Green immobilization of toxic metals using alkaline enhanced rice husk biochar: Effects of pyrolysis temperature and KOH concentration

2020 ◽  
Vol 720 ◽  
pp. 137584 ◽  
Author(s):  
Liuwei Wang ◽  
Nanthi S. Bolan ◽  
Daniel C.W. Tsang ◽  
Deyi Hou
Keyword(s):  
Rice Husk ◽  
Toxic Metals ◽  
Pyrolysis Temperature ◽  
Rice Husk Biochar

scholarly journals Production of high-density polyethylene biocomposites from rice husk biochar: Effects of varying pyrolysis temperature

2020 ◽  
Vol 738 ◽  
pp. 139910 ◽  
Author(s):  
Qingfa Zhang ◽  
Donghong Zhang ◽  
Wenyu Lu ◽  
Muhammad Usman Khan ◽  
Hang Xu ◽  
...  
Keyword(s):  
Rice Husk ◽  
High Density Polyethylene ◽  
Pyrolysis Temperature ◽  
High Density ◽  
Rice Husk Biochar

scholarly journals Temperature Effects on Properties of Rice Husk Biochar and Calcinated Burkina Phosphate Rock

Agriculture ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 432
Author(s):  
Vincent K. Avornyo ◽  
Andrew Manu ◽  
David A. Laird ◽  
Michael L. Thompson
Keyword(s):  
Formic Acid ◽  
Rice Husk ◽  
Phosphate Rock ◽  
Pyrolysis Temperature ◽  
Sub Saharan Africa ◽  
Amorphous Sio2 ◽  
Extractable P ◽  
P Content ◽  
Sub Saharan ◽  
Rice Husk Biochar

Rice husk biochar (RHB) and phosphate rock (PR) are locally accessible resources that poor farmers in Sub-Saharan Africa (SSA) can utilize to increase rice productivity. However, biochars are variable depending on feedstock, pyrolysis temperature, and duration. Phosphate rocks from SSA are of low solubility. The goal of this study was to determine whether pyrolysis of rice husk (RH), calcination of PR, and the calcination/pyrolysis of a RHB-PR mixture at 300 °C, 500 °C, and 700 °C can increase formic acid (FA)- extractable phosphorous (P). The properties of these RHBs were compared to the properties of RHB produced through a simple farmer-friendly pyrolysis technique termed “Kun-tan”. Properties of calcinated PR were also compared to the raw PR. Quartz formed from amorphous SiO2 during RH pyrolysis and was the dominant mineral phase in the biochars, irrespective of the pyrolysis temperature. Formic acid-extractable P content, pH, and ash content of the biochars increased with increasing pyrolysis temperature. At 700 °C, FA-extractable P content of the RHB was 219% more than the feedstock. Hydroxyapatite and quartz were the dominant minerals in the PR irrespective of calcination temperature, indicating that hydroxyapatite and quartz were stable to at least 700 °C. Rather, calcination decreased the FA-extractable P content of the PR.

scholarly journals Effect of pyrolysis temperature on Si release of alkali-enhanced Si-rich biochar and plant response

Biochar ◽  
2021 ◽  
Author(s):  
Meng Wang ◽  
Negar D. Tafti ◽  
Jim J. Wang ◽  
Xudong Wang
Keyword(s):  
Rice Straw ◽  
Rice Husk ◽  
Pyrolysis Temperature ◽  
Weak Acid ◽  
Rice Grain ◽  
Neutral Salt ◽  
Salt Solutions ◽  
Plant Disease Control ◽  
Si Content ◽  
Lower Temperature

AbstractRecent studies have shown that silicon (Si) dissolution from biochar may be influenced by the pyrolysis temperature. In addition, the enhancement of biochar by treatment with alkali has been proposed to produce a Si source that can be used for environmentally friendly plant disease control. In this study, biochars from rice straw and rice husk pretreated with KOH, CaO and K2CO3 and then pyrolyzed at 350, 450 and 550 °C were prepared to evaluate the effects of pyrolysis temperature on Si release and plant uptake from alkali-enhanced Si-rich biochar. Extractable Si and dissolution Si from the prepared biochars were assessed by different short-term chemical methods and long-term (30-day) release in dilute acid and neutral salt solutions, respectively, along with a rice potting experiment in greenhouse. For both rice straw- and husk-derived alkali-enhanced biochars (RS-10KB and HS-10K2B, respectively), increasing the pyrolysis temperature from 350 to 550 °C generally had the highest extractable Si and increased Si content extracted by 5-day sodium carbonate and ammonium nitrate (5dSCAN) designated for fertilizer Si by 61–142%, whereas non-enhanced biochars had more extractable Si at 350 °C. The alkali-enhanced biochars produced at 550 °C pyrolysis temperature also released 82–172% and 27–79% more Si than that of 350 °C produced biochar in unbuffered weak acid and neutral salt solutions, respectively, over 30 days. In addition, alkali-enhanced biochars, especially that derived from rice husk at 550 °C facilitated 6–21% greater Si uptake by rice and 44–101% higher rice grain yields than lower temperature biochars, non-enhanced biochars, or conventional Si fertilizers (wollastonite and silicate calcium slag). Overall, this study demonstrated that 550 °C is more efficient than lower pyrolysis temperature for preparing alkali-enhanced biochar to improve Si release for plant growth.

scholarly journals An overview on the preparation of rice husk biochar, factors affecting its properties, and its agriculture application

2021 ◽  
Author(s):  
Daljit Singh KARAM ◽  
Prakash NAGABOVANALLI ◽  
Keeren Sundara RAJOO ◽  
Che Fauziah ISHAK ◽  
Arifin ABDU ◽  
...  
Keyword(s):  
Rice Husk ◽  
Factors Affecting ◽  
Rice Husk Biochar

Influencing factors on sorption of TNT and RDX using rice husk biochar

2015 ◽  
Vol 32 ◽  
pp. 178-186 ◽  
Author(s):  
Lakshmi Prasanna Lingamdinne ◽  
Hoon Roh ◽  
Yu-Lim Choi ◽  
Janardhan Reddy Koduru ◽  
Jae-Kyu Yang ◽  
...  
Keyword(s):  
Influencing Factors ◽  
Rice Husk ◽  
Rice Husk Biochar

scholarly journals Can combined compost and biochar application improve the quality of a highly weathered coastal savanna soil?

2020 ◽  
Author(s):  
Kwame Agyei Frimpong ◽  
Emmanuel Abban-Baidoo ◽  
Bernd Marschner
Keyword(s):  
Soil Quality ◽  
Rice Husk ◽  
Soil Ph ◽  
Poultry Manure ◽  
Basal Respiration ◽  
Sub Saharan Africa ◽  
Corn Cob ◽  
Compost Application ◽  
Rice Husk Biochar ◽  
Compost Treatment

AbstractSoil fertility decline represents a major constraint to crop productivity in sub-Saharan Africa. Many studies have shown that addition of biochar or compost can effectively improve soil quality. Biochar produced from crop residues are often N-poor but rich in stable C while poultry manure composts, which is often rich in nutrients including N decomposes rapidly under high rainfall and temperature conditions. Combined biochar and compost application can compensate for the shortcomings of each other such that their interactive effect is likely to improve soil quality. A 30-days incubation experiment was carried out on a Haplic acrisol amended with corn cob biochar, rice husk biochar, coconut husk biochar, poultry manure compost and composted rice husk or corn cob biochar to examine the effect of compost and biochar, applied singly, in combination or as co-compost on basal soil respiration, and soil quality indicators such as soil pH; soil microbial carbon; cation exchange capacity; total organic carbon, total nitrogen and available nitrogen concentration. The results showed that addition of the different amendments increased soil pH compared with the untreated control with the combined corn cob and rice biochar and compost treatments recording the highest pH values. Basal respiration following sole compost, composted biochar and combined biochar and compost application were significantly greater than the sole biochar and the control treatments. TOC increased by 37% in the sole compost treatment to 117.3% in the combined corn cob biochar and compost treatment, respectively. MBC increased by 132.2% in the combined rice husk biochar and compost treatment and by 247% in the sole compost treatment compared to the control. The study has demonstrated the potential of compost, biochar and especially composted biochar to enhance soil quality, C stabilization and reduce soil C loss through basal respiration.

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