نوع مقاله : مقالات پژوهشی
نویسنده
دانشیار گروه مهندسی مکانیک بیوسیستم، دانشکده کشاورزی، دانشگاه جهرم، جهرم، ایران.
چکیده
زمینه و هدف: با توجه به بالا بودن بار آلایندگی پساب تولیدشده در کارخانه‌ی نشاسته‌سازی و حجم زیاد آن، هدف پژوهش حاضر بررسی کارایی دو منعقدکننده‌ی آهک و سولفات‌آلومینیوم در کاهش بار آلایندگی پساب نشاسته‌سازی و کمک به تصفیه‌خانه در تصفیه‌ی موفق این پساب می‌باشد.
مواد و روش‌ها: این پژوهش جهت افزایش کارایی تصفیه‌خانه‌ی کارخانه‌ی نشاسته‌سازی در فارس در سال 1401 و 1402 در مدت 16 ماه انجام شد. در این مطالعه غلظت بهینه برای دو ماده‌ی منعقدکننده شامل آهک و سولفات‌آلومینیوم به‌صورت جداگانه و ترکیبی مورد بررسی قرار گرفت. فاکتورهای آلاینده مانند اکسیژن‌خواهی شیمیایی، اکسیژن‌خواهی بیوشیمیایی و غیره مورد بررسی قرار گرفت. برای تحلیل داده‌ها از نرم‌افزار 22/ SPSS آزمون دانکن استفاده شد (0/01 =α).
یافته‌ها: با افزایش مصرف آهک و سولفات‌آلومینیوم از 20 میلی‌گرم در لیتر به سمت 40-60 میلی‌گرم در لیتر بازده حذف آلاینده‌ها نیز افزایش می‌یابد. تقریبا بازده کاهش تمام آلاینده‌ها در دوزهای بیشتر از 60 میلی‌گرم در لیتر ثابت بوده و در بسیاری از آن‌ها کمتر از 10 درصد بود. داده‌های بدست‌آمده نشان داد که این دو ماده اثر ترکیبی خوبی با دوز مصرف 40 میلی‌گرم در لیتر آهک و 20 میلی‌گرم در لیتر سولفات‌آلومینیوم داشتند. پس از به‌کارگیری مواد منعقدکننده سطح آلودگی و بارگذاری مواد آلی تا 65% کاهش یافت و به همین نسبت کارایی تصفیه‌خانه نیز بالاتر رفت.
نتیجه‌گیری: می‌توان از فرآیند انعقاد و ته‌نشینى به کمک آهک وسولفات‌آلومینیوم به‌منظور تصفیه‌ی پساب کارخانه نشاسته‌سازى به‌خوبی استفاده کرد. این مواد ارزان و دردسترس بوده و کارخانه‌ها راغب به استفاده از آن‌ها می‌باشند.
کلیدواژه‌ها
عنوان مقاله [English]
Optimization of Chemical Pre-Treatment Using Lime and Aluminum Sulfate Coagulants to Enhance Starch Factory Wastewater Treatment Plant
نویسنده [English]
- Ehsan Houshyar
Department of Biosystems Engineering, Faculty of agriculture, Jahrom University, P.O. Box 74135-111, Jahrom, Iran
چکیده [English]
Background and Purpose: Due to the high pollutant load and high volume of wastewater from starch production factories, the objective of the present study was to evaluate the efficiency of hydrated lime and aluminum sulfate to decrease contaminants of starch wastewater to successful wastewater treatment in the main wastewater treatments plants.
Materials and Methods: The investigation was conducted during 2022 and 2023 over 16 months to improve the operational effectiveness of the wastewater treatment plant at a starch manufacturing factory in Fars province. The optimum dosage of two coagulants, i.e. lime and aluminum sulfate, were tested. Various pollutants were under study, such as chemical oxygen demand and biological oxygen demand, etc. The statistical analysis was conducted in SPSS 22 using Dunkan analysis (α = 0.01).
Results: The effectiveness of removing pollutants was improved while lime and aluminum sulfate rose from 20 mg/L to 40-60 mg/L. The removal efficiency of pollutants was almost constant and enhanced lower than 10% while coagulants were applied higher than 60 mg/L. The optimum lime and aluminum sulfate dosage was 40 mg/L and 20 mg/L, respectively. Following the application of coagulants, there was a notable reduction in the levels of pollutants and organic loading rate by 65% which led to an enhancement in the performance of the wastewater treatment plant.
Conclusion: The coagulation and sedimentation with lime and aluminum sulfate can be utilized for successful starch wastewater treatment. These materials are cost-effective and easily accessible which justifies them as a desirable option for factories seeking wastewater treatment solutions.
Open Access Policy: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/
کلیدواژه‌ها [English]
- Environment
- Pollution
- Starch Factory Wastewater
- Industrial Wastewater
- Coagulation and Flocculation
- Chemical Oxygen Demand
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