Experimental Study on Molten Salt Oxidation of High Salt Content Pharmaceutical Residue

Lin, Chengqian; Chi, Yong; Jin, Yuqi; Song, Huibo

doi:10.1016/j.proenv.2016.02.045

Cited by 14 publications

(9 citation statements)

References 12 publications

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“…On the other hand, further oxidation of NO is suppressed, so that the emission of NO and its mole ratio increase. However, the emission of NO at 700 °C and 750 °C are lower than in previous studies in which the feeding rate was only half of that in the present study (Lin et al, 2016). Probably some of the nitrogen in the residue reacts with NO, reducing it, instead of reacting with oxygen owing to the particular hydrodynamic characteristics of the multi-phase system of the present reaction vessel.…”

Section: Resultscontrasting

confidence: 90%

“…When the feeding rate is only 0.25 g per minute, SO 2 is rarely detected, irrespective of the experimental conditions (Lin et al, 2016). It is likely caused not only by the fact that there is less sulphur, but also by the longer residence time of gas in the salt bath owing to its lower gas velocity, as found in preliminary experiments using a transparent equal size reactor, with a mixture of water and glycerine that has a similar viscosity like the binary carbonates.…”

Section: Resultsmentioning

confidence: 99%

“…One of them is shown in Figure 1: It has two parallel baffles with two dozen small holes of a diameter of 3 mm; the distance between nozzle and the baffles is 2 cm, aiming at generating small bubbles, rather than big bubbles as yielded from a tube nozzle. The other one is a vertical tube without baffle used already in our previous work (Lin et al, 2016). More gas bubbles were observed in preliminary experiments when using the modified feeding tube in a transparent equal size reactor made of transparent plastic containing a mixture of water and glycerine, and the mixture of gas and liquid was more uniform as well as a relative bigger gas holdup was achieved.…”

Section: Methodsmentioning

confidence: 99%

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Molten salt oxidation of organic hazardous waste with high salt content

et al. 2018

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Organic hazardous waste often contains some salt, owing to the widespread use of alkali salts during industrial manufacturing processes. These salts cause complications during the treatment of this type of waste. Molten salt oxidation is a flameless, robust thermal process, with inherent capability of destroying the organic constituents of wastes, while retaining the inorganic ingredients in the molten salt. In the present study, molten salt oxidation is employed for treating a typical organic hazardous waste with a high content of alkali salts. The hazardous waste derives from the production of thiotriazinone. Molten salt oxidation experiments have been conducted using a lab-scale molten salt oxidation reactor, and the emissions of CO, NO, SO, HCl and dioxins are studied. Impacts are investigated from the composition of the molten salts, the types of feeding tube, the temperature of molten carbonates and the air factor. Results show that the waste can be oxidised effectively in a molten salt bath. Temperature of molten carbonates plays the most important role. With the temperature rising from 600 °C to 750 °C, the oxidation efficiency increases from 91.1% to 98.3%. Compared with the temperature, air factor has but a minor effect, as well as the composition of the molten salts and the type of feeding tube. The molten carbonates retain chlorine with an efficiency higher than 99.9% and the emissions of dioxins are below 8 pg TEQ g sample. The present study shows that molten salt oxidation is a promising alternative for the disposal of organic hazardous wastes containing a high salt content.

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Section: Resultscontrasting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Molten salt oxidation of organic hazardous waste with high salt content

et al. 2018

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“…[2,27]. The fractions are characterized by reactive inorganics Eurasian Chemico-Technological Journal 23 (2021) 181-189 mixed with large amounts of organics, and it enriches the reactive inorganics in biomass, sharing similarity with pharmaceutical residues [28][29][30] (which are often incinerated). A deep understanding of the thermochemical conversion characteristics of this type of mixture is important to optimize the combustion process for low-grade solid fuels (low-grade coal, biomass) and biogenic waste (municipal waste, pharmaceutical residue).…”

Section: Article Infomentioning

confidence: 99%

Oxidation Characteristics of Water Soluble Fractions of Agro-Stalks with Focus on Function of Reactive Inorganics

Zhao

Behrendt

et al. 2021

Eurasian Chem. Tech. J.

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In order to deepen the understanding of the thermochemical behavior of reactive inorganics, which play an important role in slagging and fouling during combustion of agro-stalks, the oxidation behavior of the water-soluble fraction of corn stover, wheat straw and rice straw was examined using a simultaneous thermogravimetric analyzer. The oxidation characteristics were discussed in combination with elemental analysis of water-soluble fractions. Results showed that reactive inorganics elements account for 30–40% in water-soluble fractions of the three agro-stalks and carbon was oxidized at two separate stages. Four stages were found during oxidation of water-soluble fractions – (1) devolatilisation of organics (100‒400 °C); (2) oxidation of char (400–650 °C); (3) oxidation of char with melting of salts or decomposition of carbonate (650–800 °C); (4) vaporization of KCl (800–1000 °C). This work provides a base study for an optimized design of combustion for agro-stalks and pharmaceutical waste.

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“…As a heat transfer medium, molten salt could enhance heat transfer. Therefore, the molten salt method provides a new way to dispose of pyrolytic organic solid wastes (Lin et al, 2016(Lin et al, , 2018. However, to directly treat of FA with the molten salt method has not been reported in recent years.…”

Section: Introductionmentioning

confidence: 99%

The heavy metal leaching property and cementitious material preparation by treating municipal solid waste incineration fly ash through the molten salt process

et al. 2019

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This research investigated the heavy metal leaching property and cementitious material preparation by treating municipal solid waste incineration fly ash through the molten salt process. The results indicated that the heavy metal thermal evaporation of fly ash in the molten salt was related to molten salt composition, heat treatment temperature and atmosphere. After treatment with sodium chloride molten salts (contains 10–50 wt% calcium chloride) from 900°C to 1000°C for 2 h, the leaching concentrations of lead, cadmium, copper, zinc and other heavy metals in fly ash were decreased more than 90% and they could fully meet with the landfill standard. Moreover, after molten salt treatment, the weight fraction of fly ash was reduced by 50 wt% than the original one, and the fly ash has been changed as a kind of cementitious material, which has excellent cementitious property. The X-ray diffraction result indicated that the main crystal mineral composition of cementitious materials obtained was alite, belite, alinite and calcium sulphate.

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Experimental Study on Molten Salt Oxidation of High Salt Content Pharmaceutical Residue

Cited by 14 publications

References 12 publications

Molten salt oxidation of organic hazardous waste with high salt content

Molten salt oxidation of organic hazardous waste with high salt content

Oxidation Characteristics of Water Soluble Fractions of Agro-Stalks with Focus on Function of Reactive Inorganics

The heavy metal leaching property and cementitious material preparation by treating municipal solid waste incineration fly ash through the molten salt process

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