Summary
This study was conducted to microbiological and physiochemical study of wastewater at Turaq village, that is located in southwest of Erbil city, it is one of the some villages along Erbil wastewater channel irrigated their lands by untreated wastewater for growing and production various vegetables, in order to provide Erbil markets by fresh vegetables. Therefore, this investigation was conducted to evaluate the possibilities of harmful effects of using wastewater for irrigation on environment and human health by determination and detection of microorganisms in different samples (wastewater, sludge, and plant) collected in Turaq village during three seasons ( winter, spring, and summer) 2015-2016.
Results of physiochemical parameters of wastewater show that: water and air temperature values were ranging between (13-21ºC) and (11 -28 ºC). The pH and EC values were ranged between (7.4- 7.9) and (655.54-1149 µS.cm-1) respectively. The turbidity was ranged between (45-390 NTU). Dissolved Oxygen concentrations were under detectable limit during the studied periods. And BOD5 was ranged between (56.3-65 mg.l-1). Nitrate, nitrite, and reactive Phosphate were ranged between (21.96–27.67mg.l-1), (96.8-8.16mg.l-1), and (1.65–3.1 mg.l-1) respectively. For biological analyses, the mean values of heterotrophic bacterial counts for (water, sludge and plant) samples were found to be (198×103, 309×103, and 106×103 CFU.ml-1 respectively). Also the mean values of heterotrophic bacterial counts for all three seasons (winter, spring, and summer) were (330×103, 167×103, and 116×103 CFU.ml-1 respectively). The mean value of total coliform bacteria in Erbil wastewater, sludge and plant samples were (260×103, 168×103, and 375×103 CFU. 100ml-1 respectively). The mean values of total coliform bacteria for the studied seasons (winter, spring, and summer) were (376×103, 124×103, and 303×103 CFU.100ml-1 respectively). The mean values for fecal coliform bacteria in wastewater, sludge, and plant were (183×103, 38×103, and 60×103 CFU.100ml-1) respectively. While, the mean values of fecal coliform bacteria in the studied seasons (winter, spring, and summer) were recorded (0, 0, and 116×103 CFU.100ml-1) respectively. The results for total streptococci bacteria of wastewater, sludge, and plant samples reached (14, 65, and 25 CFU.100ml-1) respectively. Meanwhile, (61, 21, and 23 CFU.100ml-1) were recorded for studied seasons (winter, spring, and summer) respectively. The mean values of fecal streptococci bacteria in (wastewater, sludge, and plant) samples were (6957, 0, and 8944 CFU.100ml-1) respectively. On the other hand, the mean values of fecal streptococci bacteria in the studied seasons were (444, 957, and 14500 CFU.100ml-1) respectively. The results for Salmonella sp. bacteria of wastewater, sludge, and plant samples reached to (22166, 7500, and 0 CFU.100ml-1) respectively as mean value. Salmonella sp. only detected in spring season with mean value 29666 CFU.100ml-1. During this study no Vibrio cholera was observed neither in environmental factors (wastewater, sludge, and plant) nor in studied seasons. Mean values of fungi in wastewater, sludge, and plant samples were (58×103, 117×103, and 180×103 CFU.ml-1) respectively. While in (winter, spring, and summer) seasons were (118×103, 307×103, and 206×103 CFU.ml-1) respectively. Cryptosporidium sp. was the most detected parasite in analyzed samples during the studied period.
posted:14/5/2017