A study of aerobic digester performance with the use of methanol for biological nutrient removal in a full-scale sequencing batch reactor. Issue 6 (1st November 2002)

• Record Type: Journal Article
• Authors: Koh, Jeffrey J.H; Mavinic, Donald S; Oldham, William K; Meisen, Axel; Nuttall, Steven J
• Is Part Of: Journal of environmental engineering and science. Volume 1:Issue 6(2002)
• Page Start: 439
• Page End: 449
• Publication Date: 2002-11-01
• Subjects: environment; Environmental engineering -- Periodicals; Sanitary engineering -- Periodicals; Environmental engineering -- Canada -- Periodicals; Environnement, Technique de l' -- Périodiques; Technique sanitaire -- Périodiques; Environnement, Technique de l' -- Canada -- Périodiques; Environmental engineering; Sanitary engineering; Canada; Electronic journals; Computer network resources; Periodicals; 628.05
• DOI: 10.1139/s02-036
• Languages: English
• ISSNs: 1496-2551

Abstract

Abstract : The primary goal of this research was to determine whether the use of methanol in a full-scale sequencing batch reactor (SBR) affected the subsequent aerobic sludge digester performance. The methanol injection into an experimental SBR resulted in a significant increase in the solids level in the SBR, increased wasting into the digesters, and a lower sludge age. When the methanol dosage in the SBR was 81 L/d, the dissolved oxygen level in the subsequent aerobic digesters became inadequate for proper digestion. The net result was a drop in solids reduction efficiency. However, the methanol injection appeared to have no effect on the dewaterability of the digested sludge, as samples from the experimental and control units had very similar capillary suction time (CST) results. It was found that the dewaterability was affected not only by the total suspended solids concentration of the digested sludge, but even more by the temperature of the digested sludge, through a change in filtrate viscosity. Key words : aerobic digestion, biological nutrient removal, denitrification, methanol, sludge dewaterability.