cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.14283687.v1
title: Bioremediation of arsenic-contaminated soil through soil washing using biosurfactants

description: ABSTRACT Gold mining is one of the main sources of Arsenic (As) contamination in Minas Gerais, particularly at the Iron quadrangle. Arsenic is a toxic element that causes damage to human health. The soil washing technique using biosurfactants (BS) containing extracts was tested to promote the mobilization of the As contained in some soil samples collected in an abandoned gold mine, to investigate an environmentally friendly but equally efficient alternative to remove As from soils. Two mixed cultures of biosurfactant-producing bacteria (MPCB and MPBR), both adapted to the cultivation at high As concentrations (8 mg.L-1), were selected for extracts production. Surfactants were stable over a wide pH range, 3-11; temperature, 28-50ºC and salinity, 1-5% NaCl (p.v-1), and promoted the mobilization of As. The pH and solid:liquid ratio influenced the removal efficiency of the tested extracts. The highest removals were obtained at pH 11.0 and a solid:liquid ratio of 1:40 (g.mL-1). Under pH 11.0, the arsenic removal results obtained with MPCB (14.01 and 13.72%) and MPBR extracts (12.04 and 12.31%) were superior to those obtained by using 1% (w/v) solutions of the commercial surfactants SDS (0.87 and 0.71%), saponin (0.57 and 0.55%) and, soy lecithin (2.05 and 2.63%). The pH and the solid: liquid ratio influenced the results of the column tests. The highest As removals: 25.43% (MPCB) and 22.43% (MPBR) were obtained after 10 extraction cycles, at pH 11 and 1:40 ratio (g.mL-1). The extracts MPCB and MPBR removed the water-soluble arsenic as well as the carbonate associated As and the adsorbed ions. Both extracts behaved similarly to EDTA and the commercial microbial extract (GorduraKlin®).
DOI: 10.6084/m9.figshare.14283693
title: Sanitary situation and the use of the water of Santa Cruz Creek, municipality of Breves, Archipelago of Marajó, Pará, Brazil

description: ABSTRACT The aim of this study was to verify and evaluate the sanitary situation and the use and quality of the waters of Santa Cruz creek, in the municipality of Breves, Pará. To obtain the data, a questionnaire was applied to the residents of the creeks waterfronts, which addressed the use of water and sanitary conditions. Water collection was also carried out for bacteriological physical-chemical parameters analysis, in four points of the creek, where two measurements were made for each parameter to be analyzed, one at low tide and one at high, in August 2017. The Pearson correlation test was applied between the physical-chemical and bacteriological variables, using the Bioestat 5.3 software. Among the 257 families interviewed, 175 (68.09%) used water from the stream for domestic use, 106 (41.24%) stated that the main leisure activity for children is recreation in the waters of the igarapé and 35 (13.62%) families dump their fecal waste directly into the stream. The mean dissolved oxygen value was 2 mg/L at low tide and 4.1 mg/L at high tide. The mean values for pH are between 6.1 at low tide and 7.0 at high tide. The mean coliform concentration detected at low tide was 101,809 NMP/100 mL for total coliforms, 47,654 NMP/100 mL for thermotolerant coliforms and 24,970 NMP/100 mL for E. coli. High tide the averages were 49,639 NMP/100 mL for total coliforms, 19,994 NMP/100 mL for thermotolerant coliforms and 4,462 NMP/100 mL for E. coli. It was concluded that the population residing near Santa Cruz creek lives in a situation of vulnerability and health risk.
DOI: 10.6084/m9.figshare.14283693.v1
title: Sanitary situation and the use of the water of Santa Cruz Creek, municipality of Breves, Archipelago of Marajó, Pará, Brazil

description: ABSTRACT The aim of this study was to verify and evaluate the sanitary situation and the use and quality of the waters of Santa Cruz creek, in the municipality of Breves, Pará. To obtain the data, a questionnaire was applied to the residents of the creeks waterfronts, which addressed the use of water and sanitary conditions. Water collection was also carried out for bacteriological physical-chemical parameters analysis, in four points of the creek, where two measurements were made for each parameter to be analyzed, one at low tide and one at high, in August 2017. The Pearson correlation test was applied between the physical-chemical and bacteriological variables, using the Bioestat 5.3 software. Among the 257 families interviewed, 175 (68.09%) used water from the stream for domestic use, 106 (41.24%) stated that the main leisure activity for children is recreation in the waters of the igarapé and 35 (13.62%) families dump their fecal waste directly into the stream. The mean dissolved oxygen value was 2 mg/L at low tide and 4.1 mg/L at high tide. The mean values for pH are between 6.1 at low tide and 7.0 at high tide. The mean coliform concentration detected at low tide was 101,809 NMP/100 mL for total coliforms, 47,654 NMP/100 mL for thermotolerant coliforms and 24,970 NMP/100 mL for E. coli. High tide the averages were 49,639 NMP/100 mL for total coliforms, 19,994 NMP/100 mL for thermotolerant coliforms and 4,462 NMP/100 mL for E. coli. It was concluded that the population residing near Santa Cruz creek lives in a situation of vulnerability and health risk.
DOI: 10.6084/m9.figshare.14283694
title: Scheelite mines soils as sources of heavy metal contamination

description: ABSTRACT Heavy metals contribution is inherent to mining activity, however the absence of pollution control measures in mined areas contributes to the expansion of the contamination potential of soil, water, and organisms. The aim of this work was to evaluate the effect of exposure time of tailings and overburden deposition without environmental protection measures over soil heavy metal contamination stage in scheelite mines. Soil samples were obtained from 0-20 cm depth in active scheelite mine and in deactivated scheelite mine since four decades ago. Soil samples were submitted to analyses of particle-size, pH and contents of heavy metals Fe, Mn, Cr, Ni, Cd, Cu, Zn, and Pb. The increases of heavy metals contents at similar levels in active and deactivated mines indicate that even a smaller exposure time of overburden and tailings has a harmful effect when environmental protection and recovery measures were not adopted. These increases alert to the contamination risk of adjacent areas due to wind erosion and hydric erosion during the intermittent rainy events of semi-arid region. Cd, Cu, and Pb contents higher than values of agricultural investigation indicate that there is a risk to human health and that there is need for remediation of mined areas.
DOI: 10.6084/m9.figshare.14283694.v1
title: Scheelite mines soils as sources of heavy metal contamination

description: ABSTRACT Heavy metals contribution is inherent to mining activity, however the absence of pollution control measures in mined areas contributes to the expansion of the contamination potential of soil, water, and organisms. The aim of this work was to evaluate the effect of exposure time of tailings and overburden deposition without environmental protection measures over soil heavy metal contamination stage in scheelite mines. Soil samples were obtained from 0-20 cm depth in active scheelite mine and in deactivated scheelite mine since four decades ago. Soil samples were submitted to analyses of particle-size, pH and contents of heavy metals Fe, Mn, Cr, Ni, Cd, Cu, Zn, and Pb. The increases of heavy metals contents at similar levels in active and deactivated mines indicate that even a smaller exposure time of overburden and tailings has a harmful effect when environmental protection and recovery measures were not adopted. These increases alert to the contamination risk of adjacent areas due to wind erosion and hydric erosion during the intermittent rainy events of semi-arid region. Cd, Cu, and Pb contents higher than values of agricultural investigation indicate that there is a risk to human health and that there is need for remediation of mined areas.
DOI: 10.6084/m9.figshare.14283699
title: Phages of Sulphate Reducing Bacteria in reactor water from offshore oil wells: tentative method for concentration and purification

description: ABSTRACT The control of microbial growth is an increasing challenge in the production of oil and gas, since the presence of certain bacteria has economic and environmental negative impacts. Sulphate reducing bacteria are particularly problematic, since they are responsible for the biological corrosion associated with the production of hydrogen sulfide, an effect known as souring. The main form of control is the use of biocides; however, this strategy, in addition to requiring continuous application, has proven to be ineffective in the elimination of biofilms and is associated with a high risk of water contamination. Therefore, it is necessary to seek more efficient and specific approaches to microbiological control. The use of bacteriophage viruses meets these needs, because after they multiply, they usually cause cell lysis, releasing new viral particles and preventing the bacteria from proliferating. In view of this, this study proposes to establish a method for the concentration and detection of bacteriophages of Sulphate Reducing Bacteria present in reactor water from oil wells. The samples were collected from two reactors, operated in a batch fed to simulate an oil well. The reactor water samples were first clarified, viruses adsorbed to sediment were eluted and then concentrated by ultracentrifugation. The viral concentrate was then purified with Vertrel-XF. Experimental seeding of P1 myophage in water samples from the reactor revealed a viral recovery rate of 27.7%, compared to the 16% obtained by use of other protocols.
DOI: 10.6084/m9.figshare.14283698
title: Biosolids in the establishment of herbaceous species and in chemical and microbiological attributes in soil impacted by coal mining

description: ABSTRACT This study aims to evaluate the effects of different concentrations of sewage sludge biosolid concentrations, submitted to thermal treatment, in the establishment of herbaceous species (black oats, vetches, and ryegrass) and in the chemical and microbiological attributes of a soil degraded by coal mining. The experiment was installed in an area degraded by coal mining, in Treviso/SC, with treatments composed of concentrations of 0; 6.25; 100; 250; and 500 Mg ha-1 of biosolids, in 2×2 m plots. Species of black oat, vetch, and ryegrass were grown in a consortium manner, evaluating the plant parameters and chemical attributes of the soil at depths 0-5, 5-10, and 10-20 cm. The biosolids provided improvements in soil fertility, such as pH elevation, increased levels available of P, K, and total organic carbon, in addition to not influencing mycorrhizal colonization, basal soil respiration, and root nodulation. The use of biosolid waste as a substrate in degraded areas is an alternative to its final disposal due to the economy when using it as a fertilizer, in addition to the environmental benefits associated with its use.
DOI: 10.6084/m9.figshare.14283699.v1
title: Phages of Sulphate Reducing Bacteria in reactor water from offshore oil wells: tentative method for concentration and purification

description: ABSTRACT The control of microbial growth is an increasing challenge in the production of oil and gas, since the presence of certain bacteria has economic and environmental negative impacts. Sulphate reducing bacteria are particularly problematic, since they are responsible for the biological corrosion associated with the production of hydrogen sulfide, an effect known as souring. The main form of control is the use of biocides; however, this strategy, in addition to requiring continuous application, has proven to be ineffective in the elimination of biofilms and is associated with a high risk of water contamination. Therefore, it is necessary to seek more efficient and specific approaches to microbiological control. The use of bacteriophage viruses meets these needs, because after they multiply, they usually cause cell lysis, releasing new viral particles and preventing the bacteria from proliferating. In view of this, this study proposes to establish a method for the concentration and detection of bacteriophages of Sulphate Reducing Bacteria present in reactor water from oil wells. The samples were collected from two reactors, operated in a batch fed to simulate an oil well. The reactor water samples were first clarified, viruses adsorbed to sediment were eluted and then concentrated by ultracentrifugation. The viral concentrate was then purified with Vertrel-XF. Experimental seeding of P1 myophage in water samples from the reactor revealed a viral recovery rate of 27.7%, compared to the 16% obtained by use of other protocols.
DOI: 10.22008/fk2/oiajvo/lceona
title: al.tif

description: SICE version: Cloud removed, PPGC, SNAP7, pySICEv1.4
DOI: 10.6084/m9.figshare.14283700
title: Environmental risk generated by the use of antibiotics in hospital pediatric wards

description: ABSTRACT Hospital effluents have always been a source of concern for microbiological pollution, but only with the increase in the detection of antibiotics in river waters has there been a need to evaluate the environmental risk generated by hospital effluents. In this context, an environmental risk assessment (ERA) was carried out for 19 antibiotics used in a pediatric inpatient hospital ward for a period of 36 months (June 2013 to May 2016). The main objective of this study was to estimate the environmental risk associated with the use of the selected antibiotics released into the sewage system. The tool used for risk assessment was the Predicted Environmental Concentration (PEC) Phase I and Phase II (EMeA, 2006). Data on population, dispensation, and administration of antibiotics were collected for the calculation of the PEC, reference values of the Predicted no Effect Concentration (PNEC), were obtained from sources in the literature. The Risk Characterization Ratio (RCR), used to characterize the risk, was obtained through the PEC/PNEC ratio. Only four antibiotics presented values below the high-level threshold (RCR &lt; 1), the other fifteen antibiotics presented RCR values corresponding to a high potential for environmental damage, with the highest values being observed for ceftriaxone, piperacycline, tazobactam, ciprofloxacin, vancomycin, and oxacillin. The results showed that there is substantial risk of environmental damage associated with the discharge of these substances into the effluent, representing a significant environmental concern regarding the pattern of antibiotic consumption in hospital pediatric wards.
DOI: 10.6084/m9.figshare.14283700.v1
title: Environmental risk generated by the use of antibiotics in hospital pediatric wards

description: ABSTRACT Hospital effluents have always been a source of concern for microbiological pollution, but only with the increase in the detection of antibiotics in river waters has there been a need to evaluate the environmental risk generated by hospital effluents. In this context, an environmental risk assessment (ERA) was carried out for 19 antibiotics used in a pediatric inpatient hospital ward for a period of 36 months (June 2013 to May 2016). The main objective of this study was to estimate the environmental risk associated with the use of the selected antibiotics released into the sewage system. The tool used for risk assessment was the Predicted Environmental Concentration (PEC) Phase I and Phase II (EMeA, 2006). Data on population, dispensation, and administration of antibiotics were collected for the calculation of the PEC, reference values of the Predicted no Effect Concentration (PNEC), were obtained from sources in the literature. The Risk Characterization Ratio (RCR), used to characterize the risk, was obtained through the PEC/PNEC ratio. Only four antibiotics presented values below the high-level threshold (RCR &lt; 1), the other fifteen antibiotics presented RCR values corresponding to a high potential for environmental damage, with the highest values being observed for ceftriaxone, piperacycline, tazobactam, ciprofloxacin, vancomycin, and oxacillin. The results showed that there is substantial risk of environmental damage associated with the discharge of these substances into the effluent, representing a significant environmental concern regarding the pattern of antibiotic consumption in hospital pediatric wards.
DOI: 10.6084/m9.figshare.14283702
title: Comparison between energy recovery technologies for municipal solid waste and greenhouse gas emissions balance in the city of Rio de Janeiro, RJ, Brazil

description: ABSTRACT The present study analyzes the energy recovery potential of municipal solid waste (MSW) and the resulting greenhouse gas (GHG) emission balance in the city of Rio de Janeiro, Rio de Janeiro, Brazil, based on three alternative technological scenarios. The generation potentials were calculated for waste gas recovery (WGR) to be 363.98 GWhe.year-1 and 0.181 MWhe.t-1, 367.27 GWhe.year-1 and 0.247 MWhe.t-1 for anaerobic biodigestion, and 1.139.33 GWhe.year-1 and 0.459 MWhe.t-1 for incineration. Carbon intensity indicators show that, when only considering GHG emissions from the combustion process, WGR recovery and anaerobic biodigestion present the lowest values, of 7.488.10-4 tCO2eq.MWhe-1, while the value for incineration corresponds to 1.248 tCO2eq.MWhe-1. On the other hand, when considering associated landfill GHG emissions, the indicators in the first two scenarios correspond to 8.191 and 3.552 tCO2eq.MWhe-1, respectively.
DOI: 10.6084/m9.figshare.14283705
title: Effects of coal ash supplementation on aerobic granular sludge cultivated in a simultaneous fill/draw sequencing batch reactor

description: ABSTRACT This study aimed to verify if coal ash, a residue from thermal power plants, could act as a granulation nucleus, cations source, and abrasive element to favor granules formation and stability in aerobic granular sludge (AGS) systems. Two simultaneous fill/draw sequencing batch reactors (SBRs) (R1 and R2) were operated with 6-h cycles, i.e., the filling and drawing phases occurred simultaneously, followed by the reaction and settling phases. R1 was maintained as control, while R2 was supplemented with coal ash (1 g·L-1) on the first day of operation. Granulation was achieved in both reactors, and no significant differences were observed in terms of settleability, biomass retention, morphology, resistance to shear, and composition of the EPS matrix. However, the ash addition did not change the settleability, biomass retention, granule morphology, shear resistance, and extracellular polymeric substances (EPS) content significantly. COD removal was high (≥ 90%), while nitrogen (~50%) and phosphorus (~40%) removals were low, possibly due to the presence of nitrate during the anaerobic phase. With granulation, microbial population profile was altered, mainly at the genus level. In general, the operational conditions had a more considerable influence over granulation than the ash addition. The possible reasons are because the ash supplementation was performed in a single step, the low sedimentation rate of this particular residue, and the weak interaction between the ash and the EPS formed in the granular sludge. These factors appear to have decreased or prevented the action of the ash as granulation nucleus, source of cations, and abrasive element.
DOI: 10.6084/m9.figshare.14283705.v1
title: Effects of coal ash supplementation on aerobic granular sludge cultivated in a simultaneous fill/draw sequencing batch reactor

description: ABSTRACT This study aimed to verify if coal ash, a residue from thermal power plants, could act as a granulation nucleus, cations source, and abrasive element to favor granules formation and stability in aerobic granular sludge (AGS) systems. Two simultaneous fill/draw sequencing batch reactors (SBRs) (R1 and R2) were operated with 6-h cycles, i.e., the filling and drawing phases occurred simultaneously, followed by the reaction and settling phases. R1 was maintained as control, while R2 was supplemented with coal ash (1 g·L-1) on the first day of operation. Granulation was achieved in both reactors, and no significant differences were observed in terms of settleability, biomass retention, morphology, resistance to shear, and composition of the EPS matrix. However, the ash addition did not change the settleability, biomass retention, granule morphology, shear resistance, and extracellular polymeric substances (EPS) content significantly. COD removal was high (≥ 90%), while nitrogen (~50%) and phosphorus (~40%) removals were low, possibly due to the presence of nitrate during the anaerobic phase. With granulation, microbial population profile was altered, mainly at the genus level. In general, the operational conditions had a more considerable influence over granulation than the ash addition. The possible reasons are because the ash supplementation was performed in a single step, the low sedimentation rate of this particular residue, and the weak interaction between the ash and the EPS formed in the granular sludge. These factors appear to have decreased or prevented the action of the ash as granulation nucleus, source of cations, and abrasive element.
DOI: 10.6084/m9.figshare.14283698.v1
title: Biosolids in the establishment of herbaceous species and in chemical and microbiological attributes in soil impacted by coal mining

description: ABSTRACT This study aims to evaluate the effects of different concentrations of sewage sludge biosolid concentrations, submitted to thermal treatment, in the establishment of herbaceous species (black oats, vetches, and ryegrass) and in the chemical and microbiological attributes of a soil degraded by coal mining. The experiment was installed in an area degraded by coal mining, in Treviso/SC, with treatments composed of concentrations of 0; 6.25; 100; 250; and 500 Mg ha-1 of biosolids, in 2×2 m plots. Species of black oat, vetch, and ryegrass were grown in a consortium manner, evaluating the plant parameters and chemical attributes of the soil at depths 0-5, 5-10, and 10-20 cm. The biosolids provided improvements in soil fertility, such as pH elevation, increased levels available of P, K, and total organic carbon, in addition to not influencing mycorrhizal colonization, basal soil respiration, and root nodulation. The use of biosolid waste as a substrate in degraded areas is an alternative to its final disposal due to the economy when using it as a fertilizer, in addition to the environmental benefits associated with its use.
DOI: 10.6084/m9.figshare.14283702.v1
title: Comparison between energy recovery technologies for municipal solid waste and greenhouse gas emissions balance in the city of Rio de Janeiro, RJ, Brazil

description: ABSTRACT The present study analyzes the energy recovery potential of municipal solid waste (MSW) and the resulting greenhouse gas (GHG) emission balance in the city of Rio de Janeiro, Rio de Janeiro, Brazil, based on three alternative technological scenarios. The generation potentials were calculated for waste gas recovery (WGR) to be 363.98 GWhe.year-1 and 0.181 MWhe.t-1, 367.27 GWhe.year-1 and 0.247 MWhe.t-1 for anaerobic biodigestion, and 1.139.33 GWhe.year-1 and 0.459 MWhe.t-1 for incineration. Carbon intensity indicators show that, when only considering GHG emissions from the combustion process, WGR recovery and anaerobic biodigestion present the lowest values, of 7.488.10-4 tCO2eq.MWhe-1, while the value for incineration corresponds to 1.248 tCO2eq.MWhe-1. On the other hand, when considering associated landfill GHG emissions, the indicators in the first two scenarios correspond to 8.191 and 3.552 tCO2eq.MWhe-1, respectively.