scholarly journals Complete Digestion of Sewage Sludge Using Wet-Oxidation and Subsequently Simultaneous Removal of Residual NH4+ and Volatile Fatty Acids by Biological Treatment

2004 ◽  
Vol 40 (3) ◽  
pp. 89-96 ◽  
Author(s):  
YIMIN ZHU ◽  
TORU SHIGEMATSU ◽  
LIU KAI ◽  
IKBAL ◽  
SHIGERU MORIMURA ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Sewage Sludge ◽  
Biological Treatment ◽  
Volatile Fatty Acids ◽  
Wet Oxidation ◽  
Simultaneous Removal ◽  
Complete Digestion

Acetic acid recovery from a hybrid biological–hydrothermal treatment process of sewage sludge – a pilot plant study

2015 ◽  
Vol 71 (5) ◽  
pp. 734-739 ◽  
Author(s):  
J. Andrews ◽  
P. Dare ◽  
G. Estcourt ◽  
D. Gapes ◽  
R. Lei ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Acetic Acid ◽  
Sewage Sludge ◽  
Pilot Plant ◽  
Volatile Fatty Acids ◽  
Anaerobic Fermentation ◽  
Biological Nutrient Removal ◽  
Wet Oxidation ◽  
Batch Mode ◽  
Oxidation Reactor

A two-stage process consisting of anaerobic fermentation followed by sub-critical wet oxidation was used to generate acetic acid from sewage sludge at pilot scale. Volatile fatty acids, dominated by propionic acid, were produced over 4–6 days in the 2,000 L fermentation reactor, which also achieved 31% solids reduction. Approximately 96% of the carbon was retained in solution over the fermentation stage. Using a 200 L wet oxidation reactor operating in batch mode, the second stage achieved 98% volatile suspended solids (VSS) destruction and 67% total chemical oxygen demand (tCOD) destruction. Acetic acid produced in this stage was recalcitrant to further degradation and was retained in solution. The gross yield from VSS was 16% for acetic acid and 21% for volatile fatty acids across the process, higher than reported yields for wet oxidation alone. The pilot plant results showed that 72% of the incoming phosphorus was retained in the solids, 94% of the nitrogen became concentrated in solution and 41% of the carbon was converted to a soluble state, in a more degradable form. Acetic acid produced from the process has the potential to be used to offset ethanol requirements in biological nutrient removal plants.

Volatile fatty acids production from biowaste at mechanical-biological treatment plants: Focusing on fermentation temperature

2020 ◽  
Vol 314 ◽  
pp. 123729 ◽  
Author(s):  
David Fernández-Domínguez ◽  
Sergi Astals ◽  
Miriam Peces ◽  
Nicola Frison ◽  
David Bolzonella ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Biological Treatment ◽  
Volatile Fatty Acids ◽  
Fermentation Temperature

scholarly journals Volatile Fatty Acids Production from Codigestion of Food Waste and Sewage Sludge Based on β-Cyclodextrins and Alkaline Treatments

Archaea ◽  
2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Xue Yang ◽  
Xiang Liu ◽  
Si Chen ◽  
Guangmin Liu ◽  
Shuyan Wu ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Sewage Sludge ◽  
Food Waste ◽  
Bacterial Communities ◽  
Volatile Fatty Acids ◽  
Integrated Treatment ◽  
Hydrolysis Rate ◽  
Novel Technology ◽  
Initial Ph ◽  
Hydrolysis Of

Volatile fatty acids (VFAs) are preferred valuable resources, which can be produced from anaerobic digestion process. This study presents a novel technology using β-cyclodextrins (β-CD) pretreatment integrated alkaline method to enhance VFAs production from codigestion of food waste and sewage sludge. Experiment results showed that optimized ratio of food waste to sewage sludge was 3 : 2 because it provided adequate organic substance and seed microorganisms. Based on this optimized ratio, the integrated treatment of alkaline pH 10 and β-CD addition (0.2 g/g TS) performed the best enhancement on VFAs production, and the maximum VFAs production was 8631.7 mg/L which was 6.13, 1.38, and 1.57 times higher than that of control, initial pH 10, and 0.2 g β-CD/g TS treatment, respectively. Furthermore, the hydrolysis rate of protein and polysaccharides was greatly improved in integration treatment, which was 1.18–3.45 times higher than that of other tests. Though the VFAs production and hydrolysis of polymeric organics were highly enhanced, the primary bacterial communities with different treatments did not show substantial differences.

Production of propionic acid-enriched volatile fatty acids from co-fermentation liquid of sewage sludge and food waste using Propionibacterium acidipropionici

2013 ◽  
Vol 68 (9) ◽  
pp. 2061-2066 ◽  
Author(s):  
Xiang Li ◽  
Hui Mu ◽  
Yinguang Chen ◽  
Xiong Zheng ◽  
Jingyang Luo ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Sewage Sludge ◽  
Propionic Acid ◽  
Food Waste ◽  
Volatile Fatty Acids ◽  
Biological Nutrient Removal ◽  
Distribution Analysis ◽  
Propionibacterium Acidipropionici ◽  
Second Stage ◽  
Fermentation Liquid

Volatile fatty acids (VFA), derived from sludge fermentation, have been used as one effective carbon source for biological nutrient removal, especially favorable with VFA containing with high levels of propionic acid. In this paper, a new fermentation method was employed to significantly produce the propionic acid-enriched VFA from the co-fermentation liquid of sewage sludge and food waste: including (1) mixing food waste with sludge in the anaerobic digester (the first stage) and (2) separating the mixture, sterilizing the first stage liquid and fermenting it after inoculation with Propionibacterium acidipropionici (the second stage). The effect of the key parameters including pH, the mixing ratio of the food waste and sludge, fermentation time and temperature of the first stage on the propionic acid-enriched VFA production (the second stage) was individually discussed. By the molecular weight distribution analysis, the comparison of the solubilisation and hydrolysis process in difference parameters was fully elaborated. The optimal combination of the parameters was then obtained. Finally, the propionic acid-enriched VFA fermentation was successfully conducted in a semi-continuous reactor using the first stage liquid from the optimal condition.

Volatile fatty acids platform from thermally hydrolysed secondary sewage sludge enhanced through recovered micronutrients from digested sludge

2016 ◽  
Vol 100 ◽  
pp. 267-276 ◽  
Author(s):  
Philemon J. Kumi ◽  
Adam Henley ◽  
Achame Shana ◽  
Victoria Wilson ◽  
Sandra R. Esteves
Keyword(s):  
Fatty Acids ◽  
Sewage Sludge ◽  
Volatile Fatty Acids ◽  
Digested Sludge

Valorization of sewage sludge in co-digestion with cheese whey to produce volatile fatty acids

2020 ◽  
Vol 118 ◽  
pp. 541-551
Author(s):  
Ruth Iglesias-Iglesias ◽  
Christian Kennes ◽  
María C. Veiga
Keyword(s):  
Fatty Acids ◽  
Sewage Sludge ◽  
Volatile Fatty Acids ◽  
Cheese Whey
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