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" ارزیابی کمی و کیفی پساب مزارع پروزش ماهی شاخه گرگر و تاثیر آن بر رودخانه کارون "
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18859521
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| شماره مدرک
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۵۶۶۹۱
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| نام عام مواد
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[گزارش نهایی -ویژه]
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| شناسه افزوده
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دهقان‌مدیسه، سیمین
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طاهرزاده، محمدحسین
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| عنوان اصلي
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ارزیابی کمی و کیفی پساب مزارع پروزش ماهی شاخه گرگر و تاثیر آن بر رودخانه کارون
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| عنوان اصلي به زبان ديگر
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:Qauantity and quality investigation on effecting of warm-water fish farming drainage on Gargar branch and its effects on Karoun River
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| صفحه شمار
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۱۶۵ ص.:مصور، جدول، نمودار، نقشه
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| وضعیت انتشار
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تهران: موسسه تحقيقات علوم شیلاتی کشور، پژوهشکده آیزی پروزی جنوب کشور، ۱۳۹۸
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شماره ثبت ۵۶۶۹۱ مورخ ۱۳۹۸/۱۰/۰۱
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شماره طرح ۹۵۰۳۳-۰۵۱-۱۲-۷۴-۰۱۴
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شماره نامه: سامانه سمپات
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۵۶۶۹۱
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| شماره ثبت
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۴۲۹۳
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| خلاصه یا چکیده
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این مطالعه با هدف بررسی کمی و کیفی مزارع پرورش ماهی شاخه گرگر و تاثیر آن بر سلامت رودخانه کارون انجام شده است...
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The aim of this study was to investigate the quantitative and qualitative effects of Gragar river fish farming andits impact on Karun River health. Field sampling started from February 2015 and continued for a year in thestudied area. From 7 stations (1 station before river dividing in Shushtar city and 4 stations along the GargarRiver and 1 station from the Shutait Karun Branch and finally 1 station in Large Karoon after the connecting thethree branches of Shutait , Gargar and Dez). Stations 3 and 4 were located at the point of discharge of effluentfrom fish farms. Mmonthly regular sampling of water, coliforms, sediment ,macrobenthos and phytoplanktonwere carried out. Many types of quality indices based on water, sediment and biotic communities have beenused to assess river quality statuss. Based on the results, aquaculture wastewater influences the water quality ofthe river, but the meagnitude of this effects as the only source to produce a significant effect on the riverecosystem is less and the more meaningful effects are observed in the discharge points. The most importanteffects of fish farms drainage on water resources, are increasing the amount of nutrients and the growth rate ofalgae, which ultimately leading to occuring eutrophication in the river, in which the algal bloom were notobserved in this study. Considering the importance of phosphorus as a limiting parameters of primary productionin freshwater sources, the amount of phosphorus in the river was much lower than the eutrophy threshold (2-4mg / l). According to the results of the Streeter-Phelps self purification equation, in the interval betweenwastewater drainage and the final station, it is concluded that if aquaculture waste was continuously enteredinto the Gargar branch with current conditions , due to the aeration velocity And river self-purification, theoxygen deficite from oxygen consumption in oxygenated activities does not pose a risk to river life, and the levelof dissolved oxygen in the river is higher than the minimum of aquatic life standard l (4 milligrams per liter).The results showed that Station 2, after the wastewater discharge site in Shushtar, has the highest of the totalbacterial count and generally, in all stations are higher than the standard limit. Also, the total number of coliformand fecal coliform in all stations was higher than the allowable discharge of wastewater and different uses, whichsuggests that the sources of pollutants in the river are numerous in terms of the total bacterial count and is notlimited to waste water from fish farms. It can be concluded that, although water bacterial flora is affected byhuman and agricultural activities, fish farms effluent is not considered as the only source of bacterialcontamination for the river. The numerical value of the Saprobic index based on phytoplankton, which is themost relevant biological index with water nutrient content, all stations are classified in the qualitative class (II),or beta mesosaprob with a moderate level of contamination, and the results of Palmer index showed , stations 3,4, 5 and 7 are categoried in the group of organic materials contamination. According to the results of biologicalindices based on Benthic communities (BMWP, ASPT, HFBI), the quality of the Gregar River was classifiedin unfavorable and poor condition, which is obviously due to the burden of human intervention on the river'sbody and is not necessarily due to fish wastewater, because The eutrophy condition due to the entry of nutrientsfrom the farm effluent in any of the studied stations have not been observed. Since the indices associated withsediment parameters can express a longer history of river quality, and since the source of organic contaminationof the river can not be solely due to fish waste, It can indicate different sources that affect on quality of theriver in addition to aquaculture. Also , station 6 located in shutate branch without any aquaculture activityshowed similar qualitative result. Fish-farming ponds can be one of the sourcess contributing to increasingnutrient concentrations in the Gargar river. Of course, in this case, other factors such as increasing temperatureand evaporation, reducing water volume of the river, entering urban and rural wastewater and agriculture alsoaffect the concentration of pollutants in the aquatic environment. Therefore, reducing the water quality andincreasing the nutrient content in the Gargar River is not attributed solely to the effluent from the fish farms. Thequality status of the Gargar River water is classified in the qualitative class of 2-3 which describes the lowpollution and the results of the WQI, except for station 4 in the wastewater entry point, which has a moderatequality, all other stations are categoried in good quality class It is recommended that wastewater treatmentsystems must be used to reduce pollutants and not be necessarily reduced aquaculture production volumes. It isalso suggested that must be pay attention to the capacity of river dilution and self-purification for issuingpermits. It should be noted that other factors, such as the type of water using , also affect water quality and theirimpact on water quality can not be ignored for assessment and all changes in the communities and water qualityare not solely effected by aquaculture.Keywords: Aquaculture wastewater, Karoun River, Gargar River, Quality indices
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