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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Effects of Thermal Hydrolysis Pre-Treatment on Anaerobic Digestion of Sludge

Bishnoi, Pallavi 14 September 2012 (has links)
The increased demand for advanced techniques in anaerobic digestion over the last few years has led to the employment of various pre-treatment methods prior to anaerobic digestion to increase gas production. These pre-treatment methods alter the physical and chemical properties of sludge in order to make it more readily degradable by anaerobic digestion. The thermal hydrolysis process has been used in several treatment plants around the world, but none currently operate in the US. Thermal hydrolysis causes cell walls to rupture under the effect of high temperature and high pressure and results in highly solubilized product which is readily biodegradable. The performance of the process was evaluated for a treatment plant located in Dallas, TX. The performance assessment was based on various characteristics including pH, solids removal, COD removal and gas production. The study was conducted in two phases to investigate the effect of change in mesophilic temperature (37°C and 42°C) and the effect of solids retention time (SRT) (15 days and 20 days). Thermally hydrolyzed combined (1:1) primary and waste activated sludge was fed to a Thermal Hydrolysis (TH) anaerobic digester and its performance was compared to a conventional mesophilic anaerobic digester receiving non pre-treated sludge. The thermal hydrolysis pre-treatment was found to be more effective as compared to the conventional anaerobic digester. The efficiency of the process varied slightly with increase in temperature but the change in SRT was seen to have a greater impact on the digester's performance. The pre-treatment technique was observed to deliver the best results at a 20 day SRT. / Master of Science
2

A problem?tica do cheque p?s-datado

Azambuja, F?bio Melo de 19 December 2007 (has links)
Made available in DSpace on 2015-04-14T14:33:17Z (GMT). No. of bitstreams: 1 397639.pdf: 91565 bytes, checksum: 5d2c8877bf9ab375f20569bd4542ef7b (MD5) Previous issue date: 2007-12-19 / A presente disserta??o versa sobre o cheque p?s-datado, a sua origem, a sua utiliza??o pela sociedade brasileira, a sua previs?o legal, a doutrina e a jurisprud?ncia sobre o assunto. Considerando-se a sua crescente utiliza??o e a falta de regulamenta??o legal, ocorre uma inseguran?a jur?dica. Comenta-se, tamb?m, a solu??o legal encontrada por outros pa?ses. Analisam-se, ainda, os projetos de lei em tramita??o na c?mara federal e senado que buscam a regulamenta??o do cheque p?s-datado. A disserta??o encerra, demonstrando que os projetos de lei n?o poder?o alterar a estrutura da lei do cheque, pois a referida lei ? fruto de acordo internacional aprovado pelo congresso nacional, concluindo que o titulo de credito analisado devera surgir como um novo titulo de credito, atrav?s de lei pr?pria.

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