نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد، گروه علوم و مهندسی آب، دانشگاه هرمزگان، بندرعباس، ایران

2 استادیار، گروه علوم و مهندسی آب، دانشکده کشاورزی و منابع طبیعی، دانشگاه هرمزگان، بندرعباس، ایران

3 دانشیار، گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی هرمزگان، بندرعباس، ایران

چکیده

نیترات و ارتوفسفات حاصل از پساب فاضلاب نقش قابل‌توجهی در بار مواد مغذی منابع پذیرنده ایفا می­نماید. ازاین‌رو تخلیه ترکیبات نیتروژن و فسفر به منابع آبی باعث آلودگی آب می­شود. پژوهش حاضر باهدف بررسی کارائی مواد فیلتری طبیعی در حذف نیترات و ارتوفسفات از پساب خروجی یک سامانه تصفیه فاضلاب انجام شد. بدین منظور چهار بیورآکتور با ترکیب مواد فیلتری متفاوت شامل تراشه چوب (W)، تراشه چوب و ماسه­ ساحلی (WS)، تراشه چوب و صدف دریایی (WSS) و تراشه چوب، ماسه ساحلی و صدف­ دریایی (WSSS) ساخته شد. کارائی آن­ها در حذف نیترات و ارتوفسفات در سه زمان نگهداشت هیدرولیکی ۱۲، 18 و  hr24 مورد سنجش قرار گرفت. نتایج نشان داد بالاترین کارایی حذف نیترات و ارتوفسفات به ترتیب به میزان ۱۹/92، 57/96% مربوط به تیمار WSSS است. همچنین در تمامی بیورآکتورها، زمان نگهداشت  hr18 بهترین عملکرد در حذف نیترات و ارتوفسفات باز خود نشان داد. یافته­های این پژوهش حاکی از کارائی بسیار مناسب تراشه چوب در ترکیب با مواد اصلاحی در حذف نیترات و ارتوفسفات بود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Removal of Nitrate and Phosphate from Wastewater Effluent using Packed-Bed Bioreactor Filled with WoodChips, Coastal Sands, and Crushed Seashells

نویسندگان [English]

  • Mohammad Mellatkhah 1
  • Adnan SadeghiLari 2
  • Vali Alipoor 3

1 M.Sc. Alumnus, Department of Water Science and Engineering, Faculty of Agriculture and Natural Resources, University of Hormozgan, Bandar Abbas, Iran

2 Assisst. Professor, Department of Water Science and Engineering, Faculty of Agriculture and Natural Resources, University of Hormozgan, Bandar Abbas, Iran

3 Assoc. Professor, Department of Environmental Health Engineering, Hormozgan University of Medical Sciences, Bandar Abbas, Iran

چکیده [English]

Nitrate and orthophosphate in wastewater effluent have a considerable impact on the nutrient load of water bodies. Therefore, the discharging of nitrogenous and phosphorus compounds into water resources induces water pollution. The present study aimed to investigate the performance of natural materials in removing nitrate and orthophosphate from the effluent of a wastewater treatment plants. For this purpose, four laboratory-scale bioreactors with different combinations of filter materials, including woodchips (W), woodchips-beach sand (WS), woodchips-seashells (WSS), and woodchips-beach sand-seashells (WSSS) were applied to assess the performance of nitrate and orthophosphate removal in three hydraulic retention times of 12, 18 and 24 hr. The results showed that the highest removal performance of nitrate and orthophosphate belongs to the WSSS treatment by 92.19 and 96.57%, respectively. In addition, the retention time of 18 hr had the best performance in removing nitrate and orthophosphate in all bioreactors. The research findings revealed that the woodchips in combination with modifier materials have a excellent performance to remove nitrate and orthophosphate.

کلیدواژه‌ها [English]

  • Natural Materials
  • Nitrogen
  • Phosphorus
  • Retention Time
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