Automatic Backwash Sand Filtering Of Hill Water Retention Pool Using Green Technology

Solar photocatalysis as a potential green technology for the removal of traces of the dye pollutant Indigo carmine (IC) from water is investigated using ZnO as the catalyst. Degradation/decolorization alone does not result in complete decontamination as seen from the significant Chemical Oxygen Demand (COD) of water even after the parent compound has disappeared completely. The degradation proceeds through many intermediates which also get mineralized eventually but slowly. Oxalic acid is identified as a stable slow mineralizing degradation product which itself is formed from other transient intermediates. Effect of various parameters such as catalyst dosage, concentration of the dye, pH, temperature, presence of contaminant salts etc. on the degradation is investigated and quantified. Oxidants such as S2O82- and H2O2 have only moderate influence on the degradation. The degradation follows variable kinetics depending on the concentration of the substrate. The reaction proceeds very slowly in the absence of O2 indicating the importance of reactive oxygen species and hydroxyl free radicals in photocatalysis. H2O2 formed insitu in the system undergoes concurrent decomposition resulting in stabilization in its concentration. The study demonstrates that solar photocatalysis can be used as a viable tool for the purification of water contaminated with traces of IC.

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Influence of exchangeable sodium and clay mineralogy on soil water retention and hydraulic conductivity

Journal of Soil and Water Conservation ◽

10.2489/jswc.2020.00182 ◽

2020 ◽

Vol 75 (6) ◽

pp. 755-764

Author(s):

H.W. Klopp ◽

F. Arriaga ◽

W. Bleam

Keyword(s):

Hydraulic Conductivity ◽

Soil Water ◽

Water Retention ◽

Clay Mineralogy ◽

Exchangeable Sodium ◽

Soil Water Retention

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INFLUENCE OF SOIL MATRIX ON SOIL-WATER RETENTION CURVE AND HYDRAULIC CHARACTERISTICS

Environmental Engineering and Management Journal ◽

10.30638/eemj.2017.088 ◽

2017 ◽

Vol 16 (4) ◽

pp. 869-877

Author(s):

Vasile Lucian Pavel ◽

Florian Statescu ◽

Dorin Cotiu.ca-Zauca ◽

Gabriela Biali ◽

Paula Cojocaru

Keyword(s):

Soil Water ◽

Water Retention ◽

Water Retention Curve ◽

Hydraulic Characteristics ◽

Soil Water Retention Curve ◽

Soil Water Retention ◽

Soil Matrix ◽

Retention Curve

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Soil quality. Determination of unsaturated hydraulic conductivity and water-retention characteristic. Wind's evaporation method

10.3403/03074766 ◽

2004 ◽

Keyword(s):

Hydraulic Conductivity ◽

Soil Quality ◽

Water Retention ◽

Evaporation Method ◽

Retention Characteristic ◽

Unsaturated Hydraulic Conductivity

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Bamboo Waste-based Bio-composite Substance: An application for Low-cost Construction Materials

SPECTA Journal of Technology ◽

10.35718/specta.v4i1.162 ◽

2020 ◽

Vol 4 (1) ◽

pp. 41-48

Author(s):

Teodoro Astorga Amatosa ◽

Michael E. Loretero

Keyword(s):

Composite Materials ◽

Sea Water ◽

Raw Materials ◽

Low Cost ◽

Construction Materials ◽

Single Layer ◽

High Strength ◽

Green Technology ◽

Experimental Medium ◽

Natural Treatment

Bamboo is a lightweight and high-strength raw materials that encouraged researchers to investigate and explore, especially in the field of biocomposite and declared as one of the green-technology on the environment as fully accountable as eco-products. This research was to assess the technical feasibility of making single-layer experimental Medium-Density Particleboard panels from the bamboo waste of a three-year-old (Dendrocalamus asper). Waste materials were performed to produce composite materials using epoxy resin (C21H25C105) from a natural treatment by soaking with an average of pH 7.6 level of sea-water. Three different types of MDP produced, i.e., bamboo waste strip MDP (SMDP), bamboo waste chips MDP (CMDP) and bamboo waste mixed strip-chips MDP (MMDP) by following the same process. The experimental panels tested for their physical-mechanical properties according to the procedures defined by ASTM D1037-12. Conclusively, even the present study shows properties of MDP with higher and comparable to other composite materials; further research must be given better attention as potential substitute to be used as hardwood materials, especially in the production, design, and construction usage.

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Green Synthesis of Silver Nanoparticles by Allamanda cathartica L. Leaf Extract and Evaluation for Antimicrobial Activity

International Journal of Pharmaceutical Sciences and Nanotechnology ◽

10.37285/ijpsn.2013.6.4.9 ◽

2013 ◽

Vol 6 (4) ◽

pp. 2260-2268

Author(s):

M. Linga Rao ◽

Bhumi G ◽

Savithramma N

Keyword(s):

Antimicrobial Activity ◽

Silver Nanoparticles ◽

Leaf Extract ◽

Fusarium Species ◽

Inhibition Zone ◽

Fungal Species ◽

Green Technology ◽

Metallic Silver ◽

Synthesis Of Nanoparticles ◽

Aqueous Leaf Extract

Silver nanoparticles (SNPs) exhibit tremendous applications in medicine as antimicrobial agent. The use of different parts of plants for the synthesis of nanoparticles is considered as a green technology as it does not involve any harmful chemicals. In the present study, we report a rapid biosynthesis of silver nanoparticles from aqueous leaf extract of medicinal plant Allamanda cathartica. The active phytochemicals present in the plant were responsible for the quick reduction of silver ion to metallic silver nanoparticles. The reduced silver nanoparticles were characterized by using UV-Vis spectrophotometry, Scanning Electron Microscope (SEM), Energy Dispersive Analysis of X-ray (EDAX) and Atomic Force Microscopy (AFM). The spherical shaped silver nanoparticles were observed and it was found to 19-40 nm range of size. These phytosynthesized SNPs were tested for their antimicrobial activity and it analyzed by measuring the inhibitory zone. A. cathartica aqueous leaf extract of SNPs showed highest toxicity to Pseudomonas followed by Klebsiella, Bacillus and E. coli and lowest toxicity towards Proteus. In fungal species, highest inhibition zone was noted against Rhizopus followed by Curvularia, Aspergillus flavus and Aspergillus niger and minimum inhibition zone was observed against Fusarium species. These results suggest a promising potential of Indian plant-based green chemistry for production of SNPs for biomedical and nanotechnology applications.

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