兰炭基活性炭和高分子树脂吸附焦化废水

采用兰炭基活性炭(BAC)和高分子树脂静态吸附焦化废水,研究投加量、树脂种类、pH、吸附时间等因素对COD去除率的影响,探讨BAC吸附过程的吸附等温线和吸附特征。结果表明,在不调节pH条件下,经过7.0 g BAC吸附90 min和1.5 g D301R树脂吸附30 min后,焦化废水COD可降至167 mg/L,去除率达94.14%。Langmuir和Freundlich两种吸附模型对吸附过程都有较好的拟合效果。     

吸附-氧化再生法处理印染废水的试验研究

以印染废水为处理对象,以D301大孔树脂为吸附剂,选取次氯酸钠溶液为再生氧化剂,对吸附-氧化再生法处理印染废水的可行性及其影响因素进行了试验研究。结果表明:D301大孔树脂对印染废水有较好的吸附性能,其COD平衡吸附量可达166.2mg/g;当吸附剂再生时间为20min时,COD再生率可达83.8%。以D301大孔树脂为吸附剂、次氯酸钠溶液为再生氧化剂的吸附-氧化再生法处理印染废水具有处理时间短、操作灵活的优势,吸附剂的氧化再生时间短、再生率高,有很好的可行性和良好的应用前景。     

离子交换法去除磺化泥浆体系钻井废水COD的探索

分别在静态和动态条件下用筛选出的大孔弱碱性离子交换树脂D301R进行了去除磺化泥浆体系钻井废水COD的探索研究。静态试验表明,在适宜的操作条件下,钻井废水的COD去除率可达到90%,出水COD<100mg/L;盐碱混合液(NaCl/NaOH)对树脂的再生效果较好。柱动态吸附和动态洗脱再生试验的结果表明,COD达标(<100mg/L)处理量接近100床层体积,树脂的再生率可以达到81%。     

D301阴离子交换树脂吸附2-酮基-L-古龙酸母液中草酸的研究

研究了分离出2-酮基-L-古龙酸母液中的草酸时,D301阴离子交换树脂在静态和动态情况下吸附草酸的过程,并利用Freundlich吸附等温方程对吸附等温线数据进行拟合。结果表明:D301树脂对草酸的平衡吸附数据符合Freundlich吸附等温方程,在293、303、313K三种温度下相关系数均大于0.99;且在pH值为6、温度313K、流速30mL/min时吸附量达到最大。这些研究为从古龙酸母液中除去或者回收草酸找到了一种有效的方法,并且可降低母液的COD值,从而降低污染。     

2,4-二羟基苯甲酸在3种树脂上的吸附特性

通过静态和动态吸附实验, 研究了717(凝胶型,强碱)、D201(大孔型,强碱)和D301R(大孔型,弱碱)3种阴离子交换树脂对水溶液中2,4-二羟基苯甲酸的吸附特性. 结果表明,717和D201在pH 4~11时、D301R在pH 3~9时吸附能力最好. 在pH=5及温度293~313 K、初始浓度0.6488~6.488 mmol/L条件下,D301R, 717和D201对2,4-二羟基苯甲酸的等温吸附规律均符合Freundlich模型,最大平衡吸附量分别为2.98, 2.66和2.54 mmol/g(吸附未达饱和),均为物理性自发吸附的放热过程. 动力学实验数据用准一级模型方程拟合比准二级更接近实验值. 5%(w) NaCl+2%(w) NaOH脱附液100 mL均可有效洗脱3种树脂上吸附的2,4-二羟基苯甲酸,脱附率达99%. 相同条件下,D301R树脂对2,4-二羟基苯甲酸的吸附性能优于D201和717树脂.     

弱碱性树脂处理β-萘磺酸废水的吸附分离热力学性能

研究了β-萘磺酸废水中β-萘磺酸、H₂SO₄、H₂SO₃ 单组分吸附平衡,并以Langmuir、Freundlich模型对其进行模拟.吸附过程的热力学计算及分析结果表明,吸附过程为放热的化学吸附过程,吸附量顺序为H₂SO₄>NSA>H₂SO₃,推动力大小顺序为H₂SO₄>NSA>H₂SO₃,吸附过程熵增加.以D301R弱碱性树脂为吸附剂,可有效地实现三者的分离.     

2-萘磺酸/硫酸在弱碱性树脂上的吸附平衡研究

Experiments for single and bisolute competitive adsorption were carried out to investigate the adsorption behavior of β-naphthalenesulfonic acid(NSA and sulfuric acid from their solution at 25℃ onto weakly basic resin D301R,Adsorption affinity of sulfuric acid on D301R was found to be much higher than that of NSA.The data of single-solute adsorption were fitted to the Langmuir model and the Freundlich adsorption model.The ideal adsorbed solution theory(IAST) coupled with the single-solute adsorption models were used to predict the bisolute competitive adsorption equilibria.The IAST coupled with the Langmuir and the Freundlich model for sulfuric acid and NSA.Respectively,yields the favorable representation of the bisolute competitive adsorption behavior.     

以弱碱性树脂去除废水中5-氨基-2-氯苯-4-磺酸和盐酸

This research deals with an investigation of the adsorption of two acids, namely, 5-amino- 2-chlorotoluene-4-sulfonic and chlorhydric acids from their solution onto weakly basic resin. The screening of resins, kinetics, and isotherm were studied. The results indicate that the D301R is more appropriate for the removal of acids from solution. The adsorption of acids obeys Langmuir isotherm and the first-order kinetics model. Sorptive affinity of the two acids on D301R was found to be in the order of 5-amino-2-chlorotoluene-4-sulfonic acid〉 chlorhydric acid. Thermodynamic parameters for the adsorption of acids were calculated and discussed. The maximum removal of acids was observed around 97% and 76% at 25℃ for 5-amino-2-chlorotoluene-4-sulfonic acid and chlorhydric acid, respectively.     

硫脲改性D301树脂的制备及其对AuCl_4~–的吸附性能

使用硫脲对一种苯乙烯系阴离子交换树脂——D301树脂进行改性,先在D301树脂大分子链上接枝聚甲基丙烯酸缩水甘油酯(PGMA),然后通过硫脲与PGMA的环氧基的开环反应制得硫脲改性D301树脂(TD301)。对TD301进行了扫描电子显微镜、傅里叶变换红外光谱、元素分析等表征,研究了硫脲改性条件对TD301吸附性能的影响,并考察了TD301对AuCl_4~–的吸附动力学行为。结果表明,TD301适宜的硫脲改性条件为硫脲用量2 g,反应温度90℃,反应时间8 h;在环境温度25℃,氯金酸溶液pH值为2的情况下,所制得的TD301对AuCl_4~–的吸附量可以达到300.4 mg/g;此外,TD301具有优良的再生与重复使用性能。     

动态吸附法从草甘膦生产废水中回收有效成分的工艺

引言草甘膦[N-(膦羧甲基)甘氨酸,(HO)2P(O)CH2NHCH2COOH]是一种高效广谱的灭生性、内吸传导型优秀除草剂。1971年由美国D.D.贝尔德等发现,由美国孟山都公司开发生产,到20世纪80年代已经成为世界上销售量最大、增长速度最快的除草剂品种之一[1-4]。草甘膦的合成方法有多种[5-9],国内生产厂家大都采用甘氨酸(NH2CH2COOH)法,其生产废水中残留成分主要有草甘膦、甘氨酸、氯化钠等[10-11]。用吸     

大孔树脂分离发酵苹果酸的静态吸附工艺研究

通过5种大孔树脂对苹果酸吸附量的比较,其中阴离子树脂D301G吸附率最大。据此探讨了的D301树脂在不同时间、发酵液浓度、转速、pH、温度等影响因素下对静态吸附容量的影响。最终确定最佳操作条件为:转速150r/min、温度37℃、pH为5、吸附时间2 h、发酵液浓度10%。     

离子交换树脂对白扦中莽草酸的分离纯化

建立了离子交换树脂分离纯化白扦中莽草酸的工艺条件和参数。通过研究D261、D296、D301-R、D301-G、D290、201*7(717)、D201和D280共8种离子交换树脂对莽草酸的吸附和解吸附能力,筛选出最佳树脂为D290,确定了最佳的吸附与解吸附工艺参数,吸附条件为pH=6、25 ℃、流速为3 mL/min;脱附条件为：洗脱液为2.5%NaOH水溶液,洗脱流速为3 mL/min。莽草酸样品溶液经D290树脂吸附与脱附后回收率为92.53%,纯度由2.97%提高到46.76%,提高了15.74倍。实验结果表明,D290树脂对莽草酸的吸附量大,脱附容易,可以应用于莽草酸的分离纯化。     

以弱碱性树脂去除废水中5-氨基-2-氯甲苯-4-磺酸和盐酸：平衡及动力学

考察了废水中5-氨基-2-氯甲苯-4-磺酸（CLT）和盐酸（HCl）在弱碱性离子交换树脂D301R上的吸附。研究了吸附平衡及动力学行为。结果表明两种酸在D301R树脂上的吸附遵循Langmuir吸附平衡模型;CLT吸附动力学过程与二级反应模型相吻合;HCl与一级反应模型吻合得较好;吸附过程为孔扩散控制。CLT在树脂上的吸附度大于HCl。计算了吸附过程热力学参数并进行了讨论。     

Adsorption of 2-naphthalenesulfonic acid/sulfuric acid/sulfurous acid from aqueous solution by iron-impregnated weakly basic resin:Equilibrium and model

Commercial grade weakly basic resin D301 was impregnated with iron through a simple method using ferric chloride. Experiments for single, bisolute and trinary competitive adsorption were carried out to investigate the adsorption behavior of 2-naphthalenesulfonic acid (NSA), sulfuric acid and sulfurous acid from their solution at 298K onto the novel hybrid iron impregnated D301(Fe-D301). Adsorption affinity of NSA on Fe-D301 was found to be much higher than that of sulfuric acid, while adsorption affinity of sulfuric acid was slightly higher than that of sulfurous acid. The data of single-solute adsorption were fitted to the Langmuir model and the Freundlich adsorption model. The non-ideal competitive adsorbed model coupled with the single-solute adsorp-tion models were used to predict the bisolute and trinary-solute competitive adsorption equilibria. The NICM coupled with the Langmuir model yields the favorable representation of the bisolute and trinary-solute compet-itive adsorption behavior.     

弱碱性树脂吸附分离丙酮酸的特性研究

Uptakes of pyruvic acid for two types of commercially available weakly basic polymer sorbents, D301G and D301R, have been measured over a wide pH range and at various salinities of MgSO4. The results show that the overloading adsorption of pyruvic acid occurs on both weakly basic polymer sorbents, and the overloading models can predict the experimental data of uptake very well. The overloading value for D301G is larger than that for D301R. The adsorption isotherm of pyruvic acid for both polymeric sorbents is greatly affected by the solution pH and MgSO4 concentration in the aqueous phase, and a high recovery efficiency of pyruvic acid from aqueous solution can be obtained at the solution pH around 2.     

Integration of a coagulation step in a cometabolism sequencing batch reactor for the treatment of DSD acid wastewater from a reduction process

4,4-Diaminostilbene-2,2′disulfonic acid (DSD acid) wastewater from a reduction process is characterized by slow biodegradation. With a coagulation step as pretreatment, the contaminant can be efficiently removed by a cometabolism sequencing batch reactor (SBR) in the presence of glucose. Since a part of COD from DSD acid wastewater was colloidal and refractory, coagulation was applied as the pretreatment process, which demonstrated that the optimal concentration of aluminum sulfate was 90 mg/L. In the biological section, reduction efficiencies for COD, chromaticity and NH₄⁺-N were 84%, 93% and 92%, respectively, when working with 10 h and pH 7.0. In addition, dehydrogenase activity was proven to be a good parameter which can characterize the microorganism activity in this study.     

D301树脂的胺基化改性及其对AuCl4-的吸附性能

以D301树脂表面的胺基与过硫酸铵构成氧化-还原引发体系,将单体甲基丙烯酸缩水甘油酯(GMA)接枝聚合到D301树脂表面,制得接枝材料D301-g-PGMA;通过聚甲基丙烯酸缩水甘油酯(PGMA)分子链上的环氧基团与乙二胺中胺基的开环反应,实现接枝材料的胺基化改性,制得吸附材料D301-g-APGMA,考察了接枝聚合条件对接枝率的影响及胺基化反应条件对胺基含量的影响,对材料的结构进行了表征,研究了其对AuCl4-的吸附性能. 结果表明,在GMA用量10 mL、过硫酸铵为单体质量的1.5%及40℃条件下反应18 h, PGMA接枝率达41.15%. 胺基化改性时,在90℃下反应8 h,D301-g-PGMA上环氧键的开环率达91.67%. 改性后D301-g-APGMA对AuCl4-的吸附能力比D301树脂有较大提升,吸附容量达276.74 mg/g. D301-g-APGMA具有良好的再生与重复使用性能.     

Efficiently removing phenols from aqueous solution using amino acid functionalized D301 resins

ABSTRACT

Amino acid functionalized D301 resins (Tyr-D301, Phe-D301, and Ala-D301) are successfully prepared to remove phenols. The influences of adsorption condition on adsorption ability and the practical application value are investigated. The functionalized D301 resins possess strong adsorption ability toward phenol by ways of hydrogen bond interaction. The adsorption capacity of Tyr-D301, Phe-D301, and Ala-D301 is 388.2, 368.4, and 321.5 mg· g^?1 at 293 K and pH of 2, respectively. The adsorption process could be described satisfactorily by Lagergren-first-order model and Langmuir model. The rate constant is 0.057, 0.042, and 0.035 min^?1, respectively. The functionalized D301 can be used to dispose wastewater containing phenols.     

动态混合微曝气内电解预处理DSD酸生产废水

采用动态混合微曝气内电解预处理DSD酸生产废水,有效提高了废水的可生化性,m(BOD5)/m(COD)由0.12上升到0.33。微曝气内电解最佳工况条件为:炭铁质量比2:1、铁炭床与内电解反应器的体积比1:4、曝气时间360 min,废水COD和色度的去除率分别达到了74.3%和95%。动态混合的合适混合比为2:1,对COD和色度的去除率分别达到了52.4%和80%。     

以树脂吸附为主的集成工艺处理高盐有机废水

以增塑剂废水为研究对象,采用"预处理+树脂吸附+硫酸盐还原相UASB+微氧曝气+产甲烷相UASB+生物接触氧化+混凝沉淀"的集成工艺,研究该集成工艺的处理效果。结果表明:树脂吸附系统对COD和邻苯二甲酸的去除率分别为98.65%和96.59%,集成工艺出水COD为62~122 mg/L,NH3-N为5.8~9.6 mg/L,SS为19~45 mg/L,出水水质满足《污水综合排放标准》(GB 8978—1996)一级标准。该集成工艺可以有效回收邻苯二甲酸,削减废水中的有机物和氨氮含量。