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Background: Phenol is a prevalent pollutant found in many industrial wastewaters, and it is paid singular attention because of its special features like high toxicity, carcinogenic properties, and vital gathering ability that affects the health of humans and the environment. One of the most important technologies for the removal of phenol is the use of adsorbents. The current study investigated the removal of phenol from synthetic aqueous solutions using Citrullus colocynthis seed ash. Methods: This study is experimental and was conducted on a pilot scale. The efficiency of phenol removal by C. colocynthis seed ash was evaluated in a batch system, and different parameters such as initial concentration of phenol (10, 20, 50, and 80 mg/L), contact time (2, 5, 10, and 30 minutes), pH (2-12), adsorbent dose (0.5, 1, 3, 5, and 10 g/L), and temperature were studied. Excel software was used for data analysis. The adsorption process was modeled with Freundlich and Langmuir isotherms at controlled temperatures. Results:The results showed that the highest removal rate of phenol was obtained at a pH of 2 (83.4%), initial phenol concentration of 20 ppm (66.4%), adsorbent dose of 5 g/L (86.8%), and contact time of 10 minutes. The evaluation of correlation coefficients showed that the phenol adsorbed by C. colocynthis seed ash was in greater accordance with the Freundlich model than the Langmuir model. Conclusion:In general, the results of this study revealed that C. colocynthis seed ash has suitable potential for use in removing phenol from aqueous solutions on operation and practical scales due to its low cost and easy access. Keywords: Phenol, Adsorption, Citrullus colocynthis Citation: Salari S, Afsharnia M, Moteallemi A, Ghasemi M. Evaluation of removal efficiency of phenol from synthetic aqueous solutions by Citrullus colocynthis seed ash.

Background: Noise pollution is one of the most important environmental pollutions that affects human health in different dimensions. The current study aimed to survey the effects of noise pollution on residents of the Samen district in Mashhad. Methods: To understand the psychological effects that noise pollution caused by vehicles has on people, 400 questionnaires designed to gather demographic data and information on attitudes about noise pollution, its effects on people's activities, and noise source annoyance were randomly distributed among the people living in the Samen district of Mashhad city. SPSS software was used for statistical analysis. Results: According to the results of this study, the most important effects noise pollution had on the studied society were nervousness (29.1%), conversation problems (19.8%), amnesia (18.3%), and loss of concentration (12.8%). Furthermore, 54.8% of the respondents considered the environmental noises annoying, and 32.5% reported it very annoying. In this study, traffic noise was reported as the most important source of noise pollution. Conclusion: Generally, the results showed that noise pollution is a serious issue in the Samen district, and the necessary actions should be taken to control noise and prevent the effects of noise pollution.

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Background and Aim: landfill leachate is a type of wastewater that contains significant amounts of soluble organic compounds. The aim of this study is determining the efficiency of the column of nanoparticles in removing heavy metals from leachate. In this study; the required leachate was Original Research Article