Study Of Emulsion Wastewater Treatment With Complex Flocculant

Emulsion wastewater discharged from steel rolling and engine processing is the main reason for high organic content of water, does very harm to the survival environment of the aquatic animals and plants, reduces the value of the aquatic resource. So far many researches on low concentration oily water have been carried out, but the high concentration and emulsified badly oily water has not been treated effectively because of the high stability of the emulsion and low efficiency of the flocculants.In this paper, PASS, a kind of complex flocculant, is used to treat emulsion wastewater. The study results show that flocculation is the key to treat emulsion wastewater. Complex flocculant PASS has the abilities of neutralizing electric charge and flocculating. The experimental results show: it is feasible that the emulsion wastewater can be treated into qualified discharging water. The dosage of flocculants and pH value have been optimized by coagulation experiments. In addition the mechanism for emulsion wastewater has been studied by using Perron timed complex colorimetric method and neutralization method. Aiming at characteristics of high concentration and high CODCr emulsion wastewater the technology that emphasized on coagulation-precipitation twice has been proposed in this paper. The treatment technology is simple and easy control.The experiment results show that when turbidity of the wastewater is 11230NTU; CODCr is 21900mg/l; oil is 3646mg/l, after coagulation can be reduced to 12NTU, 348mg/l and 8.6mg/l. The removal efficiencies of the turbidity, CODCr and oil are 99.89%, 98.41% and 99.76%. After coagulation-precipitation twice and filtration CODcr is lower than 150mg/l which meets the national discharging standard.At last a process design has been suggested for emulsion wastewater.