مطالعه لایسیمتری انتقال باکتری فکال کلی فرم در آبیاری قطره ای

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد گروه آبیاری و زهکشی دانشکدة کشاورزی دانشگاه تربیت مدرس

2 دانشیار مؤسسة تحقیقات فنی و مهندسی کشاورزی

3 دانشیار گروه آبیاری و زهکشی دانشکدة کشاورزی دانشگاه تربیت مدرس

چکیده

کمبود منابع آب شیرین یکی از نگرانی‌های رو به فزونی در سراسر جهان است. کمبود آب برای کشاورزی از دغدغه‌‏های بسیار مهم در نواحی خشک و نیمه‏خشک به شمار می‌رود. فاضلاب‏های شهری تصفیه‌شده منبعی مهم برای این منظورند. فاضلاب حتی پس از تصفیه ممکن است حاوی انواع مختلف میکروارگانیسم‏ها باشد که برای انسان و محیط زیست خطرناک‌اند. بنابراین، پتانسیل انتقال آلودگی مسئله‌ای جدّی در زمینة استفاده از فاضلاب تصفیه‌شده برای کشاورزی است. بدین منظور می‏توان از روش‏های نوین آبیاری در ارتباط با فاضلاب تصفیه‌شده برای کشاورزی بهره برد. در این پژوهش انتقال فکال کلی‏فرم موجود در پساب تصفیه‌شده در ستون‏های آزمایشگاهی به قطر داخلی 30 و ارتفاع 60 سانتی‏متر، که یکی به سیستم آبیاری قطره‏ای سطحی (DI) و دیگری به سیستم آبیاری قطره‏ای زیرسطحی (SDI) مجهز بودند، ارزیابی شدند. بدین منظور پس از هر بار آبیاری از زهاب خروجی و محلول خاک در هر ستون نمونه‏برداری شد. نتایج نشان داد در هر دو ستون جمعیت باکتری بیشتر می‌شود. با این حال، تفاوتی معنا‏دار بین میزان باکتری در زهاب خروجی از دو ستون وجود نداشت. همچنین میزان آلودگی لایة 15 سانتی‏متری زیر سطح خاک در ستون SDI نسبت به ستون DI کمتر بود.

کلیدواژه‌ها

عنوان مقاله [English]

Lysimeter study of Fecal Coliform Transport in Treated Wastewater under Drip Irrigation

نویسندگان [English]

  • Foroogh Abbasi Tashnizi 1
  • Fariborz Abbasi 2
  • Mahdi Koochakzadeh 3
1 Former Graduate Student, Faculty of Agriculture, Tarbiat Modares University
2 Associae Professor,Agricultural Engineering and Techology Institute
3 Associate Professor, Faculty of Agriculture, Tarbiat Modares
چکیده [English]

Shortage of fresh water resources is a major worldly concern. Accessibility of water for
irrigation purposes is also one of the most important concerns in arid and semiarid
regions. This is why treated domestic wastewater is thought of as an important water
source. Even following treatment, wastewater may contain a great many kinds of
microorganisms hazardous to humans and environment. Therefore the potential
transmission of pollution is a principle problem associated with the use of treated
wastewater in agriculture. Various irrigation techniques can be employed, associated with
treated wastewater used in agriculture. Accordingly, the present study was conducted on
Fecal Coliform in the wastewater treatment in some laboratory columns of 30 cm
diameter and 60 cm height irrigated, using surface Drip Irrigation (DI) vs Subsurface
Drip Irrigation system (SDI). Samples of the effluent and soil solutions were collected
from each column after each irrigation event. Results revealed that crowds of bacteria
rose in either column. There were no significant differences observed between crowds of
bacteria in the effluents of columns in the two irrigation systems. It was also observed
that contamination in the 15 cm layer, in SDI was lower than that in the DI column.

کلیدواژه‌ها [English]

  • Soil Column
  • Surface drip irrigation
  • Subsurface drip irrigation
  • Microbial contamination

مراجع

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