Effect of Metallic Coagulant Agents on Oily Wastewater Treatment Performance using Mullite Ceramic MF Membranes

ISSN： 0149-6395

Source： Separation Science and Technology, Vol.47, Iss.16, 2012-01, pp. : 2290-2298

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Abstract

In this paper, the effects of in-line coagulation on permeation flux (PF), fouling resistance (FR), and total organic compound (TOC) rejection (R) of synthesized mullite ceramic membranes during treatment of oily wastewater in coagulation – MF hybrid process were investigated. Four coagulant ((ferrous chloride (FeCl₂.4H₂O), ferrous sulphate (FeSO₄.7H₂O), aluminum chloride (AlCl₃.6H₂O) and aluminum sulphate (Al₂(SO₄)₃.18H₂O)) plus equal concentration of lime in the form of calcium hydroxide (Ca(OH)₂) were evaluated in the coagulation – MF hybrid process at different concentrations (0 ppm, 25 ppm, 50 ppm, and 100 ppm). The results showed that coagulation can affect the membrane filtration by changing characteristics of the oil droplets. Coagulant agents improve the membrane performance at low dosage (25 ppm) for aluminum chloride and mean dosage (50 ppm) for ferrous chloride, ferrous sulphate, and aluminum sulphate. At the best conditions (50 ppm ferrous sulphate), PF increased from 2.22 × 10⁻⁵ to 2.76 × 10⁻⁵ (m³/m² s), FR decreased from 4.2 × 10¹² to 5.55 × 10¹¹ (m⁻¹), and R increased from 93.8% to 97.1%.