In Situ Biogas Upgrading and Fertilizer Recovery in Anaerobic Digestion from Laminaria Hydrothermal Carbonization Process Water by Fe-Modified Hydrochar

2020 ◽  
Vol 8 (36) ◽  
pp. 13623-13633
Author(s):  
Fengbo Wang ◽  
Jing Wang ◽  
Ying Han ◽  
Jingping Lu ◽  
Shuaijun Zan ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Hydrothermal Carbonization ◽  
Process Water ◽  
Biogas Upgrading ◽  
Carbonization Process ◽  
Fertilizer Recovery

scholarly journals H2 addition through a submerged membrane for in-situ biogas upgrading in the anaerobic digestion of sewage sludge

2019 ◽  
Vol 280 ◽  
pp. 1-8 ◽  
Author(s):  
Natalia Alfaro ◽  
María Fdz-Polanco ◽  
Fernando Fdz-Polanco ◽  
Israel Díaz
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Biogas Upgrading ◽  
H2 Addition

scholarly journals In-situ biogas upgrading during anaerobic digestion of food waste amended with walnut shell biochar at bench scale

2017 ◽  
Vol 35 (6) ◽  
pp. 669-679 ◽  
Author(s):  
Jessica L Linville ◽  
Yanwen Shen ◽  
Patricia A Ignacio-de Leon ◽  
Robin P Schoene ◽  
Meltem Urgun-Demirtas
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Potassium Concentration ◽  
Operating Mode ◽  
Ash Content ◽  
Walnut Shell ◽  
Process Stability ◽  
Biogas Upgrading ◽  
Bench Scale

A modified version of an in-situ CO2 removal process was applied during anaerobic digestion of food waste with two types of walnut shell biochar at bench scale under batch operating mode. Compared with the coarse walnut shell biochar, the fine walnut shell biochar has a higher ash content (43 vs. 36 wt%) and higher concentrations of calcium (31 vs. 19 wt% of ash), magnesium (8.4 vs. 5.6 wt% of ash) and sodium (23.4 vs. 0.3 wt% of ash), but a lower potassium concentration (0.2 vs. 40% wt% of ash). The 0.96–3.83 g biochar (g VSadded)-1 fine walnut shell biochar amended digesters produced biogas with 77.5%–98.1% CH4 content by removing 40%–96% of the CO2 compared with the control digesters at mesophilic and thermophilic temperature conditions. In a direct comparison at 1.83 g biochar (g VSadded)-1, the fine walnut shell biochar amended digesters (85.7% CH4 content and 61% CO2 removal) outperformed the coarse walnut shell biochar amended digesters (78.9% CH4 content and 51% CO2 removal). Biochar addition also increased alkalinity as CaCO3 from 2800 mg L-1 in the control digesters to 4800–6800 mg L-1, providing process stability for food waste anaerobic digestion.

scholarly journals Microbial Electrochemical Oxidation of Anaerobic Digestion Effluent From Treating HTC Process Water

2021 ◽  
Vol 3 ◽  
Author(s):  
Shixiang Dai ◽  
Benjamin Korth ◽  
Carsten Vogt ◽  
Falk Harnisch
Keyword(s):  
Anaerobic Digestion ◽  
Oxygen Demand ◽  
Community Analysis ◽  
Hydrothermal Carbonization ◽  
Cod Removal ◽  
Microbial Community Analysis ◽  
Process Water ◽  
Material Synthesis ◽  
Current Production ◽  
High Chemical Oxygen Demand

Hydrothermal carbonization (HTC) is a promising technology for chemical and material synthesis. However, HTC produces not only valuable solid coal-materials but also yields process water (PW) with high chemical oxygen demand (COD) that requires extensive treatment. Anaerobic digestion (AD) has been used for initial treatment of HTC-PW, but the AD effluent is still high in COD and particles. Here, we show that microbial electrochemical technologies (MET) can be applied for COD removal from AD effluent of HTC-PW. Bioelectrochemical systems (BES) treating different shares of AD effluent from HTC-PW exhibited similar trends for current production. Thereby, maximum current densities of 0.24 mA cm−2 and COD removal of 65.4 ± 4.4% were reached (n = 3). Microbial community analysis showed that the genus Geobacter dominated anode biofilm and liquid phase of all reactors indicating its central role for COD oxidation and current generation.

scholarly journals Assessment of Integration between Lactic Acid, Biogas and Hydrochar Production in OFMSW Plants

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6593
Author(s):  
Lucio Zaccariello ◽  
Maria Laura Mastellone ◽  
Luisa Ida D’Amelia ◽  
Michelina Catauro ◽  
Biagio Morrone
Keyword(s):  
Lactic Acid ◽  
Anaerobic Digestion ◽  
Lactic Acid Production ◽  
Hydrothermal Carbonization ◽  
Added Value ◽  
Operating Costs ◽  
Waste Streams ◽  
Carbonization Process ◽  
Alternative Systems ◽  
Interesting Solution

Biological treatments such as anaerobic digestion and composting are known to be the most widespread methods to deal with Organic Fraction of Municipal Solid Waste (OFMSW). The production of biogas, a mix of methane and carbon dioxide, is worth but alone cannot solve the problems of waste disposal and recovery; moreover, the digestate could be stabilized by aerobic stabilization, which is one of the most widespread methods. The anaerobic digestion + composting integration converts 10% to 14% of the OFMSW into biogas, about 35–40% into compost and 35–40% into leachate. The economic sustainability could be rather increased by integrating the whole system with lactic acid production, because of the high added value and by substituting the composting process with the hydrothermal carbonization process. The assessment of this integrated scenario in term of mass balance demonstrates that the recovery of useful products with a potentially high economic added value increases, at the same time reducing the waste streams outgoing the plant. The economic evaluation of the operating costs for the traditional and the alternative systems confirms that the integration is a valid alternative and the most interesting solution is the utilization of the leachate produced during the anaerobic digestion process instead of fresh water required for the hydrothermal carbonization process.

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