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Study on Oil-Containing Wastewater Treatment by Using Modified Fly Ash

Fly ash was modified by using chemical methods. The conditions for modification of fly ash were optimized, then the modified fly ash was used to treat oil-wastewater and the treatment conditions were also optimized. The result demonstrated best modified conditions of fly clay were the room temperature,0.3 mol/L hydrochloric acid solution, modifying time 15 min and proportion of ash to acid 1∶2. The removed rate of oil was as high as 98.44% and oil concentration was 2.3 mg /L which met the first grade national discharges standard for oil-containing wastewater, when the adsorption temperature was at room temperature, p H value was below 3, the dosage of modified fly ash was 100 g/L and the contacting time was 2 h.