Search results for "talous"
showing 10 items of 874 documents
Pienten maaseutukuntien mahdollisuudet biokaasun hyödyntämiseen : esimerkkinä Soinin kunta
2012
Biokaasua voidaan tuottaa erilaisista orgaanisista materiaaleista kuten maatalouden lannasta, jätevesistä, energiakasveista tai biojätteistä. Orgaanisista jätteistä etenkin lantaa syntyy maaseudulla merkittäviä määriä, mutta pienissä maaseutukunnissa muiden orgaanisten jätteiden materiaalivirrat voivat olla pieniä. Pienten maaseutukuntien metaanipotentiaalia tutkittiin tapauskohtaisesti Etelä-Pohjanmaalla sijaitsevassa Soinin kunnassa. Soinin biokaasun tuotannon mahdollisuudet selvitettiin kunnallisen jäteveden, erilliskerätyn biojätteen, maatalouden lannan ja nurmipotentiaalin materiaalivirtojen avulla käyttäen apuna vuosien 2011 ja 2012 tietoja. Jäteveden kuivatun lietteen, naudan lietela…
Is Aquaponics Beneficial in Terms of Fish and Plant Growth and Water Quality in Comparison to Separate Recirculating Aquaculture and Hydroponic Syste…
2022
Aquaponics is a technique where a recirculating aquaculture system (RAS) and hydroponics are integrated to grow plants and fish in a closed system. We investigated if the growth of rainbow trout (Oncorhynchus mykiss) and baby spinach (Spinacia oleracea) would be affected in a coupled aquaponic system compared to the growth of the fish in RAS or plants in a hydroponic system, all systems as three replicates. We also investigated the possible effects of plants on the onset of nitrification in biofilters and on the concentration of off-flavor-causing agents geosmin (GSM) and 2-methylisoborneol (MIB) in rainbow trout flesh and spinach. For the fish grown in aquaponics, the weight gain and speci…
Tracing activation efficiency of the bio-filtration bacteria in a recirculating aquaculture system using stable isotope analysis
2016
One challenge in starting a new recirculation aquaculture system (RAS) is to find the most efficient method to activate the nitrifying bacterial biofilm in the bio-filtration system. It has been suggested that chemical startup with ammonia and nitrite surpasses the “cold start” method where biofilm originates from the fish introduced to the un-activated system. However, there is no information on how the start-up method affects the actual nitrification activity of the bio- filtration system. The objectives of this study were to evaluate how different activation techniques affect the overall function and the nitrification activity of the bio-filtration units, and the interactions between het…
UML Artefacts for a Blockchain-enabled Platform for Fairtrade
2021
Fairtrade-certified products have successfully entered the mainstream distribution channels mostly in developed countries, and these products are now sold in famous supermarket chains. Nonetheless, the packaging and labeling of products as “Fairtrade” commands premium pricing in the marketplace. How much of this, however, is valid and justified? Despite the reputable certification mechanisms for quality assurance, mass media reports suggest that much of the “surplus value” goes to the accreditation agencies themselves instead of the producers. This article proposes an agenda to set this right with a blockchain platform that provides “trust-free” assurances of verifiable labeling. Using an A…
Testate amoebae community analysis as a tool to assess biological impacts of peatland use
2018
As most ecosystems, peatlands have been heavily exploited for different human purposes. For example, in Finland the majority is under forestry, agriculture or peat mining use. Peatlands play an important role in carbon storage, water cycle, and are a unique habitat for rare organisms. Such properties highlight their environmental importance and the need for their restoration. To monitor the success of peatland restoration sensitive indicators are needed. Here we test whether testate amoebae can be used as a reliable bioindicator for assessing peatland condition. To qualify as reliable indicators, responses in testate amoebae community structure to ecological changes must be stronger than ra…