Saturday, September 29, 2012
Here is a great new M.B.S. (Masters in Building Science) thesis titled Greywater Systems in Urban Environments by Chase Jamison Blood, at the University of Southern California that has a little something in it for everyone, from the green building business, public health and safety, to urban water economists.
This thesis examines the feasibility of greywater systems under various conditions in order to understand optimal circumstances for greywater system installation and, in turn, site sustainability. The study begins by analyzing historical and modern approaches to greywater such that successful methods can be implemented into present day sustainable design. Current issues pertaining to greywater such as health concerns and overcoming public opposition to recycling water are discussed in order to better design integrated greywater systems that will not be encountered with a negative perspective. Furthermore, sustainability programs such as LEED and Sustainable Sites are examined for implementation of water sustainable site design and if greywater systems are being incentivized by these programs. Water use is dissected into commercial and residential use in order to typify sites and identify consumption patterns in order to generalize a site's feasibility for greywater system implementation. This data is used to establish an algorithm which quantifies a site's feasibility for a greywater system in the form of a payback period. Other variables include the amount of rainfall and precipitation, utility data such as water, sewage, and electric rates, and typical user consumption. Four different system types--Membrane Bioreactor, Rotary Biocontactor, Alternating Intermittent Recirculating Reactor, and Brac--are examined and implemented into the modeling process to understand how system demands, based on the given variables, impact system feasibility. Trends and relationships are identified which establish general patterns in model output, including quantified metrics of greywater system variables. Embedded costs and benefits to current infrastructure are discussed to properly understand the true price of the utilities consumed to provide for daily water consumption.
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Waste is a design flaw.
~ Kate Krebs, Director of Sustainable Resources at The Climate Group
Posted by Todd Jarvis at 1:04 PM