The wastewater industry is increasingly striving to reduce operations costs while producing effluent with low nutrient concentrations. This paper presents the “A2B” Process, a novel strategy for carbon redirection that can have advantages over the traditional adsorption/bio-oxidation (A-B) process, as it is easier to implement and operate in a range of conventional Biological Nutrient...

The Tama River, the largest river in Tokyo, runs through Tokyo from west to east, flowing into Tokyo Bay. Since about half of the river flow in the middle of the course of the river is treated wastewater, quality of treated wastewater greatly affects the quality of the river water itself. Regional Sewerage Office, which controls the sewage system of Tama area, has adopted A2O-based facilities in...

The European-style A/B process utilizes a very high rate activated sludge (HRAS) A-stage operated at a low sludge age and low DO. The aim of the HRAS process is to provide a cost effective means of removing carbon while decreasing aeration demand and volume required for the subsequent B-stage process, which usually consists of biological nutrient removal (BNR). A pilot study to evaluate the...

Petroleum industries have to satisfy to ever increasing environmental demands in terms of air, water and soil quality criteria. Among the substances identified by USEPA in the recent NPDES changes (July 2000), inorganic nitrogen is now a source of degradation for receiving waters and requires an additional end-of-pipe treatment. This paper will present the results of a pilot scale study where...

This presentation will provide an overview of the new biosolids land application certification program that is being developed by the Association of Boards of Certification (ABC). Two levels of certification will be offered by ABC, with class I covering material required for a field operator and Class II covering material required for a manager in direct responsible charge. ABC is expecting to...

This paper describes an alternatives evaluation for upgrading the system used for disinfection of effluent discharged by the City of Aberdeen’s Wastewater Treatment Plant (WWTP). The City currently uses gas chlorination for disinfection of WWTP effluent and a gas sulfur dioxide system for dechlorination. Although the disinfection system has proven to be safe and effective in meeting the...

The addition of external carbon sources for denitrification becomes necessary for wastewater treatment plants in order to meet more stringent requirement of effluent nitrogen (N) discharge to surface waters. Price volatility and safety issues associated with methanol, the commonly used external carbon source, has motivated the investigation on other alternative compounds capable of efficiently...

 

The City of Berea has experienced water-in-basement (WIB) problems for many years. In July of 2011, a significant storm event caused severe flooding in many areas of the City. As a result, the City hired URS Corporation of Cleveland to assist with identifying inflow and infiltration (I/I) sources on both public and private property in one study area. The Fair Street was where the City received the...

Milorganite is a dry granulated lawn fertilizer produced from Milwaukee Metropolitan Sewerage District (MMSD) biosolids. This treatability study was conducted to compare the performance of Milorganite as a nutrient source (nitrogen and phosphorus) in the remediation of diesel fuel contaminated soil to that of Scott's Turf Builder (STB), a commercial lawn fertilizer. Test chambers were constructed...

The City of London is proposing to present at the Weftec 2012 Conference: London's Two-phased Climate Change Adaptation Strategy and Phase 1 completion that included the following studies: “Updated Rainfall Intensity Duration Frequency Curves (IDF) for the City of London under changing climate” – (Study #1) and “Vulnerability of Infrastructure under Climate...

The Emirate of Abu Dhabi has experience tremendous growth since the mid-1970's resulting in significant overloading of its existing sewerage system. Master planning determined that the best long-term wastewater collection and conveyance solution was construction of a deep tunnel sewer system to relief the existing system and to provide added capacity to accommodate further growth. Implementation...

The Emirate of Abu Dhabi has experienced accelerated growth since the mid-1970's when its current sewerage system was designed. The Abu Dhabi Sewerage Services Company (ADSSC) is the service provider for sewerage services throughout the Emirate. Many of its existing sewerage infrastructure assets are overloaded and reaching the end of their intended life. ADSSC has embarked on a major capital...

Interactions between PAOs and GAOs in EBRP systems have been reported as one of the major causes of EBPR failure. This study investigated the abundance of the PAO species Candidatus accumulibacter phosphatis and the GAO species Candidatus competibacter phosphatis in a fullscale well performing EBPR system. General changes in the microbial population of the system were also assessed. The molecular...

Academy 2000, the U.S. EPA Watershed Academy's distance learning website, uses the Internet as a far-reaching and free learning device for people working at a watershed level anywhere in the world. Despite its promise as a new training tool, the Internet is still a new medium in which trainers have little experience and learning curves are presently steep. This paper shares experiences gained in...

The American Chemistry Council1 (ACC) is pleased to offer the following remarks on EPA's Preliminary Effluent Guidelines Program Plan for 2004/20052. The Council's member companies have a great interest in the future of the Effluent Limitations Guidelines (ELG) program, and we look forward to working with EPA as the Agency moves forward with its draft Strategy for National Clean Water Regulations...

Polymeric membranes are widely used in aeration systems for biological treatment. These membranes may degrade over time and are sensitive to fouling and scaling. Membrane degradation is reflected in a decline in operating performance and higher headloss, resulting in increased energy costs. Mechanical property parameters, such as membrane hardness, Young's modulus, and orifice creep, were used to...

With growing concerns over environmental issues, escalating costs and decreasing municipal budgets, there has never been a greater need for innovation in municipal wastewater treatment plant solids (WWTPS) processing than there is today. Newly developed technological approaches are often accompanied by increased costs and complexity. This paper focuses on some very significant improvements made to...

Parallel pilot testing of flat sheet and hollow fiber submerged membrane technologies was conducted as part of a project to upgrade the industrial wastewater treatment plant (WWTP) at the Boehringer Ingelheim Chemicals (BICI) facility in Petersburg, VA. The WWTP was converted from a sequencing batch reactor (SBR) to a flow-thru membrane bioreactor (MBR) system in order to accommodate higher...