A. P. Oliveira Articles | Environmental XPRT

RFID technology as cost-effective real-time process monitoring and control tool in continuous sand filters: two case studies

The legislative norms for treated wastewater discharge in terms of nitrogen (N) and phosphorus (P concentrations are becoming increasingly stringent in the EU region. Compliance with the consent values compelled the water authorities to implement moving bed biofilters (MBFs) for tertiary stage effluent polishing. However, on-site and field surveys reveal that numerous MBF units suffer from ...

Feb. 26, 2021

By BW Products BV

Comparison of earthworm and chemical assays of the bioavailability of aged 1,1‐dichloro‐2,2‐bis(p‐chlorophenyl)ethylene, 1,1,1‐trichloro‐2,2‐bis(p‐chlorophenyl)ethane, and heavy metals in orchard soils

Orchard soils can contain elevated concentrations of 1,1‐dichloro‐2,2‐bis(p‐chlorophenyl)ethylene (p,p′‐DDE), 1,1,1‐trichloro‐2,2‐bis(p‐chlorophenyl)ethane (p,p′‐DDT), and heavy metals as a result of historical agrichemical applications. The bioavailability of p,p′‐DDE, p,p′‐DDT, As, Cd, Cu, and Pb from five field‐aged New Zealand orchards and three grazing soils was assessed by using a 28‐d ...

Apr. 19, 2012

By John Wiley & Sons, Ltd.

Sequential fractionation of phosphorus in lake sediments of Northern Greece

The amounts and forms of potentially mobile P in surface sediments from two lakes, Volvi and Koronia, located in Northern Greece were evaluated using a sequential chemical extraction. Five sedimentary P reservoirs were separately quantified: loosely sorbed P (NH4Cl-P), iron associated P (BD-P), calcium bound P (HCl-P), metal oxide bound P (NaOH-P) and residual P (organic and refractory P). ...

Jan. 1, 2005

By Springer-Verlag GmbH

Vermicomposting of domestic waste by using two epigeic earthworms (Perionyx excavatus and Perionyx sansibaricus)

The composting potential of two epigeic earthworms (P. excavatus and P. sansibaricus) was studied in 2002 to breakdown the domestic waste under laboratory conditions. The experimental container with P. sansibaricus showed maximum mineralization and decomposition rate than that of P. excavatus. Except for exchangeable K (it was higher (P = 0.004) in a container with P. excavatus), the domestic ...

Dec. 26, 2007

By Center for Environment and Energy Research & Studies (CEERS)

The longer-term phytoavailability of biosolids-phosphorus

Phosphorus based nutrient management could limit biosolids application to rates based on crop fertilizer P recommendations (P-based rates). Determinations of biosolids P phytoavailability relative to inorganic P fertilizers are necessary when P-based rates are mandated. Previous shorter-term (≤4 mo) studies successfully distinguished P phytoavailability differences among biosolids, but the ...

Jul. 17, 2009

By Soil Science Society of America (SSSA)

Leaching of dissolved phosphorus from tile-drained agricultural areas

We investigated leaching of dissolved phosphorus (P) from 45 tile-drains representing animal husbandry farms in all regions of Denmark. Leaching of P via tile-drains exhibits a high degree of spatial heterogeneity with a low concentration in the majority of tile-drains and few tile-drains (15% in our investigation) having high to very high concentration of dissolved P. The share of dissolved ...

Mar. 24, 2016

By IWA Publishing

$Comparison of phosphorus fraction distribution and influencing factors of suspended and surface sediments in the Tiaoxi watershed, China$

Comparison of phosphorus fraction distribution and influencing factors of suspended and surface sediments in the Tiaoxi watershed, China

Suspended and surface sediments from the Tiaoxi watershed, fed by the Xitiaoxi and Dongtiaoxi rivers, were analyzed for total phosphorus (TP) and the inorganic P fractions of loosely adsorbed P that were extractable with NH4Cl (NH4Cl-P), reductant P (BD-P), metal oxide-bound P extractable with NaOH (NaOH-P), and calcium-bound, HCl-extractable P (HCl-P), while other physicochemical ...

Feb. 16, 2017

By IWA Publishing

Are current phosphorus risk indicators useful to predict the quality of surface waters in Southern Manitoba, Canada?

Received for publication April 6, 2008. Many phosphorus (P) risk indicators have been developed to assess the risk of P loss from agricultural land to surface water. Most of these indicators are designed for land and climates where rainfall-induced erosion of particulate P from sloping landscapes is the main process of P transport. No indicators have been validated in the Canadian Prairies, where ...

Aug. 24, 2009

By Soil Science Society of America (SSSA)

What is the dry time of P-80®? (And, why it matters)

Why does dry time matter? P-80® lubricants are temporary assembly lubricants. When P-80 is wet it provides the needed lubrication to reduce the friction of rubber parts during assembly. Once P-80 dries the lubrication ceases and parts stay in place. Some assembly applications may benefit from using a quick-drying lubricant. This is often the case in processes where pressure testing takes ...

Jun. 28, 2017

By International Products Corporation

Treatability and fate of various phosphorus fractions in different wastewater treatment processes

The increasingly more stringent phosphorus (P) discharge limits, which are below the concentrations reliably achievable with currently available technologies, demand for better understanding of phosphorus removal mechanisms. This study investigated the compositional fractions of phosphorus (P) in various effluents as well as the efficacy of different levels of treatment processes for removing ...

Feb. 1, 2011

By IWA Publishing

Availability of different phosphorus forms in agricultural soil to Microcystis aeruginosa

We investigated the availability of different forms of particulate soil phosphorus (P) to Microcystis aeruginosa by sequential extraction and bioassay. We cultured M. aeruginosa in media containing, as the sole source of P, soils sequentially extracted with 1 M NH4Cl, 0.11 M bicarbonate dithionite, 1 M NaOH, and 0.5 M HCl. Analyses of chlorophyll-a, particulate organic carbon, and particulate ...

Mar. 19, 2014

By IWA Publishing

$Distributions of phosphorus fractions in the sediments of a river–lake system: a case study in Huai River catchment area, China$

Distributions of phosphorus fractions in the sediments of a river–lake system: a case study in Huai River catchment area, China

Phosphorus (P) forms, with respect to sediment characteristics, and an in-stream sluice were studied in the river–lake system, Huai River catchment area, China. The mean of total P in sediments in the mainstream of the Huai River was higher than that in the Hongze Lake. It was found that P fractions varied in the sediments throughout the river and lake. Detrital-P was the dominant P ...

Aug. 19, 2015

By IWA Publishing

Use of solid phase microextraction to estimate toxicity: Relating fiber concentrations to toxicity—part I

Use of solid‐phase microextraction (SPME) fibers as a dose metric for toxicity testing was evaluated for hydrophobic pesticides to the midge Chironomus dilutus and the amphipod Hyalella azteca. Test compounds included p,p'‐dichlorodiphenyltrichloroethane (p,p'‐DDT), p,p'‐dichlorodiphenyldichloroethane (p,p'‐DDD), p,p'‐dichlorodiphenyldichloroethylene (p,p'‐DDE), permethrin, bifenthrin, ...

Jul. 6, 2012

By John Wiley & Sons, Ltd.

Three experimental systems to evaluate phosphorus supply from enhanced granulated manure ash

Three experimental systems were used to evaluate a new P fertilizer since residual P levels at typical farm sites may make response detection unlikely. The systems were (i) greenhouse with low P soil, (ii) long-term research sites with preexisting soil P gradients, and (iii) agricultural fields with prior P fertilization based on agronomic recommendations. The new fertilizer (animal waste ...

Jul. 17, 2009

By Soil Science Society of America (SSSA)

Stoichiometry in an ecological context: testing for links between Daphnia P-content, growth rate and habitat preference

We used laboratory experiments with ten Daphnia taxa to test for links between Daphnia P-content, growth rate and habitat preference. The taxa represent a wide range of body sizes and most show distinct preferences for one of three habitats: shallow lakes, deep, stratified lakes or fishless ponds. Previous studies show that taxa from shallow lakes and fishless ponds experience high predation risk ...

Apr. 1, 2005

By Springer-Verlag GmbH

Efficacy of drinking-water treatment residual in controlling off-site phosphorus losses: A field study in Florida

Received for publication August 23, 2008. Land application of drinking-water treatment residuals (WTR) has been shown to control excess soil soluble P and can reduce off-site P losses to surface and ground water. To our knowledge, no field study has directly evaluated the impacts of land application of WTRs on ground water quality. We monitored the effects of three organic sources of P (poultry ...

Mar. 25, 2009

By Soil Science Society of America (SSSA)

Phosphorus release and retention by soils of natural isolated wetlands

Hydrological restoration of historically isolated wetlands may mitigate phosphorus (P) loss. The objectives of this study were to quantify P in soil, and to determine the effect of (1) soil characteristics on P release, and (2) antecedent soil hydrological conditions on P dynamics. Humic/fulvic acid bound P and residual P accounted for majority of P (>78%) in surface soils. Soils with highest ...

Nov. 7, 2006

By Inderscience Publishers

Production of p-Methylstyrene and p-Divinylbenzene from Furanic Compounds

A four-step catalytic process was developed to produce p-methylstyrene from methylfuran, a biomass-derived species. First, methylfuran was acylated over zeolite H-Beta with acetic anhydride. Second, the acetyl group was reduced to an ethyl group with hydrogen over copper chromite. Third, p-ethyltoluene was formed through Diels–Alder cycloaddition and dehydration of 2-ethyl-5-methyl-furan ...

Dec. 20, 2016

By SusChem

Evaluating Phosphorus release from biosolids and manure-amended soils under anoxic conditions

The solubility of P in biosolids and manures has been shown to influence the potential for dissolved P losses in runoff and leachate when these materials are land applied. As a result, some Mid-Atlantic US states have developed P source coefficients (PSCs) to account for differences in P solubility between fertilizers, manures, and biosolids in P risk assessment tools. The reliability of these ...

Jan. 13, 2009

By Soil Science Society of America (SSSA)

Distribution and mass inventory of total dichlorodiphenyldichloroethylene in the water column of the Southern California Bight.

Untitled Document A large-scale survey on the area and depth stratified distribution of dichlorodiphenyltrichloroethane (DDT; mainly p,p¢- and o,p¢-dichlorodiphenyldichloroethylene (DDE)) contamination in the water column of the Southern California Bight (SCB) was conducted in 2003-2004 using a solidphase microextraction-based sampling technique. Dissolvedphase ...

Jan. 1, 2005

By Southern California Coastal Water Research Project Authority (SCCWRP)

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