Alkaline fermentation of primary sludge for short-chain fatty acids accumulation and mechanism

Wu, Haixia; Gao, Jia; Yang, Dianhai; Zhou, Qi; Liu, Wei

doi:10.1016/j.cej.2010.02.012

Cited by 89 publications

(32 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the blank sample and the treatment of 25 g PAA/kg DS, propionic acid and iso-valeric acid are the second most dominant VFA. This sequential order is also seen in ultrasonic pre-treatments (Wu et al, 2010;Ferrer et al, 2008;Chen et al, 2007). However, for the treatment of 80 g PAA/kg DS, butyric acid is the second most dominant VFA present in the sludge.…”

Section: Evolution Of Vfa During Digestionmentioning

confidence: 74%

Peracetic acid oxidation as an alternative pre-treatment for the anaerobic digestion of waste activated sludge

Appels

Assche²,

Willems³

et al. 2011

Bioresource Technology

181

View full text Add to dashboard Cite

Section: Evolution Of Vfa During Digestionmentioning

confidence: 74%

Peracetic acid oxidation as an alternative pre-treatment for the anaerobic digestion of waste activated sludge

Appels

Assche²,

Willems³

et al. 2011

Bioresource Technology

181

View full text Add to dashboard Cite

“…According to Zhang et al (2015a), CaO 2 was very effective in sludge solubilization and removal of endocrine disrupting compounds (EDCs). In addition, CaO 2 can be also function as an alkali to improve the sludge hydrolysis due to formation of Ca(OH) 2 (Wu et al, 2010;Zhu et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Enhancement of waste activated sludge dewaterability using calcium peroxide pre-oxidation and chemical re-flocculation

et al. 2016

View full text Add to dashboard Cite

a b s t r a c tThe effects of combined calcium peroxide (CaO 2 ) oxidation with chemical re-flocculation on dewatering performance and physicochemical properties of waste activated sludge was investigated in this study. The evolutions of extracellular polymeric substances (EPS) distribution, composition and morphological properties were analyzed to unravel the sludge conditioning mechanism. It was found that sludge filtration performance was enhanced by calcium peroxide oxidation with the optimal dosage of 20 mg/ gTSS. However, this enhancement was not observed at lower dosages due to the absence of oxidation and the performance deteriorated at higher dosages because of the release of excess EPS, mainly as proteinlike substances. The variation in soluble EPS (SEPS) component can be fitted well with pseudo-zero-order kinetic model under CaO 2 treatment. At the same time, extractable EPS content (SEPS and loosely bound EPS (LB-EPS)) were dramatically increased, indicating sludge flocs were effectively broken and their structure became looser after CaO 2 addition. The sludge floc structure was reconstructed and sludge dewaterability was significantly enhanced using chemical re-flocculation (polyaluminium chloride (PACl), ferric iron (FeCl 3 ) and polyacrylamide (PAM)). The inorganic coagulants performed better in improving sludge filtration dewatering performance and reducing cake moisture content than organic polymer, since they could act as skeleton builders and decrease the sludge compressibility.

show abstract

“…The difference might attribute to that more VFAs generated from anaerobic fermentation were consumed by denitrification under excessive nitrite addition (Wang et al 2014b), and the other reason was likely that the biocidal effects of higher FNA concentration to microorganism. The VFA production observed in this study was compared with other digestion conditions reported in some literature (Wu et al 2010, Huang et al 2014Luo et al 2014), and the results were summarized in Table 3. With the combined use of nitrite pretreatment and pH 10.0, the VFA production was much higher than that reported by other researchers (Table 3), which indicated that nitrite pretreatment and pH 10.0 could efficiently enhance VFA accumulation.…”

Section: Effect Of Nitrite Pretreatment On the Accumulation Of Vfasmentioning

confidence: 97%

Hydrolysis and volatile fatty acids accumulation of waste activated sludge enhanced by the combined use of nitrite and alkaline pH

Huang

Liu

Sun

et al. 2015

Environ Sci Pollut Res

View full text Add to dashboard Cite

Volatile fatty acids (VFAs) production from anaerobic digestion of waste activated sludge (WAS) is often limited by the slow hydrolysis and/or poor substrate availability. Increased attention has been given to enhance the hydrolysis and acidification of WAS recently. This study presented an efficient and green strategy based on the combined use of nitrite pretreatment and alkaline pH to stimulate hydrolysis and VFA accumulation from WAS. Results showed that both proteins and polysaccharides increased in the presence of nitrite, indicating the enhancement of sludge solubilization and hydrolysis processes. Mechanism investigations showed that nitrite pretreatment could disintegrate the sludge particle and disperse extracellular polymeric substances (EPS). Then, anaerobic digestion tests demonstrated VFA production increased with nitrite treatment. The maximal VFA accumulation was achieved with 0.1 g N/L nitrite dosage and pH 10.0 at a sludge retention time (SRT) of 7 days, which was much higher VFA production in comparison with the blank, sole nitrite pretreatment, or sole pH 10. The potential analysis suggested that the combined nitrite pretreatment and alkaline pH is capable of enhancing WAS digestion with a great benefit for biological nutrient removal (BNR).

show abstract

Alkaline fermentation of primary sludge for short-chain fatty acids accumulation and mechanism

Cited by 89 publications

References 28 publications

Peracetic acid oxidation as an alternative pre-treatment for the anaerobic digestion of waste activated sludge

Peracetic acid oxidation as an alternative pre-treatment for the anaerobic digestion of waste activated sludge

Enhancement of waste activated sludge dewaterability using calcium peroxide pre-oxidation and chemical re-flocculation

Hydrolysis and volatile fatty acids accumulation of waste activated sludge enhanced by the combined use of nitrite and alkaline pH

Contact Info

Product

Resources

About