Abstract
In order to improve the efficiency of anaerobic digestion of long sludge retention time (SRT) sludge and seek a suitable disposal method for the massive plants harvested from constructed wetlands, we prepared Calamus-derived biochar (Calamus-BC) and added it to thermophilic anaerobic digestion (TAD) system of long SRT sludge. Moreover, the effect of Calamus-BC supplemental level (0, 5, 10, 15, 20 g/L) on TAD was explored through a series of batch experiments. Results showed that Calamus-BC addition can increase the conductivity and pH in TAD of long-SRT sludge obviously, thereby promoting methane production, reducing total VFAs accumulation and shortening the lag phases. When the Calamus-BC dosage was 15 g/L, the cumulative CH4 yield reached the highest 246.73 mL/g VS, which was 43.4% higher than the control group. Furthermore, it proved the modified Gompertz model was suitable for the actual evolution of CH4 production in TAD of long-SRT sludge. This study provided an alternative for efficient biomass stabilization and bioenergy recovery from long-SRT sludge and supplied a feasible resourceful approach for massive Calamus from constructed wetlands in water rehabilitation engineering.
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This work was supported by the science and technology innovation demonstration project of social development of Xi’an Science and Technology Bureau (Grant Number: 20SFSF0011) and Key Research and Development Program of Shaanxi Province (2021ZDLSF05-04)
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Wang, Y., Wang, Z., Wang, L. et al. Effects of Calamus-Derived Biochar on the Thermophilic Anaerobic Digestion of Long-SRT Waste Activated Sludge from the Municipal Wastewater Treatment Plant. Waste Biomass Valor 13, 2979–2989 (2022). https://doi.org/10.1007/s12649-022-01693-1
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DOI: https://doi.org/10.1007/s12649-022-01693-1