128 research outputs found
Development of a liquid-phase microextraction based on the freezing of a deep eutectic solvent followed by HPLC-UV for sensitive determination of common pesticides in environmental water samples
No full textIn this research, a new extraction method based on liquid-phase microextraction and the freezing of deep eutectic solvent has been developed for the determination of pesticides in water prior to their analysis by HPLC-UV.</p
The Effect of Different Concentrations of Phenol on Anaerobic Stabilization Pond Performance in Treating Petroleum Refinery Wastewater
No full textIn this study the efficiency of anaerobic stabilization pond for treating oil refinery wastewater at different concentrations of phenol is investigated. The anaerobic stabilization pond (ASP) was built from fiberglass plats (0.2m×1m×1m and 6mm thickness). The experimental apparatus was performed at HRT (2d) with hydraulic loading rate 95L/day. After inoculation of the biomass, reactor was run at different concentrations of phenol (100, 200, 300, and 400 mg/L). Sampling is carried out from effluent after achievement of steady state condition at all experimental tests. The samples for the determination of NH3, PO4 and Phenol, were analyzed using a spectrophotometer (Varian, UV-120-02). In addition, other parameters such as TCOD, SCOD, TBOD, SBOD, and pH were determined using standard methods. The results showed that the efficiency of system reduced at phenol concentrations of 100, 200, 300, 400 mg/L. The maximum and minimum removal rates of BOD and COD were 71.75±8.14; 76.07± 10.94 and 53.5±6.03, 55.63±3.47 by the system respectively at phenol concentrations of 100 and 400 mg/l. The optimum condition for phenol removal (89.82% and 55.86%) was determined with phenol concentrations of 100 mg/L and 400 mg/L, respectively. This study showed a comprehensive efficiency of anaerobic stabilization pond as a promising system to eliminate different concentrations of Phenol, COD and BOD, however increase of Phenol concentration to 400 mg/L was decreasing of system efficiency due to phenol toxicity for biomass
Comparison of Mashhad Aolang Wastewater Treatment Plant Effluent with Wells Water Quality for Irrigation
No full textNowadays treated effluent reuse is very important due to the water shortage problem. The aim of this study was comparison the quality of Mashhad Aolang treatment effluent plant with wells water on that area for irrigation purpose and their effects on wheat production. In this study a total number of 24 well water and 24 treated Wastewater samples were taken, weekly within the period of six months. Totally eight wheat farms were selected at the end of wheat growing season which four wheat farms among them were irrigated with treated wastewater and the other four farms were irrigated with wells water. Heavy metals (Cd, Ni, Fe, Mn, Pb, Zn and Co) and pH, EC, BOD5, COD, TSS, nitrate, nitrite, PO42-, alkalinity, Na%, RSC, ESP, SAR in all samples were measured according to standard methods. Results indicated that the quality of all measured parameters in treated effluent were consistent with the agricultural irrigation standard. In comparison, irrigated with treated wastewater was more productive than well water on wheat production. In conclusion, replacing treated wastewater with continuous monitoring with well water for irrigation purposes is recommended
Studying the Frequency of Needle Stick Injuries Suffered While Providing Medical Services in a Hospital in Kermanshah, Iran
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Human health risk assessment by Monte Carlo simulation method for heavy metals of commonly consumed cereals in Iran- Uncertainty and sensitivity analysis
No full textPerformance Evaluation of Coagulation Process in Removal of Low Turbidity and Color from Water Using Different Inorganic Coagulants
No full textThis research work was carried out in lab scale using a Jar-test set up. In order to compare the performance of four inorganic coagulants (poly aluminum chloride, ferro sulfate, ferric chloride, aluminum sulfate) in removal of turbidity and color from water, three independent variables (turbidity, color and coagulants dosage) were investigated. The region of exploration for the process was taken as the area enclosed by turbidity (10, 20, 50 NTU), color (5, 10 TCU) and concentration of coagulants (5, 10, 15, 120, 25, 30 mg/l) boundaries. The rapid and slow mixing steps were provided by the rate of 80 rpm for 1 min and 30 rpm for 20 min, respectively. The samples were then remained for 30 min as settling stage. Four parameters including turbidity, electrical conductivity (EC), pH and color were measured from the samples supernatant. Settling characteristics of the flocs formed were descriptively reported as poor, fair, good and excellent. From the results, poly aluminum chloride with concentration of 5 mg/l was found to be the best for the removal of turbidity (99-99.8 %) and color (100 %). However, fine flocs with very good settling velocity was observed at the condition with initial turbidity of 10, 20, 50 NTU. Increase in EC along with decrease in alkalinity was obtained as the coagulants concentrations were increased. The maximum and minimum amount of increase in EC and TDS were resulted from ferric chloride and poly aluminum chloride, respectively
Bio-based hydrophobic fiberglass filters functionalized with RPTES for efficient oil-water separation
No full textThis study introduces a sustainable and highly efficient method for oil-water separation using fiberglass fabric (FG-Castor) functionalized with ricinoleamidopropyl-triethoxysilane (RPTES), a novel hydrophobic compound synthesized from castor oil via a solvent-free aminolysis reaction. The resulting superhydrophobic filter exhibits a high water contact angle of 146.31° and effectively separates petroleum-based solvents—including gasoline, kerosene, and n-hexane—from water under gravity-driven conditions. Characterization by SEM-EDX, X-ray mapping, and ¹³C NMR confirmed successful surface modification and amide bond formation. The FG-Castor filters demonstrated exceptional separation efficiency (up to 98.71 %) and high permeated flux (up to 5760 L/m²·h), while maintaining stable performance over 20 reuse cycles. The filters also retained high efficiency under varying pH and temperature conditions, highlighting their robustness and versatility. These findings demonstrate the potential of bio-derived, solvent-free surface treatments in advancing green, cost-effective technologies for industrial wastewater management and oil spill remediation
Performance of Granular Activated Carbon to 2,4-Dichlorophenoxy Acetic Acid Aemoval from Aqueous Environments
No full textNormal 0 false false false EN-US X-NONE AR-SA MicrosoftInternetExplorer4 Background and Objectives: 2, 4-dichlorophenoxy acetic acid is a well-known herbicide which can be dangerous for&nbsp; both human and animal health in different ways such as its presence in drinking water. This study aimed at Performance of granular activated carbon to 2-4-D removal from aqueous solution and assessing the relationship between COD and 2-4-D concentration Materials and Methods: This study is a lab-scale study. Firstly, different 2-4-D concentrations were prepared from Stock solution (1000 mg/L), and then their CODs were measured. Optimum pH for 2-4-D removal was determined and its absorption rate at different concentrations was measured. Results: Results showed a clear relationship between COD and 2-4-D concentration. On the other hand, COD removal increased as time elapsed, so that maximum removal 90% and 84% at initial 2-4-D concentrations of 50 and 100 mg/L were observed at contact time of 50 min respectively. Optimum pH for all concentrations was determined as 6. Conclusion: According to present study it can be concluded that activated carbon have be up to 90% of 2-4-D removal from water environment. In addition, a significant relationship was observed between COD and 2-4-D concentration, so that direct measurement of COD can be used instead of 2-4-D measurement. /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:Arial; mso-bidi-theme-font:minor-bidi;
An experimental study on the influence of zeolite on changes of pH and alkalinity in anaerobic treatment of compost leachate
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