Time filter

Source Type

Rivoli, Italy

Battista F.,Polytechnic University of Turin | Fino D.,Polytechnic University of Turin | Erriquens F.,Asja Ambiente Italia Spa | Mancini G.,University of Catania | Ruggeri B.,Polytechnic University of Turin
Renewable Energy | Year: 2015

The most abundant agro-food wastes in Puglia (Italy) are derived either from olive oil production, e.g., olive pomace (OP) and olive mill wastewaters (OMW), or from diary activity, e.g., milk whey. All of these wastes have an acidic pH (3.5-5.5), high organic matter volatile solids, a (VS) higher than 50g/L, and chemical substances such as total nitrogen (TN), total ammonia (TAN) and total phosphorous (TP), which are able to alter the properties of the soil and pollute aquifers in scenarios where they were released into the ground without any treatment. Two types of OP exist but have different chemical characteristics: OP from a two phase centrifugation (OPII) and OP from a three phase centrifugation (OPIII). These differ primarily in their water content, which is higher in OPIII, and in their polyphenol and ammonia content. In the present work, two mixtures of wastes from olive oil and dairy production were prepared and initially tested in a 50L batch digester. Then, in a scaled up 2m3 anaerobic reactor a test in continuous mode was realized. Two feeds were tested: a first mixture containing OPII and a second mixture with OPIII. The tests were conducted in mesophilic conditions (35°C) with a total solid (TS) content of approximately 10%w/w in continuous mode. The test including OPIII showed a productivity of 1.23LCH4/Ld against 0.83LCH4/Ld for the test with OPII, as a consequence of the higher organic content and the simultaneous effect of the minor inhibitory compound (ammonia and polyphenols) concentration in OPIII. © 2015 Elsevier Ltd. Source

Gianico A.,CNR Water Research Institute | Braguglia C.M.,CNR Water Research Institute | Mescia D.,Asja Ambiente Italia Spa | Mininni G.,CNR Water Research Institute
Bioresource Technology | Year: 2013

Olive husks, typical solid by-products from the olive oil industry, were selected to carry out anaerobic digestion tests. Before digestion, olive husks were subjected to ultrasonic or thermal pretreatments in order to release the organic matter into solution. Both sonication and thermal pretreatment allowed to solubilize the particulate matter with 22% and 72% increase in soluble organics of olive husks, respectively. Nevertheless, such pretreatments caused the release of unwanted molecules in solution, with the related risks of inhibition of the methanogenic process. Biochemical Methane Potential (BMP) tests on olive husks mixed with olive-mill wastewater and dairy wastewater, either pretreated or not, showed that ultrasound pretreatment resulted in 15% increase in volatile solids reduction and a 13% increase in biogas production, while after thermal pretreatment no benefits were observed. © 2013 Elsevier Ltd. Source

Battista F.,Polytechnic University of Turin | Ruggeri B.,Polytechnic University of Turin | Fino D.,Polytechnic University of Turin | Erriquens F.,Asja Ambiente Italia Spa | And 2 more authors.
Journal of Environmental Chemical Engineering | Year: 2013

Olive oil and dairy production are among the most important and widespread agro-food activities in southern Italy and particularly in the Puglia region. According to a territorial survey of the Puglia region, the related wastes, olive pomace (OP), olive mill wastewater (OMWW) and whey milk are very abundant (741,000 tons/year) and represent potential sources of contamination for the land and aquifers; however, these wastes also represent an interesting feedstock for biogas production through anaerobic digestion. OP, OMWW and whey milk are high in organic content (100 g/l, 65 g/l and 60 g/l, respectively), are acidic (with pH values between 3.5 and 5.5), and have high total solid percentage concentrations (30% (w/w), <5% (w/w) and 5% (w/w), respectively). In this study, the results of two experimental campaigns, both conducted at Asja Ambiente's research center in Ceglie Messapica (Italy) are reported. In the first campaign, different waste mixtures obtained from OP, OMWW and whey milk were fed into a 45-L anaerobic reactor to evaluate their biogas yields. In the second campaign, a combination of whey milk and OP was fed into an anaerobic pilot plant with a volume of 1.6 m3. In the case of feed composed of 25% (w/w) OP and 75% (w/w) whey, a Chemical Oxygen Demand (COD) reduction of 64% and a biogas production of approximately 1.3 L/L day were obtained, which correspond to 0.013 Lbiogas/gTSin. This performance is potentially able to cover 0.015% of Puglia's yearly total demand for energy. © 2013 Elsevier Ltd. All rights reserved. Source

Discover hidden collaborations