石灰法工艺对含油废水预处理的研究

Study on Pretreatment of Oily Wastewater by Lime Process

摘要: 以大连某油脂加工厂产生的实际油脂废水为研究对象，采用石灰法对含油废水进行预处理，当系统内只加入石灰时，除磷效率可达98%左右，石灰投加量为50 g/L，出水pH值约为8.1，电导率约为39.6 ms/cm，同时也可以去除25%的COD。当调节原水pH值为3.0，在石灰投加量为23 g/L，恒速搅拌50 min，静沉20 min的条件下，磷的去除率可保持在95%以上，COD的去除率为21.2%~27.5%，电导率为50 ms/cm左右，出水稳定在9.0以下，不影响后续生化处理。

Abstract: Taking the actual oil and fat wastewater generated by a grease processing plant in Dalian as the research object, the lime oil method was used to pretreat the oily wastewater. When only lime was added to the system, the phosphorus removal efficiency could reach 98%, and the lime dosage was 50 g/L. The effluent has a pH of about 8.1, a conductivity of about 39.6 ms/cm, and a 25% COD re-moval. When the pH value of raw water is adjusted to 3.0, the removal rate of phosphorus can be kept above 95% and the removal rate of COD is 21.2%~27.5% under the condition of lime dosage of 23 g/L, constant stirring for 50 min and static sinking for 20 min. The conductance is about 50 ms/cm, and the effluent is stable below 9.0, which do not affect the subsequent biochemical treatment.