A Study on the Effects of Food Industry Sewage on the Agricultural Water in Dezful

Food industries are one of the most important industries in our country that have significant ratio in the production of crop, the usage of water and the production of sewage. Food industries located in Dezful consist of: Golestan Agric-industrial Company (Saei oil), Dez Dasht Company (Takin meaty productions), Khuzestan leaven Company and poultry Company that their sewage vacates into agricultural drain. This research is aimed on the effect of company sewage in the quality of drain waste for agricultural usages under the support and protection of General agency of Khuzestan Environmental Protection. Considering the facilities and restriction, it's considered sampling four stations around each factory, first station (upward factory as first Shahed), second station (exit sewage factory), third station (200 meter from drainage), forth station (500 meter from drainage). Samples are done in both summer and winter. Physical-chemical parameters of water and sewage in each factory such as PH, turbidity, ISS, EC, BOD, COD,,, oil and fat, phosphate, Koli Form sums, Nickel, Kadiom and Iron are analyzed. Statistical analysis on final results from sampling of observational stations showed that there wasnt a meaningful difference in % 95 confidence levels between measured parameter in both summer and winter in all factories. Also, there wasnt a meaningful difference in both summer and winter with the same confidence level between stations. The discussion on changing the procedure showed the more increase of factories from Shahed station and their decrease in 4 stations (500meter); however, they had maximum distance from standard of Iran Environmental Protection Agency.