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The City of Columbus, Ohio is under two consent orders from the Ohio Environmental Protection Agency (OEPA) related to wet weather issues. These issues were addressed in 2005 through the development of a Wet Weather Management Plan that dealt with both Combined Sewer Overflows (CSO) and Sanitary Sewer Overflows (SSO). A critical component of the plan was the affordability analysis. The City...

WEFTEC, the largest event of its kind in North America, offers water quality professionals the best in water quality education and training. With almost 200 technical sessions, workshops, mobile sessions, local facility tours and 1,000+ exhibitors, it is the premier water conference! The WEFTEC technical program is selected through a rigorous, peer-review process, ensuring that attendees experience the highest-quality education. WEFTEC speakers are experts and innovators, leading the way in water quality. The following paper was presented at WEFTEC 2017.

Lehigh Cement Company has conducted preliminary and in depth testing of Class A dried biosolids (DBS) as a fuel replacement in our cement kiln at Union Bridge, Maryland. Lehigh's parent company, Heidelberg Cement, has been using DBS in European cement kilns for several years. These programs have proved the safety and environmental soundness of this concept. Lehigh's ongoing development of these...

 

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 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...