A novel anaerobic digestion system coupling biogas recirculation with MgCl2 addition for multipurpose sewage sludge treatment

Yuan, Tian; Cheng, Yanfei; Wang, Xuezhi; Yu, Yang; Zhang, Zhen Ya; Lei, Zhongfang; Shimizu, Kazuya; Utsumi, Motoo; Adachi, Yasuhisa; Lee, Dun-Jong

doi:10.1016/j.jclepro.2019.05.124

Cited by 38 publications

(11 citation statements)

References 48 publications

(48 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Liquid residues for AD can be sewage sludge, waste activated sludge (WAS), animal manure or other liquid residual streams. WAS is produced in high quantities in wastewater treatment plants and often further used in AD to utilize the remaining resources [16]. The hydrolysis rate in WAS limits the process.…”

Section: Biodegradable Waste For Anaerobic Digestionmentioning

confidence: 99%

“…Nevertheless, high temperatures also lead to the formation of recalcitrant compounds that can inhibit the methanogenic process [6]. Moreover, high temperatures may improve hydrolysis, but not the SCCA yield in the first stage [16]. Mechanical treatment such as sonification improves the methane yield significantly and has been applied in many full-scale plants [6].…”

Section: Biodegradable Waste For Anaerobic Digestionmentioning

confidence: 99%

“…This biological pretreatment is seen as the most promising method in terms of economy, sustainability and efficiency. Though full-scale plants have been developed, further research is necessary for a successful scale-up of this technology [8,16].…”

Section: Biodegradable Waste For Anaerobic Digestionmentioning

confidence: 99%

See 2 more Smart Citations

Role of Microbial Hydrolysis in Anaerobic Digestion

2020

View full text Add to dashboard Cite

There is a growing need of substrate flexibility for biobased production of energy and value-added products that allows the application of variable biodegradable residues within a circular economy. It can be used to balance fluctuating energy provision of other renewable sources. Hydrolysis presents one of the biggest limitations during anaerobic digestion. Methods to improve it will result in broader process applicability and improved integration into regional material cycles. Recently, one focus of anaerobic digestion research has been directed to systems with a separate hydrolysis–acidogenesis stage as it might be promised to improve process performance. Conditions can be adjusted to each class of microorganisms individually without harming methanogenic microorganisms. Extensive research of separate biomass pretreatment via biological, chemical, physical or mixed methods has been conducted. Nevertheless, several methods lack economic efficiency, have a high environmental impact or focus on specific substrates. Pretreatment via a separate hydrolysis stage as cell-driven biotransformation in a suspension might be an alternative that enables high yields, flexible feeding and production, and a better process control. In this review, we summarize existing technologies for microbial hydrolytic biotransformation in a separate reactor stage and the impacts of substrate, operational parameters, combined methods and process design as well as remaining challenges.

show abstract

Section: Biodegradable Waste For Anaerobic Digestionmentioning

confidence: 99%

Section: Biodegradable Waste For Anaerobic Digestionmentioning

confidence: 99%

See 1 more Smart Citation

Role of Microbial Hydrolysis in Anaerobic Digestion

2020

View full text Add to dashboard Cite

show abstract

“…Latha et al [16] claimed that an optimum intermittent biogas recirculation was more promising as an alternative mixing method for the large-scale AD with low power consumption, as it could enhance biogas yield and improve energy efficiency when compared to the conventional mixing mode of impeller. Moreover, Yuan et al [18], [20] and Zhao et al [21] found that biogas upgrading and sludge conditioning could be simultaneously achieved during the AD of sewage sludge treatment under biogas recirculation coupled with Fe 3+ [18], Mg 2+ [20], or Ca 2+ [21] addition, reflecting its great potentials and profits for cost-saving sewage sludge management. In fact, biogas recirculation has been successfully applied in UASB systems treating various wastewaters, achieving accelerated reactor start-up with the generation of well settleable granular sludge [11], enhanced biomass retention efficiency [22], and promoted formation of microbial granules [23] as well.…”

Section: Introductionmentioning

confidence: 99%

Application of biogas recirculation in anaerobic granular sludge system for multifunctional sewage sludge management with high efficacy energy recovery

et al. 2021

Self Cite

View full text Add to dashboard Cite

This study investigated the possibility of biogas recirculation-driven anaerobic granular sludge system for sewage sludge treatment, aiming to develop an energy sufficient and multifunctional anaerobic digestion (AD) system for sewage sludge with biogas upgrading, sludge stabilization and self-aggregation. Results show that biogas recirculation could enhance the CH4 production rate by 31-44% and shorten the lag-phase duration to 0.08-0.2 day with simultaneous increment of CH4 content (> 83% in this study). The reason is mainly associated with the stronger interspecies electron transfer under the biogas recirculation condition. In addition, 37-40% better dewaterability of the digested sludge was achieved, implying the occurrence of self-aggregation of microbial cells induced by biogas recirculation. Energy balance analysis reflects that this sewage sludge treatment system could enhance the net energy recovery by 78-85%. Moreover, almost no obvious influence was noticed on the seed granules' composition and properties. These findings suggest that the biogas recirculation-driven anaerobic granular sludge system could be a promising alternative for sewage sludge treatment, which can improve biogas quality and sludge dewaterability simultaneously towards sludge self-aggregation with no addition of other chemicals.

show abstract

“…The drag and lift forces generated by rising bubbles can also enhance mixing by increasing circulation within anaerobic digesters, a phenomenon that has been exploited to enhance biogas production by recirculating biogas through digesters [18].…”

Section: Introductionmentioning

confidence: 99%

In Situ Sonification of Anaerobic Digestion: Extended Evaluation of Performance in a Temperate Climate

et al. 2020

View full text Add to dashboard Cite

Increasing the efficiency of anaerobic digesters and improving sludge breakdown is vital to reducing the cost of biogas production and reducing the environmental consequences of sludge disposal. The performance of two unheated anaerobic digestion systems, one exposed to sound at <20 kHz by waterproofed speakers and one acting as a control, were compared for over a year. The digester systems were both composed of primary (11.4 m3) and secondary (3.8 m3) anaerobic tanks, facultative tertiary (3.0 m3) tanks and an aerobic holding tank from which effluent was mixed with feed and recirculated back to the system. Exposure of the gas saturated digestate to a low frequency sine wave induced numerous bubble harmonics up to, and presumably beyond, ultrasonic range, showing that sonification of a highly gaseous liquid might be used to accomplish low power ultrasonication of digestate at greater distances than is possible with conventional ultrasonic technology. Through the summer of 2019, the sound-treated system produced 27% more biogas than the control system, and 74 times more during the winter when biogas production by the control systems essentially ceased. Afterwards, the control system produced more biogas due to depletion of volatile solids in the sound-treated digester. Results show that sound can be used for faster digester startup and substitute for a share of heating requirements during cool months.

show abstract

A novel anaerobic digestion system coupling biogas recirculation with MgCl2 addition for multipurpose sewage sludge treatment

Cited by 38 publications

References 48 publications

Role of Microbial Hydrolysis in Anaerobic Digestion

Role of Microbial Hydrolysis in Anaerobic Digestion

Application of biogas recirculation in anaerobic granular sludge system for multifunctional sewage sludge management with high efficacy energy recovery

In Situ Sonification of Anaerobic Digestion: Extended Evaluation of Performance in a Temperate Climate

Contact Info

Product

Resources

About