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。     

拉米夫定生产废水预处理工艺研究

拉米夫定生产废水为高盐、高有机污染物废水,治理难度较大。研究了采用Fenton法和电絮凝法预处理该类废水。结果表明:电絮凝法比Fenton法的处理效果更好;在pH=6.1、电流密度20mA/cm2、反应时间1h条件下,电絮凝法的CODCr去除率达35%以上,处理成本仅3.63元/t废水;预处理后的废水再经生化反应处理,出水CODCr稳定在400mg/L左右,处理效果较为理想。     

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。     

贵州某金矿氰化废液中SCN~-去除试验研究

贵州某金矿选厂废水中含有较高的硫氰酸根,远超出了国家的排放标准。采用Fenton法对其进行实验室小型试验研究,利用自行组装的试验装置对该选厂废水进行条件试验研究,最终得到了最优的试验参数。在p H=1.8,Fenton试剂用量为16 m L/L,气液比≥300∶1,温度≥40℃,反应吹脱时间≥4 h的条件下,有效地去除了废水中硫氰酸根,达到硫氰酸根排放标准,并使其以氰化钠的形式得以回收。     

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。     

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。     

焦化厂蒸氨废水处理新技术

根据新环保法实施后钢铁企业焦化蒸氨废水治理方面亟待解决的环保现状,针对目前正在研究的Fenton氧化法和HSB微生物技术进行试验,介绍了试验方法,对试验后的水质化验结果得出试验性结论,提出了治理蒸氨废水的方向。     

离子型稀土矿山氨氮废水处理方法探索性中试研究

采用生化法处理氨氮废水,研究pH值对预处理的影响以及温度、不同碳源对生化处理的影响。结果表明,预处理能去除废水中的大部分稀土和金属离子;温度高于20℃,生化处理效果明显提高;碳源投加配比的不同对氨氮去除的效果影响不大。     

臭氧催化氧化深度处理生化出水中试研究

开展了规模为1 ～2 m3/h的“混凝＋臭氧催化氧化”工艺处理生化出水中试试验,通过试验考察了“混凝＋臭氧催化氧化”工艺连续深度处理焦化废水的效果、生化出水水质变化对废水深度处理系统的冲击和运行成本,为下一步焦化废水深度处理工艺的选择提供了参考.     

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.     

超声波处理焦化废水影响因素

利用超声波处理焦化废水,系统考察了作用时间、超声功率、焦化废水初始pH值、化学需氧量(COD_Cr)和氨氮(NH₄⁺N)初始质量浓度、溶解气体等因素对去除废水中COD_Cr和NH₄⁺-N的影响,并对超声复合氧化剂处理焦化废水进行了对比分析.结果表明,超声复合H₂O₂和Fenton试剂可发生协同作用,使COD_Cr和NH₄⁺N去除率显著提高,其去除率由大到小依次为:超声+Fenton>超声+H₂O₂>Fenton>超声>H₂O₂.结合GC-MS分析结果,对COD_Cr和NH₄⁺N的去除过程进行了初步探讨.发现处理后的焦化废水中萘类、蒽类和喹啉类等生物降解难的有机物的比例明显降低.     

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。     

Dosage Control of the Fenton Process for Color Removal of Textile Wastewater Applying ORP Monitoring and Artificial Neural Networks

Textile wastewater containing a high level of color and refractory chemical oxidation demand (COD) is difficult to treat using traditional wastewater treatment processes. Typically, a chemical process was suggested as a pretreatment to remove color and increase biodegradability of refractory organic materials. A biological process was then used to remove organic materials and reduce chemical costs for textile wastewater treatment. Fenton oxidation is one of the most effective chemical processes for removing color and COD for textile wastewater. In Fenton processes, oxidations by generated hydroxyl radical are the key factor for color removal in textile wastewaters; thus, monitoring oxidation reduction potential (ORP) should have high potential in Fenton dosage control for color removal in textile wastewater treatment. The main object of this study is to build a Fenton dosage control strategy that uses ORP monitoring and artificial neural network (ANN) models for removing color from textile wastewaters. Two wastewaters, synthetic and real textile, were used in this study. Experimental results have shown that the ANN models precisely represent the correlation between monitoring ORP, Fenton doses, color removal efficiency, and effluent color value, and therefore can be used to control Fenton doses for removing color from textile wastewater. Finally, another series of Fenton dose-control experiments for different color removal control targets were conducted to evaluate this proposed Fenton dose control strategy. Experimental results indicate that the proposed control strategy precisely controls the required Fenton doses for different control targets for both synthetic and real textile wastewaters, and result in reduced chemical costs.     

Evaluation of Water Reuse Technologies for the Textile Industry

Treatment technologies were evaluated for application in water reuse for the textile industry. Technologies tested included electrochemical oxidation, hypochlorite oxidation, ozonation, granular activated carbon (GAC) adsorption, bisulfite catalyzed sodium borohydride reduction, Fenton’s reagent, coagulation, and anaerobic biodegradation. Bench-scale side-by-side tests were conducted using a spent dyebath wastewater from a jigg dyeing operation. The dyebath contained three reactive dyes and auxiliary chemicals (e.g., common salt, soda ash, acetic acid, and caustic). Each technology was evaluated for its effectiveness at removing color and chemical oxygen demand (COD) and anticipated operating costs. Ozone, GAC, and electrochemical oxidation produced high-quality effluent, suitable for reuse. Although hypochlorite oxidation and sodium borohydride reduction resulted in significant color removal, it was not sufficient to meet reuse criteria. Results were either insignificant or inconclusive for coagulation, Fenton’s reagent, and anaerobic biodegradation. Auxiliary chemicals had great impact on the performance of many of the alternatives evaluated.     

金属催化剂对Fenton试剂活性的影响因素分析

在分析Fenton氧化法作用机理的基础上,研究了金属催化剂Fe~(2+)/Fe~(3+)对Fenton试剂活性的影响。结果表明:Fe~(2+)和Fe~(3+)对Fenton试剂活性均具有催化作用,Fe~(2+)催化作用远大于Fe~(3+)催化作用;在H_2O_2投加量为12 mmol/L,反应温度为25℃,反应时间为25 min条件下,[Fe~(2+)]/[H_2O_2]的物质的量比为1∶10时,焦化含酚废水COD去除率最高达到90.2%(质量分数);在光照特别是紫外线协同作用下,Fe~(2+)和Fe~(3+)活性增大,且Fe~(3+)的活性增强趋势明显高于Fe~(2+)。     

Treatment of Drilling Wastewater by Combined Coagulation-Ultraviolet/Fenton-Pressurized Biological Processes

An integrated technique containing coagulation, ultraviolet/Fenton oxidation, and pressurized biological processes was provided for the treatment of wastewater generated from drilling operation where sulfonated muds were used. Ultraviolet/Fenton oxidation process was used to improve biodegradability of effluent after coagulation [assessed through a ratio of biological oxygen demand to chemical oxygen demand (COD) (B/C) index]. Pressurized biological experiments were used to further remove COD so as to meet the wastewater discharge standard. The results showed that coagulation pretreatment could help remove most of CODs (70–80%) in drilling wastewater. A 57% reduction in COD was obtained in the ultraviolet/Fenton oxidation process with 0.8 Qth H2O2 (in 30 min), and the biodegradability was significantly improved (B/C was increased from 0.03 to 0.47). The pressurized biological process could help speed up the reaction process with a saved aeration time of 66.7% under a system pressure of 0.2 MPa (in comparison with the condition of a normal pressure). The overall COD removal efficiency was about 95% and the COD level in the final effluent was less than 100 mg/L, which satisfied the wastewater discharge standard.     

Rotating-Perforated-Tubes Biofilm Reactor for High-Strength Wastewater Treatment

A rotating-perforated-tubes biofilm reactor was used for treatment of synthetic wastewater at different operating conditions. The biofilm reactor consisted of two sections each having 25 perforated tubes mounted on three perforated discs. The battery of the tubes was rotated with the aid of a shaft and a motor. Effects of major process variables such as feed wastewater flow rate and COD concentration on the system performance were investigated. Kinetics of COD removal was investigated and kinetic constants determined by using the experimental data. An empirical design equation was developed to quantify the system's performance as a function of major process variables.     

Liquid Sodium Ferrate and Fenton’s Reagent for Treatment of Mature Landfill Leachate

As landfills mature, biodegradable matter in leachate is consumed and remaining compounds are increasingly recalcitrant. In this work, ferrate was compared to Fenton’s reagent for the purpose of removing nonbiodegradable organic compounds from mature leachate. Oxidation conditions (time, pH, and dose) were optimized to yield maximum organic removal using two leachate samples from 20- and 12-year-old solid waste cells. Results from this study demonstrated that Ferrate and Fenton’s reagent had similar optimum pH ranges (3–5), but different organic removal capacities, ranging from 54 to 79% of initial leachate organic contents. An advantage of ferrate was that it was effective over a wide pH range. Advantages associated with Fenton’s reagent include that it had higher organic removal capacity, produced more oxidized organic compounds (measured as chemical oxygen demand/dissolved organic carbon), and produced more biodegradable byproducts (measured as chemical oxygen demand/5-day biochemical oxygen demand). Finally, both treatments were found to attack larger molecules (>1,000?Dalton), as indicated by an increase in smaller molecule contribution to organic carbon.     

水杨基荧光酮荧光法测定羟自由基的探讨

建立了一种新的测定Fenton反应所产生的羟自由基的方法,经过条件的研究,得出最佳实验条件,同时,通过清除率实验反证了该方法的可靠性,利用顺磁共振法测定SAF加入前后的波谱变化来进一步证实该方法的正确性,化学测定过程均在国产仪器下完成。     

萃取皂化废水除COD制工业盐工艺研究

研究了皂化废水中含油量、COD浓度对皂化废水结晶盐的品质影响和Fenton氧化法降解COD工艺。结果表明,经活性炭除油后,含油量小于5 mg/L;在摩尔比n(H2O2)/n(Fe2+)=8、反应pH=3.0、双氧水浓度0.472 mmol/L、反应时间60 min的条件下,COD浓度小于217 mg/L。经上述工艺处理后的皂化水用氢氧化钠沉淀除铁,蒸发结晶可以得到白度为87.52、氯化钠纯度为95.7%、达到一级标准的工业级氯化钠盐。