Ultrasound assisted method to increase soluble chemical oxygen demand (SCOD) of sewage sludge for digestion

Antti Grönroos (Corresponding Author), Hanna Kyllönen, Kirsi Korpijärvi, Pentti Pirkonen, Teija Paavola, Jari Jokela, Jukka Rintala

Research output: Contribution to journalArticleScientificpeer-review

168 Citations (Scopus)

Abstract

The aim of this study was to clarify the possibilities to increase the amount of soluble chemical oxygen demand (SCOD) and methane production of sludge using ultrasound technologies with and without oxidising agents. The study was done using multivariate data analyses. The most important factors affected were discovered. Ultrasonically assisted disintegration increased clearly the amount of SCOD of sludge. Also more methane was produced from treated sludge in anaerobic batch assays compared to the sludge with no ultrasonic treatment. Multivariate data analysis showed that ultrasonic power, dry solid content of sludge (DS), sludge temperature and ultrasonic treatment time have the most significant effect on the disintegration. It was also observed that in the reactor studied energy efficiency with high ultrasound power together with short treatment time was higher than with low ultrasound power with long treatment time. When oxidising agents were used together with ultrasound no increase in SCOD was achieved compared the ultrasonic treatment alone and only a slight increase in total organic carbon of sludge was observed. However, no enhancement in methane production was observed when using oxidising agents together with ultrasound compared the ultrasonic treatment alone. Ultrasound propagation is an important factor in ultrasonic reactor scale up. Ultrasound efficiency rose linearly with input power in sludge at small distances from the transducer. Instead, ultrasound efficiency started even to decrease with input power at long distances from the transducer.
Original languageEnglish
Pages (from-to)115 - 120
Number of pages6
JournalUltrasonics Sonochemistry
Volume12
Issue number1-2
DOIs
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed

Fingerprint

Biological Oxygen Demand Analysis
sewage
sludge
Chemical oxygen demand
Sewage sludge
Sewage
Digestion
Ultrasonics
ultrasonic processing
oxygen
Methane
Oxidants
methane
disintegration
Transducers
transducers
Multivariate Analysis
ultrasonics
reactors
Disintegration

Keywords

  • ultrasound
  • soluble chemical oxygen demand
  • SCOD
  • sewage sludge
  • sludge
  • sludge processing
  • sludge disintegration
  • oxidising agents
  • anaerobic digestion
  • wastewater treatmen
  • wastewaters

Cite this

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title = "Ultrasound assisted method to increase soluble chemical oxygen demand (SCOD) of sewage sludge for digestion",
abstract = "The aim of this study was to clarify the possibilities to increase the amount of soluble chemical oxygen demand (SCOD) and methane production of sludge using ultrasound technologies with and without oxidising agents. The study was done using multivariate data analyses. The most important factors affected were discovered. Ultrasonically assisted disintegration increased clearly the amount of SCOD of sludge. Also more methane was produced from treated sludge in anaerobic batch assays compared to the sludge with no ultrasonic treatment. Multivariate data analysis showed that ultrasonic power, dry solid content of sludge (DS), sludge temperature and ultrasonic treatment time have the most significant effect on the disintegration. It was also observed that in the reactor studied energy efficiency with high ultrasound power together with short treatment time was higher than with low ultrasound power with long treatment time. When oxidising agents were used together with ultrasound no increase in SCOD was achieved compared the ultrasonic treatment alone and only a slight increase in total organic carbon of sludge was observed. However, no enhancement in methane production was observed when using oxidising agents together with ultrasound compared the ultrasonic treatment alone. Ultrasound propagation is an important factor in ultrasonic reactor scale up. Ultrasound efficiency rose linearly with input power in sludge at small distances from the transducer. Instead, ultrasound efficiency started even to decrease with input power at long distances from the transducer.",
keywords = "ultrasound, soluble chemical oxygen demand, SCOD, sewage sludge, sludge, sludge processing, sludge disintegration, oxidising agents, anaerobic digestion, wastewater treatmen, wastewaters",
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Ultrasound assisted method to increase soluble chemical oxygen demand (SCOD) of sewage sludge for digestion. / Grönroos, Antti (Corresponding Author); Kyllönen, Hanna; Korpijärvi, Kirsi; Pirkonen, Pentti; Paavola, Teija; Jokela, Jari; Rintala, Jukka.

In: Ultrasonics Sonochemistry, Vol. 12, No. 1-2, 2005, p. 115 - 120.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Ultrasound assisted method to increase soluble chemical oxygen demand (SCOD) of sewage sludge for digestion

AU - Grönroos, Antti

AU - Kyllönen, Hanna

AU - Korpijärvi, Kirsi

AU - Pirkonen, Pentti

AU - Paavola, Teija

AU - Jokela, Jari

AU - Rintala, Jukka

PY - 2005

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N2 - The aim of this study was to clarify the possibilities to increase the amount of soluble chemical oxygen demand (SCOD) and methane production of sludge using ultrasound technologies with and without oxidising agents. The study was done using multivariate data analyses. The most important factors affected were discovered. Ultrasonically assisted disintegration increased clearly the amount of SCOD of sludge. Also more methane was produced from treated sludge in anaerobic batch assays compared to the sludge with no ultrasonic treatment. Multivariate data analysis showed that ultrasonic power, dry solid content of sludge (DS), sludge temperature and ultrasonic treatment time have the most significant effect on the disintegration. It was also observed that in the reactor studied energy efficiency with high ultrasound power together with short treatment time was higher than with low ultrasound power with long treatment time. When oxidising agents were used together with ultrasound no increase in SCOD was achieved compared the ultrasonic treatment alone and only a slight increase in total organic carbon of sludge was observed. However, no enhancement in methane production was observed when using oxidising agents together with ultrasound compared the ultrasonic treatment alone. Ultrasound propagation is an important factor in ultrasonic reactor scale up. Ultrasound efficiency rose linearly with input power in sludge at small distances from the transducer. Instead, ultrasound efficiency started even to decrease with input power at long distances from the transducer.

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KW - anaerobic digestion

KW - wastewater treatmen

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