Energy recovery potential of anaerobic digestion of excess sludge from high-rate activated sludge systems co-treating municipal wastewater and food waste

Huseyin Guven*, Mustafa Evren Ersahin, Recep Kaan Dereli, Hale Ozgun, Isa Isik, Izzet Ozturk

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

Excess sludge from a pilot-scale high-rate activated sludge (HRAS) system was digested anaerobically under mesophilic conditions. The pilot-scale HRAS system was initially fed with only wastewater and following that, fed with wastewater together with food waste. Impact of food waste inclusion on anaerobic digestion performance was investigated. Thereafter, a feasibility study was carried out using the performance data obtained from the experimental studies. The results showed that digestion of HRAS sludge could be a preferable option unless excellent biomass-liquid separation could be employed and mineralization of influent chemical oxygen demand (COD) could be suppressed. Additionally, co-treatment of wastewater and food waste increased the methane yield and improved the energy balance of the wastewater treatment plants (WWTPs). Thus, WWTPs can have a surplus in the energy budget.

Original languageEnglish
Pages (from-to)1027-1036
Number of pages10
JournalEnergy
Volume172
DOIs
Publication statusPublished - 1 Apr 2019

Bibliographical note

Publisher Copyright:
© 2019 Elsevier Ltd

Funding

This study was conducted as part of a SAN-TEZ project ( 0534.STZ.2013-2 ), which was supported by Ministry of Industry and Technology of Turkey, and Istanbul Environment Management Industry and Trade Company (ISTAC) . Appendix A This study was conducted as part of a SAN-TEZ project (0534.STZ.2013-2), which was supported by Ministry of Industry and Technology of Turkey, and Istanbul Environment Management Industry and Trade Company (ISTAC).

FundersFunder number
ISTAC
Istanbul Environment Management Industry and Trade Company
Ministry of Industry and Technology of Turkey
Bilim, Sanayi ve Teknoloji Bakanliği0534.STZ.2013-2

    Keywords

    • Anaerobic digestion
    • Co-treatment
    • COD balance
    • Energy surplus
    • Food waste
    • High-rate activated sludge system

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