The WEF Sustainable Utilities Task Force presents a resource for utility managers seeking examples of succesful sustainability practices

Owls Head Water Pollution Control Plant Improvements to Meet PlaNYC Energy and Greenhouse Gas Reduction Goals

Owls Head Water Pollution Control Plant
Brooklyn, New York

The Owls Head Water Pollution Control Plant (WPCP) is a 120 million gallon per day (MGD)
secondary level treatment facility serving Brooklyn, New York. As part of a city-wide
environmental sustainability program, extensive renovations are being made to minimize fugitive
greenhouse gas emissions, maximize the utilization of biogenic gas produced during the
anaerobic digestion of wastewater sludge, and conserve energy that is consumed during the
wastewater treatment process. Two projects are in progress. One project will provide supply
side improvements to collect digester gas (digas) and produce usable electrical energy and heat
while the second project provides demand side improvements by reducing the energy
requirement associated with process aeration of the activated sludge process.
These projects are being carried out by the New York City Department of Environmental
Protection (DEP) in cooperation with the New York Power Authority (NYPA). When completed,
the projects will have the net result of a 76% reduction in greenhouse gas (GHG) emissions, a
75% reduction in utility-provided electrical consumption, and operating cost savings of over $1
million per year.

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Posted: May 20th, 2011 | Filed under: 500K-1M, Stormwater, Waste Water Treatment | Tags: , , , , , , | No Comments »

Evaluation of GHG Emissions from Biosolids Stabilization and End Utilization Alternatives for the Capital Regional District

Victoria, BC WWTP
Victoria, British Columbia (Canada)

A part of the planning effort for two green field secondary treatment plants that will service the
Core District of Victoria, British Columbia, a modified triple bottom line analysis was conducted
to identify technologies that meet the Province’s goals of cost effective, environmentally
sustainable socially responsible wastewater treatment. One element of this analysis was to
evaluate the impact of a combination of solids stabilization and end use alternatives on the net
greenhouse gas (GHG) emissions of the future utility. If managed appropriately, biosolids
production and utilization is a way to offset emissions from wastewater treatment operations and
accrue carbon credits. Long-term benefits to Capital Regional District (CRD) include compliance
with municipal carbon neutrality goals as well as potential revenue from the development of
carbon trading markets.
Analysis revealed significant carbon credits could be achieved with sludge stabilization by
anaerobic digestion and biosolids utilization in mine reclamation. The greatest reduction in GHG
emissions was achieved when the biogas from digestion was cleaned to natural gas line quality
for introduction to the commercial grid. Co-generation proved to be less beneficial due to the low
GHG intensity of the commercial power source available in the region. Additional carbon credits
are obtained from mine reclamation due to improvement of soil productivity and carbon
sequestration potential. However, it was also found that all of the end uses which capitalized on
either the fertilizer value or energy content of biosolids can provide significant benefits to a
wastewater utility.
Results of this analysis enabled the CRD to make an informed decision about how to produce
and use biosolids to maximize benefits from a sustainability perspective. However, it should be
noted that the findings of this study are contrary to other studies in the published literature. This
is attributed to the low GHG intensity associated with the power utility in the region (0.000022
tonne-CO2e/kWh). This observation suggests that utilities and engineering practitioners should
be conducting site specific inventory analysis and use great care when evaluating literature
reported results to make process decisions.

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Posted: May 20th, 2011 | Filed under: 100K-500K, 500K-1M, Waste Water Treatment | Tags: , , , , , , | No Comments »

Nutrient Removal Treatment Practices Implemented at the City of Los Angeles Upstream Water Reclamation Plants

Donald C. Tillman (DCT) and Los Angeles-Glendale (LAG) Water Reclamation Plants
Los Angeles, California

The principal source of nitrogen compounds in the Los Angeles River is from the City of Los Angeles upstream plants, Donald C. Tillman (DCT) and the Los Angeles-Glendale (LAG) Water Reclamation Plants (WRP’s). These WRP’s were major contributors, with up to 75% of the total dry weather nitrogen load during dry weather periods. In 2007,

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the City has completed a nitrogen removal program to reduce the nitrogen mass discharge from its WRP’s. As part of the process, a comprehensive research effort was undertaken involving bench, pilot and full scale testing to identify the most effective way to upgrade and optimize the existing WRP’s. The combined findings were then used to upgrade WRP’s to “full” BNR plants without derating, carbon and alkalinity addition utilizing the MLE (Modified Ludzack Ettinger) process. This paper will focus on the MLE process design and treatment practices successfully implemented at the City’s WRP’s.

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Posted: May 20th, 2011 | Filed under: 100K-500K, 500K-1M, Stormwater, Waste Water Treatment, Water Treatment | Tags: , , , , | No Comments »

Enhanced Anaerobic Digestion Using Fenton Reagent

Ithaca Area Wastewater Treatment Facility
Ithaca, New York

The results of the Fenton reagent treatment of biosolids at a bench scale and at a full scale
operation, as well as the cost-benefit analysis, are presented here. We compare the results of one
year of full-scale operation of Fenton reagent treatment during 2008 against the normal operation
parameters for the period 2005 – 2007. The treatment of biosolids with Fenton reagent was tested
in a full-scale reactor at the Ithaca Area Wastewater Treatment Facility, IAWTF. The Fenton
reagent treated biosolids were returned back to an anaerobic digester for additional digestion.
The most relevant results were the reduction in the amount of final residual biosolids for disposal
(11.5% reduction), the increase in the percent solids content of the final residual biosolids (7.5%
higher), and a higher energy cogeneration output (13.0% higher specific biogas production, &
13.0% higher heat output). The net economic benefit was $78,000.00 per year.

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Posted: May 20th, 2011 | Filed under: 100K-500K, 500K-1M, Stormwater, Waste Water Treatment, Water Treatment | Tags: , , , , , | No Comments »

Managing Innovation: Optimizing Resource Allocation Using New York City’s Innovative Technology Prioritization Tool

New York City Department of Environmental Protection (DEP)
New York City, New York

Long term experience with the identification, evaluation, and implementation of innovative
technologies has shown that a structured framework in the decision-making process is crucial to
the success of the overall effort. A framework for identification, evaluation, and implementation
of innovative technologies that is applicable to a wide range of wastewater treatment
technologies was developed by the New York City Department of Environmental Protection
(DEP) Applied Research Program. By using the Innovative Technology Prioritization (ITEP)
framework for screening and prioritizing innovative technologies for further development and/or
large-scale testing, the City was able to focus Research and Development (R&D) efforts in
technologies that were viable within the current constraints faced by the City, saving in excess of
$1.5 million in R&D funding.

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Posted: May 20th, 2011 | Filed under: >1M, 100K-500K, 500K-1M, Stormwater, Waste Water Treatment, Water Treatment | Tags: , , , , , | No Comments »

Cashing in on Public Involvement Investment: Louisville Achieves Compliance at Half the Cost

Louisville and Jefferson County Metropolitan Sewer District (MSD)
Louisville, Kentucky

In response to a Consent Decree entered into Federal Court in August of 2005, the Louisville and
Jefferson County Metropolitan Sewer District (MSD) developed an Integrated Overflow
Abatement Plan (IOAP) to control the community’s combined sewer overflows (CSOs) and
sanitary sewer overflows (SSOs). The Consent Decree contained a provision for stakeholders to
participate in the development and implementation of the Long-Term Control Plan and the
Sanitary Sewer Discharge Plan.
Recognizing that the development of the IOAP Program would represent a major investment for
the community, MSD expanded the influence of the stakeholder group to assist in developing
community support for the investments necessary to comply with the Consent Decree

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Posted: May 20th, 2011 | Filed under: 500K-1M, Sanitary Sewer, Stormwater, Water Treatment | Tags: , , , , , , | No Comments »

Integrated Approach to Secondary Clarifier Improvements Based on CFD Modeling and Proven Best Practices

Downriver Wastewater Treatment Facility
Wayne, Michigan

The need for physical, mechanical and process

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upgrade of six 165-foot diameter peripheral feed
secondary clarifiers at the Wayne County, Michigan Downriver Wastewater Treatment Facility (WWTF)
was identified as part of a capital improvement program. Improved efficiency was also needed to provide
reliable operation for entire range of design conditions. An evaluation of the existing final clarifier
process was performed to develop the recommended plan for improvements based on site specific testing,
mathematical modeling and consideration of proven best practices. The proposed improvements were
recommended based on the modeling with consideration of proven practices and included a new orifice based
influent peripheral feed channel, new effluent channel and weirs, and manifold type hydraulic
suction mechanisms. Performance testing after installation confirmed the process design parameters were
achieved by the upgraded secondary clarifiers.

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Posted: May 20th, 2011 | Filed under: 100K-500K, 500K-1M, Waste Water Treatment, Water Treatment | Tags: , , , , , | No Comments »


Northern California Utility
Northern California


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digestion is one of the tools private and public entities are considering to use or already using to manage and obtain renewable energy with various feedstocks. Performance potential of anaerobic digestion is dependent on the design and operation, however there are ways to improve and make anaerobic technologies work for our benefit. This paper covers the methodologies and technologies available in US and Europe, and focus on a California Utility’s efforts as an example of a multi-pronged approach to renewable energy recovery. Additives that have undergone a relatively thorough scientific evaluation as documented in peer-reviewed publications and research reports were then shortlisted to ascertain the technical and economic feasibility assessment at two host sites representing a municipal sewage sludge digestion facility and a dairy manure digestion facility. DSM/Biopract products that consist of enzymes and macro- and micro-nutrients were selected for this feasibility assessment. The feasibility assessment results showed potential for enhanced biogas production by using additives depending on the digester feed. Where it is possible to add other feedstocks such as food waste, green waste or high-energy crops to further enhance biogas production, a greater benefit and larger energy recovery potential could be realized from additive use.

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Posted: May 20th, 2011 | Filed under: 100K-500K, 500K-1M, Waste Water Treatment, Water Treatment | Tags: , , , , , , , , , , | No Comments »

Green Roof Technology as a Stormwater Best Management Practice

Pittsburgh, Pennsylvania

Many older cities have antiquated sewer systems that are unable to accommodate increasing amounts of impervious surface runoff from urban expansion. Excess stormwater runoff often causes systems to become overwhelmed resulting in untreated raw sewage spills into lakes, streams, and rivers. Installation of

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green roofs addresses this problem by using plants to cover the roofs of buildings; providing runoff control as well as lowering the amount of radiant heat absorbed by the roof. Green layered roofing systems absorb water that otherwise would have become runoff and entered the sewer system, reduce runoff flow rates, delay peak flows and, possibly, improve the water quality of runoff. Quantitative information is presented on the long term performance of two different green roof technologies in terms of initial runoff retardation, maximum peak flow retardation, and quantity of flow as compared to companion control roofs located in the Pittsburgh, Pennsylvania area.

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Posted: May 20th, 2011 | Filed under: >1M, <50K, 100K-500K, 500K-1M, 50k-100k, Stormwater, Waste Water Treatment, Water Treatment | Tags: , , , , , , , , , | No Comments »


Pima County Regional Wastewater Reclamation Department
Pima County, Arizona

Pima County

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Regional Wastewater Reclamation Department (PCRWRD) manages a sewer conveyance system that includes over 3,300 miles of sewer pipes, 66,000 manholes and 29 active lift stations. PCRWRD operates two major wastewater treatment facilities within the Tucson metropolitan area, the Roger Road Wastewater Treatment Plant (Roger Road) and the Ina Road Water Pollution Control Facility (Ina Road). Odor abatement and control across the entire system is a major issue facing the department as many odiferous compounds, primarily hydrogen sulfide, are generated from the conveyance and treatment of sewage. PCRWRD has initiated a System-wide Odor Control Planning effort to develop a holistic, fiscally sound and implementable Plan to mitigate county wide odor problems. The planning effort was structured to identify both near term and long term solutions for the odor emissions. The near term solutions are those that can be readily implemented, either by staff or by Job Order Contract. The near term solutions are intended to give maximum immediate relief from nuisance odor emissions at minimum cost. The long term solutions are those that require significant capital investment, integration and coordination with other long term facility expansions or improvements and which require significant design lead time and construction procurement activities. The odor emissions from the Roger Road WWTP have lead to numerous odor complaints from residents and businesses in the area surrounding the plant for quite some time. Due to the severity of the nuisance odor emissions, PCRWRD determined that a “Quick Fix” for odor emissions from the Roger Road WWTP was a must. Therefore, early efforts in the System-wide Odor Control Plan focused on measures to identify and mitigate the most sever sources of odor emissions from the Roger Road WWTP. This paper will focus on aspects of developing a “Quick Fix” for Odor Control at the RR WWTP, including the following: ● Development of baseline odor sources and emission characterizations ● Development of a “Quick Fix” odor control strategy and an implementation plan ● Cooperative effort between PCRWRD, Consultant Team and JOC Contractor to implement the “Quick Fix” plan ● Results of the “Quick Fix” Odor Control at the PCRWRD Roger Road WWTP

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Posted: May 3rd, 2011 | Filed under: 500K-1M, Waste Water Treatment | Tags: , , , | No Comments »