芬顿试剂(Fenton's reagent法降解对苯二酚和工业废水

可溶性亚铁盐和H2O2的组合称为芬顿试剂(Fenton’s reagent),是一种氧化能力很强的氧化剂,常用于废水的净化处理。本文以对苯二酚为代表物,探讨用Fenton试剂氧化的反应条件,并用最佳的实验条件处理工业废水,90分钟工业废水的COD去除率可达71.6％。

Exploitation of Fenton and Fenton-like reagents as alternative conditioners for alum sludge conditioning

The use of Fenton＇s reagent （Fe^2＋/H2O2） and Fenton-like reagents containing transition metals of Cu（Ⅱ）, Zn（Ⅱ）, Co（Ⅱ）, and Mn（Ⅱ） for an alum sludge conditioning to improve its dewaterability was investigated. The results obtained were compared with those obtained from conditioning the same alum sludge using cationic and anionic polymers. Experimental results show that Fenton＇s reagent was the best among the Fenton and Fenton-like reagents for the alum sludge conditioning. A considerable effectiveness of capillary suction time （CST） reduction efficiency of 47% can be achieved under test conditions of Fe^2＋/H2O2 = 20/125 mg/g DS （dry solid） and pH 6.0. The observation of floc-like particles after Fenton＇s reagent conditioning of alum sludge suggested that the mechanism of Fenton＇s reagent conditioning was different from that of polymer conditioning. In spite of the lower efficiency in the CST reduction of Fenton＇s reagent in alum sludge conditioning compared to that of polymer conditioning, Fenton＇s reagent offers a more environmentally safe option. Tiffs study provided an example of proactive treatment engineering, which is aimed at seeking a safe alternative to the use of polymers in sludge conditioning towards achieving a more sustainable sludge management strategy.

Treatment of Wastewater Containing RDX by Fenton's Reagent

Fenton's reagent was employed to treat the wastewater containing RDX.The effects of FeSO4 concentration,H2O2 concentration,pH value,reaction time,temperature and initial COD of wastewater on residual COD of wastewater were investigated.The results show that the optimum FeSO4 concentration and pH are 700 mg/L and 2.5,respectively,and the residual COD of wastewater decreases with the rise in H2O2 concentration,but increases with the rise in temperature.After Fenton's reagent treatment,the initial COD of less than 874 mg/L wastewater can meet effluent standard.Under conditions of 100 mg/L H2O2,437 mg/L initial COD and 15 ℃ temperature,the lowest residual COD is obtained at 83.80 mg/L in 5 min.

Degradation of polyvinyl-alcohol wastewater by Fenton’s reagent: Condition optimization and enhanced biodegradability

The pretreatment of refractory polyvinyl-alcohol （PVA） wastewater with low value of CODcr by Fenton＇s reagent was investigated to enhance the biodegradabilily. The effects of operating conditions such as pH of the solution, Fe2＋ dosage, H2O2 dosage, reaction time and initial PVA concentration on the removal efficiency of CODCr were discussed. It is demonstrated that the optimum value of pH for removal of CODcr is 5 and the most suitable dosages of H2O2 （2%） and FeSO4 （10 mg/L） are 5% and 8.0%, respectively. When the initial CODcr value of the PVA water is 760 mg/L, the favorable reaction time is 110 min. Under these optimum conditions, the removal ratio of CODcr is 58.6% 61.4%, and the value of biodegradability （CODB/CODcr） increases markedly from 8.9% 9.7% to 62.6% 68.3%.

Degradation of 4-Chlorophenol Solution by Synergetic Effect of Dual-frequency Ultrasound with Fenton Reagent

4-Chlorophenol (4-CP) solution was treated by dual-frequency ultrasound inconjunction with Fenton reagent, and obvious improvement in the 4-CP degradation rate was observedin this advanced oxidation process. Experimental results showed that ultrasonic intensity,saturating gas and pH value affected greatly the 4-CP removal rate. Among four different saturatinggases (Ar, O_2, air and N_2), 4-CP degradation with Ar-saturated solution was the best. However, inthe view of practical wastewater treatment, using oxygen as the saturating gas would be moreeconomical. The addition of Fenton reagent followed the first-order kinetics and increased the 4-CPdegradation rate. The 4-CP removal rate increased by around 126% within 15 min treatment. Thesynergetic effect of dual-frequency ultrasound with Fenton reagent on 4-CP degradation was obviouslyobserved.

Oxidation of Partially Hydrolyzed Polyacrylamide from Polymer Flooding Processes Using Fenton Reagents

The degradation of partially hydrolyzed polyacrylamide(HPAM) found in alkaline/surfactant/polymer flooding sewage was investigated using Fenton-type reagents. Different Fenton reagent treatments for HPAM degradation were compared. The effects of pH, hydrogen peroxide(H_(2)O_(2)), ferrous ion(Fe^(2+)), and tartaric ion(C_(4)H_(4)O_(6)^(2-)) concentrations were studied. The degradation reaction occurred within a wide range of pH(3–9). The HPAM degradation performance of photo-Fenton processes using solar light and UV were compared with that of the Fenton process. The degradation rate was found to be strongly dependent on the H_(2)O_(2)/Fe^(2+)/C_(4)H_(4)O_(6)^(2-)molar ratio. The HPAM degradation efficiency was 90%, and the chemical oxygen demand removal efficiency was 85%. HPAM could be degraded into a compound with a lower molecular weight, but it was difficult to achieve complete mineralization to CO_(2). The presence of intermediate products hindered further oxidation in the Fenton process.

Degradation of Silicone Rubbers in Fenton's Reagents

Gaskets are applied in PEMFCs（proton exchange membrane fuel cells） to keep reactant gases and liquid within their respective regions, which are of great significance for the both sealing and electrochemical performance of fuel cells during the long-term operation. In this study, the degradation of silicone rubbers, often selected as seals in PEMFCs, in Fenton＇s reagents with different H_2O_2 concentrations was investigated. The changes in chemical properties, mechanical behavior and surface morphology of the samples were studied before and after exposure to the test environment over time. It is found that increasing H_2O_2 concentration will degrade the rubbers more severely. The experimental results elucidate the degradation mechanism of silicone rubbers in Fenton＇s reagents and the influence of H_2O_2 in the degradation process.

Catalytic oxidation degradation of phenol in wastewater by heterogeneous Fenton reagent

Heterogeneous Fenton reagent, as a strong oxidizer, has been used widely in the treatment ofwastewater. We prepared Fe2O3/γ-Al2O3 catalyst by impregnation method and characterized it by powder X-ray diffraction （XRD） and X-ray photoelectron spectroscopy （XPS）, scanning electron microscopy （SEM）. Test results show that Fe203 crystal was compounded on the γ-Al2O3 carder. We tested and optimized Fe203/γ-Al2O3 /H2O2 and Fe2O3/γ-Al2O3 /H2O2/UV processes to remediate organic material of phenol, using phenol solution with an in. itial concentration of 250 mg/L as a representative of phenolic industrial Wastewater. The preparation conditions were optimized based on performance of Fe2Oa/γ-Al2O3 catalyst and the processes to degrade phenol in aqueous environments. The experimental results showed that the phenol removal perfomance with Fe2O3/γ-Al2O3 /H2O2/UV was more complete than with Fe2O3/γ-Al2O3 /H2O2 and degradation rate of phenol reached 89.4% and 94.7% respectively after reaction for2 h.

Fenton试剂法在工业有机废水中的处理研究

本文针对工业有机废水处理中的问题,探讨了Fenton试剂法在工业有机废水处理中的应用和处理策略。首先,分析了工业有机废水处理中的挑战,包括废水中有机物浓度高、毒性较强、处理难度大等问题。其次,介绍了Fenton试剂法的原理及特点。最后,探讨了Fenton试剂法在处理工业有机废水时的优化策略,以期为实际工程应用提供参考。

Fenton试剂处理废水中各影响因子的作用机制

以洗胶废水为研究对象初步研究了 Fenton试剂处理有毒有机废水时各影响因子的作用机制 ,通过正交实验确定了 Fen-ton反应各种影响因子的最佳操作条件为 :[H2 O2 ]=0 .2 mol· L- 1、[Fe2 +]=40 mmol· L- 1、反应温度 85℃ ,反应时间 60 min、反应体系的 p H值为 3左右 .此条件下废水 COD的去除率普遍大于 80 % .试验发现紫外光和配体络合物可提高 Fenton试剂对有机物的降解能力 .在各影响因子与 COD去除率的关系曲线基础上 ,分析了混合废水中各影响因子的作用机理和综合反应机理的关键及控制步骤 ,提出了改进的思路 .

Fenton试剂催化氧化降解含硝基苯废水的特性

探讨不同氧化剂和催化剂浓度下Fenton试剂氧化降解硝基苯的作用规律 ,用一元线性回归方程对不同氧化降解时间后硝基苯的相对残余浓度对反应时间的相关性进行了定量分析 ,结果发现硝基苯的Fenton试剂氧化降解符合一级反应动力学模式 ,通过回归求出了各反应条件下的一级速率常数 .实验中还发现以Fenton反应过程中产生的铁离子的复合物代替Fe2 +作为催化剂时Fenton反应不仅取得了较高的催化反应速率和降解效率 ,而且对硝基苯具有明显的专属性 ,硝基苯的降解速率可由原来的 1 7 4 8mg/(L·min)提高到 71 2 2mg/(L·min) ,反应 5min的硝基苯去除率由 9 74 %提高到 91 79% .用人造沸石为载体吸附该物质制成的非均相催化剂同样具有良好的催化性能 .另外 ,在体系中引入紫外光可以促进废水中CODCr的进一步降解 。

Fenton试剂的氧化作用机理及其应用

探讨了Fenton试剂(包括标准Fenton试剂、改性Fenton试剂、光—Fenton试剂、电—Fenton试剂及配体—Fenton试剂)降解有机物的作用机理,同时总结了Fenton试剂在水处理中的应用。

Fenton法的氧化机理及在废水处理中的应用进展

阐述了普通Fenton法、光-Fenton法和电-Fenton法的原理及应用,并对各种类型的Fenton法的优势、问题及发展趋势作了评述,尤其介绍了它和其它技术(生物法、混凝法、吸附法)联用的优势及应用情况。

Fenton氧化／混凝法后续处理垃圾渗滤液研究

六里屯垃圾填埋场的垃圾渗滤液经UASB+A/O系统处理后,COD和氨氮含量分别在1350～1500和280～420mg/L,还需要进一步处理。因此采用Fenton氧化/混凝法作为后续处理工艺,考察了不同条件下对污染物的去除效果。结果表明,当pH=7、[Fe2+]=0.0167mol/L、[H2O2]=0.05mol/L、[FeCl3]=600mg/L、[AP410C]=4mg/L时,该工艺对浊度、COD和氨氮的去除率分别为82%、80.7%、55.9%,去除效果较好。

超声波促进Fenton法脱色甲基橙溶液的研究

分别研究了超声波、Fenton试剂、超声波-Fenton试剂作用下甲基橙溶液的脱色和COD去除行为.结果表明,超声波单独作用甲基橙溶液几乎没有脱色效果;Fenton试剂单独作用400mg/L的甲基橙溶液30min,甲基橙色度去除率67.51%,COD去除率63.15%;而超声波-Fenton试剂时,溶液色度去除率86.91%,COD去除率80.32%.超声波与Fenton试剂对甲基橙溶液的脱色和COD去除有协同作用.Fenton试剂脱色强酸性甲基橙溶液是氧化反应,而在pH大于5时,是还原反应.

Fenton试剂与染料溶液的反应

Ｆｅｎｔｏｎ试剂与酸性、活性、直接、阳离子、分散和还原６类１８种染料反应时，前４类染料在１８０ｍｉｎ内完全脱色，ＴＯＣ浓度均显著下降．后２类染料的脱色率很低，ＴＯＣ浓度降低不多．研究了不同金属离子与紫外光的催化下，Ｈ２Ｏ２对染料罗丹明Ｂ溶液的氧化反应．催化的结果为：Ｆｅ２＋／ＵＶ＞Ｃｕ２＋／ＵＶ＞Ｆｅ２＋＞Ｃｕ２＋＞Ｍｎ２＋／ＵＶ＞Ａｇ＋／ＵＶ＞Ｍｎ２＋＞Ａｇ＋．通过与还原蓝ＲＳＮ溶液的反应，表明Ｆｅｎｔｏｎ／ＵＶ体系中的反应程度大于Ｆｅｎｔｏｎ及Ｈ２Ｏ２／ＵＶ２种体系中反应程度的加和。

光催化与Fenton试剂对硝基苯酚降解的研究

文章对光催化/Fenton试剂联合降解硝基苯酚模拟废水进行了研究。探讨了硝基苯酚溶液的初始浓度、pH、亚铁离子浓度、双氧水浓度、催化剂量等对对硝基苯酚降解效果影响。结果表明,对于200mL,浓度为100mg/L的硝基苯酚溶液,当加入Fe2+为20mg/L,5mmol/LH2O2,催化剂TiO2为0.6g/L,紫外灯功率为250W且反应40min后,对硝基苯酚的降解率达到约100%。通过对比试验,发现光催化和Fenton试剂对对硝基苯酚的降解起协同作用,并通过GC/MS技术测定中间产物并给出了可能的降解途径。

Fenton试剂对垃圾渗滤液中有机物的去除特性研究

采用Fenton试剂处理垃圾渗滤液,在最佳试验条件下,考察了Fenton试剂对渗滤液中不同表观分子质量和不同种类有机物的去除效果。结果表明,Fenton试剂对表观分子质量>2ku的COD和表观分子质量>4ku的UV254的去除效果较好,去除率分别大于60%和80%。Fenton试剂对富里酸(FA)的去除率为85%,对腐殖酸(HA)的去除率为68.4%,对亲水性有机物(HyI)的去除率为36.5%。

微电解--Fenton联合工艺处理硝基苯废水效能研究

利用微电解-Fenton联合工艺处理硝基苯废水。进行了工艺参数条件的优化,分析了影响处理效果的原因,并在优化的参数条件下对比联合工艺与其单独处理工艺的除污染效果。结果表明,微电解-Fenton联合工艺出水硝基苯去除率达99.9%,COD去除率为69.2%。在同样参数条件下单独微电解工艺硝基苯去除率为89.7%,COD去除率为42.3%,均远远低于联合工艺,而单独Fenton工艺硝基苯去除率为99.7%,COD去除率仅为30.4%,还不及联合工艺的一半。说明联合工艺经济、高效,具有很大优势。

铁炭耦合Fenton试剂-混凝沉淀法预处理DMAC废水

N,N-二甲基乙酰胺(DMAC)危害大,是化纤废水中的主要污染物之一.采用铁炭微电解-Fenton试剂-混凝沉淀工艺预处理DMAC废水.结果表明:在海绵铁投加量为30g/L,铁炭体积比为1,pH为2,微电解反应1h,H2O2投加量为5mL/L,pH为3,Fenton试剂反应2.0h,混凝沉淀pH为9.0,沉淀40min的最佳工艺条件下,CODCr的去除率可稳定在70%以上;紫外可见分光光计测定证明,经微电解反应后DMAC的助色基团—CH3和CO被破坏,经过Fenton氧化后,—NH—基团才能被破坏,废水中的大分子物质被破坏,最终转变成小分子物质,为后续处理奠定了基础.