نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری مهندسی بهداشت محیط، گروه بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی سبزوار، سبزوار، ایران
2 استاد مهندسی محیط زیست، گروه بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی سبزوار، سبزوار، ایران
چکیده
زمینه و هدف: رشد جمعیت نیاز به تولید بیشتر محصولات کشاورزی را باعث می‌شود و کمبود آب سبب می‌شود بشر به استفاده از آب‌های نامتعارف ازجمله پساب‌ها رو آورد. کیفیت نامناسب پساب‌ها می‌تواند برای خاک، گیاه و سلامت مصرف‌کنندگان مضر باشد بنابراین سنجش و بررسی کیفیت آنها ضروری می‌باشد
مواد و روش‌ها: در این پژوهش فاکتورهایEC, Ca, Mg, Na, SAR, CL, TC, TP, PH, Ecoli, TN, TSS, COD, BOD در پساب تصفیه‌خانه‌های برکه تثبیت، لجن فعال (فاضلاب بهداشتی کارخانه) و پساب وتلند روستایی با روش‌های استاندارد آزمایش شد (مطابق نسخه 2017 کتاب روش‌های استاندارد آزمایش‌های آب و فاضلاب) و با استانداردهای ویلکاکس، آیرزو وستکات،WHO, USEPA وFAO مقایسه گردید. تا صلاحیت مصرف سه نوع پساب متفاوت برای مصارف کشاورزی مشخص گردد.
یافته‌ها: طبق استانداردهای ایران، ویلکاکس، آیرز و وستکات، FAO وWHO هر سه نوع پساب برای مصارف آبیاری با تأثیرات منفی کم تا متوسط قابل استفاده هستند ولی در استانداردهای سخت‌تر (USEPA)، پساب برکه و وتلند حد مجاز فاکتورهای BOD و TSS را تأمین نکرده‌اند و پساب لجن فعال فاکتور BOD را تأمین نکرده است.
نتیجه‌گیری: مطابق نتایج، سیستم تصفیه فاضلاب لجن فعال، بهتر از دو سیستم دیگر استانداردهای مصرف پساب در کشاورزی را تأمین می‌کند. با گذشت زمان استانداردها سختگیرانه‌ترخواهند شد. انتخاب نوع و بهره‌برداری صحیح از سیستم تصفیه در تأمین استانداردهای کیفی پساب برای آبیاری تأثیر بسزایی دارد.
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
Qualitative Study of Effluent of Three Types of Wastewater Treatment Systems from The Perspective of Physicochemical and Microbial Indicators for Use in Agriculture
نویسندگان [English]
- mostafa baghani 1
- Abolfazl Rahmani Sani 2
1 PhD Student in Environmental Health Engineering, Department of Environmental Health, School of Health, Sabzevar University of Medical Sciences, Sabzevar, Iran
2 Professor of Environmental Engineering, Department of Environmental Health, School of Health, Sabzevar University of Medical Sciences, Sabzevar, Iran
چکیده [English]
Introduction: Population growth causes the need to produce more agricultural products. And the lack of water causes people to use unconventional waters, including treated sewage. Improper quality of wastewater can be harmful to the soil, plants and the health of consumers. Therefore, it is necessary to measure and check their quality.
Materials and Methods: In this study, the factors of EC, BOD, COD, TSS, TN, TP, PH, Ecoli, TC, CL,Ca, Mg, Na, SAR in effluent treatment plants, Sabzevar stabilization pond, activated sludge (Factory sanitary wastewater) and rural Wetland with Tested by standard methods. (according to 2017 version of the book Standard Methods for the Examination of Water and Wastewater) and compared with Wilcox, Ayers and Westcot, FAO, WHO, USEPA standards.To determine the competence of three different types of effluent for agricultural use.
Results: In accordence with the standards of Iran, Wilcox, Ayers and Westcot, FAO and WHO, all three types of effluent can be used for irrigation with low to moderate negative impacts. However, in the more stringent standards (USEPA), stabilization pond and Wetland did not meet the BOD, TSS factors threshold, and the activated sludge effluent did not provide the BOD factor.
Conclusion: According to the results, the activated sludge treatment system meets the standards of wastewater consumption in agriculture better than the other two systems. Over time, the standards will become stricter. Choosing the type and correct operation of the treatment system has a significant impact on providing the quality standards of effluent for irrigation.
کلیدواژه‌ها [English]
- Sewage treatment plant effluent"
- Physical
- chemical and microbial factors of effluent"
- agricultural uses"
- "
- irrigation standards"
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