scholarly journals The Humidity of the Volcanic Soils and Their Impact on the Processes of Mass Removal in Colombia

Soil Moisture ◽  
2019 ◽  
Author(s):  
William Chavarriaga Montoya
Keyword(s):  
Volcanic Soils ◽  
Mass Removal

Comparative study of domestic wastewater treatment efficiencies between facultative pond and water spinach pond

1995 ◽  
Vol 32 (3) ◽  
pp. 263-270 ◽  
Author(s):  
Seni Karnchanawong ◽  
Jaras Sanjitt
Keyword(s):  
Growth Rates ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Organic Content ◽  
Water Spinach ◽  
Removal Rates ◽  
Mass Removal ◽  
Loading Rates ◽  
Tropical Conditions ◽  
Average Water

Two pilot-scale studies were comparatively conducted under tropical conditions during December 1992 to September 1993. One study involved facultative ponds(FP) and the others water spinach ponds(SP). Four rectangular concrete ponds, 0.8 m × 2.4 m × 1.1 m (width × length × depth), were employed to treat the Chiang Mai University campus wastewater. Water spinach (Ipomoea aquatica) was planted in two of the ponds. The influent characteristics noted showed a low organic content, i.e. BOD 25.4-29.9 mg/l, with BOD:N ratio around 1:1. The investigations were conducted using the following hydraulic retention times (HRT): 1.6, 2, 2.7, 4, 8 and 16 d. The results showed that the BOD, COD and SS mass removal rates increased as the mass loading rates increased and the SP was significantly more effective in reducing the organic content than the FP. No relationship was found between TN mass removal and the loading rates. However, the TP mass removal rates in the SP and the FP were rather low and were considered to be insignificant. It was observed that SS accumulated in the water spinach root systems which tended to act as a strainer. This process led to plant growth inhibition and finally die-off. The average water spinach growth rates varied from 37 to 107 g wet wt./(m2.d) and no relationship was established between the growth rates and the HRT.

Facilitating Injustice

2019 ◽  
Author(s):  
Yoosun Park
Keyword(s):  
Social Work ◽  
Public Sector ◽  
Social Workers ◽  
Social Order ◽  
Mass Removal ◽  
Professional Obligations ◽  
The Past ◽  
Private Charity ◽  
Political Alliances ◽  
Major Shift

Social workers were involved in all aspects of the removal, incarceration, and resettlement of the Nikkei, a history that has been forgotten by social work. This study is an effort to address this lacuna. Social work equivocated. While it did not fully endorse mass removal and incarceration, neither did it protest, oppose, or explicitly critique government actions. The past should not be judged by today’s standards; the actions and motivations described here occurred in a period rife with fear and propaganda. Undergoing a major shift from its private charity roots into its public sector future, social work bounded with the rest of society into “a patriotic fervor.” While policies of a government at war, intractable bureaucratic structures, tangled political alliances, and complex professional obligations all may have mandated compliance, it is, nevertheless, difficult to deny that social work and social workers were also willing participants in the events, informed about and aware of the implications of that compliance. In social work’s unwillingness to take a resolute stand against removal and incarceration, the well-intentioned profession, doing its conscious best to do good, enforced the existing social order and did its level best to keep the Nikkei from disrupting it.

scholarly journals Sorption and Desorption of Vanadate, Arsenate and Chromate by Two Volcanic Soils of Equatorial Africa

Soil Systems ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 22
Author(s):  
Sara Gonzalez-Rodriguez ◽  
Maria Luisa Fernandez-Marcos
Keyword(s):  
Laboratory Experiments ◽  
Sorption Isotherms ◽  
Soil Samples ◽  
Mineral Surfaces ◽  
Volcanic Soils ◽  
Iron Species ◽  
Freundlich Model ◽  
Equatorial Africa ◽  
Relevant Role ◽  
Icp Mass Spectrometry

Sorption of oxyanions by soils and mineral surfaces is of interest due to their role as nutrients or pollutants. Volcanic soils are variable charge soils, rich in active forms of aluminum and iron, and capable of sorbing anions. Sorption and desorption of vanadate, arsenate, and chromate by two African andosols was studied in laboratory experiments. Sorption isotherms were determined by equilibrating at 293 K soil samples with oxyanion solutions of concentrations between 0 and 100 mg L−1 V, As, or Cr, equivalent to 0−2.0 mmol V L−1, 0−1.3 mmol As L−1, and 0−1.9 mmol Cr L−1, in NaNO3; V, As, or Cr were determined by ICP-mass spectrometry in the equilibrium solution. After sorption, the soil samples were equilibrated with 0.02 M NaNO3 to study desorption. The isotherms were adjusted to mathematical models. After desorption with NaNO3, desorption experiments were carried out with a 1 mM phosphate. The sorption of vanadate and arsenate was greater than 90% of the amount added, while the chromate sorption was much lower (19–97%). The sorption by the Silandic Andosol is attributed to non-crystalline Fe and Al, while in the Vitric Andosol, crystalline iron species play a relevant role. The V and Cr sorption isotherms fitted to the Freundlich model, while the As sorption isotherms conformed to the Temkin model. For the highest concentrations of oxyanions in the equilibrating solution, the sorbed concentrations were 37–38 mmol V kg−1, 25 mmol As kg−1, and 7.2–8.8 mmol Cr kg−1. The desorption was low for V and As and high for Cr. The comparison of the sorption and desorption isotherms reveals a pronounced hysteresis for V in both andosols and for Cr in the Silandic Andosol. Phosphate induced almost no V desorption, moderate As desorption, and considerable Cr desorption.

scholarly journals An Assessment of Fish Herding Techniques: Management Implications for Mass Removal and Control of Silver Carp

2021 ◽  
Author(s):  
Josey L. Ridgway ◽  
Katelyn M. Lawson ◽  
Stephen A. Shier ◽  
Robin D. Calfee ◽  
Duane C. Chapman
Keyword(s):  
Silver Carp ◽  
Management Implications ◽  
Mass Removal ◽  
And Control

Models For Laser Ablation Mass Removal And Impulse Generation In Vacuum

2010 ◽  
Author(s):  
John E. Sinko ◽  
Don A. Gregory ◽  
Claude Phipps ◽  
Kimiya Komurasaki ◽  
John Sinko
Keyword(s):  
Laser Ablation ◽  
Impulse Generation ◽  
Mass Removal

Chemical and textural controls on the formation of sepiolite, palygorskite and dolomite in volcanic soils

Geoderma ◽  
2016 ◽  
Vol 271 ◽  
pp. 99-114 ◽  
Author(s):  
Javier Cuadros ◽  
Jose L. Diaz-Hernandez ◽  
Antonio Sanchez-Navas ◽  
Antonio Garcia-Casco ◽  
Jorge Yepes
Keyword(s):  
Volcanic Soils

Materials to cyanobacterial and algal flora from volcanic soils of Shiveluch volcano

2021 ◽  
pp. 135-138
Author(s):  
Rezeda Z. Allaguvatova ◽  
Veronika B. Bagmet ◽  
Arthur Yu. v Nikulin ◽  
Shamil R. Abdullin ◽  
Andrey A. Gontcharo
Keyword(s):  
Species Composition ◽  
Kamchatka Peninsula ◽  
Algal Flora ◽  
Volcanic Soils ◽  
Shiveluch Volcano ◽  
Nitzschia Palea ◽  
Terrestrial Cyanobacteria ◽  
Composition Study ◽  
Cyanobacteria And Algae ◽  
Tetradesmus Obliquus

During the species composition study of terrestrial cyanobacteria and algae from volcanic soils of Shiveluch Volcano (Kamchatka peninsula, Russia) eighteen taxa from five phyla were revealed: Cyanobacteria – 4, Bacillariophyta – 4, Ochrophyta – 2 (Eustigmatophyceae – 1, Xanthophyceae – 1), Charophyta – 1, Chlorophyta – 7 (Chlorophyceae – 2, Trebouxiophyceae – 5). Nitzschia communis Rabenhorst, Nitzschia palea (Kützing) W. Smith, Eolimna minima (Grunow) Lange-Bertalot, Eremochloris sp., Tetradesmus obliquus (Turpin) M.J. Wynne, Nostoc edaphicum Kondratyeva were most frequency.

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