催化臭氧氧化在己内酰胺废水深度处理中的应用

采用非均相催化臭氧氧化工艺对己内酰胺废水经过厌氧/好氧膜生物反应器工艺生化处理出水进行深度处理,进一步脱色,提高化学耗氧量(COD)去除率;考察了臭氧投加量、催化氧化反应时间对处理效果的影响。结果表明:催化氧化反应时间大于40 min,臭氧投加量为30 mg/L时,COD去除率达到37.4%,脱色效果好,非均相催化臭氧氧化与常规臭氧氧化相比,可节约臭氧量约50%。     

催化臭氧化-曝气生物滤池深度处理柠檬酸废水

针对柠檬酸生产废水二级生化出水色度高、难生化降解的特点,采用催化臭氧化-曝气生物滤池组合工艺对其进行深度处理。结果表明,该组合工艺可实现废水脱色和降解有机物的目的。当催化臭氧化接触氧化时间为30 min,臭氧投加量为22.5 mg/L;BAF气水比为3∶1,水力停留时间为3 h时,出水COD降至60 mg/L以下,色度维持在10~15倍,处理出水达到《城市污水再生利用工业用水水质》(GB/T 19923—2005)的标准。     

臭氧催化氧化对固定床蒸氨脱酚废水COD去除效果研究

为了获得最佳的臭氧催化氧化工艺参数,采用1 t/h臭氧催化氧化装置利用单因素及正交试验法研究了臭氧通气量、臭氧浓度及催化剂投加量对COD去除效果的影响规律,确定了工艺条件的影响主次顺序及最佳工艺参数。最后在最佳工艺参数下进行连续试验80 h,进一步考察了最佳工艺参数下COD的去除效果。结果表明:3种工艺条件(即臭氧浓度、臭氧通气量、催化剂投加量)对COD去除率均有很大影响。通过单因素试验发现,随着臭氧通气量、臭氧、催化剂投加量增加,在同等条件下COD去除率越大,但相应的处理成本会增加,最终选择臭氧通气量为1.5 m3/h≤臭氧通气量≤2.5 m3/h,臭氧浓度为150 mg/L≤臭氧浓度≤250 mg/L,催化剂投加量选择为20 kg/t≤催化剂投加量≤30 kg/t。通过正交试验发现,3种臭氧氧化条件对COD去除率影响的主次顺序为臭氧浓度通气量催化剂投加量,验证了上述单因素试验结果,得到最佳工艺参数为:臭氧通气量2.0 m3/h,臭氧浓度250 mg/L,催化剂投加量30 kg/t。最后采用1 t/h臭氧氧化装置,在最佳工艺参数下对脱酚蒸氨后废水进行连续臭氧氧化试验80 h,COD去除率稳定在43.5%左右,反应后可生化性(B/C)稳定至0.4以上,减轻了后续生化处理的负荷及难度。证明臭氧氧化工艺实际应用效果良好。     

NiO/Al_2O_3催化臭氧化污水厂出水试验研究

采用中试装置,考察了NiO/Al_2O_3催化臭氧技术深度处理城市污水厂出水的可行性。结果表明,NiO/Al_2O_3催化剂加大了臭氧在水中的溶解度,并促进羟基自由基的产生,相同条件下,NiO/Al_2O_3催化臭氧化工艺对COD、DOC、NH_4~+-N、NO_3~--N的去除率分别为50.4%、49.3%、57.6%、35.1%,比单独臭氧工艺分别提高了25.7%、27.5%、46.8%、31.2%。在催化剂投加质量浓度10 g/L,臭氧投加量53.3 mg/min,水力停留时间30 min下,出水COD满足《地表水环境质量标准》(GB 3838—2002)Ⅴ类标准。NiO/Al_2O_3催化剂稳定性良好。     

臭氧催化氧化处理制药废水连续性实验研究

采用NixO-FxO/陶粒催化剂在大高径比的管式反应器中进行臭氧催化氧化连续性实验,研究催化剂投加量、臭氧投加量、反应停留时间、气液接触方式等工艺条件对制药废水的处理效果和稳定性的影响。实验表明,催化氧化连续实验最佳工艺条件为:停留时间90 min,臭氧气体通量为1 L/min,臭氧浓度为96.61 mg/L,臭氧利用率可达到92.8%左右,气液接触方式逆流略优于并流效果。在臭氧催化氧化连续运行96 h,臭氧催化氧化去除制药废水COD可稳定在58%以上。     

臭氧催化氧化处理制药废水连续性实验研究

采用NixO-FxO/陶粒催化剂在大高径比的管式反应器中进行臭氧催化氧化连续性实验,研究催化剂投加量、臭氧投加量、反应停留时间、气液接触方式等工艺条件对制药废水的处理效果和稳定性的影响。实验表明,催化氧化连续实验最佳工艺条件为:停留时间90 min,臭氧气体通量为1 L/min,臭氧浓度为96.61 mg/L,臭氧利用率可达到92.8%左右,气液接触方式逆流略优于并流效果。在臭氧催化氧化连续运行96 h,臭氧催化氧化去除制药废水COD可稳定在58%以上。     

臭氧催化氧化处理炼油生化尾水的研究

针对生化后炼油废水CODCr无法达标的问题,使用负载Mn-Fe氧化物活性相的陶粒催化剂。采用臭氧催化氧化工艺处理炼油生化尾水。研究中考察了pH、温度、催化剂投加量和臭氧用量等工艺条件对生化尾水中CODCr处理效果的影响。结果表明,当废水初始pH=7,臭氧用量为6.3 mg/min,催化剂投加量为8 g/L时,催化氧化效果最优。室温(22℃)下反应30 min后,出水CODCr浓度为48 mg/L,满足了炼油企业排放标准。所制备的催化剂使用后活性稳定,多次使用后活性无明显降低。     

O3催化氧化技术深度处理工业园区印染废水

针对工业园区印染废水的特性,采用O3氧化、O3/H2O2协同氧化、O3催化氧化三组工艺对比,考察反应时间、H2O2投加量、O3投加浓度对印染废水处理效果的影响.结果表明臭氧催化氧化工艺是较合适的处理工艺,反应参数为进水流量1.2 m3/h、回流量2.5 m3/h、臭氧气体流量0.8 m3/h、臭氧投加浓度25 mg/L...     

O_3/Mn~(2+)工艺处理化工园区石化废水二级出水中试研究

采用中试装置研究了O_3/Mn~(2+)工艺处理石化废水二级出水的可行性。试验结果表明,Mn~(2+)的加入提高了臭氧化的效率。当废水pH为5.80,臭氧投加量为84 mg/L,Mn~(2+)投加量为1.5 mg/L,反应时间为20 min时,COD、TOC和色度的去除率分别为42%、36%和99%,比单独臭氧处理分别提高了10%、8%和3%,臭氧消耗量也从单独臭氧化的75 mg/L降低至66 mg/L,经催化臭氧化处理后的废水满足《上海市污水综合排放标准》(DB 31/199—2018)的一级标准。     

臭氧催化氧化处理炼油生化尾水的研究

针对生化后炼油废水CODCr无法达标的问题,使用负载Mn-Fe氧化物活性相的陶粒催化剂。采用臭氧催化氧化工艺处理炼油生化尾水。研究中考察了pH、温度、催化剂投加量和臭氧用量等工艺条件对生化尾水中CODCr处理效果的影响。结果表明,当废水初始pH=7,臭氧用量为6.3 mg/min,催化剂投加量为8 g/L时,催化氧化效果最优。室温(22℃)下反应30 min后,出水CODCr浓度为48 mg/L,满足了炼油企业排放标准。所制备的催化剂使用后活性稳定,多次使用后活性无明显降低。     

臭氧投加量对臭氧-生物活性炭组合工艺影响的研究

为研究臭氧投加量对臭氧-生物活性炭(O3-BAC)组合工艺深度处理再生水效果的影响,在中试系统中考察了随臭氧投加量的变化O3-BAC组合工艺对再生水中常规指标的去除效能.研究结果表明,臭氧反应接触时间为30min,活性炭滤池空床接触时间(BECT)为15min时,当臭氧投加量在1.10mg/L范围内变化,组合工艺对色度...     

臭氧氧化法处理硝基苯废水实验研究

采用臭氧氧化法处理硝基苯溶液,考察了反应时间、硝基苯浓度、溶液pH、臭氧流量等因素对硝基苯降解率的影响。研究结果表明：初始浓度200 mg/L时,pH 9.5、臭氧流量为300 mg/h,经30 min后硝基苯去除率达到95.3%以上。硝基苯降解反应符合一级反应动力学。TOC降解速率低于硝基苯分子降解速率,反应30 min后,TOC去除率比硝基苯去除率低45%左右,表明伴随着硝基苯的分解,由？OH或臭氧和硝基苯分子作用生成一系列中间产物。     

臭氧-活性炭工艺深度处理煤制气废水试验研究

以煤制气废水为研究对象,考察臭氧接触时间和臭氧通量对色度和UV254去除效果的影响,研究了臭氧-活性炭工艺在煤制气废水深度处理中的应用效果及影响因素。结果表明,与臭氧直接氧化相比,臭氧催化氧化对色度和UV254的去除效果显著提高,最佳臭氧接触时间为2 h,最佳臭氧通量为5 L/min,在此试验条件下连续运行该工艺深度处理煤化工废水,进水SS浓度和pH值对处理效果有较大影响,CODCr和色度去除率分别为89.95%和86.50%,出水CODCr的质量浓度小于30 mg/L,色度为30度,远优于GB 8978—1996《污水综合排放标准》中一级标准的要求,达到废水回用相关标准的要求。     

Removal Characteristics of Organic Pollutants in Sewage Treatment by a Pre-Coagulation,Ozonation and Ozone/Hydrogen Peroxide Process

The applicability of a sequential process of ozonation and ozone/hydrogen peroxide process for the removal of soluble organic compounds from a pre-coagulated municipal sewage was examined. 6–25% of initial T-COD_Cr was removed at the early stage of ozonation before the ratio of consumed ozone to removed T-COD_Cr dramatically increased. Until dissolved ozone was detected, 0.3 mgO₃/mgTOC₀ (Initial TOC) of ozone was consumed. When an ozone/hydrogen peroxide process was applied, additional COD_Cr was removed. And we elucidated that two following findings are important for the better performance of ozone/hydrogen peroxide process; those are to remove readily reactive organic compounds with ozone before the application of ozone/hydrogen peroxide process and to avoid the excess addition of hydrogen peroxide. Based on these two findings, we proposed a sequential process of ozonation and multi-stage ozone/hydrogen peroxide process and the appropriate addition of hydrogen peroxide. T-COD_Cr, TOC and ATU-BOD₅ were reduced to less than 7 mg/L, 6 mgC/L and 5 mg/L, respectively after total treatment time of 79 min. Furthermore, we discussed the transformation of organic compounds and the removal of organic compounds. The removal amount of COD_Cr and UV₂₅₄ had good linear relationship until the removal amounts of COD_Cr and UV₂₅₄ were 30 mg/L and 0.11 cm^?1, respectively. Therefore UV₂₅₄ would be useful for an indicator for COD_Cr removal at the beginning of the treatment. The accumulation of carboxylic acids (formic acid, acetic acid and oxalic acid) was observed. The ratio of carbon concentration of carboxylic acids to TOC remaining was getting higher and reached around 0.5 finally. Removal of TOC was observed with the accumulation of carboxylic acids. When unknown organic compounds (organic compounds except for carboxylic acids) were oxidized, 70% was apparently removed as carbon dioxide and 30% was accumulated as carboxylic acids. A portion of biodegradable organic compounds to whole organic compounds was enhanced as shown by the increase ratio of BOD/COD_Cr.     

臭氧氧化处理苯胺废水

采用臭氧氧化法处理苯胺溶液，考察了反应时间、苯胺浓度、溶液pH、臭氧流量等因素对苯胺降解率的影响。研究结果表明：初始浓度200mg／L时，pH值9．0、臭氧流量为300mg／h，经10min后苯胺去除率达到99％以上。苯胺降解反应符合一级反应动力学。TOC降解速率低于苯胺分子降解速率，反应30min后，TOC去除率比苯胺去除率低40％左右，表明伴随着苯胺的分解，生成一系列中间产物。     

Improvement of Biodegradability of Oil Field Drilling Wastewater Using Ozone

The possibility of improving the biodegradability of drilling wastewater using ozone was investigated following coagulation pretreatment. The biodegradability of wastewater was improved significantly following the start of ozonation, and the molecular weight of organic compounds decreased continuously with the progress of oxidation. It is interesting that minimum biochemical oxygen demand, total organic carbon (BOD/TOC) ratio (0.4 g/g) was observed when wastewater was treated with ozone continuously for 15 min. The combination of ozonation for 5 min (ozone consumption ratio of 2.6 g ozone/g TOC) followed by biological degradation produced a total TOC removal rate of 54.3%, which was comparable to direct ozonation for 30 min under the same conditions (TOC removal rate of 54.9%; ozone consumption ratio of 8.7 g ozone/g TOC). It is clear that biological treatment following short-term ozonation was very efficient in TOC removal. A process of successive coagulation-precipitation, ozone oxidation, and biodegradation seemed to be a good option for drilling wastewater treatment.     

BAF-O_3组合工艺深度处理炼化含盐污水工业应用

臭氧催化氧化与曝气生物滤池的联合工艺可用于炼油厂含盐污水的深度处理。惠州炼化分公司采用BAF-O3组合工艺对含盐二级生化出水进行深度处理改造。运行结果表明,在进水COD浓度平均值97.9mg/L,臭氧催化氧化池和臭氧接触氧化塔的臭氧投加量分别为80~90 mg/L、30~20 mg/L的条件下,装置总出水COD浓度均值为43.5 mg/L,满足污水COD≤50 mg/L的限值要求,COD总去除率达到55.57%。BAF单元前置后,其COD去除率提高,COD去除量由2.71 mg/L提高至9.5 mg/L,经分析主要系生物絮凝作用;由于活性炭罐和BAF单元对悬浮物的有效过滤,有利于保护后续的臭氧催化氧化单元。     

臭氧-上向流生物活性炭工艺运行参数的优化

以典型含氮消毒副产物(N-DBPs)——二氯乙腈(DCAN)和二氯乙酰胺(DCAM)前体物的去除为目标,综合考虑浑浊度、CODMn、溶解性有机碳(DOC)、溶解性有机氮(DON)等指标的去除效果.通过调整臭氧投加量、上升流速、反冲洗周期、反冲洗时间4个因素,研究臭氧-上向流生物活性炭(O3-UBAC)工艺对典型N-DB...     

Post-Treatment of Composting Leachate by Ozonation

The post-treatment of composting leachate via an ozonation process in laboratory scale was studied in batch mode. According to the experiments, the COD removal was 47% after 30 min of ozonation via 0.4 g/h ozone (equivalent to 2.8 mg O₃/mg COD removed) at pH 9. In this circumstance, the removal of color and turbidity was also 86% and 89%, respectively. Increasing the ozone mass flow rate higher than 0.4 g/h had no considerable effect on the process variables. However, increasing the reaction time had a significant effect on both the removal of color and on COD of the leachate. Experimental data indicated that complete removal of color and 51% removal of COD were achieved after about 40 min of ozonation via 0.4 g/h ozone (equivalent to 3.3 mg O₃/mg COD removed). The ozone consumption rate increased as the reaction progressed and reached 4.1 mg O₃/mg COD removed after 60 min.     

臭氧氧化与序批式好氧活性污泥法组合工艺的污泥减量化效果

该文研究了臭氧技术应用于剩余污泥处理过程中臭氧利用率及污泥的可生化性随时间的变化,组建了臭氧氧化与序批式好氧活性污泥法结合的联合工艺。将臭氧单元处理过的污泥全部回流至曝气池与污水进行合并处理,考察了不同臭氧投加量下联合工艺中剩余污泥的产量和污水处理效果。结果表明,当处理污泥浓度为4 000 mg/L,污泥体积为3 L,臭氧进气浓度为6.5 mg/L,气量为6 L/min时,前20 min的臭氧利用率几乎为100%,随后利用率逐渐降低;污泥的可生化性先降低,而后逐渐升高,在30 min时达到最大,其后又开始下降;当臭氧投加量为0.078 kg O3/kg MLSS时,联合工艺的污泥增长率几乎为0,同时出水水质相对对照组没有明显变化。