An improved titration model reducing over estimation of total volatile fatty acids in anaerobic digestion of energy crop, animal slurry and food waste

Purser, B.J. Jobling; Thai, S. M.; Fritz, Thomas; Esteves, Sandra; Dinsdale, Richard M.; Guwy, Alan J.

doi:10.1016/j.watres.2014.05.020

Cited by 52 publications

(16 citation statements)

References 20 publications

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“…In 1961, DiLallo and Albertson 36 proposed the first titration method for VFAs measurement. McGhee in 1968 pointed out that the main carbonate alkalinity buffering capacity of an AD system can be titrated between pH 7 and 6 and, for acetic acid, between pH 5 and 4 1, 39]. Based on these theories and findings, a variety of practical procedures for titrations have been proposed for AD process monitoring and control.…”

Section: Classification and Development Of Titration Methods For Dementioning

confidence: 99%

“…The sustainable development of human society has been threatened by energy crises and environmental pollution 1. Anaerobic digestion (AD) has attracted considerable attention for its high efficiency in organic waste treatment and methane production, which can not only control environmental pollution, but also produce bioenergy simultaneously.…”

Section: Introductionmentioning

confidence: 99%

“…However, there are large differences in the approaches and in the results obtained from each method 8. Systematic evaluation and comparison of these methods have not been carried out in sufficient depth to date 1, 12, 27–30. Moreover, there are also many new methods which have been proposed in recent years 1, 31–33.…”

Section: Introductionmentioning

confidence: 99%

“…Systematic evaluation and comparison of these methods have not been carried out in sufficient depth to date 1, 12, 27–30. Moreover, there are also many new methods which have been proposed in recent years 1, 31–33. Therefore, a comprehensive review of these methods is essential to promoting the development and application of titration methods for stability monitoring and control of AD.…”

Section: Introductionmentioning

confidence: 99%

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Monitoring Volatile Fatty Acids and Carbonate Alkalinity in Anaerobic Digestion: Titration Methodologies

Sun

Dong

2016

Chem Eng & Technol

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Volatile fatty acids and carbonate alkalinity have long been considered the key variables in most anaerobic digestion (AD) monitoring strategies as they not only reflect the current process status, but also mirror their response to incoming imbalances and provide an indication of the buffer capacity of digesters to process disturbance and imminent digester failure caused by sudden operational changes. Titration methods are generally acknowledged for routine monitoring and control of biogas plants due to their simplicity and cost‐effectiveness. Systematical evaluation and comparison of these methods have not been carried out in sufficient depth to date. Basic theories of titration methods, their development, influencing factors, and evolution during recent years are reviewed. This review may provide assistance for selection of the most appropriate titration method and in the development of new methods for stability monitoring in the AD processes.

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Section: Classification and Development Of Titration Methods For Dementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Monitoring Volatile Fatty Acids and Carbonate Alkalinity in Anaerobic Digestion: Titration Methodologies

Sun

Dong

2016

Chem Eng & Technol

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“…Continuously sought attributes for system monitoring have to be low cost, low maintenance, easy to use, and produce fast and accurate responses (JOBLING PURSER et al, 2014). In this context, a statistical process control could be used as stability test for the AD process.…”

Section: Introductionmentioning

confidence: 99%

Anaerobic Digestion Stability Test by Shewhart Control Chart

et al. 2017

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ABSTRACT:The anaerobic digestion (AD) operation complexity raise the importance of stability testing to verify whether the operating conditions are under control and whether the process is working as required. The current method of verifying process stability is by a range of the ratio between volatile fatty acidity and total alkalinity (VFA/ TA) within which stable conditions are brought about; these rates vary with the content of organic material. A few indicators as pH or constant biogas production are also used. Therefore, the aim of this study was to propose the use of Shewhart control chart for individual measures as a stability test for AD, as well as to demonstrate its use in poultry litter AD. The method showed to be advantageous since it standardizes a variation range for the process according to the average and verifies the stability by direct measures, such as organic material removal efficiency and biogas production.

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Operation and Control of a Full‐Scale Biogas Plant Treating Wastewater from the Cleaning of Car Tanks

Pfeiffer

Nguyen

Neumann³

et al. 2019

Chem Eng & Technol

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A 1200‐m3 full‐scale biogas plant treating highly polluted wastewater (WW) from the cleaning of tank cars transporting food and fodder is working stably and efficiently despite the WW is constantly varying in strength and composition, is easily acidifying, and low in alkalinity. Na2CO3 has to be added to maintain the digester alkalinity and the digester pH at defined values due to softened water used for car tank cleaning. Monitoring volatile organic acid concentration and controlling the alkalinity in the digester are essential for maintaining the digestion process stability. Biogas production is adapted to the demand by a modulated feeding regime. The drastic modulation of feeding is possible due to the moderate organic loading of the plant along with the high average hydraulic retention time.

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An improved titration model reducing over estimation of total volatile fatty acids in anaerobic digestion of energy crop, animal slurry and food waste

Cited by 52 publications

References 20 publications

Monitoring Volatile Fatty Acids and Carbonate Alkalinity in Anaerobic Digestion: Titration Methodologies

Monitoring Volatile Fatty Acids and Carbonate Alkalinity in Anaerobic Digestion: Titration Methodologies

Anaerobic Digestion Stability Test by Shewhart Control Chart

Operation and Control of a Full‐Scale Biogas Plant Treating Wastewater from the Cleaning of Car Tanks

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