scholarly journals Comparing Physicochemical Properties and Sorption Behaviors of Pyrolysis-Derived and Microwave-Mediated Biochar

2021 ◽  
Vol 13 (4) ◽  
pp. 2359
Author(s):  
Colten A. Brickler ◽  
Yudi Wu ◽  
Simeng Li ◽  
Aavudai Anandhi ◽  
Gang Chen

Biochar’s ability to amend and remediate agricultural soil has been a growing interest, though the energy expenses from high-temperature pyrolysis deter the product’s use. Therefore, it is urgent to improve the pyrolysis efficiency while ensuring the quality of produced biochar. The present study utilized three types of feedstock (i.e., switchgrass, biosolid, and water oak leaves) to produce biochar via conventional slow pyrolysis and microwave pyrolysis at different temperature/energy input. The produced biochar was characterized and comprehensively compared in terms of their physiochemical properties (e.g., surface functionality, elemental composition, and thermal stability). It was discovered that microwave-mediated biochar was more resistant to thermal decomposition, indicated by a higher production yield, yet more diverse surface functional groups were preserved than slow pyrolysis-derived biochar. A nutrient (NO3-N) adsorption isotherm study displayed that microwave-mediated biochar exhibited greater adsorption (13.3 mg g−1) than that of slow pyrolysis-derived biochar (3.1 mg g−1), proving its potential for future applications. Results suggested that microwaves pyrolysis is a promising method for biochar production.

2011 ◽  
Vol 25 (4) ◽  
pp. 1521-1528 ◽  
Author(s):  
Pak Sui Lam ◽  
Shahab Sokhansanj ◽  
Xiaotao Bi ◽  
C. Jim Lim ◽  
Staffan Melin

Author(s):  
Snober Irshad ◽  
Mohammed A. Paul ◽  
Riyaz A. Bhat ◽  
Zubair Ahmad Akhoon ◽  
S. Rafeh ◽  
...  

Background: Milk is a highly nutritious food that serves as an excellent growth good medium for microorganisms. Converting milk into milk powder increases its shelf life and can be stored for extended period (about 1 year) without substantial loss of quality even at ambient temperatures. Methods: The current investigation was undertaken with the aim of evaluating the quality of milk powder in Kashmir division for characterizing its physico-chemical and adulteration profile. Since all the dried milk is imported in the valley, it is important to ascertain its quality. For this purpose, whole valley was divided into three zones namely north, south and central. The physiochemical properties and adulteration profile of all the milk powder samples, collected from three zones (north, center, south) were determined. Result: The physiochemical properties of all the milk powder samples were to be of approved quality, irrespective of the brand and class. Adulteration profile of milk powder was seen to match completely to the standards. Milk powder should be free from all the adulterants to ensure its safe and wholesome consumption to consumers. A very few samples were found positive to alkaline neutralizer.


2021 ◽  
Vol 13 (20) ◽  
pp. 11187
Author(s):  
Kawthar Frikha ◽  
Lionel Limousy ◽  
Muhammad Bilal Arif ◽  
Nicolas Thevenin ◽  
Lionel Ruidavets ◽  
...  

The present study focuses on the valorisation of winery industry wastes through slow pyrolysis of exhausted grape marc (EGM). The optimal pyrolysis parameters were firstly identified by small scale experiments carried out using thermogravimetric analysis. Nine pyrolysis temperatures were tested and their influence on the decomposition of the EGM residue and biochar yield was evaluated. Then, biochar production was conducted in a pilot plant at three chosen temperatures (450, 500 and 550 °C) at which the biochar was shown to be stable. The effects of biochar application to soil with respect to plant (ryegrass) growth was also evaluated. Pyrolysis of EGM at the 450–550 °C temperature range has been shown to generate thermally stable and nutrient-rich biochars, but only the biochar produced at 450 °C showed a marked benefit effect of ryegrass growth.


2004 ◽  
Vol 120 ◽  
pp. 315-323
Author(s):  
J. Grum ◽  
R. Šturm

This paper shows a process of selection of optimum conditions for laser remelting of nodular cast iron. The optimisation takes into account a specified depth of the hardened layer, for which an appropriate energy input is specified while taking into account the mode of guiding the laser beam. Strain criteria are given for the optimisation of the remelting process, i.e., minimum energy input at a given depth of the hardened layer, minimum distortion of the machine part and a desired variation of residual stresses across the hardened layer. Practical tests of optimisation showed the logic of adhering to the aforementioned criteria, because we can significantly influence the quality of the product at lower costs of manufacturing.


1985 ◽  
Vol 99 (3) ◽  
pp. 191-200
Author(s):  
P.C. Ritsema Van Eck

AbstractIn 1953 the Rijksmuseum acquired a wheel-engraved goblet documented as the work of Johannes Mattheus Kieseling of Rotterdam (Note I). More facts have recently come to light about his life and work. He was born in 1691 and first mentioned in Rotterdam in 1717, when he was enrolled in the register of citizens as coming from 'Saxengota' (Note 3 and 4). In 1718 he married Maria Sluyters of Rotterdam (Note 5) and a daughter Maria Martha was born to them in 1722 (Note 6) . Before then, in 1719, he had bought a house on Vissersdijk (Note 7). He was buried on 19 October 1735. He had moved to Geldersekaay before then and the facts that he owned his house and that his wife paid dues for his burial show that he must have been reasonably well off. He probably derived most of his income from the glass shop he ran rather than from engraving. He is known to have supplied glasses to various polder boards (Note 10). He enjoyed a certain renown as a glass engraver and there were some glasses by him in the well-known collection of Jan Bisschop of Rotterdam (Note I ). These were engraved with a Bacchanal, merry peasants and a duck decoy. The goblet in the Rijksmuseum (Fig. I, Note 12) still has its original leather case lined with red cloth. It had a cover originally, but this is now missing. It is described at length by Pieter de Bye of Gorinchem in his account of the society 'Den Negenden' ('The Ninth'), of which he was a member, an further in formation is given in the memoirs of Diderik van Bleyswijk, burgomaster of Gorinchem. After a scandal in 1684 the ruling families in the town split into two camps engaged in a continuous struggle for power. 1687 saw the foundation of 'De Vriendelijke Bijeenkomst' ( The Friendly Gathering)-society) which owmed a silver cup, while 'Den Negenden' was fouded on 9 December 1727. The members of 'Den Negenden' met every month for a cold supper in the house of one of their number, the goblet, which could only be used for toasting the society, being taken along in its case. It was designed by De Bye himself, a detailed drawing being supplied by Frans van Mieris the Younger of Leiden. Kieseling was commissioned on 26 January 1732 to engrave it and was paid 75 guilders for the job. The goblet was ceremonially inaugurated on 3 August 1732, but in October that year it was broken, so a new one was ordered of the same de sign, but with a few more coats of arms added. The design features figures representing 'Concord' (Fig.2), 'Reason' (Fig.3), 'Counsel' (Fig.4) and Patriotism (Fig.5) separated by columns, with an inscription above in which these virtues are also mentioned. Above the columns are the arms of the Dutch Republic, Holland, Gorinchem and the Land van Arkel and the 'bond of friendship', represented by two clasped hands above the Gorinchem arms with a ribbon on which hang the arms of the twelve members. The date of the society's foundation on the foot is encircled by a snake biting its own tail, the symbol of the eternal bond (Fig. 6). The cover was decorated with oak leaves. This goblet came into use on 8 November 1733, but the society, fell apart in February 1734, one of the members even going over to the opposite camp and taking the goblet with him! In the collection of the De Overwaard Polder Board at Kinderdijk are eight glasses also firmly documented as engraved by Kieseling (Figs. 8, 9, 10, Note 16). These are the survivors of thirteen supplied by him in 1721 with a covering letter and bill (Fig.7). The glasses listed in the letter comprise ten engraved with the arms of members of the board, one with 'Friendship', one with 'Peace and Freedom' and one itiscribed 'Collegium in Aeternum esto'. The members in question had to pay, for the glasses themselves. In 1728 the board decided to have a glass case made in which to keep the engraved glasses, each new member being required to present a glass with his arms and an appropriate motto or device for placing in this case (Note 18). The board's rich collection of glass is still preserved thus today. Kieseling was a creditable engraver, but no more than that. The quality of his engraving can best be compared with that of Willem Otto Robart, a contemporary working in The Hague and Leiden (Note 19). He was certainly the least gifted of his known compatriots working in Holland, but his presence does confirm the German influence on 18th-century Dutch wheel-engraving. Little is known of the circumstances in which glass-engravers worked here in the 18th century, but Kieseling now proves, like Robart, to have kept a shop as well. The detailed documentation of his work further gives a good insight into the way engraved glass was used in the 18th century, another subject about which little is known as yet.


2014 ◽  
Vol 54 (1) ◽  
pp. 28-34 ◽  
Author(s):  
Monika Kováčová ◽  
Miloš Matúš ◽  
Peter Križan ◽  
Juraj Beniak

The quality of a high-grade solid biofuel depends on many factors, which can be divided into three main groups - material, technological and structural. The main focus of this paper is on observing the influence of structural parameters in the biomass densification process. The main goal is to model various options for the geometry of the pressing chamber and the influence of these structural parameters on the quality of the briquettes. We will provide a mathematical description of the whole physical process of densifying a particular material and extruding it through a cylindrical chamber and through a conical chamber. We have used basic mathematical models to represent the pressure process based on the geometry of the chamber. In this paper we try to find the optimized parameters for the geometry of the chamber in order to achieve high briquette quality with minimal energy input. All these mathematical models allow us to optimize the energy input of the process, to control the final quality of the briquettes and to reduce wear to the chamber. The practical results show that reducing the diameter and the length of the chamber, and the angle of the cone, has a strong influence on the compaction process and, consequently, on the quality of the briquettes. The geometric shape of the chamber also has significant influence on its wear. We will try to offer a more precise explanation of the connections between structural parameters, geometrical shapes and the pressing process. The theory described here can help us to understand the whole process and influence every structural parameter in it.


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