Physicochemical properties of aged hydrochar in a rice-wheat rotation system: A 16-month observation

Wang, Bingyu; Fu, Haibin; Han, Lanfang; Xie, Huifang; Xue, Lihong; Feng, Yanfang; Xing, Baoshan

doi:10.1016/j.envpol.2020.116037

Cited by 20 publications

(16 citation statements)

References 37 publications

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“…The natural aging experiment was carried out at the Jiangsu Academy of Agricultural Sciences, Nanjing, Jiangsu Province, China (32°2′16″N, 118°51′58″E). According to a previous study, 20 g SLHC-A0 was subsequently placed in a 100-mesh size bag and buried below the soil surface at a 10 cm depth of soil column (30 cm in diameter, 50 cm in height) under a rice-wheat-rice rotation system for a natural aging experiment on July 12, 2018 (Wang et al 2021a). The mesh bag method guaranteed the SLHC layer as thin as possible (2-5 mm), facilitating more contact with the surrounding soil (Weyers and Spokas 2014).…”

Section: Natural Aging Of Sludge-derived Hydrocharmentioning

confidence: 99%

Unraveling natural aging-induced properties change of sludge-derived hydrochar and enhanced cadmium sorption site heterogeneity

Wang

Shang

Xie

et al. 2022

Biochar

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Hydrochar has potential applications in soil improvement and heavy metal remediation. Hydrochar would undergo the process of aging when introduced into the soil, altering its properties. However, recent studies have focused mainly on the artificial aging of hydrochar, which could not reveal the cumulative effect of multiple environmental factors. Therefore, the periodical monitoring of the property and sorption behavior of hydrochar after amending soils is necessary to better understand the multifaceted mechanisms associated with the natural aging of hydrochar. This study selected the sludge-derived hydrochar (SLHC) as a typical hydrochar and applied a 16-month rice–wheat–rice rotation to mimic the natural aging of hydrochar, focusing on changing properties and cadmium (Cd) sorption and literature contrast between aging strategies and biochar types. The porosity, O abundance, and ash content of 16-month aged SLHC increased by 37%, 47%, and 8.5%, respectively, facilitating Cd sorption due to surface complexation, pore sorption, and precipitation. The sorption percentage of Cd to SLHC was in the range of 11–14% for SLHC-A0 and increased to 17–31% for SLHC-A4 and 20–32% for SLHC-A16 after natural aging. The natural aging of SLHC induced by ash content played an essential role in Cd sorption site heterogeneity. Linear regression analysis showed that aging strategies on sorption behavior significantly differed between biochars. Thus, studies involving natural aging with multiple environmental factors are preferred over those involving chemical or biological aging. Future studies should continue to explore the mechanisms of natural aging-induced heavy metal sorption between hydrochar and pyrochar. These results improve insights to appraise the potential of SLHC as soil amendments to alleviate the adverse effects of heavy metal contamination and provide an essential basis for researchers and staff in soil management and environmental prevention. Graphical Abstract

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Section: Natural Aging Of Sludge-derived Hydrocharmentioning

confidence: 99%

Unraveling natural aging-induced properties change of sludge-derived hydrochar and enhanced cadmium sorption site heterogeneity

Wang

Shang

Xie

et al. 2022

Biochar

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“…However, with the aim of producing value-added materials by waste valorization, a circular economic development must be constructed for proven and emerging technologies. Hydrothermal treatment (HTT) is a promising alternative to produce a solid material, referred to as hydrochar, which is generated at lower temperatures (180-250 °C) than those used in pyrolysis [4]. Biowastes, such as sewage sludge, food waste, livestock manure, and agricultural waste are common feedstocks for biochar and hydrochar production [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Although hydrochar functionality is similar to biochar, its application must be evaluated and compared owing to its different physicochemical properties related to the operating conditions involved in its production. Hydrochar exhibits higher O/C and H/C ratios, thus lower aromaticity resulting in poorer stability when added to soil [4]. Hydrothermal treatment of biowaste performed in the temperature range of 150-200 °C results in filamentous structures with porous surfaces [13] and a high proportion of oxygen-containing functional groups that can enhance the soil water holding capacity (WHC), nutrient retention capacity, and cation exchange capacity (CEC) [14,15].…”

Section: Introductionmentioning

confidence: 99%

Effect of garden and park waste hydrochar and biochar in soil application: a comparative study

Suarez

Tobajas

Mohedano

et al. 2023

Biomass Conv. Bioref.

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The thermochemical treatments of biowaste yield alternative renewable carbon-rich materials, while achieving waste valorization. These technologies allow to reduce amount of biowaste and enhance its life span avoiding the landfill disposal. The agronomic application as a soil amendment strategy using fresh hydrochar (obtained via the hydrothermal treatment of garden and park waste (GPW) at 180 °C for 1 h), post-treated hydrochar (washed, aged, and thermally treated), and biochar (obtained via the pyrolysis of GPW at 900 °C for 90 min) has been studied and compared in order to stablish the best approach for its valorization. We evaluated the effects of mixing fresh hydrochar (1–5% on dry weight) with different peat-based growth substrates on the seed germination index as well as the fresh and dry weights of Arabidopsis thaliana, Chenopodium quinoa, and Solanum lycopersicum (tomato). We also performed a germination assay with marginal agricultural soil mixed with fresh and post-treated chars as well as biochar using the same doses. All carbonaceous materials complied with the European legal framework being categorized as a class A amendment and present a favorable chemical composition for their agronomic use, carbon sources with a low heavy-metal content, and a high mineral and organic matter content. Application of post-treated hydrochar to the agricultural marginal soil improved the germination index of tomato seeds (by 10–20%) at low dosages (< 3% on dry weight) when washed and thermally treated hydrochar was used. However, fresh hydrochar negatively affected seed germination and plant growth when applied to marginal soil and peat-based growth media, particularly sandy substrates. Washing improved the germination index (by approximately 18%), reduced 90% of the total volatile fatty acid content, and effectively removed furans, amines, amides, pyridines, pyrazines, benzoic compounds, and organic acids that can affect seed germination and plant growth. Because the use of hydrochar in soils for agricultural purposes requires post-treatment to alleviate germination and plant growth inhibition, washing is the most suitable option considering the energy and technological requirements.

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“…Hydrothermal carbonization is a highly efficient thermochemical pretreatment technology, converting biomass feedstocks in the presence of subcritical water (Alper et al, 2020). After biomass pretreatment, the energy density, grindability, hydrophobicity, and ease of storage will be greatly improved (Dai et al, 2019;Wang et al, 2020). The hydrochars derived from the hydrothermal carbonization process are being studied for biofuels (Sharma et al, 2020), sorption of pollutants , soil amendment (Wang et al, 2020), soil C sequestration (Baronti et al, 2017), and its potential in climate change mitigation (Owsianiak et al, 2018).…”

mentioning

confidence: 99%

“…After biomass pretreatment, the energy density, grindability, hydrophobicity, and ease of storage will be greatly improved (Dai et al, 2019;Wang et al, 2020). The hydrochars derived from the hydrothermal carbonization process are being studied for biofuels (Sharma et al, 2020), sorption of pollutants , soil amendment (Wang et al, 2020), soil C sequestration (Baronti et al, 2017), and its potential in climate change mitigation (Owsianiak et al, 2018). Based on the different heating methods, conventional hydrothermal carbonization (HC) and microwave-assisted hydrothermal carbonization (MHC) are under development.…”

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confidence: 99%

Valorization of tree leaves waste using microwave‐assisted hydrothermal carbonization process

et al. 2021

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Physicochemical properties of aged hydrochar in a rice-wheat rotation system: A 16-month observation

Cited by 20 publications

References 37 publications

Unraveling natural aging-induced properties change of sludge-derived hydrochar and enhanced cadmium sorption site heterogeneity

Unraveling natural aging-induced properties change of sludge-derived hydrochar and enhanced cadmium sorption site heterogeneity

Effect of garden and park waste hydrochar and biochar in soil application: a comparative study

Valorization of tree leaves waste using microwave‐assisted hydrothermal carbonization process

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