pH control during denitrificatiln

摘要

The effectiveness of bioremediation in the environment is governed by site-specific conditions such as the presence or absence of an appropriate lectron acceptor, temperature, or pH (1-3). Microbial degradation of organic contaminants in ground water or soils may impact environmental conditions such as pH, and changing pH conditons may impact microbial processes. Neutral or slightly alkaline pH is generally considered optimal for bacterial growth. Because the effectiveness of in situ bioremediation depends on a microenvironment that is conducive to biological degradation, it is advantageous to alter the micro-environment to enhance biological activity when conditions are less than optimal. In this study, the use of encapsulated buffers to alter the pH during denitrification is investigated. The initial approach taken in this research involves evaluation the effectiveness of the encapsulated buffer in controlling the pH in a denitrifying suspended-growth batch system, coupled with modeling studies describing the batch system and a one-dimensional bioremediation system.