Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"recycling of water."”.
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Effect of pH on the denitrification of activated sludge effluent at high oxygen tensions
… been given by sanitary engineers to the problem of nitrogen removal in sewage treatment. This attention is brought about by several problems associated with nitrogen. First, in some locations, such as our southwest United States, there is both an essentially constant supply of water and an …
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Biocatalytic conversion of cellulose towards itaconic acid
… resource for the sustainable production of platform chemicals such as itaconic acid. The biocatalytic conversion of cellulose is a very promising approach due to its high selectivity, mild conditions, and low exergy loss. However, such biocatalytic processes are still seldom applied at …
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Holocene playas as sedimentary evidence for recent climate change in the presently hyperarid western desert, Egypt
… lithostratigraphic and geochronologic studies of Umm Akhtar Playa, a newly discovered dry lake located at ≈ N 22° 36' E 30° 18' in s. Egypt, indicate the accumulation and rapid desiccation of a sizeable (>65 km²) standing water body during the Late Quaternary. An optical date of 15,120 cal yr …
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Investigation of the closed loop processing systems developed for microalgal biofuels
The algal biofuels industry is under development and being investigated at large scale all around the world. To improve the viability of algal biofuels the ability to use closed loop systems that recycle waste and water thereby decreasing the overall waste produced while increasing profitability is …
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Micro-climate modelling and engineering design for a horticultural grow-cell prototype
… grow-cell belongs to a relatively new category of plant factory in the horticultural industry, for which the motivation is the maximization of production and the minimization of energy consumption. Significantly, the plants are grown under artificial lights and there is recycling of water. The …
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Effects of Raceway Pond Water and Nutrient Recycling on Microalgae Production and Harvesting
<p>To be environmentally sustainable, algae biofuel production requires extensive recycling of water and nutrients during algae cultivation. Such recycling can be in the form of reuse of external wastewaters, such as from municipal sewers, but, to achieve significant biofuels production, internal …
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The economics of future membrane desalination processes and applications
Seawater desalination, the desalination of waters flowing back from hydraulic fracturing processes and brackish water desalination constitute important desalination applications. These have a combined market size in excess of $25 billion per annum and a combined water production rate equivalent to …
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The effect of ion accumulation owing to water recycling on flotation performance
With the drive to reduce water usage globally, the mining sector must reassess its water usage as it has in the past contributed greatly to environmental degradation due to effluent discharge, tailing disposal and process water seepage into the water-table. Mineral beneficiation entails different …
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An investigation into the fundamental understanding of an activated sludge bioremediation process and optimisation of thiocyanate and cyanide destruction
… increasingly important due to the depletion of free milling ores. The reaction of CN with reduced sulphur species during the cyanidation process results in the formation of thiocyanate (SCN), often at relatively high concentrations (> 5 000 mg/L). The SCN and residual free CN are deported …
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Dopady klesající spotřeby vody na čistírnu odpadních vod
Bakalářská práce se zaměřuje na vliv a důsledky klesající spotřeby vody na čistírnu odpadních vod. Práce se zabývá spotřebou vody v ČR i obecně ve světě, přičemž se zohlední dopad na hygienické minimum množství vody na obyvatele; zmíněny jsou příčiny klesající spotřeby vody a důsledky tohoto jevu …