كليدواژه فارسي :
كنجاله كنجد , پساب زهكش , چاه افضل , جذب , شوري زدائي , زغال زيستي
كليدواژه لاتين :
Sesame residue , drainage effluent , desalination , wells , bio-charcoal , adsorption
چكيده انگليسي :
The increase in population along with the expansion of agricultural and industrial activities has increased the demand for water, and as a result, water resources of the desired quality reach their peak of exploitation and excessive pressure is placed on the country's water resources. One of the most important solutions in this field is the use of unconventional water such as brackish and brackish water. Irrigation water salinity is one of the important factors in soil salinization, reducing soil permeability and reducing crops, and finding new low-cost methods to reduce irrigation water salinity is inevitable. Due to the relatively high cost of various desalination methods, the use of inexpensive sorbents in reducing water salinity has been considered in recent years. In the meantime, the use of crop residues and agricultural wastes has been welcomed due to its cheapness and easy access. Bio-carbon is a carbon-rich, inexpensive, and environmentally friendly porous material produced by biomass pyrolysis. In this study, sesame meal adsorbents and bio charcoal prepared from it at temperatures of 500, 400 and 600 ° C were used to desalinate the drainage effluent of Chah Afzal region. The experiments were performed using four adsorbent treatments at four salinity levels of 5, 10, 20 and 35 dS / m in three replications as a factorial experiment in a completely randomized design. Absorption experiments were performed in two environments: continuous (columnar) and discontinuous, and the effect of effective parameters on adsorption including contact time, initial concentration of salinity ions in water, isotherm and adsorption kinetics, as well as the effect of adsorption on irrigation water quality parameters including electrical conductivity, p Hash and total soluble solutes were examined. The results showed that at four salinity levels of 5, 10, 20 and 35 dS / m, the highest salt uptake by the studied treatments was 24/4, 57, 139/9 and 308/6 mg / g, respectively. All four salinity levels correspond to the bio-adsorbent prepared at 600 ° C. Also, the lowest ion uptake in these four salinity levels was 5/6, 14/3, 50/5 and 96/7 mg / g, respectively, which was related to the treatment of raw sesame meal. The greatest decrease in electrical conductivity for the studied adsorbents occurred at a salinity of 35 dS / m, which was 600 times 10/91 dS / m for biochar treatment. In all four salinity levels, raw sesame meal increased the levels of calcium, magnesium and bicarbonate ions. At all salinity levels, the lowest amount of adsorbed ions is related to potassium and the highest amount of adsorbed ions is chlorine anion. Also, adsorption kinetics studies showed that the quasi-second order kinetics model was most consistent with the experimental data. In a way that for the studied treatments, the correlation coefficient related to this model is 0/97. Also, based on the results of adsorption isotherm studies, Langmuir model with a correlation coefficient of more than 0/99 for the selected treatment was determined as the best adsorption isotherm model. The specific surface area of bio-charcoal was obtained at different temperatures of 400, 500 and 600 ° C, respectively, 198/43, 238/17 and 317/21 m2 / g, which shows that with increasing carbonation temperature, the specific surface area of coal Biological and consequently the absorption capacity has increased.
