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冷冻解冻法废切削液破乳及其影响因素
冯万里,王沥东,何伟煜,旷哲,张乐华
0
(华东理工大学资源与环境工程学院, 国家环境保护化工过程环境风险评价与控制重点实验室, 上海 200237)
摘要:
进行了冷冻解冻法处理废切削液的实验研究,探讨了冷冻介质、解冻方法、冷冻温度、冷冻时间、NaCl投加量、pH等不同因素下的处理效果。在单因素实验的基础上,确定了最佳条件为:废液中盐质量浓度为0~0.02 g/L、pH 6.0~8.0时,不投加NaCl,不调节pH,在-8 ℃下冷冻8 h后常温解冻。在最佳条件下,废水化学需氧量(COD)去除率可达85.2%。采用生物显微镜观察废切削液经冷冻解冻法处理前后的微观图,发现处理后的废水油滴颗粒粒径在148 μm左右,相较之前明显变大,更易聚集分离。通过红外光谱分析检测废水处理后析出的产物,发现该黏稠物质主要为酯类物质。冷冻解冻法处理1 m3废切削液可以回收7.65 kg油脂类物质,需要耗电42.90 kW·h。研究表明,应用冷冻解冻法处理废切削液能有效破乳,提高废水可生化性,具有良好应用前景。
关键词:  冷冻解冻法  废切削液  含油废水  破乳
DOI:10.14135/j.cnki.1006-3080.2017.03.010
投稿时间:2016-09-12
基金项目:
Waste Cutting Fluid Demulsification and Its Influencing Factors by Freeze-Thaw Method
FENG Wan-li,WANG Li-dong,HE Wei-yu,KUANG Zhe,ZHANG Le-hua
(State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China)
Abstract:
The waste cutting fluid was treated by freeze-thaw method while the influences of freezing medium,thawing method,freezing temperature,freezing time,NaCl content and pH were investigated.On the basis of single factor test,the optimum conditions were as follows:the salt content in the waste liquid was 0-0.02 g/L and the pH was 6.0-8.0 without adding NaCl and pH adjustment,the waste cutting fluid was frozen 8 h at -8℃ and then thawed at room temperature.Under these optimum conditions,the COD removal rate of this waste water reached 85.2%.Using biological microscope to observe the microgram of waste cutting fluid before and after being frozen-thawed,the particle size of oil droplets in waste water was about 148 μm and they were significantly larger and easier to gather after freeze-thaw processing.The infrared spectra indicated that the waste cutting fluid precipitations was mainly esters.The treatment of 1 m3 waste cutting fluid can recover 7.65 kg of oil and grease,which consumes 42.90 kW·h.Freeze-thaw method is effective to recover esters from waste cutting fluid demulsification and to improve the biodegradability of waste water and to be a good application prospect.
Key words:  freeze-thaw method  waste cutting fluid  oily wastewater  demulsification

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