Physico-chemical properties and nutrient content of some slow pyrolysis biochars produced from different feedstocks

Piash, Mahmudul Islam; Hossain, Faruque M.; Parveen, Zakia

doi:10.3329/bjsr.v29i2.32327

Cited by 22 publications

(26 citation statements)

References 14 publications

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“…This pH value was less than the findings by [14] for biochar prepared from holm oak, which was pyrolyzed at 650 • C, but greater than the finding by [13] for biochar prepared from Eucalyptus grandis pyrolyzed at 300-450 • C. The results also showed that khat straw biochar has high organic matter (88.4%) as well as major nutrients such as total nitrogen (1.50%), phosphorous (0.40%), potassium (0.26%), calcium (6.4 g/kg), and magnesium (2.3 g/kg) contents with low levels of trace metals. These results were within the range of the values found by [36], in which biochars were pyrolyzed from six feedstocks types, the nutrient contents (%) ranged as total organic carbon from 34.96 to 48.93, N from 0.56 to 2.00, P from 0.49 to 2.49, and K from 1.41 to 7.49. Wu et al [24] also reported that the rice straw-derived biochars produced at 400 • C had high pH (10.1) and cation exchange capacity (57.2 cmol/kg) and high levels of available phosphorus (830 mg/kg) and extractable cations, which were higher than the values from our observation.…”

Section: The Physicochemical Properties Of Khat Straw Biocharsupporting

confidence: 87%

Co-Composting of Khat-Derived Biochar with Municipal Solid Waste: A Sustainable Practice of Waste Management

et al. 2020

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Biochar is a way to improve the performance of the composting process and the quality of compost. This study was aimed to investigate the optimum ratio of khat straw (Catha edulis) biochar and organic municipal solid waste mixtures to improve the quality of the resulting co-composts. Khat-derived biochar during pyrolysis at 350 °C was added to organic municipal solid waste mix and four co-composting treatments were prepared with the compositions (% w/w): control compost (no biochar) and 5%, 15%, and 25% co-composted biochar in three replicates. The total organic carbon, organic matter, total nitrogen, available phosphorus, and potassium values ranged as 16.76–21.45%, 30.77–40.26%, 0.97–1.68%, 0.58–0.76%, and 12.72–15.29%, respectively. The results confirmed that 5% and 15% co-composted khat biochars had significantly reduced (p < 0.05) organic matter loss and increased the contents of cation exchange capacity, pH, phosphorous, potassium, calcium, magnesium, and zinc compared to the control compost, while some heavy metals (Fe, Cu, and Mn) and EC values in co-composted biochars are lower than the control compost. Khat-derived biochar could be added to municipal organic waste mix at 5–15% (w/w) in order to get better quality of compost, which can be used as biofertilizer.

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Section: The Physicochemical Properties Of Khat Straw Biocharsupporting

confidence: 87%

Co-Composting of Khat-Derived Biochar with Municipal Solid Waste: A Sustainable Practice of Waste Management

et al. 2020

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“…Total P and K content of DOW biochar were also higher than its counterpart (Table 1). The results indicate that, in general, DOW biochar has better agronomic values than farmyard manure biochar which is in line with the findings of Piash et al [35].…”

Section: Resultssupporting

confidence: 90%

Impact of MgCl<sub>2</sub> Modified Biochar on Phosphorus and Nitrogen Fractions in Coastal Saline Soil

Lutfunnahar¹,

Piash²,

Rahman³

2021

OJSS

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Biochar application is claimed to improve nutrient availability in many problem soils; however, pristine biochars are often reported to produce inconsistent results. Therefore, appropriate biochar modification techniques are required to retain soil nutrients at an optimum level. To increase Nitrogen (N) and Phosphorus (P) availability in coastal saline soil, two slow pyrolyzed biochars viz domestic organic waste (DWB) and farmyard manure (FMB) were modified with MgCl 2 . Ten different treatments comprising the biochars (pristine and modified) with and without the recommended fertilizer were applied (2% w/w) to the soil and incubated for ninety days. The soils were analyzed for pH, EC, available 4 NH + , 3 NO − and different phosphorus fractions sequentially extracted by NH 4 Cl, NaHCO 3 , NaOH, and HCl. During the incubation period, biochar treatments increased all phosphorus and nitrogen fractions than the control and recommended fertilizer treatment. The application of FMB significantly (p < 0.05) increased NH 4 Cl, NaHCO 3 , and NaOH extractable P fractions from DWB, while HCl soluble fraction was enhanced (p > 0.05) by DWB. The increased Al and/or Fe bound phosphate after 60 days of incubation had significant correlations to decreasing soil pH and NaHCO 3 -P, indicating reduced availability with time. Further Mg modification slightly increased P availability only after 60 days of incubation. The modification also improved both nitrogen fractions but significantly (p < 0.05) increased the NO 3 -N content which could be the result of electrostatic attraction between Mg 2+ and 3 NO − ions. Overall, Mg-modified biochar may retain both phosphates and nitrates in soil. However, the magnitude of retention will vary depending on biochar type, nutrient species, and aging in soil.

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“…Although high surface area can increase soil water holding capacity, its effects are not as significant as CEC (Wang et al 2019). For instance, Piash et al (2016) proved water hyacinth biochar with low BET surface area still had a high water holding capacity of 495 ± 11.39% as well as good nutrient retention ability.…”

Section: Biochar Surface Areamentioning

confidence: 99%

Biochar from vegetable wastes: agro-environmental characterization

Pradhan

Abdelaal

Mroué

et al. 2020

Biochar

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Considering the global issue of vegetable wastes generation and its impact on the environment and resources, this study evaluated the conversion of four largely produced vegetable wastes (cauliflower, cabbage, banana peels and corn cob residues) into biochar. Each waste was tested individually and as a combined blend to assess feedstock influences on biochar properties. In addition, various pyrolysis temperatures ranging from 300 °C to 600 °C and two particle size fractions (less than 75 µm, 75–125 µm) were considered. Biochars were characterized for various properties that can influence the biochars’ effectiveness as a soil amendment. It was found that pyrolysis temperature was the most dominant factor on biochar properties, but that individual feedstocks produced biochars with different characteristics. The biochars had characteristics that varied as follows: pH 7.2–11.6, ECE 0.15–1.00 mS cm−1, CEC 17–cmolc kg−1 and ζ-potential − 0.24 to − 43 mV. Based on optimal values of these parameters from the literature, cauliflower and banana peels were determined to be the best feedstocks, though mixed vegetable waste also produced good characteristics. The optimum temperature for pyrolysis was around 400 °C, but differed slightly (300–500 °C) depending on the distinct feedstock. However, smaller particle size of biochar application was always optimal. Biochar yields were in the range of 20–30% at this temperature range, except for corn cobs which were higher. This study demonstrates that pyrolysis of dried vegetable wastes is a suitable waste valorization approach to produce biochar with good agricultural properties.

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Physico-chemical properties and nutrient content of some slow pyrolysis biochars produced from different feedstocks

Cited by 22 publications

References 14 publications

Co-Composting of Khat-Derived Biochar with Municipal Solid Waste: A Sustainable Practice of Waste Management

Co-Composting of Khat-Derived Biochar with Municipal Solid Waste: A Sustainable Practice of Waste Management

Impact of MgCl<sub>2</sub> Modified Biochar on Phosphorus and Nitrogen Fractions in Coastal Saline Soil

Biochar from vegetable wastes: agro-environmental characterization

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Physico-chemical properties and nutrient content of some slow pyrolysis biochars produced from different feedstocks

Cited by 22 publications

References 14 publications

Co-Composting of Khat-Derived Biochar with Municipal Solid Waste: A Sustainable Practice of Waste Management

Co-Composting of Khat-Derived Biochar with Municipal Solid Waste: A Sustainable Practice of Waste Management

Impact of MgCl&lt;sub&gt;2&lt;/sub&gt; Modified Biochar on Phosphorus and Nitrogen Fractions in Coastal Saline Soil

Biochar from vegetable wastes: agro-environmental characterization

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Impact of MgCl<sub>2</sub> Modified Biochar on Phosphorus and Nitrogen Fractions in Coastal Saline Soil