Mechanistic insights into a novel nitrilotriacetic acid-Fe0 and CaO2 process for efficient anaerobic digestion sludge dewatering at near-neutral pH

2020 ◽  
Vol 184 ◽  
pp. 116149
Author(s):  
Jialin Liang ◽  
Liang Zhang ◽  
Wangwang Yan ◽  
Yan Zhou
Keyword(s):  
Anaerobic Digestion ◽  
Nitrilotriacetic Acid ◽  
Sludge Dewatering ◽  
Neutral Ph

Extracellular polymeric substances and dewaterability of waste activated sludge during anaerobic digestion

2014 ◽  
Vol 70 (9) ◽  
pp. 1555-1560 ◽  
Author(s):  
Fenxia Ye ◽  
Xinwen Liu ◽  
Ying Li
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Extracellular Polymeric Substance ◽  
Extracellular Polymeric Substances ◽  
Waste Activated Sludge ◽  
Sludge Dewatering ◽  
Capillary Suction ◽  
Relationship Analysis ◽  
The Relationship ◽  
Insight Into

Anaerobic digestion of waste activated sludge was conducted to gain insight into the mechanisms underlying change in sludge dewaterability during its anaerobic digestion. Unexpectedly, the results indicated that sludge dewatering properties measured by capillary suction time only deteriorated after 10 days of anaerobic digestion, after which dewaterability recovered and remained stable. The loosely bound extracellular polymeric substance (LB-EPS) content increased three-fold after 20 days of anaerobic digestion, and did not change significantly during the remaining 30 days. The tightly bound EPS (TB-EPS) content reduced slightly after 20 days of anaerobic digestion, and stabilized during the last 30 days. Polysaccharides (PS) and proteins (PN) content in LB-EPS increased after 10 days of anaerobic digestion. However, PS and PN contents in TB-EPS decreased slightly. The relationship analysis showed that only LB-EPS correlated with dewaterability of the sludge during anaerobic digestion.

A highly efficient flow-through electro-Fenton system enhanced with nitrilotriacetic acid for phenol removal at neutral pH

2019 ◽  
Vol 697 ◽  
pp. 134173 ◽  
Author(s):  
Yinqiao Zhang ◽  
Qizhan Zhang ◽  
Sijin Zuo ◽  
Minghua Zhou ◽  
Yuwei Pan ◽  
...  
Keyword(s):  
Nitrilotriacetic Acid ◽  
Phenol Removal ◽  
Neutral Ph ◽  
Highly Efficient ◽  
Flow Through ◽  
Fenton System

scholarly journals Hydrogen and Methane Production Under Conditions of Anaerobic Digestion of Key-Lime and Cabbage Wastes

2019 ◽  
Vol 39 (3) ◽  
pp. 243 ◽  
Author(s):  
Gaweł Sołowski ◽  
Izabela Konkol ◽  
Bartosz Hrycak ◽  
Dariusz Czylkowski
Keyword(s):  
Anaerobic Digestion ◽  
Hydrogen Production ◽  
Methane Production ◽  
Substrate Concentration ◽  
Suspended Solids ◽  
Batch Process ◽  
Citrus Aurantifolia ◽  
Total Solids ◽  
Neutral Ph ◽  
Key Lime

In this article, the results of key lime fruit (Citrus aurantifolia) wastes and cabbage (Brassica L.) wastes anaerobic digestion are presented. Anaerobic digestion of the wastes was performed in batch process, neutral pH (key-lime 7.47 and cabbage 7.67) and substrate concentration of Volatile Suspended Solids (VSS) 10 gVSS/L. One of the aims of this research was to check the availability of these substrates to be the source of methane and hydrogen. Key lime wastes produced 32 times more methane than raw cabbage. However, hydrogen production from cabbage was 149 times higher than key lime. The percentage of methane production in cabbage was up to 81% and in key lime was up to 75%. This research showed from the substrates comparison that efficient hydrogen production is less dependent on low pKa, pH than on total solids of the substrates.

The behaviour of nitrilotriacetic acid during the anaerobic digestion of sewage sludge

1982 ◽  
Vol 16 (6) ◽  
pp. 973-980 ◽  
Author(s):  
P.W.W. Kirk ◽  
J.N. Lester ◽  
R. Perry
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Nitrilotriacetic Acid

Floc structure and the role of cations

2001 ◽  
Vol 44 (10) ◽  
pp. 209-213 ◽  
Author(s):  
J.T. Novak ◽  
C.D. Muller ◽  
S.N. Murthy
Keyword(s):  
Anaerobic Digestion ◽  
Sludge Dewatering ◽  
Aerobic Digestion ◽  
Floc Structure ◽  
Floc Strength

Cations have been found to influence the settling and dewatering characteristics of biological sludges. This research was directed at investigating the role of iron in floc stability of sensitivity to shear and in the response to anaerobic and aerobic digestion. Our data shows that iron may contribute to floc strength and it appears that the deterioration in sludge dewatering during anaerobic digestion is associated with the reduction and solubilization of iron. Further, it is the presence of proteins in solution that contributes to poor dewatering and to the demand for conditioning chemicals. The addition of iron for improving dewatering shows that iron may selectively coagulate solution proteins.

Biogas production and microbial community shift through neutral pH control during the anaerobic digestion of pig manure

2016 ◽  
Vol 217 ◽  
pp. 44-49 ◽  
Author(s):  
Jun Zhou ◽  
Rui Zhang ◽  
Fenwu Liu ◽  
Xiaoyu Yong ◽  
Xiayuan Wu ◽  
...  
Keyword(s):  
Microbial Community ◽  
Anaerobic Digestion ◽  
Biogas Production ◽  
Ph Control ◽  
Pig Manure ◽  
Neutral Ph ◽  
Community Shift
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