Optimization of On-site Advanced Wastewater Treatment System to reduce nitrogen and organic pollutants

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In rural areas with low population densities and/or without access to centralized sewer systems, wastewater is most often treated in close proximity to the source of its generation. Most residents in these areas depend on conventional onsite septic systems where 30 to 50 % of the wastewater treatment is performed in the septic tank and an additional 50 to 70 % is performed in the soil. In many cases, however, implementation of a conventional septic system is limited due to site (i.e. elevation) and soil type / conditions. Regulations around treatment and effluent requirements vary depending on where the effluent. Decentralized advanced wastewater treatment systems with integrated fixed film processes are a reliable solution in these circumstances due to their ability to effectively and efficiently treat wastewater. This research project will focus on an innovative Advanced Wastewater Treatment (AWT) system for residential and commercial applications. The AWT system is an onsite system that combines gas infusion into liquid technology with a fixed film process to reduce organic matter, suspended solids, and nitrogen from wastewater. The primary objective of this applied research project is to optimize the current design in terms of flow, media type and volume, and aeration for enhanced reduction of nitrogen and organic compounds while minimizing cost. In order to meet these objectives two AWT systems will be run in parallel, each one utilizing a different media source. In addition some system modifications (e.g. additional recirculation) may be required to improve the overall nitrogen removal efficiency. This optimization study will be performed over a 6 month study period to (1) evaluate the current system, (2) incorporate modifications as needed, (3) optimize and evaluate each of the modified systems for treatment capabilities. The results of this applied research will improve knowledge of the current system, enhance the product, and increase technical credibility.