The study assessed the efficiency of the coagulation process of wastewater with petroleum hydrocarbons content, by using mixed coagulants derivatives of polyaluminum chloride, (characterized by the molar ratio OH : Al = 2.4), mixed with various amounts of chitosan. Systematic study was conducted to define the mixed coagulant, respectively chitosan:polyaluminum chloride product, by relating its two components, within the context of optimal dosage used in the coagulation process, determined

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... mentally by the Jar Test method. The coagulation efficiency was examined by conventional parameters: pH, turbidity, COD, TOC, TPH (Total Petroleum Hydrocarbons) and the unconventional parameter -absorbance at wavelength 254 nm, A 254. Coagulation performance determined with the mixed chitosan -polyaluminum chloride coagulant was reported to the results obtained by coagulating with polyaluminum chloride in the absence of chitosan. The results suggest that the use of mixed chitosan -polyaluminum chloride coagulation agent, prepared at a ratio of chitosan : Al = 0.6, can significantly reduce the optimum dose of Al, more than 50%, and obtain treated samples with the same characteristics as the samples treated with optimal doses of polyaluminum chloride