Impacts of different biochar types on the anaerobic digestion of sewage sludge

Abstract

Pyrolysis temperature and feedstock types had a pronounced effect on biochar properties, and biochar could facilitate the anaerobic digestion process.

Addition of Different Biochars as Catalysts during the Mesophilic Anaerobic Digestion of Mixed Wastewater Sludge

“…From 2015, numerous studies [13,[20][21][22][23][24][25][26][27][28][29][30] have investigated BC supplementation to enhance methane production during the AD of wastewater sludge, sometimes with controversial results. In most studies, the addition of BCs improved methane yields and production rates to different extents, due to mechanisms such as biomass immobilization, enhanced interspecies electron transfer, mitigation of ammonia inhibition, increased AD buffering capacity, and carbon dioxide sequestration [17].…”

“…In most studies, the addition of BCs improved methane yields and production rates to different extents, due to mechanisms such as biomass immobilization, enhanced interspecies electron transfer, mitigation of ammonia inhibition, increased AD buffering capacity, and carbon dioxide sequestration [17]. However, additional inhibitory effects on AD were observed in the case of excessive doses of BCs [21,23,24,27,30]. The variability of these results may derive from the extensive variation in BC physic-chemical properties.…”

“…On the other hand, activated and modified BCs [21,31] may be produced from a broad variety of feedstocks and as a result of different physical or chemical treatments. Any comparison of the cited studies can be difficult due to the wide variability of AD testing conditions, and only a few studies [24,30,31] have analyzed the effect of BCs having different physic-chemical properties under the same AD operating conditions. To our knowledge, a critical analysis of the role of BC as an additive towards the AD of MS, with direct comparison of the physic-chemical features of different BC materials under the same experimental conditions, is still missing in the literature.…”

Advanced bioH2 and bioCH4 production with cobalt-doped magnetic carbon

“…49 Moreover, DIET is faster than IET through H 2 for CH 4 formation. 49 Zhang et al 50 concluded that BC supplementation in anaerobic digestion improved the growth of Methanosarcina compared with H 2 -consuming bacteria (eqn (5)), being in accordance with the higher CH 4 yields in BC-amended bioreactors in comparison to other bioreactors without BC. Gustavsson et al 13 conrmed that Ni or Co was a key element for maintaining bioCH 4 generation process stability and boosted the substrate utilization level.…”

Improving sulfonamide antibiotics removal from swine wastewater by supplying a new pomelo peel derived biochar in an anaerobic membrane bioreactor

“…Nevertheless, when the balance between different functional groups recovered, the reactor's performance also recovered as shown by a decrease in effluent COD and much better COD removal efficiency. Some previous reports have indicated that biochar supplementation could enhance the performance of anaerobic digestion processes in terms of methane production (Wang et al, 2020;Zhang et al, 2019). Specifically, Wang et al (2020) concluded that biochar addition could enhance the methane production rate, and its final yield by increasing buffering capacity and the diversity of methanogens of the anaerobic process.…”