بازدهی محلول های شوینده برای خاکشویی آلاینده آرسینک ، تحت تاثیر دما

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، دانشکده عمران و محیط زیست، دانشگاه تهران

2 کارشناس ارشد مهندسی محیط زیست، دانشگاه تهران

چکیده

بیشترین آلودگی خاک ناشی از فلزات سنگین مانند آرسنیک، سرب، جیوه، کروم، کادمیوم است. در این میان آرسنیک با توجه به خصوصیات سرطانزایی و فراوانی آن در خاک که ناشی از فعالیت های کشاورزی، صنعت نفت، پسماند و فاضلاب شهری و صنعتی می باشد از اهمیت ویژه ای برخوردار است. در این تحقیق ، میزان بازدهی روش خاکشویی جهت حذف آرسنیک از نمونه های خاک توسط آب و شوینده های شیمیایی EDTA (Ethylene Diamine Tetraacetic Acid)، SDS (Sodium Dodecyl Sulphate) و شوینده ترکیبی(شامل EDTA و SDS) مورد بررسی قرار کرفت. نتایج آزمایشهای خاکشویی نشان داد محلول های شستشوی آب، EDTA، SDS و شوینده ترکیبی در دمای ˚ C 20 به ترتیب دارای کارایی حذف 82/20 % ، 21/45 % ، 93/37 % و 18/74 % هستند. همچنین کارایی حذف برای شوینده های فوق در دمای ˚ C 50 به ترتیب برابر با 75/24 % ، 34/52 % ، 83/40 % و 48/79 % بدست آمد. نتایج فوق حاکی از کارایی شستشوی خاک به ترتیب " شوینده ترکیبی < < EDTA < SDS آب " در دو دمای ˚ C 20 و ˚ C 50 است. همچنین نتایج بدست آمده افزایش میزان کارایی خاکشویی در حذف آرسنیک با افزایش دما را در هر حالت نشان داد.

کلیدواژه‌ها

عنوان مقاله [English]

The efficiency of cleaning agents at different temperatures in soil washing process for arsenic contamination

نویسندگان [English]

  • saeid gitipour 1
  • Saeid Firouzbakht 2
  • Ehsan Mirzaee 2
  • Iman Khalili 2
1 Associate Professor, Department of Environmental Engineering, Tehran University
2 Graduated in Environmental Engineering, Tehran University
چکیده [English]

The use of heavy metals especially arsenic, lead, cadmium and mercury has led to extensive contamination of soils worldwide. Arsenic, however, is mostly noted because of its carcinogenic and mutagenic characteristics occurred due to the agricultural and industrial activities and the invasion of domestic and industrial wastewater into the soil environment. In this research, the removal efficiency of arsenic by use of soil washing process was assessed and diverse cleaning agents and also temperatures were applied. Water, Ethylene Diamine Tetraacetic Acid (EDTA), Sodium Dodecyl Sulphate (SDS) and a mixture of EDTA and SDS were chosen as the agents to treat the contaminated samples. Regarding the analysis results, it could be observed that efficacy of water, EDTA, SDS, and the mixture solution of SDS and EDTA at 20˚C is 20.82%, 45.21%, 37.93%, and 79.48%, respectively. These results were determined as 24.75%, 52.34%, 40.83%, and 79.48%for treated samples at 50˚C, correspondingly. Consequently, the efficiency of soil washing solutions in the removal of arsenic (at 20˚C and 50˚C) is specified as: "Mixture of EDTA and SDS" ›› "EDTA" ›› "SDS" ›› "Water". Additionally, the investigation of the results showed that by increasing the temperature, the effectiveness of soil washing process would be enhanced.

کلیدواژه‌ها [English]

  • soil washing process
  • arsenic
  • cleaning agents
  • temperature effect

مراجع

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