炼油厂含油废水处理工艺设计

毕业设计（论文）任务书

本科生毕业设计（论文）须知：

认真学习理解《沈阳化工大学本科生毕业设计（论文）管理规范》。

努力学习，刻苦钻研，勇于实践创新，保质保量的完成任务书规定的内容。

3.尊敬指导教师，虚心向指导教师请教。

4.独立完成毕业设计(论文)任务，不得抄袭和弄虚作假。

5.要严格遵守纪律，服从领导，爱护仪器设备，遵守操作规程和各项规章制度。

6.负责打扫实验室、设计室卫生，确保学习场所整洁、安静。

7.按照任务书规定的工作进程认真填写毕业设计（论文）工作手册。

8.毕业设计（论文）完成后，将任务书同毕业设计（论文）一同交给指导教师。

摘要

随着工业进程的深入，工业化发展迅速，石油化工行业也得到了迅猛的发展。同时也带了各种环境污染问题，炼油废水排放量大，油类物质浓度高，污染物成分复杂，直接排入自然水体或土壤对环境危害巨大，因此对炼油厂含有废水进行处理与回用是及其必要的。

本设计中炼油厂含油废进水水质情况：pH：6-9、石油类：

300-1200mg/L、COD Cr：500mg/L、BOD5：400mg/L、SS：500mg/L、NH4-N：25mg/L、S2-：20mg/L。根据炼油厂含油废水的水量、水质特点分析、结合当地自然条件、排水标准要求等因素，进行工艺比较及一系列参数论证，确定的工艺流程为：含油废水→细格栅→集水池→隔油罐→油水分离

器→调节池→一级涡凹气浮、二级溶气气浮→水解酸化→初沉池→A/O反应池→二沉池→臭氧消毒→出水。含油废水通过细格栅后进入集水池，经提升泵提升后进一次进入隔油池和油水分离器，去除大部分悬浮油，一级涡凹气浮和二级溶气气浮能去除废水中剩余的悬浮油和绝大部分分散油。水解酸化池能提高含油废水的可生化性，为后续的A/O工艺提供较为稳定的进水水质，A/O反应池由缺氧池和好氧池组成，具有良好的脱氨和降解有机物能力。经二沉池沉淀和臭氧消毒后出水。污泥经浓缩脱水后外运处置。

方案预计的出水水质各项指标：pH：6-9、石油类≤L、COD Cr≤50mg/L、BOD5≤10mg/L、SS≤50mg/L、NH4-N≤5mg/L、S2-≤L，达到《石油炼制工业污染物排放标准》（GB-31570-2015）中的水污染物排放要求。方案预期石油类去除率为99%以上，COD Cr去除率为90%以上、BOD5去除率为%以上、SS去除率为90%以上、NH4-N去除率为80%以上、S2-的去除率为%以上。

该工艺对炼油厂含油废水的处理具有良好的预期效果，与老工艺相比较具有明显得优点，运行稳定处理效果好，在炼油废水的处理具有广阔的应用前景。

关键词：含油废水；隔油；A/O工艺

Abstract

With the deepening of the industrial process, industrialization has developed rapidly, and the petrochemical industry has also developed rapidly. At the same time with a variety of environmental pollution problems, refinery wastewater emissions, oily substances, high concentration, complex composition of pollutants, directly discharged into natural water or soil is very harmful for the environment, so the refinery containing wastewater treatment and reuse is necessary and.

In this design, the water quality of oily waste water in refinery is: pH:6-9, petroleum: 300-1200mg/L, CODCr:500mg/L, BOD5:400mg/L, SS:500mg/L, NH4-N:25mg/L, S2-:20mg/L. According to the characteristics of water quality of oil refinery waste water, analysis, combined with the local natural conditions, drainage standards and other factors, the process and a series of parameter argumentation, determining the technological process: oily wastewater→sump→fine grid→isolation tank→oil-water separator→regulation pool→level two, CAF dissolved air flotation, hydrolysis acidification→primary sedimentation tank→A/O reactor→two sedimentation tank→ozone disinfection. Oily waste water by the fine grid into the sump,

the lift pump lifting a backward into the oil separation tank and oil-water separator, remove most of the suspended oil, a caf and two DAF suspension of the remaining oil in the wastewater and the vast majority of dispersed oil. The biodegradability of the hydrolysis acidification pool can improve the water quality of oily wastewater, provide more stable for the subsequent A/O process, A/O reactor is composed of anoxic and aerobic pool, with ammonia and organic matter degradation ability and good. After two settling tank precipitation and ozone disinfection, effluent. The sludge is treated by concentration and dehydration.

The effluent water quality indicators project expected: pH:6-9,

petroleum≤L ,COD Cr≤50mg/L, BOD5≤10mg/L, SS≤50mg/L, NH4-N≤5mg/L,

S2-≤L, to achieve industrial pollutant emission of petroleum refining Annotation (GB-31570-2015) requirements in the discharge of water pollutants. The plan is expected to remove more than 99% of petroleum, COD Cr removal rate is more than 90%, BOD5 removal rate is more than %, SS removal rate is more than 90%, NH4-N removal rate is more than 80%, and S2- removal rate is more than %.

Treatment of oil refinery wastewater by this process has the expected good results, compared with the old process has obvious advantages of stable operation, good treatment effect, and has broad application prospects in the treatment of refinery wastewater.

Key words:oily wastewater; oil separation; A/O process