城市污水污泥和锌电镀污泥资源化利用对亚甲基蓝的吸附催化降解作用

发布时间：2018-03-01 23:11

本文关键词： 城市污水污泥锌电镀污泥活性炭亚甲基蓝紫外光芬顿　出处：《上海大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着印染工业的快速发展,印染过程产生的印染废水形成的污染,是中国目前亟待解决的重要环境矛盾。城市污水污泥是污水处理系统产生的副产物,含有大量有毒有害物质,如持久性有机污染物及重金属等。传统的污泥处理方法有浓缩、稳定、调理、脱水、干燥、焚烧等,传统的处置方法有填埋、土地利用和建筑材料综合利用。随着环境标准的越来越严格和污泥传统处理与处置方法弊端的逐渐显现,亟需找到新的处理与处置方法。锌电镀污泥是锌电镀行业中经废水处理后含重金属的污泥废弃物,作为一种危险废弃物,采取有效方式,实现电镀污泥的减量化、无害化和资源化一直是国内外学者研究的热点。从污水污泥和锌电镀污泥资源化及以废治废思路出发,本论文探究了污泥活性炭、锌电镀污泥催化剂和污泥活性炭负载锌电镀污泥催化剂对亚甲基蓝的去除可行性。研究得到的主要结论如下:(1)污泥活性炭对亚甲基蓝具有吸附去除能力。实验通过吸附热力学、动力学和材料再生性,探讨污泥活性炭对亚甲基蓝的最佳吸附去除条件。结果发现:污泥活性炭处理浓度为100 mg/L的亚甲基蓝时,最佳投加量和最佳吸附温度分别为6.0 g/L和35 oC;低溶液p H值不利于吸附;吸附达到平衡所需时间、平衡吸附量与溶液初始浓度具有一定关系,随初始浓度的升高,平衡所需时间增长,平衡吸附量增加;20 oC时,污泥活性炭吸附亚甲基蓝的饱和吸附量为26.15 mg/g,等温吸附线符合Langmuir吸附模型,亚甲基蓝在活性炭表面以单分子层吸附为主;污泥活性炭吸附亚甲基蓝的动力学模型符合准二级动力学模型;污泥活性炭吸附饱和后,通过热处理的再生效率较高,三次再生效率保持在86.0%。(2)锌电镀污泥衍生材料对亚甲基蓝具有紫外光催化能力。实验通过不同处理方法制备了多种锌电镀污泥催化剂,包括煅烧锌电镀污泥催化剂、酸浸电镀污泥催化剂以及负载酸浸电镀污泥催化剂,并考察比较了它们对亚甲基蓝的紫外光催化降解能力,结果发现:煅烧锌电镀污泥2 h紫外光催化降解亚甲基蓝的脱色率不到2%,基本无光催化活性;通过调整锌污泥组分形态,制备出具有一定光催化降解亚甲基蓝活性的酸浸电镀污泥催化剂和负载酸浸电镀污泥催化剂,且负载酸浸电镀污泥催化剂的活性更高,2 h的紫外光催化亚甲基蓝脱色率为11.3%,对应脱色量为2.825mg/g。(3)污泥活性炭负载锌电镀污泥催化剂对亚甲基蓝具有良好的紫外光芬顿降解能力。煅烧电镀污泥具有良好的光芬顿活性。在0.4 g煅烧锌电镀污泥、2 mmol/L H2O2以及11 W紫外灯条件下,催化降解500 m L、50 mg/L的亚甲基蓝,2 h可以取得85.13%的脱色率,COD去除率为70.33%。通过形态研究发现,煅烧电镀污泥的主要组分是Zn Fe2O4;当污水污泥和煅烧电镀污泥以1:1混合时,制得复合催化剂的光芬顿活性最高。在0.4 g污泥活性炭负载电镀污泥催化剂、2 mmol/L H2O2以及11 W紫外灯条件下,催化降解500 m L、50 mg/L的亚甲基蓝,2 h可以取得86.26%的脱色率,脱色量为53.91 mg/g,且COD去除率为80.54%,高于相同条件下的煅烧电镀污泥。污泥活性炭负载电镀污泥实现了污水污泥和锌电镀污泥的共同资源化,通过结合提升了光芬顿降解能力,实现了亚甲基蓝等印染废水的有效去除。
[Abstract]:With the rapid development of printing and dyeing industry, printing and dyeing printing and dyeing wastewater generated in the process of the formation of environmental pollution, is an important Chinese contradiction to be solved at present. The city sewage sludge is a by-product of the wastewater treatment system, containing a large amount of toxic and harmful substances, such as persistent organic pollutants and heavy metals. Traditional sludge treatment methods have concentrated and stable, conditioning, dewatering, drying, incineration, landfill disposal of the traditional method, the comprehensive utilization of land use and building materials. With the gradually more and more strict environmental standards and traditional sludge treatment and disposal methods of disadvantages, need to find a new method of treatment and disposal of sludge. Zinc electroplating sludge is the waste zinc in electroplating industry the treated wastewater containing heavy metals, as a kind of hazardous waste, take effective measures to achieve the electroplating sludge reduction, harmless and resource has been at home and abroad Hot research. From sewage sludge and zinc electroplating sludge and bywaste perspective, this paper explores the sludge activated carbon, zinc electroplating sludge catalyst on removal of methylene blue supported zinc electroplating sludge catalyst and feasibility of sludge activated carbon. The main conclusions are as follows: (1) the sludge with activated carbon the adsorption ability of methylene blue. The adsorption thermodynamics, kinetics and regeneration of materials, to explore the best conditions on the removal of sludge activated carbon adsorption of methylene blue. The results showed that the sludge activated carbon concentration of 100 mg/L methylene blue, optimal dosage and adsorption temperature were 6 g/L and 35 oC low; P solution H value is not conducive to adsorption; the adsorption equilibrium time required, there is a certain relation between the adsorption capacity and the initial concentration of the solution, with the increase of the initial concentration, the time needed to balance growth. The amount of increase; 20 oC, saturated adsorption capacity of sludge activated carbon adsorption of methylene blue was 26.15 mg/g, the adsorption isotherm accords with Langmuir adsorption model and methylene blue on the surface of activated carbon with single molecule layer adsorption kinetics model; sludge activated carbon adsorption of methylene blue with the pseudo two order kinetics model; sludge activated carbon adsorption after the high regeneration efficiency of heat treatment, the three regeneration efficiency is maintained at 86.0%. (2) zinc electroplating sludge derived materials with UV catalytic ability of methylene blue. The experimental preparation of various zinc electroplating sludge catalysts by different processing methods, including calcination of zinc electroplating sludge catalyst, catalyst leaching and acid leaching of electroplating sludge from electroplating sludge catalyst the load and the effects of acid, compared their ability of photocatalytic degradation of methylene blue was found: Calcined zinc electroplating sludge 2 h UV catalytic degradation of Methylene blue decolorization rate of less than 2%, basically no photocatalytic activity; by adjusting the zinc sludge composition form, prepared with the photocatalytic degradation of methylene blue active acid leaching of electroplating sludge catalyst and catalyst acid leaching of electroplating sludge, and the load of acid leaching of electroplating sludge catalyst with higher activity, 2 h UV light photocatalyticdegradation of methylene blue decolorization rate was 11.3%, the corresponding decolorization amount was 2.825mg/g. (3) zinc electroplating sludge catalyst has good UV Fenton degradation ability of methylene blue on sludge activated carbon calcination of electroplating sludge with light load. Fenton lived well. In 0.4 g calcined zinc electroplating sludge, 2 mmol/L H2O2 and 11 W UV light conditions under the catalytic degradation of 500 m L, 50 mg/L, 2 h of methylene blue, you can get 85.13% decolorization rate, COD removal rate of 70.33%. by morphological study found that the main group of electroplating sludge is calcined Zn Fe2O4; when the sewage pollution The mud and calcination of electroplating sludge mixed with 1:1, Fenton prepared the highest activity of composite catalyst. The catalyst activity in the electroplating sludge load of 0.4 g H2O2 and 2 mmol/L sludge carbon, 11 W UV lamp under the condition of catalytic degradation of 500 m L, 50 mg/L, 2 h of methylene blue, you can get 86.26% decolorization rate, the decolorization rate was 53.91 mg/g, and the removal rate of COD was 80.54%, higher than the calcination of electroplating sludge under the same conditions. The recycling of sewage sludge and zinc electroplating sludge load of electroplating sludge sludge activated carbon, by combining the improved Fenton light degradation capability, can effectively remove methylene blue dyeing wastewater.

【学位授予单位】：上海大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703;X791

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