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B-4 Odor Control

Receiving and disposing outside grease it is an important aspect of DELCORA’s business. Several upgrades were made to our GAP, including a biological odor control system.

The results: increased convenience for truck drivers, reduced labor for DELCORA operations and maintenance, improved concentrated grease solids, improved odor control, and increased work environment safety.

New Lakeside Raptor Grease Acceptance Plant
This unit screens out large pieces of debris and floating material for disposal without incinerating and which could harm downstream equipment if not removed. Two new grease transfer pumps were also installed—each capable of pumping 400 gallons per minute of up to 8.3% grease at 60 feet.

New grease thickening equipment
The new equipment included new top skimmers, bottom skimmers, beech section, discharge screw conveyor, and tank cover—for odor control and to keep the building safe. Also included were new control panels for the thickeners, automatic controls for the top and bottom skimmers, and a screw conveyor, as well as emergency back-up equipment.

New BioAir odor control system
The odor control system removes harmful gases including hydrogen sulfide. The new tower is designed to treat 11,500 cubic feet/minute and reduce hydrogen sulfide concentration. This biological packed tower scrubber from BioAir has lower maintenance and a robust biological growth that is able to withstand most upsets.

Other upgrades included a submersible heater and air diffusion system, several natural gas unit heaters, four natural gas instant water heaters, and new gas and fire detectors throughout the building.

Natural Gas-Fired Sludge Incinerator Project

Significantly reduced emissions of air pollutants, including carbon dioxide, nitrogen oxides and sulfur oxides by almost 10 million pounds

Over the last two years, DELCORA hasNatural Gas-Fired Sludge Incinerator Project implemented a $2.5-million project to modify its two existing 1975 oil-fired sewage sludge incinerators at the Western Regional Treatment Plant (WRTP) with dual-fired burners that are capable of using either natural gas or No. 2 fuel oil. The project involved incinerator modifications, instrumentation and control upgrades, information systems integration and new natural gas utility infrastructure.

After the first full year of the two incinerators’ operation on natural gas, the Authority saved approximately $1.9 million on the cost of fuel; combined fuel savings in 2013 and 2014 exceeded $3.5 million. Moreover, natural gas is the cleanest fossil fuel. Compared with fuel-oil combustion, natural gas combustion releases lower levels of harmful air emissions, including a lower ratio of carbon emissions, nitrogen oxides and sulfur dioxide, as well as lower levels of carbon dioxide, carbon monoxide and other reactive hydrocarbons, no mercury, and virtually no ash or particulate matter.

Thanks to new state-of-the-art digital controls and integration with the plant’s information systems, including the SCADA system, plant operators and supervisors are better able to optimize operation and maintenance of the incinerators. For example, automated control of temperature, draft, scrubber pressure and associated operating parameters decreases fuel use and reduces the build-up of residue (slag) that must be removed.

Edgmont Crum Creek Sewer Project

A milestone in Edgmont’s implementation of a public sewer system serving eastern Edgmont and an important expansion to DELCORA’s service area

In the summer of 2014, DELCORA Edgmontcompleted the first milestone in Edgmont Township’s planned implementation of a public sewer system to serve eastern Edgmont. The project involved the installation of a new public wastewater collection system for a community of about 1,000 equivalent dwelling units (EDUs) in the Crum Creek District of eastern Edgmont. The total flow from these users is expected to average 350,000 gallons per day (GPD) of mostly residential wastewater.

The first phase of the project involved the installation of a 7,650 foot 10-inch fusible polyvinyl chloride (PVC) force main along Gradyville Road. This force main will convey the wastewater flow that is collected in the Crum Creek District to the interceptor of Central Delaware County Authority (CDCA), which is located in Marple Township.

The second phase of the project involved construction of the collection system. Both new and existing pipes will convey the flow from the Edgmont residents to three new pump stations, which were constructed as part of this project.

The Edgmont Crum Creek Sewer Project is being funded by a bond secured by DELCORA, which will be repaid by Edgmont Township sewer users over the life of the system. The Commonwealth of Pennsylvania also provided an “H2O grant,” which provides single- or multi-year grants to municipalities or municipal authorities to assist with the construction of drinking water, sanitary sewer and storm sewer projects.

Chester-Ridley Creek Pumping Station and Force Main

A significant milestone in attaining the Delaware County Sewage Facilities Plan’s vision of environmentally responsible, cost-effective wastewater management services

Chester Ridley Creek Force Main & Pump Station 7

In December 2014, the Southwest Delaware County Municipal Authority (SWDCMA) transferred wastewater flows from its service areas to DELCORA for treatment at its Western Regional Treatment Plant (WRTP). This was the successful culmination of a $14.4-million project to design and construct the Chester-Ridley Creek Pumping Station and Force Main to enable DELCORA to pump up to 16.65 million gallons per day (MGD) from SWDCMA’s former Baldwin Run wastewater treatment plant in Aston to DELCORA’s WRTP in Chester. The objectives of the project were defined in Western Delaware County’s Act 537 Sewage Facilities Plan Update and approved by the Pennsylvania Department of Environmental Protection (PA DEP). The SWDCMA will decommission and demolish the former treatment plant, while continuing to own and operate its existing wastewater collection system.

The seven municipalities that had been tied into the Baldwin Run plant will benefit from the economies of scale in DELCORA’s 44-MGD (million gallons per day) treatment plant. At the same time, the increased revenue stream allows DELCORA to implement process and handling improvements to increase environmental quality and decrease impact at the WRTP and help to stabilize DELCORA rates.

One of the critical success factors was DELCORA’s collaborative approach to its design, engineering and construction projects. This project involved an exceptional degree of collaboration, with a project team that included representatives of DELCORA’s Administrative, Engineering, Finance, Maintenance Operations and Sewer Maintenance departments; DELCORA’s consulting engineer; and consulting engineers for SWDCMA and Middletown.