List of articles (by subject) Pollution of water resources
-
Open Access Article
1 - Comparison the changes of two Hinosan and Butachlor toxins in Groundwater resources from Guilan province
maryam panahandeh mehdi ashournia Mirmoslem Rahbar hashemi hadi ModabberiThe aim of this study was to compare the content of two commonly used poisons in Guilan province in order to increase the crops, especially rice, in water used by residents of Gilan in spring. For this purpose, 20 wells were selected in the villages of Guilan. The extra MoreThe aim of this study was to compare the content of two commonly used poisons in Guilan province in order to increase the crops, especially rice, in water used by residents of Gilan in spring. For this purpose, 20 wells were selected in the villages of Guilan. The extraction process was carried out using liquid and N-hexane-dichloromethane (1: 1) phases for analysis. The extraction product was injected into a gas chromatograph with an electron capture detector (GC-ECD) for measurement. The sampling and measurement process was carried out. Quantitative measurements were carried out using external standard methods. The studies carried out confirmed that in the study chapter, the study of the content of Hinosan and Butachlor pesticides is not more than standard and more acceptable, but due to their toxicity and their long-term effects on creatures Consumers, especially humans, it be used continuous monitoring of their amount in water by residents. Manuscript profile -
Open Access Article
2 - Groundwater vulnerability assessment using drastic method based on GIS in central plain of Guilan
Industrial and agricultural developments and the population of rural and communities led to excessive consumption of chemical detergents and fertilizers and increasing industrial wastwater which threaten water resources in last decades. Vulnerability of the water resour MoreIndustrial and agricultural developments and the population of rural and communities led to excessive consumption of chemical detergents and fertilizers and increasing industrial wastwater which threaten water resources in last decades. Vulnerability of the water resources is a continuation of such trends. The first step in management of the groundwater resources is a determination of the vulnerable areas. The objective of this research was determin the vulnerability assessment of the central plain of Guilan using DRASTIC model. Principles of the model are based on overlaying of seven thematic maps of depth to water table, net recharges, aquifer media, soil media, topography, vados zone and hydraulic conductivity by considering appropriate weights and rates. The database was constructed by introducing the mentionec maps. Index of DRASTIC model for aquifer vulnerability of the central plain Guilan was ranged in 82-182. In this plain, there was not very much and very low vulnerability classes. The final map of DRASTIC model showed that % 48.64 of the area has high vulnerability and % 50.55 has medium vulnerability and only a small area of plain (% 0.81) has low vulnerability. Th estatistical summary of the DRASTIC model elements shows that the element of depth to groundwater table has the greatest impact on DRASTIC model. Also based on the map remove and single element sensitivity, depth to groundwater table is identified as the effective element in the central plain of Guilan. The results of the correlation between the elements of DRASTIC model and nitrate concenteration showed that there is the highest correlation between nitrate and depth to groundwater table. The average concentration of nitrates is 8.92 mg/lit in the wells studied at the Central Plains Guilan. In all wells studied, nitrate concentration was lower than the recommended level by US Environmental Protection Agency (45 mg/lit). Manuscript profile -
Open Access Article
3 - An Overview of Oil Pollution in the Caspian Sea
Hamoun Jalilzadeh mehran parsa mohammad reza golriz eram sadatiCrude oil is a mixture of pure compounds, from the chemical point of view, oil is a mixture of hundreds of molecular compounds called hydrocarbons. Therefore, in this article, various families of hydrocarbons are studied without going into organic chemistry. Then, oil h MoreCrude oil is a mixture of pure compounds, from the chemical point of view, oil is a mixture of hundreds of molecular compounds called hydrocarbons. Therefore, in this article, various families of hydrocarbons are studied without going into organic chemistry. Then, oil hydrocarbons and in particular PAHs, which are the main subject of this research, are being examined. Moreover, an overview of the information gathered about the effects and toxicity of these compounds. The presence of oil pollution in many years in the seas and coastlines of the world has made this topic very much to be considered. Many studies have been conducted to investigate these contaminations, some of which are mentioned in this article. Oil pollution studies related to the Caspian Sea are widely discussed in this paper. Manuscript profile -
Open Access Article
4 - The Investigation of Ability to Degradation and Removal of Various Dyes Using Silver Colloidal Nanoparticles
Mohadeseh Tavakoli Fariba OstovarColors are one of the most important pollutants of water, and only one entry into the water can significantly reduce the quality of water. In addition, due to the synthetic origin and the presence of complex molecules in the structure of colors, the purification process MoreColors are one of the most important pollutants of water, and only one entry into the water can significantly reduce the quality of water. In addition, due to the synthetic origin and the presence of complex molecules in the structure of colors, the purification process is sometimes accompanied by some problems. Colloidal nanoparticles play an important role in technology, especially in the manufacture of glass and ceramics, and are used as a suitable method for cleaning pollutants in water and wastewater. In this study, a chemical regeneration method was used to synthesize colloidal silver nanoparticles. Then, to evaluate the efficiency of synthetic silver nanoparticles, several solutions of dye and pigments such as sulfur, azo, reactive, cationic and anionic dyes were prepared and synthetic material was used for degradation of different colors. Finally, the effect of this colloidal nanoparticle on each of them was studied and compared. The results showed that silver colloidal nanoparticles have the ability to degradation and removal of methyl orange and methyl red dyes from aqueous samples, and these nanoparticles can be used for treatment the water and wastewater containing these dyes. Manuscript profile -
Open Access Article
5 - Analysis of vulnerability of groundwater resources and analysis of the sensitivity of drastic model using map removal and single-element mapping methods using Monte Carlo technique
hadi Modabberi Mirmoslem Rahbar hashemi mehdi ashourniaApplying a proper management on water resources by identifying vulnerable areas as the first solution can be useful. The purpose of this study was to assess the vulnerability in the central plain of Guilan with drastic model. To identify the vulnerable areas of the cent MoreApplying a proper management on water resources by identifying vulnerable areas as the first solution can be useful. The purpose of this study was to assess the vulnerability in the central plain of Guilan with drastic model. To identify the vulnerable areas of the central plain of the Guilan plain to pollution, drastic model was used and an aquifer vulnerability map was developed. The principles of the drastic model are based on the combination of seven components, depth to static level, net nutrition, aquifer environment, soil environment, topography, unsaturated environment, and hydraulic conductivity, which after ranking and applying weight impact on each component and algebraic composition of seven components, the final result will indicate the aquifer vulnerability. For this purpose, first, the information of the seven components in the central aquifer of Guilan was collected, and after entering in the GIS software, the layers needed for the model were finally prepared. Then, by using overlapping techniques after applying the required weight coefficients for each layer, a final vulnerability map was prepared. The profile of the drastic model varied from 82 to 182 for the vulnerability of the central aquifer of Guilan. The final drastic model map showed that 48.64% of the area had a high vulnerability and 50.55% had moderate vulnerability and only a small area of the plain (0.81%) had a low vulnerability. Based on the sensitivity method of map removal and single component and using the Monte Carlo technique, the depth distance to the station level was identified as the most effective component and saturation zone as the second most effective component in the central plain of Guilan. Manuscript profile -
Open Access Article
6 - Numerical Simulation of the effect of wall divergence and reverse slope on the charcterestics of hydraulic jump using Flow3D sofware
Amir kasi Kovzani Mohammad hosein karimi PashakiStilling basins are one of the most common structures for energy depreciation of flow with high velocity that among different sections and types of these basins, diverging stilling basins have better hydraulic performance and lower constructional costs. In this research MoreStilling basins are one of the most common structures for energy depreciation of flow with high velocity that among different sections and types of these basins, diverging stilling basins have better hydraulic performance and lower constructional costs. In this research, numerical modeling capability of diverging hydraulic jump on the reverse slope was investigated using Flow3D software. Experimental model data was used at divergence angles of 5 and 10 degrees in diverging angels of 1.3, 2.35, 3.2, 4.57 degrees in addition to classic hydraulic jump. The outputs of simulation model in comparison with the results of experimental data indicated that the model shows the amount of water surface profiles, jump length and maximum velocity in depth with good accuracy. The results showed that the mean relative error of water depth obtained from numerical model and measured values is about 15 percent. The velocity profiles were also in good agreement with the measured data. Manuscript profile -
Open Access Article
7 - Evaluation the hydrodynamic and morphology changes in Sefidrood river estuary
مرتضی کریمی Jamal Mohammad Vali SamaniGeomorphic changes of low-coastal areas, such as wetlands, estuaries and beaches depend heavily on the balance between input sediment from the basin or the sea and the outflow sediment with erosion source arising from wind waves and tidal flows. In this research, the fl MoreGeomorphic changes of low-coastal areas, such as wetlands, estuaries and beaches depend heavily on the balance between input sediment from the basin or the sea and the outflow sediment with erosion source arising from wind waves and tidal flows. In this research, the flow and sediment pattern were investigated using MIKE21 model in the Sefidrud River and how the influence of flow pattern, sediment transport and sea water level changes on evolution of the delta and coastline were studied by landsat. The factors such as flow and sediment load of the river, sea level, wind and wave pattern are the most important factors which affect these changes. This study can provide a properly field for a right management in order to the region’s sustainable development, adequate knowledge of the Sefid-Roud hydrodynamic and sediment situation in estuary area, as well as taking the necessary measures to prevent damages caused by the Caspian Sea’s long-term fluctuations in the Sefid-Roud’s deltaic region. Manuscript profile -
Open Access Article
8 - Determination of the Relationship between Water Turbidity (NTU) and Total Suspended solids (TSS) in drip irrigation
farhad mirzaei zeynab sojoodiSand filters are composed of sand-filled containers with determined granulation and specified thicknesses of pressurized sand layers that work under pressure and they are placed in the center control system after the cyclone and before the grid or disk filter. The aim o MoreSand filters are composed of sand-filled containers with determined granulation and specified thicknesses of pressurized sand layers that work under pressure and they are placed in the center control system after the cyclone and before the grid or disk filter. The aim of this study was to determine the relationship between water turbidity and Total suspended solids (TSS). To determine the samples turbidity, they were tested using a spectrophotometer and the percentage of light passing was obtained through each sample separately. The test of determining total suspended solids was also performed. The results of this experiment showed that there is a quadratic equation between the percentage of light passing and total suspended solids, which is presented as the main equation from figure 3, that is more correlated with the data. As can be seen, at 450 nm, there is a higher correlation between the turbidity and the light transmittance and less error. Manuscript profile -
Open Access Article
9 - Application of Drastic Model in the Studying Process of Industrial Development of Sari Plain
Mohammad rahmani tahere azariNew industrial estates developments must follow the effective factors in protection, management and sustainable development of aquifers and water resources in a plain in order to meet the needs of people. Therefore, assessment of the aquifer vulnerability potential for MoreNew industrial estates developments must follow the effective factors in protection, management and sustainable development of aquifers and water resources in a plain in order to meet the needs of people. Therefore, assessment of the aquifer vulnerability potential for locating new industrial estates settlements is necessary. So, investigation of the vulnerability of Sari plain groundwater resources for locating the industrial zones is necessery. In this research, the risk map of the plain was prepared using a drastic model to assessment of the effective hydrogeological factors in locating the industrial estates of Sari plain. The results of the Drastic model showed that Sari aquifer vulnerability is classified in three groups of highly vulnerable (10.49%,), very highly vulnerable (56.66%) and too highly vulnerable (32.85%). Sensitivity analysis based on two-way single parameter and parameter deletion methods showed that the depth of the water-table factor is the most sensitive factor on the DRASTIC vulnerability index. Sari aquifer is strongly affected by agricultural and industrial activities' pollutants due to shallow water-table; so, the study area is not suitable for establishment of industrial estates based on the final vulnerability map, the aquifer extreme vulnerability potential and the amount of exsisting pollutant. Also, if environmental considerations are not respected by farmers and the existing industrial units in the plain, the aquifer will be suffering serious damages. Manuscript profile -
Open Access Article
10 - Investigation of Gilan index dams' water quality using multivariate methods
Hanieh Mirbolooki Babak Razdar Matin MohafezatkarNowadays, 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 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 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 profile -
Open Access Article
11 - 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
12 - 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
13 - Assessment of trophy status of wetlands in Lorestan province based on Carlson TSI index( Case study: Poldokhtar wetlands, Borujerd corridor and Tanodar Doroud wetlands)
mehdi mehdinasabDetermining the trophy status is one of the assessment and analysis methods of the ecological balance of wetland ecosystems, because the sustainability and continuity of productivity based on these unique ecosystems requires proper monitoring management and control thei MoreDetermining the trophy status is one of the assessment and analysis methods of the ecological balance of wetland ecosystems, because the sustainability and continuity of productivity based on these unique ecosystems requires proper monitoring management and control their environmental conditions because increasing nutrients affect all levels of aquatic ecosystems, including changes in species abundance, migration, reduction of biodiversity, and changes in the structure and composition of communities. Therefore, a suitable method should be used to determine the trophy status, or in other words, the production capacity of an ecosystem. Conventional methods for determining the amount of trophy are based on three physical, chemical and biological parameters. Lorestan province due to its unique construction has unique wetlands, including 11 Poldokhtar wetlands with an area of 142.7 hectares, Bishe Dalan wetland with 913.5 hectares and Tanodar wetland with an area of 1000 hectares. In this study, to evaluate the trophy status, sampling of phosphorus (TP), total nitrogen (TN) concentration or Carlson trophy index (TSI) was used in Poldokhtar, Bishe Dalan and Tanodar for summer and winter of 2019. Based on the annual average of Carlson index, Poldakhtar and Bishe Delan wetlands are in mild mesotrophic trophy conditions and Tanodar wetland is in the eutrophic category. In the wetlands of Lorestan province, the sediment load of suspended solids and water turbidity have been exceeded these wetlands limits and has had destructive effects on the unstable wetlands` body due to the annual entry of large amounts of sediment from the catchment, development of gardens, various recreational withdrawals in Boroujerd and Doroud, increasing the level of river water pollution caused by municipal and industrial wastewater, also, wastes from city and rural recreation centers and wastes from point sources of pollution such as warm water fish breeding ponds. Manuscript profile -
Open Access Article
14 - Designing an Integrated Management Model of Passive Environmental Defense for Drinking Water Supply in Rasht Metropolis
Seyed Abbas Asadi mozhgan zaeimdar Seyed Ali JoziProtecting the drinking water supply chain of metropolises is one of the important issues that all countries should always pay attention to, because any incident in this supply chain can cause irreparable damages. The purpose of this study is to design an integrated man MoreProtecting the drinking water supply chain of metropolises is one of the important issues that all countries should always pay attention to, because any incident in this supply chain can cause irreparable damages. The purpose of this study is to design an integrated management pattern of passive environmental defense in the field of drinking water supply. The current research is in the category of fundamental studies based on the purpose, and used integrated management of passive environmental defense to investigate the integrated management of passive environmental defense of supply sources, treatment plants, transmission lines and drinking water storage tanks in Rasht metropolis. Data collection was done through interviews with experts, and finally, 14 experts were selected among environmental management professors and water experts by snowball sampling method so that the views reach theoretical saturation. MAXQDA 2020 software was used for text analysis, coding (open, central and selective) and categorization and generation of categorical networks. Evaluating the views regarding solutions to reduce and deal with environmental threats in different stages of water supply in Rasht metropolis showed that the solutions can be considered from five aspects of infrastructure, policy making, cultural, technical and human. Finally, according to the data base theory and Strauss and Corbin’s model, the final model of the integrated management of passive environmental defense of drinking water supply in Rasht metropolis including causal conditions, main category, intervening conditions, background factors, strategies and consequences were presented. Manuscript profile -
Open Access Article
15 - Investigating the status of microbial contamination (intestinal enterococcus) of Caspian sea on the coastal recreational waters of Gilan
Aazam Nezamhashemi Ameneh Mansourghanaei Mohammad Vafajoye Diyanati Mousa Amini Toraj SadeghiMicrobial agents are among the most important pollutants that enter the Caspian Sea through untreated urban and rural sewage and cause health risks for swimmers. Intestinal enterococcus causes symptoms of stomach and intestinal inflammation.This research is a descriptiv MoreMicrobial agents are among the most important pollutants that enter the Caspian Sea through untreated urban and rural sewage and cause health risks for swimmers. Intestinal enterococcus causes symptoms of stomach and intestinal inflammation.This research is a descriptive study and was conducted with the aim of investigating the contamination status of enterococcal enterococci in the water of the Caspian Sea coastal recreational waterson the coasts of Gilan province and comparing it with the standards of the environment and the Ministry of Health. 55 samples (each swimming pool, 5 replicates) were sampled from 11 coastal areas of the Caspian Sea in Gilan province in September 1401. Intestinal enterococcus variables, water temperature, pH, salinity and turbidity were measured according to the methods in the standard method book. The results showed that the average number of intestinal enterococcal bacteria per 100 ml of sample showed 52.54 MPN. Comparison of the average number of intestinal streptococci in different stations with the standard of the environment and the Ministry of Health showed that 5 stations (Safir Omid, Sadaf, Gisom, Tashe Abad and Chamkhale) were above the permissible limit. Also, there was a negative correlation between the number of intestinal streptococci and water pH (P<0.05). As a result of this research, it indicates the microbial contamination with intestinal enterococcus in some natural coastal recreational waters on the shores of the Caspian Sea in Gilan province, which can threaten the health of swimmers. Manuscript profile -
Open Access Article
16 - Patterns of Water Quality Changes, Invasive Aquatic Plant Identification and Environmentally Friendly Control Solutions in Drinking Water Dams of Mazandaran Province
Pooyan MehrabanJoubani hadi Modabberi Seid Mohammad MosaviThis study was investigated the patterns of water quality changes and the identification of invasive aquatic plant species in drinking water dams located in Mazandaran province, including Alborz, Shahid Rajaei and Meijran Dams. The best conditions of dissolved oxygen i MoreThis study was investigated the patterns of water quality changes and the identification of invasive aquatic plant species in drinking water dams located in Mazandaran province, including Alborz, Shahid Rajaei and Meijran Dams. The best conditions of dissolved oxygen in Alborz, Shahid Rajaei and Meijran dams were around 10, 10 and 16 mg/L in April, respectively. Due to the thermal stratification created in August and September, the content of dissolved oxygen in all dams at a depth of 7 to 10 meters reached zero. Based on Carlson's index, these dams were eutrophic during these months. The highest amount of phosphate measured in July, August and September was observed in Meijran Dam. However, biological pollution of Alborz and Shahid Rajaei dams were higher than Meijran dam, the biological and chemical oxygen demand of Alborz and Shahid Rajaei dams were about 2 and 2.5 times higher than Meijran dam, respectively. Also, the amount of faecal coliform in Alborz dams was about 2 time compared Meijran dam. Despite the decrease in the amount of total coliform in three dams in September, the amount of faecal coliform in Alborz dam was about 3 times other dams. Two plants, hydrilla and Potamogeton, were observed as the invasive plants in Meijran dam, which seems that cormorant bird are the cause of invasive plants entering the dam. Manuscript profile