ارزیابی شاخص‌های آلودگی چند سیستم تصفیه فاضلاب با تأکید بر غلظت فلزات سنگین

یزدان پناه, نجمه

doi:10.22034/jewe.2021.250097.1432

نوع مقاله : مقاله پژوهشی

نویسنده

نجمه یزدان پناه

دانشیار، گروه مهندسی آب، واحد کرمان، دانشگاه آزاد اسلامی، کرمان، ایران

https://doi.org/10.22034/jewe.2021.250097.1432

چکیده

پژوهش حاضر با هدف بررسی کیفیت پساب فاضلاب و تعیین غلظت عناصر سنگین انجام شد. به این منظور، قبل و بعد از چهار سیستم تصفیه فاضلاب در روستاهای اطراف زرند به اسامی ده‌میلان، حتکن، سرباغ و سکوکان، هر یک در 10 مرحله و در فواصل زمانی یک‌هفته‌ای و در مجموع تعداد 80 نمونه برداشت شد. مقادیر BOD، COD، TOC، EC، TSS، TDS، DO، TKN،TP، pH، درجه حرارت، کدورت و قلیاییت و همچنین غلظت عناصر سنگین کادمیوم، روی، سرب، نیکل و مولیبدن به روشهای استاندارد اندازهگیری و نسبت به حدود مجاز سازمان محیط‌زیست مقایسه شد. نتایج نشان داد که در تمام سیستمهای تصفیه، غلظت کادمیوم و سرب در خروجی نسبت به ورودی سیستم بهترتیب بین 5/17 تا 4/37 و 5/0 تا 60% کاهش و غلظت نیکل بین 7/8 تا 7/59% افزایش یافت. مقدار BOD و COD در خروجی اغلب سیستم‌های تصفیه موردمطالعه به‌ترتیب تا حداکثر 9/283 و 3/271% بیشتر از حد مجاز بود. همچنین همه سیستم‌ها غیر از دهمیلان مواد معلق را نسبت به حد مجاز کاهش داد. مقدار TP و DO در خروجی سیستم‌ها نسبت به حد مجاز افزایش و مقدار pH و کدورت کاهش یافت. در خروجی تمام سیستمهای تصفیه، غلظت کادمیوم، روی، سرب و نیکل کمتر از حد مجاز (به‌ترتیب تا حداکثر 58، 4/82، 7/97 و 2/85%) ولی غلظت مولیبدن بیشتر از حد مجاز بود.

کلیدواژه‌ها

موضوعات

محیط زیست

عنوان مقاله [English]

Evaluation of Pollution Indices in Some Wastewater Treatment Plants Emphasizing on the Concentration of Heavy Metals

نویسنده [English]

Najme Yazdanpanah

Assoc. Professor, Department of Water Engineering, Kerman Branch, Islamic Azad University, Kerman, Iran

چکیده [English]

The aim of this study was to investigate the quality of wastewater and to determine the concentration of heavy elements. For this purpose, wastewater samples were collected before and after four wastewater treatment systems in the villages around Zarand named Dehmilan, Hatkan, Sarbagh and Sekukan, each in 10 stages and at one-week intervals; a total of 80 samples were prepared. Different parameters including BOD, COD, TOC, EC, TSS, TDS, DO, TKN, TP, pH, Temperature, turbidity, and alkalinity and also the concentrations of Cd, Zn, Pb, Ni and Mo were measured using the standard methods and were compared with the permissible concentration of Iran Department of Environment. The results showed that after treatment in all the studied systems, the concentrations of Cd and Pb were reduced from 17.5 and 37.4 to 0.5 and 60.0%, respectively, whereas the concentration of Ni increased 8.7-59.7%. The amount of BOD and COD in the effluent of most of the studied treatment systems were up to 283.9 and 271.3% higher than the permissible levels, respectively. Furthermore, in all the treatment plants except Dehmilan, TSS decreased to less than the permissible level. Moreover, in comparison with the standard levels, the amount of TP and DO increased while pH and turbidity decreased. In the effluent of all treatment plants, the concentrations of Cd, Zn, Pb and Ni were less than the permissible limits (up to a maximum of 58.0, 82.4, 97.7 and 85.2%, respectively), whereas the concentration of Mo was higher than the permissible level.

کلیدواژه‌ها [English]

Effluent
Heavy Metals
Pollution
Threshold Level
Water Quality

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محیط زیست و مهندسی آب

ارزیابی شاخص‌های آلودگی چند سیستم تصفیه فاضلاب با تأکید بر غلظت فلزات سنگین

مراجع

مراجع

دوره 7، شماره 4
دی 1400
صفحه 555-566

ارزیابی شاخص‌های آلودگی چند سیستم تصفیه فاضلاب با تأکید بر غلظت فلزات سنگین

مراجع

مراجع

دوره 7، شماره 4دی 1400صفحه 555-566

دوره 7، شماره 4
دی 1400
صفحه 555-566