聚铁混凝-Fenton-BAF组合工艺处理垃圾渗滤液RO浓水

发布时间：2018-07-03 20:45

  本文选题：垃圾渗滤液RO浓水 + 混凝　； 参考：《华南理工大学》2015年硕士论文

【摘要】：随着我国废水排放标准的不断提高,可以稳定获得高出水水质的反渗透(RO)工艺越来越多的被应用到垃圾渗滤液处理实际工程中。但与此同时产生的RO浓水是一类高有机物浓度、高色度、高盐度且可生化性极差的有机废水,已成为制约膜应用的主要技术难题。因此研究开发一套高效经济,实用可行的垃圾渗滤液RO浓水处理工艺势在必行。本研究以广州市李坑垃圾焚烧渗滤液RO浓水为研究对象,采用聚合硫酸铁(PFS)混凝-Fenton-曝气生物滤池(BAF)组合工艺对其进行深度处理,并完成12 m3/d的中试应用研究。混凝小试试验结果表明,PFS、聚合氯化铝(PAC)和三氯化铁(FC)三种絮凝剂均能有效去除RO浓水化学需氧量(COD)和色度,但PFS去除效果明显优于其他两种混凝剂,且在反应初始p H值为5.5,投加量为1000 mg/L获得最佳去除效果,此时RO浓水的COD和色度去除率分别为57.1%和80.5%。聚铁混凝后出水进行Fenton-BAF深度处理。Fenton氧化工艺的最佳试验条件为:起始p H为3.92(混凝出水p H值),H2O2=80 mmol/L,n H2O2:n Fe2+=2,反应时间60 min,分次投药比为4:1,出水COD和色度的去除率分别为51%和92%,BOD5/COD由0.01提高至0.32。Fenton氧化出水进入气水比为4:1~6:1,停留时间为10~12 h的BAF,连续运行10d后最终出水COD可稳定低于300 mg/L,色度低于40倍。本研究对组合工艺各阶段出水进行紫外-可见光谱(UV-vis)和三维荧光光谱(EEM)分析。RO浓水经组合工艺处理后E253/E203比值由0.497降至0.0313,说明有机物取代基经处理后逐渐转变为以脂肪链为主。不同处理阶段RO浓水可溶性难降解有机污染物(DOM)三维荧光光谱显示,随处理过程的进行,类富里酸和类腐殖酸的含量逐渐下降,有机物的芳构化程度普遍降低。中试运行结果表明,在RO浓水日处理量12 m3/d,聚铁投量1 kg/m3,双氧水(27.5%)投量7.8~8 L/m3,n(H2O2)n(Fe2+)=2,BAF水力停留时间(HRT)12小时的条件下,出水COD≤300 mg/L,色度≤60倍,NH3-N≤10 mg/L。出水水质满足并优于《水污染物排放限值》(DB44/26-2001)第二时段三级标准和《污水排入城市下水道水质表》(CJ3082-1999三级标准)。炉渣化学组成通过能谱分析(EDS)和X射线荧光光谱(XRF)分析,结果表明组合工艺出水可回用于炉渣冷却。
[Abstract]:With the continuous improvement of wastewater discharge standards in China, reverse osmosis (RO) process, which can obtain high effluent quality stably, is more and more used in landfill leachate treatment projects. However, the RO concentrated water produced at the same time is a kind of organic wastewater with high organic concentration, high chroma, high salinity and poor biodegradability, which has become the main technical problem restricting the application of membrane. Therefore, it is imperative to develop a set of high efficient, economical, practical and feasible RO concentrated water treatment process for landfill leachate. In this study, the RO concentrated water from Likeng landfill incineration leachate in Guangzhou city was treated with polymeric ferric sulfate (PFS) coagulation-Fenton- aerated biological filter (BAF) combined process, and the pilot application of 12 m3 / d was completed. The results of coagulation experiment showed that PFS, PAC and FC could effectively remove COD and chroma of RO concentrated water, but the removal effect of PFS was better than the other two coagulants. When the initial pH value of the reaction was 5.5 and the dosage was 1000 mg / L, the removal rates of COD and chromaticity of RO concentrated water were 57.1% and 80.5%, respectively. The optimum conditions of Fenton-BAF advanced treatment. The COD of BOD 5 / 5 was increased from 0.01 to 0.32.Fenton oxidation effluent, the ratio of air to water was 4: 1: 6: 1, and the residence time was 10 ~ 12 h. After 10 days of continuous operation, the COD of the final effluent was stable below 300 mg / L, and the chroma was less than 40 times. UV-vis and three dimensional fluorescence spectra (EEM) were used to analyze the effluent from each stage of the combined process. The E253 / E203 ratio of the concentrated water was reduced from 0.497 to 0.0313, which indicated that the organic substituent was gradually converted to fat chain after treatment. Three-dimensional fluorescence spectra of soluble refractory organic pollutants (Dom) in RO concentrated water showed that the contents of fulvic acid and humic acid decreased gradually and the degree of aromatization of organic matter decreased with the process of treatment. The results showed that under the conditions of 12 m3 / d of RO concentration per day, 1 kg / m ~ (3) of polyiron, 7.8 L / m ~ (-3) H _ 2O _ 2 (H _ 2O _ 2) n (Fe _ 2) and 12 hours HRT, the effluent COD 鈮，

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