石灰混凝法处理2-氨基-4-乙酰氨基苯甲醚生产废水实验研究

发布时间：2018-09-04 13:27

【摘要】：染料中间体种类繁多,其生产废水成分复杂,处理难度大,色度高,毒性大,是水处理行业当中的一个热点和难点。2-氨基-4-乙酰氨基苯甲醚(简称AMA)就是其中的一种,生产该产品的工艺中会产生大量副产物,主要是2-硝基-4-甲氧基苯胺和3-硝基-4-甲氧基苯胺,同时废水中也含有大量硫酸和醋酸等,酸度极大。单纯使用化学氧化法处理成本较高。本课题以某染化厂废水为研究对象,采用石灰混凝法对2-硝基-4-乙酰氨基苯甲醚的生产废水进行石灰混凝预处理和Fenton反应后的石灰-聚合氯化铝-聚丙烯酰胺联用混凝处理。本实验拟通过单因素实验、正交实验和响应面实验,研究预处理中石灰乳制备中氧化钙的粒径,反应搅拌强度以及沉淀时间对污染物去除效果的影响,和对芬顿氧化反应出水进行进一步混凝时,混凝剂聚合氯化铝(PAC)和聚丙烯酰胺(PAM)的投加量,pH值等因素对沉降效果和去除效果的影响。以期得出该类废水的预处理和深度混凝工艺的最佳条件,提高处理效果,降低处理成本。通过正交实验所得石灰混凝法预处理最佳反应条件为:氧化钙粒径为200目,搅拌强度为1100r/min,沉淀时间为90min,2-硝基-4-甲氧基苯胺浓度从446mg/L降至240.4mg/L,去除率达到46.1%;3-硝基-4-甲氧基苯胺从1338 mg/L降至1149mg/L,去除率达到14.1%;色度从9000倍降至7461倍,去除率达到17.1%。通过响应曲面实验所得芬顿氧化出水混凝处理最佳反应条件为:PAC投加量为1.15g/L,PAM投加量为0.018g/L,pH为7.7。2-硝基-4-甲氧基苯胺和3-硝基-4-甲氧基苯胺浓度分别从98mg/L和102mg/L降至25.38mg/L和36.41mg/L,对2-硝基-4-甲氧基苯胺和3-硝基-4-甲氧基苯胺去除率分别为74.1%和64.3%。
[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.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X788

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