Essays about: "vfa"

Showing result 16 - 20 of 47 essays containing the word vfa.

  1. 16. Volatile fatty acid production from co-fermentation of primary sludge and food waste without pH control

    University essay from KTH/Hållbar utveckling, miljövetenskap och teknik

    Author : Binyam Bedaso; [2019]
    Keywords : Volatile fatty acid; Co-fermentation; Primary sludge; Food waste;

    Abstract : The production of volatile fatty acids (VFAs) from waste stream is gaining high attention because of their high market value and wide range of applications. In this study, the production of VFA from co-fermentation of primary sludge from wastewater treatment plant and food waste without pH control was evaluated using a pilot-scale reactor in a semi-continuous mode of operation. READ MORE

  3. 17. Production of volatile fatty acids from anaerobic digestion using food waste, sludge and cow manure

    University essay from Högskolan i Borås/Akademin för textil, teknik och ekonomi

    Author : Zahraa Alshwan; Simon Hultman; [2019]
    Keywords : VFAs; anaerobic digestion; food waste; sludge; cow manure;

    Abstract : Volatile fatty acids (VFAs) are important building blocks for the chemical industry. These acids can be produced through environmentally friendly processes from a variety of wastes, such as food waste, sludge and cow manure, through anaerobic digestion (AD). The main objective of this thesis was to investigate which operating parameters (e.g. READ MORE

  4. 18. Våm-pH hos mjölkkor : jämförelse av mättekniker och pH-förändring i samband med foderintag

    University essay from SLU/Dept. of Animal Nutrition and Management

    Author : Veronica Furenbäck; [2019]
    Keywords : nätmagens pH; våmacidos; SARA; LRCpH; eBolus; buffring; salivflödeshastighet; tuggaktivitet; idissling; peNDF; partikellängd; sortering;

    Abstract : Våmmens pH hos mjölkkor varierar under dygnet och mikroberna i våmmen behöver ett pH mellan 6-6,5 för att fungera optimalt. Normalt hålls våm-pH stabilt genom att kon absorberar flyktiga fettsyror (VFA) till blodet och den viktigaste mekanismen är saliven vilket har en buffringsförmåga då den innehåller bikarbonat och vätefosfatjoner. READ MORE

  5. 19. Pre-acidification of a Synthetic Dairy Wastewater in Continuously Stirred Tank Reactors

    University essay from Lunds universitet/Kemiteknik (CI)

    Author : Can Xiong; [2019]
    Keywords : pre-acidification process; hydraulic retention time; soluble chemical oxygen demand transformation into fermentation product; volatile fatty acids; distribution; water engineering; environmental engineering; vattenförsörjningsteknik; avloppsteknik; Earth and Environmental Sciences; Technology and Engineering;

    Abstract : Two-stage anaerobic digestion is considered as a sustainable and efficient way to deal with dairy effluent, and is commonly applied. The pre-acidification happening during the first stage of this process could be used to buffer the complex conditions in the initial dairy effluent, as well as produce intermediary product such as volatile fatty acids (VFA), and it is essential to be controlled. READ MORE

  6. 20. Application of volatile fatty acids from waste as an external carbon source for the denitrification process

    University essay from KTH/Hållbar utveckling, miljövetenskap och teknik

    Author : Chengyang Pan; [2019]
    Keywords : Volatile fatty acids VFAs ; Denitrification; External carbon sources; Wastewater treatment; Manometric method; Flyktiga fettsyror VFAs ; Denitrifikation; Externa kolkällor; Avloppsrening; Manometrisk metod;

    Abstract : The gap between resource demand for the industrialized world and non-renewable feedstock like fossil fuels, essential agricultural fertilizer is getting increasingly severe, which has resulted in alarming-increasingly impacts on worldwide environmental problems. Meanwhile, wastewater treatment plants (WWTPs), as an essential facility for urbanization, is also confronting new rising challenges such as energy consumption and operation costs rather than only improving effluent wastewater quality. READ MORE