Synthesis And Performance Study Multifunctional Cationic Flocculants In Treatment Of Oil Field Wastewater

Oil field wastewater is a kind of typical wastewater contained oil, so it will badly pollute environment if it is let without being treated. It is a nodus and hotspot at all times to study the treatment method of oil field wastewater, because the oil in oil field wastewater exists as suspend, emulsification and dissolution and the treatment process is very difficult. In recent years there are many reports and studies on the medicaments used for treatment of oil field wastewater, but there are a few medicaments that can be practically used to treat oil field wastewater; and the effect of them is not perfect enough. There are few reports and research in domestic about the flocculants have the functions of clarification, bactericide, scale inhibitors and delaying-corruption. On the condition, the multifunctional cationic flocculant(PDTC) used for the treatment of oilfield wastewater was synthesized firstly and the fiocculation performance was studied by treating oil field wastewater in this paper.It is shown that on the condition of amine:CS2:NaOH (50% weight percent ) =12.00:28.88:16.00, the temperature being 10-15℃,20-28℃, the whole time being 120minute, the stirring rate being 100r/min, the reaction is optimum in a strong alkali solution. Added co-stuffs such as metal salt, aether and ethanol into the flocculant DTC and the flocculant PDTC was synthesized after stirring continued for about 30 minuets. The performance of this reagent PDTC is stable, and the using range of temperature and pH are wide relatively. The rates of removal oil, SS, CODcr and chroma in oil field wastewater are 89.2%, 91.3%, 72.3% and 92.8% separately when the dosage of thisreagent is 25mg/L. This flocculant PDTC has many good characteristics such as little dosage and perfect treatment effect. This flocculant PDTC has multifunction of bactericidal action, delaying corruption action and inhibiting scale action and so on.The flocculant PDTC was used to treat the oil field wastewater and other industrial wastewater with satisfactory results. Therefore, this technique has extensive application value.