Time filter

Source Type

North Andover, MA, United States

Moreno-Jimenez E.,Autonomous University of Madrid | Clemente R.,Organic Waste Management | Mestrot A.,University of Bern | Meharg A.A.,Queens University of Belfast
Environmental Pollution

Organic matter amendments are applied to contaminated soil to provide a better habitat for re-vegetation and remediation, and olive mill waste compost (OMWC) has been described as a promising material for this aim. We report here the results of an incubation experiment carried out in flooded conditions to study its influence in As and metal solubility in a trace elements contaminated soil. NPK fertilisation and especially organic amendment application resulted in increased As, Se and Cu concentrations in pore water. Independent of the amendment, dimethylarsenic acid (DMA) was the most abundant As species in solution. The application of OMWC increased pore water dissolved organic-carbon (DOC) concentrations, which may explain the observed mobilisation of As, Cu and Se; phosphate added in NPK could also be in part responsible of the mobilisation caused in As. Therefore, the application of soil amendments in mine soils may be particularly problematic in flooded systems. © 2012 Elsevier Ltd. All rights reserved. Source

Gell K.,Wageningen University | van Groenigen J.,Wageningen University | Cayuela M.L.,Wageningen University | Cayuela M.L.,Organic Waste Management
Journal of Hazardous Materials

The current shift towards bioenergy production increases streams of bioenergy rest-products (RPs), which are likely to end-up as soil amendments. However, their impact on soil remains unclear. In this study we evaluated crop phytotoxicity of 15 RPs from common bioenergy chains (biogas, biodiesel, bioethanol and pyrolysis). The RPs were mixed into a sandy soil and the seedling root and shoot elongation of lettuce ( Lactuca sativa L.), radish ( Raphanus sativus L.), and wheat ( Triticum aestivum L.) were measured. Immediate phytotoxic effects were observed with biodiesel and bioethanol RPs (root elongation reduced to 14-60% for the three crops; P< 0.05). However, phytotoxicity was no longer significant after seven days. Digestates had no phytotoxic effect whereas biochars ranged from beneficial to detrimental depending on the original feedstock and temperature of pyrolysis. Biochar amendment alleviated phytotoxicity of bioethanol by-products for wheat and radish. Phytotoxicity assessment is critical for successful soil amendment with bioenergy RPs. © 2010 Elsevier B.V. Source

Organic Waste Management | Date: 2015-01-29

The invention provides a system and method for processing at least one document thereby rendering the document illegible; and recording an information summary associated with the document and the processing of the document.

Lopez-Mondejar R.,Organic Waste Management | Ros M.,Organic Waste Management | Pascual J.A.,Organic Waste Management
Biological Control

The selection of new isolates of Trichoderma harzianum with high suppressive activity against Fusarium oxysporum is a suitable strategy to avoid the increase of chemical pesticides. In this study, 31 isolates of Trichoderma sp. were analyzed by RAPD-PCR and five isolates of T. harzianum (T-30, T-31, T-32, T-57 and T-78) were selected. The expression of genes encoding for NAGases (exc1 and exc2), chitinases (chit42 and chit33), proteases (prb1) and β-glucanases (bgn13.1) activities and their respective in vitro enzymatic activities were measured. Dual plate confrontation assays of the isolates against F. oxysporum were also tested. Different profiles of gene expression between the different T. harzianum isolates were related to enzymatic activities values and dual plate confrontation. In this work, the T. harzianum isolates T-30 and T-78 showed the greatest mycoparasitic potential against F. oxysporum, which could lead to improved biocontrol of this phytopathogen. © 2010 Elsevier Inc. Source

Alburquerque J.A.,Organic Waste Management | de la Fuente C.,Organic Waste Management | Bernal M.P.,Organic Waste Management
Agriculture, Ecosystems and Environment

The optimisation of digestate recycling as fertilisers, based on both environmental and agricultural criteria, requires an evaluation of the effects on C and N dynamics in soil. In the present paper, six digestates from several anaerobic co-digestion experiments, using pig or cattle slurry as the main substrate, were evaluated in short-term incubations in soil.Digestate properties such as dissolved organic-C (DOC), biochemical oxygen demand (BOD) and digestate organic-C mineralised in the soil during the first 7 days represented properly the digestate biodegradability. These, together with their ratios with respect to the total nitrogen (TN) concentration in the digestate, were reliable parameters with respect to defining the C and N dynamics in the soil and hence the N-fertiliser potential of the digested materials. Therefore, highly biodegradable digested materials, represented in the present study by digestates from cattle slurry-glycerine mixtures were not suitable for agricultural use as they caused a high CO 2-C production and led to N-immobilisation and/or denitrification after their application to soil. Contrastingly, for less biodegradable digested materials (BOD 5d<6.0gO 2L -1 fresh weight, DOC<5.5gL -1 fresh weight and DOC/TN<1.5), less CO 2-C was evolved and ammonium was rapidly nitrified in soil-being an available N source for crops. © 2011 Elsevier B.V. Source

Discover hidden collaborations