ABSTRACT
To find the quantity and quality of wastewaters of the two main industrial units of Khoy city in West Azerbaijan Province, Iran, namely the Slaughterhouse and the Totia Chocolate Factory, ten composite samples were taken in 112 hour intervals between 3.5 and 7.5 A.M. [4 hours working shift] from the Slaughterhouse and between 7.5 A.M. and 2 P.M from the Totia Chocolate Factory [8hours working shift]. The analyses were done according to the latest [1985] edition of the Standard Methods. The results showed that water consumption rates of the Slaughterhouse and the Chocolate Factory were 29m3 and 31. Sm3, respectively, whereas the means of their wastewater flow rate per hour were 5.9m3 and 2.9m3, discharged directly into the Ghator River and its branches. The means of the fat substances, settleable solids, BOD5 and COD of the slaughter livestock in one working shift was 1451 mg/1. Comparing per capita per day BOD production of humans, reported to be 54 gram per day, we find that the BOD production of humans, reported to be 54 gram per day we find that BOD population equivalent of the Slaughterhouse waste was equivalent to BOD of 770 persons