Physico-chemical characterization of biochars from vacuum pyrolysis of South African agricultural wastes for application as soil amendments

Uras, Ümit; Carrier, Marion; Hardie, Ailsa G.; Knoetze, J.H.

doi:10.1016/j.jaap.2012.08.007

Cited by 98 publications

(46 citation statements)

References 39 publications

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“…Similar increases in K and Na content in biochar have been observed by Xu et al (2013); Smider and singh (2014); Stella Mary et al (2016). As reported by Uras et al (2012); Smider and Singh (2014), the excessive addition of Ca to soil could hinder the use of Mg and K except if it is added to soils suffering from Ca deficiency. Thus, argan biochar which contains low content of Ca can be worth considering as a soil amendment.…”

Section: Resultssupporting

confidence: 75%

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Biochar from argan shells: production and characterization

Bouqbis

Daoud

Koyro

et al. 2016

Int J Recycl Org Waste Agricult

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Section: Resultssupporting

confidence: 75%

“…The presence of salts and alkaline cations in the biochar are responsible for the highly pH and EC values. Because of the higher relative solubility of K containing salts and carbonates in water, the K contents of the biochars can have an effect on EC values (Uras et al 2012).…”

Section: Resultsmentioning

confidence: 99%

Biochar from argan shells: production and characterization

Bouqbis

Daoud

Koyro

et al. 2016

Int J Recycl Org Waste Agricult

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“…Higher amount of inorganics in biomass led to formation of char having low surface area due to the filling up pores by fusion of molten ash [28]. Similarly, due to the lower ash content, black wattle biochar showed higher surface area (241 g/m 2 ) than vineyard (92 g/m 2 ) [29]. Guerrero et al also observed that chars from rice husk devolatilization have lower surface areas compared with those from eucalyptus obtained under similar conditions [30].…”

Section: Char Propertiesmentioning

confidence: 99%

The effect of char properties on gasification reactivity

Duman

Uddin

Yanık

2014

Fuel Processing Technology

104

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In this study, CO 2 gasification of raw and acid-washed chars obtained from various types of lignocellulosic biomasses (woody and agricultural waste biomasses) was studied under isothermal conditions (850°C) using thermal gravimetric analysis. The effect of surface area and alkali/earth alkali metals on the reactivity of the chars was investigated. The different kinetic models were used to fit with the reactivity data by using least square method. The gasification of chars with higher surface area was found to be faster than that of chars having lower surface area. The acid treatment decreased the overall gasification rate for each raw chars. However, although the AI (alkali index) values of chars obtained from agricultural biomasses had equal or higher than that of woody biomass chars, their initial rates were considerably lower. It was concluded that indigenous alkali metals of chars have a remarkable influence of gasification reactivity but an adequate surface area should be provided to react with CO 2 .

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“…For KH2PO4, BC II and peat showed the higher value. Biochar, as reported by Coates, 2000, contain little or no NO3−, which is an essential nutrient for plant growth while the PO43-was characteristic for each feedstock (Uras et al, 2012). Given the high nutrient content of the three biochars, a significant positive effect on plant growth especially in the sandy soil was expected.…”

Section: Soil Peat and Biochar Propertiesmentioning

confidence: 73%

Characterization of pyrolysis products derived from three biological wastes and their effect on plant growth and soil water retention

et al. 2018

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Summary.Over two-thirds of Morocco can be classified as semiarid, arid and desert with low and variable rainfalls. While the country is subject to frequent drought, groundwater resources are predominantly consumed by irrigated agriculture leading to the depletion of water resources and degradation of soil quality. Application of bio-resources wastes to soils after pyrolysis process is well documented to help retain water and nutrients in soils. In this study, three bio-resources wastes derived from argan shells, wood chip, a blend of paper sludge and wheat husks are characterized for physical and chemical properties. To determine the potential impact of salt stress and toxic substances the second part of this study focused on the effect these bio-resources wastes have on germination of salad and barley respectively. The three bio-resources obtained from different biomass showed some unique properties compared to the soil, such as high electrical conductivity (EC), high content of K, Na and Mg, low content of heavy metals. Moreover, the water holding capacities increased with increasing application of bio-resources wastes. Concerning the phytotoxic tests, no negative effect was observed neither for salad (Lactuca sativa L.) nor for barley (Hordeum vulgare) indicating that the three bio-resources could be safely used for agriculture. Collectively, the use of these bio-resources wastes as a soil amendment is anticipated to increase both water and nutrient and could provide the potential for a better plant growth mainly in semiarid, arid and desert climatic conditions like the case of Morocco in which the agricultural practices reserve a majority of the water resources to be used for irrigation.

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Physico-chemical characterization of biochars from vacuum pyrolysis of South African agricultural wastes for application as soil amendments

Cited by 98 publications

References 39 publications

Biochar from argan shells: production and characterization

Biochar from argan shells: production and characterization

The effect of char properties on gasification reactivity

Characterization of pyrolysis products derived from three biological wastes and their effect on plant growth and soil water retention

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