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AbstractIn recent years, interest has grown in biological processes that limit the migration of dissolved petroleum hydrocarbons in groundwater.While the process of biodegradation of dissolved petroleum hydrocarbons in groundwater is generally acknowledged, only a few caret%lly documented examples exist. Work to date at a former natural gas processing plant provides documentation of natural biodegradation of dissolved hydrocarbon in groundwater as well as insights into the microbiological processesthat are most significant at this site.
Biosolids production in the activated sludge process generates an additional cost to wastewater treatment plants due to the growing requirements for sludge treatment and disposal. This work focuses on the application of ozonation to reduce sludge production in an industrial wastewater treatment plant. The results show that ozonation was able to promote cell wall rupture, releasing intracellular matter into the liquid medium. This effect was observed by the increase in concentrations of DNA (1.14 to 7.83 mg/L) and proteins (0.5 to 45.602 mg/L) in the liquid phase, when ozonation was applied during 10 min, using 30 mg/L of ozone. Reduction of sludge production was assessed by calculating the observed sludge yield coefficient (Y) in bench-scale continuous experiments conducted with varying proportions of ozonated sludge in the recycle stream and recycle ratios. Reduction of sludge production ranged from 14 to 39%, depending on the experimental conditions. The best result in terms of sludge excess reduction was achieved when 20% of the recycle sludge was ozonated and the recycle ratio was 0.67.
Esta pesquisa tem como objetivo geral elaborar cenários mais prováveis para o turismo no estado do Ceará (Brasil), considerando o período de 2013 a 2023, e tem como objetivo específico propor estratégias públicas e privadas para os cenários prospectados. A metodologia utilizada é de cunho descritivo, qualitativo, utilizando-se de material secundário, além de consulta a expertises e apoio da matriz MICMAC. O resultado do trabalho foi a elaboração de dois cenários, um realista e outro pessimista, com a proposição de políticas públicas para cada um deles. O cenário realista projetaque o mix de serviços oferecidos pelas empresas e o Estado será ampliado, no que se refere a atrações turísticas cearenses. Para o cenário pessimista, considera-se que haverá um encolhimento do investimento em atrações turísticas no Ceará, com redução do mix dos serviços oferecidos pelas empresas e menor valorização da capacitação da mão de obra local.
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