THE QUALITY CHARACTERISTICS OF PAKSAN FACTORY INDUSTRIAL WASTEWATER

Introduction: Treatment of Wastewater due to product and consumption of material cleaning with special physicochemical characteristics is difficult, and therefore can cause significant environmental problems such as eutrification, toxicity, algae bloom and etc.To stop these consequences, assessing the quality characteristics of this wastewaters is necessary. To investigate about the appropriate method of treatment, Paksan Factory producing 30 percent of Iran detergents was selected. Materials& Methods: This study was a descriptive-cross-sectional one in which 30 wastewater composite samples24 hr (obtained by combining portions of 720 grab samples) were taken during a five month period. The samples were properly preserved with acid and kept under 4 ◦ C during experimentation and transported to laboratory. The chemical characteristics were determined. Data analyzed using descriptive statistics. Results: The results of the samples showed that the wastewater temperature was 40.84±12.31 and the pH was 10.56±2.96. It also showed that the concentrations of the organic loading of wastewater were very high, expressed as COD, ranging from 6254-13040 mg/l, concentration of BOD was 2459-3200mg/l and concentration of MABS ranging from 245-1120mg/l.The results indicated that the BOD 5 /COD ratio was 0.34±0.09 and the mean of phosphorus was 88.13 mg/l. Conclusion: temperature and pH in wastewater of this factory have ringed with very changes and organic load was high. In most of samples BOD 5 /COD ratio was proper for biological treatment but in the samples that were not proper for biological treatment this problem would be solved with combination treatment of industrial wastewater and domestic one This wastewater has high concentration of foaming that prohibit of oxygen infiltration in wastewater and nonbiodgredable material. These results indicated that the wastewater is not easily subjected to conventional system of biological treatment; therefore such wastewater can cause some environmental problems.