Performance of an Anaerobic Fluidized Bed Bioreactor (AnFBR) for digestion of municipal biosolids and bioethanol wastes

Mehran Andalib, Elsayed Elbeshbishy, Hisham Hafez, Nizar Mustafa, George Nakhla, Jesse Zhu

Research output: Chapter in Book/Conference proceedingConference contributionpeer-review

Abstract

The primary objective of this work was to investigate the treatability of very high suspended solids with different biodegradable particulate fractions, thin stillage (a by-product from the corn ethanol industry) as well as primary sludge, using an anaerobic fluidized bed bioreactor (AnFBR) employing zeolite with average diameter of (dm) of 425-610 μm and specific surface area (SSA) of 26.5 m2/g as the carrier media. Due to the long-term impact of accumulation of inert suspended solids in the AnFBR and potential toxicity leading to failure, treatability of high suspended-solid streams can be very challenging. Despite the very high strength of thin stillage and primary sludge with chemical oxygen demand of 130,000 mg TCOD/L and 42,000 mg TCOD/L respectively and suspended solids of 47,000 mg TSS/L and 34,000 mg TSS/L, the AnFBR showed up to 88% and 82% TCOD and 78% and 82% TSS removal efficiencies from thin stillage and primary sludge respectively at very high organic and solids loading rates (OLR and SLR) of 29 kg COD/m3.d and 9.5 kg COD/m3.d and 10.5 kg TSS/m3.d and 10.3 kg TSS/m3.d respectively at hydraulic retention time (HRT) of 3.5 and 4 days. Maximum methane production yields of up to 40 LCH4/LThin stillage and 9.7 LCH4/LPS were achieved for treating thin stillage and primary sludge respectively corresponding to biogas production rate per reactor volume of 15.8 Lgas/Lreactor.d and 1.22 L CH4/Lreactor.d.

Original languageEnglish
Title of host publication86th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2013
PublisherWater Environment Federation
Pages5297-5318
Number of pages22
ISBN (Electronic)9781510870444
DOIs
Publication statusPublished - 2013
Externally publishedYes
Event86th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2013 - Chicago, United States
Duration: 5 Oct 20139 Oct 2013

Publication series

Name86th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2013
Volume8

Conference

Conference86th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2013
Country/TerritoryUnited States
CityChicago
Period5/10/139/10/13

Keywords

  • Biosolids
  • Fluidized bed bioreactor
  • High rate anaerobic digester
  • Primary sludge
  • Thin stillage

ASJC Scopus subject areas

  • Water Science and Technology
  • Ecological Modelling
  • Environmental Chemistry
  • Pollution
  • Waste Management and Disposal

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