Oral Report. Summer' 09 Proposal

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Education Technology

Maria A. Rosa RISE Summer Program The rice fibre as a substitute for the disposable ware

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Biotechnology advances in Algal Biofuel, one of the promising field for near future! This global warming due to our urgent necessary uses for all aspects of life, whether it is for living or just for recreation, we use fossils as our fuels. Even all your kitchen stuffs, from utensils to plastic containers... from LPG gas to your perfumes, medicines and cosmetics, all and all, directly or indirectly during their processings, uses this carbon emitting FOSSILS FUELS. On the other opposite hand, we could use biofuel like Microalgae and various others.

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Phycoremediation is a green technology that supports the direct use of living green microalgae for in situ, or in place removal, degradation, of contaminants in soils, sludge, sediments, surface water and ground waters by the mechanisms of bio-transformation, bio-accumulation, bio-concentration, bio-sparging. It can be said by the current study that microalgae has a great potential for the treatment of industrial and municipal wastewaters as compared to the chemical treatments available commercially. Biological systems are much more efficient in cleaning the excess nutrients from the waste water followed by generation of valuable biomass which can be applied in the food, fertilizer, energy production as use of inorganic chemicals like lime and ferrous sulphate generates huge amount of sludge in textile industries, but on the other hand static anaerobic treatment using acclimatized MLSS gives better colour reduction with zero sludge generation. Microalgal cells can be used in free form to treat waste waters containing high C.O.D., high ammonical nitrogen and high TDS. It not only provides a better reduction of chemicals from wastewaters but it also helps to reduce the operational cost of ETP. Microalgaes not only helps to remediate industrial waste waters but also to treat sweage water and to restore natural water bodies like lakes and ponds. As they are active in remediating the chemicals but also it shows an antagonistic effect against some pathogenic germs like total coliforms and fecal coliforms. These microalgal cells can also be combined with bacterial biomass of activated sludge process to develop an Algal-Bacterial consortium (ALBA) for better enhancement in the reduction of chemicals from the wastewaters as this symbiotic relation of algae and bacteria provides high satiability of the microalgae along with MLSS and faceable in terms of price and economy for instance the bacterial biomass provides carbon dioxide to algal cells for photosynthesis and in return the bacteria acquires oxygen from algae. The harvested biomass from the ETP’s can be used as bio-fertilizers as it consists of appropriate ratio of vital macro and micro nutrients like N,P,K etc. which enhance the growth of plantlets. It can also be used as aqua feeds for shrimps, fishes and molluscs. Furthermore these microlgal cells are non-toxic in the environment as it becomes a part of food chain and do not cause eutrophication. Therefore, micro-algal based treatment is most suitable for the treating the waste waters and restoring the natural water bodies as compared to other chemical treatments.

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With increasing industrialization, rapid economic development, and an ever-growing population, the problem of water pollution and water scarcity is increasing at an alarming rate. It is estimated that more than 800,000 annual diarrheal deaths are attributed to unsafe water usage. Furthermore, traditional wastewater treatment technologies, such as adsorption, chlorination, and biochemical methods are difficult to utilize for treating wastewater at low concentration for they lead to high toxicity. However, Nano TiO2-based photocatalytic technology is a new highefficiency and energy-saving alternative because NanoTiO2 can degrade organic pollutants into non-toxic compounds such as CO2 and H2O under the sunlight. Nonetheless, separating and recycling Nano TiO2 from water remains to be a huge challenge. Therefore, we prepared PVA-Nano TiO2 foam at high speed stirring, film laying, drying, and thermal crosslinking to embed in PVA for reuse and recycle. The morphology, structure, and photocatalytic performance of PVA-Nano TiO2 foam were characterized in detail by SEM, TGA, FTIR, UV-Vis, and so on. The results show the cell size of the foam is about 0.2-0.5 mm, and the swelling degree of PVA-Nano TiO2 foam is about 600%. The TiO2 nanoparticles also have no effect on thermal crosslinking of PVA. Under sunlight, the PVA-Nano TiO2 foam possesses photocatalytic activity that is higher than that of non-porous PVANano TiO2 film due to the higher permeability of water and impurity with higher porosity. In addition, the PVANano TiO2 foam exhibits good reusability under multi-cycle use. Thus, this novel design of PVA-Nano TiO2 foam is simple, eco-friendly, and effective with potential practical application value.

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