Elakkiya Elangovan, Niju Subramaniapillai
Department of Biotechnology, PSG College of Technology, Coimbatore, 641004 Tamilnadu India.
3 Biotech. 2021 Feb;11(2):42. doi: 10.1007/s13205-020-02606-6. Epub 2021 Jan 9.
The present study is aimed at analysing the feasibility of bioelectrochemical treatment of bagasse-based paper mill wastewater. Bioelectrochemical treatment was carried out in dual-chambered microbial fuel cell with plain graphite plates as electrodes. Wastewater from sugarcane bagasse storage and washing units of paper mill was used as anolyte. High power density and current density of 53 mW m and 173 mA m at 470 Ω, respectively, could be produced with wastewater treatment efficiency of 85% and coulumbic efficiency of 6%. Whereas, wastewater from pulping and bleaching units of bagasse-based paper mill was not suitable for bioelectrochemical treatment, yielding low power density and current density of 4 mW m and 16 mA m respectively at 10,000 Ω. Later, treating blended wastewater containing bagasse wash water and pulping wastewater in the ratio of 9:1 v/v generated higher power density and current density of 73 mW m/202 mA m, respectively, at 470 Ω, with wastewater treatment efficiency and coulumbic efficiency of 82% and 18%, respectively. Lignin and its derivatives present in pulping wastewater mediated electron transfer leading to high power density. Further, compounds in pulping wastewater were also toxic to methanogens growth in anode chamber of MFC, resulting in improved coulumbic efficiency of the blended wastewater treatment.
本研究旨在分析基于蔗渣的造纸厂废水生物电化学处理的可行性。生物电化学处理在以普通石墨板为电极的双室微生物燃料电池中进行。造纸厂甘蔗渣储存和洗涤单元的废水用作阳极电解液。在470Ω时，可分别产生53 mW/m²的高功率密度和173 mA/m²的电流密度，废水处理效率为85%，库仑效率为6%。然而，基于蔗渣的造纸厂制浆和漂白单元的废水不适用于生物电化学处理，在10000Ω时，功率密度和电流密度分别低至4 mW/m²和16 mA/m²。后来，以9:1 v/v的比例处理含有蔗渣洗涤水和制浆废水的混合废水，在470Ω时分别产生了73 mW/m²/202 mA/m²的更高功率密度和电流密度，废水处理效率和库仑效率分别为82%和18%。制浆废水中存在的木质素及其衍生物介导电子转移，从而产生高功率密度。此外，制浆废水中的化合物对微生物燃料电池阳极室中产甲烷菌的生长也有毒性，导致混合废水处理的库仑效率提高。
