Impacts of feed dilution and lower solids retention time on performance of thermal hydrolysis/anaerobic digestion

2019 ◽  
Vol 91 (5) ◽  
pp. 386-398 ◽  
Author(s):  
Matthew J. Higgins ◽  
Steven Beightol ◽  
Christine DeBarbidillo ◽  
Haydee De Clippeleir ◽  
Bipin Pathak ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Retention Time ◽  
Thermal Hydrolysis ◽  
Solids Retention Time ◽  
Solids Retention

Understanding the formation of recalcitrant dissolved organic nitrogen as a result of thermal hydrolysis and anaerobic digestion of municipal sludge

2021 ◽  
Vol 7 (2) ◽  
pp. 335-345
Author(s):  
Dian Zhang ◽  
Zhaohui An ◽  
Mary Strawn ◽  
Tom Broderick ◽  
Wendell Khunjar ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Retention Time ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Thermal Hydrolysis ◽  
Municipal Sludge ◽  
Solids Retention Time ◽  
Solids Retention ◽  
Different Temperatures ◽  
First Time

This study for the first time investigated the turnover of dissolved organic nitrogen in lab-scale thermal hydrolysis pretreatment at different temperatures with and without mesophilic anaerobic digestion at a solids retention time of 15 days.

Effects of solids retention time on methanogenesis in anaerobic digestion of thickened mixed sludge

2011 ◽  
Vol 102 (22) ◽  
pp. 10266-10272 ◽  
Author(s):  
Il-Su Lee ◽  
Prathap Parameswaran ◽  
Bruce E. Rittmann
Keyword(s):  
Anaerobic Digestion ◽  
Retention Time ◽  
Solids Retention Time ◽  
Solids Retention

scholarly journals Impacts of Temperature and Solids Retention Time, and Possible Mechanisms of Biological Hydrolysis Pretreatment on Anaerobic Digestion

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3166
Author(s):  
Huihuang H. Ding ◽  
Polina Kotova ◽  
Christopher Shaw ◽  
Youngseck Hong ◽  
Sheng Chang
Keyword(s):  
Anaerobic Digestion ◽  
Retention Time ◽  
Wastewater Treatment Plants ◽  
Scale Up ◽  
Pilot Scale ◽  
Methane Yield ◽  
Continuous Stirred Tank Reactor ◽  
Volatile Solids ◽  
Solids Retention Time ◽  
Solids Retention

Anaerobic digestion (AD) has benefits in sludge management, energy recovery, and pathogen reduction. In order to better understand the mechanisms of biological hydrolysis (BH) pretreatment on AD, biochemical methane potential (BMP) and continuous stirred-tank reactor (CSTR) tests were utilized to compare untreated municipal combined sludge with pilot-scale BH pretreated sludge. During the BH process, there was 15%, 30%, and 33% (w/w) volatile solids (VS) reduction after BH at 42 °C (BH42) for 24, 48, and 72 h, respectively; under BH61 (42 °C for 36 h and 61 °C for 6 h), and there was 10% and 30% (w/w) overall VS reduction after 36-h and 42-h hydrolysis, respectively. BMP results showed that BH42-pretreated sludge had 22.6% enhancement of methane yield compared to untreated sludge, and BH61 pretreated sludge had 29.4% enhancement of methane yield. Both temperature and solids’ retention time (SRT) contributed to the enhanced AD performance within 36 h, while temperature played more important roles after 36-h BH pretreatment. CSTR tests confirmed the acceleration of anaerobic digestion by BH pretreatment, and higher enhancement was observed when SRT of anaerobic digestion was shorter than 16 days. Through a literature review of BH-related studies, the possible mechanisms were highlighted for further optimization on the scale-up systems in order to reduce carbon footprint and operating expenditure for wastewater treatment plants.

Impact of solids retention time on dissolved organic nitrogen and its biodegradability in treated wastewater

2016 ◽  
Vol 92 ◽  
pp. 44-51 ◽  
Author(s):  
Halis Simsek ◽  
Murthy Kasi ◽  
Jae-Bom Ohm ◽  
Sudhir Murthy ◽  
Eakalak Khan
Keyword(s):  
Retention Time ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Treated Wastewater ◽  
Solids Retention Time ◽  
Solids Retention

Nitrogen removal in activated sludge systems including denitrification in secondary clarifiers

1994 ◽  
Vol 30 (6) ◽  
pp. 101-111 ◽  
Author(s):  
H. Siegrist ◽  
W. Gujer
Keyword(s):  
Activated Sludge ◽  
Nitrogen Removal ◽  
Retention Time ◽  
Secondary Clarifier ◽  
Solids Retention Time ◽  
Solids Retention ◽  
Activated Sludge Systems

Denitrification in the secondary clarifier can contribute substantially to the nitrogen removal of activated sludge systems. This is illustrated on two treatment plants with different secondary clarifier systems. A model to estimate denitrification capacity and to design activated sludge systems for nitrogen removal is developed and verified with data from two treatment plants. The model includes denitrification in the secondary clarifier, wastewater composition (soluble readily biodegradable COD, particulate degradable COD), oxygen input into the anoxic volume, temperature, and solids retention time (SRT). The influence of aerated grit chambers and primary sedimentation on denitrification is discussed.

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