【摘要】 船舶洗舱废水直接排放会污染环境,排放前必须经过各种处理工艺的净化,而含油废水处理是其中的重点和难点。实验选取重庆某公司洗船中心最不利工况下的高COD洗舱含油废水,通过混凝破乳和芬顿氧化进行处理,分析了混凝破乳过程中混凝剂种类、投加量、pH值和搅拌时间等影响因素,确定了芬顿氧化过程的适宜条件,包括H₂O₂浓度、Fe²⁺浓度、反应时间等,并通过正交实验确定了洗舱含油废水预处理的最优条件。结果表明:PAC为适宜的无机混凝剂,其混凝破乳适宜的投加量为75 mg/L、初始pH值为8、搅拌时间为3 min;芬顿氧化适宜的H₂O₂和Fe²⁺浓度分别为12 500和1 250 mg/L、反应时间为120 min。在最优条件下,实验水样的COD总去除率可达70%,TP和石油类几乎全部去除。本研究成果为长江沿岸某城市港口洗舱废水处理项目的预处理工艺提供了工程设计和调试运行的理论指导。更多还原

【Abstract】 Discharging the wastewater from ship washing directly will pollute the environment, so it has to be processed before discharging, among which the treatment of oily wastewater is an important and difficult task. The high COD oily wastewater from a Chongqing company’s ship washing center under the most unfavorable condition was taken as the research object, which was treated by the combined process of coagulation demulsification and Fenton oxidation. During the coagulation demulsification process, the type, dosage, pH value and stirring time of the coagulants were analyzed, suitable conditions in the Fenton oxidation process were also determined, including H₂O₂ concentration, Fe²⁺ concentration and reaction time. Then the optimal conditions for oily wastewater pretreatment were determined through orthogonal experiments. The results show that PAC is a suitable inorganic coagulant, and the suitable dosage for the coagulation demulsification process is 75 mg/L, the initial pH value is 8, and the stirring time is 3 min. The suitable H₂O₂ and Fe²⁺ concentration for Fenton oxidation is 12, 500 mg/L and 1, 250 mg/L respectively, while the reaction time is 120 min. Under optimal conditions, the total COD removal rate of the experimental water samples can reach 70%, in addition, TP and petroleum are almost completely removed. This work provides a theoretical guidance for the engineering design and commissioning of the ship washing wastewater pretreatment project at a certain port of the Yangtze River.更多还原