Destroying lignocellulosic matters for enhancing methane production from excess sludge

The main purpose of this study was the assessment of the possibility of increasing the production of biogas through the pre-treatment of thickened excess sludge (TES) by means of the hydrodynamic cavitation (HC) conducted at different levels of energy density (EL) i.e., 70, 140 and 210 kJ/L. The experiments were performed on a pilot scale, and a mixture of thickened primary sludge (TPS) and TES was used as digester feed. The results documented that an important parameter determining the possibility of obtaining an enhanced methane production is the value of energy input in the HC process. This parameter determines the changes occurring in sludge as a result of disintegration (i.e., sludge floc deagglomeration, lysis of cells, re-flocculation process and the related release of compounds susceptible to biodegradation from sludge flocs). The maximum increase in methane yield (MY) of 152% was obtained for EL = 140 kJ/L. In this case, HC mainly caused sludge floc deagglomeration. An increase in MY was also recorded when TES was subject to the disintegration process at EL = 210 kJ/L. However, it was 4.3 times lower than that observed for EL = 140 kJ/L. Pre-treatment of TES at EL = 70 kJ/L did not contribute to an increase in methane production.

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Effect of Ultrasonication on Excess Sludge Bioavailability for Methane Production

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN ◽

10.1252/jcej.08we129 ◽

2009 ◽

Vol 42 (Supplement.) ◽

pp. s67-s72 ◽

Cited By ~ 1

Author(s):

Jun-ichi Sotodate ◽

Kanae Inaba ◽

Hideo Tajima ◽

Kazuaki Yamagiwa

Keyword(s):

Methane Production ◽

Excess Sludge

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CO-DIGESTION OF GREASY WASTE AND MBR SLUDGE USING BIO-AUGMENTED PSEUDOMONAS PUTIDA: EFFECT OF BUFFERING AGENTS

ASEAN Engineering Journal ◽

10.11113/aej.v11.17860 ◽

2021 ◽

Vol 11 (4) ◽

pp. 1-15

Author(s):

Vongsadet Phommachanh ◽

Wilai Chiemchaisri ◽

Chart Chiemchaisri

Keyword(s):

Pseudomonas Putida ◽

Methane Production ◽

Fed Batch ◽

Excess Sludge ◽

Oil And Grease ◽

Digestion Process ◽

The Third ◽

Methane Production Rate ◽

Different Doses ◽

Additional Nitrogen

This study aims to investigate the bio-augmentation of Pseudomonas putida for initializing fat, oil,and grease (FOG) biodegradation in a co-digestion of the greasy waste and the membranebioreactor (MBR) excess sludge. The MBR sludge could be an additional nitrogen sourceconcurrently as a waste matrix fluidizer. Three rounds of a fed-batch of an HRT of 56-71 dayswere carried out. The first (B1) and second (B2) batches using phosphate (Na2HPO4) solution as abuffering system. It showed that the digesters with bio-augmented P. putida could remove moreFOG than that of the control. In the third batch (B3), the buffering solution was changed tobicarbonate (NaHCO3) with the interval bio-augmentation of P. putida in different doses; the 250ml (B3, T-250) and the 1000 ml (B3, T-1000) of P. putida culture every two weeks dosing. Thehighest FOG removal was found in both conditions with the removal efficiency of 79.77%. Thisstudy suggests that bicarbonate was a suitable buffer in the co-digestion process for the intervalbio-augmentation of P. putida. Moreover, it showed that a higher interval dose (B3, T-1000) of P.putida gave a more methane production rate of 981.08 ml/g TVS. d compared to the lower dose ofB3(T-250) with 353.75 ml/g TVS. d.

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Enhanced Methane Production from Anaerobic Digestion of Disintegrated and Deproteinized Excess Sludge

Biotechnology Letters ◽

10.1007/s10529-006-0012-9 ◽

2006 ◽

Vol 28 (8) ◽

pp. 531-538 ◽

Cited By ~ 21

Author(s):

Rong Cui ◽

Deokjin Jahng

Keyword(s):

Anaerobic Digestion ◽

Methane Production ◽

Excess Sludge

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Biohydrogen and methane production by co-digestion of cassava stillage and excess sludge under thermophilic condition

Bioresource Technology ◽

10.1016/j.biortech.2010.12.012 ◽

2011 ◽

Vol 102 (4) ◽

pp. 3833-3839 ◽

Cited By ~ 65

Author(s):

Wen Wang ◽

Li Xie ◽

Jinrong Chen ◽

Gang Luo ◽

Qi Zhou

Keyword(s):

Methane Production ◽

Excess Sludge ◽

Thermophilic Condition

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Calcium Peroxide Promoted Anaerobic Co-digestion of Plant Waste and Excess Sludge to Produce Methane

10.21203/rs.3.rs-339830/v1 ◽

2021 ◽

Author(s):

Yongliang Wang ◽

Xiaohui Zhou ◽

Bin Dai ◽

Xiaoqiang Zhu

Keyword(s):

Methane Production ◽

Suspended Solids ◽

Anaerobic Fermentation ◽

Oxygen Demand ◽

Excess Sludge ◽

Calcium Peroxide ◽

Volatile Solids ◽

Plant Waste ◽

Soluble Chemical Oxygen Demand ◽

Optimal Mixing

Abstract Plant waste (PW) and excess sludge (ES) are two main organic matters of municipal solid waste. However, there are few reports on their anaerobic co-digestion. In this work, the mixed proportion of PW and ES anaerobic co digestion was first optimized at mesophilic temperature, and then the anaerobic co-digestion of PW and ES was enhanced with strong oxidant calcium peroxide (CP). The results showed that the optimal mixing ratio of PW and ES was 1/1 (in terms of volatile solids), and the C/N of mixed digestion substrate was 23.5/1, the maximum methane production was 172.6 mL/g (in terms of volatile solids). CP could enhance methane production from anaerobic co-digestion of PW and ES. When the content of CP was 0.2 g/g (in terms of total suspended solids), the maximum methane production was 234.8 mL/g, about 1.4 times of the blank. The mechanism investigation showed that CP promoted the release of organic matter during the co-digestion, and the higher the content of CP, the greater the release of soluble chemical oxygen demand. The presence of appropriate amount of CP promoted the activities of key enzymes in anaerobic fermentation process, and then increased the efficiency of methane production. The results of this work provide an alternative strategy for the resource utilization of PW and ES.

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