الفهرس | Only 14 pages are availabe for public view |
Abstract The experimental study was carried out to assess the environmental impact of wastewater from industrial activities on some soil’s physical, chemical properties and to study risk assessment of using irrigation water mixed with industrial wastewater on soil and plants. El-Roby village’s agricultural soils were chosen for this purpose because they are irrigated by the Bahr Wahba canal, which is adjacent to the Kom Oshim industrial zone. Thirteen water samples were collected from the study sites (one from each), plus one wastewater sample and one water sample from the Nile for comparison. Pre-cleaned high-density polyethylene bottles were used for the sample. Soil samples were collected from farms irrigated by wastewater from the canal that runs through the study area. Two representative soil samples were collected from soil profiles at potential root zone depth for each farm (0 – 30 cm, 30 – 60 cm). The results revealed that the lowest pH value was found in industrial wastewater, this means that the use of this irrigation water should be done with caution. The highest EC dS m-1 value of the industrial wastewater cations and anions distribution was the descending order as following:-Na+<Ca2+<Mg2+<K+ and Cl−<SO4 =<HCO3 −<CO3 = . All soluble ions were found at permissible limit except soluble N was excessive levels, boron content at toxic levels. Some micro-nutrient deficiency problems and not contamination by heavy metals, i.e, Industrial water is not valid for irrigation as well as mixed water not suitable for irrigation. The average ESP in all sites was 20.20. Higher concentration of soil OM% in clay soil was found in appreciably 2.23-1.62% than OM content in sandy loam soils 0.94-0.24%. CaCO3 content varied from 10.20-5.20 and 6.6- 5.00% while those of CEC ranged from 15.02-10.24 and 40.25 - 30.25 cmolc kg-1 for sandy loam and clay soils, respectively. Data also clarified the correlation coefficients which were highly significant between physical, chemical properties, total, available macro, micro and heavy metals content of soil under study. The contamination factors (CF) were low with Mn, Zn and Cr at all investigated sites and contamination degree (Cd) was ultra-high in all sites excepted one site was extremely high. The Enrichment factors (EF) of the heavy metals were more than 1.0 for most of the metals, expect Mn and Cr at all sites under study except one site for Zn from total sites under study. The bio concentration factor (BCF); for each plant has a specific capability to accumulate elements in their tissue. For example summer season all plants were hyperaccumulator for Fe, Mn, Zn, and Cu in all sites except Zn and Cu in carrot shoot. |