Journal of environmental health science & engineering最新文献

{"title":"Association of urinary bisphenol a concentration with type-2 diabetes mellitus.","authors":"Reza Ahmadkhaniha,&nbsp;Masoumeh Mansouri,&nbsp;Masud Yunesian,&nbsp;Kobra Omidfar,&nbsp;Maryam Zare Jeddi,&nbsp;Bagher Larijani,&nbsp;Alireza Mesdaghinia,&nbsp;Noushin Rastkari","doi":"10.1186/2052-336X-12-64","DOIUrl":"https://doi.org/10.1186/2052-336X-12-64","url":null,"abstract":"<p><strong>Background: </strong>Bisphenol A as an endocrine-disrupting chemical is widely used chemical in the manufacture of polycarbonate plastics and epoxy resin and has become ubiquitous environmental contaminants. Human exposure to Bisphenol A is widespread and recent studies have been shown to be associated with a higher risk for self-reported adverse health outcomes that may lead to insulin resistance and the development of type-2 diabetes mellitus. In this context, we sought to confirm the association between Bisphenol A and diabetes in a community-based analysis of Bisphenol A urinary concentrations investigation in adult population of Iran.</p><p><strong>Methods: </strong>Regression models were adjusted for age, sex, Body Mass Index, serum triglyceride level and serum cholesterol level and serum creatinine concentration. Main outcomes were reported diagnoses of diabetes that defined according the latest American Diabetes Association guidelines.</p><p><strong>Results: </strong>The median age of the 239 participants was 51.65 years and 119 people had type-2 diabetes mellitus. Urinary Bisphenol A was categorized into two groups based on the median for Bisphenol A (≤0. 85 to >0.85 μg/L). The results of statistical analysis revealed a clear association between hypertension, and type 2 diabetes (P < 0.05). The multi variable-adjusted odds ratio for type-2 diabetes mellitus associated with the group 1 (referent), of urinary Bisphenol A was 57.6 (95% confidence interval: 21.10-157.05; P-value < 0.001). A positive correlation between HbA1c and urinary BPA concentration was observed (r = 0.63, P = 0.001).</p><p><strong>Conclusions: </strong>Urinary Bisphenol A levels are found to be associated with diabetes independent of traditional diabetes risk factors. Higher Bisphenol A exposure, reflected in higher urinary concentrations of Bisphenol A, is consistently associated with diabetes in the general adult population of the Iran. Studies to clarify the mechanisms of these associations are urgently needed.</p>","PeriodicalId":520669,"journal":{"name":"Journal of environmental health science & engineering","volume":" ","pages":"64"},"PeriodicalIF":3.4,"publicationDate":"2014-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/2052-336X-12-64","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40306734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Kinetics and thermodynamic studies for removal of acid blue 129 from aqueous solution by almond shell.","authors":"Mohammad Reza Fat'hi,&nbsp;Arash Asfaram,&nbsp;Anahita Hadipour,&nbsp;Mostafa Roosta","doi":"10.1186/2052-336X-12-62","DOIUrl":"https://doi.org/10.1186/2052-336X-12-62","url":null,"abstract":"<p><p>Efficiency and performance of Almond shell (AS) adsorbent for the removal and recovery of Acid Blue 129 (AB129) from wastewater is presented in this report. The influence of variables including pH, initial dye concentration, adsorbent dosage, particle size, contact time and temperature on the dye removal have been investigated in batch method by one at a time optimization method. The experimental equilibrium data were tested by four widely used isotherm models namely, Langmuir, Freundlich, Tempkin and Dubinin-Radushkevich (D-R). It was found that adsorption of AB129 on AS well with the Langmuir isotherm model, implying monolayer coverage of dye molecules onto the surface of the adsorbent. More than 98% removal efficiency was obtained within 14 min at adsorbent dose of 0.4 g for initial dye concentration of 40 mg/L at pH 2. Kinetics of the adsorption process was tested by pseudo-first-order and pseudo-second-order kinetics, and intraparticle diffusion mechanism. Pseudo-second-order kinetic model provided a better correlation for the experimental data studied in comparison to the pseudo-first-order model. Calculation of various thermodynamic parameters such as, Gibb's free energy, entropy and enthalpy of the on-going adsorption process indicate feasibility and endothermic nature of AB129 adsorption on all adsorbents. This work can be used in design of adsorption columns for dyes removal. </p>","PeriodicalId":520669,"journal":{"name":"Journal of environmental health science & engineering","volume":" ","pages":"62"},"PeriodicalIF":3.4,"publicationDate":"2014-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/2052-336X-12-62","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40303174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biosorption of malachite green from aqueous solutions by Pleurotus ostreatus using Taguchi method.","authors":"Zhengsuo Chen,&nbsp;Hongbo Deng,&nbsp;Can Chen,&nbsp;Ying Yang,&nbsp;Heng Xu","doi":"10.1186/2052-336X-12-63","DOIUrl":"https://doi.org/10.1186/2052-336X-12-63","url":null,"abstract":"<p><p>Dyes released into the environment have been posing a serious threat to natural ecosystems and aquatic life due to presence of heat, light, chemical and other exposures stable. In this study, the Pleurotus ostreatus (a macro-fungus) was used as a new biosorbent to study the biosorption of hazardous malachite green (MG) from aqueous solutions. The effective disposal of P. ostreatus is a meaningful work for environmental protection and maximum utilization of agricultural residues.The operational parameters such as biosorbent dose, pH, and ionic strength were investigated in a series of batch studies at 25°C. Freundlich isotherm model was described well for the biosorption equilibrium data. The biosorption process followed the pseudo-second-order kinetic model. Taguchi method was used to simplify the experimental number for determining the significance of factors and the optimum levels of experimental factors for MG biosorption. Biosorbent dose and initial MG concentration had significant influences on the percent removal and biosorption capacity. The highest percent removal reached 89.58% and the largest biosorption capacity reached 32.33 mg/g. The Fourier transform infrared spectroscopy (FTIR) showed that the functional groups such as, carboxyl, hydroxyl, amino and phosphonate groups on the biosorbent surface could be the potential adsorption sites for MG biosorption. P. ostreatus can be considered as an alternative biosorbent for the removal of dyes from aqueous solutions. </p>","PeriodicalId":520669,"journal":{"name":"Journal of environmental health science & engineering","volume":" ","pages":"63"},"PeriodicalIF":3.4,"publicationDate":"2014-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/2052-336X-12-63","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40300745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unmodified starch as water-soluble binding polymer for chromium ions removal via polymer enhanced ultrafiltration system.","authors":"Nurul Huda Baharuddin,&nbsp;Nik Meriam Nik Sulaiman,&nbsp;Mohamed Kheireddine Aroua","doi":"10.1186/2052-336X-12-61","DOIUrl":"https://doi.org/10.1186/2052-336X-12-61","url":null,"abstract":"<p><strong>Background: </strong>In this study the removal of Chromium (III) and Chromium (VI) ions are investigated via polymer enhanced ultrafiltration under important process parameters. This study proposes the use of unmodified starch as a novel polymer in the ultrafiltration process and its performance on the removal of chromium ions was compared with a commonly used polymer, polyethylene glycol.</p><p><strong>Methods: </strong>The experiments were carried out at 1.5 bar and different pH values by using 10 kDa hollow fiber membrane operating in a cross-flow mode.</p><p><strong>Results: </strong>The best chromium ions removal obtained approached 99% for Chromium (III) ion by unmodified starch at alkaline pH region and at pH 7 for Chromium (VI) ions retention by polyethylene glycol. Permeate flux behavior are fluctuated for both chromium ions tested at high metal ion concentrations. Low concentration of unmodified starch is applied to reduce gelatinization behavior.</p><p><strong>Conclusions: </strong>The findings suggest that binding of chromium ions by unmodified starch is related to granule structure which is probably a principal indicator of the non-ionic behavior of unmodified starch.</p>","PeriodicalId":520669,"journal":{"name":"Journal of environmental health science & engineering","volume":" ","pages":"61"},"PeriodicalIF":3.4,"publicationDate":"2014-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/2052-336X-12-61","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40301088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of forest areas on air quality; Aras Basin and its environment.","authors":"Metin Demir,&nbsp;Turgay Dindaroğlu,&nbsp;Sevgi Yılmaz","doi":"10.1186/2052-336X-12-60","DOIUrl":"https://doi.org/10.1186/2052-336X-12-60","url":null,"abstract":"<p><strong>Background: </strong>In the study, the Aras Basin and its environment, one of the most important hydrological basins of Turkey, was evaluated. In survey area, to determine the change of air quality, it was benefited from 23,770 pieces of hourly measured SO2 (Sulfur dioxide) and PM10 (particulate matter) concentration values for the December, January and February of 2009-2010 in which the pollution is at peak, by forming database in geographical information system (GIS), spatial analyze maps were attained. By comparing; maps showing attained numeral air quality and maps showing the spread of forest lands in the region, it was tried to determine the relation and interaction between air quality and forest lands.</p><p><strong>Results: </strong>The results indicated that the Air Quality Index (AQI) values were the lowest for the forest land in the months which mean that the forest land was the most convenient place for health. The increase the AQI, air pollution also increases. The results indicated that the air quality index changed from 1 to 4 within the region. In the forest areas, the AQI values for the months were the lowest. This indicated that the most suitable places for health are the places with a high forest coverage rates (76,50; 66,46 and 96,78%). There was no forest area within the region where the AQI values were the highest, so the risk was maximum, for the months.</p><p><strong>Conclusions: </strong>Authorities should create new afforestation areas and rehabilitate degraded forest lands to limit air pollution by increasing the quality of urban life.</p>","PeriodicalId":520669,"journal":{"name":"Journal of environmental health science & engineering","volume":" ","pages":"60"},"PeriodicalIF":3.4,"publicationDate":"2014-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/2052-336X-12-60","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40297443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Arsenic removal from aqueous solutions by adsorption onto iron oxide/activated carbon magnetic composite.","authors":"Shuhua Yao,&nbsp;Ziru Liu,&nbsp;Zhongliang Shi","doi":"10.1186/2052-336X-12-58","DOIUrl":"https://doi.org/10.1186/2052-336X-12-58","url":null,"abstract":"<p><p>In this work the adsorption features of activated carbon and the magnetic properties of iron oxides were combined in a composite to produce magnetic adsorbent. Batch experiments were conducted to study the adsorption behavior of arsenate onto the synthetic magnetic adsorbent. The effects of initial solution pH, contact time, adsorbent dosage and co-existing anionic component on the adsorption of arsenate were investigated. The results showed that the removal percentage of arsenate could be over 95% in the conditions of adsorbent dosage 5.0 g/L, initial solution pH 3.0-8.0, and contact time 1 h. Under the experimental conditions, phosphate and silicate caused greater decrease in arsenate removal percentage among the anions, and sulfate had almost no effect on the adsorption of arsenate. Kinetics study showed that the overall adsorption rate of arsenate was illustrated by the pseudo-second-order kinetic model. The applicability of the Langmuir and Freundlich models for the arsenate adsorption data was tested. Both the models adequately describe the experimental data. Moreover, the magnetic composite adsorbent could be easily recovered from the medium by an external magnetic field. It can therefore be potentially applied for the treatment of water contaminated by arsenate. </p>","PeriodicalId":520669,"journal":{"name":"Journal of environmental health science & engineering","volume":" ","pages":"58"},"PeriodicalIF":3.4,"publicationDate":"2014-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/2052-336X-12-58","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40289346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laboratory evaluation of a prospective remediation method for PCB-contaminated paint.","authors":"Erin K H Saitta,&nbsp;Michael J Gittings,&nbsp;Christian Clausen,&nbsp;Jacqueline Quinn,&nbsp;Cherie L Yestrebsky","doi":"10.1186/2052-336X-12-57","DOIUrl":"https://doi.org/10.1186/2052-336X-12-57","url":null,"abstract":"<p><strong>Background: </strong>Paint laden with polychlorinated biphenyls (PCBs) often acts as a point source for environmental contamination. It is advantageous to address contaminated paint before the PCBs transport to surrounding media; however, current disposal methods of painted material introduce a variety of complications. Previous work demonstrates that PCBs can be broken down at ambient temperatures and pressures through a degradation process involving magnesium metal and acidified ethanol. This report is an extension of that work by describing the development of a delivery system for said reaction in preparation for a field test. Two treatment options including the Activated Metal Treatment System (AMTS) and the Non-Metal Treatment System (NMTS) remove and degrade PCBs from painted surfaces.</p><p><strong>Findings: </strong>AMTS decreased the Aroclor® concentration of a solution by more than 97% within 120 minutes and the Aroclor® concentration of industrial paint chips by up to 98% over three weeks. After removing up to 76% of PCBs on a painted surface after seven days, NMTS also removed trace amounts of PCBs in the paint's concrete substrate. The evaporation rate of the solvent (ethanol) from the treatment system was reduced when the application area was increased. The solvent system's ability to remove more than 90% of PCBs was maintained after losing 36% of its mass to solvent evaporation.</p><p><strong>Conclusions: </strong>The delivery systems, AMTS and NMTS, are able to support the hydrodechlorination reaction necessary for PCB degradation and are therefore attractive options for further studies regarding the remediation of contaminated painted surfaces.</p>","PeriodicalId":520669,"journal":{"name":"Journal of environmental health science & engineering","volume":" ","pages":"57"},"PeriodicalIF":3.4,"publicationDate":"2014-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/2052-336X-12-57","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40288859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Removal of penicillin G from aqueous phase by Fe+3-TiO2/UV-A process.","authors":"Mansooreh Dehghani,&nbsp;Simin Nasseri,&nbsp;Mohammad Ahmadi,&nbsp;Mohammad Reza Samaei,&nbsp;Amir Anushiravani","doi":"10.1186/2052-336X-12-56","DOIUrl":"https://doi.org/10.1186/2052-336X-12-56","url":null,"abstract":"<p><strong>Background: </strong>Anomalous use of antibiotics and their entrance into the environment have increased concerns around the world. These compounds enter the environment through an incomplete metabolism and a considerable amount of them cannot be removed using conventional wastewater treatment. Therefore, the main objectives of this research are evaluation of the feasibility of using ultraviolet radiation (UV-A) and fortified nanoparticles of titanium dioxide (TiO2) doped with Fe+3 to remove penicillin G (PENG) from aqueous phase and determining the optimum conditions for maximum removal efficiency.</p><p><strong>Results: </strong>The results showed that the maximum removal rate of penicillin G occurred in acidic pH (pH = 3) in the presence of 90 mg/L Fe+3-TiO2 catalyst. In addition, an increase in pH caused a decrease in penicillin G removal rate. As the initial concentration of penicillin G increased, the removal rate of antibiotic decreased. Moreover, due to the effect of UV on catalyst activation in Fe+3-TiO2/UV-A process, a significant increase was observed in the rate of antibiotic removal. All of the variables in the process had a statistically significant effect (p < 0.001).</p><p><strong>Conclusion: </strong>The findings demonstrated that the antibiotic removal rate increased by decreasing pH and increasing the amount of catalyst and contact time. In conclusion, Fe+3-TiO2/UV-A process is an appropriate method for reducing penicillin G in polluted water resources.</p>","PeriodicalId":520669,"journal":{"name":"Journal of environmental health science & engineering","volume":" ","pages":"56"},"PeriodicalIF":3.4,"publicationDate":"2014-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/2052-336X-12-56","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40286144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of pilot scale nanofiltration system for yeast industry wastewater treatment.","authors":"Ahmad Rahimpour,&nbsp;Mohsen Jahanshahi,&nbsp;Majid Peyravi","doi":"10.1186/2052-336X-12-55","DOIUrl":"https://doi.org/10.1186/2052-336X-12-55","url":null,"abstract":"<p><p>The treatment of the yeast industry wastewater was investigated by nanofiltration (NF) membrane process on a pilot scale. Two wastewaters were used as feed: (i) dilute wastewater with COD 2000 mg/L and (ii) concentrate wastewater with COD 8000 mg/L. The permeate flux, COD retention, color and electrical conductivity (EC) removal were evaluated in relation to trans-membrane pressure and long-term filtration. A linear growth in permeate flux was found with increasing in trans-membrane pressure for wastewaters. In addition, the COD retention, color and EC removal increased with trans-membrane pressure enhancement. The results obtained from the long-term nanofiltration of dilute wastewater indicated that the permeate flux decreased from 2300 L/day to 1250 L/day and COD retention increased from 86% to 92%. The quality of the permeate in term of COD is lower than the discharge standard in river (200 mg/L). Thus, this process is useful for treatment of wastewaters produced by yeast industry. </p>","PeriodicalId":520669,"journal":{"name":"Journal of environmental health science & engineering","volume":" ","pages":"55"},"PeriodicalIF":3.4,"publicationDate":"2014-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/2052-336X-12-55","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40281066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}