Biochar amendment and Calamagrostis angustifolia planting affect sources and production pathways of N2O in agricultural ditch systems

2019 ◽  
Vol 21 (4) ◽  
pp. 727-737
Author(s):  
Qianding Cheng ◽  
Hongguang Cheng ◽  
Zhenzhen Wu ◽  
Xiao Pu ◽  
Lu Lu ◽  
...  
Keyword(s):  
Nitrification And Denitrification ◽  
Calamagrostis Angustifolia ◽  
Biochar Amendment

Biochar amendment and Calamagrostis angustifolia planting affect N2O emissions derived from nitrification and denitrification pathways in agricultural ditch systems.

Variable responses of nitrification and denitrification in a paddy soil to long-term biochar amendment and short-term biochar addition

Chemosphere ◽  
2019 ◽  
Vol 234 ◽  
pp. 558-567 ◽  
Author(s):  
Lili He ◽  
Jun Shan ◽  
Xu Zhao ◽  
Shenqiang Wang ◽  
Xiaoyuan Yan
Keyword(s):  
Paddy Soil ◽  
Short Term ◽  
Nitrification And Denitrification ◽  
Biochar Amendment

Process evaluation of HASP with IMET system through SNR and SDNR for the efficient management of Sewage Treatment Plant

2008 ◽  
Vol 3 (1) ◽  
Author(s):  
Young H. Yoon ◽  
Jae R. Park ◽  
Sang W. Ahn ◽  
Kwang B. Ko ◽  
Kyung J. Min ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Linear Regression Analysis ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Reaction Rates ◽  
Nitrification Rate ◽  
Activated Sludge Process ◽  
Type Experiment ◽  
Batch Type ◽  
Nitrification And Denitrification

Hybrid Activated Sludge Process (HASP) with IMET was developed and applied to an activated sludge process for the advanced nutrient treatment in Korea. The characteristics of nitrogen removal from the HASP were investigated through a kinetic study by batch-type experiment. Online DB analysis produced from the IMET was conducted for the nutrient removal performance in the field demonstration plant treating 10,000 m3/day in G city of Korea. In this paper, we aimed to determine the effect of increasing NHM4+-N load on the specific nitrification rate (SNR) and the specific denitrification rate (SDNR) through a batch-type experiment, and to estimate the net reaction time for the phase-transfer rate using online DB analysis in the HASP operation. Experimental results include: (1) both the nitrification and denitrification followed first-order kinetics; (2) the maximum SNR and SDNR were 4.0301 mgN/gVSS·hr and 2.785 mgN/gVSS·hr, respectively; (3) comparison of reaction rates between nitrification and denitrification from the non-linear regression analysis found that nitrification rate was higher than denitrification.

Theoretical and practical identifiability of a reduced order model in an activated sludge process doing nitrification and denitrification

1998 ◽  
Vol 37 (12) ◽  
pp. 309-316 ◽  
Author(s):  
S. Julien ◽  
J. P. Babary ◽  
P. Lessard
Keyword(s):  
Activated Sludge ◽  
Reduced Order Model ◽  
Actual Behavior ◽  
Activated Sludge Process ◽  
Order Model ◽  
Identifiability Analysis ◽  
Reduced Order ◽  
3 Dimensional ◽  
Nitrification And Denitrification ◽  
Line Oxygen

This paper deals with the structural identifiability and the identification of the parameters of a reduced order model used for control of a single reactor activated sludge process doing nitrification and denitrification. This reduced order model is splitted into two submodels, one 3-dimensional state submodel in aerobic conditions and one 2-dimensional state submodel in anoxic conditions. The identifiability analysis is based on on-line oxygen and nitrate concentrations data. It has been shown that the reduced order model is structurally identifiable. The parameter identification has been carried out by using the simplex method of Nelder and Mead. Simulation results performed over a range of six hours (two aerobic/anoxic cycles), show that there exists a good fit between the simulated solution and the actual behavior of a lab scale pilot plant.

WOODCHIPS BARRIERS FOR ATRAZINE AND NITRATE REMOVAL; EFFECT OF BIOCHAR AMENDMENT

2018 ◽  
Author(s):  
Bahareh Hassanpour Guilvaiee ◽  
◽  
Tammo Steenhuis ◽  
Larry Geohring
Keyword(s):  
Nitrate Removal ◽  
Biochar Amendment

Quantitative assessment of the effects of biochar amendment on photosynthetic carbon assimilation and dynamics in a rice–soil system

2021 ◽  
Author(s):  
Zhiwei Liu ◽  
Xiulan Wu ◽  
Shixian Li ◽  
Wei Liu ◽  
Rongjun Bian ◽  
...  
Keyword(s):  
Quantitative Assessment ◽  
Carbon Assimilation ◽  
Rice Soil ◽  
Soil System ◽  
Photosynthetic Carbon ◽  
Photosynthetic Carbon Assimilation ◽  
Biochar Amendment

Nitrification and denitrification in recirculating aquaculture systems: the processes and players

2021 ◽  
Author(s):  
Prasannan Geetha Preena ◽  
Vattiringal Jayadradhan Rejish Kumar ◽  
Isaac Sarojini Bright Singh
Keyword(s):  
Recirculating Aquaculture ◽  
Recirculating Aquaculture Systems ◽  
Nitrification And Denitrification

scholarly journals Remediation of mercury-contaminated soils and sediments using biochar: a critical review

Biochar ◽  
2021 ◽  
Author(s):  
Qian Yang ◽  
Yongjie Wang ◽  
Huan Zhong
Keyword(s):  
Health Risks ◽  
Contaminated Soils ◽  
Functional Materials ◽  
Redox Conditions ◽  
Existing Problems ◽  
Soils And Sediments ◽  
Underlying Mechanisms ◽  
Biochar Amendment

AbstractThe transformation of mercury (Hg) into the more toxic and bioaccumulative form methylmercury (MeHg) in soils and sediments can lead to the biomagnification of MeHg through the food chain, which poses ecological and health risks. In the last decade, biochar application, an in situ remediation technique, has been shown to be effective in mitigating the risks from Hg in soils and sediments. However, uncertainties associated with biochar use and its underlying mechanisms remain. Here, we summarize recent studies on the effects and advantages of biochar amendment related to Hg biogeochemistry and its bioavailability in soils and sediments and systematically analyze the progress made in understanding the underlying mechanisms responsible for reductions in Hg bioaccumulation. The existing literature indicates (1) that biochar application decreases the mobility of inorganic Hg in soils and sediments and (2) that biochar can reduce the bioavailability of MeHg and its accumulation in crops but has a complex effect on net MeHg production. In this review, two main mechanisms, a direct mechanism (e.g., Hg-biochar binding) and an indirect mechanism (e.g., biochar-impacted sulfur cycling and thus Hg-soil binding), that explain the reduction in Hg bioavailability by biochar amendment based on the interactions among biochar, soil and Hg under redox conditions are highlighted. Furthermore, the existing problems with the use of biochar to treat Hg-contaminated soils and sediments, such as the appropriate dose and the long-term effectiveness of biochar, are discussed. Further research involving laboratory tests and field applications is necessary to obtain a mechanistic understanding of the role of biochar in reducing Hg bioavailability in diverse soil types under varying redox conditions and to develop completely green and sustainable biochar-based functional materials for mitigating Hg-related health risks.

Effect of biochar amendment on compost quality, gaseous emissions and pathogen reduction during in-vessel composting of chicken manure

Chemosphere ◽  
2021 ◽  
pp. 131129
Author(s):  
Woo Jin Chung ◽  
Soon Woong Chang ◽  
Dhiraj Kumar Chaudhary ◽  
Joung Du Shin ◽  
Hyunook Kim ◽  
...  
Keyword(s):  
Chicken Manure ◽  
Gaseous Emissions ◽  
Compost Quality ◽  
Pathogen Reduction ◽  
Biochar Amendment

Increase in arsenic methylation and volatilization during manure composting with biochar amendment in an aeration bioreactor

2021 ◽  
Vol 411 ◽  
pp. 125123
Author(s):  
Weiwei Zhai ◽  
Ting Guo ◽  
Su Yang ◽  
Williamson Gustave ◽  
Muhammad Zaffar Hashmi ◽  
...  
Keyword(s):  
Arsenic Methylation ◽  
Biochar Amendment
Sign in / Sign up

Export Citation Format

Share Document