Effect of temperature elevation from 55 °c to 65 c on the performance of a thermophilic uasb reactor and characteristics of methanogenic granular sludge

Shigeki Uemura, I. Cheng Tseng, Hideki Harada

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

A thermophilic (55°C) upflow anaerobic sludge blanket (UASB) reactor was operated by feeding a wastewater containing sucrose at a fixed total organic carbon (TOC) loading rate of 18 kg TOC m-3d-1 for a period of 3 years. After this operation period, the reactor temperature was shifted from 55°Cto65°C to investigate the effect of this temperature elevation both on reactor performance and on the characteristics of thermophilic granular sludge. A sharp increase in the effluent TOC occurred after the temperature shift, leading to a deterioration of TOC removal from 90% to 65%. Methane production from the reactor gradually increased from 100 to 130 1 d-1 during the first 40 days of 65°C operation, and then drastically decreased to 40-50 1 d-1. This process failure was attributed to the disintegration of the granular sludge during 65°C operation. Microbial characteristics of the granular sludge were evaluated before and after the temperature shift. The acetate-utilizing and propionate-utilizing methanogenic activities remained unchanged after the temperature shift while the H2-utilizing methanogenic activity in 65 °C operation was slightly higher than that for 55°C operation. No remarkable change was found in the numbers of acetateutilizing, H2-utilizing and propionate-utilizing groups in both temperature periods.

Original languageEnglish
Pages (from-to)987-994
Number of pages8
JournalEnvironmental Technology (United Kingdom)
Volume16
Issue number10
DOIs
Publication statusPublished - 1995 Jan 1
Externally publishedYes

Keywords

  • Granular sludge
  • Methanogenic activity
  • Temperature elevation
  • Thermophilic UASB

ASJC Scopus subject areas

  • Environmental Chemistry
  • Water Science and Technology
  • Waste Management and Disposal

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