Removal of turbidity from synthetic cutting oil wastewater by a strong oxidizing agent

On a purely comparative basis, the physico-chemical and turbidity treatment of cutting oil emulsion was applied to two different mineral oils (A and B). In this study, the results show that Ce(IV) had a strong ability to remove turbidity of cutting oil wastewater, at the same time, Ce(IV) could form a larger surface area of sediment, which could adsorb and flocculate oily species and suspended solids and so on. Therefore, Ce(IV) is a double-effect of water treatment agent. At present, rare earth application in waste water treatment has become more and more widely, according to the fact that the Ce (IV) has the strong oxidation ability under acid conditions; we have studied the application of Ce (IV) in cutting oil waste water treatment originally. Batch experiments were performed to investigate the effect of operational parameters, such as initial pH (pH optimum<1), type of acid, dose of cerium sulfate (1 g/L), initial cutting oil concentration (100-10000) based on constant contact time (0.5hr), the removal turbidity efficiency reached over 99%. The Ce (IV) was one kind of latent good water treatment chemical reagent. Oxidation process hold great promise to provide alternative for better treatment and protection of environment. It was found that catalytic activity of this catalyst was significantly enhanced under acidic conditions to provide a treating method of spent cutting oil-containing waste water, without sludge and is industrially advantageous. The final turbidity of cutting oil A wastewater reduced to 1.5 NTU which meet discharge standard.

کلیدواژه ها:

Turbidity ، Cutting oil ، Rare earths ، Cerium sulfate ، Oxidizing agent