Biotreatment Management Procedure

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Figure 4 shows the major components of the decision-making process. The first step is to identify the treatment situation and the applicable bioremediation technology. The next step is to evaluate the biodegradative capability of the mixed culture organisms to degrade the target waste. For aerobic systems, this is best achieved by respirometry, or oxygen uptake

Figure 4. Flow chart of a patented procedure for managing biotreatment and bioremediation systems

measurements of the biomass degrading the waste. These measurements are translated via quantitative analysis into parameters that characterize the cell’s biodegradative ability.

  This evaluation step also includes the evaluation of surfactants that might have to be introduced to eliminate solubility problems and enhance biodegradation rates.
  After biokinetic evaluation, the next step is design of the system. By using the values of the biokinetic parameters and a process control model, it is possible to generate a series of curves to predict process performance under a variety of treatment conditions. For example, in activated sludge systems treating toxic or hazardous wastes, generation of dilute-out curves and critical point curves determines the bioreactor’s performance and operating range for a variety of influent waste conditions and reactor detention times. This information is used to size the reactors and identify recycling requirements.
  After design, the next step in the procedure is process operation. Figure 4 shows an additional biokinetic evaluation step and an operation modification step. This is incorporated because treatment or remediation conditions can change. Waste concentration or quality may vary, and given the biodegradation characteristics of toxic or hazardous wastes, and the need to maintain process performance, it is essential to be proactive in operation. By periodically evaluating the biokinetic constants during remediation or waste treatment, one can detect changes in biological parameters that reflect changes in the biodegradative capacity of the system. Such updated values of the biokinetic constants are inserted into the process model for additional analysis. This information is used in concert with any changes in treatment conditions, such as contaminant concentrations in the waste stream, and inserted into the model to determine if changes are required in the engineering controls to maintain process performance and to continue to meet treatment or cleanup standards.
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