The project discussed below is part of a critical inter-regional transportation corridor located in central Minnesota. The roadway currently exists as a 2-lane trunk highway and is being reconstructed into a 4-lane, divided highway with associated service roads. The project is a major land use feature in the watershed of several recreational lakes as well as watersheds for multiple wetland...

The Metropolitan Sewer District of Greater Cincinnati (MSDGC) has created a Wet Weather Operations Division to operate and maintain wet weather assets constructed under its Wet Weather Improvement Plan (WWIP). Specifically, the assets include high-rate treatment facilities, real-time control facilities, and green infrastructure installations. Since these assets are built to operate under wet...

The City of Madison, Wisconsin is a Phase I stormwater permitted municipality. The MS4 permit now includes a numeric target for annual total phosphorus load reductions from stormwater based on the Rock River TMDL (WDNR, 2011). On a city-wide basis, the targeted total phosphorus (TP) reduction is approximately 50% from current conditions. The addition TP reductions will require technology beyond...

The City of Madison, Wisconsin is a Phase I stormwater permitted municipality. The MS4 permit now includes a numeric target for annual total phosphorus load reductions from stormwater based on the Rock River TMDL (WDNR, 2011). On a city-wide basis, the targeted total phosphorus (TP) reduction is approximately 50% from current conditions. The addition TP reductions will require technology beyond...

A series of energy optimization options (EOOs) were identified for the Ejby Molle WWTP through the analysis of historical operational data, the use of an advanced mass/energy balance simulation tool, and the adoption of a collaborative workshop-based approach in identifying and evaluating alternatives. This biological nutrient removal facility is located in Odense, Denmark, and has a treatment...

Despite documented I/I reductions in the collection system1, the dynamic hydraulic model for the Trinity River Authority of Texas' (TRA) Central Regional Wastewater System (CRWS) predicted an increase in the Q2-HR PEAK/QADF ratio at the WWTP from 2.5 to 3.30.2 The 2.5 ratio historical value was known to be artificially low, the result of unintended in-line storage created by hydraulic bottlenecks...

This paper discusses how the colloidal fraction of the soluble BOD5, was abated through enhanced coagulation (a process that is most often applied in drinking water treatment) at the pilot-scale.

Enforcement of increasingly stringent effluent limits, and application of more sophisticated treatment processes for reduction of chemicals of potential concern, increases the energy consumed in municipal wastewater treatment processes. Energy consumption factors (ECFs) have been developed for wastewater treatment plant configurations based on the quantity of electrical energy used per cubic meter...

Shortcut nitrogen removal (SNR) processes such as partial nitritation – Anammox (deammonification) or nitritation-denitritation (nitrite-shunt) reduce the oxygen consumption, lower or even remove the carbon demand and produce less sludge. For SNR, the main challenge is the out-competition of Nitrite Oxidizing Bacteria (NOB) for nitrite during aerobic conditions. This paper...

The secondary effluent from the activated sludge plants that are operated at low solids retention times to achieve BOD and TSS removal are currently considering the need to either upgrade the main treatment facility or to add tertiary facilities to achieve a more complete nutrient removal for various end use driven reasons. Especially in the cases where a high quality product water is needed in...

 

 

Water supply and sanitation (WSS) service delivery in developing countries has been failing despite significant increases in resources that have been expended on WSS infrastructure investments to achieve the access focused MDGs. 2.1 billion people worldwide have gained access to improved sanitation since 1990 and 91 percent of the global population is now using an improved drinking water source....

CoMag® is a ballasted flocculation sedimentation process designed for different applications including tertiary phosphorus removal. The Town of Maynard selected the process to achieve an effluent phosphorus limit of less than 0.1 mg/1 with the understanding that the future reductions in the permitted discharge could be implemented. Brown and Caldwell designed the process in concert...

The paper presents results from years-long plant operation or the performance testing at three complete nitrogen removal Biological Active Filters (BAFs) plants in the U.S.A. which was conducted to investigate the ability of BAF processes with extremely short hydraulic retention times (HRTs) in cold climates (≤10 °C) to remove ammonia and total nitrogen (TN), the effect of process designs...

We are in a period of tremendous change in human history which represents unequalled opportunities for improved decision making at both organizational and individual levels. Forces influence the outcome of events every day in ways which affect not only local people, opportunity, and resources, but also the water and wastewater treatment industries. In these changing and uncertain times, practical...

In 2013 the water sector launched the Utility of the Future1 initiative, an industry-wide, triple bottom-line effort premised on embracing innovation and technology, improving performance, lowering cost and increasing revenue. DC Water on its path to embracing the challenge of creating and sustaining our enterprise as a utility of the future...

Industrial facilities can be faced with limited water supply and/ or effluent limits on the salt concentration. For these facilities it is worthwhile to review the steps to reduce the discharge flow and develop a master plan to achieve zero discharge eventually. This paper describes the sequential steps in such a study and presents an example of such a study in a petroleum refinery.

This paper presents the alternatives evaluated for a zero discharge system at a petrochemical plant. The paper presents the incentives for zero discharge, the flow and mass balance information, the alternatives developed, and the capital and operating cost of the various alternatives.

Electricity constitutes between 25 and 40 percent of a typical wastewater treatment plant's (WWTP) operating budget (New York State Energy Research & Development Authority, 2008) and is second typically to only labor costs. In the 1970's the United States Environmental Protection Agency (US EPA) began promoting energy conservation in WWTPs through the Grants Regulations and Procedures,...