Pilot study on regulating the efficacy of bioleakage by adding sand bedding layer to bioactivated carbon filters in water plants

IF 6.7 2区 工程技术 Q1 ENGINEERING, CHEMICAL
Dingxun Ma , Zhiqiang Fan , Mengyue Niu , Xianchun Tang , Hongbin Chen , Shiting Liu
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引用次数: 0

Abstract

Ozone Bioactivated Carbon (OBAC) filters are widely used in the deep treatment section of urban water treatment plants in China. However, there is a general lack of effective control measures for microbial leakage of OBAC filters in the effluent water, especially during periods of high influent volume. It has a potential significant impact on the biosecurity of the water supply. In this study, a pilot study was conducted at Water Plant A to investigate the effect of adding quartz sand layers with different particle size at the bottom of the activated carbon layer on controlling microbial leakage under nine months operating conditions. It was found that at a filtration rate of 10 m/h and thicknesses of 1.8 m for the activated carbon layer and 0.4 m for the quartz sand layer, the average retention rate of microorganisms reached 92 %. The quartz sand layer could form biofilm and its biomass could reach about 50 % of the activated carbon layer in the same area. The use of a quartz sand layer with a wide range of particle sizes (0.5–1.1 mm) and an “air backwashing with intensity of 15 L/(m2·s) for 3 min with 1~2 min standing and exhausting with water backwashing with intensity of 8~9.5 L/(m2·s) for 8 min” backwashing method not only achieved a good backwashing effect but also keep the interface between the carbon and sand clear thus solving the problem of mixed carbon and sand layers.
在水厂生物活性炭过滤器中添加砂垫层调节生物渗漏效果的中试研究
臭氧生物活性炭(OBAC)过滤器在中国城市水处理厂的深度处理部分得到广泛应用。但是,目前普遍缺乏有效的控制OBAC过滤器出水微生物泄漏的措施,特别是在高进水量期间。它对供水的生物安全具有潜在的重大影响。本研究在a水厂进行了中试研究,考察了在9个月的运行条件下,在活性炭层底部添加不同粒径的石英砂层对控制微生物泄漏的影响。结果表明,当过滤速率为10 m/h,活性炭层厚度为1.8 m,石英砂层厚度为0.4 m时,微生物的平均滞留率可达92%。石英砂层可形成生物膜,其生物量可达到相同面积活性炭层的50%左右。采用粒径范围广(0.5 ~ 1.1 mm)的石英砂层和“空气反洗强度为15 L/(m2·s),静置1~2 min,反洗时间为3 min,排风反洗强度为8~9.5 L/(m2·s),反洗时间为8 min”的反洗方法,既取得了良好的反洗效果,又保持了碳砂界面的清洁,解决了碳砂混合的问题。
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来源期刊
Journal of water process engineering
Journal of water process engineering Biochemistry, Genetics and Molecular Biology-Biotechnology
CiteScore
10.70
自引率
8.60%
发文量
846
审稿时长
24 days
期刊介绍: The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies
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