Investigation on Quality and Quantity of Food industrial Wastewaters and Its Effect on the Wastewater System Operation (case study: Minoo industrial company- Khorramdarreh

This research was done on wastewater in Minoo industrial Co. to existing concerns about the quality and quantity of wastewater industries and its effects on human andenvironment as well as existence of different contaminant in this kind of wastewater system and lack of information about the parameters status and its influence on wastewater system operation. For determination of wastewater quality, we took samples from 18 stations of different wastewater treatment plant and production points during 10 times. The pH,Temperature, Oil & Grease BOD5, COD, TSS about all stations have been determined. The measurement of effluent in entrance point of wastewater treatment plant was done using an installed flow meter. Finally, the relationship between results at different months and stations was done using ANOVA and correlation variance test in SPSS software. According to the results influent discharge varied in range of 100-150 m3/day, pH, TSS, BOD, COD, Oil & Grease at different stations varied in range of 3.95-10.96, 0-1637.7, 1.9 59674, 6- 99600, 0 -1008 mg/l respectively. The removal efficiency of COD, BOD, TSS, Oil & Grease in wastewater treatment plant varied in ranges of 94-99.7%, 99-99.8%,89-98.5%,92.7 100%, respectively. This study shows that changing of seasons, time, type and amount of waste water production effect on pollution and calculation of the BOD5/COD ratio at influent discharge depicted that by using this type of biological wastewater treatment system is selected properly and can change 10-15% used water in factory to the wastewater.