Hydrothermal treatment enhances energy recovery from pig manure digestate and improves the properties of residues

Energy recovery from biowaste is of high significance for a sustainable society. Herein, hydrothermal treatment (HT) was applied to valorize pig manure digestate. The effects of hydrothermal operational parameters, including temperature (130-250 °C), residence time (15-90 min), and total solid (TS)...

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Published in:Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering Toxic/hazardous substances & environmental engineering, 2023, Vol.58 (2), p.116-126
Main Authors: Liao, Dachen, Sun, Ke, Liu, Chenyang, Ye, Qiang, Luo, Hailong, Sun, Haipeng, Lu, Qi, Yang, Yili, He, Ruo
Format: Article
Language:English
Subjects:
Anaerobic digestion
Anaerobiosis
Animals
Antibiotics
Biofuels
Bioreactors
digestate
Doxycycline
Energy recovery
Environmental risk
Hydrolysates
Hydrothermal treatment
Hygiene
Livestock
Manure
Manures
Methane
Oxytetracycline
Pig manure
Poultry manure
Sugar
Sugars
Sulfamonomethoxine
Swine
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Summary:Energy recovery from biowaste is of high significance for a sustainable society. Herein, hydrothermal treatment (HT) was applied to valorize pig manure digestate. The effects of hydrothermal operational parameters, including temperature (130-250 °C), residence time (15-90 min), and total solid (TS) concentration (10%-20%), on reducing sugar yield were investigated in this study. Among them, hydrothermal temperature was identified as the most important factor influencing reducing sugar yield, followed by the TS concentration and time. The optimal hydrothermal conditions for the pig manure digestate were 175.6 °C, 35.4 min and a TS concentration of 10% with a reduced sugar yield of 9.81 mg gTS −1 . The addition of hydrolysate could enhance methane production by 21.6-50.4% from the anaerobic digestion of pig manure than that without the hydrolysate addition. After HT, the hygienic quality, including fecal coliform number and ascaris egg mortality, was improved in the residual digestate. Antibiotics such as sulfamonomethoxine, oxytetracycline, doxycycline and sulfaclodazine in the pig manure digestate were decomposed during HT and decreased environmental risk. These findings indicated that the hydrothermal process might be an effective technique to recover energy from the digestate of livestock and poultry manure and to improve the residual digestate for subsequent utilization.
ISSN:1093-4529
1532-4117
DOI:10.1080/10934529.2023.2176092