فصلنامه پژوهش در بهداشت محیط
سال یکم شماره 3 (پاییز 1394)

Bioaugmentation is a great technique in bioremediation of contaminated soils with petroleum hydrocarbons. The aim of this study was to evaluate the effect of isolated bacteria from activated sludge as non-indigenous bacteria in bioremediation of kerosene contaminated soils and study the growth of isolated bacteria in the presence of different concentrations of this product. Sampling of activated sludge was taken from two treatment plants in Assaluyeh region. Isolation of degrading bacteria was performed by culturing the samples on basal mineral medium. Emulsification test and evaluating growth of bacteria were carried out in different concentrations of kerosene. Isolated bacteria were inoculated to polluted soils with kerosene oil compound for bioaugmentation. The evaluation of their bioremediationpotentialand the rate of biodegradation were measured by infrared spectroscopy (IR). In this study, two bacteria Pseudomonas putida and Serratia marcescens were isolated and identified as kerosene degrading bacteria from activated sludge. P. putida was recognized as the most powerful degrading bacterium of this oil product according to emulsification tests, measuring the growth of bacteria in various concentrations of kerosene, the results of Bioaugmentation of contaminated column of soil with kerosene and reduce the level of TPHs. In regard to adaptation of activated sludge bacteria with variety of pollutants in sewage, they can be used as non-indigenous bacteria for bioaugmentation and cleaning up contaminated soil with petroleum hydrocarbons.

Groundwater is one of the exploitation important resources in arid and semi-arid areas. Therefore, the spatial and temporal distribution of groundwater quality is very important. The purpose of this study was to evaluate the accuracy of spatial interpolation methods in order to predict the spatial distribution of some groundwater quality parameters such as TH, Ca, pH, Mg and SO4-2. in this study data related to 44 exploitation wells in Gonabad plain was used. Then, methods of IDW, SK, OK, UK, RBF, LPI and GPI were investigated. After normalizing the data, QQ plot was drawn. Then, in order to select, an appropriate model for fitting, mutual evaluation methods and estimation errors were used that consisted of MBE, RMSE, MARE and MAPE. Finally, the most appropriate interpolation method was chosen. Zoning maps of the water parameters were prepared by using geostatistical methods in GIS software. Final zoning model showed, in the center, the west south, and the west of plain concentration of surveyed parameters have been lower than their mean. By moving from the north, the east north, and the east towards the center, the south, and the west south, the parameters concentrations were decreased. The results showed that kriging method is preferred to other geostatistical methods for zoning of the water quality parameters

water, urban, industrial and agricultural centers are usually held near rivers. Surface water sources over other sources of water pollution are more at risk. The goal of this study was to evaluate the quality of the Zaringol River and the impact of agricultural drainage water was designed and implemented. In regard to agricultural activity around the Zaringol river stations studied and the samples from agricultural drainage water and streams in summer and autumn period specified were taken. NSF WQI index parameters including 9 parameter dissolved oxygen, fecal coliform, pH, BOD, temperature, phosphate, nitrate, turbidity, total dissolved solids, which were measured by using standard methods. The results from the study showed that the index based on NSF WQI for all stations were between 54 to 61. Agricultural water drainage WQI index is between 45-37 that according to the index is poor quality. According to the NSF WQI index indicated that water quality in the river is moderate. But agricultural drainage water quality is bad and affects the quality of river water. Due to the relatively high levels of water quality in the middle class of nutrients, especially nitrates, coliform presence of E.coli that drainage water from agricultural and recreational activities in the upstream station is monitored.

Textile effluents contain significant amounts of toxic and organic pollutants. Due to health risks such as carcinogenic and mutagenic effects, discharge of this kind wastewater to water resources can lead to health impacts. The aim of this study was to survey the efficiency of Chitosan derivative in removal of basic dyes violet16 from aqueous solutions. In this study the influence of different parameters including contact time, initial dye concentration, adsorbent concentration, and PH, was studied. Residual of dye concentration was measured using a spectrophotometer set in 545 nm wavelength. Adsorption data was described by Langmuir and Freundlich isotherms and kinetic reactions. The results showed that increasing contact time and adsorbent dose enhances dye removal rates for this adsorbent. By decreasing initial concentration of dye, removal rates increased. In optimal conditions, Chitosan derivatives were able to remove dye 68 percent respectively. For this adsorbents optimum pH was obtained 10. According to the results, adsorption process for both adsorbents was determined by Freundlich isotherm by R2>0.98. Dye absorption kinetic of both adsorbents followed pseudo second degree by R2>0.98. the results showed that Chitosan derivative can be applied as an efficient adsorbent for removal basic violet 16 dye from aqueous solutions.

In regard to the serious consequences of improper waste disposal, environmental impact assessment techniques are used to evaluate the different scenarios for waste management and minimize the negative impacts. The aim of this study was the use of Iranian Matrix and RIAM to minimize environmental impacts in Qaemshahr landfill and presenting suitable methods for efficient waste management Matrial& In this study, the existing condition of Qaemshahr landfill was compared with human’s environmental criteria for MSW landfills based on Department of the Environment (DOE) of Iran. Meanwhile, EIA of Qaemshahr solid waste landfill was carried out with two methods, RIAM and Leopold Matrix. The upgrading of existing landfill, reconstruction with compost plant and relocation of landfill were evaluated according to physiochemical, physicochemical (PC), biological-ecological (BE), sociological/cultural (SC), economical/operational (EO) economical-social and cultural components. The results showed that Qaemshahr landfill lacks the environmental criteria for MSW landfills. Also, the RIAM and Iranian matrix results indicated that upgrading of existing landfill, construction of compost plant, relocation and construction of the sanitary landfill have total environmental scores as -793 and -2.26, -387 and -2.22, -69 and -0.76 respectively. It is noticeable that the current process of landfill in Qaemshahr will lead to harmful health consequences. So, construction of landfill space (the third option) was chosen as the most suitable option with as little harm as possible on the environment.

Chromium, found in many industrial effluents, is one of most important heavy metal with health and environmental risks. Therefore, the aim of this study is to survey the effect of Cr (VI) removal by using Cyperus rotundus Weed biomass. This empirical study was done in lab scale. The variation of pH, dose of adsorbent, contact time, and concentration of chromium were investigated. The adsorption data was explained by adsorption isotherms and kenitics.The residual concentration was analyzed by spectrophotometer in maximum wavelength of 540 nm. It was determined that the pH value of 3, contact time of 60 min, adsorbent dosage of 4 g/L and Cr (VI) concentration of 10 mg/L were the optimum conditions for adsorbents. The most Cr (VI) removal efficiency of 99% was obtained for Cystoseira indica biomass in optimum conditions. The equilibrium data is best fitted on Langmuir isotherm and the adsorption kinetic model follows pseudo-second model. The maximum capacity of adsorption was 10.12 mg/g. The results revealed that by using Bio-absorption the removal of Cr+6 can be done quickly and effectively.

Parallel to the growth of Population and increasing healthcare needs, the production of medical wastes is constantly increasing. Owing to the poor healthcare waste management, this study surveys the state of waste management in Shariati Hospital of Tehran using IRAT in 2015 as part of WHO's strategy. Matrial&This descriptive study recorded 70 questions asked from environmental health and waste authorities after inspection the implementation waste management law using the IRAT tool. The waste products for sectors were weighed for one month. The average weighing was 1911.68 kg waste production, which included 1.910.314 of infectious waste rate, 2.110.254 of domestic, 0.10.027 of Chemical/Pharmaceutical and 0.080.032 kg/b/d of sharp particles. According to the results, 18% of the bags and safety boxes with the capacity of more than 3/4 were collected with only 34 parts (72%) regular label waste bags. In addition, the hospital manager did not anticipate a specific budget to cover the costs of waste management. According to the IRAT analysis, the final score for the hospital was poor i.e. 50.71% which included 75.9% for separation, 78.9% for collection, 77.8% for transmission and storage and 81.7% for the treatment and disposal. The infectious waste rate, that is 47.27%, seems more than that recommended by WHO. So it is necessary to have more educational programs in the field of waste separation for reducing the source of infections and hazardous wastes. Legal measures should be done to make the authorities of health centers implement the waste management rules.

Because of the diversity in biological conditions on areas with high prevalence of cutaneous leishmaniasis, providing a specific way for controlling disease in all areas is not impractical, so anselection of appropriate disease prevention method for preventing diseases should be selected regardingaccording to the special conditions of each area. This study investigated the effect of physical environment conditions conditions based on the prevalence of cetaceous leishmaniasis in hyperendemic areas in Mashhad, Iran. This census study, with a survey of 2,491 households, were carried out by applying a checklist and observations to evaluate the physical environment conditions and epidemiological factors of cutaneous leishmaniasis in hyperendemic areas in Mashhad in 2012. Data analysis was done with SPSS11.5 software by Chi-square test, and Pvalue less than 0.5 was considered significant. The highest prevalence of cutaneous leishmaniasis was in age group of 10-29 years, in students, college students and housewives people. Poor sanitation, existence of unused land and construction debris near the house and inappropriate yard floor covering (, by creating the suitable circumstances for proliferation sandflies), had a significant relationship with prevalence of leishmaniasis. Building Cconstruction site near the people residence by itself didwas not show a significant difference in patients groups and healthy individuals If there is no accumulation of construction debris, construction by alone have not important effect ion increasing leishmaniasis. Public education. itself has no important effectPublic notification for increasing the awareness of residents of in hyperendemic areas about physical environment risk factors and training of environmental health actions such as rapid collection removal of construction debris and suitable yard flooring can lead to lower prevalence of cutaneous leishmaniasis with the intervention in sandflies living place.