Plant and soil responses to hydrothermally converted sewage sludge (sewchar)

Melo, Tatiane Medeiros; Bottlinger, Michael; Schulz, Elke; Leandro, Wilson Mozena; Filho, Adelmo Menezes de Aguiar; Wang, Hailong; Ok, Yong Sik; Rinklebe, Jörg

doi:10.1016/j.chemosphere.2018.04.178

Cited by 59 publications

(28 citation statements)

References 57 publications

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“…For oxisol, although no statistical difference was verified, a decrease in the shoot dry matter was observed for both application rates evaluated. Similar results were achieved by Melo et al [69] for the first harvest of bean cultivation in soils with the addition of 4, 8, 16 and 32 t ha −1 of hydrochar. However, positive effects were observed in relation to dry mass for the second harvest, for which the application rate of 16 t ha −1 provided a 96% increase in biomass compared to soil without application of hydrochar [69].…”

Section: Evaluation Of Maize Growth In Soil With Hydrocharsupporting

confidence: 88%

Hydrochar from sugarcane industry by-products: assessment of its potential use as a soil conditioner by germination and growth of maize

Fregolente

Santos

Mazzati

et al. 2021

Chem. Biol. Technol. Agric.

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Background Hydrothermal carbonization (HTC) is a thermochemical process to convert biomass in carbon-rich materials (hydrochar). The use of sugarcane industry by-products in HTC has been evaluated, generating a hydrochar rich in nutrients, which could be used as a soil conditioner. We raised the hypothesis that the application of hydrochar in soil can improve its nutrient characteristics, bringing a better environment and favouring plant growth, expecting a development similar to that one observed in anthropogenic soils. Results Germination studies were performed expecting a species-dependent response, using maize and tomato seeds, whose development was assessed in two soluble fractions obtained from hydrochar aiming to evaluate different rhizosphere conditions. The results showed a better development of maize, especially in the aqueous soluble fraction, whose nutrient concentration was lower than that of the acid soluble fraction, as well as the organic composition. Maize growth in soils showed a better initial development in ultisol compared to oxisol, this being inferred by root:shoot biomass ratio and by scanning electron microscopy (SEM) images. However, the development of maize was better in anthropogenic soil compared to soils that received hydrochar. Conclusion The maize growth, compared with that carried out in anthropogenic soil, suggests that during the period evaluated the addition of hydrochar in soil did not have a negative effect upon maize development in its initial phase, and could have even favoured rooting in ultisol.

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Section: Evaluation Of Maize Growth In Soil With Hydrocharsupporting

confidence: 88%

Hydrochar from sugarcane industry by-products: assessment of its potential use as a soil conditioner by germination and growth of maize

Fregolente

Santos

Mazzati

et al. 2021

Chem. Biol. Technol. Agric.

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“…The quality of SOM can also be influenced by HA and FA content. Undisturbed soils contain a higher content of the more stable HA fraction, whereas the FA fraction is more labile and more susceptible to changes into the soil (Melo et al, 2018). The decreased HA/FA ratio is due to litter decomposition and mineralization of SOM during the rainy season influencing C mobility in the legume soil.…”

Section: Discussionmentioning

confidence: 99%

Legume silvopastoral systems enhance soil organic matter quality in a subhumid tropical environment

Lira

Fracetto

Ferreira

et al. 2020

Soil Science Soc of Amer J

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The silvopastoral system avoids the degradation of tropical grasslands by providing essential nutrients to the soil while improving livestock diet and farmer's income by increasing the marketable wood supply. We hypothesize that intercropping shrub‐tree legumes into signalgrass increases microbial activity and soil organic matter (SOM) quality. We investigated silvopastoral system soils over 5 yr in a subhumid climate in northeastern Brazil to determine the total C and N contents and to estimate C‐microbial biomass and respiration, microbial and metabolic quotients, humic acid (HA), and fulvic acid (FA). The experimental design evaluated (a) signalgrass intercropped with gliricidia at 0, 4, and 8 m from the center of the double legume row; (b) signalgrass intercropped with sabia at 0, 4, and 8 m from the center of the double legume row; and (c) single signalgrass. Samples were obtained after 2, 3, 4, and 5 yr from silvopastoral system implementation. The shrub‐tree legumes soils had total C (39 g kg−1) and total N (3.8 g kg−1) contents significantly higher (30 and 72%, respectively) than single signalgrass soil only on the fifth year after establishment. Microbial biomass C at 0 and 4 m from the legume's rows was 700 mg kg−1, which was 75% higher than single signalgrass soils. There was strong microbial respiration (∼50 mg C‐CO2 kg−1 d−1) in legumes soils, but the metabolic quotient did not indicate disturbance in microbial activity. The microbial quotients were significantly higher in shrub‐tree legumes soil, and the HA/FA ratio was nearly 1, demonstrating greater efficiency in SOM decomposition by microbial activity. Overall, 5 yr after establishment, the silvopastoral system has improved SOM quality and contributed to grassland sustainability.

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“…There is a wide range of studies examining the HTC of sewage sludge (Tasca et al 2019), biogas digestate (Rodriguez Correa et al 2017), paper mill sludge (Mäkelä et al 2015;Mäkelä and Yoshikawa 2016), human excrement (Fakkaew et al 2018), chicken litter, and swine manure (Ro et al 2018;Zhou et al 2019) for energy applications (Fakkaew et al 2018;Ro et al 2018;Zhou et al 2019) and soil amendments (Melo et al 2018). In general, HTC reduces the water content of these solid materials, while concentrating insoluble inorganic species (ash) (Gasco et al 2018;Tasca et al 2019;Zhou et al 2019).…”

Section: Introductionmentioning

confidence: 99%

The impact of hydrothermal carbonization on the surface functionalities of wet waste materials for water treatment applications

Niinipuu

Latham

Boily

et al. 2020

Environ Sci Pollut Res

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Hydrothermal carbonization (HTC) is an energy-efficient thermochemical process for converting wet waste products into value added materials for water treatment. Understanding how HTC influences the physicochemical properties of the resultant materials is critical in optimizing the process for water treatment, where surface functionality and surface area play a major role. In this study, we have examined the HTC of four wet waste streams, sewage sludge, biosludge, fiber sludge, and horse manure at three different temperatures (180°C, 220°C, and 260°C). The physicochemical properties of these materials were examined via FTIR, SEM and BET with their adsorption capacity were assessed using methylene blue. The yield of solid material after hydrothermal carbonization (hydrochar) decreased with increasing temperature for all samples, with the largest impact on horse manure and fiber sludge. These materials also lost the highest degree of oxygen, while HTC had minimal impact on biosludge and sewage sludge. The differences here were due to the varying compositions of each waste material, FTIR identified resonances related to cellulose in horse manure and fiber sludge, which were not detected in biosludge and sewage sludge. Adsorption capacities varied between 9.0 and 68 mg g −1 with biosludge HTC at 220°C adsorbing the highest amount. Adsorption also dropped drastically at the highest temperature (260°C), indicating a correlation between adsorption capacity and HTC conditions. This was attributed to the loss of oxygen functional groups, which can contribute to adsorption. These results suggest that adsorption properties can be tailored both by selection of HTC temperature and feedstock.

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Plant and soil responses to hydrothermally converted sewage sludge (sewchar)

Cited by 59 publications

References 57 publications

Hydrochar from sugarcane industry by-products: assessment of its potential use as a soil conditioner by germination and growth of maize

Hydrochar from sugarcane industry by-products: assessment of its potential use as a soil conditioner by germination and growth of maize

Legume silvopastoral systems enhance soil organic matter quality in a subhumid tropical environment

The impact of hydrothermal carbonization on the surface functionalities of wet waste materials for water treatment applications

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