Wastewater Energy Recovery Using Bioelectrochemical Systems and Anaerobic Digestion

2016 ◽  
Vol 2016 (11) ◽  
pp. 459-465
Author(s):  
Jeff Beegle ◽  
Abhijeet Borole
Keyword(s):  
Anaerobic Digestion ◽  
Energy Recovery ◽  
Bioelectrochemical Systems

pH regulation of the first phase could enhance the energy recovery from two‐phase anaerobic digestion of food waste

2021 ◽  
Author(s):  
Qing Zhao ◽  
Samuel Gyebi Arhin ◽  
Ziyi Yang ◽  
Haopeng Liu ◽  
Zongye Li ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Energy Recovery ◽  
Ph Regulation ◽  
Two Phase

scholarly journals Efficiency of integrated electrooxidation and anaerobic digestion of waste activated sludge

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
J. A. Barrios ◽  
A. Cano ◽  
F. F. Rivera ◽  
M. E. Cisneros ◽  
U. Durán
Keyword(s):  
Anaerobic Digestion ◽  
Current Density ◽  
Methane Production ◽  
Energy Recovery ◽  
Energy Analysis ◽  
Mathematical Optimization ◽  
Waste Activated Sludge ◽  
Bdd Electrode ◽  
Vs Removal ◽  
Pre Treatment

Abstract Background Most of the organic content of waste activated sludge (WAS) comprises microbial cells hard to degrade, which must be pre-treated for energy recovery by anaerobic digestion (AD). Electrooxidation pre-treatment (EOP) with boron-doped diamond (BDD) electrode have been considered a promising novel technology that increase hydrolysis rate, by the disintegrating cell walls from WAS. Although electrochemical oxidation could efficiently solubilize organic substances of macromolecules, limited reports are available on EOP of WAS for improving AD. In this endeavour, the mathematical optimization study and the energy analysis of the effects of initial total solids concentrations [TS] of WAS and current density (CD) during EOP on the methane production and removal of chemical oxygen demand (COD) and volatile solids (VS) were investigated. Because limited reports are available on EOP of WAS for improving biogas production, it is not well understood; however, it has started to attract interest of scientists and engineers. Results In the present work, the energy recovery as biogas and WAS conversion were comprehensively affected by CD and [TS], in an integrated EOP and AD system. When working with WAS at 3% of [TS] pre-treated at current density of 24.1 mA/cm2, the highest COD and VS removal were achieved, making it possible to obtain the maximum methane (CH4) production of 305 N-L/kg VS and a positive energy balance of 1.67 kWh/kg VS. Therefore, the current densities used in BDD electrode are adequate to produce the strong oxidant (hydroxyl radical, ·OH) on the electrode surface, allow the oxidation of organic compounds that favours the solubilization of particulate matter and VS from WAS. Conclusions The improvement of VS removal and COD solubilization were due to the effects of pre-treatments, which help to break down the microbial cells for faster subsequent degradation; this allows a decomposition reaction that leads to biodegrade more compounds during AD. The balance was positive, suggesting that even without any optimization the energy used as electricity could be recovered from the increased methane production. It is worth noting that this kind of analysis have not been sufficiently studied so far. It is therefore important to understand how operational parameters can influence the pre-treatment and AD performances. The current study highlights that the mathematical optimization and energy analysis can make the whole process more convenient and feasible.

scholarly journals Recent Approaches for the Production of High Value-Added Biofuels from Gelatinous Wastewater

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4936
Author(s):  
Ahmed Tawfik ◽  
Shou-Qing Ni ◽  
Hanem. M. Awad ◽  
Sherif Ismail ◽  
Vinay Kumar Tyagi ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Energy Recovery ◽  
Protein Concentration ◽  
Volatile Fatty Acids ◽  
Low Cost ◽  
Large Fraction ◽  
Value Added ◽  
Organic Loading Rate ◽  
Simultaneous Treatment ◽  
Factors Affecting

Gelatin production is the most industry polluting process where huge amounts of raw organic materials and chemicals (HCl, NaOH, Ca2+) are utilized in the manufacturing accompanied by voluminous quantities of end-pipe effluent. The gelatinous wastewater (GWW) contains a large fraction of protein and lipids with biodegradability (BOD/COD ratio) exceeding 0.6. Thus, it represents a promising low-cost substrate for the generation of biofuels, i.e., H2 and CH4, by the anaerobic digestion process. This review comprehensively describes the anaerobic technologies employed for simultaneous treatment and energy recovery from GWW. The emphasis was afforded on factors affecting the biofuels productivity from anaerobic digestion of GWW, i.e., protein concentration, organic loading rate (OLR), hydraulic retention time (HRT), the substrate to inoculum (S0/X0) ratio, type of mixed culture anaerobes, carbohydrates concentration, volatile fatty acids (VFAs), ammonia and alkalinity/VFA ratio, and reactor configurations. Economic values and future perspectives that require more attention are also outlined to facilitate further advancement and achieve practicality in this domain.

Mechanical pre-treatment of source-collected municipal biowaste prior to energy recovery by anaerobic digestion

Chemosphere ◽  
2021 ◽  
pp. 133376
Author(s):  
Mariana Moreira de Oliveira ◽  
Paul Moretti ◽  
Carina Malinowsky ◽  
Rémy Bayard ◽  
Pièrre Buffière ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Energy Recovery ◽  
Pre Treatment

Application of bioelectrochemical systems to regulate and accelerate the anaerobic digestion processes

Chemosphere ◽  
2022 ◽  
Vol 287 ◽  
pp. 132299
Author(s):  
C. Nagendranatha Reddy ◽  
Sanath Kondaveeti ◽  
Gunda Mohanakrishna ◽  
Booki Min
Keyword(s):  
Anaerobic Digestion ◽  
Bioelectrochemical Systems

Evaluation of bioelectrochemical systems for wastewater treatment and sludge digestion

2014 ◽  
Author(s):  
◽  
Shashikanth Gajaraj
Keyword(s):  
Wastewater Treatment ◽  
Anaerobic Digestion ◽  
Membrane Fouling ◽  
Microbial Fuel Cells ◽  
Microbial Consortia ◽  
Electrolysis Cell ◽  
Bioelectrochemical Systems ◽  
Wastewater Remediation ◽  
Sludge Digestion ◽  
Removal Efficiencies

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] Much attention has been drawn by bioelectrochemical systems (BES) in the past years for wastewater treatment, due to its potential for enhanced wastewater treatment and resource recovery with added advantages in terms of energy generation, environmental footprint, operating stability and economics. This dissertation focuses on the potential to improve treatment efficiency of different wastewater components when assisted by BES. Modified Ludzack-Ettinger (MLE) process and membrane bioreactor (MBR) process assisted by microbial fuel cells (MFC) showed improved the nitrate-nitrogen removal efficiencies by upto 31% and 20% respectively, and reduced sludge produced by 11% and 6% respectively over the control reactors. While the unique design of the cathode significantly reduced physical membrane fouling, all other bioreactor performance was unaffected. Microbial electrolysis cell (MEC) assisted Cr[VI] reduction was faster in 60 days as compared to 69 days with MFC assisted systems and 85 days with the control. The total Cr removal efficiencies in the control system and the MFC or MEC-assisted systems were 20%, 55%, and 65%, respectively, demonstrating the ability of BES in assisting wastewater remediation process. Finally, MECs incorporated into anaerobic digestion resulted in increased production of methane of 9.4 % or 8.5% with both glucose and activated sludge respectively as the substrate. The integration of MEC had no impact on acetoclastic methanogens involved in anaerobic digestion, but significantly increased the populations of hydrogenotrophic methanogens, especially Methanobacteriales. In conclusion, the integration of BES with conventional wastewater treatment and sludge digestion process enhanced the removal of organic matter, nitrate and toxic metals while supporting healthy microbial consortia.

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