Sulfate removal from water using different adsorbents

In this study, the effect of column properties (column diameter, column fill height), input sulfate concentration and contact time parameters on adsorption for different adsorbents in sulfate removal by adsorption method from synthetically prepared samples was examined and the removal yields for different adsorbents were compared. Between clinoptilolite particle sizes between 0.5 to 1 mm as adsorbents, Divinilbenzen styrene ( DVBS ) anionic resin, sodium (na) - based cationic resin (1-1,4 mm) and (1,4-2 mm) with two different particle size and pure HCl, NaOH and NH3 modified with Activated Carbon was used. Specially prepared vertical cylindrical columns with a height of 55 cm with an internal diameter of 2 cm, 3 cm, 3.5 cm and 4 cm with a height of 7.5, 10 and 15 cm column filler heights were used. a synthetic sulfate solution of 250, 500 and 1000 mg/L was prepared. In addition, synthetic sulfate solutions with a concentration of 750 mg/L were used for activated carbon. The sulfate concentration was determined by HACH DR 2400 spectrophotometer measurements. As a result of the measurements, the maximum sulfate removal efficiency was 2cm column diameter, 500 mg/L concentration and 24% at 15 cm column filler height for clinoptilolite; 3.5 cm column diameter, 1000 mg/L concentration for DVB styrene anionic resin, 99% at 15 cm column filler height ; and 3 cm column diameter for sodium-based cationic resin, 1000 mg/L concentration, 99.9% at 10 cm column filler height; 4 cm column diameter for large grain size activated carbon 1000 mg/L concentration 7.5 cm column filler height 52%, 3 cm column diameter for small grain size activated carbon 10 cm column filler height 1000 mg/L 75.5% for concentration; 3.5 cm for NaOH modified activated carbon column diameter 7.5 cm column filling height and 44.5% at a concentration of 1000 mg/L; In HCl-modified activated carbon, 4 cm column diameter was determined as 7.5cm column filling height and 56% at 1000mg/L concentration, in NH3-modified activated carbon, 4 cm column diameter was determined as 15 cm column filling height was determined as 92% at 250 mg/L concentration. In this study, artificial neural networks (ANN) model has been developed to determine the sulfate removal percentage for sodium-based cationic resin and SODIUM styrene anionic resin. As the input parameters, 70 pieces of data were used by taking column diameter, adsorbent height, adsorption contact time, adsorbent type, initial sulfate concentration. As a result of the ANN studies, the correlation coefficient values (R2) were calculated as 1,000 and 0,999 RMSE values, respectively, 0.0012 and 0.0034.