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Articles by Ahmed A. Al-Othman
Total Records ( 2 ) for Ahmed A. Al-Othman
  Ahmed A. Al-Othman
  The study was carried out to determine the effect of treated domestic wastewater (TDW) on physical, chemical and microbial properties of three soils. There was no significant change in the sand, silt and clay fractions after 458 days of TDW irrigation. The parameters included soil pH, which remained within moderately alkaline region after 458 days of TDW irrigation. The SAR of A and B soils changed from 3.27-2.95 and 3.67-2.15, respectively after 200 days of irrigation. But, the decrease in SAR was less in the same soil when irrigated with TDW continuously for 458 days compared to 200 days due to salt leaching to lower soil depths. The concentration of cations (Na+, K+, Ca2+, Mg2+) showed significant (p<0.001, p<0.032) increase after 200 days followed by a significant (p<0.001, p<0.008) decrease after 458 days of TDW irrigation. The concentrations of Na+ in A and B soils decreased with the soil depth except soil C which showed the highest concentration of K as 13.9 meq L-1 than the control sample as 3.2 meq L-1 after 200 days of irrigation and at 150 cm soil depth. The K+ concentration increased from 0.2 to 0.5 meq L-1 and 0.2-0.8 meq L-1 in A and B soils, respectively. However, at 458 days of irrigation, the K+ concentration dropped below, 0.2 meq L-1 in both samples. The electrical conductivity (EC), sodium absorption ratios (SAR), cations (Na+, K+, Ca2+, Mg2+) and anions (CO32¯, HCO3¯, Cl¯, SO42¯) showed similar patterns. But the values of these cations/anions increased after 200 days of irrigation which again dropped below the initial values of soils. The average number of bacteria in soil A, B and C after 200 days and 458 days of TDW irrigation were 99 and 393 cells, 149 and 333 cells and 56 and 559 cells, respectively. In addition to the above, the microbial analysis indicated that E. coli was absent in all the soils irrigated with TDW. The research findings suggest that although the TDW irrigation did not mainly affect the physical and chemical properties of soil under investigation, but is likely to contaminate the groundwater on long term basis in Riyadh region.
  Ahmed A. Al-Othman
  The study was carried out to determine the correlation between soil texture index of different soils and groundwater water chemical parameters during irrigation with Treated Domestic Wastewater (TDW). Mean calcium (Ca) contents of groundwater ranged from 308-432 mg L-1. The relationship between soil texture index and calcium contents of groundwater was negative (r = -0.908). Mean sulphate contents ranged from 755-833 mg L-1 and the relationship was negative with STI (soil texture index ) as indicated from the correlation coefficient (r) value of -0.939. The HCO3 contents increased significantly with an increase in the soil texture index with R2 value of 0.9516. This suggested that soil type clearly affects the HCO3 contents of groundwater. The total alkalinity ranged from 20-30 mg L-1 and is significantly affected by Soil Texture Index (STI) with a coefficient of determination vale of 0.9516. Overall, correlation between STI and some ions was positive (HCO3, total alkalinity and pH) while it was negative for Ca and SO4 ions. The STI significantly affected the concentration of some chemical parameters of groundwater and showed high potential for more investigations on different types of soils and irrigation waters to assess groundwater contamination resulting from treated domestic wastewater irrigation.
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