Sustainability Incorporated into the Solids Handling Improvements of the Douglas L. Smith Middle Basin Wastewater Treatment Plant

Gabel, Dale; Pekarek, Susan; Nolkemper, Doug; Kalis, Mike

doi:10.2175/193864709793846268

Cited by 3 publications

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“…The debris in septage can create issues with these standard processes so some utilities have constructed separate septage receiving stations to remove the debris prior to it entering the normal wastewater flow stream. The initial FOG/HSW receiving stations appear to have been modelled after these septage receiving stations and consist of bar screens and heavy debris removal basins as illustrated in Figure 1 (Gabel et al 2009). Significant improvements from these early systems have been developed to provide the treatment plants' operations staff with flexibility in managing these waste streams, provide more 'operator friendly' approaches to maintaining receiving station equipment and facilities, and capture as much energy as possible from the FOG/HSW.…”

Section: Fog Waste Receiving Station Design Considerationsmentioning

confidence: 99%

FOG Waste receiving and processing facility design considerations

Williams¹,

Gabel²,

Robillard³

2018

Water Practice and Technology

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Fats, Oils, and Grease (FOG) wastes and high-strength wastes (HSW) are frequently received at municipal water resource recovery facilities (WRRFs) as trucked-in wastes. These wastes offer significant benefits in terms of revenue from tipping fees and feedstock for co-digestion in anaerobic digesters that produce biogas, which can be beneficially used as fuel. The number of treatment plants receiving and beneficially using trucked-in wastes currently in operation or under investigation is increasing rapidly across the North America as utilities strive to remove this material from normal wastewater to avoid sewer system clogging, maintenance and backups, avoid the oxygen demand of these wastes in secondary treatment systems, and to capture and beneficially reuse the energy that is contained within the material. Historically, trucked-in wastes have been discharged to the head end of treatment plants or to an upstream manhole in the incoming interceptor sewer to enable the material to be mixed with raw wastewater prior to treatment through the liquid stream of the WRRF. However, this approach results in loss of material and degradation of the energy value of the FOG wastes and HSW and also creates collection and maintenance issues in the preliminary and primary treatment systems. To prevent degradation of the material and retain maximum energy for the CHP system, receiving stations are being constructed for direct off-loading of the wastes to processing and storage facilities prior to their transfer to anaerobic digesters at a relatively uniform rate to minimize the potential for digester upsets while at the same time to increase biogas production. This paper presents the key components and considerations in the design and operation of modern FOG waste receiving and processing facilities.

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Section: Fog Waste Receiving Station Design Considerationsmentioning

confidence: 99%

FOG Waste receiving and processing facility design considerations

Williams¹,

Gabel²,

Robillard³

2018

Water Practice and Technology

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“…Johnson County, KS: The Douglas L. Smith Middle Basin Wastewater Treatment Plant (Middle Basin WWTP) in Johnson County, Kansas treats an average flow of 14.5 mgd and recently included digester upgrades and a receiving station to process FOG waste from local restaurants grease traps and industrial food processing sources at with a design capacity of 12,400 gpd of FOG (Gabel et al, 2009). After removal of debris, screening, grinding, and heating, the material is fed directly to the mesophilic digesters.…”

Section: Case Study Descriptionsmentioning

confidence: 99%

Making Anaerobic Digestion Work with High Strength Wastes: Lessons Learned from Pilot to Full Scale

Erdal¹,

Gabel²,

Kabouris³

2011

proc water environ fed

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Codigestion of wastewater solids and food wastes has been practiced in Europe to increase gas productions in the existing anaerobic digester systems and energy generation. Although a review of the codigestion technologies and food waste sources indicate that various types of high strength wastes including food wastes can be amenable for codigestion, optimization of gas production and system performance requires a thorough analysis as well as the available waste sources within the vicinity of the host facility. The food processing waste digestion showed a 35% greater biogas generation compared to the control digester that has not received any supplemental waste. The tests also confirmed that the wastes did not cause inhibition of biologic activity under the mesophilic conditions. Benefits due to the increased biogas production by anaerobic digestion of FOG wastes at the Johnson County facility were calculated to increase the biogas generation by more than 50%. Following implementation, the overall program will reduce the treatment plant's electricity purchase costs by over $500,000 per year under average conditions utilizing the new cogeneration system. At Pinellas County, FL the payback period of the evaluated biogas cogeneration project was estimated to be from 5.5 to 7.5 years, with associated 20-year lifecycle benefits in the order of $5.5 to $9 million, depending on the cost of electricity and natural gas.

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An overview of biogas production and utilization at full-scale wastewater treatment plants (WWTPs) in the United States: Challenges and opportunities towards energy-neutral WWTPs

Shen

Linville

Urgun‐Demirtas

et al. 2015

Renewable and Sustainable Energy Reviews

424

183

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a b s t r a c tRecently the United States Environmental Protection Agency qualified biogas from landfills and anaerobic digesters as a cellulosic transportation biofuel under the expanded Renewable Fuel Standard (RFS2). Biogas is a renewable fuel that can generate Renewable Identification Number credits for the producer. The wastewater industry may not be able to keep pace with this opportunity. Less than 10% of WWTPs in the US have currently produced biogas for beneficial use. Supporting growth of the biogas industry requires implementation of new practices and policies. In this review, the barriers, gaps, and challenges in deploying biogas production technology are identified. Issues are classified as economic, technical, social or regulatory issues. Some of the critical challenges to the economics of digester operations are the slow rate of biogas generation, the low energy content of the biogas, and the costs to upgrade the biogas.Currently there is little biogas utilization at US WWTPs. Most biogas is flared while some is used for onsite process heat and power production. Case studies of co-digestion of biosolids with organic wastes at field-scale show the use of co-digestion could overcome significant economic challenges including higher methane yield, more efficient digester volume utilization and reduced biosolids production. These findings could provide guidance in retrofitting existing facilities or in designing new biogas production and utilization systems. The RFS2 ruling increases market certainty, hence reduces risk. The evaluation of applications of co-digestion at WWTP scales ranging from 1 million gallons per day (MGD) to 375 MGD determined its potential feasibility for different types of digester operation, organic waste and loading rate as well as effectiveness of providing energy self-sufficiency at the WWTPs. This work could improve economics of anaerobic digestion at WWTPs, enabling viable and sustainable biogas industry and offsetting costs for wastewater management.

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Sustainability Incorporated into the Solids Handling Improvements of the Douglas L. Smith Middle Basin Wastewater Treatment Plant

Cited by 3 publications

References 0 publications

FOG Waste receiving and processing facility design considerations

FOG Waste receiving and processing facility design considerations

Making Anaerobic Digestion Work with High Strength Wastes: Lessons Learned from Pilot to Full Scale

An overview of biogas production and utilization at full-scale wastewater treatment plants (WWTPs) in the United States: Challenges and opportunities towards energy-neutral WWTPs

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