scholarly journals Temperature Phased Anaerobic Digestion at the Intermediate Zone of 45 °C: Performances, Stability and Pathogen Deactivation

2021 ◽  
Vol 50 (7) ◽  
pp. 1827-1841
Author(s):  
Nuruol Syuhadaa Mohd ◽  
Baoqiang Li ◽  
Shaliza Ibrahim ◽  
Rumana Riffat
Keyword(s):  
Anaerobic Digestion ◽  
Intermediate Zone ◽  
Second Stage ◽  
Class A ◽  
Volatile Solids ◽  
Solids Retention ◽  
High Alkalinity ◽  
Acetate Accumulation ◽  
Better Than ◽  
Class A Biosolids

Temperature phased anaerobic digestion (TPAD) systems with conventional sequences (first stage of 55 ℃ and second stage of 35 ℃) have been widely studied. However, very limited studies were available on TPAD system with the first stage operated at the intermediate zone of 45 °C, mainly due to the notion that limited microbial activity occurs within this zone. The objective of this research was to evaluate the performance, stability and the capability of 45 °C TPAD in producing class A biosolids, in comparison to a conventional TPAD. Four combinations of TPAD systems were studied, 45 ℃ TPAD 2.5/10 (1st stage solids retention time (SRT) 2.5 days/2nd stage SRT 10 days), 45 ℃ TPAD 7.5/10, 55 ℃ TPAD 2.5/10 and 55 ℃ TPAD 7.5/10. Among all, 45 ℃ TPAD 7.5/10 was found to have the best performances, attributed to its high volatile solids (VS) destruction (58%), minimal acetate accumulation (127 mg/L), high methane yield (0.58 m3 CH4/kg VS removed), high COD destruction solid COD (sCOD; 74% and total COD (tCOD) 54%) and minimal free NH3 content (67.5 mg/L). As for stability, stable pH distribution, high alkalinity content and low VFA to alkalinity ratio, indicated a well-buffered system. Additionally, the system had also able to produce class A biosolids. Therefore, proved that TPAD system operated at the intermediate zone of 45 ℃ can perform better than the conventional TPAD, hence, highlighting its economic advantage.

Thermophilic-Anaerobic Digestion to Produce Class A Biosolids: Initial Full-Scale Studies at Hyperion Treatment Plant

2006 ◽  
Vol 78 (2) ◽  
pp. 170-180 ◽  
Author(s):  
R. Iranpour ◽  
H.H.J. Cox ◽  
S. Oh ◽  
S. Fan ◽  
R.J. Kearney ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Treatment Plant ◽  
Full Scale ◽  
Class A ◽  
Thermophilic Anaerobic Digestion ◽  
Class A Biosolids

TWO-PHASE ANAEROBIC DIGESTION FOR CLASS A BIOSOLIDS AT MOCCASIN BEND WWTP

2006 ◽  
Vol 2006 (2) ◽  
pp. 705-715
Author(s):  
David Bible ◽  
Bob Borneman ◽  
Alice Cannella
Keyword(s):  
Anaerobic Digestion ◽  
Two Phase ◽  
Class A ◽  
Class A Biosolids

Evaluation of anaerobic digestion processes for short sludge-age waste activated sludge combined with anammox treatment of digestate liquor

2015 ◽  
Vol 73 (5) ◽  
pp. 1052-1060 ◽  
Author(s):  
Huoqing Ge ◽  
Damien Batstone ◽  
Jurg Keller
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Removal Rate ◽  
Ammonia Solution ◽  
High Rate ◽  
Meat Processing ◽  
Sludge Digestion ◽  
Volatile Solids ◽  
Anammox Activity ◽  
Solids Retention

The need to reduce energy input and enhance energy recovery from wastewater is driving renewed interest in high-rate activated sludge treatment (i.e. short hydraulic and solids retention times (HRT and SRT, respectively)). This process generates short SRT activated sludge stream, which should be highly degradable. However, the evaluation of anaerobic digestion of short SRT sludge has been limited. This paper assesses anaerobic digestion of short SRT sludge digestion derived from meat processing wastewater under thermophilic and mesophilic conditions. The thermophilic digestion system (55°C) achieved 60 and 68% volatile solids destruction at 8 day and 10 day HRT, respectively, compared with 50% in the mesophilic digestion system (35°C, 10 day HRT). The digestion effluents from the thermophilic (8–10 day HRT) and mesophilic systems were stable, as assessed by residual methane potentials. The ammonia rich sludge dewatering liquor was effectively treated by a batch anammox process, which exhibited comparable nitrogen removal rate as the tests using a control synthetic ammonia solution, indicating that the dewatering liquor did not have inhibiting/toxic effects on the anammox activity.

TECHNICAL CONSIDERATIONS AND PROCESS ALTERNATIVES FOR PRODUCTION OF CLASS A BIOSOLIDS BY ANAEROBIC DIGESTION

2001 ◽  
Vol 2001 (1) ◽  
pp. 34-43
Author(s):  
T. Sadick ◽  
S. Murthy ◽  
E. Kasirga ◽  
R. L. Walden ◽  
T. G. Shea ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Class A ◽  
Technical Considerations ◽  
Class A Biosolids

2 – Phase Anaerobic Digestion to Achieve Class A Biosolids

2006 ◽  
Vol 2006 (2) ◽  
pp. 880-892
Author(s):  
H.J. “Jay” Curtis ◽  
Michael R. Leffler
Keyword(s):  
Anaerobic Digestion ◽  
Class A ◽  
Class A Biosolids

PRE–PASTEURISATION AND ANAEROBIC DIGESTION A Low Cost Route to Class A Biosolids

2000 ◽  
Vol 2000 (9) ◽  
pp. 523-543
Author(s):  
Colin Brade ◽  
Dorian Harrison ◽  
Aidan Cumiskey ◽  
Mick Dawson
Keyword(s):  
Anaerobic Digestion ◽  
Low Cost ◽  
Class A ◽  
Class A Biosolids

scholarly journals Effects of Lipase Addition, Hydrothermal Processing, Their Combination, and Co-Digestion with Crude Glycerol on Food Waste Anaerobic Digestion

Fermentation ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 284
Author(s):  
Xiaojue Li ◽  
Naoto Shimizu
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Methane Production ◽  
Crude Glycerol ◽  
Anaerobic Fermentation ◽  
Gompertz Model ◽  
Volatile Solids ◽  
Methane Potential ◽  
Better Than ◽  
Modified Gompertz Model

To enhance anaerobic fermentation during food waste (FW) digestion, pretreatments can be applied or the FW can be co-digested with other waste. In this study, lipase addition (LA), hydrothermal pretreatment (HTP), and a combination of both methods (HL) were applied to hydrolyze organic matter in FW. Furthermore, the effects of crude glycerol (CG), which provided 5%, 10%, and 15% of the volatile solids (VS) as co-substrate (denoted as CG5, CG10, and CG15, respectively), on the anaerobic digestion of FW were assessed. With an increasing proportion of CG in the co-digestion experiment, CG10 showed higher methane production, while CG15 negatively affected the anaerobic digestion (AD) performance owing to propionic acid accumulation acidifying the reactors and inhibiting methanogen growth. As the pretreatments partially decomposed hard-to-degrade substances in advance, pretreated FW showed a stronger methane production ability compared with raw FW, especially using the HL method, which was significantly better than co-digestion. HL pretreatment was shown to be a promising option for enhancing the methane potential value (1.773 NL CH4/g VS) according to the modified Gompertz model.

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