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Pilot-Scale Evaluation of ANITA Mox for Centrate Nitrogen Removal at the Joint Water Pollution Control Plant

The Sanitation Districts of Los Angeles County (Districts) evaluated two variants of Kruger/Veolia's ANITA Mox process for removing centrate nitrogen at the Joint Water Pollution Control Plant (JWPCP) in Carson, California. One variant was based on the Moving Bed Biofilm Reactor (MBBR) technology, while the other was based on the Integrated Fixed-Film Activated Sludge (IFAS) technology. Two different centrate streams ("Pre-DAF" and "Post-DAF") were tested as feed to the MBBR pilot; one ("Pre-DAF") was tested with the IFAS pilot. Due to dilution by other process water, both centrate streams contained lower concentration of NH4 than typical centrate. Median feed NH4 concentrations during this study were 634 mgN/L (Pre-DAF) and 469 mgN/L (Post-DAF).

An Alternative Mathematical Model for Oxygen Transfer Evaluation in Clean Water

Energy consumption from aeration system is a biggest part of the total energy cost in wastewater treatment plant and account for as much as 60% of the energy consumption for the activated sludge process. Therefore, it is very important to know how effective the aeration system and significant attention has been paid to development and upgrade of standard method for quantifying oxygen transfer efficiency of the aeration system. In order to evaluate the performance of different types of aeration systems, the American Society of Civil Engineers (ASCE) and US EPA jointly developed a standard for the measurement of oxygen transfer in Clean Water in 1984. The Standard was subsequently improved, updated, and republished in 1991 and 2006. The focus of this paper has been to develop an alternative model which includes more parameters than the standard method. A new model would probably be a more accurate description of the aeration process and give more reliable oxygen transfer performance evaluation results.

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