The Orange County Sanitation District (OCSD) scheduled an update of its 2002 Odor Control Master Plan for 2014. The Engineering Planning Division began the assessment project in July 2013, which is to be completed in two separate phases. Phase I will collect the necessary information about the odors present at the different treatment processes at its two plants, and Phase II...

 

 

Kambhu and Andrews (1969) conducted the first research effort focusing on ‘autothermal thermophilic aerobic digestion’ (ATAD) technology in the late 1960's. Using a computer simulation, these researchers theoretically demonstrated that autothermal operation was possible with systems supplied both with high-efficiency aerators and influent TSS levels ranging between 4 and 6% solids.

Kambhu and Andrews (1969) conducted the first research effort focusing on ‘autothermal thermophilic aerobic digestion’ (ATAD) technology in the late 1960's. Using a computer simulation, these researchers theoretically demonstrated that autothermal operation was possible with systems supplied both with high-efficiency aerators and influent TSS levels ranging between 4 and 6% solids.

The 2nd Street Pump Station and Force Main Project (2nd St. PS) provides adaptive means of managing two major Wastewater Treatment plants and tributary sewer infrastructure during dry and wet weather by providing the ability to choose either: (a) what level to maintain in three interceptors during moderate wet weather events; or (b) how much flow to receive at either plant...

Numerical modeling was used to test and improve the capacity of existing secondary clarifiers for the City of Longmont, Colorado. The model was used to develop an energy dissipating inlet for a new clarifier and develop modifications that could be retrofit into two existing clarifiers to improve their settling capacity. The existing clarifiers were retrofitted and the plant data showed improved...

In 2005 the City of Los Angeles decided to incorporate three dimensional (3D) modeling software into its sewer system design projects. The idea for this modeling application originated in part from the coordination activities with the Los Angeles Region Imagery Acquisition Consortium (LAR-IAC) involving high-resolution terrain and orthophoto imagery for the Los Angeles region. This paper discusses...

Dissolved Air Flotation (DAF) is one of the first unit operations in primary wastewater treatment and is designed to separate suspended solids. In food and beverage applications where clean in place (CIP) is common, large swings in wastewater solids loading, charge demand and pH can occur frequently. Demand for coagulants and flocculants added to aid in DAF solid/liquid separation varies with...

East Bay Municipal Utility District (EBMUD) conducted a pilot study to demonstrate the production and use of biodiesel from interceptor grease waste. Bench-scale testing was followed by pilot-scale production of 200 to 400-L batches. Brown grease with a free fatty acid (FFA) content of 54-100% was obtained from interceptor grease hauled to EBMUD's wastewater treatment plant. Free fatty acids were...

The integrated control system, a central component of the recently completed Littleton/Englewood Wastewater Treatment Plant's Phase 2 project, was engineered and implemented by Brown and Caldwell to provide value to the owner over the entire life-cycle of the project. The focus on value led to the development of advanced features that provided benefits during project delivery, facility operation,...

 

The 39th Street conduit is the Metropolitan Water Reclamation District of Greater Chicago's (District's) oldest and largest intercepting sewer. The most cost-effective method to rehabilitate the 6.10 meter (20 foot) diameter brick sewer was to complete the project in two phases, limiting service disruption and flooding risk. Phase 1, completed in 2012, consisted of a deep...

When a total R-value of 0.7 was reported for a major flow basin in an I/I study in the City of Columbus, it raised some eyebrows. A total R value of 0.70 meant that 70% of the rain water falling on the basin was making its way into the sewer system. Most shockingly, the sewer had only a very small section of combined sewer; it was almost entirely a separate sanitary sewer! When these extremely...

A chlorine system conversion project at the 91st Avenue Wastewater Treatment Plant was initiated to convert the bulk chlorine system which consisted of four 20-ton permanent storage tanks and two 17-ton mobile truck trailer mounted system to a multiple one-ton cylinder system. The project also included the replacement of plastic pipe used for the conveyance of both chlorine gas (vacuum) and...

Dropping sewage from near surface collection systems into deep tunnels involves a number of challenges, including the odor control, air entrainment, solids management, energy dissipation, surge control, and access for personnel and equipment. The use of drop structures to handle large flows will become more prevalent over the next several years due to the large number of Combined Sewer Overflow...

Integrated design strategies in closed loop recirculating aquatic systems (RAS) enables unit operation refinement and process consolidation. With federally mandated increases in the levels of required waste water treatment, continued improvements in their economic competitiveness has resulted in closed loop systems receiving increased application in a wide variety of aquatic industries. The...

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...

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...