Chapters
- Abstract
- Wastewater, Sampling Preservation, and Anaylsis Methods
- Wastewater Fractionation
- Biological Kinetic Parameter Estimation
- Summary
- List of Selected Symbols Used in this Report
- Literature Cited
- Credits
Biological Phosphorus Removal Design
- Characterization for Evaluation
- Potential Test
- Demonstration of Intermittent On/Off Aeration
- Biological Nutrient Removal Theory and Design
- Design of Biological Nutrient Removal Processes
- ENBIR computer-design program
Research Report 174
August 1997
Wastewater Characterization for Evaluation of Biological Phosphorus Removal
by Jae Kwang Park, Jenchie Wang,* and Gerald Novotny**Abstract
Many treatment plants have been designed or upgraded to remove phosphorus by the addition of chemicals. Problems associated with chemical precipitation include high operating costs, increased sludge production, sludge with poor settling and dewatering characteristics, and depressed pH. Biological phosphorus removal (BPR) systems can offer the benefits of reduced sludge production, improved sludge settleability and dewatering characteristics, reduced oxygen requirements, and reduced process alkalinity requirements. However, pilot-testing and traditional methods for kinetic parameter determination are complex and time consuming, which can make the evaluation of BPR processes too costly for smaller treatment facilities.
A simple COD fractionation method was developed to determine the fraction of readily biodegradable soluble COD, which is vital for biological phosphorus removal design. Simple methods are proposed to determine Y, kd,
max, and Ks, which are important for BPR process design. These kinetic parameters and the detailed fractionation results of raw wastewater COD, nitrogen, and phosphorus can be used in biological nutrient removal process design computer programs such as ENBIR, which is based on the model developed by Ekama et al. (1984) and is a public domain computer program, or BIOSIMTM, a menu-driven personal computer-based simulation program that solves the equations of the International Association on Water Pollution Research and Control (IAWPRC, now International Association on Water Quality, IAWQ) task group model for activated sludge systems extended for enhanced BPR (EnviroSim Associates 1993). These models can be used to determine the process volume and to evaluate the effect of COD loading, biomass concentration, and sludge age on the nutrient removal efficiency.
The use of a computer package along with the wastewater characterization technique specific for BPR and kinetic parameter determination will allow small wastewater treatment plants or industries to evaluate the feasibility of biological phosphorus removal of their wastewater with minimum cost.
Contents
*Department of Civil and Environmental Engineering, University of Wisconsin-Madison, Madison, WI.
**DNR Bureau of Watershed Management, Madison.
Credits
More information on this topic: Gerry Novotny
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