A sustainable colloidal material with sorption and nutrient‐supply capabilities for in‐situ groundwater bioremediation

2021 ◽  
Author(s):  
Essouassi Elikem ◽  
Arantxa P. Persico ◽  
David Bulmer ◽  
Steven D. Siciliano ◽  
Paolo Mussone ◽  
...  
Keyword(s):  
Nutrient Supply ◽  
Colloidal Material

scholarly journals Advantages and Limitations of In Situ Methods of Bioremediation

2019 ◽  
Vol 5 ◽  
pp. 1 ◽  
Author(s):  
Jot Sharma ◽  
Keyword(s):  
Microbial Community ◽  
Moisture Content ◽  
Nutrient Supply ◽  
Microbial Populations ◽  
Site Specific ◽  
Natural Processes ◽  
Indigenous Microbial Community ◽  
In Situ Methods ◽  
Contaminant Distribution

There are two major types of in situ bioremediation: intrinsic and enhanced. Both rely on natural processes to degrade contaminants with (enhanced) or without (intrinsic) amendments. In recent years, in situ bioremediation concepts have been applied in treating contaminated soil and groundwater. Removal rates and extent vary based on the contaminant of concern and site-specific characteristics. There are a number of factor/variables that affect the rate of removal such as contaminant and co-contaminant distribution as well as concentration; indigenous microbial populations and reaction kinetics; and parameters such as pH, moisture content, nutrient supply, and temperature. Many of these factors are a function of the site and the indigenous microbial community and, thus, are difficult to manipulate. Specific technologies may have the capacity to manipulate some variables and may be affected by other variables as well; these specific issues are discussed with each technology in the following sections.

Oil bio-degradation in permeable pavements by microbial communities

2002 ◽  
Vol 45 (7) ◽  
pp. 51-56 ◽  
Author(s):  
A.P. Newman ◽  
C.J. Pratt ◽  
S.J. Coupe ◽  
N. Cresswell
Keyword(s):  
Electron Microscopy ◽  
Nutrient Supply ◽  
Laboratory Research ◽  
Motor Oil ◽  
Permeable Pavement ◽  
Flow Through ◽  
Biofilm Development ◽  
Adequate Nutrient ◽  
Scanning Electron

This paper reports on continuing research at Coventry University into the improvement of highway water quality following flow through a permeable pavement. Such pavements have been shown elsewhere to be efficient in-situ bio-reactors, capable of degrading large quantities of clean motor oil. Further laboratory research, reported here, demonstrates that a commercially obtained oil degrading, microbial mixture was not significantly better at degrading clean motor oil than the indigenous microbial biomass established within the pavement over a 4-year period, when provided with an adequate nutrient supply. Scanning electron microscopy has been used to monitor biofilm development, which has also identified that the pavement has developed a complex community structure with high bio-diversity.

Modeling nutrient supply to dairy cattle from a feedstuff using NRC-2001 (a TDN-based model) with inputs based on in situ and mobile bag technique measurements

2005 ◽  
Vol 85 (4) ◽  
pp. 513-519 ◽  
Author(s):  
P. Yu
Keyword(s):  
Dairy Cattle ◽  
National Research Council ◽  
Nutrient Supply ◽  
Microbial Protein ◽  
System A ◽  
Endogenous Protein ◽  
Lupin Seeds ◽  
Feed Protein ◽  
Made In

The objectives of this study were to use the NRC-2001 model with inputs based on in situ and mobile bag techniques to (1) predict the potential nutrient supply to dairy cows using an exampled feed- whole lupin seeds that were systematically toasted and (2) quantitatively determine the effects of toasting (which shifted degradation of protein from the rumen to the abomasum and small intestine without changing intestinal digestion) and optimal toasting conditions by the NRC-2001 model. The quantitative predictions were made in terms of: (1) rumen undegraded and degraded feed protein, (2) truly absorbed undegraded protein, (3) potential microbial protein synthesized in the rumen from rumen available protein or (4) from total digestible nutrients (TDN), (5) truly absorbed rumen synthesized microbial protein, (6) truly absorbed rumen endogenous protein, (7) total metabolizable protein (MP), as well as (8) the protein degradation balance (PDB). The results show that using the NRC-2001 model with inputs based on in situ and mobile bag techniques, the predicted PDB and MP supply to dairy cattle was significantly improved. However, no optimal condition could be obtained from this study due to high PDB values (>48 g kg-1 DM) in all the treatments, predicted by the model. With toasting, temperature and/or duration could go still higher than 136°C and/or longer than 15 min to further prevent potential N loss in the rumen if total tract digestion is not depressed. More study is needed. However, the results differed from that published with the DVE/OEB system (a non-TDN-based model) although the two models had significant correlations with high R (>0.99) values. Using the NRC model, the overall mean for MP was higher (+10 g kg-1 DM), but the PDB values were lower (-12 g kg-1 DM) in comparison with that predicted by the non-TDN based model for the whole lupin seeds. Key words: Modeling nutrient supply, dairy cattle; National Research Council, in situ, mobile bag technique

In situ measurement of soil nutrient supply in lowland rice fields

1997 ◽  
pp. 379-380
Author(s):  
A. Dobermann ◽  
R. Nagarajan ◽  
P. Stalin ◽  
P. Mutukhrishnan ◽  
Ma. A. A. Adviento
Keyword(s):  
Soil Nutrient ◽  
Nutrient Supply ◽  
Rice Fields ◽  
Lowland Rice ◽  
In Situ Measurement

Responses of estuarine nematodes to an increase in nutrient supply: An in situ continuous addition experiment

2015 ◽  
Vol 90 (1-2) ◽  
pp. 115-120 ◽  
Author(s):  
R.C. Ferreira ◽  
A.B. Nascimento-Junior ◽  
P.J.P. Santos ◽  
M.L. Botter-Carvalho ◽  
T.K. Pinto
Keyword(s):  
Nutrient Supply ◽  
Estuarine Nematodes

scholarly journals Soil Nutrient Supply in Cultivated Bush Bean–Potato Intercropping Grown in Subarctic Soil Managed with Agroforestry

2021 ◽  
Vol 13 (15) ◽  
pp. 8185
Author(s):  
Jim D. Karagatzides ◽  
Meaghan J. Wilton ◽  
Leonard J. S. Tsuji
Keyword(s):  
Soil Nutrient ◽  
Growing Season ◽  
Agroforestry System ◽  
Nutrient Supply ◽  
James Bay ◽  
Northern Ontario ◽  
Available Nutrients ◽  
Bush Bean ◽  
Positive Correlations

To address food insecurity in northern Canada, some isolated communities started gardening initiatives to reduce dependencies on expensive foods flown in to communities. From 2012–2014, soils in northern Ontario James Bay lowlands were cultivated with bush beans and potatoes, grown in sole and intercropping configurations, in an open field and an agroforestry system enclosed by willow trees. The objective of this study was to compare the supply rates of 15 plant-available nutrients in these soils using in situ ion exchange membranes. After three years of cultivation, the agroforestry site had significantly greater supply of PO4, Ca, and Zn and these nutrients had positive correlations with yield. By contrast, the open site had significantly greater supply of Mg, SO4, and B; these nutrients, and Al, had negative correlations with yield. Whilst there were no differences between sole and intercropping configurations, significantly greater supply of NO3, Ca, Cu, Fe, and Zn occurred early in the growing season, compared to significantly greater supply of K, SO4, B, and Al later in the season. Significantly greater yields have been harvested in the agroforestry site and it is suspected that the presence of a willow shelterbelt improves the microclimate and plant-available PO4, Ca, and Zn.

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

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