Jeotermal sudan bor gideriminde zeytin budama atıklarının biosorbent olarak kullanım potansiyelinin araştırılması
Project no. 22934 · Status: Kapanmış (Yayın bekleniyor) · 2021
Summary
<p>Today, water scarcity significantly affects people's quality of life and industrial production conditions. Especially in countries with a high population density, the problem of finding water is more common. The use of clean and safe water is very important for the ecosystem cycle and human health. When water is polluted with toxic substances, it harms the environment and living things. For this reason, the importance given to the purification of polluted water in the world and in our country has gradually increased. Boron, on the other hand, is beneficial for living things, and excessive use creates a toxic effect. Boron concentration in irrigation water is of great importance for the development of plants. Therefore, there is a need for purification of debt-rich waters. Advanced technologies are used to remove pipes from wastewater such as adsorption, membrane processes and electrocoagulation. The adsorption process is one of the most applied methods because it is efficient, easy and economical. In this thesis, biosorbent was prepared from olive pruning wastes by slow pyrolysis method to remove boron from geothermal water by adsorption method and these biosorbents were tested for boron removal from geothermal water in batch and continuous systems. In the study, olive pruning wastes selected among agricultural wastes with high potential to be converted into biochar in our country were used. Olive pruning wastes were subjected to slow pyrolysis for 30 minutes. Pyrolysis conditions were investigated in terms of pyrolysis temperature, temperature rise rate and gas flow rate, and optimum pyrolysis conditions were found to be 400 °C, 10 °C/min and 2.5 m/s, respectively. After the pyrolysis step, different modification conditions such as KOH and mannitol, different concentrations and biochar amount/chemical agent ratios were tried to determine the optimum modification conditions. The optimum condition was found to be 0.5 mol/L mannitol. Characterization was performed using FTIR, SEM, XRD, TGA and BET analyses. Balance, kinetic and continuous tests were conducted under optimum pyrolysis and modification conditions to investigate the potential use of olive pruning waste. Boron removal efficiency was investigated in terms of biosorbent amount, pH, temperature and concentration. Data obtained from equilibrium studies were evaluated using isotherm models such as Langmuir, Freundlich, and Redlich-Peterson. Data obtained from kinetic studies were evaluated with First-order, Second-order, Intra-particle and Elovich models. Another point in the study is to remove the boron from the boron adsorbed biosorbent surface and convert it into a reusable structure. For this purpose, after the adsorption and washing steps, NaOH, mannitol, nitric acid, ethanol and methanol solutions at concentrations of 0.1 mol/L and 1 mol/L at 25 °C were contacted in a shaker for 24 hours. As a result of this study, it was found that the most promising result was 1 mol/L NaOH solution with 90.52 % yield. Different flow rates (SV: 3.2, 2.85, 1.2 h-1) and bed height (3.5-7-10.5 cm) were applied for the column study. The resulting release curves were compared with the model data obtained by applying mathematical models such as Thomas and Yoon-Nelson. Boron analysis was performed spectrophotometrically using the Azomethine-H method at λmax = 415 nm.</p>