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Biochar ash

Manuel Raul Pelaez-Samaniego, Matt W Smith, Quanbao Zhao, Tsai Garcia-Perez, Craig Frear, Manuel Garcia-Perez
Anaerobically digested fibrous solid (AD fiber) is an abundant material that offers potential to produce value-added products such as biochar. The objective of this paper is to better understand how thermochemical processing conditions affect the capacity of biochars derived from AD fiber to adsorb H2 S from biogas. AD fiber was pyrolyzed in an electric tube reactor at temperatures up to 600 °C and 60 min. The chars were employed for H2 S scrubbing tests from a synthetic biogas. Results showed that the chars' capacity for H2 S removal is comparable to that of activated carbon...
March 10, 2018: Waste Management
Abdelhafid Ahmed Dugdug, Scott X Chang, Yong Sik Ok, Anushka Upamali Rajapaksha, Anthony Anyia
Biochar is recognized as an effective material for recovering excess nutrients, including phosphorus (P), from aqueous solutions. Practically, that benefits the environment through reducing P losses from biochar-amended soils; however, how salinity influences P sorption by biochar is poorly understood and there has been no direct comparison on P sorption capacity between biochars derived from different feedstock types under non-saline and saline conditions. In this study, biochars derived from wheat straw, hardwood, and willow wood were used to compare P sorption at three levels of electrical conductivity (EC) (0, 4, and 8 dS m-1) to represent a wide range of salinity conditions...
February 10, 2018: Environmental Science and Pollution Research International
Yasser Mahmoud Awad, Yong Sik Ok, Jens Abrigata, Jingzi Beiyuan, Felix Beckers, Daniel C W Tsang, Jörg Rinklebe
To date, no investigation has been carried out to explore the effects of biochars produced at different pyrolysis temperatures on the dynamics of redox potential (EH) and pH in a contaminated floodplain soil. Thus, we aimed to quantify the dynamics of EH and pH in contaminated flooded soils treated with 70tha-1 of pine sawdust biomass (S&BM) and biochars pyrolyzed at 300°C (S&BC300) and 550°C (S&BC550) and pre-incubated for 105days in an automated biogeochemical microcosm system. Microbial community composition was also determined via analyzing phospholipid fatty acid (PLFA)...
December 27, 2017: Science of the Total Environment
Peng Zhang, Hongwen Sun, Chao Ren, Lujuan Min, Huiming Zhang
To elucidate the sorption affinity of biochars for neonicotinoid pesticides and the influence of biochar structure on sorption mechanisms therein, 24 biochar samples were obtained by pyrolyzing maize straw and pig manure at pyrolyzing temperatures (PTs) of 200-700 °C and by further deashing them using acids, and the sorption of three typical neonicotinoids, imidacloprid, clothianidin and thiacloprid on untreated and acid-deashed biochars were evaluated. All the biochar samples could efficiently adsorb the three neonicotinoids and multiple mechanisms were involved in sorption...
December 13, 2017: Environmental Pollution
Lanfang Han, Kyoung S Ro, Yu Wang, Ke Sun, Haoran Sun, Judy A Libra, Baoshan Xing
Assessing biochar's ability to resist oxidation is fundamental to understanding its potential to sequester carbon. Chemical oxidation exhibits good performance in estimating the oxidation resistance of biochar. Herein, oxidation resistance of 14 types of biochars produced from four feedstocks at different pyrolysis conditions (hydrothermal versus thermal carbonization) was investigated via hydrogen peroxide oxidation with varying concentrations. The oxidation resistance of organic carbon (C) of hydrochars was relatively higher than that of 250°C pyrochars (P250) but was comparable to that of 450°C pyrochars (P450)...
March 2018: Science of the Total Environment
Andrzej Białowiec, Jakub Pulka, Paweł Stępień, Piotr Manczarski, Janusz Gołaszewski
The influence of Refuse Derived Fuel (RDF)/Solid Recovery Fuel (SRF) torrefaction temperature on product characteristic was investigated. RDF/SRF thermal treatment experiment was conducted with 1-h residence time, under given temperatures: 200, 220, 240, 260, 280 and 300°C. Sawdust was used as reference material. The following parameters of torrefaction char from sawdust and Carbonized Refuse Derived Fuel (CRDF) from RDF/SRF were measured: moisture, calorific value, ash content, volatile compounds and sulfur content...
December 2017: Waste Management
Dongfang Wang, Guilong Zhang, Linglin Zhou, Dongqing Cai, Zhengyan Wu
Livestock manure (Man) commonly contains a certain quantity of heavy metal ions, such as arsenic (As) and copper (Cu) ions, resulting in a high risk on soil contamination. To solve this problem, heavy metal of manure was immobilized into sodium carbonate/biosilica/attapulgite composite (Na2CO3/BioSi/Attp), which was developed using a nanocomposite consisting of anhydrous sodium carbonate (Na2CO3), straw ash-based biochar and biosilica (BioSi), and attapulgite (Attp). When Na2CO3/BioSi/Attp was mixed with Man/AsCu, the obtained nanocomposite (Na2CO3/BioSi/Attp/Man/AsCu) with a porous nano-network structure could effectively control the release of As and Cu ions from manure through adsorption and chemical reaction...
October 4, 2017: Journal of Agricultural and Food Chemistry
Divine Damertey Sewu, Patrick Boakye, Hwansoo Jung, Seung Han Woo
The potential of activating terrestrial biomass (spent mushroom substrate, SMS) with ash-laden marine biomass [kelp seaweed, KE] via co-pyrolysis in the field of adsorption was first investigated. KE biochar (KBC), SMS biochar (SMSBC), biochar (SK10BC) from 10%-KE added SMS, and biochar (ESBC) from KE-extract added SMS were used for the adsorption of cationic dye crystal violet (CV). ESBC had highest fixed carbon content (70.60%) and biochar yield (31.6%). SK10BC exhibited high ash content, abundant functional groups, coarser surface morphology and Langmuir maximum adsorptive capacity (610...
November 2017: Bioresource Technology
Guanyi Chen, Xiang Guo, Zhanjun Cheng, Beibei Yan, Zeng Dan, Wenchao Ma
Digestate is a byproduct from biomass anaerobic digestion process. Gasification of dried digestate to produce gasesous product might be a promising route. In this work, air gasification of digestate with high ash content was performed in a downdraft fixed bed gasifier at temperature varying from 600°C to 800°C and air equivalence ratio (ER) ranging from 0.25 to 0.30. The ash melting properties were firstly detected by the Intelligent Ash Melting Point Test, and the by-products (biochar and ash) were analyzed...
August 22, 2017: Waste Management
Yong Yi Teh, Keat Teong Lee, Wei-Hsin Chen, Shih-Cheng Lin, Herng-Kuang Sheen, Inn Shi Tan
This study aims to produce biochar and sugars from a macroalga Eucheuma denticulatum using dilute sulfuric acid hydrolysis along with microwave-assisted heating. The reactions were operated at sulfuric acid concentrations of 0.1 and 0.2M, reaction temperatures of 150-170°C and a heating time of 10min. Compared to the raw macroalga, biochar qualities were improved with increased carbon content and lower ash and moisture contents. The calorific value of the biochar could be intensified up to 45%, and 39% of energy yield was recovered...
July 21, 2017: Bioresource Technology
Kateřina Břendová, Jiřina Száková, Miloslav Lhotka, Tereza Krulikovská, Miroslav Punčochář, Pavel Tlustoš
Biochar application is a widely investigated topic nowadays, and precisely described biochar parameters are key information for the understanding of its behaviour in soil and other media. Pore structure and surface properties determine biochar fate. However, there is lack of complex, investigative studies describing the influence of biomass properties and pyrolysis conditions on the pore structure of biochars. The aim of our study was to evaluate a wide range of gathered agriculture residues and elevated pyrolysis temperature on the biochar surface properties and pore composition, predicting biochar behaviour in the soil...
December 2017: Environmental Geochemistry and Health
Wenqin Li, Qi Dang, Robert C Brown, David Laird, Mark M Wright
This study evaluated the impact of biomass properties on the pyrolysis product yields, economic and environmental performance for the pyrolysis-biochar-bioenergy platform. We developed and applied a fast pyrolysis, feedstock-sensitive, regression-based chemical process model to 346 different feedstocks, which were grouped into five types: woody, stalk/cob/ear, grass/plant, organic residue/product and husk/shell/pit. The results show that biomass ash content of 0.3-7.7wt% increases biochar yield from 0.13 to 0...
October 2017: Bioresource Technology
Maria Pukalchik, Filip Mercl, Maria Panova, Kateřina Břendová, Vera A Terekhova, Pavel Tlustoš
Nowadays trace metal contamination of soils represents an important environmental hazard. Nevertheless, the use of some secondary waste products as amendments may restore the common soil functions. This paper focuses on the chemical and biological influence of wood biochar (BC), wood ash (WA) and humic substances (HS), alone and in the mixtures, on a heavily multi-contaminated sandy loam soil. The soil was amended by above-mentioned materials to follow a pH-increasing design (pHCa from 6.0 to 6.5, 7.0 and 7...
October 2017: Environmental Pollution
Lu Lin, Wenbin Jiang, Pei Xu
The synergistic impact of salts and organic matter on adsorption of ibuprofen and sulfamethoxazole by three types of biochar and an activated carbon was investigated using reclaimed water reverse osmosis (RO) concentrate and synthetic solutions spiked with target organic compounds and non-target water constituents (e.g., Na(+), Ca(2+), Mg(2+), K(+), Cl(-), SO4(2-), alkalinity, humic acid (HA), and bovine serum albumin (BSA)). Kinetic modeling was used to better understand the adsorption process between the carbon adsorbents and pharmaceuticals and to elucidate the impact of water chemistry on pharmaceuticals adsorption...
December 1, 2017: Science of the Total Environment
Rimena R Domingues, Paulo F Trugilho, Carlos A Silva, Isabel Cristina N A de Melo, Leônidas C A Melo, Zuy M Magriotis, Miguel A Sánchez-Monedero
Biochar production and use are part of the modern agenda to recycle wastes, and to retain nutrients, pollutants, and heavy metals in the soil and to offset some greenhouse gas emissions. Biochars from wood (eucalyptus sawdust, pine bark), sugarcane bagasse, and substances rich in nutrients (coffee husk, chicken manure) produced at 350, 450 and 750°C were characterized to identify agronomic and environmental benefits, which may enhance soil quality. Biochars derived from wood and sugarcane have greater potential for improving C storage in tropical soils due to a higher aromatic character, high C concentration, low H/C ratio, and FTIR spectra features as compared to nutrient-rich biochars...
2017: PloS One
Jessica L Linville, Yanwen Shen, Patricia A Ignacio-de Leon, Robin P Schoene, Meltem Urgun-Demirtas
A modified version of an in-situ CO2 removal process was applied during anaerobic digestion of food waste with two types of walnut shell biochar at bench scale under batch operating mode. Compared with the coarse walnut shell biochar, the fine walnut shell biochar has a higher ash content (43 vs. 36 wt%) and higher concentrations of calcium (31 vs. 19 wt% of ash), magnesium (8.4 vs. 5.6 wt% of ash) and sodium (23.4 vs. 0.3 wt% of ash), but a lower potassium concentration (0.2 vs. 40% wt% of ash). The 0.96-3...
June 2017: Waste Management & Research
Chao-Yi Hung, Wen-Tien Tsai, Jie-Wei Chen, Yu-Quan Lin, Yuan-Ming Chang
In the study, the biogas digestate was evaluated as a potential feedstock for preparing biochars at a broad temperature range of 300-900°C. The physico-chemical and pore properties of the resulting biochars (denoted as SDBC, solid digestate biochar), including calorific value (higher heating value), surface area/pore volume/pore size distribution, true density, scanning electron microscopy - energy dispersive X-ray spectroscopy (SEM-EDS) and X-ray powder diffraction (XRD), were studied. It was found that the higher heating values of the SDBC products were on a decreasing trend as pyrolysis temperature increased, but they indicated an increase in true density...
May 6, 2017: Waste Management
Chao Zhang, Baoqing Shan, Wenzhong Tang, Yaoyao Zhu
Phyllostachys pubescens (PP) biochars produced under a low oxygen pyrolysis atmosphere (oxygen content 1-4%) were prepared as sorbents for investigating the mechanisms of cadmium and lead sorption. A low-oxygen pyrolysis atmosphere increased biochar ash and specific surface area, promoting heavy metal precipitation and complexation. The maximum sorption capacity (Qm) of Pb(2+) obtained from the Langmuir model was 67.4mg·g(-1), while Qm of Cd(2+) was 14.7mg·g(-1). The contribution of each mechanism varied with increasing oxygen content at a low pyrolysis temperature...
August 2017: Bioresource Technology
Xin Jiat Lee, Lai Yee Lee, Suyin Gan, Suchithra Thangalazhy-Gopakumar, Hoon Kiat Ng
This research investigated the potential of palm kernel shell (PKS), empty fruit bunch (EFB) and palm oil sludge (POS), abundantly available agricultural wastes, as feedstock for biochar production by slow pyrolysis (50mLmin(-1) N2 at 500°C). Various characterization tests were performed to establish the thermochemical properties of the feedstocks and obtained biochars. PKS and EFB had higher lignin, volatiles, carbon and HHV, and lower ash than POS. The thermochemical conversion had enhanced the biofuel quality of PKS-char and EFB-char exhibiting increased HHV (26...
July 2017: Bioresource Technology
Elizabeth Verhoeven, Engil Pereira, Charlotte Decock, Emma Suddick, Teri Angst, Johan Six
Through meta-analysis, we synthesize results from field studies on the effect of biochar application on NO emissions and crop yield. We aimed to better constrain the effect of biochar on NO emissions under field conditions, identify significant predictor variables, assess potential synergies and tradeoffs between NO mitigation and yield, and discuss knowledge gaps. The response ratios for yield and NO emissions were weighted by one of two functions: (i) the inverse of the pooled variance or (ii) the inverse of number of observations per field site...
March 2017: Journal of Environmental Quality
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