臭氧氧化用于污水回用的试验研究

对臭氧氧化深度处理生活污水进行了长期试验,以评价臭氧氧化对生活污水深处理的效能。研究结果表明,当臭氧投加量16 mg/L、臭氧氧化时间15 min,臭氧氧化后出水COD、UV254、色度、浊度、NH3-N的平均值分别为51.0 mg/L、0.140 cm-1、27.4度、5.0 NTU和18.7 mg/L,臭氧氧化对上述5个水质指标的平均去除率分别为30.3%、22.0%、53.7%、32.1%、14.6%。单独依靠臭氧氧化技术很难将上述5个水质指标降低到较低水平,因此,需要将臭氧氧化作为预处理技术与其他工艺进行组合,利用组合工艺对再生水进行深度处理将有广阔的发展前景。     

臭氧催化氧化应用于工业园区污水处理厂深度处理工艺的选择及设计

污水处理厂深度处理中增设臭氧催化氧化单元可将二级生化出水中的难降解有机物转化为小分子有机物,提高BOD_5/COD,结合后续的工艺(如BAF、活性炭)可保证出水达标排放。分析对比了近年来工程中常用的臭氧氧化、Fenton氧化等高级氧化技术,结合工程设计案例分析臭氧催化氧化的效果,为臭氧催化氧化技术的应用提供参考。     

臭氧在市政污水处理中的应用

臭氧用于市政污水的处理,在杀菌消毒、漂白、脱色、除臭、去味等方面显著效果.介绍了臭氧的氧化能力、分解特性及腐蚀性,并阐述了一套完整的臭氧处理系统必须由5部分组成.结合无锡城北污水处理厂运用臭氧工艺的实例,以期为类似工程运用提供有益的参考和借鉴.     

湘江长沙段饮用水源水除藻工艺研究

文章分析了湘江长沙段水源水藻类的主要特征及其影响因子,研究了常规处理、臭氧生物活性炭深度处理组合;臭氧氧化、常规混凝沉淀处理及生物活性炭深度处理组合;陶粒滤池生物预处理、常规处理及活性炭深度处理组合三种组合除藻工艺对某自来水厂的藻类去除效果。     

臭氧氧化法在深度处理难降解有机废水中的应用

臭氧氧化作为一种有效的深度处理技术,对难降解有机废水具有良好的降解功效.介绍了臭氧的性质及氧化机理,分析了臭氧氧化法在处理纺织印染废水、造纸废水、垃圾渗滤液、炼油废水、焦化废水等难降解有机废水中的应用,指出了臭氧氧化存在的问题.     

面向景观回用的污水处理厂工艺优化与水质安全保障成套技术研究与示范

针对工业废水和生活污水混合处理,工业废水对处理系统冲击负荷大、污水生物处理系统运行不稳定,微絮凝—砂滤深度处理药剂消耗量大等城镇污水处理厂面临的实际难题,提出了“全程控制、整体优化、减排降耗”的污水处理厂优化运行和水质安全保障原则与技术路线.研究开发出包括废水生物抑制性监控技术、A2/O工艺稳定运行与强化脱氮技术、微絮凝—砂滤工艺优化和自动加药技术以及污水深度处理雾化曝气、臭氧氧化技术等在内的成套技术和关键设备.A2/O工艺优化运行与强化脱氮技术和微絮凝—砂滤深度处理工艺优化技术结合,在保障污水处理厂出水水质的同时降低了能耗和药耗,关键水质指标稳定达到景观用水标准,有力地支持了污水处理厂尾水景观利用,显著改善了水环境质量.     

臭氧—曝气生物滤池处理难生物降解废水的试验研究进展

臭氧与曝气生物滤池组合工艺,可提高难生物降解废水的处理效率。文章综述了该组合工艺在不同行业难生物降解废水处理中色度、COD去除率等方面的研究进展,表明组合工艺对不同原水的处理效果明显。指出臭氧与曝气生物滤池组合工艺作为一种深度处理工艺是非常适合我国国情的水处理技术,尤其对我国今后中水回用、企业污水闭路循环以及＂零排放＂...     

徐州市市区中水回用可行性分析

1概述 中水主要是指生活污水、工业废水、雨水等城市污水经二级处理后，根据不同用途和要求，再经过适当处理，如混凝、沉淀、过滤、消毒，或利用膜分离技术、臭氧氧化、活性炭吸附等深度处理工艺，从而得到的水。     

混凝-臭氧联用技术深度处理煤气化废水的研究

利用混凝沉淀联用臭氧氧化技术对煤气化废水进行了深度处理。结果表明混凝阶段最佳条件为:p H 6.50、聚硫酸铁用量300 mg/L、有机高分子絮凝剂聚丙烯酰胺用量1~3 mg/L。混凝处理后,废水的COD、色度和UV254去除率分别为65.5%~68.3%、95.0%和66.2%~67.9%。混凝沉淀上清液经臭氧氧化处理50 min后,COD可降至35.3 mg/L,色度降至4倍,UV254降至0.183。经过混凝-臭氧联用技术深度处理后,COD、色度和UV254的综合去除率分别为94.6%、99.0%和97.4%,出水p H经调节后主要指标均达到《污水综合排放标准》(GB 8978—1996)一级排放标准。     

臭氧活性炭深度处理工艺除藻效能研究

通过中试除藻试验,研究了臭氧活性炭深度处理工艺的除藻效能。结果表明,经过预臭 氧化和常规工艺处理后,深度处理工艺可再去除67％的含藻量。工艺参数:臭氧投加量2 mg／L,接 触时间15 min,活性炭滤池滤速10 m／h,停留时间12 min。探讨了预臭氧化和深度处理两种组合工 艺的除藻机理和影响因素。     

Risk assessment for organic trace compounds in wastewater: comparison of conventional and advanced treatment.

The elimination of organic trace compounds in municipal wastewater was analysed at three German wastewater treatment plants. Additionally, the effects of advanced treatment, membrane filtration, adsorption and oxidation processes were investigated. To assess the ecotoxicity of effluents, a number of tools were used: substance-specific evaluation, case studies for combined effects and risk assessment on the basis of cumulative parameters. The results of the research projects revealed that aquatic environmental risks can be reduced significantly using advanced treatment technologies for wastewater treatment plants.     

臭氧技术在印染废水处理中的应用

介绍了O3/H2O2、O3/UV、催化臭氧化等臭氧高级氧化技术在印染废水处理中的应用,简述了臭氧与生化法组合工艺的优势,指出臭氧技术与生化处理组合工艺在印染废水处理中有广阔的应用前景。     

ANAMMOX工艺在生活污水深度处理中的应用研究

随着水环境质量的恶化,高能低耗的污水深度处理技术成为当前研究热点,尤其是对于低C/N比的城市生活污水脱氮技术的研究。试验以城市生活污水的二级出水为研究对象,采用ANAMMOX下向流生物滤池,当二级出水NH3-N=15-35mg/L,CODCr=25-45mg/L,TOC=9-12mg/L,水温=25-28℃时,ANAMMOX下向流生物滤池脱氨率达80%-100%,不仅适用于处理高氨废水,也可用于城市生活污水深度处理中。试验发现pH可以用来指示ANAMMOX反应的进行,同时也可以用来指示ANAMMOX反应进程的快慢。试验中还发现,厌氧氨氧化反应速率与NO2--N含量有关,原水中NO2--N含量的增多有利于ANAMMOX工艺处理效果。     

水环境中PPCPs的臭氧氧化和高级氧化技术

药物和个人护理用品(PPCPs)是最近十年引起关注的一类新型有机微量污染物,其对人类健康和生态环境安全的影响受到了越来越多的关注.传统的给水处理和污水处理工艺都不能有效去除水中的PPCPs,因此有必要采用臭氧氧化、高级氧化等工艺进行深度处理.臭氧是选择性氧化剂,其与PPCPs的反应受PPCPs的基团电子特性和溶液pH的影响;高级氧化技术产生的羟基自由基·OH氧化能力强,与PPCPs的反应没有选择性,主要包括O_3/H_2O_2、UV/H_2O_2、UV/TiO_2、芬顿和光芬顿氧化等.这些深度处理工艺的采用受一些因素的限制,同种工艺或不同工艺的组合能达到更高的去除效率.     

厌氧—混凝—高级氧化工艺处理转运站污水的中试研究

开发了转运站污水厌氧生化调节池和基于混凝沉淀及高级氧化技术的快速处理设备,在转运站现场建立中试系统,优化系统运行的工艺参数,研究中试规模下组合工艺对转运站污水的处理效果,并进行了技术经济分析。该组合工艺可将CODCr从进水的15 000 mg/L降至1 230 mg/L,油脂从进水的10 000 mg/L以上降至50 mg/L,色度去除率在90%以上,出水澄清透明且无恶臭。     

Oxidative treatment characteristics of biotreated textile-dyeing wastewater and chemical agents used in a textile-dyeing process by advanced oxidation process.

The oxidative treatment characteristics of biotreated textile-dyeing wastewater and typical chemicals such as desizing, scouring, dispersing and swelling agents used in the textile-dyeing process by advanced oxidation process were experimentally studied. The refractory organic matters remained in the effluent of biological treatment process without degradation may be suitable for the improvement of biodegradability and mineralized to CO2 by combined ozonation with and without hydrogen peroxide. On the other hand, the refractory chemicals contained in the scouring agent A and swelling agent may not be mineralized and their biodegradability may not be improved by ozonation. However, the BOD/DOC ratio of scouring agent B increased from 0.3 to 0.45 after ozonation. Based on the results described above, advanced treatment process involving the ozonation without and with the addition of hydrogen peroxide, followed by biological treatment was proposed for the treatment of refractory wastewater discharged from the textile-dyeing process.     

Phenol wastewater remediation: advanced oxidation processes coupled to a biological treatment.

Nowadays, there are increasingly stringent regulations requiring more and more treatment of industrial effluents to generate product waters which could be easily reused or disposed of to the environment without any harmful effects. Therefore, different advanced oxidation processes were investigated as suitable precursors for the biological treatment of industrial effluents containing phenol. Wet air oxidation and Fenton process were tested batch wise, while catalytic wet air oxidation and H2O2-promoted catalytic wet air oxidation processes were studied in a trickle bed reactor, the last two using over activated carbon as catalyst. Effluent characterisation was made by means of substrate conversion (using high liquid performance chromatography), chemical oxygen demand and total organic carbon. Biodegradation parameters (i.e. maximum oxygen uptake rate and oxygen consumption) were obtained from respirometric tests using activated sludge from an urban biological wastewater treatment plant (WWTP). The main goal was to find the proper conditions in terms of biodegradability enhancement, so that these phenolic effluents could be successfully treated in an urban biological WWTP. Results show promising research ways for the development of efficient coupled processes for the treatment of wastewater containing toxic or biologically non-degradable compounds.     

水环境中药物污染、检测及去除研究进展

分析国内外水体中药物污染现状及其差异,详述水环境中痕量药物残留分析典型流程及固相萃取结合色谱 质谱联用的检测方法,总结污水处理厂、传统氧化工艺、高级氧化工艺、活性炭吸附和新型水处理技术去除效果和机理,认为在我国对各类水体进行药物污染调查、明确"优先污染药物"及研究水处理工艺药物去除效果等方面是今后研究的重点。     

Toxicity reduction in an industrial nitro-aromatic wastewater plant: an assessment and a proposed improvement

In this study, the performance of a typical Chinese industrial nitro-aromatic wastewater project (operational capacity: 3,000 m(3)d(-1)) was evaluated using chemical properties and toxicity data. Additionally, the relationship between the removal of organic pollutants and toxicity reduction was investigated throughout the whole-process wastewater treatment. Current advanced treatment reduced the dissolved organic carbon by 40% compared with biologically treated wastewater effluent (BTWE), but the acute toxicity and early life-stage toxicity increased significantly. For instance, the acute toxicity of the current advanced treated wastewater was 450% greater than that of the untreated BTWE. With the aim of effectively decreasing the toxicity of the effluent, several efficient adsorption technologies were assessed and compared for further treatment of BTWE. Coagulation and/or oxidation coupled with activated carbon adsorption, hypercrosslinked resin adsorption, or MIEX(?) technology was helpful for improving chemical indices and reducing toxicity. Among these adsorption treatment technologies, hypercrosslinked resin adsorption was more effective at removing most of the toxicants than MIEX(?) technology, and it also had better regeneration efficiency and mechanical properties compared with activated carbon. Therefore, hypercrosslinked resin adsorption may be a promising technology for enhancing organic pollutant removal and toxicity reduction of BTWE from nitro-aromatic factories.     

Advanced electro-Fenton degradation of biologically-treated coking wastewater using anthraquinone cathode and Fe-Y catalyst

The electrocatalytic activity of bare and 2-ethyl anthraquinone-modified graphite felt (2-EAQ/GF) toward oxygen reduction was investigated using a cyclic voltammetry technique in a neutral solution. The prepared cathodes were tested for electrogeneration of H2O2 and electro-Fenton oxidation (EFO) treatment of neutral coking wastewater (CW) after biological process, using a graphite anode and Fezeolite Y catalyst. The results showed that (i) H2O2 yield and current efficiency greatly depended on cathodic potential and materials; (ii) hydroxyl radicals, generated from Fe-zeolite Y-catalyzed H2O2 decomposition, played a great role in EFO treatment, while anodic direct and indirect oxidation was insignificant; (iii) chemical oxygen demand, total organic carbon (TOC) and acute toxicity of wastewater decreased by 40-50, 30-40 and 50-60%, respectively, and biodegradability increased after 1 h of EFO treatment. Due to the free-pH adjustment, EFO presents a potential engineering application for advanced treatment of CW.