Changes in Wastewater Sludge Characteristics Submitted to Thermal Drying, E-beam Irradiation or Anaerobic Digestion

2017 ◽  
Vol 8 (5) ◽  
pp. 1771-1780 ◽  
Author(s):  
L. Lemée ◽  
M. Collard ◽  
N. Karpel Vel Leitner ◽  
B. Teychené
Keyword(s):  
Anaerobic Digestion ◽  
Wastewater Sludge ◽  
Beam Irradiation ◽  
Sludge Characteristics ◽  
Thermal Drying

scholarly journals Anaerobic Co-Digestion of Wastewater Sludge: A Review of Potential Co-Substrates and Operating Factors for Improved Methane Yield

Processes ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 39 ◽  
Author(s):  
Wei Ling Chow ◽  
Siewhui Chong ◽  
Jun Wei Lim ◽  
Yi Jing Chan ◽  
Mei Fong Chong ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Large Scale ◽  
Crude Glycerol ◽  
Waste Treatment ◽  
Agricultural Waste ◽  
Wastewater Sludge ◽  
Methane Yield ◽  
Nutrient Level ◽  
Oil And Grease ◽  
Waste Food

Anaerobic digestion has been widely employed in waste treatment for its ability to capture methane gas released as a product during the digestion. Certain wastes, however, cannot be easily digested due to their low nutrient level insufficient for anaerobic digestion, thus co-digestion is a viable option. Numerous studies have shown that using co-substrates in anaerobic digestion systems improve methane yields as positive synergisms are established in the digestion medium, and the supply of missing nutrients are introduced by the co-substrates. Nevertheless, large-scale implementation of co-digestion technology is limited by inherent process limitations and operational concerns. This review summarizes the results from numerous laboratory, pilot, and full-scale anaerobic co-digestion (ACD) studies of wastewater sludge with the co-substrates of organic fraction of municipal solid waste, food waste, crude glycerol, agricultural waste, and fat, oil and grease. The critical factors that influence the ACD operation are also discussed. The ultimate aim of this review is to identify the best potential co-substrate for wastewater sludge anaerobic co-digestion and provide a recommendation for future reference. By adding co-substrates, a gain ranging from 13 to 176% in the methane yield was accomplished compared to the mono-digestions.

Initial examination of microwave pretreatment on primary, secondary and mixed sludges before and after anaerobic digestion

2008 ◽  
Vol 57 (3) ◽  
pp. 311-317 ◽  
Author(s):  
C. Eskicioglu ◽  
K. J. Kennedy ◽  
R. L. Droste
Keyword(s):  
Anaerobic Digestion ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Waste Activated Sludge ◽  
Initial Examination ◽  
Primary Sludge ◽  
Sludge Characteristics ◽  
Microwave Pretreatment ◽  
Before And After ◽  
Mesophilic Digestion

The effects of microwave pretreatment on disintegration and mesophilic digestion of waste activated sludge (WAS), primary sludge (PS), combined (PS + WAS) sequencing batch reactor (SBR) sludge and anaerobically digested biocake were investigated by both household and bench scale industrial types microwaves at temperatures below and above boiling point. Pretreatment variables, temperature, intensity (cooking rate) and sludge concentration had statistically significant effects on solubilization. The microwave pretreatment also increased the bioavailability of sludge components under batch anaerobic digestion and enhanced the dewaterability of pretreated sludges after digestion. However, the level of improvements in solubilization and biodegradation from different waste sludges were different. While the largest improvement in ultimate biodegradation was observed in WAS, microwave irradiation only affected the rate of biodegradation of pretreated PS samples. Similarly, relatively lower solubilization ratios achieved for combined - SBR sludge was attributed to high sludge age of extended aeration SBR unit. It is possible that initial sludge characteristics may influence final pretreatment outcomes so that general statements of performance cannot always be made.

Sludge electrooxidation as pre-treatment for anaerobic digestion

2016 ◽  
Vol 75 (4) ◽  
pp. 775-781 ◽  
Author(s):  
J. A. Barrios ◽  
U. Duran ◽  
A. Cano ◽  
M. Cisneros-Ortiz ◽  
S. Hernández
Keyword(s):  
Anaerobic Digestion ◽  
Volatile Fatty Acids ◽  
Biogas Production ◽  
Oxygen Demand ◽  
Wastewater Sludge ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Treatment Conditions ◽  
Volatile Solids ◽  
Pre Treatment

Anaerobic digestion of wastewater sludge is the preferred method for sludge treatment as it produces energy in the form of biogas as well as a stabilised product that may be land applied. Different pre-treatments have been proposed to solubilise organic matter and increase biogas production. Sludge electrooxidation with boron-doped diamond electrodes was used as pre-treatment for waste activated sludge (WAS) and its effect on physicochemical properties and biomethane potential (BMP) was evaluated. WAS with 2 and 3% total solids (TS) achieved 2.1 and 2.8% solubilisation, respectively, with higher solids requiring more energy. After pre-treatment, biodegradable chemical oxygen demand values were close to the maximum theoretical BMP, which makes sludge suitable for energy production. Anaerobic digestion reduced volatile solids (VS) by more than 30% in pre-treated sludge with a food to microorganism ratio of 0.15 g VSfed g−1 VSbiomass. Volatile fatty acids were lower than those for sludge without pre-treatment. Best pre-treatment conditions were 3% TS and 28.6 mA cm−2.

Methanogenic Performance of Pulp and Paper Mill Sludge Using Anaerobic Digestion Process

2014 ◽  
Vol 675-677 ◽  
pp. 680-684
Author(s):  
Zhao Mei Du ◽  
Qin Wu ◽  
Xiao Qin Zhang
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Production ◽  
Paper Mill ◽  
Pulp And Paper ◽  
Wastewater Sludge ◽  
Pulp And Paper Mill ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Feeding Modes ◽  
Paper Mill Wastewater

The feasibility of pulp and paper mill wastewater sludge as substrates for biogas production was evaluated in labrotory scale. Also the influence of pre-acidification, feeding modes and sludge concentration on anaerobic digestion system were studied.

Toxicity of di-(2-ethylhexyl) phthalate on the anaerobic digestion of wastewater sludge

2003 ◽  
Vol 37 (6) ◽  
pp. 1260-1269 ◽  
Author(s):  
F Alatriste-Mondragon ◽  
R Iranpour ◽  
B.K Ahring
Keyword(s):  
Anaerobic Digestion ◽  
Wastewater Sludge ◽  
Ethylhexyl Phthalate

Efficiency of autothermal thermophilic aerobic digestion and thermophilic anaerobic digestion of municipal wastewater sludge in removing Salmonella spp. and indicator bacteria

2003 ◽  
Vol 47 (3) ◽  
pp. 151-156 ◽  
Author(s):  
J. Zábranská ◽  
M. Dohányos ◽  
P. Jeníček ◽  
H. Ružičková ◽  
A. Vránová
Keyword(s):  
Anaerobic Digestion ◽  
Municipal Wastewater ◽  
Agricultural Land ◽  
Land Application ◽  
Wastewater Sludge ◽  
Indicator Bacteria ◽  
Salmonella Spp ◽  
Aerobic Digestion ◽  
Thermophilic Aerobic Digestion ◽  
Autothermal Thermophilic Aerobic Digestion

The study is focused on the comparison of autothermal thermophilic aerobic digestion, thermophilic and mesophilic anaerobic digestion, based on long term monitoring of all processes in full-scale wastewater treatment plants, with an emphasis on the efficiency in destroying pathogens. The hygienisation effect was evaluated as a removal of counts of indicator bacteria, thermotolerant coliforms and enterococci as CFU/g total sludge solids and a frequency of a positive Salmonella spp. detection. Both thermophilic technologies of municipal wastewater sludge stabilisation had the capability of producing sludge A biosolids suitable for agricultural land application when all operational parameters (mainly temperature, mixing and retention time) were stable and maintained at an appropriate level.

Sign in / Sign up

Export Citation Format

Share Document