聚酯废水的生化处理

UASB-SBR方法是目前处理有机废水采用较多的工艺。本文介绍了用此方法对聚酯废水进行处理的工艺状况,并介绍了有关的运行管理经验。针对聚酯废水的特点,充分结合生化系统的特性,实现整套工艺的稳定、经济运行以及方便、灵活的操作管理。     

采用MBR工艺处理聚酯废水的工程实例

将MBR工艺用于聚酯废水的处理,提高了活性污泥浓度,极大地改善了聚酯废水处理中好氧过程的效率.采用厌氧-MBR-氧化塘联合工艺,对珠海某聚酯公司的废水设施进行改造后,在保持较高的COD去除率的同时.出水各项指标也达到广东省地方排放标准(DB 44/26-2001)的一级排放标准.与原有的厌氧-生物接触氧化法-氧化塘工艺相比,处理成本降低了40%以上,表明该工艺具有良好的经济技术可行性,且性能稳定、效果良好.     

聚酯生产废水处理方法研究进展

聚酯是化纤工业的重要原料。文中对国内外聚酯工业生产废水处理工艺进行了综述和评价,并提出了对该类废水治理的建议。     

MBR工艺处理聚酯废水的运行管理要点

介绍了厌氧-MBR-氧化塘联合工艺用于聚酯废水处理的工艺流程和处理效果。重点探讨了工艺过程中主要构筑物的运行、控制要点。介绍了MBR池在运行管理中常见的故障,进行了原因分析,并给出排除的方法。采用该法处理聚酯废水,提高了活性污泥浓度,极大地改善了聚酯废水处理中好氧过程的效率,具有良好的经济技术可行性,处理效果持续稳定。     

Fenton-UASB-生物活性炭处理高浓度聚酯废水

采用Fenton-UASB(升流式厌氧污泥床)-生物活性炭对高浓度聚酯废水进行微生物降解处理。首先对高浓度聚酯废水进行预处理,然后对影响UASB启动阶段CODcr(化学需氧量)去除率的重要因素(如p H、碱度、挥发酸浓度以及容积负荷等)进行了分析,并对稳定阶段CODcr去除率和污泥形态进行了考察;最后利用生物活性炭对聚酯废水进行了处理。研究结果表明:聚酯废水经氧化预处理后,其CODcr去除率为30%;上述聚酯废水分别经UASB、生物活性炭反应器处理后,两者的CODcr去除率均为65%。     

聚酯酯化废水预处理技术中的绿色经济分析

介绍了聚酯装置酯化废水的预处理工艺,并对预处理工艺所产生的绿色经济循环发展做了效益分析。酯化废水通过高效低耗的处理过程,回收获得纯度达99.5%以上的乙醛与10%的乙二醇。与常用的焚烧法相比,此工艺不仅减少了废水废气的排放,还实现了资源的再利用,给企业带来收益的同时也响应了绿色生产的号召,产生了显著的社会效益。     

聚酯废水处理方法综述

文章从物化、生化两方面综述了聚酯废水的处理方法及效果,为以后聚酯废水的处理提供参考和依据。     

聚酯装置真空系统的设计探讨

分析比较不同聚酯工艺装置的真空系统 ,探讨其国产化的条件。进口聚酯工艺的真空系统各具特色 ,但基本设计思想都是在满足工艺要求前提下 ,要防止堵塞、延长运转周期 ,降低废水、废气排放量。国产 5P6 0 2 6 1型真空泵完全满足钟纺10 0t d终聚釜的工艺要求     

厌氧生物膜法处理聚酯高浓度废水

采用上流式厌氧生物膜工艺处理PET聚酯生产高浓度废水实际运行情况，表明厌氧生物膜法抗冲击负荷能力较强，温度低于30℃仍有较高的去除率，微碱性有利于甲烷菌的生长。     

生物接触氧化法处理高浓度聚酯及纺丝油剂废水的微生物相与COD的降解关系

为挺高“生化法”治理高浓度聚酯及纺丝油剂化纤废水的效率,稳定工艺,采用微生物学和生化等方法,揭示了“好氧池”生物膜的微生物组成的类型和数量与废水中COD(化学需氧量)的关系。共分离、鉴定了26种、七大类微生物。结果表明,它们有很长的食物链,其中细菌是降解废水有机残留物的主角。它们的生长繁殖需满足一定条件才能使处理工艺稳定,提高效率,降低能耗和运转费用。     

PET生产中EG的流向分配及流失

探讨了PET生产中EG随工艺废水废气而流失的原因,通过优化EG的流量分配、合理调整EG分离塔的塔顶参数,控制终缩聚釜刮板冷凝器、冷凝效果及温度,可以更好地保证PET产品品质指标,进一步降低PET生产中EG单耗、减少废水中污染物的排放量。     

Recycling of Waste Poly(Ethylene Terephthalate) with Naphthalene and Neutral Water

The waste poly(ethylene terephthalate) (PET) powder dissolution/reprecipitation was carried out in a batch operation at atmospheric pressure at various temperatures ranging from 180–220°C at temperature intervals of 10°C. Particle sizes of the waste PET ranged from 50–512.5 µm and operation time, which ranged from 30–90 min, were optimized. Dissolution/reprecipitation of the waste PET was carried out in naphthalene (solvent) and neutral water (nonsolvent), respectively. Dissolution/reprecipitation of the waste PET was increased with operation time and temperature. Dissolution/reprecipitation of PET was decreased with increase in the particle size of the waste PET. The waste PET particle size and agitator speed required for complete recycling of the waste PET were also optimized. Analyses of the waste PET and the recycled PET collected after the reprecipitation process was undertaken by determination of various physical properties. The operation applied at lesser time and with cheaper solvent/nonsolvent, resulted in excellent quality of the recycled PET collected after the reprecipitation process. This process of recycling of the waste PET has an industrial significance due to most economical operation for commercialization.     

聚酯生产废水废气的工艺处理

介绍了目前聚酯生产废水、废气处理的工艺流程,工艺运行参数和汽提塔的运行现状。指出目前聚酯生产废水、废气的工艺处理存在的问题。从废气工艺流程优化和汽提塔效率优化2个方面提出了一些建议和解决方案。     

Investigation of the effect of hydrolysis products of postconsumer polyethylene terephthalate bottles on the properties of alkyd resins

Hydrolysis of waste polyethylene terephthalate (PET) flakes obtained from grinding postconsumer bottles was carried out at 200–230°C and molar ratios of PET/H₂O were taken as 1/5; 1/10; 1/20. The reaction products, when extracted with boiling water, yielded a water soluble crystallizable fraction (WSCF) and a water insoluble fraction (WIF). These fractions were characterized by acid and hydroxyl value determinations and DSC analysis. WSCF and WIF were used for preparation of alkyd resins. Five long oil alkyd resins were prepared from phthalic anhydride (PA) (reference alkyd resin) or hydrolysis products of the waste PET (PET‐based alkyd resin), pentaerithrithol (PE), soybean oil fatty acid (SOFA), and ethylene glycol (EG). Film properties and thermal degradation stabilities of these alkyd resins were investigated. Drying time, hardness, alkaline resistance, and thermal oxidative degradation resistance of the PET‐based alkyd resins are better than these properties of reference resin. The results show that hydrolysis products of waste PET obtained from postconsumer bottles are suitable for manufacturing of alkyd resins. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers     

PET工业废水对设备管线腐蚀状况的分析

检测缩聚装置排出的工业废水及装置使用的循环乙二醇 ,分析讨论了装置设备管线的腐蚀情况 ,提出乙二醇排残系统和工业废水系统设备管线选材的建议     

再生聚酯料的制造及应用

对全球废聚酯瓶的回收状况、回收和造粒技术及应用聚酯再生料生产纤维、服装和非织造布的现状作了介绍,并指出全球废聚酯瓶回收在今后几年会有很大增长,应重视废聚酯瓶回收和造粒过程中的废水处理。     

Alkyd resins based on waste PET for water-reducible coating applications

Simultaneous glycolysis and neutral hydrolysis of waste PET flakes obtained from grinding post-consumer bottles was carried out in the presence of xylene and an emulsifier at 170 °C. The product was separated from ethylene glycol (EG), water, and xylene by filtration, and was extracted by water at boiling point thrice. The remaining solid was named water insoluble fraction (WIF). The filtrate was cooled to 4 °C, and the crystallized solid obtained by filtration was named water soluble crystallizable fraction (WSCF). These fractions were characterized by acid value (AV) and hydroxyl value (HV) determinations. WSCF and WIF were used for preparation of the water-reducible alkyd resins. Three long oil alkyd resins were prepared from phthalic anhydride (PA; reference alkyd resin) or depolymerization product of the waste PET (PET-based alkyd resin), glycerin (G), fatty acids (FA), and glycol (EG; reference alkyd resin) or depolymerization product of the waste PET (PET-based alkyd resin). Film properties and thermal degradation stabilities of these alkyd resins were investigated. Physical properties (drying times and hardness) and thermal degradation stabilities of the PET-based alkyd resin is better than these properties of the reference alkyd resin.     

Alkyd resins synthesized from postconsumer PET bottles

Simultaneous glycolysis and neutral hydrolysis of waste PET flakes obtained from grinding postconsumer bottles was carried out in the presence of xylene and an emulsifier at 180 °C. The product was separated from EG, water and xylene by filtration and was extracted by water at boiling point three times. The remaining solid was named water insoluble fraction (WIF). The filtrate was cooled to 4 °C and the crystallized solid obtained by filtration was named water-soluble crystallizable fraction (WSCF). These fractions were characterized by acid value (AV), hydroxyl value (HV) determinations. WSCF and WIF were used for preparation of the alkyd resins. Three long oil alkyd resins were prepared from phthalic anhydride (PA) (reference alkyd resin) or depolymerization product of the waste PET (PET-based alkyd resin), glycerin (G), sunflower oil fatty acids (SOFA) and glycol (EG) (reference alkyd resin) or depolymerization product of the waste PET (PET-based alkyd resin). Film properties and thermal degradation stabilities of these alkyd resins were investigated. Physical properties (drying times, hardness and abrasion resistance) and thermal degradation stabilities of the PET-based alkyd resins are better than these properties of the reference alkyd resin.     

聚酯瓶回收再生技术及应用

简述了采用自有技术开发的聚酯瓶回收再生生产线的工艺流程,如预洗、破碎、清洗,并对装置的自动化控制及污水处理技术进行了介绍。     

酯化工艺塔的改造

阐述了聚酯酯化反应以及工艺塔的工作原理,分析实际运行中存在的问题,通过对原设备改造,提高了酯化各项工艺稳定性,降低了生产污水的化学需氧量。