Reduction of the environmental footprint of thermo‐alkali pretreatment by reusing black liquor during anaerobic digestion of lignocellulosic biomasses

2021 ◽  
Author(s):  
Christine Peyrelasse ◽  
Prasad Kaparaju ◽  
Audrey Lallement ◽  
Melissa Marques ◽  
Florian Monlau
Keyword(s):  
Anaerobic Digestion ◽  
Black Liquor ◽  
Environmental Footprint ◽  
Alkali Pretreatment

Enhancing degradation and biogas production during anaerobic digestion of food waste using alkali pretreatment

2020 ◽  
Vol 188 ◽  
pp. 109743 ◽  
Author(s):  
Chen Linyi ◽  
Qin Yujie ◽  
Chen Buqing ◽  
Wu Chenglong ◽  
Zheng Shaohong ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Biogas Production ◽  
Alkali Pretreatment

Enhancing the anaerobic digestion of corn stover by chemical pretreatment with the black liquor from the paper industry

2020 ◽  
Vol 306 ◽  
pp. 123090 ◽  
Author(s):  
Haipeng Xu ◽  
Yan Li ◽  
Dongliang Hua ◽  
Yuxiao Zhao ◽  
Hui Mu ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Corn Stover ◽  
Paper Industry ◽  
Black Liquor ◽  
Chemical Pretreatment

Treatment of Cotton Pulp Black Liquor Using Micro-Electrolysis in Sequencing Batch Reactor

2012 ◽  
Vol 500 ◽  
pp. 180-186
Author(s):  
Ting Duan ◽  
Mei Yan Xing ◽  
Ming Zhuo Li ◽  
Zheng Zhong Liu ◽  
Wen Liu ◽  
...  
Keyword(s):  
Reaction Time ◽  
Anaerobic Digestion ◽  
Sequencing Batch Reactor ◽  
High Efficiency ◽  
Batch Reactor ◽  
Black Liquor ◽  
Operating Cost ◽  
Volume Ratio ◽  
Land Occupation ◽  
Coagulation Process

Micro-electrolysis process was conducted to treat the anaerobic digestion effluent of cotton pulp black liquor in sequencing batch reactor (SBR). Three key factors including reaction time, pH, and iron-carbon volume ratio were investigated for their impacts on the treatment efficiency. The effluent of micro-electrolysis polished by coagulation process was performed with Al2(SO4)3and PAC as coagulators. The results show that the optimum conditions of the micro-electrolysis treatment were pH 5.5, iron-carbon volume ratio 1:1, and reaction time 8h. Al2(SO4)3was selected as the coagulator with the addition of 400mg/L. The removal efficiency of COD reaches 93.2% with Micro-electrolysis combined with coagulation process. In addition, the B/C ratio has risen from 0.016 to 0.68(>0.3), which creates favorable conditions for the subsequent aerobic process. Consequently, the micro-electrolysis and coagulation process are highly efficient to dispose the anaerobic digestion effluent of cotton linters pulp black liquor. What’s more, this technology has the advantages of low operating cost, small land occupation and high efficiency.

Enhanced Biogas Production in the Duckweed Anaerobic Digestion Process

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Hongyan Ren ◽  
Nan Jiang ◽  
Tao Wang ◽  
M. Mubashar Omar ◽  
Wenquan Ruan ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Production ◽  
Methane Yield ◽  
Mixed Substrates ◽  
Excess Sludge ◽  
Alkali Pretreatment ◽  
Gas Generation ◽  
Digestion Process ◽  
Substrate To Inoculum Ratio ◽  
Group 1

In order to enhance biogas production in the anaerobic digestion of duckweed, and duckweed with excess sludge as single and mixed substrates, the effects of hot alkali pretreatment and variation of the ratio of substrate to inoculum were investigated. The results showed that the delayed stage of anaerobic gas generation could be shortened when the two substrates were mixed during methane production, to give a cumulative gas yield of 2963 mL, which was 11% higher than the calculated value for the complementary substrate. The methane content was 57%, which was 13% higher than that from the duckweed group and 9% higher than from the excess sludge group. Furthermore, the methane yield was improved by 8% after the duckweed was pretreated with hot alkali. When the substrate to inoculum ratio was 1:1, the maximum biogas production of 3309 mL was achieved, with a methane yield of 1883 mL which, respectively, increases of 151 mL and 304 mL compared with the worst group (1:2.5).

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