Bioproduction of volatile fatty acid from the fermentation of waste activated sludge for in situ denitritation

Wang, Bo; Peng, Yongzhen; Guo, Yuanyuan

doi:10.1016/j.jbiosc.2015.08.007

Cited by 10 publications

(2 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One is the nitrite added, the other is the protonated species of nitrite, free nitrous acid (FNA). Although SFNR (or sludge with FNA treatment) has been well studied in the past years (Wang et al, 2016c;Zhao et al, 2015), no information has been documented so far on the effect of nitrite or FNA on hydrogen production from dark fermentation of WAS.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Free nitrous acid promotes hydrogen production from dark fermentation of waste activated sludge

et al. 2018

View full text Add to dashboard Cite

Simultaneous sludge fermentation and nitrite removal is an effective approach to enhance nutrient removal from low carbon-wastewater. It was found in this work that the presence of nitrite largely promoted hydrogen production from acidic fermentation of waste activated sludge (WAS). The results showed that with an increase of nitrite from 0 to 250 mg/L, the maximal hydrogen yield increased from 8.5 to 15.0 mL/g VSS at pH 5.5 fermentation and 8.1-13.0 mL/g VSS at pH 6 fermentation. However, the maximal hydrogen yield from WAS fermentation at pH 8 remained almost constant (2.9-3.7 mL/g VSS) when nitrite was in the range of 0-250 mg/L. Further analyses revealed that free nitrous acid (FNA) rather than nitrite was the major contributor to the promotion of hydrogen yield. The mechanism investigations showed that FNA not only accelerated the disruption of sludge cells but also promoted the biodegradability of organics released, thereby provided more biodegradable substrates for subsequent hydrogen production. Although FNA inhibited activities of all microbes involved in the anaerobic fermentation, its inhibitions to hydrogen consumers were much severer than those to hydrolytic microorganisms and hydrogen producers. Further investigations with microbial community showed that FNA increased the abundances of hydrogen producers (e.g., Citrobacter sp.) and denitrifiers (e.g., Dechloromonas sp.), but reduced the abundances of hydrogen consumers (e.g., Clostridium_aceticum). This work demonstrated for the first time that FNA in WAS fermentation systems enhanced hydrogen production. The findings obtained expand the application field of FNA and may provide supports for sustainable operation of wastewater treatment plants.

show abstract

Section: Accepted Manuscriptmentioning

confidence: 99%

Free nitrous acid promotes hydrogen production from dark fermentation of waste activated sludge

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The treatment and disposal of waste activated sludge have become one of the most important and urgent problems [3,4]. Organic substance which is the majority of waste activated sludge can be converted into volatile fatty acids (VFAs) by anaerobic microorganisms [5]. This bioprocess for the generation of VFAs not only achieves the objective of controlling pollution and reducing sludge volumes, but also efficiently utilizes organic substances in sludge [6].…”

Section: Introductionmentioning

confidence: 99%

Improved Bioconversion of Volatile Fatty Acids from Waste Activated Sludge by Trace Element Requirement

Liu¹,

Chen²,

Wang³

et al. 2017

dteees

View full text Add to dashboard Cite

Anaerobic bacteria involved in the bioconversion of volatile fatty acids (VFAs) have inherent requirements for trace metals. It is inferred that waste activated sludge contains inadequate amounts of bioavailable trace metals for the high-rate generation of VFAs, resulting in the poor yield of VFAs without any other obvious reason. Therefore, minimum requirements for trace metals including Zn, Co, Cu, Fe, Mn and Mo in the generation of VFAs from waste activated sludge were investigated. The experimental results showed that all of the metal elements used in this study had the potential to improve the generation of VFAs despite variation in the yield of total VFAs. The improved influences were as follows: Fe > Co > Mn > Cu > Zn > Mo. When increasing the content of Fe from 0 to 0.10%, the yield of total VFAs rapidly raised from 0.204 g/g-VS to 0.318 g/g-VS. The maximum yield of total VFAs was achieved with Fe, followed by Co, and they increased 56% and 42% more than the control, respectively. Acetic acids were the most prevalent product no matter what metal element was. Its percentages in total VFAs were more than 50%, which were much higher than any other individual VFAs. Butyric acids were the second major individual VFAs with a percentage of more 13% accounting for total VFAs. Adding Co could obviously improve the generation of acetic acids, and the maximum yield of acetic acids reached 0.206 g/g-VS. Also, n-butyric acids were significantly produced by the addition of Fe, and its maximum value was 0.100 g/g-VS, that is to say 325.8% higher than the yield of the control (0.040 g/g-VS).

show abstract

Achieving simultaneous nitrogen removal of low C/N wastewater and external sludge reutilization in a sequencing batch reactor

Guo

Peng

Wang

et al. 2016

Chemical Engineering Journal

View full text Add to dashboard Cite

Bioproduction of volatile fatty acid from the fermentation of waste activated sludge for in situ denitritation

Cited by 10 publications

References 21 publications

Free nitrous acid promotes hydrogen production from dark fermentation of waste activated sludge

Free nitrous acid promotes hydrogen production from dark fermentation of waste activated sludge

Improved Bioconversion of Volatile Fatty Acids from Waste Activated Sludge by Trace Element Requirement

Achieving simultaneous nitrogen removal of low C/N wastewater and external sludge reutilization in a sequencing batch reactor

Contact Info

Product

Resources

About