper NAS
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• Nijhuis and H2OK formed joint venture to provide the UK market with a true single source supply.
• Collaboration between two companies working together as one with shared vision of quality, customer service, reliability, value, on going support.
• H2OK Water and Energy: Wastewater treatment, waste to energy with a design, build and operate capability.
• Nijhuis Water Technology: Global provider in the design manufacture and construction of innovative value from waste, wastewater and recycling solutions, active in 50 countries
• Global presence with over 2400 reference sites
• National presence with over 160 sites in the UK
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• Nijhuis and H2OK formed joint venture to provide the UK market with a true single source supply.
• Collaboration between two companies working together as one with shared vision of quality, customer service, reliability, value, on going support.
• H2OK Water and Energy: Wastewater treatment, waste to energy with a design, build and operate capability.
• Nijhuis Water Technology: Global provider in the design manufacture and construction of innovative value from waste, wastewater and recycling solutions, active in 50 countries
• Global presence with over 2400 reference sites
• National presence with over 160 sites in the UK
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Global network & 2400 references
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Water Treatment l Recycling l Waste to Valuable
Phosphorus
Nitrogen
Oil
Fats
Starch Waste water Proteins Waste
Manure
Realizing the value of waste & water
Heat
Energy Biofuels
Animal feed
Ingredients Process water Fertilizers
Algea
Green gas
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Ammonia stripping
• High ammonia levels are toxic to both aerobic and anaerobic
biological processes.
• The Nijhuis Ammonia Stripper or NAS is a process to convert
Ammonia into Ammonium sulphate ((NH4)2SO4) solution.
• This solution is an effective nutrient with market value.
• The NAS is designed to recover this nutrient from liquids like
digestate or slurries.
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Nitrogen removal from digester feed, digestate or manure
Ammonium sulphate can be sold as a fertilizer
Process steps
• Stripping of liquid with gas @ 60-
80 °C
• Gas scrubbing with sulphuric acid
• Ammonium sulphate is formed in
scrubber column
NAS – Ammonia stripping and ammonium sulfate
production
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Stripper
• The substrate in the stripping tank is adjusted to optimal
conditions
• 60 to 80 degrees °C
• pH 8 – 9, in order to strip the ammonia from the
substrate
• Residence time is typically 10 – 20 h.
• Gas is circulated through the substrate in the stripping tank
and will transport ammonia from the stripper tank to the
scrubber column.
• Heating takes place into two steps:
• Heat exchanging from effluent to influent in order to
recover energy.
• Final heating with steam or other available heat
source.
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Scrubber
• The gas containing Ammonia is washed
in scrubber column with sulphuric acid.
Ammonia and Sulphuric acid are
converted into an Ammonium sulphate
((NH4)2SO4) solution.
• Removal efficiency is 98 – 98 %.
• Carrier gas free from Ammonia is reused
in the Stripping tank.
• Alternative to Sulphuric acid Nitric acid or
Phosphoric acid can be used in order to
produce other nutrients.
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NAS – Ammonia stripping and ammonium sulfate
production
Applications (Installed before anaerobic processes)
• Reduce Nitrogen levels and toxicity in the anaerobic
treatment
• Hydrolysing of COD
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NAS – Ammonia stripping and ammonium sulfate production
Applications (Installed after anaerobic processes)
• Create maximum output
• Prevent toxicity in the aerobic stage following the NAS
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Ammonia stripper Laboratory trials
Laboratory scale tests have been
performed together with the Agricultural
University of Wageningen, WUR.
Batch testing was executed in order to
study removal kinetics.
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Removal Kinetics
• Removal of NH3 from digestate at pH 8,5 at 80 C
• Gas is bubbling through the liquid
0
20
40
60
80
0 5 10 15 20 25
Re
mo
val e
ffic
ien
cy [
%]
Time [h]
Digestate
tN removal [%]
NH3 reduction [%]
Poly. (NH3 reduction [%])
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• Pilot trials have undertaken automatically
with digestate feedstock
• The pilot was used to prove the
experimental lab scale experiments in a
continuous process.
Ammonia stripper Pilot trials
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NAS - Ammonia stripping and ammonium sulphate production
General Arrangement Contact and de-foaming
column
Gas scrubber
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• Currently under construction
building the NAS Fertilizer
Production Plant FPP for
treatment of digestate prior to
aerobic treatment at Bernard
Matthews Holton site.
• Treatment is required in order to
prevent Nitrogen problems in the
excising wastewater treatment
plant.
Application of the Nijhuis Ammonia Stripper
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• The plant is built as a containerized unit
with a separate concrete stripper tank.
• Stripper tank, scrubber column are
located outside.
• All other equipment is located inside.
Fertilizer Production Plant at Bernard
Matthews’ Holton Site
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Questions?
www.nijhuis-water.com
www.h2ok.co.uk