改性Fenton试剂处理模拟苯酚废水研究

目的提高废水中苯酚的去除率。方法分别采用普通Fenton试剂和改性Fenton试剂(纳米Fe3O4/H2O2体系)处理模拟苯酚废水,找出其最佳反应条件,并将两者的处理效果进行对比。结果采用改性Fenton试剂处理苯酚废水,在pH=3时,按照m(COD)∶m(H2O2)=1∶3,n(Fen+)∶n(H2O2)=1∶5投加一定量的纳米Fe3O4和H2O2,搅拌反应60 min,化学需氧量(COD)去除率达到(91.80±1.64)%,而相同条件下普通Fenton试剂的COD去除率为(81.31±1.83)%。结论改性Fenton试剂的处理效果优于普通Fenton试剂的处理效果。     

紫外线强化Fenton试剂法处理苯酚废水的试验研究

采用紫外线强化Fenton试剂法,以苯酚废水为对象,探究了紫外线和药剂投加量对处理效果的影响。结果表明:对于COD为470 mg/L的苯酚原水,在H_2O_2投加量为2倍理论投加量,FeSO_4·7H_2O投加量为1. 25 mg/L,pH值为3的条件下,反应60 min后COD去除率为83. 37%。紫外线对Fenton试剂法有强化作用,在提高去除效果的同时减少药剂的投加量,降低成本。     

Fenton试剂处理染料废水的研究

本实验采用Fenton高级氧化法处理染料废水的深度处理研究,研究了Fenton试剂对此废水的处理效果及影响因素.结果表明Fenton试剂可以有效的去除此废水中的COD。通过各因素试验确定最优反应条件为：H2O2 /Fe2+为0.9（物质的量之比）,Fe2+投加量为0.8g/L,pH为3。 在此条件下CODcr去除率为85%。     

混凝预处理Fenton法处理PVA废水的试验研究

采用混凝预处理Fenton氧化法处理聚乙烯醇(PVA)模拟废水,并探究p H值、H_2O_2投加量、FeSO_4·7H_2O投加量、H_2O_2投加次数及反应时间对PVA及COD处理率的影响。试验表明:在一定程度上提高反应时间、H_2O_2投加次数可以提高PVA及COD的去除率;同时确定反应的最佳p H值为3左右;H_2O_2/COD最佳投加量为3左右,后确定Fe SO_2·7H_2O投投加量为40g/L最佳。通过正交试验分析,以pH值、H_2O_2投加量、FeSO_4·7H_2O投加量、反应时间为主要因素建立4因素3水平的正交试验。分析结果表明,反应时间对去除率的影响最大。     

实用型光催化氧化水处理器深度处理焦化废水

解决光催化剂与废水的即时分离问题是光催化氧化技术走向实际的关键之一。采用新型的实用型光催化水处理器——连续流即时分离型光催化反应器深度处理焦化废水,发现在适宜的反应时间、TiO2投加量、光辐照强度和初始pH值下是完全可行的。然后在此基础上选用H2O2和Fenton试剂为外加氧化剂,研究了氧化剂强化光催化深度处理焦化废水的效果。结果表明,在UV/TiO2氧化体系中投加H2O2或Fenton氧化剂,可显著提高光催化氧化对COD和色度的去除率;在最佳反应条件下,不同氧化体系对焦化废水的深度处理效果排序为:UV/TiO2/Fenton>UV/TiO2/H2O2>UV/TiO2。     

Fenton试剂氧化法深度处理焦化废水的研究

以实际焦化废水经A2O工艺处理后的出水为研究对象,考察了Fenton试剂氧化法深度处理焦化废水的效果和影响因素。结果表明,Fenton试剂氧化法对焦化废水具有良好的深度处理效果,在进水COD为100～340mg/L、色度为480～940倍的条件下,出水COD和色度等指标均可达到《城市污水再生利用工业用水水质》(GB/T19923—2005)的要求。在试验条件下,最佳的反应参数:初始pH值为2.5,反应温度为40～50℃,Fe2+投加量为0.4mmol/L,反应时间为2～3h,H2O2投加量为4～8mmol/L。     

Fenton氧化法预处理巯基丙酸废水

采用Fenton氧化法预处理巯基丙酸废水,研究了初始p H,H2O2投加量、反应时间、投加次数对Fenton试剂处理巯基丙酸废水的影响,结果表明,Fenton氧化法对巯基丙酸废水有较好的预处理效果,为相关企业提供污水治理工艺的技术依据。     

应用于垃圾渗滤液预处理工艺的研究

针对垃圾渗滤液高COD、高氨氮的特征,选用了混凝沉淀、Fenton氧化、蒸发及其组合工艺对垃圾渗滤液进行预处理,通过单因素试验,探讨了各工艺的最佳运行条件。试验结果表明,采用混凝沉淀法时,PAFC最佳投加量为30 mg/L,PAM最佳投加量为4 mg/L;采用Fenton氧化法时,H2O2最佳投加量为1.5‰,H2O2∶Fe2+最佳质量比为10∶3;垃圾渗滤液的最佳预处理工艺为混凝沉淀+Fenton氧化+蒸发,此时COD,NH4-N+的去除率分别为91.22%,86.73%,为后续生化处理提供了良好的反应条件。     

微电解-电Fenton法处理乳化液中段废水

为探索有效预处理高浓度乳化液废水的方法,分别对微电解法、电Fenton法预处理乳化液中段废水进行单因素试验和正交试验研究,分析影响COD降解的各个因素,并对微电解-电Fenton法处理乳化液中段废水进行稳定性测试。结果表明:微电解反应的最佳条件为初始pH为3,Fe与C质量比为1∶1,反应时间为90min;电Fenton反应的最佳条件为pH为2,电流密度为40mA·cm-2,每L废水中H2O2投加量为50mL,反应时间为180min。采用微电解-电Fenton法处理乳化液中段废水,COD去除率最高可达80%以上,BOD5/COD可由0.24提升至0.78,可生化性提高,适合后续进行生化处理。     

芬顿氧化法预处理餐饮废水的试验研究

进行了Fenton试剂预处理餐饮废水的试验研究，确定了最佳反应条件：pH值为3左右，反应温度为30℃，H2O2投加量为0．024—0．028mol/L，H2O2与Fe^2＋的浓度比为1．8左右。在此条件下处理COD浓度为3615mg／L、动植物油含量为746mg／L的实际餐饮废水，对COD的去除率为81．1％，对动植物油的去除率为87．4％，处理效果良好。     

泡沫分离—Fenton氧化处理炼油废水

针对炼油厂废水处理工程,分析了表面活性剂成分及运行中产生泡沫的原因。采用泡沫分离—Fenton氧化技术进行处理,实践证明其出水水质优于国家排放标准,解决了废水排放过程中产生泡沫的问题。     

纺锤芽孢杆菌降解水中萘的特性研究

从处理石油废水的曝气池污泥中筛选、分离到一株能有效降解萘的菌株,经鉴定为纺锤芽孢杆菌(BFN),研究了其对水中萘的降解特性。结果表明:在温度为30℃、自然pH(6.68～6.76)、接种量为0.2%、(NH4)2SO4浓度为0.15g/L的最适降解条件下,BFN对萘(初始浓度为50mg/L)的降解率在96h内达到99.8%;BFN还具有较好的耐盐度,对高浓度的萘也有较好的耐受性。BFN对萘的降解过程符合一级反应动力学。通过检测不同底物水样的吸光度、pH和底物浓度的变化,发现BFN还能降解苯甲酸、水杨酸、邻苯二甲酸、甲苯、苯酚以及1-萘酚。     

Fenton试剂强化铁炭微电解预处理高浓有机废水

研究了Fenton试剂法强化铁炭微电解工艺对高浓度难生化有机废水的预处理效果。结果表明，当原水COD在9000mg／L、铁炭微电解反应时间为100min、pH值为2．2时，铁炭微电解对原水COD的去除率〉45％；铁炭微电解出水再投加240mg／L的H2O2（30％）进行Fenton试剂法处理，常温下反应50min对原水COD的去除率可提高到75％以上。铁炭微电解＋Fenton试剂联合工艺的除污效果好、运行稳定、成本低廉，适宜对高浓度难生化有机废水的预处理。     

Fenton法在焦化废水处理中的应用及研究进展

介绍了Fenton氧化法及其各种联合技术在焦化废水处理中的应用及研究进展,分析了各种因素对Fenton氧化法处理效果的影响,并对Fenton氧化法在焦化废水处理中的发展前景作了展望.     

Electro‐oxidation of phenol in petroleum wastewater using a novel pilot‐scale electrochemical cell with graphite and stainless‐steel electrodes

This work investigated the removal of phenol from petroleum wastewater by the electro‐oxidation process. The experimental design was developed on a pilot‐scale electro‐oxidation system equipped with a cylindrical shape of graphite electrodes as an anode and stainless‐steel electrodes as a cathode. An initial study was performed based on operating variables such as current density and time on real petroleum wastewater. The optimum conditions were obtained as a current density of 3 mA/cm² and time 15 min. Under these applied optimum conditions, complete phenol removal from an initial concentration of about 6.8 mg/L was achieved. Also, 50–60% removal of organic matter in terms of chemical oxygen demand (COD) and biological oxygen demand (BOD). The removal of organic matter using electro‐oxidation requires a long reaction time. Also, the economic study indicated that the energy consumption was determined to be 0.79 kWh/m³ and the operating cost was 0.051 $/m³ which is very economical compared with conventional methods.     

铁炭Fenton/SBR法处理硝基苯制药废水

为探寻硝基苯废水的适宜处理工艺，开展了铁炭Fentort／SBR工艺处理硝基苯制药废水的试验研究。结果表明，铁炭内电解结合Fenton氧化的预处理工艺可有效去除废水中的硝基苯类物质，并提高了废水的可生化性。当原水的pH值为2～3、H2O2投加量为500～600mg／L时，调节预处理出水pH值至7～8并经沉淀处理后，对COD和硝基苯类物质的总去除率分别可达47％和92％。后续混合废水经SBR工艺处理后出水水质能满足国家污水排放标准。     

Anodic Fenton process assisted by a microbial fuel cell for enhanced degradation of organic pollutants

The electro-Fenton process is efficient for degradation of organic pollutants, but it suffers from the high operating costs due to the need of power investment. Here, a new anodic Fenton system is developed for energy-saving and efficient treatment of organic pollutants by incorporating microbial fuel cell (MFC) into an anodic Fenton process. This system is composed of an anodic Fenton reactor and a two-chamber air-cathode MFC. The power generated from a two-chamber MFC is used to drive the anodic Fenton process for Acid Orange 7 (AO7) degradation through accelerating in situ generation of Fe²⁺ from sacrificial iron. The kinetic results show that the MFC-assisted anodic Fenton process system had a significantly higher pseudo-first-order rate constant than those for the chemical Fenton methods. The electrochemical analysis reveals that AO7 did not hinder the corrosion of iron. The anodic Fenton process was influenced by the MFC performance. It was also found that increasing dissolved oxygen in the cathode improved the MFC power density, which in turn enhanced the AO7 degradation rate. These clearly demonstrate that the anodic Fenton process could be integrated with MFC to develop a self-sustained system for cost-effective and energy-saving electrochemical wastewater treatment.     

厌氧/好氧/生物脱氨工艺处理煤化工废水

采用厌氧/好氧/生物脱氨/混凝沉淀工艺处理煤化工废水,设计总处理量为360m3/h。4个多月的调试运行结果表明,该工艺运行稳定,耐冲击负荷能力强,当进水平均COD为2 141 mg/L、总酚为391 mg/L、氨氮为92 mg/L时,处理后出水COD100 mg/L、总酚10 mg/L、氨氮15 mg/L,出水水质达到《污水综合排放标准》(GB 8978—1996)的一级标准。     

Sulfide removal in wastewater from petrochemical industries by autotrophic denitrification

An alternative flowchart for the biological removal of hydrogen sulfide from oil-refining wastewater is presented; autotrophic denitrification in a multi-stage treatment plant was utilized. A pilot-scale plant was fed with a mixture of the following constituents: (a) original wastewater from an oil refining industry (b), the effluent of the existing nitrification-stage treatment plant and (c) sulfide in the form of Na2S. Anoxic sulfide to sulfate oxidation, with nitrate as a terminal electron acceptor, proved very successful, as incoming concentrations of 110 mg S2-/L were totally converted to SO(4)2-. At complete denitrification, the concentration of S2- in the reactor effluent was less than 0.1mg/L. Fluctuating S2- concentration in the feed could be tolerated without any problems, as the accumulated sulfide in the effluent of the denitrification stage is oxidized aerobically in a subsequent activated-sludge treatment stage. This alternative new treatment scheme was further introduced at the refinery's wastewater processing plant. Thus, complete H2S removal is now accomplished by the combination of the proposed biological method and the existing stripping with CO2. As a result, stripping, and thus its cost, is reduced by 70%.