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The addition of industrial WW to domestic WW should make a variation in its characteristics in terms of alkalinity, density and viscosity, TSS concentration and distribution, organic acid content, and heavy metals. This variation could affect the performance of primary settling tanks that received combined industrial and domestic WW. In the present study two different types of industrial WW were mixed with domestic WW in order to study the settling behaviors of combined WW by the aid of batch settling tests. Results showed that, at a RT range of (1.5 -2.5 hr), and a SLR range of (30 – 50 m/d), the removal efficiency of TSS ranged between 56 and 72% for Domestic WW, from 44 to 56% for Industrial WW type A, and from 52 to 65% for Industrial WW type B. Industrial WW type A caused a decrease in TSS removal efficiency by 10% and 17% when mixed with domestic WW at mixing ratio 25% and 50% (industrial) respectively, while the industrial WW type B, showed no significant effect in TSS removal ratio when mixed with domestic WW. The flocculent settling velocities of the three types of wastewater could be calculated and compared.

COMPARING THE SETTLING CHARACTERSTICS OF INDUSTRIA DOMESTIC, AND COMBINED WASTEWATER