Insight into the roles of packing carriers and ultrasonication in anaerobic side-stream reactor coupled membrane bioreactors: Sludge reduction performance and mechanism

Zheng, Yue; Cheng, Cheng; Zhou, Zhen; Pang, Hongjian; Chen, Liuyu; Jiang, Lu-Man

doi:10.1016/j.watres.2019.02.039

Cited by 86 publications

(24 citation statements)

References 37 publications

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“…The same decrease and following increase were observed in a different study by our group which involved WAS from the same treatment plant (Apul and Sanin 2010). This phenomenon was attributed to the complex sono-chemical reactions that may lead to recapturing of the organics within flocs and cell damage resulting in inhibited activity (Apul and Sanin 2010;Zheng et al 2019). Results presented by Zheng et al (2019) also show minor increases in suspended solid concentration with increased sonication duration (or energy input); however, their findings are not sufficient in describing the phenomenon either.…”

Section: Increase In Scod Concentrationssupporting

confidence: 68%

“…This phenomenon was attributed to the complex sono-chemical reactions that may lead to recapturing of the organics within flocs and cell damage resulting in inhibited activity (Apul and Sanin 2010;Zheng et al 2019). Results presented by Zheng et al (2019) also show minor increases in suspended solid concentration with increased sonication duration (or energy input); however, their findings are not sufficient in describing the phenomenon either. Another cause, as suggested by Apul and Sanin (2010), involves local thermal reactions, which may occur even in temperature-controlled experimental setups.…”

Section: Increase In Scod Concentrationsmentioning

confidence: 99%

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Effects of anaerobic digestion enhanced by ultrasound pretreatment on the fuel properties of municipal sludge

Çelebi

Aksoy

Sanin

2020

Environ Sci Pollut Res

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In this study, effects of ultrasound pretreatment on combustion characteristics and elemental composition of municipal sludge were examined for energy-based evaluation of sludge pretreatment. Waste activated sludge (WAS) from a municipal wastewater treatment plant was pretreated with ultrasound at varying durations and was subjected to anaerobic digestion in a biochemical methane potential (BMP) assay. Changes in gas production rates, calorific value (CV), elemental compositions, and ash contents of sludge samples were examined to assess the effects of pretreatment and digestion. Sonication at 0.73 W/mL enhanced gas production by 28%. Moreover, volatile solids (VS) and chemical oxygen demand (COD) removals increased from 41 to 45% and 33 to 37%, respectively. Following anaerobic digestion, CVs of samples decreased by about 18%. Sonicated samples exhibited a higher decrease. In order to quantify the change in overall energy content, total solids (TS) reduction was also taken into account. Loss was magnified as both CVand the amount of TS that would provide the overall energy were reduced. This loss was 38% for the control group and 41% for the 15 min sonicated sludge. Digestion decreased the C content of sludge by about 20% and H content by 50% due to biogas production. Ash content increased relatively as some of the combustible solids were lost due to digestion. Experimental results indicate that if sludge is to be combusted, digestion with or without ultrasound pretreatment may be disadvantageous if the aim is to maximize energy gain from sludge.

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Section: Increase In Scod Concentrationssupporting

confidence: 68%

Section: Increase In Scod Concentrationsmentioning

confidence: 99%

Effects of anaerobic digestion enhanced by ultrasound pretreatment on the fuel properties of municipal sludge

Çelebi

Aksoy

Sanin

2020

Environ Sci Pollut Res

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“…Several authors also investigated the possibility of adopting suitable sludge retention times in the tank in order to achieve zero net growth [73,74]. Moreover, in the last decade, MMBR systems have been coupled with other disintegration treatments (e.g., ozonation, ultrasonication) in order to increase the biomass decay rate, maintaining a relatively low concentration of TSS in the MMBR system [25,75,76]. Foladori et al [25] reported that these applications, which can only be used in the water line, make it possible to achieve a reduction of 99% in terms of TSS.…”

Section: Mesophilic Membrane Bioreactor (Mmbr)mentioning

confidence: 99%

What Advanced Treatments Can Be Used to Minimize the Production of Sewage Sludge in WWTPs?

et al. 2019

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Similar to other types of waste, sewage sludge (SS) must be minimized, not only to respect the European Directive 2018/851 on waste, but also because the cost of sludge management is approximately 50% of the total running costs of a wastewater treatment plant (WWTP). Usually, minimization technologies can involve sewage sludge production with three different strategies: (i) adopting a process in the water line that reduces the production of sludge; (ii) reducing the water content (dewatering processes) or (iii) reducing the fraction of volatile solids (stabilization). This review, based on more than 130 papers, aims to provide essential information on the process, such as the advantages, the drawbacks and the results of their application. Moreover, significant information on the technologies still under development is provided. Finally, this review reports a discussion on the impact of the application of the proposed processes in the sludge line on a WWTP with a capacity exceeding 100,000 population equivalent (PE).

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“…The similarity distances to the RS group manifested that high temperatures (100-225 C) had a greater impact on organic dissolution than the treatment time and NaOH dosage. 1,6,7 Therefore, the concentrations of soluble PR and PS were 2736.6 and 204.4 mg L À1 aer HAT (225 C, NaOH 9 g L À1 and 30 min), respectively (Fig. S3 †).…”

Section: Unconstrained Principal Component Analysis (Pca)mentioning

confidence: 97%

Roles of hydrothermal-alkaline treatment in tannery sludge reduction: rheological properties and sludge reduction mechanism analysis

Zhai

Xiong

et al. 2020

RSC Adv.

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Insight into the roles of packing carriers and ultrasonication in anaerobic side-stream reactor coupled membrane bioreactors: Sludge reduction performance and mechanism

Cited by 86 publications

References 37 publications

Effects of anaerobic digestion enhanced by ultrasound pretreatment on the fuel properties of municipal sludge

Effects of anaerobic digestion enhanced by ultrasound pretreatment on the fuel properties of municipal sludge

What Advanced Treatments Can Be Used to Minimize the Production of Sewage Sludge in WWTPs?

Roles of hydrothermal-alkaline treatment in tannery sludge reduction: rheological properties and sludge reduction mechanism analysis

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