Optimization of partial nitritation in a continuous flow internal loop airlift reactor

Jin, Ren‐Cun; Xing, Bao-Shan; Ni, Wei-Min

doi:10.1016/j.biortech.2013.08.077

Cited by 21 publications

(13 citation statements)

References 30 publications

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“…There is less than a 0.05% chance that an F-value this large 570 26 could occur due to noise. These results are similar to F-values reported by some authors (5.3 < F-571 value < 153.7) [25,27,35].…”

supporting

confidence: 92%

“…This indicates that only 19.8% 559 to 1.98% of the total variation could not be elucidated from the regression models. This is in 560 agreement with other R 2 values obtained from RSM analysis (0.93 < R 2 < 0.99) [25][26][27]35]. The 561 ability of the models to adequately estimate the experimental data with a high degree of fit was 562 corroborated by means of the adjusted coefficient of determination (R 2 adj is 0.7929 and 0.9791 563 for the ambient temperature models and is 0.9505 and 0.9403 for the mesophilic temperature 564 models for methane purity and methane yield, respectively).…”

supporting

confidence: 89%

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Effect of particle size and doses of olivine addition on carbon dioxide sequestration during anaerobic digestion of sewage sludge at ambient and mesophilic temperatures

Linville

Shen

Urgun‐Demirtas

et al. 2016

Process Biochemistry

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10Biogas from anaerobic digestion of sludge at wastewater treatment plants consists of methane, 11 carbon dioxide and trace contaminants which can be upgraded for utilization. Compared to 12 current costly upgrading technologies, mineral carbonation has many benefits by using natural 13 magnesium and calcium rich ores capable of sequestering CO 2 . The feasibility of olivine to 14 sequester CO 2 in-situ during batch anaerobic digestion of sludge was tested for 1) ambient versus 15 mesophilic temperatures, 2) placement of olivine in the digester, and 3) olivine particle size and 16 concentration. Increasing the temperature, increasing the olivine surface area via increased dose 17 and decreased particle size, and elevating the olivine in the reactor increased mineral carbonation 18 rates during anaerobic digestion. At mesophilic temperature, the elevated 5% w/v fine olivine 19 digester had a 17.5% reduction in CO 2 which equated to a 3.6% increase in methane content (%) 20 and at ambient temperature the same condition had a 21.7% CO 2 sequestration resulting in an 21 8.8% increase in methane content compared to the control. Response surface methodology was 22 applied for optimization of digestion time and olivine surface area at both temperatures. 23 25 olivine, wastewater treatment plants 26 27 1. Introduction 28 Anaerobic digestion (AD) is one of the most efficient and widely used technologies for 29 the treatment of sludge from wastewater treatment plants (WWTPs) [1]. In the US, WWTPs 30 produce approximately 6.5 million tons (dry weight) of sludge annually [2]. The total energy 31 produced from WWTP sludge can potentially displace 441 million gallons of gasoline equivalent 32 per year [3]. AD technology offers numerous significant advantages, such as low energy 33 requirements [1], a reduction in pathogens and odors, and a reduction in the total solids, termed 34 biosolids, quantity by converting part of the volatile solids (VS) fraction to biogas [4]. Biogas 35 produced from AD of sludge is primarily composed of 50-70% methane (CH 4 ) and 30-50% 36 carbon dioxide (CO 2 ), with smaller amounts of hydrogen sulfide (H 2 S), ammonia (NH 3 ) and 37 nitrogen (N 2 ) [3,5]. However, biogas utilization requires cleanup and upgrading processes for 38 removal of CO 2 and other contaminants. 39 The upgraded biogas can be used for the production of heat and power and/or co-40 generation, vehicle fuel and chemicals and injection into the natural gas grid [3,5]. Only 48% of 41 the total wastewater flow in the US is treated with AD [6] and less than 10% of WWTPs 42 implementing AD technology utilize biogas for heat and power generation [7]. In July 2014, the 43 US Environmental Protection Agency (USEPA) qualified biogas from landfills and anaerobic 44 digesters as a cellulosic transportation biofuel under the new Renewable Fuel Standards (RFS2) where the biogas can generate D3 Renewable Identification Numbers (RINs) [8]. This mandate 46creates opportunity for US WWTPs to produce biogas as an economically-viable energy sour...

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supporting

confidence: 92%

supporting

confidence: 89%

Effect of particle size and doses of olivine addition on carbon dioxide sequestration during anaerobic digestion of sewage sludge at ambient and mesophilic temperatures

Linville

Shen

Urgun‐Demirtas

et al. 2016

Process Biochemistry

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show abstract

“…The program allows data fitting of model equations containing the unknown constants. The coefficient parameters of the models were estimated through a multiple regression analysis including an ANOVA to evaluate the interaction between process variables and the response [25,32]. Only significant terms were included in the model (p-value < 0.05) except when required to maintain the hierarchal structure.…”

Section: Rsm Model Developmentmentioning

confidence: 99%

“…Only significant terms were included in the model (p-value < 0.05) except when required to maintain the hierarchal structure. The quality of the fit of the model equation was determined via the coefficient of determination, R 2 , and its statistical significance was checked through an F-test [32,33].…”

Section: Rsm Model Developmentmentioning

confidence: 99%

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Impact of trace element additives on anaerobic digestion of sewage sludge with in-situ carbon dioxide sequestration

Linville

Shen

Schoene

et al. 2016

Process Biochemistry

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Please cite this article as: Linville Jessica L, Shen Yanwen, Schoene Robin P, Nguyen Maximillian, Urgun-Demirtas Meltem, Snyder Seth W.Impact of trace element additives on anaerobic digestion of sewage sludge with in-situ carbon dioxide sequestration.Process Biochemistry http://dx. 2 Graphical abstract Highlights: Evaluated trace element addition during anaerobic digestion of sewage sludge  Olivine was used for in-situ CO2 sequestration to produce renewable methane  Olivine and 1.5 mg/L Ni and Co addition increased the methanation kinetics by 6-56%  Lab bench tests achieved up to 56% increase in methane yield  Simultaneously, lab bench tests resulted in up to 17.3% increase in methane volume 3 Abstract Anaerobic digestion (AD) of sludge at wastewater treatment plants can benefit from addition of essential trace metals such as iron, nickel and cobalt to increase biogas production for utilization in combined heat and power systems, fed into natural gas pipelines or as a vehicle fuel. This study evaluated the impact and benefits of Ni/Co and olivine addition to the digester at mesophilic temperatures. These additions supplement previously reported research in which iron-rich olivine (MgSiO4) was added to sequester CO2 in-situ during batch AD of sludge. Trace element addition has been shown to stimulate and stabilize biogas production and have a synergistic effect on the mineral carbonation process. AD with 5% w/v olivine and 1.5 mg/L Ni/Co addition had a 17.3% increase in methane volume, a 6% increase in initial exponential methane production rate and a 56% increase in methane yield (mL CH4/g CODdegraded) compared to the control due to synergistic trace element and olivine addition while maintaining 17.7% CO2 sequestration from olivine addition. Both first-order kinetic modeling and response surface methodology modeling confirmed the combined benefit of the trace elements and olivine addition. These results were significantly higher than previously reported results with olivine addition alone [1].

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Alum-based sludge (AbS) recycling for turbidity removal in drinking water treatment: an insight into statistical, technical, and health-related standpoints

Foroughi

Chavoshi

Bagheri

et al. 2018

J Mater Cycles Waste Manag

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Optimization of partial nitritation in a continuous flow internal loop airlift reactor

Cited by 21 publications

References 30 publications

Effect of particle size and doses of olivine addition on carbon dioxide sequestration during anaerobic digestion of sewage sludge at ambient and mesophilic temperatures

Effect of particle size and doses of olivine addition on carbon dioxide sequestration during anaerobic digestion of sewage sludge at ambient and mesophilic temperatures

Impact of trace element additives on anaerobic digestion of sewage sludge with in-situ carbon dioxide sequestration

Alum-based sludge (AbS) recycling for turbidity removal in drinking water treatment: an insight into statistical, technical, and health-related standpoints

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