%0 Journal Article %T The effect of Pyrolysis Temperature and Type of Organic Residues on Physicochemical Properties of Produced Biochar %J Iranian Journal of Soil and Water Research %I University of Tehran %Z 2008-479X %A MalehMir Chegini, Mohamad %A Golchin, Ahmad %A Khadem Moghadam Igdelou, Nader %A Moraveij, Kamran %D 2020 %\ 05/21/2020 %V 51 %N 3 %P 575-593 %! The effect of Pyrolysis Temperature and Type of Organic Residues on Physicochemical Properties of Produced Biochar %K Almond hull %K enrichment ratio %K functional groups %K walnut hull %K wheat straw %R 10.22059/ijswr.2019.289906.668332 %X Biochar has attracted the attention of many researchers because of its ability to improve soil fertility, immobilization of pollutants, as well as a suitable method of carbon sequestration and as a carbon reservoir. In order to investigate the effect of pyrolysis temperature and type of organic residues on physicochemical properties of biochars, a completely randomized designe as a factorial experiment was designed with two factors of organic residues type (wheat straw and walnut and almond bark) and pyrolysis temperature (300 and 500°C) in three replicates. The results showed that EC, pH, ash, and CEC of biochar increased at pyrolysis temperature of 300°C. By increasing the pyrolysis temperature to 500°C, the amount of organic carbon (OC), CEC, and surface functional groups of biochar decreased compared to biochar produced at 300 °C whereas pH, ash, and EC increased. The highest EC, pH, water soluble materials, ash, and the lowest bulk density were recorded in wheat straw biochar produced at 500°C. The highest value of equivalent calcium carbonate was obtained in almond peel biochar produced at 500°C. Biochar production yield decreased and the loss of volatile compound such as CO2 increased by increasing the pyrolysis temperature from 300°C to 500°C. In addition, the characteristics of biochar were dependent on type of feedstock and pyrolysis conditions (temperature and time residence). %U https://ijswr.ut.ac.ir/article_74108_8a44ed6fcc26b81eabe3dcd68fe2cfa2.pdf