Gradient electro-processing strategy for efficient conversion of harmful algal blooms to biohythane with mechanisms insight
Gradient electro-processing strategy for efficient conversion of harmful algal blooms to biohythane with mechanisms insight
复制标题
梯度电处理策略可有效地将有害藻华转化为生物乙烷，并具有机制洞察力
DOI：
10.1016/j.watres.2022.118929
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发表时间：
2022
期刊：
影响因子：
12.8
通讯作者：
Shih-Hsin Ho
中科院分区：
文献类型：
--
作者：
Haixing Chang;Haihua Wu;Lei Zhang;Wenbo Wu;Chaofan Zhang;Nianbing Zhong;Dengjie Zhong;Yunlan Xu;Xuefeng He;Jing Yang;Yue Zhang;Ting Zhang;Qiang Liao;Shih-Hsin Ho
• 梯度电处理将有害藻华(HAB) 转化为生物乙烷。 • 在0.888 mA/cm 2 以下的低能耗下，实现了98.59% 的HAB 去除率。 • 能量产量达到50.1 kJ/L，转换效率达到44.78%。 • 揭示了HAB 去除和生物乙烷转化的机制。全球爆发的有害藻华（HAB）对水生生态系统和人类健康造成了许多负面影响。通过暗发酵（DF）将HAB转化为生物乙烷是同时解决环境和能源问题的一种有前途的方法，但低HAB的收获效率和生物乙烷生产力严重阻碍了其应用。在这里，我们设计了一种用于高效收获和破坏HAB的梯度电处理策略，其具有无二次污染和高经济可行性的固有优势。首先，向HABs悬浮液提供低电流密度（0.888-4.444 mA/cm 2 ），通过电絮凝收获生物质，收获效率达到98.59%。构建了考虑多因素耦合影响HABs收获的数学模型，指导大规模应用。然后，在较高电流密度（44.44 mA/cm 2 ）下通过电氧化破坏收获的HAB生物质，以提高DF的生物利用度。结果，在6 min电氧化下获得了64.46 mL/(g VS)和171.82 mL/(g VS)的氢气和甲烷产率，以及最高的能量产率(50.1 kJ/L)和能量转换效率(44.87%)。揭示了梯度电处理下 HAB 的收获和破坏机制，以及从 HAB 到生物乙烷的转化途径。总之，这项工作为有效处置有害细菌提供了一种有前景的策略，并具有生物乙烷生产的额外优势。
• Gradient electro-processing converted harmful algal blooms (HABs) into biohythane. • 98.59% of HABs removal was achieved with low energy cost under 0.888 mA/cm 2 . • 50.1 kJ/L of energy yield with conversion efficiency of 44.78% was achieved. • Mechanisms of HABs removal and biohythane conversion were revealed. Globally eruptive harmful algal blooms (HABs) have caused numerous negative effects on aquatic ecosystem and human health. Conversion of HABs into biohythane via dark fermentation (DF) is a promising approach to simultaneously cope with environmental and energy issues, but low HABs harvesting efficiency and biohythane productivity severely hinder its application. Here we designed a gradient electro-processing strategy for efficient HABs harvesting and disruption, which had intrinsic advantages of no secondary pollution and high economic feasibility. Firstly, low current density (0.888-4.444 mA/cm 2 ) was supplied to HABs suspension to harvest biomass via electro-flocculation, which achieved 98.59% harvesting efficiency. A mathematic model considering coupling effects of multi-influencing factors on HABs harvesting was constructed to guide large-scale application. Then, the harvested HABs biomass was disrupted via electro-oxidation under higher current density (44.44 mA/cm 2 ) to improve bioavailability for DF. As results, hydrogen and methane yields of 64.46 mL/ (g VS) and 171.82 mL/(g VS) were obtained under 6 min electro-oxidation, along with the highest energy yield (50.1 kJ/L) and energy conversion efficiency (44.87%). Mechanisms of HABs harvesting and disruption under gradient electro-processing were revealed, along with the conversion pathways from HABs to biohythane. Together, this work provides a promising strategy for efficient disposal of HABs with extra benefit of biohythane production.