Session Presenter: Dr. Sara Heger, University of Minnesota
Title: TSS – Sources, Impacts and Solutions
Content: Total suspended solids (TSS) is found in all wastewater in varying amounts. The type of facility and activities influence the levels in the raw wastewater. This presentation will provide an overview of methods of quantifying solids in wastewater and typical levels in raw wastewater. The sizing of our primary treatment in septic tanks and the use of screens/filters will be discussed. The reduction of TSS in secondary treatment units such as aerobic units and media filters is another variable impacting TSS. Microplastics from laundry wastewater will be focused on as potential non-biodegradable solid in our wastewater If the levels are elevated it can impact the clogging of filters/screens, media filters, and soil treatment system. This presentation will discuss use, design, and management options to reduce the impacts of TSS on system performance and longevity.
Title: Changing Water Usage
Content: This presentation will focus on a study funded by the Water Research Foundation evaluating water use from over 23 utilities and over 1,000 homes showing a 23% reduction in water use since 1999. The primary sources for the reduction will be discussed along with implications with increased concentrations. Septic system design and operation considerations will be highlighted.
Title: Compaction - the Enemy of System Longevity
Content: Humans along with all our activities cause widespread soil compaction. Compaction constrains oxygen (O2) movement in the soil and shifts soil toward anaerobic conditions. Less O2 diffusion into the soil leads to a chemically reducing soil environment. Compaction leads to smaller pore spaces and slower infiltration rates. This presentation will discuss the causes of compaction including wet soils, material handling and the weight of vehicles/equipment, pedestrians, and animals. It will then focus on avoidance methods and potential solutions for sites have been compacted.