scholarly journals Green chemistry of nutrient recovery: From mechanochemistry to reduced nitrogen loss

2020 ◽  
Author(s):  
Jonas Baltrusaitis
Keyword(s):  
Green Chemistry ◽  
Nitrogen Loss ◽  
Nutrient Recovery ◽  
Reduced Nitrogen

Sawdust biochar application to rice paddy field: reduced nitrogen loss in floodwater accompanied with increased NH3 volatilization

2018 ◽  
Vol 25 (9) ◽  
pp. 8388-8395 ◽  
Author(s):  
Yanfang Feng ◽  
Haijun Sun ◽  
Lihong Xue ◽  
Yueman Wang ◽  
Linzhang Yang ◽  
...  
Keyword(s):  
Paddy Field ◽  
Nitrogen Loss ◽  
Rice Paddy ◽  
Nh3 Volatilization ◽  
Rice Paddy Field ◽  
Reduced Nitrogen

scholarly journals Nutrient recovery from anaerobically digested organic wastes

2007 ◽  
pp. 97-107
Author(s):  
Deshai Botheju ◽  
Oystein Svalheim ◽  
Bjorn Rydtun ◽  
Jo-Ela Johansen ◽  
Rune Bakke
Keyword(s):  
Liquid Fraction ◽  
Nitrogen Loss ◽  
Organic Fertilizer ◽  
Significant Loss ◽  
Organic Wastes ◽  
Nutrient Recovery ◽  
Nitrite Accumulation ◽  
Evaporative Concentration ◽  
Ammonium N ◽  
Soil Enhancement

Effluents (digestates) resulting from anaerobic digestion of wet organic wastes can berecycled as fertilizers. Separation of such digestates into a wet and a dry fraction is common.The solid fraction is often sold as a soil enhancement product while the liquid fraction isusually discarded as wastewater. A large portion of the digestate nutrients is dissolved as ionsin the liquid. The aim of this study is to establish an efficient way to convert this into a liquid"organic fertilizer". Enhancement of the nutrient concentration is necessary in order to makethe final product commercially acceptable. Direct evaporative concentration is not suitable asit would lead to a significant loss of ammonia due to the fact that most of the availablenitrogen in these digestates is present in the ammonium/ammonia form. Thus stabilizing theproduct by partial nitrification prior to evaporation is proposed based on a series ofexperiments conducted to evaluate the appropriateness of this approach.The ammonium-N concentration of the digestate used was 1.7 g/L. The nitrification does notappear to be inhibited by ammonia, nitrate or nitrite accumulation, except when pH > 7.5, asituation that can be avoided by regulating the feeding rate based on pH measurements.Significant nitrite accumulation was not observed either. Nitrification is however consistentlylimited by alkalinity so that only about 75% of the ammonia can be converted to nitratewithout alkalinity supplementation. The nitrification brings the pH down below 5.0 where theremaining ammonia is present as> 99% NH/. At this condition the nitrified digestate can beevaporated without a significant nitrogen loss and the product is recognized to be a highquality liquid fertilizer. It is suggested that the production of concentrated partially nitrifiedorganic fertilizers can become a sustainable way of nutrient recovery from anaerobicdigestates originating from municipal organic wastes.

Arbuscular Mycorrhiza Reduced Nitrogen Loss via Runoff, Leaching, and Emission of N2O and NH3 from Microcosms of Paddy Fields

2021 ◽  
Vol 233 (1) ◽  
Author(s):  
Shujuan Zhang ◽  
Wenfei Yun ◽  
Yu Xia ◽  
Sikai Wu ◽  
Zhaoyang You ◽  
...  
Keyword(s):  
Arbuscular Mycorrhiza ◽  
Nitrogen Loss ◽  
Paddy Fields ◽  
Reduced Nitrogen
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