Assessment of the impact of wastewater use on soil properties

The concern of this study is to determine the quality of soil when irrigated using treated wastewater tww in comparison with soil irrigated with groundwater. thus,about thirty six soil's samples from area called bani-alharth in sana'a yemen were examined to assess the soil behaviour when using wastewater. results showed decreased in ph unit from 8.16 in soil irrigated with ground water to 7.70 in soil irrigated with wastewater. evaluation of individual parameters which have risks for human health and environment was performed. physicochemical properties of soil irrigated with wastewater were higher,with averages of 921,591,399,519,27.33 and 40.33 mg/kg,when compared to those obtained with soil irrigated using groundwater 657,422,474,115,6.22,and 15.67 mg/l; respectively; for ec,tds,na,k,p,and n. also microbiological analyzes showed higher population counts of microflora in all samples from soil irrigated using wastewater with averages of 4.6×107,1.3×105,1.2×103,2.9x105,2.5×104 and 6.4×103 respectively for total aerobic plate counts,total coliforms,fecal coliforms,staphylococcus aureus,yeast and mould counts. observed values of soil irrigated with groundwater were 3.5×106,5.4×104,7.8×102,5.1×104,1.0×104 and 3.6×103 respectively. salmonella,shigella and clostridium bacteria were also detected in all tested samples. on the other side,this research showed that the soil irrigated with wastewater has the best concentration of organic matter,which was equal to (2.00) (%) compared to (0.74) (%) obtained for soil irrigated with groundwater. therefore,the research exhibited that treated wastewater can effectively be used as fertility source for soil; alongside that wastewater irrigation had a high influence on microbial soil pollution.