Lanthanum (La) bearing materials have been widely used to remove phosphorus (P) in water treatment. However, it remains a challenge enhance phosphate (PO4) adsorption capacity and La usage efficiency. In this study, was coprecipitated with aluminum (Al) obtain La/Al–hydroxide composite (LAH) for P adsorption. The maximum PO4 capacities of LAH (5.3% La) were 76.3 45.3 mg g–1 at pH 4.0 8.5, which 8.5 5.3 times higher than those commercially available La-modified bentonite (Phoslock, 5.6% La),...

Estimates of the sources and wet deposition fluxes inorganic nutrients (PO 4 3− , NO 3 − 2 NH + ) have been made using a long‐term atmospheric measurement at three sites along Mediterranean coast Israel. The nutrient composition in rainwater indicated dominant anthropogenic source for continental, natural, anthropogenic, rock/soil PO . calculated dissolved N (IN) P (IP) were 0.28 0.009 g m −2 yr −1 to coastal zone estimated as 0.24 0.008 Southeast (SE) Mediterranean, with possible increasing...

Red mud leachate (pH 13) collected from Ajka, Hungary is neutralized to < pH 10 by HCl, gypsum, or seawater addition. During acid neutralization >99% Al removed solution during the formation of an amorphous boehmite-like precipitate and dawsonite. Minor amounts As (24%) are also via surface adsorption onto oxyhydroxides. Gypsum addition red results in precipitation calcite, both experiments field samples recovered rivers treated with gypsum after October 2010 spill. Calcite 86% 81% removal...

Background Invasive predators may change the structure of invaded communities through predation and competition with native species. In Europe, invasive signal crayfish Pacifastacus leniusculus is excluding white clawed Austropotamobius pallipes. Methodology Principal Findings This study compared predatory functional responses prey choice measured impacts parasitism on strength showed a higher (>10%) (Gammarus pulex) intake rate than (size matched) natives, reflecting shorter (16%) handling...

Phosphorus (P) in water and sediment the Yellow River was measured for 21 stations from source to Bohai Sea 2006–2007. The average total particulate matter (TPM) increased 40 mg/L (upper reaches) 520 (middle 950 lower reaches of river. dissolved PO4 concentration (0.43 μmol/L) significantly higher than that 1980's but world level despite high nutrient input system. Much P removed by adsorption, which due TPM rather surface activity particles since they had low labile Fe affinity P. a sink...

Rising concentrations of atmospheric carbon dioxide are causing acidification the oceans. This results in changes to key chemical species such as hydroxide, carbonate and bicarbonate ions. These will affect distribution different forms trace metals. Using IPCC data for pCO2 pH under four future emissions scenarios (to year 2100) we use a speciation model predict organic inorganic Under scenario where peak after 2100, predicted free ion Al, Fe, Cu, Pb increase by factors up approximately 21,...

ADVERTISEMENT RETURN TO ISSUEPREVViewpointNEXTNanobubble Technology in Environmental Engineering: Revolutionization Potential and ChallengesTao LyuTao LyuSchool of Animal, Rural Sciences, Nottingham Trent University, Brackenhurst Campus, Nottinghamshire NG25 0QF, United KingdomCentre Integrated Water-Energy-Food studies (iWEF), KingdomMore by Tao Lyu, Shubiao Wu*Shubiao WuAarhus Institute Advanced Studies, Aarhus Høegh-Guldbergs Gade 6B, DK-8000 C, Denmark*(S.W.) E-mail: [email...

Significance Mineral dust is the most important external source of phosphorus (P), a key nutrient controlling phytoplankton productivity and carbon uptake, to offshore ocean. The bioavailable P in exhibits considerable poorly understood variability. Detailed laboratory experiments elucidate quantify major processes dissolution atmosphere. Dust exposure acids main driver mineral transformations, simple direct proportionality found between amount dissolved from acid exposure. Simulations...

Technetium is a redox active radionuclide, which present as contaminant at number of sites where nuclear fuel cycle operations have been carried out. Recent studies suggest that Tc(VII), soluble under oxic conditions, will be retained in sediments Fe(III)-reducing conditions develop, due to reductive scavenging hydrous TcO2. However, the behavior technetium during subsequent reoxidation remains poorly characterized. Here, we describe microcosm-based approach investigate reduced,...

Basic oxygen furnace (BOF) steelmaking slag is enriched in potentially toxic V which may become mobilized high pH leachate during weathering. BOF was weathered under aerated and air-excluded conditions for 6 months prior to SEM/EDS μXANES analysis determine host phases speciation both primary secondary phases. Leached blocks show development of an altered region free lime dicalcium silicate were absent Ca-Si-H precipitated (CaCO3 also present conditions). analyses that released solution as...

Artificial aeration is a widely used approach in wastewater treatment to enhance the removal of pollutants, however, traditional techniques have been challenging due low oxygen transfer rate (OTR). Nanobubble has emerged as promising technology that utilise nano-scale bubbles achieve higher OTRs owing their large surface area and unique properties such longevity reactive species generation. This study, for first time, investigated feasibility coupling nanobubble with constructed wetlands...

Technetium is a significant radioactive contaminant from nuclear fuel cycle operations. It highly mobile in its oxic form (as Tc(VII)O4-) but scavenged to sediments reduced forms (predominantly Tc(IV)). Here we examine the behavior of Tc at low concentrations and as microbial anoxia develops sediment microcosms. A cascade stable-element terminal-electron-accepting processes developed microcosms due indigenous activity. TcO4- removal solution occurred during active Fe(III) reduction, which...

Diffusive equilibration in thin films was used to study the cycling of phosphorus and nitrogen at sediment−water interface situ with minimal disturbance redox conditions. Soluble reactive phosphate (SRP), nitrate, nitrite, ammonium, sulfate, iron, manganese profiles were measured a rural stream, 12 m upstream, adjacent to, 8 downstream septic tank discharge. Sewage fungus discharge resulted anoxic conditions directly above sediment. SRP ammonium increased depth through layer environmentally...

The tailings dam breach at the Ajka alumina plant, western Hungary in 2010 introduced ∼1 million m3 of red mud suspension into surrounding area. Red (fine fraction bauxite residue) has a characteristically alkaline pH and contains several potentially toxic elements, including arsenic. Aerobic anaerobic batch experiments were prepared using soils from near order to investigate effects addition on soil biogeochemistry arsenic mobility soil–water representative land affected by spill. XAS...

Red mud is a highly alkaline (pH >12) waste product from bauxite ore processing. The red spill at Ajka, Hungary, in 2010 released 1 million m(3) of caustic into the surrounding area with devastating results. Aerobic and anaerobic batch experiments solid phase extraction techniques were used to assess impact addition on mobility Cu Ni soils near Ajka site. increases aqueous dissolved organic carbon (DOC) concentrations due soil alkalisation, this led increased complexed matter. With soils,...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 276:37-52 (2004) - doi:10.3354/meps276037 Anoxic nitrification in marine sediments Robert J. G. Mortimer1,*, Sansha Harris1, Michael D. Krom1, Thomas E. Freitag2, James I. Prosser2, Jonathan Barnes3, Pierre Anschutz4, Peter Hayes5, Ian M. Davies5 1Earth and Biosphere Institute, School of Earth Sciences,...