In this study, the effect of mixing on volatile fatty acid (VFA) production and composition was investigated through running five identical bench-scale reactors that were filled with primary solid and dosed with either pure glycerol or biodiesel waste. Experimental results revealed that there was an inverse correlation between the mixing intensity and the VFA production. The total VFA production in the un-mixed reactor was 9,787 ± 3,601 mg COD/L, whereas in the reactor mixed at 100 rpm this dropped to 3,927 ± 1,175 mg COD/L, while both types of reactor were dosed with pure glycerol at the beginning of each cycle to reach the initial concentration of 1,000 mg/L (1,217 mg COD/L). Propionic acid was the dominant VFA in all the reactors except the reactor mixed at 30 rpm. It is hypothesized that low mixing facilitated hydrogen transfer between obligate hydrogen producing acetogens (OHPA) and hydrogen consuming acidogens in these non-methanogenic reactors. Also, in a narrower range of mixing (0 or 7 rpm), the total VFA production in biodiesel waste-fed reactors was considerably higher than that of pure glycerol-fed reactors.
Taking matters into hand - Case Study
Biofuels must be up to scratch as contaminated or improperly blended fuel can damage a company’s bottom line. To ensure product quality several options exist including laboratory analysis, field test kits and portable lab instruments. Laboratory testing would be the ideal solution if everyone had the budget and the time to wait for the results. But in a market where time is money, quick and efficient portable systems are now finding a fixed place in the market. On the moveIn today`s energy-hungry world...
Maintaining biodiese quality standards - Case study
A problem that is sometimes encountered with biodiesel blends is inaccurate blend ratios. This article describes a quick analytical method to assess blend ratios and ensure fuel performance According 10 a study` done by the National Renewable Energy Laboratory, the chief problem found with biodiesel blends was inaccurate blend ratios. Retail customers and fleet managers do not typically worry about whether the blend ratio is correct until a problem occurs. For fleet managers, thrs can mean a total shutdown of...
NBB Announces New Report On Biodiesel Benefits
On January 22, 2018, the National Biodiesel Board (NBB) announced that a new study on lifecycle energy and greenhouse gas (GHG) emission effects of biodiesel updates and reaffirms the benefits of using the renewable fuel. The report was published jointly by ANL, Purdue University, and the U.S. Department of Agriculture (USDA). Researchers gathered data on the energy and emissions from farming soybeans, the feedstock for approximately half of U.S. biodiesel. Among the data collected was the largest survey of...
WTO Rules on EU AD Measures On Biodiesel from Indonesia
On January 25, 2018, the World Trade Organization (WTO) issued a ruling on anti-dumping (AD) measures on biodiesel from Indonesia, following Indonesia’s request for consultations with the European Union (EU) in June 2014. The ruling is the latest in a series of legal challenges to EU AD duties on biodiesel imports from Indonesia and Argentina that were established in 2013. Similar to the WTO ruling for Argentina, the panel ruled in favor of several challenges to the AD duties for Indonesia. For instance,...
Odor Control at Biodiesel Plant - Case study
Customized ozone solution from Primozone proves to be the key to removing odor created by biodiesel plant in Lithuania. Mestilla is an environmentally friendly producer of biodiesel. The biodiesel is produced from vegetable (canola) oil and during the process of pressing the oil a distinctive smell of hydrogen sulfide is formed. This distinctive smell is a nuisance to the neighborhood as the plant is situated in a densely populated area in the port of Klaipeda, Lithuania. Removal of H2S At the Mestilla plant...