Determination of assimilable organic carbon (aoc) in ozonated water with acinetobacter calcoaceticus

The effect of ozone application in drinking water on the production of assimilable organic carbon (AOC) was evaluated. The typical procedure to determine AOC is suggested by van der Kooij, which is the method of bacterial growth measurement by colony‐forming units using the strain P17 and/or NOX. The bacterial indicator species used for this study is Acinetobacter calcoaceticus which was isolated and identified while ozonating Nakdong river water. This strain could never be isolated from the raw water, but this strain was the predominant isolate in the ozonated water. Within a short incubation time, this organism was found to replicate well on acetate and oxalate as the sole carbon sources. The yield coefficients of this organism for acetate and oxalate are the same order of magnitude as the value of P17 and NOX. With full‐scale experiments, A. calcoaceticus concentration was found to increase after ozonation, but did not decrease upon chlorination. In laboratory‐scale experiments with Yongsan river water, aldehyes were found to be produced in proportion to the ozone dose. The raw water contains low concentrations of aldehydes, but has a high AOC concentration. A correlation between aldehyde production and AOC production was observed in the tested water with ozonation.     

Drink-driving in community sports clubs: Adopting the Good Sports alcohol management program

Throughout the developed world, community sports clubs are a high-risk setting for alcohol-impaired driving. The Good Sports program accredits community sports clubs to encourage implementation of alcohol-focussed harm-reduction and safe-transport strategies. This study tested for associations between participation in the Good Sports program and reduced rates of drink-driving amongst club members. Multilevel modelling indicated that for each season a club was in the program there was an 8% reduction in the odds of drink-driving. These findings may arise due to clubs with lower rates of alcohol use maintaining longer involvement in the program. However, the findings are also compatible with the intention of the Good Sports program to reduce the risk that club members will drive whilst alcohol impaired.     

Self-consistent analysis of the band structure of doped lattice-matched GaNAsBi-based QWs operating at 1.55 μm

Band structures of n–i doped lattice-matched GaNAsBi/GaAs quantum wells are studied theoretically using a self-consistent calculation (based on the envelop function formalism) combined with the 16-band anti-crossing model. Operating at 1.55 μm, these QWs can represent active zones of temperature-insensitive optoelectronic device applications intended for optical fiber communications. We have calculated physical parameters of the structures such as the confining potential profiles, the Fermi level, the subband energies and their corresponding wavefunctions as well as the oscillator strength of inter-band transitions, the subband occupations, and the confined electrons density distributions. Finally, the absorption coefficient spectra of GaNAsBi-based QWs are also computed.     

超滤膜组合工艺在青浦第三水厂设计中的应用

提出采用高效沉淀、臭氧生物活性炭与超滤膜组合工艺处理黄浦江上游微污染原水,并介绍了该工艺在上海市青浦第三水厂中的具体应用与设计参数。实际运行表明,该工艺可确保出厂水浊度<0.1 NTU、耗氧量<1.5 mg/L、氨氮<0.2 mg/L,处理效果稳定,供水安全性高。     

天津滨海国际机场二期扩建工程T2航站楼地下室防水工程设计与施工

介绍了天津滨海国际机场T2航站楼扩建项目地下室防水工程采用BAC双面自粘防水卷材的施工技术,重点介绍了地下室底板、侧墙、顶板防水施工中采用该类自粘卷材的施工方法、注意事项以及相关节点部位的处理方法。     

高锰酸盐预氧化对生物活性炭硝化性能的影响

通过测定生物活性炭上硝化菌的数量与活性,考察高锰酸盐预氧化对后续生物活性炭硝化性能的影响.结果表明,高锰酸盐预氧化后的生物活性炭与单独生物活性炭上亚硝酸菌和硝酸菌的分布具有相同规律;但高锰酸盐预氧化后生物活性炭工艺中亚硝酸菌和硝酸菌数量、亚硝化速度及硝化速度都要高于单独的生物活性炭,这是高锰酸盐促进后续生物活性炭工艺去除氨氮和亚硝酸盐氮的主要原因.     

船用一体化生物活性炭装置反冲洗技术条件优化

反冲洗是保证生物活性炭装置正常运行的重要因素。以船用污水深度处理装置一体化生物活性炭为研究对象,探究反冲洗对于装置污染物去除能力恢复的影响,得出了装置恢复时间;选取9种反冲洗条件,考察装置反洗后8 h后,装置污染物去除能力的变化。结果表明:污染物去除率随着反冲洗时间推移先降低后逐步升高,8 h后趋于稳定,此时COD去除率为60%,氨氮去除率为10%。对比不同反冲洗条件下对于装置性能的影响分析,反洗强度控制在5.0 L/(m2·s),反洗时间为7 min时为较优反冲洗条件,COD去除率达到79.8%,氨氮去除率为5.3%。     

O3/BAC工艺应用于城市污水深度处理

为使再生水适合不同用途,对经过混凝沉淀和砂滤处理的再生水进行了臭氧-生物活性炭的深度处理.在臭氧消耗量和反应时间分别为5 mg/L和10 min,BAC空床停留时间(EBCT)为10 min的条件下,臭氧-生物活性炭工艺对CODMn、DOC、UV254和色度平均去除率为32.4%、29.2%、48.6%和80.1%,出水CODMn、DOC、UV254和色度的平均值分别为3.3 mg/L、4.0mg/L、0.05 cm-1和2.0倍;臭氧生物活性炭工艺出水SDI《4,从而满足了反渗透系统的进水要求.     

无锡市充山水厂深度处理技术改造工程

无锡市充山水厂原采用常规处理工艺,由于太湖水源水污染,特别是有机物、氨氮和藻类污染日趋严重,使出厂水水质安全性难以得到保障.因此在中试基础上对充山水厂进行了技术改造,改造后新工艺为:BIOSMEDI生物滤池-气浮池-臭氧接触池-生物活性炭过滤器-石英砂过滤器,并将消毒剂由原来的氯改为ClO2.改造后的运行结果表明,出厂水水质完全达到《城市供水水质标准》(CJ/T 206-2005).改造工程设计规模1万m3/d,总投资1 500万元,水厂运行费0.86元/m3,较原常规处理增加0.17元/m3.