152 documents found, page 1 of 16
Nitrogen recovery from agroindustrial wastewater by struvite precipitation in a...
Coura, R.; Rodrigues, A. C.; Ferraz, Ana; Brito, A. G.[Excerpt] Animal manure and slurries produced by the animal breeding sector are still an environmental risk because their high nitrogen content hinders biological treatment processes. In addition, sludge from small wastewater treatment plants (WWTP) has few disposal options if a life cycle approach is considered. In this regard, the recent trend in wastewater processes is to move forward resources recovery opti...
Optimization of fluvial beaches location based on a multi-criteria approach com...
Pinho, José L. S.; Costa, Sérgio; Fernandes, Susana; Brito, A. G.River basin management decisions arecomplex allocation processes that should be based on adequate decision support methodologies aiming at an efficient, rational and integrated use of water resources. The present study presents a site-specificmethodology designed toidentify and to rank potential fluvial beach locationscombininghydrodynamic comfort and water quality indexes. The concept was validated in Cavadori...
Removal of tetracycline from contaminated water by Moringa oleifera seed prepar...
Santos, Andréa F. S.; Matos, M.; Sousa, A. M.; Costa, Cátia; Nogueira, Regina; Teixeira, J. A.; Paiva, Patrícia M. G.; Parpot, PierThe aim of this study was to evaluate tetracycline antibiotic (TA) removal from contaminated water by Moringa oleifera seed preparations. The composition of synthetic water approximate river natural contaminated water and TA simulated its presence as an emerging pollutant. Interactions between TA and protein preparations (extract; fraction and lectin) were also evaluated. TA was determined by solid phase extrac...
Phosphorus removal by a fixed-bed hybrid polymer nanocomposite biofilm reactor
Oliveira, M.; Rodrigues, A. L.; Ribeiro, D. C.; Brito, A. G.; Nogueira, R.; Machado, A. V.Eutrophication is one of the main challenges regarding the ecological quality of surface waters, phosphorus bioavailability being its main driver. In this context, a novel hybrid polymer nanocomposite (HPN-Pr) biofilm reactor aimed at integrated chemical phosphorus adsorption and biological removal was conceived. The assays pointed to removal of 1.2 mg P/g of reactive phosphorus and 1.01 mg P/g of total phospho...
Mineral cycling and pH gradient related with biological activity under transien...
Ribeiro, Daniel; Martins, Gilberto; Nogueira, R.; Brito, A. G.Phosphorus (P) mobility from the sediments to the water column is a complex phenomenon that is generally assumed to be mainly redox sensitive and promoted by anoxic conditions. Thus, artificial aeration of the hypolimnium has been used as a remediation technique in eutrophic water bodies but several times with unexpected disappointing results. To optimize lake restoration strategies, the aim of the present stud...
Evaluation of Moringa oleifera seed flour and clays as clarifying agents of eut...
Santos, Andréa F. S.; Rodrigues, M.; Cardoso, João Miguel Sousa; Rodrigues, A. C.; Teixeira, J. A.; Paiva, Patrícia M. G.; Coelho, L. C. B. B.Eutrophication is an environmental dysfunction which causes the proliferation of algae in aquatic ecosystems by excess of nutrients. Moringa oleifera seeds are used as natural coagulant to water treatment. In order to mitigate the eutrophication, clays can be added to the water promoting the removal of organic matter and/or nutrients. In this work M. oleifera seed flour and different clays were assayed to treat...
Use of filamentous fungi for improving electricity production and textile dye t...
Ottoni, C. A.; Peixoto, L.; Maiorano, A. E.; Brito, A. G.Urban and industrial wastewaters have received an increased interest towards energy harvesting using microbial fuel cells (MFC). The combined use of microbial anode oxidizing organic substrates and enzymatic cathode reducing oxygen is a promising new approach for the simultaneous treatment of wastewater and generation of electricity. In this context, our study evaluated the performance of a two-chambered MFC op...
A poly-caprolactone based biofilm carrier for nitrate removal from water
Rodrigues, A. L.; Machado, A. V.; Nóbrega, J. M.; Albuquerque, A.; Brito, A. G.; Nogueira, R.Nitrate removal from water has been accomplished by heterotrophic biofilms using organic carbon as a source of reducing power. To overcome the natural limitation in organic carbon in water, a poly--caprolactone based biofilm carrier that serves simultaneously as a biofilm carrier and as a source of organic carbon was developed and tested in the present work. The feasibility of the new biofilm carrier for nitrat...
Phosphorus–iron interaction in sediments : can an electrode minimize phosphorus...
Martins, Gilberto; Peixoto, L.; Brito, A. G.; Nogueira, R.All restoration strategies to mitigate eutrophication depend on the success of phosphorus (P) removal from the water body. Therefore, the inputs from the watershed and from the enriched sediments, that were the sink of most P that has been discharged in the water body, should be controlled. In sediments, iron (hydr)oxides minerals are potent repositories of P and the release of P into the water column may occur...
Impact of an external electron acceptor on phosphorus mobility between water an...
Martins, Gilberto; Peixoto, L.; Teodorescu, S.; Parpot, Pier; Nogueira, R.; Brito, A. G.The present work assessed the impact of an external electron acceptor on phosphorus fluxes between water-sediment interface. Microcosm experiments simulating a sediment microbial fuel cell (SMFC) were carried out and phosphorus was extracted by an optimized combination of three methods. Despite the low voltage recorded, ∼96 mV (SMFC with carbon paper anode) and ∼146 mV (SMFC with stainless steel scourer anode),...