ADSORPTION OF PHENYLACETIC ACID ON MACROPOROUS POLYMERIC ADSORBENTS

Several macroporous polymeric adsorbents (NDA-999, XAD-8, X-5 and XAD-2) were employed in the study to adsorb phenylacetic acid from aqueous solution. Effect of salt and ambient temperature on adsorption was studied using NDA-999 adsorbent and the adsorption process conforms to Freundlich抯 model reasonably. Adsorption dynamics were conducted in batch experiments in order to make clear the mechanism of adsorption process. It is proved that the squared driving force mass transfer model can be adopted to elucidate the process. The treatment process of industrial wastewater containing high strength of phenylacetic acid was proposed for cleaner production of phenylacetic acid.

STUDY ON THE TREATMENT OF INDUSTRIAL WASTEWATER CONTAINING TRIETHYLAMINE WITH POLYMERIC ADSORBENTS

The treatment of the industrial wastewater, in which the concentration of triethylamine (TEN) and CODcr was around 3450 mg/L and 22400 mg/L respectively, was studied by adsorption of macroporous resins. Results demonstrate that the polymeric adsorbent CHA-111 has excellent effect on the adsorption and desorption of TEN. The concentration of TEN in the effluent is less than 30mg/L, and the removal efficiency of TEN and total CODcr exceed 99% and 95% respectively. The accumulation and resource reuse of TEN can be realized in this process.

STUDY ON THE TREATMENT OF 3—PHENOXY—BENZALDEHYDE INDUSTRIAL WASTEWATER WITH POLYMERIC ADSORBENT

In this paper the two effluents from PBA (3- phenoxy -benzaldehyde) productionprocess were treated by polymeric adsorbent CHA-lll. PBA or PBC(3-phenoxybenzoic acid) was recovered from the wastewater in the process of neutralization. As asecondary treatment method, adsorption with CHA-lll showed better efficency thanPhotocatalytic decomposition and solvent extraction. The optimal technologicalparameters were: adsorption: current velocity: 2.0 BV/hr(bed volume per hour), roomtemperature, desorption: current velocity:10 BV/hr 80℃8% sodium hydroxideaqueous solutions. In conclusion, 90.9% COD in the neutralizing wastewater and98. 4% COD in the hydrolysis wastewater are removed successfully.

TREATMENT AND RESOURSE REUSE OF INDUSTRIAL WASTEWATER FROM PRODUCTION PROCESS OF PHENYL ACETIC ACID

The effluent from phenyl acetic acid (PhCH2COOH) production process can betreated with NDA-999 macroporous polymeric adsorbent with about 100% removalefficiency of PhCH2COOK benzyl alcohol (PhCH2OH)and benzaldehyde (PhCHO) aswell as the decrease in Total Organic Carbon (TOC)from 4691mg/l to <300mg/L. 3. 7kgPhCH2COOH and 120kg NaCl will be recovered from per m3 wastewater and theadsorbent can be reused after being regenerated by NaOH aqueous solution andmethanol. Good economic, social and environmental results can be achieved with thismethod.

TREATMENT AND RESOURCE REUSE OF WASTEWATER FROM NAPHTHOL AS-E PRODUCTION PROCESS

The wastewater from naphthol As-E production process was treated with macroporous polymeric adsorbent NDA-222. Naphthol As-E and 2,3-acid in the wastewater could be removed completely and the Total Organic Carbon (TOC) of the wastewater was decreased more than 98% from 1655mg/L to less than 30mg/L. The adsorbates could be desorbed completely with NaOH aqueous solution.

THEATMENT OF WASTEWATER FROM PRODUCTION PROCESS OF 2,3-ACID

Wastewater from production process of 2,3-acid was treated by adsorption usingmacroporous resin NDA-708. After only one-step treatment by resin adsorption, removalefficiency of three kinds of naphthalene chemicals was above 99%, removal efficiency ofCODcr was above 96% Under proper operating condition, desorption efficiency wasaround 100%. The running records of the industrial facility showed that the naphthlenechemicals in desorption effluent could be reused without obvious influence on the qualityOf the product.

树脂吸附法处理高浓度混甲酚生产废水的研究

采用大孔吸附树脂ＣＨＡ－１１１，处理对申酚生产过程中产生的高浓度合酚废水，该树脂工作吸附量＞５０ｍｇ／ｍｌ，酚去除率＞９９％，ＣＯＤｃｒ去除率为５５％，除酚性能优于美国的ＡｍｂｃｔｌｉｔｃＸＡＤ－４。

树脂吸附法处理对硝基苯乙酮生产废水

采用AM 1吸附树脂和ND 90 0络合树脂对对硝基苯乙酮生产废水进行吸附处理 ,试验结果表明 ,使用 2种树脂串联的处理效果优于单独使用某一种树脂 ,而且ND 90 0络合树脂在前、AM 1吸附树脂在后串联处理的效果最好 ,废水体积为 30BV时 ,COD去除率为92 .8% ;脱色率为 10 0 % ,出水由原废水的橙红色变为无色。采用质量分数为 8%的NaOH溶液作为脱附剂 。

树脂吸附法处理1,2-重氮氧基萘-4-磺酸生产酸析母液废水的研究

研究了树脂吸附法处理 1,2 重氮氧基萘 4 磺酸生产酸析母液废水 ,考察了树脂吸附 脱附性能的影响因素 ,并确定了最佳工艺参数 .结果表明 ,NDA 4 0 9树脂对 1,2 ,4 酸氧体生产酸析母液废水的吸附脱附效果良好 .原废水呈深黑色 ,其中 1,2 ,4 酸氧体浓度为 80 0 0～ 90 0 0mg/L ,CODcr浓度为 10 0 0 0～ 110 0 0mg/L左右 ,处理后的出水无色透明 ,1,2 ,4 酸氧体浓度约为 85mg/L ,氧体去除率达 99% ,CODcr浓度小于 10 0mg/L ,CODcr去除率达 99% ;采用组合脱附剂对树脂进行洗脱再生 ,1,2 ,4 酸氧体的脱附率能稳定在 99%以上 .经过 12批次小试稳定性实验和四批次放大实验证明 ,NDA 4 0 9树脂对 1,2 ,4 酸氧体的吸附 脱附性能稳定 .该工艺简单 ,操作方便 ,技术先进 ,不仅能有效地处理废水 ,使其实现达标排放 ,而且能回收废水中宝贵的化工原料 ,实现环境效益、社会效益和经济效益的统一 。

吸附树脂及其在水与废水处理中的应用

主要论述了吸附树脂的分类、合成、性能及其在水处理中的应用,重点讨论了人工合成及天然高分子改性吸附树脂的合成、性能及其在微污染水源给水处理及废水处理中应用的研究进展。其由于在废物处理和资源回收方面的良好前景而受到青睐,并有逐渐取代活性炭成为新一代吸附剂的趋势,但对其工程化的应用尚需继续研究。最后展望了高分子吸附剂(吸附树脂)的研究及应用前景,提出了今后吸附树脂的研究发展方向。

树脂吸附法处理含邻苯二甲酸的废水

研究了含邻苯二甲酸的 1 ,4 -二羟基蒽醌染料生产废水的治理问题。采用树脂吸附工艺 ,当进水中邻苯二甲酸质量浓度为 50 0 0～ 70 0 0mg/L、CODCr为 80 0 0～ 1 0 0 0 0mg/L时 ,经处理后分别降至 1 0 0mg/L以下 ,吸附后的树脂用稀碱解吸 ,脱附率大于 99 8%。邻苯二甲酸回收率≥ 90 % ,晶体纯度高达 99 6%以上。处理后的出水可依据厂家要求回用到水洗工段作洗涤水或经简单中和后直接排放。在有效处理高浓度有机化工废水的同时实现了资源化。

树脂吸附法处理TDI加氢还原生产废水

研究了树脂吸附法处理甲苯二异氰酸酯(TD I)加氢还原生产废水的工艺过程.结果表明,NDA-8吸附树脂对该废水具有良好的吸附-脱附效果.经树脂吸附处理,废水中主要污染物2,4-二氨基甲苯和2,6-二氨基甲苯均得到完全去除,COD由6 300mg/L降为150mg/L以下,达到国家二级排放标准,采用稀盐酸可实现树脂的完全再生,高浓度脱附液经调碱和结晶,可回收2,4-二氨基甲苯和2,6-二氨基甲苯.

树脂吸附法处理黄连素模拟废水

利用树脂吸附法对黄连素模拟废水进行了试验研究,对5种大孔吸附树脂进行初步筛选,从中优选出最佳吸附树脂(大孔树脂H103)。考察了pH和树脂投加量对吸附效果的影响,绘制了动力学曲线和吸附等温线。结果表明:在黄连素浓度为1 000 mg/L,最佳初始pH为7.0的条件下,树脂最佳投加量为3.0 g。在最佳pH条件下,吸附等温线可用Freundlich等温吸附方程描述。

对氨基苯甲酸生产废水的树脂吸附预处理

采用超高交联吸附树脂处理芳香两性化合物对氨基苯甲酸(PABA)生产废水,通过静态吸附、动态吸附-脱附实验,研究确定了最佳的吸附-脱附工艺条件。结果表明,在常温和2 BV/h的吸附流量条件下,原废水不用调节pH值,直接经JX-101树脂吸附处理20 BV后,CODC r可从6 000 mg/L左右降至700 mg/L左右,CODC r去除率达88%以上,PABA的吸附去除率达99%以上。采用1 BV 8%氨水溶液+1 BV 4%氨水溶液+2 BV水作脱附剂,在313 K脱附温度和1 BV/h脱附流量的条件下,树脂脱附性能良好。该工艺简单,运行稳定,操作简便,可回收有用物质,有望实现工业化。

复合功能树脂吸附处理2-氨基吡啶生产废水的研究

采用中和法对2-氨基吡啶生产废水进行预处理,然后采用NDA-88复合功能吸附树脂固定床工艺对预处理过的废水进行动态吸附和脱附。实验结果表明,NDA-88树脂对2-氨基吡啶的吸附量为150.1 mg/g。每个周期处理废水30 BV(床体积),前12 BV出水COD由2 800 mg/L降至100 mg/L以下,后18 BV出水COD小于1 000 mg/L,COD去除率约76.8%。温度333 K时,以V(2 mol/LNaOH):V(C2H5OH))=1:1为脱附剂,体积5 BV时,脱附率92.5%。

聚丙烯酰-6-氨基吡啶的制备及其对重金属离子的吸附

以2,6-二氨基吡啶为原料,合成了功能单体2-丙烯酰-6-氨基吡啶,并将其与乙二醇二甲基丙烯酸酯共聚合成了聚合物吸附剂聚丙烯酰-6-氨基吡啶。考察了聚合物吸附剂对重金属离子的吸附分离性能。实验结果表明:在混合液中Cu2+,Zn2+,Cd2+,Ni2+的初始质量浓度均为10 mg/L、聚合物吸附剂加入量为5 g/L、溶液pH=7、吸附时间为10 min的条件下,聚合物吸附剂对各离子的吸附率均大于90%;采用浓度为0.5 mol/L的HCl溶液对吸附后的聚合物吸附剂进行洗脱,4种重金属离子的洗脱率均可达97%以上;该吸附剂具有很好的稳定性,重复使用11次后其对4种重金属离子的饱和吸附量均未有明显的下降。

树脂吸附法处理采矿塌陷区废水的研究

文章采用ND-90型超高交联吸附树脂吸附处理采矿塌陷区废水。原废水COD质量浓度为200￣230mg·L-1,经沉淀-树脂吸附法处理,处理量20BV,吸附流出液COD质量浓度为40～50mg·L-1,COD去除率≥80.23%,树脂经过碱液脱附后可重复利用且运行稳定。该处理工艺投资少、操作简便,为解决采矿塌陷区水体修复问题提供了一种新的方法。