Comprehensive experimental study on energy conversion of household kitchen waste via integrated hydrothermal carbonization and supercritical water gasification

Conversion of food waste to energy: A focus on sustainability and life cycle assessment

Combined acid pretreatment and co-hydrothermal carbonization to enhance energy recovery from food waste digestate

A review on hydrothermal carbonization of potential biomass wastes, characterization and environmental applications of hydrochar, and biorefinery perspectives of the process.

Supercritical water gasification (SCWG) is a remarkably efficient technology for converting wet biowaste (such as food waste, paper industrial waste, sewage sludge, agricultural waste, and forestry residue) into energy in the form of hydrogen-rich syngas. Catalysts have been widely used for promoting the hydrogen production rate of SCWG at mild reaction temperatures. In this regard, transition metal-based catalysts have attracted extensive attention from researchers due to their excellent performance and recyclability. Herein, the catalytic effects of transition metal-based catalysts on the SCWG of biowaste are reviewed, including the influence of active components, synthetic methods, and support materials. The modification of transition metal-based catalysts (rare earth oxide-promoted catalysts, noble-metal bimetallic catalysts, noble-metal-free bimetallic catalysts, and alkaline-earth metal-promoted catalysts) is also discussed. Finally, technical challenges and future perspectives for the development of transition metal-based catalysts in the SCWG of biowaste are presented. This review paper aims at providing an important reference for the design of transition metal-based catalysts with excellent catalytic performance and physicochemical properties and their applications in the SCWG of biowaste. 

Recent advances in supercritical water gasification of biowaste catalyzed by transition metal-based catalysts for hydrogen production

Hydrothermal carbonization of food waste after oil extraction pre-treatment: Study on hydrochar fuel characteristics, combustion behavior, and removal behavior of sodium and potassium.

Cascading disposal for food waste by integration of hydrothermal carbonization and supercritical water gasification

Conversion of kitchen waste effluent to H2-rich syngas via supercritical water gasification: Parameters, process optimization and Ni/Cu steam reforming reaction. Moreover

Hydrothermal carbonization (HTC) can convert food waste into carbon fuel, thus to provide renewable energy. The wastewater, derived from HTC of food waste, contains complex organic pollutants, with a high COD value and low BOD/COD, which is not feasible for direct anaerobic fermentation. This work studied coagulation combined activated carbon (AC) adsorption to reduce the COD in HTC wastewater to promote its biodegradability. The experimental results indicated that poly aluminum ferric sulphate (PAFS) and polyacrylamide (PAM) are the optimal coagulant and coagulant aid, respectively. With the dosage for PAFS, PAM, and AC was 6 g/L, 10 mg/L, 30 g/L, respectively, it can achieve 68.41% of the COD removal ratio, and promote the transmittance of the wastewater from 23% to 89%. Xarthene, carbamide, ferulic acid and inorganic compounds composed of calcium, magnesium, and aluminum plasma from the sediment were detected by X-ray diffraction analysis (XRD), which proved the synergistic effect between coagulation and AC adsorption. The typical pollutants in HTC wastewater were reduced from 19 to 8 kinds after treatment. BOD/COD ratio also increased from 0.30 in wastewater to 0.75 in liquid residual after treatment, improved for subsequent biochemical treatment. Therefore, the coagulation combined adsorption treatment is thought as a promising method in HTC wastewater pretreatment, and a possible prerequisite in the industrial utilization of food waste HTC technology. 

COD removal of wastewater from hydrothermal carbonization of food waste: Using coagulation combined activated carbon adsorption

Development and performance assessment of a novel solar-assisted multigenerational system using high temperature phase change material

Gaojun Zhu

Papers

Hydrothermal carbonization of food waste after oil extraction pre-treatment: Study on hydrochar fuel characteristics, combustion behavior, and removal behavior of sodium and potassium.

Cascading disposal for food waste by integration of hydrothermal carbonization and supercritical water gasification

Conversion of kitchen waste effluent to H2-rich syngas via supercritical water gasification: Parameters, process optimization and Ni/Cu steam reforming reaction. Moreover

COD removal of wastewater from hydrothermal carbonization of food waste: Using coagulation combined activated carbon adsorption

Development and performance assessment of a novel solar-assisted multigenerational system using high temperature phase change material