臭氧氧化技术深度处理焦化废水研究进展

叙述了臭氧氧化技术在焦化废水深度处理中的应用和进展,介绍了臭氧氧化技术处理污染物的反应机理,比较了不同焦化废水深度处理技术优缺点,阐述了臭氧氧化技术在焦化废水深度处理中具有COD去除率高、脱色效果明显、操作简单和运行成本低的优势,并提出臭氧氧化技术联合其他废水处理技术对提高焦化废水处理效率的研究成果和工程实际应用状况,展望了臭氧氧化技术在焦化废水深度处理中的发展方向。     

废水臭氧催化氧化深度处理试验研究

采用单独臭氧及三种不同催化剂对烟气脱硫含碱废水迚行臭氧催化氧化试验,试验结果表明,合适催化剂投加的条件下,可以大大提高臭氧氧化效率,减少臭氧投加量。COD去除率最高可达88%,BOD5、B/C分别提高了88、675倍,大大改善了废水的可生化性,有利于迚行废水深度处理。     

臭氧联合高级氧化方法处理有机废水的技术进展

臭氧因其强氧化能力而在废水处理中得到广泛的应用,但单独采用臭氧氧化技术处理废水存在处理费用高、利用率低和矿化程度低等问题。高级氧化方法与臭氧联用,可大大促进臭氧分解,提高有机物的去除率。因此臭氧与紫外线、过氧化氢、超声波、及催化剂等多种高级氧化方法用于有机废水处理已经成为目前研究的热点,并取得了显著的进步。     

应用臭氧氧化技术深度处理抗生素废水的研究进展

综述近几年臭氧氧化技术对抗生素废水处理效果的研究进展基础上,分析了臭氧投加量、溶液的pH值、反应温度和催化剂等因素对臭氧氧化工艺处理抗生素废水效果的影响,抗生素的去除机制及氧化产物,最后结合臭氧氧化组合工艺在处理抗生素废水的实际应用,展望了臭氧氧化工艺深度处理抗生素废水所面临的主要问题及未来发展前景。     

应用臭氧氧化技术深度处理抗生素废水的研究进展

综述近几年臭氧氧化技术对抗生素废水处理效果的研究进展基础上,分析了臭氧投加量、溶液的pH值、反应温度和催化剂等因素对臭氧氧化工艺处理抗生素废水效果的影响,抗生素的去除机制及氧化产物,最后结合臭氧氧化组合工艺在处理抗生素废水的实际应用,展望了臭氧氧化工艺深度处理抗生素废水所面临的主要问题及未来发展前景。     

臭氧氧化技术在废水处理中的应用

随着社会经济的发展,科学技术的进步,各行业都在处理废水中使用先进的科学技术。臭氧氧化技术作为一种全新的废水处理技术,可以使废水中稳定与难降解的污染物得到合理降解,而且不会产生再次污染,所以获得了普及的推广使用。基于目前具体应用中,选择直接混合废水与臭氧,不具有较高的臭氧利用率,而且极易彻底被矿化,而催化臭氧氧化技术作为这一方面重要的发展趋势,为此必须深入研究这一技术。鉴于此,重点分析废水处理中臭氧氧化技术的具体应用。     

臭氧技术处理印染废水研究进展

印染废水经二级处理后,其残余的污染物及色度仍会对环境造成很大影响。因此,高效处理技术的研发十分必要。臭氧在水中具有较高的氧化还原电位,能够降解并矿化部分有机污染物。臭氧氧化与其它水处理技术相结合产生氧化性更强的羟基自由基,能够快速、无选择性地降解有机物,是处理印染废水行之有效的方法。综述了几种高效、实用的臭氧处理技术:臭氧/紫外光法、臭氧/过氧化氢法、臭氧/活性炭法和臭氧/生物炭法。并指出了该技术在工程应用中存在的问题:反应器内泡沫的大量产生、沉淀物的生成以及臭氧对反应设备的腐蚀等。提出了开发不同处理工艺的有效组合是臭氧技术应用于印染废水处理中的研究和发展方向。     

臭氧氧化工艺在印染废水处理中的应用进展

采用混凝法、吸附法等常规处理方法处理印染行业废水难度较大,高效处理技术的研发十分必要.介绍了臭氧氧化工艺及其与催化、超声、UV、活性炭、电化学等的联用在印染废水处理中的应用进展.指出了上述技术目前存在的问题及臭氧技术处理印染废水的发展方向.     

臭氧预氧化在废水处理中的研究进展

臭氧由于其特殊的化学性质,作为一种强氧化剂在废水生化处理前进行臭氧预氧化,可以极大提高COD的去除率,降低UV254和色度,同时提高废水的可生化性,并且在使用和处理过程中的产物对环境污染很小,是一种极为有效的预处理方法。结合臭氧的性能特点,综述了臭氧预氧化在废水处理中的研究成果,包括应用于处理医药,农药废水,印染废水,垃圾渗滤液,芳香族化合物废水等;总结了在应用方面存在的问题,并展望了臭氧预处理的研究方向。     

氧化水处理与电化学催化技术

臭氧具有较强的氧化性,能够广泛应用在污水处理中。电化学催化臭氧系统中,使用臭氧发生器将氧气转化为臭氧,并将所得臭氧和氧气的混合气体通过电化学废水处理反应器中,通过电化学反应将氧气还原为过氧化氢,产生氧化能力极强的羟基自由基,使有机废水中的污染物降解并完全矿化。电催化臭氧技术是一种经济、高效而且对环境友好的水处理技术。     

Ozonation of Animal Wastes Containing Oxytetracycline

The efficiency of ozonation on the degradation of oxytetracycline, a veterinary antibiotic, has been investigated in both cow manure and synthetic animal feeding operation wastewater at varying experimental conditions. With a rapid degradation of antibiotic in synthetic wastewater, ozonation improved its biodegradability and eliminated bacterial toxicity caused by oxytetracycline. The degradation rate of oxytetracycline depended on pH and applied ozone dose, but not initial antibiotic concentration in wastewater. In the case of manure treatment, ozonation efficiency in terms of oxytetracycline degradation was negatively affected by moisture and antibiotic content of manure. The degradation rate of oxytetracycline in manure slowed down upon the extension of treatment time since ozone could not react with strongly adsorbed antibiotic on manure. Increase in humic and fulvic acid carbon and mineral nitrogen content was an indicator for the improvement of fertilizing value of manure by ozonation.     

铁元素在废水处理工艺中的应用研究进展

综述了不同价态的铁在废水处理工艺中的应用原理,及铁碳微电解工艺、双金属催化工艺、Fenton法、类Fenton工艺、UV/Fe2+(Fe3+)催化臭氧工艺、高铁酸盐应用于水处理的研究应用现状。对比了催化体系与单独臭氧体系对水中有机物的去除效果。得出Fe2+(Fe3+)作为催化剂应用于高级氧化法是今后应继续深入研究并是最有前景的难降解废水处理工艺的结论。     

Regression Modeling of Ozonation Process in Wastewater Treatment Plants for Reduction of Waste Activated Sludge

This research was based on the hypothesis that waste activated sludge (WAS) from municipal wastewater treatment plants can be reduced by ozonation of excess biosolids to induce cell lysis and by promoting utilization of intracellular products released by ozonation of biosolids in the aeration basins. In this research, mathematical modeling studies were performed in order to define process design and major components of ozonation. The main purpose of the model simulations was to evaluate the effect of operational parameters of the ozonation system (such as dosage and duration of ozonation) and to determine the amount of solids to be ozonated in order to achieve desired mass reductions in WAS. This modeling study focused on identification of design parameters and their suggested range of operation. The model presented in this study does not intend to detail and analyze the impact of the scientific variables in the ozonation mechanism, nor does it try to model the biosolids destruction mechanisms when ozonation is applied. The computer model simulations indicated that zero biosolids yield conditions can be achieved if more biosolids than was grown on the influent wastewater was processed through the ozonation system. The simulations suggested that zero biosolids yield conditions can be observed if 2.4 times as much biosolids as was grown on the influent wastewater was processed through the ozonation column, with a daily R of about 0.08 mg O₃/mg TSS-day. Furthermore, zero biosolids yield conditions can also be observed if only the amount of waste biosolids grown on the influent wastewater was processed through the ozonation column with a higher average daily R of 0.2 mg O₃/mg TSS-day.     

Treatment of Wastewater Coming from Painting Processes: Application of Conventional and Advanced Oxidation Technologies

The process of car body painting is one of the manufacturing processes that may involve the use of organic solvents for surface treatments. As a result of this process, wastewaters containing raw materials and auxiliary products used during the cleaning step are produced. The main objective of this study is to find an appropriate purification technique to eliminate or reduce the contamination present in this kind of wastewater. Different treatments were investigated: ozonation, ozonation combined with hydrogen peroxide, photo-Fenton treatment, and coagulation- flocculation.     

生物质炭吸附及其与O3耦合处理生物质废水

针对我国生物质废水污染问题,建立生物质炭吸附、生物质炭/O3耦合处理生物质废水的工艺,并与O3氧化工艺比较。生物质炭吸附处理生物质废水的工艺中,研究了生物质炭吸附生物质废水中的有机物的吸附平衡曲线,考察了吸附时间、生物质炭投加量、不同炭种对COD脱除率的影响。生物质炭吸附生物质废水中的有机物的吸附平衡曲线符合Langmuir方程,吸附平衡常数为8.833×10-5 L/mg,饱和吸附容量为1.136×106 mg/g;20℃下,生物质炭的投加量为20g/100mL废水,吸附15min,废水相COD值可从12496mg/L降至761mg/L,有机物脱除率可达93.9%。单独O3降解及先O3降解后生物质炭吸附的两步法工艺不适合生物质废水的处理,生物质炭/O3协同的一锅法处理废水效果最佳,在生物质用量仅为1g/100mL废水,臭氧流速为150mL/min,处理时间20min时,COD脱除率高于90%。     

Feasibility of Sludge Ozonation for Stabilization and Conditioning

A pilot-scale sludge treatment plant was built to investigate the feasibility of ozonation processes for waste activated sludge treatment. Ozonation of wastewater sludge resulted in mass reduction by mineralization as well as by supernatant and filtrate recycle. Another advantage of sludge ozonation is a significant improvement of settleability and dewaterability. Experimental results showed that mass reduction of 70% and volume reduction of 85% compared with the control sludge was achieved through the sludge ozonation at a dose of 0.5?gO₃/gDS. It is also interesting to note that the filterability deteriorates up to ozone dose of 0.2?gO₃/gDS and then improves considerably at a higher ozone dose. The filterability could be improved by chemical conditioning even at a low ozone dose. The economic feasibility by cost analysis reveals that ozonation processes can be more economical than other alternative processes for sludge treatment and disposal at small-sized wastewater treatment plants.     

Microbial Counts and Antibiotic Resistances during Conventional Wastewater Treatment and Wastewater Ozonation

ABSTRACT

In view of the increasing interest in the occurrence and spread of antibiotic-resistant bacteria due to wastewater treatment systems into the environment, total colony counts and antibiotic-resistant bacteria were determined in regard to a conventional wastewater treatment plant and its upgrade with a wastewater ozonation. To cope with the elimination of conventionally not sufficiently decimated micropollutants, the Eifel-Rur Waterboard built a full-scale ozonation plant at the stream Wurm, which is strongly influenced by WWTP discharge. To evaluate the effect of wastewater ozonation on the receiving water’s biocenosis, extensive monitoring of the WWTP and its receiving water is performed before and after implementation of ozonation treatment and in preliminary pilot-scale ozonation experiments. Total colony counts showed no significant difference between the stream Wurm upstream and downstream of the WWTP and were slightly below the average of comparable investigations. Antibiotic resistances showed only a little differences between WWTP and the stream samples. Furthermore, no accumulation of antibiotic resistances was found at the conventional WWTP. Pilot-scale ozonation yielded a reduction of total colony counts of fecal indicator bacteria Escherichia coli and Enterococci after ozone treatment. The pilot-scale experiments gave no indication that ozone treatment leads to a rise in antibiotic resistances against selected antibiotics of different antibiotic classes.     

催化臭氧化技术在废水处理中的应用

阐述了均相催化臭氧化和非均相催化臭氧化技术在废水处理中的应用研究进展,并提出了技术发展趋势与存在的问题。非均相催化臭氧化技术是现代催化技术与环境化学处理技术的组合,其中催化剂具有活化臭氧、提高臭氧氧化降解能力的作用。该技术具有降解能力强、效率高、不产生二次污染等优点,将在环保领域发挥越来越大的作用。     

Applicability of Ozonation Combined with Electrolysis to 1,4-Dioxane Removal from Wastewater Containing Radical Scavengers

In this paper, applicability of ozonation combined with electrolysis as an advanced oxidation process for the removal of 1,4-dioxane from synthetic wastewater, has been studied. The combined process easily decomposed 1,4-dioxane, and two byproducts were detected in treated water. Although bicarbonate alkalinity was a strong radical scavenger, its influence was abated by air-stripping of carbon dioxide at the anodic compartment of the reactor. Free chlorine produced through anodic oxidation of chloride ion accelerated the COD removal from wastewater, despite the fact that this ion acted as a weak radical scavenger. The combined process was demonstrated to be applicable to the treatment of wastewater containing high concentration of bicarbonate alkalinity and chloride ions.     

焦化废水深度处理回用技术的创新与实践

为解决焦化企业新水不够用、废水无处排的难题,开发出焦化废水深度处理回用技术。结合3个典型案例,介绍了在工程应用方面的技术创新和实践经验。根据不同企业的废水特征、现有工艺和回用途径,采用技术经济合理的组合工艺,满足用户的个性化需求,使过去作为重要污染源的焦化废水"变废为宝",实现了废水的无害化、减量化和资源化,取得了良好的环境效益和经济效益。