Fenton试剂预处理综合印染废水的实验研究

采用Fenton试剂预处理综合印染废水,改善其可生化性.结果表明,各影响因素的显著性大小顺序是n(H2O2)/n(Fe2+)＞H2O2投加量＞反应时间＞起始pH值;当n(H2O2)/n(F2+)为5～10、H2O2投加量在1.3～2.5mmol/L、Fenton反应时间为20～30min、起始pH为3～5时,COD去除率能稳定在40%以下,而B/C能稳定在0.3以上.     

Fenton法处理化学实验室有机废水

Fenton法具有氧化性强,操作便捷,反应迅速安全稳定等优点,对于高浓度有机废水有较好的实验效果。本文采用Fenton法对攀枝花学院化学实验室产生的有机废水进行处理,通过单因素实验,探讨了FeSO₄·7H₂O投加量、H₂O₂投加量、pH值、反应温度和反应时间等五个因素对有机废水COD去除率的影响。单因素实验结果表明：在pH值=3,H₂O₂投加量为2.0 mL/100mL,FeSO₄·7H₂O投加量为0.5 g/100mL,反应温度为50℃,反应时间为60 min, COD去除率达到最大为83%。在单因素的基础上,进行了正交实验,结果表明：四个影响因素对实验结果影响大小的顺序为：R2(pH)> R1(Fe²⁺/H₂O₂)>R4(反应时间)>R3(温度),四因素的最佳组合为：pH值=3,温度为50℃,Fe²⁺/H...     

絮凝法处理中药制药废水的试验研究

重庆大学郑怀礼教授等系统地研究了中药制药废水絮凝处理方法及其机理。所选絮凝剂有聚合氯化铝 ( PAC)、聚合硫酸铁 ( PES)以及自制的聚合硅酸硫酸铁 ( PFSS)等 ,研究了 p H、温度对絮凝效果的影响以及与有机阳离子高分子絮凝剂配合使用时的絮凝效果等。结果表明 ,PES较 PAC有更好的絮凝效果 ,但 PFSS更适合于该类废水的处理 ;每种絮凝剂都存在一最佳投药量 :PAC、PFS为 80～ 1 0 0 mg/L,PFSS为 1 .0 mg/L;有机阳离子高分子絮凝剂可增强 PFS、PAC的絮凝效果 ,而对 PFSS则影响不明显 ;水温在 2 0～ 40℃时对絮凝效果影响…     

UV/Fenton-混凝法对浮选废水预处理研究

试验考察了UV/Fenton法和CCG788/UV/Fenton法对浮选废水进行预氧化后,废水中COD去除效果的影响因素。其结果表明:UV/Fenton法处理效果明显优于普通Fenton法,而CCG788的加入提高了UV/Fenton体系对紫外光的利用率,不仅氧化效果更好,还可以促进UV/Fenton氧化反应的进行,缩短反应时间。在前述试验结果基础上,对CCG788/UV/Fenton法处理后的浮选废水投加CCG158进行了二次氧化,COD去除率可提高到87%,并缩短了总反应时长。     

焦化废水的预处理

针对焦化废水传统的生化污泥法的预处理工序存在的问题进行改造，较好地去除了废水中的油类物质，取得较为理想的效果。     

Fenton氧化-混凝工艺处理焦化废水的研究

采用Fenton试剂氧化-混凝沉淀法深度处理焦化生化处理二沉池出水,考察了H2O2投加量、Fe2+/H2O2(物质的量比)、PFS(聚合硫酸铁)投加量、pH值、反应时间对TOC和COD去除效果的影响,确定了适宜的反应条件。试验结果表明,TOC和COD去除率最高分别达到90.7%和72.7%,出水COD浓度达到GB 8978—1996《国家污水综合排放标准》一级。     

焦化厂废水预处理现状浅析

焦化厂采用常规好氧活性污泥法处理废水，本文针对废水预处理过程中设备、工艺、操作等方面存在的问题进行分析，并提出解决办法和建议。     

Fenton 絮凝工艺去除废水中的有机物试验

为了研究废水中有机物的去除问题,针对某企业含有机物废水进行了对比试验,采用了Fenton 絮凝联合工艺去除废水中的COD（化学需氧量）和浊度,考察了初始pH值、H2O2投加量、H2O2与Fe2+投加物质的量比、反应时间、絮凝剂投加量以及絮凝剂投加时的pH值对COD以及浊度去除效果的影响。结果表明,采用最佳工艺参数组合后,浊度去除率和COD的去除率分别为99.32%和97.27%。     

Cu2+作用下Fenton氧化处理苯酚废水研究

[目的]寻找Cu<'2+>存在条件下 Fenton 氧化处理苯酚模拟废水的最佳条件.[方法]研究不同浓度 H<,2>O<,2>、Fe<'2+>及 pH 下 Cu<'2+>的存在对 Fenton 氧化处理苯酚模拟废水的苯酚去除率的影响和对 COD 降解效果的影响.[结果]在苯酚浓度为 250 mg/L,最佳 pH 为 3.0,H<,2>O<,2>浓度为 297.5 mg/L,Fe<'2+>浓度为 140 mg/L 时,苯酚的最高去除率为 94.5%;在此条件下,Cu<'2+>浓度为 40 mg/L 时,苯酚最高去除率为 97.7%,提高了 3.2%.在 pH3.0、Cu<'2+>浓度 40mg/L 条件下,分别求得不同 Fe<'2+>/H<,2>O<,2>下的模型备件参数,结果表明 Fenton 氧化降解苯酚废水符合二级降解动力学反应模型.[结论]适当浓度的Cu<'2+>可提高 Fenton 氧化降解苯酚废水的效率.Fenton 氧化降解苯酚废水符合二级降解动力学反应模型.     

絮凝沉降结合Fenton法处理防锈包装材料废水

本实验涉及的防锈包装材料的设备清洗废水进水CODCr达到9606mg／l,且其中含有能抑制微生物生长的难降解有机物。利用絮凝沉降法Fenton法结合对该防锈材料包装厂的设备清洗废水进行生化处理前的预处理。实验结果表明,经过一次絮凝后CODCr由原来的9800mg／l降至5982mg／1,B／C值由原来的0．12升至0．21,仍然不适宜生化处理。经过Fenton法处理后CODCr最终降至3175mg／1,B／C值提升至0．52,适合后续生化处理。     

Fenton试剂去除聚丙烯酰胺的实验研究

阐述了PAM废水的成因和特点,以Fenton试剂为氧化剂通过氧化的方法去除水体中的过量PAM。探讨在去除PAM过程中H2O2与COD比值,pH值,H2O2与Fe2＋比值以及反应时间对去除效果的影响。通过实验,最佳的配比为：pH=4,H2O2/COD=2.5,Fe2＋/H2O2=1/10,在转速为250 r/min条件下,最佳反应时间为90 min。     

Pretreatment by Fenton Oxidation of an Amoxillin Wastewater

Relatively few reported works have dealt with wastewaters arising from amoxillin manufacture. To develop a treatment process for one such wastewater, several physicochemical methods such as coagulation, ultrafiltration, and Fenton oxidation (FO), have been investigated. Among these methods, FO proved effective. Consequently the method was further investigated to identify the appropriate H2O2/FeSO4 ratio, FeSO4 and H2O2 concentrations, and reaction pH and temperature. In relation to the wastewater, a suitable H2O2/FeSO4 weight ratio was 5:1 (molar ratio: 22.4:1) with H2O2 and FeSO4 concentrations at 20?g/L, 4?g/L, respectively. The corresponding pH range was 2.0–4.0 while the reaction temperature was 60°C. Given these conditions, wastewater total organic carbon was reduced by 48.8–49.4%. After FO treatment, reverse osmosis (RO) effectively reduced the dissolved salt content. The contribution of FO and RO pretreatment improved the wastewater’s biodegradability thus making a downstream biotreatment polishing process viable.     

芬顿氧化法处理焦化废水中的过程控制

济钢焦化废水处理采用A2O2-混凝沉淀-芬顿氧化工艺。芬顿氧化法在运行过程中常因Fenton试剂配比([Fe2+]/[H2O2])及絮凝剂的投加量较难控制等原因,出现出水COD超标,出水浑浊、悬浮物超标,出水发绿等问题。通过采取及时对硫酸亚铁和双氧水投加量进行微量调节,及时排泥、定期清理Y型过滤器,及时人工添加氢氧化钠溶液等相应措施,保证了出水水质稳定达到国家二级排放标准,最好时COD控制为70 mg/L。     

微电解-JS试剂法处理印染废水的研究

印染废水是一种成分复杂、处理难度大、毒性高的工业废水,对环境危害极大.针对印染废水选择了合适的预处理方式,并建立一种微电解-JS试剂法处理印染废水的工艺.印染废水首先通过酸化絮凝预处理,再利用自制高活性微电解填料协同自行开发的JS试剂处理,最后通过加入石灰调节pH值为9,并进行混凝沉淀,废水色度基本脱除,COD含量降至...     

平整废液芬顿试剂氧化试验研究

平整废液是带钢冷精轧过程中产生的一种废液,是一种较难处理的高浓度有机废水,其生化性较差,传统的生物处理难以奏效,对于此类废水,国内外尚无成熟的处理工艺。采用芬顿（Fenton）氧化工艺对某公司生产的平整液进行了试验研究,研究了初始pH值、硫酸亚铁投加量、H2O2投加量以及混凝pH值等因素对COD去除效果的影响。通过试验研究,确定了反应温度、初始pH值、FeSO4和H2O2投加量等最佳处理工艺条件。在最佳处理条件下,COD去除率可达56%,同时BOD5/COD由0.17提高到0.48,废水的可生化性得到明显改善,可以满足后续生化处理的进水要求。     

Degradation of MTBE Intermediates using Fenton’s Reagent

In a previous study, the chemical oxidation of methyl tert-butyl ether (MTBE) at low concentrations in water using Fenton’s reagent (FR) was investigated. At certain reaction conditions the process achieved 99.99% degradation of MTBE but it did not result in complete MTBE mineralization. In the present study, the major intermediate by-products generated during the reaction, such as tert-butyl formate (TBF), tert-butyl alcohol (TBA), methyl acetate, and acetone were separately used as parent contaminants and treated under the same reaction conditions initially used for MTBE (i.e., pH of the water, molar ratio of pollutant to FR) in order to compare their degradability by hydroxyl radicals generated from Fenton’s reaction. The results were compatible with the second order reaction rate constants for the reaction of hydroxyl radicals with each contaminant commonly available in the literature. The comparison of the degradation kinetics for each intermediate by-product provided information that aims at unveiling the limiting step(s) of the entire MTBE degradation pathway. In this context, it was found that (1) TBA was generated by reactions subsequent to those that produced TBF, (2) acetone was originated by at least three independent pathways involving direct hydroxyl radical attack on MTBE, TBF, and TBA, and (3) methyl acetate was formed exclusively from MTBE.     

Destruction of a Carbon Tetrachloride Dense Nonaqueous Phase Liquid by Modified Fenton’s Reagent

Destruction of a dense nonaqueous phase liquid (DNAPL) by soluble iron (III)-catalyzed and pyrolusite (β-MnO2)-catalyzed Fenton’s reactions (hydrogen peroxide and transition metal catalysts) was investigated using carbon tetrachloride (CT) as a model contaminant. In the system amended with 5 mM soluble iron (III), 24% of the CT DNAPL was destroyed after 3 h while CT dissolution in parallel fill-and-draw systems was minimal, indicating that CT was degraded more rapidly than it dissolved into the aqueous phase. Fenton’s reactions catalyzed by the naturally occurring manganese oxide pyrolusite were even more effective in destroying CT DNAPLs, with 53% degradation after 3 h. Although Fenton’s reactions are characterized by hydroxyl radical generation, carbon tetrachloride is unreactive with hydroxyl radicals; therefore, a transient oxygen species other than hydroxyl radicals formed through Fenton’s propagation reactions was likely responsible for CT destruction. These results demonstrate that Fenton-like reactions in which nonhydroxyl radical species are generated may provide an effective method for the in situ treatment of DNAPLs.     

A/O作为前处理工艺处理生活污水研究

[目的]研究A/O工艺对污染物的净化效果.[方法]以A/O作为人工湿地处理的前处理工艺,研究了水力停留时间、混合液回流比对A/O去污效果的影响.[结果]在温度15℃左右、A/O工艺水力停留时间3.4 h、混合液回流比1.0时,COD去除率这60%.[结论]出水浓度满足城镇污水处理厂污染物排放二级标准(GB18918-2002)和人工湿地后续处理要求.