Search results for "OMAS"

Increasing air temperature relative to water temperature makes the mixed layer shallower, reducing phytoplankton biomass in a stratified lake

2023

The depth of the mixed layer is a major determinant of nutrient and light availability for phytoplankton in stratified waterbodies. Ongoing climate change influences surface waters through meteorological forcing, which modifies the physical structure of fresh waters including the mixed layer, but effects on phytoplankton biomass are poorly known. To determine the responses of phytoplankton biomass to the depth of the mixed layer, light availability and associated meteorological forcing, we followed daily changes in weather and water column properties in a boreal lake over the first half of a summer stratification period. Phytoplankton biomass increased with the deepening of the mixed layer …

Rauga Kluyveromyces marxianus biomasas producēšana laktozi saturošos substrātos

2015

Bakalaura darba mērķis bija izvērtēt aerācijas, temperatūras, rauga ekstrakta, melases, amonija sulfāta un urīnvielas ietekmi uz biomasas producēšanu un tās sastāvu laktozes saturošās barotnēs. Fermentācijām tika izvēlēts rauga Kluyveromyces marxianus DSM 5422 celms, kas uzrādīja labāku biomasas iznākumu, salīdzinot ar rauga Kluyveromyces lactis DSM 4394, DSM 70800 un DSM 70799 celmiem. Aerācijas diapazonā 0,2 – 2,0 L·L-1·min-1 optimāls biomasas iznākums tika novērots 1,0 L·L-1·min-1 aerācijas režīmā 35oC temperatūrā. Tika pētīta dažādu piedevu (rauga ekstrakta, melases, amonija sulfāta, urīnvielas) ietekme uz biomasas veidošanos. Rauga ekstrakta un melases pievienošana fermentācijas barotn…

Seasonality of bacterioplankton in subarctic ponds above and below treeline

2009

Analysis of Biomass Characteristics in MBR and MB-MBR Systems Fed with Synthetic Wastewater: Influence of a Gradual Salinity Increase

2014

The paper presents the results of a field gathering campaign carried out on two different pilot scale membrane bioreactor (MBR) systems, treating synthetic wastewater subject to a gradual increase of salinity. One was a conventional MBR system, while the other was a moving bed biofilm membrane bioreactor (MB-MBR), which combines suspended biomass and biofilm. Indeed, the presence of suspended carriers inside the bioreactor seems to give benefits due to the collisions between the circulating media and the membrane. The aim of the study was the comparison of two configurations in terms of biomass activity characterization and performance (pollutants removal and hydraulic behaviour). The resul…

On flora semantics in house names found in Vidzeme: materials contained in the 1826 counting of souls in Vidzeme province

2014

On flora semantics in house names found in Vidzeme: materials contained in the 1826 counting of souls in Vidzeme province The information of the counting of souls containing both house names and names of individuals is an essential aspect of historical onomastics. The first counting of souls in Vidzeme took place in 1782 and coincided with the 4 th analogous census of the provinces of Russia. Subsequently these took place at irregular intervals, the 5 th in 1795, the 6 th in 1811, the 7 th in 1816, the 8 th in 1834, the 9 th in 1850, and the final, 10 th in 1858. The number of house names entered in the 1826 counting of souls in Vidzeme province (guberna) is 14,500, including those of peasa…

Algae in urban water bodies - control of growth and use as a biomas

2018

Enhancing the ecology security of Ukraine and other developing countries is predetermined by the environmental problems of cities. It prompts studies on the contamination of city's and adjacent water bodies. The control of blue-green algae distribution and the use of its biomass for production of the biofuels, energy, oils, medicine, etc. is one of the contributing factors to the well-balanced development of infrastructure of cities. The intensity of the processes of eutrophication and the species composition of the algae, which cause algal blooming, was investigated based on data of the Vorskla River in Poltava city (Ukraine). Relevant methods, statistical data of Ukrainian Environmental S…

Geographic Information System of Primary Carbon Deposit of Mangrove Forest in Merauke District, Indonesia

2020

Emission factors with increasing carbon dioxide (CO2) originating from various human activities are one of the causes of global climate change. The mangrove forest is a type of plant that has a great ability to absorb carbon in the atmosphere and store it in biomass through photosynthesis. Merauke Regency has 20 separate parts based on regional administration, but primary Mangrove forests are only found in ten regions (district). The results of research carried out using geographic information systems (GIS) in processing primary Mangrove forest data based on 2016 land cover map data in Merauke district, the area of primary mangrove forest reaches 184.402 ha, which is spread in various regio…

Assessment of Effectiveness of Organo-Mineral Fertilizer Made of Coffee Spent Grounds and Biomass Ash

2019

Optimization of the biodegradable wastes management is one of the main goals of the activities taken up in the European Union. The aim of the present paper is to define the possibilities of supporting the process of golden rod yield (Solidago canadensis L.) by using different mineral-organic fertilizers, in a form of granulated substances, produced from extracted coffee wastes (CSG) as well as from ash which is the result of woody biomass combustion. Golden rod, as a potential energetic plant, is very easy to grow because it covers the grounds which are not utilized agriculturally or the ones localised in the close neighbourhood of industrial areas. For certain experimental purposes, a fiel…

THE POSSIBILITY OF DISPOSING OF SPENT COFFEE GROUND WITH ENERGY RECYCLING

2015

The current policy of waste management requires, above all, a gradual reduction of waste amount and, to a larger extent, forces us to seek new methods of waste disposal. Recycling the energy contained in biomass waste is a more and more universally applied method of thermal converting. Biomass combustion allows saving fossil fuels which fits into sustainable development. This paper checks the possibility of using spent coffee ground (SCG) in energy recycling using a combustion process. This particular biomass type up to now has not been widely examined, which inclines to consider its usage as a potential additive to alternative fuels. In the study, we examined the quality of fuel, which was…

Numerical Investigation of a Wood-Chip Downdraft Gasifier

2019

Biomass gasification is regarded as one of the most promising technology in the renewable energy field. The outcome of such operation, i.e. the synfuel, can be exploited in several ways, for example powering engines and turbines, and is considered more flexible than the biomass itself. For this reason, a careful analysis of the gasification performance is of paramount importance for the optimization of the process. One of the techniques that can be used for such a purpose, is the numerical analysis. CFD is indeed a tool that can be of great help in the design and study of the operation of the gasifier, allowing for an accurate prediction of the operating parameters. In this work, a downdraf…