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Fractal theory in gender organic polymer flocculant to treat dyeing wastewater

Author: ZhangChunXiao
Tutor: ZhuMing
School: Sichuan Normal University
Course: Environmental Engineering
Keywords: Flocculation Fractal Theory Fractal dimension Dyeing wastewater Gender organic flocculants
CLC: X791
Type: Master's thesis
Year: 2010
Downloads: 90
Quote: 0
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Abstract


As a long time since the flocculation water treatment system, universal and an important part of a large number of scholars have done a lot on the the Flocculation Mechanism and technology methods in-depth study, but relatively weak floc growth process. In recent years, fractal theory began rapid development, it mainly reveals the unity of the nonlinear system of order and disorder, uncertainty and randomness unified, allows us to study the intrinsic randomness of nature nonlinear process has special regularity. Flocculation process, the floc growth process is a random, but it has a non-linear characteristics, it is the small particles grow large group process, internal and external part of the floc extreme irregularity and self-similarity , in line with the characteristics of fractal. Therefore, we can take advantage of the fractal theory to study the flocculation effect. Dyeing wastewater raw water pDMC-DMAEMA, pDMDAAC-FA as a flocculant, different cast plus the amount under different pH conditions flocculation test, respectively calculate the floc points shaped dimension, can be determined out of the test range the the two flocculants optimal dosage and optimal reaction pH value: (1) in a different dosage under the conditions, pDMC-DMAEMA processing wastewater floc fractal dimension between 1.2548 to 1.5234; pDMDAAC-FA wastewater treatment floc the fractal dimension of the body between 1.3470 to 1.5844. Under different pH conditions, pDMC-DMAEMA processing wastewater floc fractal dimension between 1.4225 to 1.6009; pDMDAAC-FA processing wastewater floc fractal dimension 1.4613 to 1.6541. (2) when the dosage is small for two flocculants showed smaller fractal dimension, fractal dimension with increasing dosage, as it started to increase, to reach a certain level gradually decreases trend. For pDMC-DMAEMA, optimal dosage to 140mg / L, the fractal dimension to 1.5234; For pDMDAAC-FA, the optimal dosage of 120mg / L, fractal dimension of 1.5844. (3) When the pH value of a single factor changes, pDMC-DMAEMA in the pH value is too small or too large, the fractal dimension is small, when the pH value of 7, the fractal dimension for 1.6009. pDMDAAC-FA at a pH of 7 time fractal dimension is 1.6541, in other pH range also preferably fractal dimension. Taken using a scanning electron microscope image of the floc fractal dimension calculated by non-linear mathematical methods to analyze drawn fractal The larger the value, the better the flocculation effect. The results illustrate that the fractal dimension of floc floc fractal dimension detection by actual production, analysis flocculation degree and flocculation processing effect, directly obvious. The fractal theory is applied to study polymer flocculant flocculation effect and showed good correlation with all parameters. The fractal dimension can be used as a parameter analysis of flocculation is good or bad, can be made on the actual production of flocculation conditions guidance.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > Light industrial waste disposal and comprehensive utilization > Textile, printing and dyeing industry
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