Optimization of freeze-air thawing process for cutting fluid wastewater pretreatment with response surface methodology
CHANG Yangyang1,2,3,, YU Jingjie1,2,3,,, WANG Shaopo1,2,3, QIU Chunsheng1,2,3, MA Huaji1,2,3 1.School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China 2.Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin 300384, China 3.Municipal Experimental Teaching Demonstration Center of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China
Abstract:The cutting fluid wastewater was pretreated by a freezing-air thawing method. Using single factor experiment and response surface methodology, the influences of the thawing time, freeze time and the cycle times of freezing-air thawing on TOC which was evaporated into the air and TOC percentages in the original cutting fluid wastewater TOC (ηvol、ηup、ηmid、ηlow) which remained at the upper-layer froth, middle-layer wastewater and lower-ayer wastewater were studied. Meanwhile the interactions of the above three factors and the optimal operating conditions were studied. The experimental results showed that the order of the influence factors for the pretreatment effluent (i.e. middle wastewater) was: the cycle times of freezing-air thawing > freezing time> thawing time. The optimization experimental results showed that when the freezing time was 19.84 h, thawing time was 6.94 h, and the cycle times of freeze-air thawing was 3 times, the lowest response value ηmid′ simulated by response surface method was 25.26%, and the actual measured value ηmid was 26.60% through three parallel validation experiments. After freezing-air thawing pretreatment, the average particle size of the oil droplets in the wastewater was significantly larger than that in the original cutting fluid wastewater, and the oil droplets in the froth layer existed in series or pieces. Key words:cutting fluid wastewater/ freezing/ air thawing/ response surface methodology.
图1冷冻-空气解冻前后切削液废水对比图 Figure1.Comparison diagram of cutting fluid wastewater before and after freezing-air thawing
图8解冻时间和冷冻-空气解冻总次数交互作用的等高线和响应曲面 Figure8.Contour lines and response surfaces of the interaction between thawing time and the cycle times of freezing-air thawing
图9冷冻时间和冷冻-空气解冻总次数交互作用的等高线和响应面 Figure9.Contour lines and response surfaces of the interaction between freezing time and the cycle times of freezing-air thawing
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1.School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China 2.Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin 300384, China 3.Municipal Experimental Teaching Demonstration Center of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China Received Date: 2020-12-26 Accepted Date: 2021-03-04 Available Online: 2021-05-23 Keywords:cutting fluid wastewater/ freezing/ air thawing/ response surface methodology Abstract:The cutting fluid wastewater was pretreated by a freezing-air thawing method. Using single factor experiment and response surface methodology, the influences of the thawing time, freeze time and the cycle times of freezing-air thawing on TOC which was evaporated into the air and TOC percentages in the original cutting fluid wastewater TOC (ηvol、ηup、ηmid、ηlow) which remained at the upper-layer froth, middle-layer wastewater and lower-ayer wastewater were studied. Meanwhile the interactions of the above three factors and the optimal operating conditions were studied. The experimental results showed that the order of the influence factors for the pretreatment effluent (i.e. middle wastewater) was: the cycle times of freezing-air thawing > freezing time> thawing time. The optimization experimental results showed that when the freezing time was 19.84 h, thawing time was 6.94 h, and the cycle times of freeze-air thawing was 3 times, the lowest response value ηmid′ simulated by response surface method was 25.26%, and the actual measured value ηmid was 26.60% through three parallel validation experiments. After freezing-air thawing pretreatment, the average particle size of the oil droplets in the wastewater was significantly larger than that in the original cutting fluid wastewater, and the oil droplets in the froth layer existed in series or pieces.