Evaluation of the Two-Phase Anaerobic Digestion Process for Baltimore's Back River Wastewater Treatment Plant

Andryszak, Robert; Fooksman, Yulik; Brooks, Patrick

doi:10.2175/193864704784131905

Cited by 5 publications

(8 citation statements)

References 2 publications

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“…VFA production averaging about 6000 mg/L with an SRT of 1.5-3 days (Ghosh et al 1995) has been reported on digesting WAS only. Similar VFA production was reported (Andryszak et al 2004) with an SRT of 1.5 days when digesting a mixture of TPS (thickened PS) and TWAS (thickened WAS). However, for both cases, the sludge was treated in a fully mixed unit at 368C (compared with 278C in the feedwell).…”

Section: Effect Of Operating Conditions On Vfa Productionsupporting

confidence: 78%

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Operating strategies for acid phase digestion: an industrial case study

Gomes

Rabines

Bustamante

2016

Water & Environment J

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Acid phase digestion was investigated for enhanced operation in an industrial wastewater treatment plant. In particular, sludge retention time (SRT), temperature and pH were assessed for determining optimal conditions under operating constraints. Volatile fatty acid (VFA) production and soluble chemical oxygen demand (SCOD) were the key process parameters used to assess system performance. Increase in SRT from 0.8 to 1.4 days (at 22°C) had moderate effect on VFA production (approximately 15% increase), achieving a maximum VFA production of 3600 mg/L. High VFA production rate (0.101 ± 0.035 mg/mgVS.d) was obtained at the highest operating retention time during summer (27°C). The degree of solubilisation of particulate organic matter increased with temperature and retention time. Despite an increase in SCOD (6472 ± 873 mg/L max.), a corresponding increase in VFA was not observed. SCOD showed a linear correlation with decrease in pH, while acidogenesis (SCOD conversion to VFA) was found to be favourable at a pH of 4.5.

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Section: Effect Of Operating Conditions On Vfa Productionsupporting

confidence: 78%

“…Similar VFA production was reported (Andryszak et al . ) with an SRT of 1.5 days when digesting a mixture of TPS (thickened PS) and TWAS (thickened WAS). However, for both cases, the sludge was treated in a fully mixed unit at 36°C (compared with 27°C in the feed‐well).…”

Section: Resultsmentioning

confidence: 99%

Operating strategies for acid phase digestion: an industrial case study

Gomes

Rabines

Bustamante

2016

Water & Environment J

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“…The principal design features of a purpose-built APD are listed below: The objectives of this application are obtaining greater volatile solids loading rates (VSLRs), resulting in a volatile fatty acids (VFAs) concentration range of 5,000 to 10,000 mg/l at the APD discharge, overall median VSr efficiency increase of up to 20 percent, total HRT reduction of up to 20 percent, and increased biogas production. In addition, this application reduces the viscosity of high-thickened solids and therefore improves their transfer characteristics and reduces foaming (Andryszak et al, 2004).…”

Section: Mesophilic Acid Hydrolysis-single Tank Ad Systemmentioning

confidence: 99%

“…Although the methane content of the APD produced biogas ranges between 20 and 30 percent and has higher hydrogen sulfide content than the MPD biogas, the typical combined biogas composition is in the order of 65 percent CH 4 and 35 percent CO 2 with less than 0.1 percent of H 2 S (Andryszak et al, 2004).…”

Section: Mesophilic Acid Hydrolysis-single Tank Ad Systemmentioning

confidence: 99%

Sustainable Energy Management: Achieving Energy Independence at Wastewater Utilities

Whitlock¹,

Sandino²,

Shea³

et al. 2009

proc water environ fed

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This paper focuses on ideas and examples of wastewater facilities attaining energy independence through conservation, efficient systems, and development of renewable energy. Although viable renewable energy alternatives are available, there does not appear to be one renewable energy source that is a panacea for the global energy demand. Instead, it is generally accepted that a global sustainable energy system will be a combination of many different renewable resources. With this vision, no one nation or society would be dependent on another for energy, thus creating universal energy independence. Ultimately, energy independence would be achieved by (1) energy conservation, most importantly, (2) creating more efficient systems, and (3) renewable energy provided by a combination of sources, such as solar power, wind power, hydropower, geothermal power, and bioenergy. Hence, a movement toward maximizing utilization of biologically derived energy coupled with other renewable energy sources has recently become of more interest to wastewater facility management as part of the global renewable energy portfolio.While the challenges faced by engineers are imposing, the industry has responded strongly in recent decades with novel and valuable research efforts and innovative engineering approaches to applying these concepts to advanced performance in the field. These technological advances can be utilized for generation of renewable energy. However, additional research and implementation of many of the technologies discussed in this paper will be necessary before the change from nonrenewable to renewable sources of energy is streamlined. With a new emphasis on renewable energy in the United States and globally, the change will likely be rapid in the first half of this century. Hence, the goal of wastewater facilities achieving energy independence is a worthy one and consistent with the current progression to sustainable systems.

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“…Acid-methane phased digestion has been used to reduce the risk of toxicity from lipids (Kim et al, 2004) and to accelerate reaction rates and increase VS reduction and process stability by providing the optimal environment for the growth of acid-and methane-producing organisms (Andryszak et al, 2004;Harrison et al, 2005). An important advantage of the phased digestion used to justify implementation at SCBWRF was that the new acid reactors would be designed to handle the high solids concentration feed that could temporarily reach TS concentrations of up to 10% solids and through acid phase sludge hydrolysis, convert the sludge and FOG mix to a less viscous feed to the ESDs that would be easier to mix effectively.…”

Section: Recycled Nutrients From Acid-methane Phased Digestionmentioning

confidence: 99%

Recycle Loads Management Strategy Accounts for the Impact of Regional Anaerobic Solids Digestion on Low Limit Biological Nutrient Removal

Kabouris¹,

Engelmann²,

Dulaney³

et al. 2009

proc water environ fed

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This paper evaluates alternatives investigated to reduce chemical addition at a water reclamation facility with anaerobic digestion recycle streams. The alternatives evaluated were: 1. the MLE process with alum addition for P removal and denitrifying filters for N removal (MLE alternative), and 2. the 5-stage Bardenpho alternative process of biological phosphorus removal, activated sludge biological denitrification using methanol addition and the Ostara struviterecovery recycles treatment process was considered. The 5-stage Bardenpho alternative resulted in annual cost operational savings of $640,000-$770,000 compared to MLE alternative under present load conditions and $700,000-800,000 under future load conditions. Reduce chemical and electrical energy consumption and increase net digester methane gas production are other major benifits. The cost of a 5-stage Bardenpho conversion was estimated at $6.1 million. The cost of the Ostara facility was estimated at $5.1 million at present load conditions, with an additional $1.4 million at future load conditions. Process performance would significantly increase: the 14 percent reduction in future average MLSS concentration would reduce the secondary clarifiers load and increase process stability; the effluent total phosphorus concentration would be reduced from about 0.9 mg/L to about 0.4 to 0.5 mg/L; and the nitrate load and load variability of the denitrifying filters would decrease. In addition, since the filters would need to remove only about 1.9 to 3.1 mg/L nitrate under the Bardenpho alternative, compared to about 7.4 to 7.7 mg/L under the MLE alternative, this would significantly reduce the risk of methanol or nitrate effluent breakthrough.

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Evaluation of the Two-Phase Anaerobic Digestion Process for Baltimore's Back River Wastewater Treatment Plant

Cited by 5 publications

References 2 publications

Operating strategies for acid phase digestion: an industrial case study

Operating strategies for acid phase digestion: an industrial case study

Sustainable Energy Management: Achieving Energy Independence at Wastewater Utilities

Recycle Loads Management Strategy Accounts for the Impact of Regional Anaerobic Solids Digestion on Low Limit Biological Nutrient Removal

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