石灰混凝法處理2-氨基-4-乙酰氨基苯甲醚生產(chǎn)廢水實(shí)驗(yàn)研究
[Abstract]:There are many kinds of dyestuff intermediates, the components of wastewater are complex, the treatment is difficult, the chrominance is high, and the toxicity is great. It is one of the hot and difficult spots in water treatment industry. The 2-amino-4-acetaminomethyl ether (AMA) is one of them. A large number of by-products, mainly 2-nitro-4-methoxy aniline and 3-nitro-4-methoxy aniline, are produced in the process of producing this product. At the same time, there are a lot of sulfuric acid and acetic acid in the wastewater, so the acidity is great. The cost of chemical oxidation is high. In this paper, the wastewater from a dyeing and chemical plant was studied. The waste water from 2-nitro-4-acetaminomethyl ether was treated by lime coagulation pretreatment and Fenton reaction combined with lime polyaluminium chloride and polyacrylamide. Through single factor experiment, orthogonal experiment and response surface experiment, the effect of calcium oxide particle size, reaction agitation intensity and precipitation time on the removal of pollutants in the preparation of lime milk was studied. And when the water from Fenton oxidation reaction was further coagulated, the effects of the dosage of polyaluminum chloride (PAC) and polyacrylamide (PAM) on sedimentation and removal efficiency were investigated. In order to obtain the best conditions of pretreatment and deep coagulation process of this kind of wastewater, improve the treatment effect and reduce the treatment cost. The optimum pretreatment conditions of lime coagulation method obtained by orthogonal experiment are: the particle size of calcium oxide is 200 mesh, The stirring intensity was 1100r / min, the precipitation time was 90min, the concentration of 2-nitro-4-methoxyaniline decreased from 446mg/L to 240.4 mg / L, and the removal rate of 3- nitro-4-methoxyaniline decreased from 1338 mg/L to 1149mg / L, the removal rate reached 14.1mg / L, and the chromaticity decreased from 9000 times to 7461 times, and the removal rate reached 17.1g / L. The optimum reaction conditions for flocculation treatment of Fenton oxidized effluent were obtained by response surface experiment. The optimum reaction conditions were as follows: the dosage of 1. 15g / L% PAM was 0.018g / L = 0.018g / L = 7.7.2-nitro-4-methoxy aniline and the concentration of 3-nitro-4-methoxyaniline decreased from 98mg/L and 102mg/L to 25.38mg/L, respectively. The removal rates of 2-nitro-4-methoxyaniline and 3-nitro-4-methoxyaniline were 74.1% and 64.3%, respectively.
【學(xué)位授予單位】:中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:X788
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