COMPARING THE SETTLING CHARACTERSTICS OF INDUSTRIAL, DOMESTIC, AND COMBINED WASTEWATER

Diaa S. El Monayeri, Nabil N. Atta, Sameh M. El Mokadem, Emad H. EL Gohary

Abstract


The addition of industrial WW to domestic WW should make a variation in its characteristics in termsof alkalinity, density and viscosity, TSS concentration and distribution, organic acid content, andheavy metals. Thisvariation could affect the performance of primary settling tanks that receivedcombined industrial and domestic WW. In the present study two different types of industrial WWwere mixed with domestic WW in order to study the settling behaviors of combined WW by the aidof batch settling tests. Results showed that, at a RT range of (1.5-2.5 hr), and a SLR range of (30–50m/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 Acaused a decrease in TSS removal efficiency by 10% and 17% when mixed with domestic WW atmixing ratio 25% and 50% (industrial) respectively, while the industrial WW type B, showed nosignificant effect in TSS removal ratio when mixed with domestic WW. The flocculent settlingvelocities of the three types of wastewater could be calculated and compared.

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