Co-combustion of Agricultural Straw with Municipal Sewage Sludge in a Fluidized Bed: Role of Phosphorus in Potassium Behavior

Ren, Qiangqiang; Li, Linna

doi:10.1021/acs.energyfuels.5b00790

Cited by 43 publications

(31 citation statements)

References 34 publications

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“…Because of the excessive consumption and nonrenewability of traditional energy sources, energy security is deemed as an important element affecting social and economic development. Currently, most combustion studies are based on conventional straw‐based biomass . It is easy to ignore that unconventional biomass (shell‐based biomass) is a promising fuel that provides thermal energy .…”

Section: Introductionmentioning

confidence: 99%

An experimental study of single unconventional biomass pellets: Ignition characteristics, combustion processes, and artificial neural network modeling

Lin

Wang

et al. 2020

Int J Energy Res

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Summary This study applied the artificial neural networks (ANNs) model to the thermal data obtained by suspension ignition and combustion experiment of single peanut shells (PS, millimeter scale) pellet under O2/CO2 atmosphere. ANN11 was the best ANN model for predicting the relevant parameters of PS combustion. The coincidence between ANN prediction data and experimental data was over 99%. Two modes of biomass pellet ignition were observed: homogeneous ignition of volatiles and hetero‐homogeneous ignition of volatiles and char simultaneously. The ignition mode was transformed from homogeneous ignition to hetero‐homogeneous ignition when oxygen concentration was 50%. In addition, it was observed that ignition at the bottom emerged first, and then the upper end was ignited, finally generating an envelope flame. This phenomenon occurred when gas flow temperature exceeded 873 K or the oxygen concentration was greater than 50%. The reduction of ignition delay time and internal ignition temperature from 21% to 50% oxygen concentration was more intense than that of 50% to 100% oxygen concentration. Increasing oxygen concentration or temperature resulted in a shorter, brighter, and more stable volatile flame of biomass pellets, which reduced volatile burnout time. Nevertheless, the impact of gas flow rate on biomass combustion was intricate and irregular.

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Section: Introductionmentioning

confidence: 99%

An experimental study of single unconventional biomass pellets: Ignition characteristics, combustion processes, and artificial neural network modeling

Lin

Wang

et al. 2020

Int J Energy Res

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“…The Ca and Mg compounds in CS can provide reactive chemical sites for phosphorus to form Ca 18 Mg 2 H 2 (PO 4 ) 14 and Ca 2 P 2 O 7 . Ren et al [53] also found that sewage sludge co-combustion with wheat straw leads to the formation of alkali-rich phosphate silicate that restrains the reaction between the alkali and quartz. Reactions between the P-rich additive and alkali metal lead to the formation of K-Ca-P compounds.…”

Section: Incinerationmentioning

confidence: 99%

A review of phosphorus recovery from different thermal treatment products of sewage sludge

Meng

Huang

et al. 2019

Waste Dispos. Sustain. Energy

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Phosphorus (P) is an indispensable element of living organisms and plays an irreplaceable role in the growth of crops. As a non-renewable element, the reserves of phosphorus rock, the primary source of phosphorus in nature, are facing the danger of exhaustion. As a phosphorus-rich solid waste, sewage sludge has gradually become a main renewable phosphorus resource. The combination of effective recycling of phosphorus and innocuous disposal of sewage sludge can not only alleviate the crisis of phosphate rock resources shortage but also reduce the environmental hazards of sewage sludge. This study reviewed the application of thermal treatment in sewage sludge disposal. Besides the advantages of reducing waste volume, decomposing organic pollutants, generating valuable byproducts, it can also significantly promote the recycling of phosphorus. Studies have shown that thermal treatment (incineration, pyrolysis, and hydrothermal) can enrich phosphorus in the products and transform the speciation of phosphorus to increase the bioavailability. The physical and chemical properties of different thermal treatment products and the speciation of phosphorus are different. The transformation and migration of phosphorus affect the efficiency of subsequent phosphorus recovery and reuse. At the same time, this study compared several general phosphorus recovery methods (wet extraction, thermochemical, and electrochemical methods), and further summarized the advantages and disadvantages of various methods and application conditions. This review summarizes recent advances in phosphorus recovery from sewage sludge, identifies challenges and knowledge gaps, and provides the foundation for future research aimed at achieving efficient, economic, and eco-friendly reclamation of phosphorus in sewage sludge.

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“…As shown in Table 2, the contents of P 2 O 5 , CaO, and K 2 O of the fuel blend with 50 wt % CP are higher than those of the other two fuel blends. The reaction between P and alkali metals such as K and Ca in biowastes during the combustion leads to the formation of stable K–Ca–P compounds with a high melting temperature, which is beneficial for reducing the volatilization of P and the formation of particulate matter, thereby increasing the P enrichment efficiency in the bottom ash. , Thus, CP is more effective on the enrichment of phosphorus in ash than RH and SSt.…”

Section: Resultsmentioning

confidence: 99%

“…), may also promote P transformation during thermal treatment. Studies have investigated the incineration of sewage sludge mixed with cotton stalks or wheat straw to improve the P bioavailability of fly ash. , However, few studies have investigated the speciation evolution of P during low-temperature co-combustion of sewage sludge with biowaste. The speciation (e.g., physical distribution and the chemical state) of an element is well known to affect its transport, mobility, and availability.…”

Section: Introductionmentioning

confidence: 99%

Transformation of Phosphorus during Low-Temperature Co-Combustion of Sewage Sludge with Biowastes

Meng

Wang

Wan

et al. 2021

ACS Sustainable Chem. Eng.

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Thermal treatments of phosphorus (P)-rich sewage sludge for efficient P reclamation have recently gained much attention. Our recent research proposed a low-temperature combustion method that can simultaneously target safe waste disposal, fly ash volume reduction, heavy-metal stabilization, P recovery, and energy reuse. To further optimize treatment conditions and gain deeper insights into P speciation, this study systematically characterized P transformation during low-temperature co-combustion of sewage sludge with biowaste by combining X-ray absorption spectroscopy, sequential extraction, and nuclear magnetic resonance spectroscopy analyses. Organic P, phytic acid, and pyrophosphate in the raw feedstock transformed into orthophosphate during low-temperature combustion. With increasing mass fraction of biowaste, low-temperature co-combustion increased the relative abundance of Ca-associated P and decreased the abundance of Fe-associated P. The dominant P species in the produced bottom ash is strongly correlated to the amount and speciation of metals in the feedstock and their affinities to P. The introduction of biowaste altered the enrichment efficiency and availability of P in the ash. The results from this study revealed the effects of combustion conditions and feedstock characteristics on P speciation and provided a fundamental basis for guiding the optimization of the thermal treatment method for eliminating hazardous wastes, reusing energy, and improving P reclamation efficiency.

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Co-combustion of Agricultural Straw with Municipal Sewage Sludge in a Fluidized Bed: Role of Phosphorus in Potassium Behavior

Cited by 43 publications

References 34 publications

An experimental study of single unconventional biomass pellets: Ignition characteristics, combustion processes, and artificial neural network modeling

An experimental study of single unconventional biomass pellets: Ignition characteristics, combustion processes, and artificial neural network modeling

A review of phosphorus recovery from different thermal treatment products of sewage sludge

Transformation of Phosphorus during Low-Temperature Co-Combustion of Sewage Sludge with Biowastes

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