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Baltimore Highlands, MD, United States

Lindow N.L.,Biohabitats Inc.
ASABE - TMDL 2010: Watershed Management to Improve Water Quality | Year: 2010

Montgomery County is a municipal separate storm sewer system (MS4) community in Maryland, and thereby a regulating entity for the new Maryland Department of the Environment regulation of environmental site design (ESD) to the maximum extent practicable. The County is also a regulated community under the Clean Water Act and as set forth in their national pollutant discharge elimination system (NPDES) permit and total maximum daily load (TMDL) requirements, which include waste load allocations for nitrogen, phosphorus, total suspended sediment, bacteria, and trash within the different watersheds of the County. In order to track their ongoing effort to treat runoff from impervious areas and reduce pollutants in their surface waterways, the County applied the Watershed Treatment Model (WTM) to inventory the baseline status and forecast the results of implementing watershed restoration to the maximum extent practicable. Initial results of tracking bacterial loads in Rock Creek are presented. The WTM provided baseline bacterial load results within ten percent of direct surface water measurements. The assumptions being tested by the model include the ability of Montgomery County Capital Improvement Projects, ESD practices, habitat restoration, and programmatic practices to meet TMDL goals and adequately treat runoff from impervious cover, The assumption is that ESD practices will reduce necessary stormwater infrastructure costs by decentralizing management using more sustainable practices with lower life-cycle costs. We also explore how to target bacteria in the watershed and the bacteria removal efficiencies of the practices tested. For bacteria TMDLs, programmatic practices such as pet waste education and enforcement may be the most cost effective best management practices. Source

Jones P.S.,Biohabitats Inc. | Jones P.S.,University of Maryland University College | Davis A.P.,University of Maryland University College
Journal of Environmental Engineering (United States) | Year: 2013

On-site sequestration and accumulation of heavy metals in bioretention cells introduces the potential for short- and long-term management concerns regarding the metals' environmental availability, human health impacts, and implications for maintenance practices. Media samples from a 4-year-old bioretention cell were collected across the cell surface and to a depth of 90 cm to assess the spatial distribution of accumulated lead, copper, and zinc in the media. Analyses consisted of total metal, a five-step sequential extraction, bioavailable lead, and media pH and organic matter content. Metal concentrations in the media have increased substantially over the original levels but are well below regulatory cleanup thresholds. Metals are strongly bound to bioretention media and are largely immobile. Lead bioavailability is comparable to generic soil estimates. Most metal accumulation is near the inflow point in the top 3-12 cm of media. Based on trends observed after 4 years of operation, many years of capacity are estimated to remain in the cell with respect to metals. Regulatory cleanup thresholds are likely to be first reached at a localized hotspot near the inflow point, although routine maintenance actions may be able to delay attainment of such thresholds indefinitely. © 2013 American Society of Civil Engineers. Source

Lyon J.,Biohabitats Inc. | Lyon J.,Johns Hopkins University
World Environmental and Water Resources Congress 2013: Showcasing the Future - Proceedings of the 2013 Congress | Year: 2013

This paper discusses the need and methods associated with sustainable water resources management through potable water augmentation. Current climatic and anthropogenic conditions necessitate increased sustainability in water resources management. Access to drinking water is scarce in many parts of the world already. In other areas, potable water is inefficiently and wastefully supplied and utilized. Associated costs for traditional potable water and wastewater services can be used in determining the feasibility for potential supplementation methods. However, a truly comprehensive cost-benefit analysis would include the valuation of intangible socioeconomic factors and natural capital and would remove subsidies from the equation. Rainwater harvesting, greywater reuse, and beneficial wastewater reuse can be excellent tools for reducing potable demand and wastewater flows, while ultimately moving further away from a linear-use model of water consumption to a more cyclical-use model. © 2013 American Society of Civil Engineers. Source

Potts T.,University of Arkansas | Du J.,University of Arkansas | Paul M.,University of Arkansas | May P.,Biohabitats Inc. | And 2 more authors.
Environmental Progress and Sustainable Energy | Year: 2012

This study ascertained the technical potential of producing biofuel from a naturally occurring macroalgae. The algae examined grow in Jamaica Bay, New York City, on water containing nitrates, phosphates, and carbon dioxide that comes from the atmosphere. The process consisted of manual and mechanical harvesting, drying, grinding, and subjecting the algal matter to acid hydrolysis to extract carbohydrates to form an algal sugar solution. Fermentation of that solution to butanol was performed with butanol ultimately removed by distillation. An average of 15.2 g/L of reducing sugars was extracted in the hydrolysate showing that macroalgae (Ulva lactuca) have significant usable carbohydrates after hydrolysis. It was found necessary to remove the excess solids from the hydrolysate prior to fermentation, as the productivity fell by 75% if this was not done. With the bacterial strains (Clostridium beijerinckii and C. saccharoperbutylacetonicum) and the algal sugar solutions used, an acetone butanol ethanol (ABE) fermentation was used to make butanol. The butanol concentration in the fermentation broth reached about 4 g/L, which is close to the theoretical value for the sugar concentration obtained, and compares well (when adjusted for sugar concentration in the media) with values reported in the literature for other systems. The recovery of reducing sugars in the media during the pilot study was 0.29 g butanol/g sugar. © 2011 American Institute of Chemical Engineers. Source

Daoust R.,Arcadis | Doss T.,Biohabitats Inc. | Gorman M.,Northeast Midwest Institute | Harwell M.,U.S. Environmental Protection Agency | Ulrich C.,LERS pro tem
Sapiens | Year: 2014

In 2004, a group of large-scale ecosystem restoration practitioners across the United States convened to start the process of sharing restoration science, management, and best practices under the auspices of a traditional conference umbrella. This forum allowed scientists and decision makers to interact in a new type of setting, with science being presented from a perspective that informed ecosystem restoration decisions, and decision makers articulating their decision needs in a manner that informed the types of science questions that needed to be addressed. From that beginning, a core ecosystem restoration practitioner group has formed a community of practice that continues to build and maintain momentum for this type of ecosystem restoration engagement. In the fall of 2013, this community of practice became permanently organized as the Large-scale Ecosystem Restoration Section within the Society for Ecological Restoration. Over the past decade, this community has evaluated and expanded upon ecosystem restoration themes ranging from defining and measuring success, adaptive management, adaptive governance, and linking science with management decision-making. Current and future themes include novel ecosystems, ecosystem goods and services, urban ecosystem restoration, and climate change and ecosystem resilience. © Licence Creative Commons. Source

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