腈纶纺丝装置后纺回用水深度净化研究
[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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