煤制烯烃新型煤化工和传统煤化工一样存在废水处理水质不达标和系统稳定性差的现象，但也由于其多于传统煤化工产业的后续工段，比如烯烃分离、碳四回炼等工段，其废水比传统煤化工产量更大、污染物成分更加复杂，且处理难度增强。通过水质检测，烯烃分离系统产生的废碱液含油量高达600mg/L，且COD值达30000mg/L左右，BOD5/CODcr=0.15，可生化性比较差，对污水处理装置的稳定运行造成相当大的冲击。因此，经济环保地处理煤化工烯烃分离系统中废碱液具有非常重要的意义。 本文通过实验对煤制烯烃工艺烯烃分离系统中产生的废碱液进行预处理除油及催化氧化降COD探索研究，将其含油量及COD值都降到生化废水处理系统可接收的浓度范围内。论文重点考察了该废碱液除油预处理和催化氧化降COD的处理方法，优化了实验条件，取得了良好的实验效果，达到了实验目的，内容主要包括以下三个方面： （1）在废碱液除油实验研究中，采用吸附过滤、混凝、气浮进行除油处理。对影响除油效果的各因素进行单因素实验。结果表明，在核桃壳滤料、实验装置40cm滤料填充厚度、过滤时间45min、PAC及PAM作为复合混凝剂气浮30min时可达到理想的除油效果。 （2）在催化氧化降COD实验研究中，取核桃壳滤料过滤后滤液为原料，完成了各因素对催化氧化效果影响的单因素实验和正交实验，验证了实验方法的合理性。由单因素实验结果明确了各因素对实验结果的影响趋势，并在此基础上进行正交试验，确定了最佳实验条件，即H2O2浓度为40mL/L（wt=30%），FeSO4浓度为3g/L，反应温度为85℃，反应时间为90min。在最佳催化氧化实验条件下，COD去除率可达88.7%，油去除率可达94.2%，最低降至16.7mg/L，可以达到后续处理要求。 （3）基于实验装置及实验结果对废碱液处理工艺进行设计，完成工艺流程图及主要设备选型。在实验及其工艺设计基础上，该工艺的除油工艺已部分试投用于某煤制烯烃化工厂，且运行效果良好。

The new coal chemical of coal to olefins has the same phenomenon that the water quality of the waste water treatment is not up to standard and the system stability is inferior as the traditional coal chemical industry.But also because of its more follow-up section than the traditional coal chemical industry, such as olefin separation, carbon four refining and other sections, Compared with the traditional chemical production, its waste water has greater production, more complex components and the difficulty degree of treatment increased.It was found that its oil content is up to about 600mg / L , the COD content is about 30000mg / L and BOD5 / CODcr = 0.15 through the water quality detection of waste lye in the olefin separation system,these results show that the waste lye has poor biodegradability,and it has caused a serious impact for the stable operation of sewage biochemical treatment device.Therefore,the economic and environmental protection methods to deal with new coal chemical waste lye which has high concentrations and difficult to be processed by biochemical ways has a very important significance. In this paper, through the experiment to research pretreatment for oil removal and catalytic oxidation for COD reduction on the waste lye which produced by olefin separation system of coal to olefin process,and reduce the the oil content and COD value to the concentration which biochemical waste water treatment system could accept. This article focus on the treatment methods of pretreatment for oil removal and catalytic oxidation for COD reduction,optimized the experimental results and the purpose of these experiments.The article content mainly includes the following three aspects: (1) In the experiments researching of waste lye oil removal, used the way of adsorption filtration, coagulation, gas floating to deoiling treatment and the single factor experiment was carried out on the factors affecting the oil removal. The results showed that the oil removal efficiency was well when the thickness of the walnut shell filter was 40cm, the filtration time was 45min and the gas floating time was 30min which PAC and PAM acted as the compound coagulant . (2) In the experimental study of catalytic oxidation for COD reduction, the filtrate after walnut shell filter was used as raw material, completed the single factor experiment and orthogonal experiment of various factors which effect the catalytic oxidation,verified the rationality of the experimental method.The effects of various factors on the experimental results were confirmed by the results of single factor experiments,and on this basis, the orthogonal experiment was carried out to confirm the optimal experimental conditions:H2O2 concentration was 40mL/L (wt = 30%), FeSO4 concentration was 3g / L, reaction temperature of 85℃, reaction time was 90 min. Under the optimum catalytic oxidation conditions, the removal rate of COD was up to 88.7%, the oil removal rate was 94.2% and the lowest oil content was 16.7mg / L.It could meet the requirements of subsequent processing. (3) Based on the experimental device and the experimental results,completed the waste lye treatment process design and the main equipment selection,drew the process flow diagram. On the basis of the experiment and its process design, the degreasing process partly has been tried to be used in a coal chemical plant, and it runs well.