شماره ركورد :
776562
عنوان مقاله :
مقايسه حذف فسفر درگياه ني، بامبو و نخل مرداب
عنوان فرعي :
Comparison of Phosphorus Removal Efficiency in
پديد آورندگان :
آيتي، بيتا نويسنده دانشيار مهندسي عمران (محيط زيست) دانشگاه تربيت مدرس تهران Ayati, Bita , رضامند، شيما نويسنده دانشجوي كارشناسي ارشد مهندسي عمران (محيط زيست) دانشگاه تربيت مدرس تهران Rezamand, Shima , گنجي دوست، حسين نويسنده استاد مهندسي عمران (محيط زيست) دانشگاه تربيت مدرس تهران Ganjidoust, ، Hossien
اطلاعات موجودي :
فصلنامه سال 1394 شماره 0
رتبه نشريه :
علمي پژوهشي
تعداد صفحه :
8
از صفحه :
89
تا صفحه :
96
كليدواژه :
گياه پالايي , حذف , Phytoremediation , بيومس , Phosphorus removal , Biomass , فسفر
چكيده فارسي :
يكي از موارد آلوده كننده آب‌ها هنگام تخليه و پذيرش فاضلاب موادمغذي است كه شامل نيتروژن و فسفر است. چنانچه حد فسفر از حد استاندارد (6 ميلي‌گرم بر ليتر) بيشتر باشد، موجب بروز پديده يوتريفيكاسيون مي شود و بدين ترتيب باعث آلودگي ثانويه آن‌ها به دليل رشد بحراني جلبك‌ها است. در روش گياه پالايي از يك نوع گياه خاص براي حذف، ذخيره، تثبيت، تجزيه يا تبخير مواد آلوده كننده استفاده مي‌شود كه مي توان حتي آن ماده مورد نظر را حذف يا بازيابي يا به عنوان منبع انرژي استفاده كرد. در اين پژوهش از سه گياه ني، بامبو و نخل مرداب براي حذف فسفر در غلظت‌هاي 2، 10، 25، 50، 100، كود كامل از آب در مقياس آزمايشگاهي استفاده شد. در بين گياهان ني و در بين غلظت‌ها 25 بيشترين راندمان را داشتند. درصد حذف كلي با زمان ماند 2 روز براي گياه ني 59، بامبو 5/45 و نخل مرداب 65/30 به دست آمد.
چكيده لاتين :
One of the major water pollution factors in receiving water bodies is the presence of excessive nutrients (nitrogen & phosphorous compounds) due to wastewater discharge to the environment. If phosphorus level exceeds its discharge standard (6 mg/L), it will cause eutirification which resulted in secondary water pollution due to algal blooming crisis. Development of different methods to remove phosphorus from the year 1950 was performed in response to the need of reducing the discharged phosphorus amount to surface waters. Phosphorus is removed using different chemical and biological methods that have disadvantages such as greater capital and operational costs, operational problems, high sludge production and safety operational & maintenance requirement. So phyto-remediation method can be used to overcome these disadvantages. This useful technology is actually a genneric term for several ways in which plants can be used to clean up contaminated soils and water. Considering this fact phyto-remediation is a bioremediation process in which a particular type of plant used to remove, transfer, stabilize, degrade and volatilize of contaminants (such as pathogens, heavy metals, pesticides, solvents, crude oil, arsenic, cyanide and radioactive elements) by accumulation, stabilization, extraction, rhizofiltration, rhizodegradation or volatilization mechanisms. Phytoextraction is the name given to the process where plant roots uptake polltants from the soil and translocate them to their above soil tissues. Rhizofiltration is similar in concept to Phytoextraction but is concerned with the remediation of contaminated groundwater rather than the remediation of polluted soils. The contaminants are either adsorbed onto the root surface or are absorbed by the plant roots. Phytostabilisation is the use of certain plants to immobilise soil and water contaminants. Contaminant are absorbed and accumulated by roots, adsorbed onto the roots, or precipitated in the rhizosphere. Selection of appropriate plant and microbial species, biological accumulation and transmission of pollutants, contaminant concentration and its disposal are the most important factors in phyto-remediation process. Environmental factors including ambient temperature, solar radiation, the presence of nutrients, water and oxygen and the type of material removal will also affect the process. In this study reed, bamboo and umbrella plant were evaluated in removal phosphorus from water in different concentration of 2,10, 25, 50 and 100 ppm in vitro condition (ambient temperature of 23-25 ?C, DO of 4.5 – 6.5 and pH of 6.5- 8.5). According to the results, the maximum phosphorous removal was observed in reed plant pilot at concentration of 25 ppm. The percent removal efficiencies were found to be 17.3, 35.81, 87.94, 78.77, 48.63, 52.4, 92.01 for reed, 15.66, 21.07, 68.08, 57.89, 34.41, 48.33 and 73.69 for bamboo and 15.89, 21.5, 37.23, 32.41, 22.33, 30.48 and 54.47 for umbrella plant at mentioned concentrations, respectively. Overall phosphorous removal for reed plant, bamboo and umbrella plant were 59, 45.5 and 30.65, respectively
سال انتشار :
1394
عنوان نشريه :
مهندسي عمران مدرس
عنوان نشريه :
مهندسي عمران مدرس
اطلاعات موجودي :
فصلنامه با شماره پیاپی 0 سال 1394
كلمات كليدي :
#تست#آزمون###امتحان
لينک به اين مدرک :
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