Energetic and economic assessment of electrocoagulation-flocculation process for separation of microalgae biomass

سال انتشار: 1400
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 306

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شناسه ملی سند علمی:

NCAMEM13_106

تاریخ نمایه سازی: 18 آبان 1400

چکیده مقاله:

The high energy input for harvesting biomass makes current commercial microalgae biodiesel production economically unfeasible. In this study, the effect of current intensity, electrode gap, application time, stirring speed and electrode material on the recovery efficiency, energy consumption, amount of electrode dissolution and operation costs was investigated in batch tests. In addition the optimization of recovery of Dunaliella salina microalgae by the electrocoagulation-flocculation (ECF) process was conducted using multifactor response surface methodology (combining categorical with numeric factors) based on the D-optimal design. The results indicated that, maximum microalgae recovery efficiency achieved up to ۹۸.۰۶% with, electrical energy consumption of ۲.۴ kWh kg-۱; electrodes dissolution of ۱۷.۱۱۷ mmol L-۱; electrical energy consumption costs of ۰.۰۳۳ $ kg-۱; electrodes dissolution costs of ۰.۹۸ $ kg-۱ and the total consumption cost of ۱.۰۱۳ $ per kg of microalgae biomass. Multiple response optimization for maximizing recovery efficiency, and minimizing energy consumption and electrodes dissolution showed ۹۳.۸۴% recovery efficiency with electrical energy consumption of ۰.۳ kWh kg-۱; electrodes dissolution of ۵.۳ mmol L-۱; electrical energy consumption costs of ۰.۰۰۴ $ kg-۱; electrodes dissolution costs of ۰.۲۸ $ kg-۱ and the total operation cost of ۰.۲۸۴ $ per kg of microalgae biomass with aluminum as electrode material. Results of the prediction models were validated through laboratory scale batch experiments.

نویسندگان

Heydar Mohammad-Ghasemnejad Maleki

Biosystems Engineering Department, Shoushtar Branch, Islamic Azad University, Shoushtar, Iran

Morteza Almassi

Biosystems Engineering Department Science and Research Branch, Islamic Azad University, Tehran, Iran

Saeid Minaei

Biosystems Engineering Department Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran