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        1 - A review of widely used industrial dyes and their removal methods from water and wastewater
        Fariba Ostovar Marzieh Hasanzadeh
        In recent years, the expansion of industries has led to increase industrial wastewater production and environmental pollution. Dyes materials are one of the most important pollutants in industrial wastewater. Today, dyes are widely used in various industries such as tex More
        In recent years, the expansion of industries has led to increase industrial wastewater production and environmental pollution. Dyes materials are one of the most important pollutants in industrial wastewater. Today, dyes are widely used in various industries such as textile, paper, leather, printing, and cosmetics. Drainage of colored wastewater does not only affect the aesthetic aspect of the receiving water but also reduces the process of photosynthesis. Also, the colors and their intermediate products are toxic, carcinogenic and mutagenic for aquatic life. Most of these dyes cause skin allergies, dermatitis, and itching, and accelerate the incidence of cancer and mutation in humans. Therefore, industrial wastewaters containing dye need to be treated prior to discharge into the receiving environment. The purpose of this study was to provide a summary of the most important industrial dyes, the health and environmental effects of dyes as pollutants, and to describe the methods for their removal from water and wastewater. In this study, different dye removal methods such as biological, physical and surface adsorption methods were described and the best process for treatment of colored wastewater was introduced considering the economical cost. Manuscript profile
      • Open Access Article

        2 - Investigation of microplastics as emerging contaminants in sources and health effects on humans, review study
        Marjan Salari Mohammadbagher Khorasani
        In recent years, environmental contamination with plastics has become one of the biggest concerns of various communities. Microplastics (MPs) are plastics less than 5 mm in size. MPs remain in the environment for thousands of years without decomposing. However, accurate More
        In recent years, environmental contamination with plastics has become one of the biggest concerns of various communities. Microplastics (MPs) are plastics less than 5 mm in size. MPs remain in the environment for thousands of years without decomposing. However, accurate analytical methods for the detection and characterization of MPs are scarce. In this descriptive-review study, based on the studies of various researchers and the papers of recent years, this contamination has been introduced and its adverse effects on human health and different environments have been discussed. The results of the studies have shown that microplastic contamination of salt has been reported significantly between four different sources: sea salt 0-1674, lake salt 8-468 and well rock salt 0-204 microplastic per kg (MPs/kg). The number of MPs in untreated water is 1437±34 to 3605±497 particles per liter and in general, the amount of microplastics in treated water is about 83% less than untreated water generally. The length and diameter should be considered when reporting the presence of MPs because the diameter is significant for respiration, while length plays a vital in durability and toxicity. Although the adverse health effects of microplastics have not been fully revealed, but the transfer of chemicals from microplastics to living organisms is a significant concern, and a better understanding of the potential dangers of microplastics is essential to human health. Manuscript profile