Enhancing short-term ethanol-type fermentation of waste activated sludge by adding saccharomycetes and the implications for bioenergy and resource recovery

2022 ◽  
Vol 113 ◽  
pp. 179-189
Author(s):  
Linke Zheng ◽  
Ying Xu ◽  
Hui Geng ◽  
Xiaohu Dai
Keyword(s):  
Activated Sludge ◽  
Resource Recovery ◽  
Waste Activated Sludge ◽  
Short Term

Waste activated sludge lysate treatment: resource recovery and refractory organics degradation

2021 ◽  
pp. 126206
Author(s):  
Hui Wang ◽  
Wenzong Liu ◽  
Muhammad Rizwan Haider ◽  
Feng Ju ◽  
Zhe Yu ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Resource Recovery ◽  
Waste Activated Sludge ◽  
Refractory Organics

Long and short term impacts of CuO, Ag and CeO2nanoparticles on anaerobic digestion of municipal waste activated sludge

2016 ◽  
Vol 18 (2) ◽  
pp. 277-288 ◽  
Author(s):  
E. Kökdemir Ünşar ◽  
A. S. Çığgın ◽  
A. Erdem ◽  
N. A. Perendeci
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Municipal Waste ◽  
Waste Activated Sludge ◽  
Short Term

In this study, long and short term inhibition impacts of Ag, CuO and CeO2nanoparticles (NPs) on anaerobic digestion (AD) of waste activated sludge (WAS) were investigated.

scholarly journals Potential of waste activated sludge to accumulate polyhydroxyalkanoates and glycogen using industrial wastewater/liquid wastes as substrates

2019 ◽  
Vol 80 (12) ◽  
pp. 2373-2380
Author(s):  
Michihiko Ike ◽  
Yukihiro Okada ◽  
Takaaki Narui ◽  
Kosuke Sakai ◽  
Masashi Kuroda ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Industrial Wastewater ◽  
Value Added ◽  
Waste Activated Sludge ◽  
Organic Substrates ◽  
Short Term ◽  
Industrial Wastewaters ◽  
Combined Use ◽  
Liquid Wastes ◽  
Practical Implications

Abstract Recovery of the organics in industrial wastewaters/liquid wastes as polyhydroxyalkanoate (PHA) and/or glycogen (GLG) in waste activated sludge is a useful strategy to not only improve the resource value of waste activated sludge but also reduce the energy and cost of waste disposal and wastewater treatment. This study aimed to evaluate the potential of activated sludge to accumulate PHA and GLG using complex substrates (actual and simulated industrial wastewaters/liquid wastes) in addition to various simple organic substrates (organic acids, saccharides, and glycerol). The 24 h PHA and GLG accumulation experiments resulted in the accumulation of up to 25.5%, 6.0% and 14.1% of polyhydroxybutyrate (PHB), polyhydroxyvalerate (PHV) and GLG, respectively, from simple substrates, and up to 9.8%, 0.1% and 14.6%, respectively, from complex substrates. The results indicated that activated sludge can accumulate PHA and GLG even from complex wastewater substrates, although the accumulated PHA and GLG levels were not sufficiently high. The results also indicated that the PHA and GLG accumulation abilities of activated sludge from complex substrates can be drastically enhanced by a short-term acclimation to the corresponding substrate. This study will present the practical implications for value-added resource production through the combined use of waste activated sludge and industrial wastewaters.

A pilot study of anaerobic membrane digesters for concurrent thickening and digestion of waste activated sludge (WAS)

2010 ◽  
Vol 61 (6) ◽  
pp. 1451-1458 ◽  
Author(s):  
Martha Dagnew ◽  
Wayne J. Parker ◽  
Peter Seto
Keyword(s):  
Activated Sludge ◽  
Retention Time ◽  
Substantial Reduction ◽  
Biomass Energy ◽  
Supernatant Fraction ◽  
Waste Activated Sludge ◽  
Short Term ◽  
Solids Concentration ◽  
Volatile Solids ◽  
Anaerobic Membrane Bioreactors

The increased interest in biomass energy provides incentive for the development of efficient and high throughput digesters such as anaerobic membrane bioreactors (AnMBRs) to stabilize waste activated sludge (WAS). This paper presents the results of a pilot and short term filtration study that was conducted to assess the performance of AnMBRs when treating WAS at a 15 day hydraulic retention time (HRT) and 30 day sludge retention time (SRT) in comparison to two conventional digesters running at 15 (BSR-15) and 30 days (BSR-30) HRT/SRT. At steady state, the AnMBR digester showed a slightly higher volatile solids (VS) destruction of 48% in comparison to 44% and 35.3% for BSR-30 and BSR-15, respectively. The corresponding values of specific methane production were 0.32, 0.28 and 0.21 m3 CH4/kg of VS fed. Stable membrane operation at an average flux of 40 ± 3.6 LM−2 H−1 (LMH) was observed when the digester was fed with a polymer-dosed thickened waste activated sludge (TWAS) and digester total suspended solids (TSS) concentrations were less than 15 gL−1. Above this solids concentration a flux decline to 24.1 ± 2.0 LM−2 H−1 was observed. Short term filtration tests conducted using sludge fractions of a 9.7 and 17.1 gL−1 TSS sludge indicated 84 and 70% decline in filtration performance to be associated with the supernatant fraction of the sludge. At a higher sludge concentration, the introduction of unique fouling control strategy to tubular membranes, a relaxed mode of operation (i.e. 5 minutes permeation and 1 minute relaxation by) significantly increased the flux from 23.8 ± 1.1 to 37.8 ± 2.3 LMH for a neutral membrane and from 25.7 ± 1.1 to 44.9 ± 2.9 LMH for a negatively charged membrane. The study clearly indicates that it is technically feasible to employ AnMBRs to achieve a substantial reduction in digester volumes.

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