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腈纶纺丝装置后纺回用水深度净化研究

发布时间:2019-01-19 15:33
【摘要】:论文按照“源头治理”的思路,提出采用“混凝沉降法+物理吸附”联合处理工艺处理腈纶纺丝后纺废水。分别考察并确定了絮凝沉降、混凝沉降、活性炭物理吸附,以及活性炭再生等工序较适宜的工艺条件,并借助Zeta电位分析、FESEM、激光粒度分析等现代分析测试技术对絮凝沉降、混凝沉降、活性炭物理吸附等过程机理进行了初步探讨,所得实验结果和主要结论如下:(1)采用絮凝沉降法处理腈纶纺丝后纺废水,以处理后水样的浊度为主要考察指标,筛选并确定PAC为较适宜的絮凝剂,通过单因素条件实验和正交实验考察并确定较适宜的絮凝沉降工艺条件,优化条件下的重复实验结果显示处理后水样的平均浊度为0.51NTU,浊度去除率达到86.64%。(2)采用混凝沉降法处理腈纶纺丝后纺废水,以PAC为絮凝剂,CPAM为助凝剂,以处理后水样的浊度为主要考察指标,通过单因素条件实验和正交实验考察并确定较适宜的混凝沉降工艺条件,优化条件下的重复实验结果显示处理后水样的平均浊度为0.22NTU,浊度去除率达到96.30%。(3)活性炭静态物理吸附:.以CODcr为主要考察指标,通过对比筛选实验,确定4#活性炭(材质烟煤)为较适宜的物理吸附剂,考察并确定较适宜的活性炭静态吸附工艺条件,重复实验结果显示处理后水样的平均浊度为0.13NTU1NTU,浊度去除率达到97.81%;平均CODcr为 10.3mg·L-150mg·L-1, CODcr去除率达到85.4%,达到后纺废水回用的经济技术指标要求。(4)采用低温加热再生方法对饱和活性炭进行再生,确定活性炭低温加热再生方式为马弗炉(空气氛)加热和较适宜的再生工艺条件,此条件下,再生循环次数1~3次时,再生后活性炭的综合恢复率均可达到70%以上。(5)对“混凝+物理吸附”工艺的处理成本进行了初步估算,结果表明,活性炭循环使用四次时,每处理1吨腈纶纺丝后纺废水的成本大约为0.45元,显示出很强的成本优势。
[Abstract]:According to the idea of "Source treatment", the combined treatment process of "coagulation and sedimentation physical adsorption" was put forward to treat acrylic fiber spinning wastewater. The proper technological conditions of flocculation settlement, coagulation sedimentation, activated carbon physical adsorption and activated carbon regeneration were investigated and determined respectively. The flocculation settlement was measured by Zeta potential analysis, FESEM, laser particle size analysis and other modern analytical techniques. The mechanism of coagulation sedimentation and physical adsorption of activated carbon were preliminarily discussed. The experimental results and main conclusions were as follows: (1) flocculation sedimentation method was used to treat acrylic fiber spinning wastewater, and the turbidity of treated water sample was taken as the main index of investigation. PAC was selected as the most suitable flocculant. The optimum flocculation conditions were determined by single factor experiment and orthogonal experiment. The results of repeated experiments under optimized conditions showed that the average turbidity of treated water was 0.51NTU. The turbidity removal rate reached 86.64. (2) the flocculation sedimentation method was used to treat the acrylic spinning wastewater. PAC was used as flocculant, CPAM as coagulant aid, and the turbidity of treated water as the main index of investigation. Through single factor experiment and orthogonal experiment, the optimum conditions of coagulation sedimentation were determined. The results of repeated experiments under optimized conditions showed that the average turbidity of treated water sample was 0.22 NTU. Turbidity removal rate reached 96.30. (3) static physical adsorption of activated carbon:. Taking CODcr as the main index of investigation, through the comparative screening experiment, we determined the activated carbon (coal of raw material) as the more suitable physical adsorbent, investigated and determined the more suitable technology condition of the static adsorption of activated carbon. The results of repeated experiments showed that the average turbidity of treated water was 0.13 NTU1NTU, and the turbidity removal rate reached 97.81%. The average CODcr was 10.3mg L-150mg L -1, and the removal rate of CODcr reached 85.4%, which met the economic and technical requirements for the reuse of waste water. (4) the saturated activated carbon was regenerated by low temperature heating. It is determined that the regeneration method of activated carbon under low temperature heating is a suitable process condition for heating and regeneration in muffle furnace (air atmosphere). Under this condition, when the regeneration cycle is 1 ~ 3 times, The comprehensive recovery rate of regenerated activated carbon can reach more than 70%. (5) the treatment cost of "coagulation physical adsorption" process is preliminarily estimated. The results show that when the activated carbon is recycled four times, The cost of treating 1 ton of acrylic spinning wastewater is about 0.45 yuan, which shows a strong cost advantage.
【学位授予单位】:合肥工业大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:X783.4

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