Aušra Zigmontienė

Investigation and analysis of air-cleaning biofilter hybrid biocharge quantitative and qualitative parameters

Abstract Investigation of microorganism quantitative and qualitative parameters in the hybrid load of the biofilter allows improving the parameters of one of the most effective and cheapest air cleaning technologies of volatile organic compounds (VOCs)—biofiltration process. The point of biofiltering is the partitioning of volatile organic compounds during the metabolism of microorganisms. In pursuance to assure the best conditions for their growth, the biofilter is loaded with biocharge mixture made of zeolite, foam and wood shavings. The device is filled with VOCs mixture consisting of: acetone of ketone group; butanol of alcohol group and xylene of aromatic carbohydrate group. The optimal temperature of 30 °C is sustained in the air-cleaning device as well as neutral concentration of hydrogen ions (pH 6.9–7.1), biocharge mixture is irrigated with mineral saline solution. The investigation results show that the biofilter is operating most effectively 8 weeks after the end of its activation. The most pro...

Investigation into Total Carbon in Sewage Sludge and Compost

The relation between soil and climate change is highly important. The soil is a part of the climate change problem; however, it could also be a part of the solution to the encountered problem. For a better understanding and estimation of climate gas emissions and for slowing down these processes, more investigation in this field is required. Sustainable soil usage could help with saving or even increasing the amount of carbon in the soil. Such process will sustain the balance of climate gas emissions. Soil carbon is an essential element that determines soil fertility. Recently, the importance of organic materials for soil quality and the applicability of sewage sludge to enrich the soil using such materials have been discussed. Sewage sludge as an organic carbon source can improve soil quality. The best way to stabilise and immobilise carbon is mineralisation that occurs in the composting process. The article analyses and evaluates the loss of organic carbon content during the composting process of sewage sludge and explores loss rates by adding various natural supplements (wood shavings and chips, milled bark, grained branches, peat and zeolite).

Evaluation of Biogenic Substances in the River Šventoji

The current research considers the principles of selection of the climate information needed for the building envelope and indoor climate design and adopted in Russia and some European countries. Special reference has been made to the shortcoming of methodologies that include the notion of a typical year, and the advantages of climate data sets generated via software-based designs, using pseudo-random number generators. The results of the average temperature of the coldest five-day period with various supplies were calculated using the numerical Monte-Carlo simulations, as well as the current climate data. It has been shown that there is a fundamental overlap between the statistical distribution of temperatures of both instances and the possibility of implementation a probabilistic-statistical method principle in the development of certain climate data, relative to envelopes and thermal conditions of a building. The calculated values were combined with the analytic expression of the normal law of random distribution and the correlations needed for the main parameter selection.