• List of Articles  

      • Open Access Article

        1 - Determining the Optimum Coagulant for Chemical Treatment of Fiber Wastewater from Pulp and Paper Mills
        هانیه میربلوکی shamim moghadami Fariba Ostovar
        Pulp 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 Full Text
        Pulp 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 Document
      • Open Access Article

        2 - Environmental Impact Assessment of Steel Plant Construction
        هانیه میربلوکی niloofar Abedinzade fatemeh ghanbari
        Today, steel production and consumption is applied as an important criterion for measuring the degree of countries industrial development. Needing to investment in construction and economic infrastructure in developing countries, their steel production policy is in the Full Text
        Today, steel production and consumption is applied as an important criterion for measuring the degree of countries industrial development. Needing to investment in construction and economic infrastructure in developing countries, their steel production policy is in the direction of producing the various types of structural steel. In this regard, the main object of the studied steel plant construction is creating jobs in the region, reducing imports and contributing to the country's economic development through carbon ingot production with electric arc furnace technology. After assigning the direct study area of the project, the major contaminants arising from the project implementation were investigated in construction and implementation phases and the corrective actions considered to reduce the contaminants effects. In this research, Rapid Assessment method was used for environmental impact assesment that according to the results, among 96 detected impacts, 55.1 percent of the impacts are negative and 44.9 percent are positive that in case of observing the corrective actions before and after the project implementation, its negative impacts will be minimized. Also, it is recommended that after the plant costruction, apply a periodic monitoring of the outlet contaminants every three months. Manuscript Document
      • Open Access Article

        3 - Investigation of Gilan index dams' water quality using multivariate methods
        Hanieh Mirbolooki Babak Razdar Matin Mohafezatkar
        Nowadays, 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 various water quality indexes. The purpose of this study was to inves Full Text
        Nowadays, 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 various water quality indexes. The purpose of this study was to investigate water quality in diversion dams in Guilan province in which the dams have been ranked using Shannon and TOPSIS entropy methods. The dams included Pasikhan, Shakhzar, Polrud and Tarik and the measured indicators included Ec, pH, TDS, Temperature, SO4, HCO3, Cl, Ca, Mg, Na, TSS, DO, BOD5 and COD. Shannon entropy results showed that among the indicators, the highest index weight is related to TSS with the amount of 0.1973 and the lowest one is related to pH with the amount of zero. Topsis tests results showed that based on the weights derived from entropy and water quality indicators, Pasikhan dam is in the first rank, Polrud dam is in the second rank, Shakhzar dam is in the third rank and Tarik dam is in the last rank. So, according to multivariate selection methods, water quality in different dams with similar conditions can be investigated. Manuscript Document