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  • Review
  • Open Access
57 Citations
7,143 Views
45 Pages

Recent Progress on Emerging Applications of Hydrochar

  • Md Tahmid Islam,
  • Al Ibtida Sultana,
  • Cadianne Chambers,
  • Swarna Saha,
  • Nepu Saha,
  • Kawnish Kirtania and
  • M. Toufiq Reza

9 December 2022

Hydrothermal carbonization (HTC) is a prominent thermochemical technology that can convert high-moisture waste into a valuable product (called hydrochar) at a relatively mild treatment condition (180–260 °C and 2–10 MPa). With rapidly...

  • Feature Paper
  • Review
  • Open Access
285 Citations
33,145 Views
19 Pages

Hydrochar: A Review on Its Production Technologies and Applications

  • Shima Masoumi,
  • Venu Babu Borugadda,
  • Sonil Nanda and
  • Ajay K. Dalai

2 August 2021

Recently, due to the escalating usage of non-renewable fossil fuels such as coal, natural gas and petroleum coke in electricity and power generation, and associated issues with pollution and global warming, more attention is being paid to finding alt...

  • Article
  • Open Access
32 Citations
5,128 Views
9 Pages

21 June 2019

As a treatment method of sewage sludge, the hydrothermal carbonization (HTC) process was adopted in this work. HTC has a great advantage considering the economic efficiency of its process operation due to its reduced energy consumption and production...

  • Article
  • Open Access
6 Citations
2,908 Views
19 Pages

7 November 2023

In this study, the aqueous photolytic degradation of the neonicotinoid pesticide clothianidin was studied in suspensions and aqueous extracts of hydrochar produced from olive kernels. A slight and nonsignificant decrease in the photodegradation rate...

  • Feature Paper
  • Article
  • Open Access
86 Citations
8,060 Views
22 Pages

Sewage Sludge Hydrochar: An Option for Removal of Methylene Blue from Wastewater

  • Roberta Ferrentino,
  • Riccardo Ceccato,
  • Valentina Marchetti,
  • Gianni Andreottola and
  • Luca Fiori

16 May 2020

Municipal sewage sludge was subjected to a hydrothermal carbonization (HTC) process for developing a hydrochar with high adsorption capacity for water remediation in terms of dye removal. Three hydrochars were produced from municipal sewage sludge by...

  • Article
  • Open Access
27 Citations
5,356 Views
16 Pages

24 March 2021

Waste seaweed that is collected at coastal regions of maritime provinces in Canada is creating ecological problems as it promotes an anoxic event, which produces nearly zero dissolved oxygen in water along with hydrogen sulfide emission. The work don...

  • Article
  • Open Access
7 Citations
2,607 Views
14 Pages

Characteristics of Hydrothermal Carbonization Hydrochar Derived from Cattle Manure

  • Eunhye Song,
  • Seyong Park,
  • Seongkuk Han,
  • Eusil Lee and
  • Ho Kim

4 December 2022

The characteristics of hydrothermal carbonization hydrochar derived from cattle manure including excrements and lignocellulosic biomass were analyzed. The effects of hydrothermal carbonization were evaluated by varying the reaction temperatures in th...

  • Article
  • Open Access
12 Citations
3,202 Views
16 Pages

Preparation of Biomass Hydrochar and Application Analysis of Blast Furnace Injection

  • Guangwei Wang,
  • Renguo Li,
  • Jiayun Dan,
  • Xiang Yuan,
  • Jiugang Shao,
  • Jiawen Liu,
  • Kun Xu,
  • Tao Li,
  • Xiaojun Ning and
  • Chuan Wang

22 January 2023

Hydrothermal carbonization (HTC) technology was used to carbonize and improve biomass raw material to obtain hydrochar. The effects of HTC temperature and holding time on the yield, composition, structure, combustion behavior, and safety of hydrochar...

  • Article
  • Open Access
12 Citations
3,791 Views
10 Pages

Effect of Biochar and Hydrochar on Forms of Aluminium in an Acidic Soil

  • Jorge Paz-Ferreiro,
  • María Luisa Álvarez-Calvo,
  • Cícero Célio de Figueiredo,
  • Ana-Maria Mendez and
  • Gabriel Gascó

5 November 2020

Biochars and hydrochars have a significant effect on soil properties linked to fertility or to carbon cycling and have been proposed as an amendment to increase soil productivity, particularly in acidic soils. Phytotoxic forms of aluminium (Al) are r...

  • Review
  • Open Access
20 Citations
7,108 Views
25 Pages

6 June 2024

Hydrochar, a carbonaceous material produced through hydrothermal carbonization of lignocellulosic biomass, has gained significant attention due to its versatile applications in agriculture, energy, and environmental protection. This review extensivel...

  • Article
  • Open Access
17 Citations
3,042 Views
17 Pages

Feasibility Analysis of Biomass Hydrochar Blended Coal Injection for Blast Furnace

  • Kai Wang,
  • Jianliang Zhang,
  • Shengli Wu,
  • Jianlong Wu,
  • Kun Xu,
  • Jiawen Liu,
  • Xiaojun Ning and
  • Guangwei Wang

31 August 2022

It is critical for the iron and steel industry to achieve green transformation and development by effectively utilizing abundant biomass resources in blast furnace ironmaking. In this paper, four types of typical biomass were carbonized and upgraded...

  • Article
  • Open Access
15 Citations
3,798 Views
16 Pages

Carbon materials, including hydrochar, can promote methane production from anaerobic digestion, and many previous studies have investigated the mechanism by analyzing changes in the microbial community. Based on the fact that the major functional mic...

  • Article
  • Open Access
34 Citations
7,039 Views
18 Pages

Hydrothermal Conversion of Neutral Sulfite Semi-Chemical Red Liquor into Hydrochar

  • Ramy Gamgoum,
  • Animesh Dutta,
  • Rafael M. Santos and
  • Yi Wai Chiang

3 June 2016

Hydrochar was produced from neutral sulfite semi-chemical (NSSC) red liquor as a possible bio-based solid fuel for use in power generation facilities. Hydrothermal conversion (HTC) experiments were conducted using a fixed liquor-to-water volume ratio...

  • Article
  • Open Access
1 Citations
744 Views
19 Pages

Agronomic Potential of Pyrochar and Hydrochar from Sewage Sludge: Effects of Carbonization Conditions

  • Libardo Mendoza-Geney,
  • Santiago Fonseca,
  • Fredy Bermudez-Aguilar,
  • María Martinez-Cordón,
  • Alexánder Gómez-Mejía and
  • Sonia Rincón-Prat

25 December 2025

Thermochemical treatments such as pyrolysis and hydrothermal carbonization (HTC) are increasingly used to convert municipal sewage sludge into solid products, offering benefits in contaminant reduction, pathogen sanitization, and nutrient recovery. T...

  • Article
  • Open Access
14 Citations
2,606 Views
17 Pages

Hydrochar derived from hydrothermal carbonization (HTC) has been recognized as a potential absorbent and horticultural substrate. However, its practical application has been limited due to its low adsorption capacity and negative effects on plant gro...

  • Review
  • Open Access
28 Citations
9,831 Views
44 Pages

Biomass Hydrochar: A Critical Review of Process Chemistry, Synthesis Methodology, and Applications

  • Joshua O. Ighalo,
  • Florence C. Akaeme,
  • Jordana Georgin,
  • Jivago Schumacher de Oliveira and
  • Dison S. P. Franco

17 February 2025

Hydrothermal carbonization (HTC) is a novel thermochemical process that turns biomass into hydrochar, a substance rich in carbon that has potential uses in advanced material synthesis, energy production, and environmental remediation. With an emphasi...

  • Article
  • Open Access
2 Citations
1,245 Views
11 Pages

Palladium Nanoparticles Anchored on Cellulose-Derived Amphiphilic Hydrochar for Pickering Interfacial Catalysis

  • Dandan Li,
  • Feichao Miao,
  • Jinhua Chen,
  • Zhibing Liu,
  • Zhiyuan Wang and
  • Yang Wang

26 January 2025

The development of Pickering interfacial catalysts for organic reactions in water is of great importance to the development of green chemistry. In this study, amphiphilic hydrochar was prepared by a simple urea-modified hydrothermal carbonization wit...

  • Article
  • Open Access
22 Citations
4,375 Views
10 Pages

Effect of Pyrochar and Hydrochar on Water Evaporation in Clayey Soil under Greenhouse Cultivation

  • Yang Liu,
  • Xiaoyu Liu,
  • Ni Ren,
  • Yanfang Feng,
  • Lihong Xue and
  • Linzhang Yang

Greenhouse cultivation consumes large volumes of freshwater, and excessive irrigation induces environmental problems, such as nutrient leaching and secondary salinization. Pyrochar (biochar from high-temperature pyrolysis) is an effective soil amendm...

  • Review
  • Open Access
1 Citations
1,678 Views
63 Pages

18 January 2026

Hydrothermal carbonization (HTC) represents a promising thermochemical method for converting wet biomass under moderate aqueous conditions into carbon-rich materials, characterized by specific attributes. Notwithstanding the increasing interest surro...

  • Article
  • Open Access
10 Citations
2,944 Views
14 Pages

Metagenomic Binning Revealed Microbial Shifts in Anaerobic Degradation of Phenol with Hydrochar and Pyrochar

  • Tao Luo,
  • Jun He,
  • Zhijian Shi,
  • Yan Shi,
  • Shicheng Zhang,
  • Yan Liu and
  • Gang Luo

Phenolic compounds, which are difficultly degraded, are one of the main toxic threats faced in the anaerobic digestion (AD) process. It has previously been reported that hydrochar/pyrochar produced by the hydrothermal liquefaction/pyrolysis of biomas...

  • Article
  • Open Access
14 Citations
2,885 Views
15 Pages

Applying Hydrochar Affects Soil Carbon Dynamics by Altering the Characteristics of Soil Aggregates and Microbes

  • Ting Yan,
  • Zherui Zhang,
  • Zhe Zhang,
  • Wenzan Wang,
  • Dong Li,
  • Tao Zhang and
  • Zhiping Zhu

10 May 2024

Hydrochar as a carbon-based fertiliser is hypothesised to permanently improve soils by modifying soil carbon quality through the regulation of soil organic carbon dynamics, aggregation properties and microbial diversity. However, the interactions bet...

  • Article
  • Open Access
20 Citations
4,202 Views
10 Pages

Preparation of Solid Fuel Hydrochar over Hydrothermal Carbonization of Red Jujube Branch

  • Zhiyu Li,
  • Weiming Yi,
  • Zhihe Li,
  • Chunyan Tian,
  • Peng Fu,
  • Yuchun Zhang,
  • Ling Zhou and
  • Jie Teng

18 January 2020

Biomass energy is becoming increasingly important, owing to the decreasing supply of fossil fuels and growing environmental problems. Hydrothermal carbonization (HTC) is a promising technology for producing solid biofuels from agricultural and forest...

  • Article
  • Open Access
2 Citations
1,000 Views
15 Pages

24 July 2025

Pyrochar has been identified as a favorable soil conditioner that can effectively ameliorate soil acidification. Hydrochar is considered a more affordable carbon material than pyrochar, but its effect on the process of soil acidification has yet to b...

  • Article
  • Open Access
9 Citations
3,724 Views
16 Pages

Effect of Acidic Hydrochar on Plastic Crude Oil Produced from Hydrothermal Liquefaction of Waste PVC

  • Vahab Ghalandari,
  • Hunter Smith,
  • Maurizio Volpe,
  • Antonio Messineo and
  • Toufiq Reza

29 November 2022

In this study, the effect of hydrothermal liquefaction (HTL) of waste PVC was investigated in the presence of acidic hydrochar. The hydrochar was prepared by hydrothermal carbonization of pineapple waste at 250 °C and at 1 h in the presence of ci...

  • Article
  • Open Access
16 Citations
3,153 Views
13 Pages

7 April 2022

To solve the energy crisis and slow down the greenhouse effect, it is urgent to find alternative energy sources for the iron and steel production process. Hydrochar is an auxiliary fuel and the only renewable carbon source that could reduce the injec...

  • Article
  • Open Access
4 Citations
2,317 Views
16 Pages

Hydrochar produced during the hydrothermal conversion of organic solid waste could enhance the anaerobic digestion (AD) efficiency of hydrothermal pre-treated sludge. However, there was still a lack of systematic research on the effect of hydrochar o...

  • Article
  • Open Access
25 Citations
3,355 Views
13 Pages

16 May 2022

Several studies have reported that the hydrothermal carbonization method (HTC) of agricultural waste is able to produce a solid residue with interesting properties for the adsorption of organic pollutants from contaminated water. This work represents...

  • Article
  • Open Access
3 Citations
2,407 Views
19 Pages

Industrial Two-Phase Olive Pomace Slurry-Derived Hydrochar Fuel for Energy Applications

  • Adnan Asad Karim,
  • Mᵃ Lourdes Martínez-Cartas and
  • Manuel Cuevas-Aranda

29 May 2024

The present study aims to resolve the existing research gaps on olive pomace (OP) hydrochars application as a fuel by evaluating its molecular structures (FTIR and solid NMR analysis), identifying influential characteristics (Pearson correlation anal...

  • Feature Paper
  • Article
  • Open Access
11 Citations
3,229 Views
13 Pages

The Effect of Residence Time during the Hydrothermal Carbonization Process of Sewage Sludge on the Properties of Hydrochar

  • Klaudia Czerwińska,
  • Joanna Mikusińska,
  • Aleksandra Błoniarz,
  • Maciej Śliz and
  • Małgorzata Wilk

10 July 2024

The optimal process conditions concerning the hydrothermal carbonization of digested sewage sludge are crucial to the economically effective technology needed to produce a solid product, hydrochar, for energy purposes. Accordingly, different residenc...

  • Article
  • Open Access
3 Citations
2,813 Views
18 Pages

Hydrothermal carbonization (HTC) technology converts biomass into a carbon-rich, oxygen-containing solid fuel. Most studies have focused on hydrochar produced under laboratory conditions, leaving a gap in understanding the performance of industrially...

  • Article
  • Open Access
19 Citations
4,637 Views
27 Pages

2 August 2022

The iron and steelmaking industry faces the dilemma of the need to decrease their greenhouse gas emissions to align with decarbonization goals, while at the same time fulfill the increasing steel demand from the growing population. Replacing fossil c...

  • Article
  • Open Access
25 Citations
4,389 Views
15 Pages

A Comprehensive Environmental Life Cycle Assessment of the Use of Hydrochar Pellets in Combined Heat and Power Plants

  • Ali Mohammadi,
  • G. Venkatesh,
  • Maria Sandberg,
  • Samieh Eskandari,
  • Stephen Joseph and
  • Karin Granström

30 October 2020

Hydrothermal carbonization (HTC) has been seen as a potentially beneficial process for converting wet biomass into value-added products. It is, however, necessary to overcome the challenges associated with handling the powdered form of hydrochar&mdas...

  • Article
  • Open Access
7 Citations
2,586 Views
15 Pages

Efficient Adsorption of Pollutants from Aqueous Solutions by Hydrochar-Based Hierarchical Porous Carbons

  • Marija Ercegović,
  • Jelena Petrović,
  • Marija Koprivica,
  • Marija Simić,
  • Mirko Grubišić,
  • Nikola Vuković and
  • Jugoslav Krstić

31 July 2024

Three-dimensional hierarchical porous carbons (HPCs) created through hydrothermal carbonization and the subsequent chemical activation of miscanthus were tested as adsorbents of Pb2+ and methylene blue from the aqueous solution. The HPC pore structur...

  • Article
  • Open Access
816 Views
18 Pages

Numerical Simulation Study of Blast Furnace Mixed Blown Pulverized Coal and Hydrochar

  • Xiaojun Ning,
  • Zheng Ren,
  • Guangze Kan,
  • Haibin Zhang,
  • Junyi Wu and
  • Guangwei Wang

9 September 2025

In order to alleviate the energy crisis and respond to the “dual carbon strategy”, a new energy substance is needed to replace pulverized coal as the new blast furnace blowing fuel. Hydrochar is a clean and renewable carbon resource with...

  • Article
  • Open Access
455 Views
12 Pages

10 February 2026

Hydrothermal carbonised waste (hydrochar) is increasingly considered a sustainable soil amendment within circular economy frameworks; however, its toxicity to the environment limits its safe application. Ageing and pyrolysis may be prospective treatm...

  • Article
  • Open Access
43 Citations
5,994 Views
16 Pages

Hydrothermal Carbonization of Sewage Sludge into Solid Biofuel: Influences of Process Conditions on the Energetic Properties of Hydrochar

  • Siti Zaharah Roslan,
  • Siti Fairuz Zainudin,
  • Alijah Mohd Aris,
  • Khor Bee Chin,
  • Mohibah Musa,
  • Ahmad Rafizan Mohamad Daud and
  • Syed Shatir A. Syed Hassan

5 March 2023

Hydrothermal carbonization (HTC) is an attractive, green technology for the management of sewage sludge. In this study, low-value secondary sewage sludge was subjected to an HTC treatment in a 1 L batch hydrothermal reactor and transformed into a hig...

  • Article
  • Open Access
11 Citations
4,824 Views
20 Pages

Removal of Arsenic from Wastewater Using Hydrochar Prepared from Red Macroalgae: Investigating Its Adsorption Efficiency and Mechanism

  • Aisha Khan Khanzada,
  • Muhammad Rizwan,
  • Hussein E. Al-Hazmi,
  • Joanna Majtacz,
  • Tonni Agustiono Kurniawan and
  • Jacek Mąkinia

6 November 2023

Arsenic (As) is a prominent carcinogen component produced via both geogenic and anthropogenic processes, posing serious risks to human health. This study aimed to investigate the potential of hydrochar prepared from red macroalgae for removing As fro...

  • Article
  • Open Access
5 Citations
1,655 Views
15 Pages

6 October 2024

Hydrochar, an attractive member of the carbonaceous materials, is derived from biomass and projects great potential in peroxymonosulfate (PMS) activation, but has not been studied much. Herein, by using the large-scale cultured Chlorella vulgaris and...

  • Feature Paper
  • Article
  • Open Access
19 Citations
6,247 Views
14 Pages

Removal of Escherichia coli by Intermittent Operation of Saturated Sand Columns Supplemented with Hydrochar Derived from Sewage Sludge

  • Jae Wook Chung,
  • Oghosa Charles Edewi,
  • Jan Willem Foppen,
  • Gabriel Gerner,
  • Rolf Krebs and
  • Piet Nicolaas Luc Lens

15 August 2017

Hydrothermal carbonization (HTC) technology can convert various types of waste biomass into a carbon-rich product referred to as hydrochar. In order to verify the potential of hydrochar produced from stabilized sewage sludge to be an adsorbent for ba...

  • Article
  • Open Access
7 Citations
3,200 Views
16 Pages

Occurrence of Polycyclic Aromatic Hydrocarbons (PAHs) in Pyrochar and Hydrochar during Thermal and Hydrothermal Processes

  • Hwang-Ju Jeon,
  • Donghyeon Kim,
  • Fabiano B. Scheufele,
  • Kyoung S. Ro,
  • Judy A. Libra,
  • Nader Marzban,
  • Huan Chen,
  • Caroline Ribeiro and
  • Changyoon Jeong

6 September 2024

Pyrochar (Biochar) produced from the thermochemical conversion of biomass has been widely used as a soil amendment to improve agricultural soil quality. Since polycyclic aromatic hydrocarbons (PAHs) can be produced in such processes, the occurrence o...

  • Article
  • Open Access
20 Citations
3,470 Views
26 Pages

Study on the Effect of Hydrothermal Carbonization Parameters on Fuel Properties of Chicken Manure Hydrochar

  • Małgorzata Hejna,
  • Kacper Świechowski,
  • Waheed A. Rasaq and
  • Andrzej Białowiec

13 August 2022

Economic development and population growth lead to the increased production of chicken manure, which is a problematic organic waste in terms of its amount, environmental threats, and moisture content. In this study, hydrothermal carbonization, an eme...

  • Article
  • Open Access
68 Citations
6,622 Views
16 Pages

Hydrothermal Carbonization of Municipal Woody and Herbaceous Prunings: Hydrochar Valorisation as Soil Amendment and Growth Medium for Horticulture

  • Monica Puccini,
  • Lucia Ceccarini,
  • Daniele Antichi,
  • Maurizia Seggiani,
  • Silvia Tavarini,
  • Marisa Hernandez Latorre and
  • Sandra Vitolo

16 March 2018

In this study, we investigate the suitability of hydrochar, produced at industrial scale by hydrothermal carbonization of municipal woody and herbaceous prunings, to be used as soil amendment and peat substitute in organic growth medium for horticult...

  • Article
  • Open Access
2 Citations
1,302 Views
17 Pages

3 September 2025

In order to investigate the formation pathway of hydrochar during hydrothermal carbonization (HTC) and to identify the optimal process conditions for producing high-quality pyrolysis feedstock, the effect of hydrothermal temperature (220, 250, and 28...

  • Article
  • Open Access
13 Citations
2,795 Views
21 Pages

Sorption of Mercury in Batch and Fixed-Bed Column System on Hydrochar Obtained from Apple Pomace

  • Krzysztof Szostak,
  • Gabriela Hodacka,
  • Olga Długosz,
  • Jolanta Pulit-Prociak and
  • Marcin Banach

18 October 2022

This paper presents the methodology for the preparation of hydrochar obtained from waste materials of natural origin and investigates its applicability for removing mercury ions from aqueous systems. The sorption properties of the obtained hydrochar...

  • Article
  • Open Access
13 Citations
4,168 Views
19 Pages

10 September 2023

Wheat straw, which is a carbon-rich precursor and a common agriculture waste in Sanandaj, was modified to produce hydrochar with high adsorption capacity by the hydrothermal carbonization (HTC) method. The hydrochars were tested as adsorbents to remo...

  • Article
  • Open Access
7 Citations
3,234 Views
11 Pages

Feasibility Study of Bio-Sludge Hydrochar as Blast Furnace Injectant

  • Wang Liang,
  • Pavlina Nanou,
  • Heather Wray,
  • Jianliang Zhang,
  • Ingemar Lundstrom,
  • Stefan Lundqvist and
  • Chuan Wang

Hydrothermal treatment can convert paper mill biological (bio-) sludge waste into more energy-dense hydrochar, which can achieve energy savings and fossil CO2 emissions reduction when used for metallurgical applications. This study assesses the basic...

  • Feature Paper
  • Article
  • Open Access
24 Citations
4,925 Views
34 Pages

2 September 2022

Hydrochars are an alternative form of biochar produced by hydrothermal carbonisation (HTC), a potentially cheaper and greener method. In this paper, the effect of multiple variables on hydrochar properties was investigated. Waste biomass was converte...

  • Article
  • Open Access
9 Citations
2,241 Views
20 Pages

27 November 2023

Hydrochar is considered to be a good adsorbent for the separation of metal ions from aqueous solutions. However, the yield of hydrochar from raw straw is generally low, because the hydrothermal carbonization occurs via dehydration, polymerization, an...

  • Article
  • Open Access
14 Citations
2,094 Views
17 Pages

2 August 2023

Modified persimmon peel–montmorillonite composites (PMHC-KOH/NaHCO3) for efficient and rapid removal of methylene blue (MB) were synthesized using hydrothermal carbonization and simple alkali impregnation. The surface properties and material co...

  • Article
  • Open Access
3 Citations
2,771 Views
13 Pages

11 February 2025

Extensive research has been conducted on the application of pyrolysis and hydrothermal carbonization (HTC) biochar for soil amendment. However, hydrochar from hydrothermal liquefaction (HTL) has received little attention regarding its potential for s...

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