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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
作者单位E-mail
冯万里 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  
王沥东 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  
何伟煜 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  
旷哲 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  
张乐华 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 lezhanghua@163.com 
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
分类号:X703
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
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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