污水处理中氨氮吸附剂的类型及经济性比较分析

介绍了目前国内外对污水中氨氮吸附效果较好的几种吸附剂,论述了这些吸附剂的基本结构、对氨氮的吸附机理、性能特点、改性方法、研究现状、在我国的分布情况以及氨氮吸附剂联用的应用现状。以阜新地区丰富的沸石、粉煤灰和膨润土资源为例,在同等条件下,分析、计算比较了各自吸附氨氮的水处理成本,结果表明沸石比较经济。在实际应用中,要因地制宜选择一种高性价比的氨氮吸附剂。     

沸石吸附法去除垃圾渗滤液中氨氮的研究

为了既有效地解决渗滤液中高浓度NH3-N的问题又降低渗滤液处理的成本 ,探讨了沸石吸附法去除垃圾渗滤液中NH3-N的效果及可行性。小试研究结果表明 :每克沸石具有吸附 15 5mgNH3-N的极限潜力 ,当沸石粒径为 30～ 16目时 ,氨氮去除率达到了 78 5 % ,且在吸附时间、投加量及沸石粒径相同的情况下 ,进水氨氮浓度越大 ,吸附速率越大 ,沸石作为吸附剂去除渗滤液中的氨氮是可行的。     

沸石去除地下水源水中氨氮的试验研究

地下水源水中氨氮的去除有其特殊性,研究利用沸石直接过滤氨氮超标地下水,并对沸石去除氨氮的机理进行了探讨。试验结果表明,滤速和进水氨氮浓度对沸石柱运行效果有很大影响,沸石对低浓度氨氮具有良好的去除作用。在滤速为6m/h,进水氨氮浓度分别为0.8mg/L和1.42mg/L时,以《城市供水水质标准》(CJ/T 206—2005)规定的0.5mg/L为出水水质标准,沸石柱可以分别运行65h和18h。沸石柱对氨氮的去除是吸附和离子交换共同作用的结果。     

沸石吸附水体中氨氮的热力学和动力学过程研究

随着近年来各大自然水体富营养化程度的加重,废水中氨氮的处理显得尤为重要。我国浙江缙云有丰富的沸石矿藏,研究其对于沸石的吸附过程有着明显的应用价值。实验结果显示:在288～318 K范围内的温度对沸石吸附氨氮过程影响较小,在氨氮初始浓度为30 mg/L的条件下,小粒径沸石对氨氮的48 h吸附容量为1.13±0.06 mg/g,去除率为91%。大粒径沸石对氨氮的48 h吸附容量为1.10±0.06 mg/g,去除率为87%。沸石对氨氮的吸附过程遵循二级吸附动力学方程,Freundlich和Langmuir等温吸附方程均适用于描述沸石吸附氨氮的热力学过程。本研究表明天然沸石是一种合适的吸附剂,可用于废水或者天然水体中氨氮的去除。     

无机矿物吸附剂去除矿井水硫酸盐试验研究

为研究环境友好型的酸性矿井水中硫酸盐的去除方法,选用河南某地的天然斜发沸石制备了无机矿物吸附剂,探讨了影响吸附剂吸附去除硫酸盐的因素。结果表明:利用天然沸石制备的无机矿物吸附剂可提高对水体中SO42-的吸附能力;对于500 mg/L的原水,吸附剂用量为15 g/L、吸附液pH=5~7、吸附温度为30℃和吸附时间为2 h时,吸附剂对SO42-的吸附去除率可达到65.2%;吸附SO42-后的吸附剂可采用饱和氯化钠溶液有效再生。     

改性沸石滤料处理屋面雨水的中试试验研究

在前期小试的基础上,进行氯化钠改性沸石滤料处理屋面雨水的中试试验。考察装填氯化钠改性沸石的滤罐及滤料装填方式、进水流速对其去除屋面雨水污染物效果的影响。研究结果表明:改性沸石滤料的最佳装填方式为大粒径沸石在上、小粒径沸石在下,最佳进水流速为6m3/h。该条件下,对实际屋面雨水的氨氮去除率超过80%,COD去除率超过60%,同时出水SS小于10mg/L。经反冲洗后,滤料可重复多次使用,出水水质满足《建筑与小区雨水控制及利用工程技术规范》(GB50400-2016)要求。     

天然沸石对氨氮的吸附作用及其影响因素

通过实验研究天然沸石对氨氮的吸附作用及其影响因素。结果表明,沸石对氨氮的吸附过程遵循准二级动力学模型;沸石对氨氮的等温吸附可用Langmuir和Freundlich等温模型拟合,相关系数R2达到极显著相关(P0.01);随着天然沸石粒径与投加量的减小,沸石对氨氮的吸附量显著增加;在pH值中性时,去除效果最好;温度升高有利于沸石对氨氮的吸附。     

微污染水体中改性泥炭与沸石同步脱氮除磷实验研究

实验研究改性的泥炭与沸石联合作用下同步对微污染水体的脱氮除磷效果,并与单独的改性泥炭除磷和改性沸石脱氮效果进行对比分析,以及通过SEM分析泥炭和沸石改性前后以及联合作用下两种改性材料饱和后的形态特点.实验结果表明,联合作用下改性泥炭吸附水溶液中的磷酸根能力提高,且会释放氨氮,改性沸石吸附水溶液中的氨氮能力下降,改性的泥炭与沸石可同步去除微污染水体的氨氮和磷,出水水质达到国家景观环境用水的再生水指标.     

钠型沸石制备及去氨氮和有机物研究

用NaCl作改性剂对天然沸石进行改性后处理微污染水.以NH3-N和CODMMn去除率为评价指标,通过正交试验,确定适宜的改性沸石制备条件.通过烧杯试验,确定改性沸石处理微污染水的适宜吸附反应条件.试验表明:改性剂NaCl浓度对去除效果的影响最为明显,改性时间次之,固液比影响最小.适宜的制备条件为:NaCl物质的量浓度1.0 mol/L,改性时间24 h,固液比15:100.处理微污染水适宜的反应条件为:水的pH为中性,改性沸石投加量20 g/L,搅拌反应时间30 min.在适宜反应条件下,钠型改性沸石对NH3-N的去除率80.51%,CODMn的去除率43.86%;天然沸石对NH3-N去除率59.97%,CODMn去除率27.5%.改性沸石对氨氮和有机物的去除效果均优于天然沸石.     

基于PHREEQC对载铁沸石去除氮、磷的机理研究

进行室内柱实验并利用地球化学模型PHREEQC模拟天然沸石及改性载铁沸石对水体中氮、磷的去除效果,预测对比天然沸石和载铁沸石去除氮、磷的长期性能。结果表明,在氮磷污染物共存条件下,载铁沸石能够同时且更有效地去除这2类污染物。载铁沸石主要通过离子交换和物理吸附去除氨氮污染物,而对磷酸盐污染物的去除主要通过铁氧化物的水合反应来实现的。模拟结果也表明,不同的pH和覆层材料厚度对载铁沸石去除氮磷的效果有很大的影响。     

改性沸石生物滤池处理中水景观污染水体实验研究

;利用改性沸石良好的吸附性能,设计建立改性沸石生物滤池装置,实验研究改性沸石在中水景观污染水体中脱氮性能,以及形成改性沸石生物膜系统后装置去除污染物的效果,并对污染物去除的机理进行讨论.结果表明,该装置具备良好的去除污染物效果,而且可通过生物作用使改性沸石再生.     

H_2O_2与沸石联用处理污水厂二级出水的研究

为探寻污水厂二级出水深度处理方法,以阜新市某污水处理公司二级出水为研究对象,进行H2O2与沸石联用去除水中COD、氨氮的研究。结果表明：在二氧化锰的催化作用下,pH值为7时,H2O2和沸石的投加量分别为1.5mL和2g,二级出水的COD从138.24mg/L降到52.76mg/L,去除率达到75.36%,NH3-N从20mg/L降到5mg/L,去除率为74.59%,出水有机物和氨氮含量达到国家相关出水标准。     

Performance of a double-layer BAF using zeolite and ceramic as media under ammonium shock load condition简

An experiment was carried out to investigate the anti-ammonium shock load capacity of a biological aerated filter （BAF） composed of a double-layer bed. This bed was made up of a top layer of ceramic and a bottom layer of zeolite. The experiment shows that the anti-ammonium shock load process can be divided into two processes： adsorption and release. In the adsorption process, the total removal efficiency of ammonia nitrogen by zeolite and ceramic was 94%. In the release process, the ammonia nitrogen concentration increased significantly and then gradually returned to the normal level four hours after the shock load. The results indicated that the double-layer BAF had a high level of adaptability to the short-term ammonium shock load and long-term operation. The main factors influencing the dynamic process of ammonia nitrogen adsorption were the filter bed height, ammonia nitrogen concentration of influent, and flow rate. The bed depth service time （BDST） model was used to predict the relationship between the filter bed height and breakthrough time at different flow rates, and the results are reliable.     

李氏禾人工湿地对模拟生活污水的净化修复

人工湿地具有投资少、效果好等优点,得到国内外广泛的关注。从利用李氏禾作为人工湿地植物,沸石和红壤作为人工湿地基质,对人工湿地中氨氮及总磷的去除效果进行研究。采用连续进水的方式,得到结论为人工湿地中氨氮和总磷的去除率在80%左右,采用李氏禾作为人工湿地的植物是可行的,为我国人工湿地治理污染物的研究及实际工程应用提供有价值的理论参考。     

BTX abatement using Chilean natural zeolite: the role of Br?nsted acid sites

In wastewater treatment facilities, air quality is not only affected by conventional unpleasant odour compounds; toxic volatile organic compounds (VOCs) are also found. In this study, the adsorptive capacity of Chilean natural zeolite toward VOC removal was evaluated. Moreover, the influence of zeolite chemical surface properties on VOC elimination was also investigated. Three modified zeolite samples were prepared from a natural Chilean zeolite (53% clinoptilolite, 40% mordenite and 7% quartz). Natural and modified zeolite samples were characterised by nitrogen adsorption at 77 K, elemental analyses and X-ray fluorescence (XRF). Chemical modifications of natural zeolite showed the important role of Br?nsted acid sites on the abatement of VOCs. The presence of humidity has a negative effect on zeolite adsorption capacity. Natural zeolites could be an interesting option for benzene, toluene and xylene vapour emission abatement.     

沸石床复合垂直流人工湿地脱氮机理分析

通过研究沸石床复合垂直流人工湿地中不同形态氮的空间变化,分析了其脱氮机理,认为沸石对NH_3—N的吸附作用是脱氮的重要途径,硝化和反硝化作用提高了TN的去除率,硝化和反硝化强度影响到沸石的饱和周期和生物再生,有待进一步研究。     

Nitrogen removal in maturation ponds: tracer experiments with 15N-labelled ammonia.

A primary maturation pond (M1) was spiked with labelled ammonium chloride (15NH4Cl) to track ammonium transformations associated with algal uptake and subsequent sedimentation. Conventional sampling based on grab samples collected from M1 influent, water column and effluent, and processed for unfiltered and filtered TKN, ammonium, nitrite and nitrate, found low total nitrogen removal (8%) and high ammonium nitrogen removal (90%). Stable isotope analysis of 15N from suspended organic and ammonium nitrogen fractions in M1 effluent revealed that labelled ammonium was mainly found in the organic fraction (69% of the 15N recovered), rather than the inorganic fraction (5%). Algal uptake was the predominant pathway for ammonia removal, even though conditions were favourable for ammonia volatilization (8.9 < pH <10.1 units, 15.2 < temperature <18.8 degrees C). Total nitrogen was removed by ammonia volatilization at 15 g N/ha d (3%), organic nitrogen sedimentation at 105 g N/ha d (20%), and in-pond accumulation due to algal uptake at 377 g N/ha d (71%). Algal uptake of ammonium and subsequent sedimentation and retention in the benthic sludge, after partial ammonification of the algal organic nitrogen, is thus likely to be the dominant mechanism for permanent nitrogen removal in maturation ponds during warm summer months in England.