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Title: Novel ammonia recovery from anaerobic digestion by integrating biogas stripping and gypsum absorption

Journal Article · · Process Safety and Environmental Protection
ORCiD logo [1];  [1];  [1];  [2];  [1]
  1. Washington State University, Pullman, WA (United States)
  2. Washington State University, Pullman, WA (United States); Chinese Academy of Sciences, Xiamen (China)

Recovering ammonia from anaerobic digestion (AD) effluent offers the opportunity to produce a renewablefertilizer and reduce environmental impact. A novel process developed for such an application was evaluatedduring this study. The feature of the process is integrating biogas stripping and gypsum (CaSO4•2H2O) absorption. The result revealed that the lower CO2 content and the absorption temperature contributed the higherefficiency of ammonia recovery. The gypsum solution recovered around 95% of the stripped ammonia when thestripping gas contained 10% CO2 and it rose to 100% when the gas contained more than 30% CO2. Furthermore,a statistical model and genetic algorithm were applied to estimate the total ammonia recovery and optimize theoperating parameters. The experimental and modeling results indicated that integrating biogas stripping withgypsum absorption can effectively harvest ammonia nitrogen and reduce CO2 emissions while producing(NH4)2SO4 fertilizer from AD effluent.

Research Organization:
Washington State Univ., Pullman, WA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Bioenergy Technologies Office (BETO); Agriculture and Food Research Initiative Competitive; USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0008808; 2022–67019-36486; DE‐EE0008808/0001
OSTI ID:
2478866
Alternate ID(s):
OSTI ID: 2007686
Journal Information:
Process Safety and Environmental Protection, Vol. 180; ISSN 0957-5820
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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