Conditioning of wastewater sludge using freezing and thawing: Role of curing

Hu, Kai; Jiang, Junqiu; Zhao, Qingliang; Lee, Dong Hoon; Wang, Kun; Qiu, Wei

doi:10.1016/j.watres.2011.08.064

Cited by 93 publications

(38 citation statements)

References 33 publications

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“…Temperature, freezing rate and pre-treatment time (curing time) are relevant operational parameters that affected dewaterability (Hu et al, 2011;Vesilind and Martel, 1990;Wang et al, 2001). Lower freezing rates and colder temperatures result in better dewatering (Hu et al, 2011;Vesilind and Martel, 1990). Refreezing, in multiple freeze and thaw cycles, enlarges ice crystals, Table 5 Effects on the biodegradation of WAS after microwave pre-treatment.…”

Section: Process Description and Mode Of Actionmentioning

confidence: 99%

Pre-treatments to enhance the biodegradability of waste activated sludge: Elucidating the rate limiting step

Gonzalez

Hendriks

Lier

et al. 2018

Biotechnology Advances

210

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Pre-treatments for waste activated sludge (WAS) are, in most cases, an attempt to increase the biodegradation and/or improve hydrolysis rate of WAS after anaerobic digestion. This review presents an extensive analysis of WAS pre-treatments effectiveness focusing on increasing the biodegradability. In the first part of the review, WAS is considered as a cluster of organic components: proteins, carbohydrates, humic substances and cells. Based on this breakdown into components, the effect of different pre-treatments on each component (and in combination) is described. Also, possible reasons for the contradictory results frequently found among different studies dealing with the same pre-treatment are included. In the second part, the review describes the effects on volatile solids removal by digestion after pre-treatment and on the dewaterability of the final digestate. The energy balance and potential limiting factors for each pre-treatment are also taken into account. From the published works it is concluded that some pre-treatment techniques, such as thermal hydrolysis, thermal phased anaerobic digestion and low-temperature pre-treatment are effective ways to increase energy production and to improve other sludge properties, such as dewatering. However, these techniques are very energy intensive and require a large capital outlay, so research on milder pre-treatment techniques is valuable.

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Section: Process Description and Mode Of Actionmentioning

confidence: 99%

Pre-treatments to enhance the biodegradability of waste activated sludge: Elucidating the rate limiting step

Gonzalez

Hendriks

Lier

et al. 2018

Biotechnology Advances

210

View full text Add to dashboard Cite

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“…Freeze-thaw methods (Parker et al, 1998) have been found effective to transform residuals from semisolids to slurries with visible free water, but only after the sample has been allowed enough curing time. By freezing bulk sludge, Hu et al (2011) found COD solubilization was heavily dependent on sludge curing time.…”

Section: Introductionmentioning

confidence: 99%

Investigations into Improving Dewaterability at a Bio‐P/Anaerobic Digestion Plant

Alm

Sealock

Nollet

et al. 2016

Water Environment Research

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Metropolitan Council Environmental Services has observed poorer than expected dewatering performance at its Empire Plant. This plant has both anaerobic digestion and enhanced biological phosphorus removal in its treatment train. A research program using pilot-scale anaerobic digesters investigated potential solutions to the plant's poor dewaterability. The dewaterability goal was to increase the cake solids from 12% total solids (TS) to 16% TS or higher. This research investigated 20 different reactor conditions including chemical, feed sludge, and digested sludge treatments. At the pilot scale, unaerated storage of waste activated sludge prior to thickening and addition of ferric chloride to digestion was found to achieve dewatered cake solids of nearly 17% TS with the added benefit of reducing polymer demand. Issues including the amount of chemical required and the resulting volatile solids destruction influence the viability of the process change, so a full-scale pilot and financial analysis is recommended before making permanent process changes.

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“…The DS was a mixture characterized by multi phases (solid and liquid phases). For the insoluble part, which was termed as extracellular biological organic matter (EBOM), NH 4 OH was employed as an effective extractant following the specifically described extraction procedures [16,17]. The microbial communities of anode biofilm from F/T-MEC were examined by high-throughput 16 S rRNA pyrosequencing as described [11].…”

Section: Methodsmentioning

confidence: 99%

Combined freezing-thawing pretreatment and microbial electrolysis cell for enhancement of highly concentrated organics degradation from dewatered sludge

Jia

Cheng

et al. 2020

Bioengineered

Self Cite

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2020) Combined freezing-thawing pretreatment and microbial electrolysis cell for enhancement of highly concentrated organics degradation from dewatered sludge, Bioengineered, 11:1, 301-310, ABSTRACTThe influence of freezing-thawing (F/T) pretreatment on the degradation of highly concentrated organic matters from dewatered sludge (DS) in microbial electrolysis cell (MEC) was investigated in this study. Extended freezing disintegrated the DS matrix and resulted in accelerated hydrolysis rate. The biogas production and stabilization were increased due to the pretreatment by 25-70% of H 2 production rate and 17.8-33.8% of COD reduction rate, respectively. Fourier transform infrared spectroscopy analysis indicated that the pretreatment was unable to alter the bioelectrochemical reactions except for accelerating degradation rate. Excitation and emission matrix (EEM) spectra showed that aromatic protein and soluble microbial products (SMPs)like materials in DS were increasingly solubilized by the pretreatment and significantly removed during electrogenesis. The F/T-pretreated DS favored the enrichment of exoelectrogens in MEC. ARTICLE HISTORY

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Conditioning of wastewater sludge using freezing and thawing: Role of curing

Cited by 93 publications

References 33 publications

Pre-treatments to enhance the biodegradability of waste activated sludge: Elucidating the rate limiting step

Pre-treatments to enhance the biodegradability of waste activated sludge: Elucidating the rate limiting step

Investigations into Improving Dewaterability at a Bio‐P/Anaerobic Digestion Plant

Combined freezing-thawing pretreatment and microbial electrolysis cell for enhancement of highly concentrated organics degradation from dewatered sludge

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