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Open Access Article
1 - Determining the Optimum Coagulant for Chemical Treatment of Fiber Wastewater from Pulp and Paper Mills
هانیه میربلوکی shamim moghadami Fariba OstovarPulp and paper mills consider as a major wastewater producer industries in order to cellulosic pollution and also consuming high amount of water during the process.The wastewater treatment process is complicated because these kinds of effluents contain suspended & coll MorePulp and paper mills consider as a major wastewater producer industries in order to cellulosic pollution and also consuming high amount of water during the process.The wastewater treatment process is complicated because these kinds of effluents contain suspended & colloidal impurities and color & odor; so using chemical coagulants via the Jar test can be an appropriate alternative to remove the contaminants. In this research, different concentrations of Alum, PAC and FeCl3 coagulants were tested to reduce the contamination load of the effluent from three important major parts of fiber wastewater producers; that, according to the results FeCl3 was reported as the best chemical coagulants which removed 61%, 74/05 % and 58% of the COD from the three mentioned parts effluent. Therefore, chemical treatment by using of an appropriate coagulant with the optimum concentration can perform an important role in reducing the effluent contamination load. Manuscript profile -
Open Access Article
2 - Coagulant recovery from waterworks sludge by acid digestion method
S Elaheh Mahdavian Ahagh Fariba OstovarCoagulation is a process that increases the tendency of small particles in an aqueous suspension to attach to one another and to surfaces such as the media in a filter bed and is applied through mixing coagulants such as aluminum sulfate (alum), ferric chloride and poly MoreCoagulation is a process that increases the tendency of small particles in an aqueous suspension to attach to one another and to surfaces such as the media in a filter bed and is applied through mixing coagulants such as aluminum sulfate (alum), ferric chloride and polyaluminum chloride with raw water. Sludge containing coagulant is formed after coagulation and through sedimentation of natural turbidity. Presence of high amounts of coagulant in waterworks sludge, increases environmental risks and disposal costs. Coagulants in sludge have high economic value. Therefore, if these coagulants recover, not only sludge disposal risks but also expenses related to supply of fresh coagulant in water or wastewater treatment plant may decrease. In this paper, researches conducted by acid digestion method for coagulant recovery from waterworks sludge are investigated. Amounts of coagulant recovery, advantages and disadvantages and economic aspects of this method are studied. Results of the investigation showed that using sulfuric acid is the best option for conducting acid digestion process because it is cheap and available. Moreover, if the purpose of recovering process is to achieve a recovered coagulant with a similar quality to the commercial ones, acid digestion method will not satisfy related standards. Manuscript profile -
Open Access Article
3 - A review of widely used industrial dyes and their removal methods from water and wastewater
Fariba Ostovar Marzieh HasanzadehIn 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 MoreIn 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
4 - Evaluation of natural adsorbents in water and wastewater treatment
Mohadeseh TavakoliWith increasing industrial activities and discharging untreated wastewater which contains various environmental pollutants to aquatic environments, problems such as reducing the penetration of light, anaerobic conditions and complications such as allergies and cancer fo MoreWith increasing industrial activities and discharging untreated wastewater which contains various environmental pollutants to aquatic environments, problems such as reducing the penetration of light, anaerobic conditions and complications such as allergies and cancer for humans and other living organisms will occur. Surface absorption is one of the most effective and efficient methods for the removal of environmental pollutants and among the common methods for treatment of wastewater, applying natural adsorbents are more efficient than the other methods and is more economic. Since there are many natural adsorbents in nature, they are very inexpensive, they are even free in some cases; adsorption of contaminants by these materials can be a suitable way to remove the toxic substances of contaminated water and industrial wastewater. In this paper, we study some of bioactive adsorbents in order to remove contamination from industrial wastewater. Manuscript profile -
Open Access Article
5 - Recent advance in MXenes: antibacterial Activity and waste treatment
nasibeh hajilaryRecently, two-dimensional (2D) lamellar membranes have attracted worldwide attention of researchers because of mechanical robustness, tunable pore size, high performance, and their easy processing. MXenes 2D materials, also known as carbide/nitride functionalized metal MoreRecently, two-dimensional (2D) lamellar membranes have attracted worldwide attention of researchers because of mechanical robustness, tunable pore size, high performance, and their easy processing. MXenes 2D materials, also known as carbide/nitride functionalized metal nanoparticles, have applications in a variety of applications such as capacitors and ion batteries for energy storage, catalysts, wastewater treatment membranes and heavy metal ions separation. In the last decade, extensive studies have been conducted to improve the applicability of heavy metal adsorbent membranes with the aid of MXenes and its complexes. Given the challenges that environmental pollutants pose to nature and organisms, it is important to find ways of absorbing and removing pollutants. In this article, after introducing MXenes and its various structures, recent studies on wastewater treatment and nuclear waste treatment with MXenes and its compounds are summarized along with its antibacterial properties Manuscript profile -
Open Access Article
6 - Feasibility Study of Denitrification of Drinking Water Using Photocatalytic Substrate over Ultra-High Performance Concrete
Sama Tajasosi Jalil Barandoust Ramazan Vagheei Fariba Ostovar saeed poorkareemDenitrification of drinking water has a research history of more than three decades in the field of water treatment and is still the subject of many research projects. The main purpose of this study is to obtain or modify methods for removing nitrate from drinking water MoreDenitrification of drinking water has a research history of more than three decades in the field of water treatment and is still the subject of many research projects. The main purpose of this study is to obtain or modify methods for removing nitrate from drinking water in an economic way and force minimal adverse effects on the environment. The use of photocatalytic process for denitrification is not new, but there are still many ambiguities. In this study, the feasibility of using two different photocatalysts over the ultra-high performance concrete (UHPC) substrate was discussed. This new substrate is fabricated by immobilizing the photocatalyst inside a cement matrix which acts as an active layer over the UHPC surface. Optimum long-term lifecycle and higher efficiency of this active surface is achieved without a significant drop of the photocatalyst activity near the surface. In this study, the possibility of using photocatalytic composite layers over the elements made of UHPC for applications such as water supply channels was evaluated and the challenges of using such layers on UHPC surfaces were described. According to the studies, it was found that the use of fixed cement composite bed for photocatalytic treatment has advantages over other methods of photocatalytic water treatment. Manuscript profile -
Open Access Article
7 - Use of Plasma Cavitation Reactor in condensation of sanitary sewage treatment Plant at IKCO Company
Leili Masoumi ghaleh Ali Sayadi malakami Amir Emami Naeemeh Shirakbari Javad Modabber Majid Javadyan sarcheshmeIn order to condensing the sanitary sludge, two types of complementary centrifugal and screw press devices are usually used. In this paper, in order to increase the efficiency and maximum dewatering in the final stage of the treatment plant, plasma cavitation reactor wa MoreIn order to condensing the sanitary sludge, two types of complementary centrifugal and screw press devices are usually used. In this paper, in order to increase the efficiency and maximum dewatering in the final stage of the treatment plant, plasma cavitation reactor was used. The input sample of the studied system is the output sludge of the sanitary wastewater treatment plant process of IKCO after entering the digestion tank and staying for one hour. Using a plasma cavitation reactor by rectifier, a voltage of 50 volts and a current of 110 amps was applied to 5 iron electrodes in the cavitation reactor tank with a volume of 1 m3 and the sample was tested for 8 days and every day for 8 hours. Then, the effect of the presence of cavitation reactor on the percentage of dry matter is compared with the centrifuge and multi-disc screw press system when they used alone. Based on industrial and laboratory results, a decrease of more than 80% of wet sludge (conversion of 100 m3 of sludge to about 20 m3 daily) was observed daily. Also, the COD of the outlet water from the final cavitation tank was less than 200 mg/L, also, the amount of its turbidity reached below 50 NTU after passing through sand filters in the final stages which can be used for irrigation and agriculture. Using plasma cavitation reactor was effective in reducing settling time and the final volume of wet sludge. Manuscript profile -
Open Access Article
8 - Investigation of pollution index parameters in the effluent of wastewater treatment plants in industrial towns of Guilan province
Mohammad Yazdi Hanieh MirbolookiNowadays, the importance of water is known more than before as a life factor and the axis of sustainable development that to protect and manage it, it needs to be controlled using laboratory tests and regular monitoring program. The purpose of this study was to investig MoreNowadays, the importance of water is known more than before as a life factor and the axis of sustainable development that to protect and manage it, it needs to be controlled using laboratory tests and regular monitoring program. The purpose of this study was to investigate the treatment plant effluent of three large industrial towns in Gilan province and comparing the index parameters with Environmental Protection Organization standards; the measured parameter included pH, TDS, DO, COD and BOD5. The results showed that, some index parameters in the treatment plant effluent in some industrial towns were more than the approved discharge standards to the receiving environments which indicates the necessity of paying attention to regular monitoring and investigation of wastewater treatment systems in industrial towns more than before. Manuscript profile -
Open Access Article
9 - Removal of lead with metallic organic nanostructures of iron and benzene tricarboxylate from aqueous solution
reza alizadehHeavy metals are not chemically degraded, in order to prevent the entry and accumulation of this toxic pollutant along with factory effluents into the environment, so far, different methods have been used, but finding new methods with more efficiency in this area is nec MoreHeavy metals are not chemically degraded, in order to prevent the entry and accumulation of this toxic pollutant along with factory effluents into the environment, so far, different methods have been used, but finding new methods with more efficiency in this area is necessary. In this research, a new class of compounds called organic metallic materials has been used to remove industrial effluent lead. These organic metallic materials contain iron and benzene tricarboxylate. To identify the characteristics of these materials, electron microscope images and Nitrogen adsorption and desorption isotherms has been used. To determine the optimal conditions for using these materials for lead removal from the effluent, the effect of parameters: time (10-120 min), the amount of adsorbent (0.2-0.5 mg/L), pH (3.5 -12.5) and temperature (10-75 ° C) were evaluated. The results show that the composition of MIL-100 (Fe) has a better performance than the other materials in this study and complete removal of lead was achieved with an initial concentration of 10 mg/l and an adsorbent dose of 0.25 mg / l, at a temperature of 50 ° C, pH =4.3 and contact time of 120 min. Other properties of this material in removal of industrial effluent lead such as magnetic properties, reusability in five consecutive periods, large surface area, low cost, high efficiency and easy to use, make it an ideal option for large-scale use. Manuscript profile
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