Energetic and economic assessment of electrocoagulation-flocculation process for separation of microalgae biomass
Publish place: 13th National Congress of Mechanical Biosystems Engineering and Mechanization of Iran
Publish Year: 1400
نوع سند: مقاله کنفرانسی
زبان: English
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NCAMEM13_106
تاریخ نمایه سازی: 18 آبان 1400
Abstract:
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.
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Authors
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