Economical evaluation of sludge reduction and characterization of effluent organic matter in an alternating aeration activated sludge system combining ozone/ultrasound pretreatment

Yang, Shan-Shan; Guo, Wei; Chen, Yidi; Wu, Qinglian; Luo, Haichao; Peng, Simai; Hong, Zheng; Feng, Xiaochi; Zhou, Xu; Ren, Nanqi

doi:10.1016/j.biortech.2014.11.009

Cited by 36 publications

(11 citation statements)

References 32 publications

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“…With the improvement of reactor performance, the intracellular and extracellular fluorescent substances showed different characteristics in different operation phases. This is in coincidence with many other researches57920. Results indicated EEM fluorescence has high relativities with reactor NH 4 + , NO 2 − , TN removal performance (Fig.…”

Section: Discussionsupporting

confidence: 90%

“…Protein is one of the most important fluorophores and it exists in most intracellular and extracellular substances. Protein fluorescence can be used to reflect the content of Chemical Oxygen Demand (COD), Soluble Microbial Product (SMP) of wastewater45 and it were also used to describe the volatile solids reduction in aerobic sludge digestion reactors6. Humic-like acid is another significant fluorophore and its fluorescence is reported to associate with substrate utilization of bacteria7.…”

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confidence: 99%

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The autofluorescence characteristics of bacterial intracellular and extracellular substances during the operation of anammox reactor

Hou

Liu

Feng

2017

Sci Rep

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Anammox is a cost-effective process to treat nitrogenous wastewater. In this work, excitation–emission matrix (EEM) fluorescence spectroscopy was used to characterize the intracellular and extracellular substances of anammox sludge during reactor operation of 276 days. Four main fluorophores were identified from the intracellular substances. Two main protein-like fluorophores were identified from the extracellular substances. Correlation analysis revealed that intracellular 420 peak and humic-like peak had strong correlation with nitrogen removal rate. The two intracellular protein-like peaks had high correlation with MLVSS and MLVSS growth rate. Correlation analysis between different fluorophores discovered that the two peaks in each of these three groups—two intracellular protein-like peaks, two humic acid-like peaks and the two extracellular protein-like peaks had strong intercorrelation, which gave evidence of their homology. A specific method for fluorescence monitoring of anammox reactor were put forward, which included typical fluorescence indexes and their possible values for different operation phases.

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Section: Discussionsupporting

confidence: 90%

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confidence: 99%

The autofluorescence characteristics of bacterial intracellular and extracellular substances during the operation of anammox reactor

Hou

Liu

Feng

2017

Sci Rep

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“…During the first combined stage, US1, DHA activity was enhanced to an average value of 33.16 mg O 2 / (gVSS· d) ±1.49, which supposes a 20.01% increase. This fact has been reports previously [5], [17], [18]. Increase of DHA activity may be adduced to the enhancement of endogenous metabolism, as required energy for labors of cell maintenance and reparation increases with ultrasonication treatment [17], which is, at the same time, one reason for the increase of the sludge reduction rate observed in the synergic system.…”

Section: Dehydrogenase Activitymentioning

confidence: 57%

“…This fact has been reports previously [5], [17], [18]. Increase of DHA activity may be adduced to the enhancement of endogenous metabolism, as required energy for labors of cell maintenance and reparation increases with ultrasonication treatment [17], which is, at the same time, one reason for the increase of the sludge reduction rate observed in the synergic system. When ultrasonication treatment was configured to operate at US2 phase, DHA activity decreased acutely from day 85.…”

Section: Dehydrogenase Activitymentioning

confidence: 57%

Sludge Reduction and General Performance in a Combined US+OSA System

Romero-Pareja¹,

Aragon-Cruz²,

Quiroga-Alonso³

et al. 2017

IJESD

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Abstract-The reduction of sewage sludge generated in wastewater treatment plants is one topic of interest due to the high cost related to the management of this waste and the rising amount of volume at which sludge is produced worldwide. Within the techniques to reduce sludge, the Oxic-Settling-Anaerobic (OSA) process is one of the most promising due to its simplicity and to the absence of negative consequences for system. In the OSA process the recycled sludge is submitted to an anaerobic stage prior to flow again into the biological reactor. In this study, OSA process is run in a lab scale pilot plant together with a lysis step by ultrasound treatment, applied daily to a certain fraction of the total sludge of the system previously to the anaerobic holding tank. Results point to an enhancement of sludge reduction rate for the two sonication applied regimes (45.72% and 78.56%). Also the TN removal rate increases from 21.95% during control stage to 47.28% during the first of the two ultrasound regimes applied (US1). A too intense sonication treatment during the second synergic stage (US2) is reported to lead to a serious damage of system. Increases of dehydrogenase activity were described during both stages.

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“…Different pretreatments have been assessed, including ultrasonic treatment [18, 19], thermal treatment [20, 21], acid and alkaline treatment [22, 23], ozone treatment [24, 25], combined treatment [26–28], and so on. Among these methods, alkali treatment is proved to be effective in inhibiting methanogens activity for VFAs accumulation [22, 29].…”

Section: Introductionmentioning

confidence: 99%

Impact of Alkaline Pretreatment to Enhance Volatile Fatty Acids (VFAs) Production from Rice Husk

Fang

Huang

et al. 2019

Biochemistry Research International

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This study explores the use of alkaline pretreatments to improve the hydrolyzation of rice husks to produce volatile fatty acids (VFAs). The study investigated the effects of reagent concentration and pretreatment time on protein, carbohydrates, and dissolved chemical oxygen demand (SCOD) dissolution after the pretreatment. The optimum alkaline pretreatment conditions were 0.30 g NaOH (g VS)−1, with a reaction time of 48 h. The experimental results show that when comparing the total VFA (TVFA) yields from the alkaline-pretreated risk husk with those from the untreated rice husk, over 14 d and 2 d, the maximum value reached 1237.7 and 716.0 mg·L−1 with acetic acid and propionic acid and with acetic acid and butyric acid, respectively. After the alkaline pretreatment, TVFAs increased by 72.9%; VFA accumulation grew over time. The study found that alkaline pretreatment can improve VFA yields from rice husks and transform butyric acid fermentation into propionic acid fermentation. The study results can provide guidelines to support the comprehensive utilization of rice husk and waste treatment.

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Economical evaluation of sludge reduction and characterization of effluent organic matter in an alternating aeration activated sludge system combining ozone/ultrasound pretreatment

Cited by 36 publications

References 32 publications

The autofluorescence characteristics of bacterial intracellular and extracellular substances during the operation of anammox reactor

The autofluorescence characteristics of bacterial intracellular and extracellular substances during the operation of anammox reactor

Sludge Reduction and General Performance in a Combined US+OSA System

Impact of Alkaline Pretreatment to Enhance Volatile Fatty Acids (VFAs) Production from Rice Husk

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