6 documents found, page 1 of 1
Comparison of a variety of physico-chemical techniques in the chronological cha...
Silva, Ana Catarina; Rocha, P.; Antelo, J.; Valderrama, P.; Lopez, R.; Geraldo, Dulce; Proenca, M. F.; Pinheiro, J. P.; Fiol, S.; Bento, M. FátimaThe degree of stability and maturity of the organic matter are fundamental features of the chemical characterization of compost. These characteristics are related to the extensive formation of aromatic structures and of oxygen-containing functional groups. The increase of the amount of these chemical moieties can be assessed by different analytical methodologies, based on thermal, spectrophotometric, and electr...
Factors that affect physicochemical and acid-base properties of compost and ver...
Lopez, R.; Antelo, J.; Silva, Ana Catarina; Bento, M. Fátima; Fiol, S.Composting and vermicomposting have attracted attention in relation to both waste management and the potential to produce organic amendments that could improve soil quality. The main differences between compost depend on the feedstock, the production process, and the degree of maturity. In the present study, samples of compost of different origin (food and green waste, livestock waste, algae waste, urban waste ...
Comparison of cadmium binding by humic and fulvic acids extracted from compost ...
Rocha, P.; Silva, Ana Catarina; Antelo, J.; Bento, M. Fátima; Bettencourt, Ana Paula; Fiol, S.; Geraldo, Dulce; López, R.; Macías, F.; Pinheiro, J. P.Compost is a bio-sustainable material produced by the controlled decomposition of the organic wastes. Composting can be employed for the urban organic waste treatment in alternative to incineration or landfill disposal [1]. The properties of compost are closely related to the presence of humic-like substances (HS). Both fulvic acids (FA) and humic acids (HA) contain a significant amount of carboxylic acids and ...
Comparison of cadmium binding by humic and fulvic acids extracted from two comp...
Silva, Ana Catarina; Rocha, P.; Antelo, J.; Bento, M. Fátima; Bettencourt, Ana Paula; Fiol, S.; Geraldo, Dulce; López, F.; Macías, F.; Pinheiro, J. P.Composting has been proven to be an environmentally friendly process for urban organic waste, that can represent an opportunity for new uses under the circular economy framework. The binding of cadmium to fulvic-like and humic-like acids extracted from compost of algae and urban residues were evaluated, and the results show significant differences. The fulvic and humic acids from algae compost bind cadmium more...
Characterization of organic matter at different stages of a composting process
Silva, Ana Catarina; Rocha, P.; Antelo, J.; Bento, M. Fátima; Bettencourt, Ana Paula; Ferreira, Paula M. T.; Fiol, S.; Geraldo, Dulce; López, R.The characterization of the organic matter from raw organic wastes, unmatured compost and maturated compost was performed by different techniques: gravimetric, FTIR-ATR, TGA and from the ability of their extracts to bind Cd2+ (evaluating the free cadmium ion by AGNES). Although the amount of humic-like and fulvic-like acids did not change significantly, the structure and properties of the organic matter changed...
Influence of the feedstock material on the compost maturity, stability and reac...
Silva, Ana Catarina; López, R.; Antelo, J.; Fiol, S.; Macías, F.; Bento, M. Fátima; Ferreira, Paula M. T.; Paiva, M. C.; Proença, M. Fernanda R. P.Compost samples from different origins have been characterized in order to obtain information about their composition, humic-like substances content, maturity and stability. The composts used in the present study were obtained from manure (CAP), algae (CA), domestic waste (VCRU), sewage sludge (CT) and animal waste (CE). Different techniques have been used to gather physical-chemical parameters of the raw compo...