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Kinetics and capacities of non-reactive phosphorus (NRP) sorption to crushed autoclaved aerated concrete (CAAC)

Journal of Environmental Sciences 2023年第5期127卷 799-810页

作者： Shuting Shen Xiang Li Zhuofan Geng xiwu lu School Energy and Environment Southeast UniversityNanjing 210096China ERC Taihu Lake Water Environment Wuxi Wuxi 214135China

With growing interest in resource recovery and/or reuse,wastematerials have been considered a promising alternative for phosphorus(P)adsorption because they are low-cost and easily *** autoclaved aerated concrete(CAAC),as representative construction waste,has been extensively studied for P removal in ecological technologies such as treatment ***,most of the previous studies focused on the adsorption of orthophosphate,namely reactive phosphorus,and lacked attention to non-reactive phosphorus(NRP)which is widely present in *** study presents the first investigation on the potential and mechanism of CAAC removing four model NRP *** isotherm and kinetics of NRP onto CAAC indicate that the removal of NRP was a chemisorption process and also involved a two-step pore diffusion *** desorption experiment shows that different NRP species showed varying degrees of *** NRP was irreversibly adsorbed on *** the model compounds considered in this study,the adsorption capacity and hydrolysis rate of organophosphorus were much less than that of inorganic ***,the adsorption of different NRP species by CAAC in the mesocosm study was different from the results of laboratory adsorption experiments,and the possible biodegradation was essential for the conversion and removal of *** findings confirmed the validity of CAAC for NRP removal and the potential advantages of CAAC in terms of costs and environmental *** study will contribute to a better understanding of NRP conversion and environmental fate and that can be the basis for a refined risk assessment.

关键词： Non-reactive phosphorus Crushed autoclaved aerated concrete Phosphorus removal Sorption Wastewater treatment

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Role of biologic components in a novel floating-bed combining Ipomoea aquatic, Corbicula fluminea and biofilm carrier media

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Frontiers of Environmental Science & Engineering 2014年第2期8卷 215-225页

作者： Hailiang SONG Xianning LI Wei LI xiwu lu School of Energy and Environment Southeast University Nanjing 210096 China Engineering Research Center for Water Environmental Protection of Taihu Lake Southeast University Wuxi Branch Wuxi 214135 China

A novel floating-bed incorporated with water spinach （Ipomoea aquatica）, Asiatic clam （Corbicula fluminea）, and carrier media supported biofilm was developed for eutrophic water purification. The contribu- tions of each biologic component to the removals of total nitrogen （TN）, total phosphorus （TP） and Chl.a were examined. The nutrient removals due to the direct uptake by either water spinach or Asiatic clam were less than 10%, suggesting a negligible role of biologic assimilation and leaving the biofilm as the indispensable biologic compo- nent in the floating-bed. Chl.a was reduced mainly by Asiatic clams via filter-feeding. Meanwhile, the digestion and excretion of Asiatic clams benefited the proliferation of nitrifying and denitrifying bacteria, resulting in the improvement of TN removal. In summary, the synergetic effects of water spinach, Asiatic clams and biofilms would promote the eutrophic water treatment performance of floating-bed in comparison with the conventional floating- bed with vegetation as the single biologic component.

关键词： floating-bed Corbicula fluminea biofilm cartier eutrophication

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Microbial community characterization,activity analysis and purifying efficiency in a biofilter process

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Journal of Environmental Sciences 2013年第4期25卷 677-687页

作者： Hong Xiang xiwu lu Lihong Yin Fei Yang Guangcan Zhu Wuping Liu School of Energy and Environment Southeast University Key Laboratory of Environmental Medicine and Engineering Ministry of Education School of Public Health Southeast University Guizhou Provincial Center for Disease Control and Prevention

The growth and metabolism of microbial communities on biologically activated carbon （BAC） play a crucial role in the purification of drinking water. To gain insight into the growth and metabolic characteristics of microbial communities and the efficiency of drinking water treatment in a BAC filter, we analyzed the heterotrophic plate count （HPC）, phospholipid, dehydrogenase, metabolic function and water quality parameters during start-up and steady-state periods. In the start-up process of the filter with natural biofilm colonization, the variation in heterotrophic plate count levels was S-curved. The total phospholipid level was very low during the first 5 days and reached a maximum value after 40 days in the filter. The activity of dehydrogenase gradually increased during the first 30 days and then reached a plateau. The functional diversity of the microbial community in the filter increased, and then reached a relatively stable level by day 40. After an initial decrease, which was followed by an increase, the removal rate of NH4＋-N and COD_Mn became stable and was 80% and 28%, respectively, by day 40. The consumption rate of dissolved oxygen reached a steady level after 29 days, and remained at 18%. At the steady operation state, the levels of HPC, phospholipid, dehydrogenase activity and carbon source utilization had no significant differences after 6 months compared to levels measured on day 40. The filter was shown to be effective in removing NH4＋-N, NO2--N, CODMn, UV254, biodegradable dissolved organic carbon and trace organic pollutants from the influent. Our results suggest that understanding changes in the growth and metabolism of microorganisms in BAC filter could help to improve the efficiency of biological treatment of drinking water.

关键词： biologically activated carbon microbial community microbial biomass and activity metabolic function pollutant removalrate

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Research on Mechanism of Diversified Investment and Financing in Building Ecological Cities

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Chinese Journal of Population,Resources and Environment 2008年第1期6卷 52-56页

作者： Dai Shiming lu xiwu Qin Xing School of Energy and Environment Southeast University Nanjing Jiangsu 210096 China Environmental Protection Administration of Nantong Nantong Jiangsu 226006 China

Ecological city is the advanced mode of harmonious development of city. Constant improvement is being made in the development of ecological city. However, building ecological city is an enormous project that calls for a huge amount of capital. The government fund is far from adequate. This paper probes into the fund issue and discusses in detail the mechanism of investment and financing in building ecological city from various aspects such as diversification of the investment subjects and the modes of financing.

关键词： ecological city investment and financing diversification mechanism

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Phosphate removal from wastewater by model-La(Ⅲ)zeolite adsorbents

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Journal of Environmental Sciences 2008年第6期20卷 670-674页

作者： NING Ping BART Hans-Jorg LI Bing lu xiwu ZHANG Yong Department of Environmental Science and Engineering Kunming University of Science and Technology Kunming 650093 China Lehrsmhl für Thermische Verfahrenstechnik TU Kaiserslautern D-67653 Kaiserslautern Germany Department of Environmental Engineering Southeast University Nanjing 210096 China

Phosphorus is one of the primary nutrients which leads to eutrophication and accelerates aging process in enclosed water bodies. Because of the poor phosphorus selectivity of other adsorbents, the novel La（Ⅲ）-modified zeolite adsorbent （LZA） was prepared by modifying 90 nm zeolite with lanthanide to selectively remove phosphate in the presence of various omnipresent anions, such as sulfates, bicarbonates, and chlorides. Through batch and fixed bed operation, the following optimum conditions were obtained： concentration of lanthanum chloride solution 0.05 mol/L; solid/liquor ratio 1/25; pH 10; calcination temperature 550℃; time 1 h. The value of the Freundlich model constants Kf and 1/n were found to be 16.76 mg/L and 0.2209, respectively. In addition, when calculated at pH 6.0, distribution coefficient KD could be as high as 36.6. Furthermore, in the alkaline pH range, solution of 0.8 mol/L NaCl was used to regenerate the saturated LZA, which could reach the high regeneration efficiency as high as 100%. Because of the good selectivity and regenerability of LZA, it might serve as a potential way for advanced phosphate removal from the sewage containing other anions.

关键词： phosphate adsorption zeolite regeneration distribution coefficient

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A Formal Model for BPEL4WS Description of Web Service Composition

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Wuhan University Journal of Natural Sciences 2006年第5期11卷 1311-1319页

作者： GU xiwu lu Zhengding College of Computer Science and Technology HuazhongUniversity of Science and Technology Wuhan 430074Hubei China

Communicating Sequential Processes （CSP） is a kind of process algebra, which is suitable for modeling and verifying Web service composition. This paper describes how to model Web service composition with CSP. A set of rules for translating composition constructor of Business Process Execution Language for Web Services （BPEL4WS） to CSP notations is defined. According to the rules that have been defined, the corresponding translation algorithm is designed and illustrated with examples . The methods for model checking, model verification and model simulation are also introduced.

关键词： communicating sequential processes Web service Web service composition business process execution language for Web services

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Modeling of THMs and HAAs Formation in Distribution System upon Chlorination

Modeling of THMs and HAAs Formation in Distribution System u...

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2011 SSITE International Conference on Future Material Research and Industry Application(FMRIA 2011)

作者： Rong Ma xiwu lu Department of Energy and Environment University of Southeast Nanjing

Seasonal variations of trihalomethanes（THMs） and haloacetic acids（HAAs） were investigated within distribution systems of the Yangtze river treatment plant in Nanjing City（China）.The investigation was based on one year sampling program, undertaken from the fall and winter of the year 2007 to the spring and summer of the year 2008A multiple linear regression model was developed to predict THMs and HAAs concentrations in distribution waterRoutinely measured parameters including free residual chlorine, ultraviolet light absorbance at 254 nm（UV254）, temperature, p H and NH3-N in distribution water was used to develop the model for the prediction of THMs and HAAsThe developed models provided satisfactory estimations of the concentrations of THMs and HAAs and the model regression coefficients of THMs and HAAs are 0.90 and 0.87, respectivelyFurther, the Durbin-Watson values confirm the reliability of the two modelsThe results indicate that variations of free residual chlorine, ultraviolet light absorbance at 254 nm（UV254）, temperature, p H and NH3-N can described the formation of THMs and HAAs in distribution water by the multiple linear regression technique.

关键词： trihalomethanes(THMs) haloacetic acids(HAAs) modelingl Yangtze river

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反硝化脱氮除磷-侧流磷回收工艺效能

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农业工程学报 2016年第10期32卷 207-212页

作者：邹海明吕锡武安徽科技学院资源与环境学院凤阳233100 东南大学能源与环境学院南京210096

为了调查反硝化同步脱氮除磷-侧流磷回收新工艺的工艺效能,该试验在该工艺稳定运行条件下评价其污染物（化学需氧量、总氮、NH＋4-N和PO3-4-P）去除能力和磷回收能力。结果表明：当进水中化学需氧量、总氮、NH＋4-N和PO3-4-P的质量浓度... 详细信息

为了调查反硝化同步脱氮除磷-侧流磷回收新工艺的工艺效能,该试验在该工艺稳定运行条件下评价其污染物（化学需氧量、总氮、NH＋4-N和PO3-4-P）去除能力和磷回收能力。结果表明：当进水中化学需氧量、总氮、NH＋4-N和PO3-4-P的质量浓度为239.2-259.5、39.6-43.8、38.2-41.8和8.72-11.40 mg/L,出水中相应的质量浓度分别为15.2-21.6、8.5-9.6、3.6-4.7和0.31-0.49 mg/L,满足国家《城镇污水处理厂污染物排放标准》（GB18918-2002）一级A排放标准;COD主要在厌氧池被去除,NH＋4-N主要在好氧硝化池中去除;污水中磷的去除主要由诱导结晶磷回收和生物除磷两部分组成;整个工艺中,磷去除效率为95.9%,其中诱导结晶磷去除率占总去除效率的71.5%,表明该工艺具有较大磷回收潜力。此外,后置曝气池可对出水中COD、NH＋4-N和PO3-4-P浓度起着把关作用,有助于提高出水水质。

关键词：污水处理脱氮结晶反硝化脱氮除磷磷回收

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饮用水中卤乙酸的生殖和发育毒性研究进展

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卫生研究 2008年第2期37卷 242-244页

作者：向红吕锡武东南大学环境工程系南京210096

卤乙酸是饮用水中主要的氯化消毒副产物,由于难以挥发和降解,其健康危害特别是生殖与发育毒性研究越来越受到重视。许多研究表明一些卤乙酸影响实验动物生殖细胞功能和胚胎发育,导致生育力降低胎仔畸形和生长迟缓。本文就饮用水中卤乙... 详细信息

卤乙酸是饮用水中主要的氯化消毒副产物,由于难以挥发和降解,其健康危害特别是生殖与发育毒性研究越来越受到重视。许多研究表明一些卤乙酸影响实验动物生殖细胞功能和胚胎发育,导致生育力降低胎仔畸形和生长迟缓。本文就饮用水中卤乙酸生殖与发育毒性的研究工作进行具体论述。

关键词：饮用水卤乙酸生殖与发育毒性环境毒理

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紫外-微臭氧工艺降解微囊藻毒素的动力学特性

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东南大学学报（自然科学版） 2005年第3期35卷 438-441页

作者：朱光灿吕锡武东南大学土木工程学院南京210096

研究了紫外微臭氧工艺降解微囊藻毒素(MC)的动力学过程与特性.结果表明:MC-RR,MC-YR和MC-LR三种MC在紫外微臭氧反应器中的降解过程为一级动力学反应,半降解时间分别为74.5,32.2和24.2min;降解速率不受初始藻毒素浓度的影响,湖水中天然... 详细信息

研究了紫外微臭氧工艺降解微囊藻毒素(MC)的动力学过程与特性.结果表明:MC-RR,MC-YR和MC-LR三种MC在紫外微臭氧反应器中的降解过程为一级动力学反应,半降解时间分别为74.5,32.2和24.2min;降解速率不受初始藻毒素浓度的影响,湖水中天然有机物(NOM)能捕获自由基,抑制MC的降解,葡萄糖对MC的降解没有影响;紫外微臭氧工艺主要通过HO·等自由基对MC侧链Adda基中不饱和共轭双键的破坏而降解MC,并使藻毒素脱毒.紫外微臭氧工艺可用于降解饮用水中MC.

关键词：微囊藻毒素臭氧工艺动力学特性紫外动力学过程动力学反应天然有机物降解过程降解速率共轭双键自由基对 MC 反应器葡萄糖不饱和饮用水湖水

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