Sen Peng

Tianjin University, T’ien-ching-shih, Tianjin Shi, China

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Publications (9)19.55 Total impact

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    ABSTRACT: Given few studies refer to the employment of constructed wetlands to polish secondary effluent and purify runoff simultaneously prior to replenishment of surface water, lab-scale combined oxidation pond-constructed wetland ecosystems used for treating the composite wastewater were established in this study, and the effects of four factors, each at four levels, on the treatment efficiency of the system were investigated through orthogonal experiment. The tested factors were (i) ratio of five-day biochemical oxygen demand (BOD5) to chemical oxygen demand (CODCr) (abbreviation B/C) in the influent, (ii) aeration position, (iii) aeration intensity (expressed as air/water ratio), and (iv) hydraulic residence time (HRT). Results showed that the sequence and degree of the influence of the tested factors were HRT**>aeration intensity**>aeration position*>B/C for CODCr removal, HRT**>aeration position*≈aeration intensity*>B/C for ammonia (NH4+-N) removal, HRT**>B/C**>aeration position**>aeration intensity** for total nitrogen (TN) removal and HRT**>aeration intensity>aeration position≈B/C for total phosphorus (TP) removal (* denotes significant influence (0.01<p<0.05) and ** denotes extremely significant influence (p≤0.01)). Although the optimal operating conditions for CODCr, NH4+-N, TN and TP removal in the system were quite different from each other, the comprehensive optimal operating conditions (B/C≈0.30, surface aeration, aeration intensity=3:1, HRT=2.0d) obtained by the comprehensive balance method for the operation of the whole system proved to be feasible and practicable, under which the average concentration removal percentages were 80.81%, 75.97%, 82.38% and 80.95% for CODCr, NH4+-N, TN and TP, respectively. Moreover, the wetland columns accounted for the greatest removal of pollutants in the combined system, while the oxidation pond conferred a buffer capacity to the system by allowing for high loading fluctuations and pre-treated the influent as well. This study also offers references for the analysis of the results of the multi-index orthogonal test.
    No preview · Article · Mar 2016
  • Likun Yang · Sen Peng · Jingmei Sun · Xinhua Zhao · Xia Li
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    ABSTRACT: Urban lakes in China have suffered from severe eutrophication over the past several years, particularly those with relatively small areas and closed watersheds. Many efforts have been made to improve the understanding of eutrophication physiology with advanced mathematical models. However, several eutrophication models ignore zooplankton behavior and treat zooplankton as particles, which lead to the systematic errors. In this study, an eutrophication model was enhanced with a stoichiometric zooplankton growth sub-model that simulated the zooplankton predation process and the interplay among nitrogen, phosphorus, and oxygen cycles. A case study in which the Bayesian method was used to calibrate the enhanced eutrophication model parameters and to calculate the model simulation results was carried out in an urban lake in Tianjin, China. Finally, a water quality assessment was also conducted for eutrophication management. Our result suggests that (1) integration of the Bayesian method and the enhanced eutrophication model with a zooplankton feeding behavior sub-model can effectively depict the change in water quality and (2) the nutrients resulting from rainwater runoff laid the foundation for phytoplankton bloom.
    No preview · Article · Jan 2016 · Environmental Science and Pollution Research
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    ABSTRACT: Given that few studies investigated the effects of aeration position (AP) on the performance of aerated constructed wetlands, the aim of this study was to evaluate the effects of AP on organics, nitrogen and phosphorus removal in lab-scale combined oxidation pond-constructed wetland (OP-CW) systems. Results showed that middle aeration allowed the CW to possess more uniform oxygen distribution and to achieve greater removals of COD and NH3-N, while the CW under bottom aeration and surface aeration demonstrated more distinct stratification of oxygen distribution and surface aeration brought about better TN removal capacity for the OP-CW system. However, no significant influence of artificial aeration or AP on TP removal was observed. Overall, AP could significantly affect the spatial distribution of dissolved oxygen by influencing the oxygen diffusion paths in aerated CWs, thereby influencing the removal of pollutants, especially organics and nitrogen, which offers a reference for the design of aerated CWs.
    No preview · Article · Sep 2015 · Bioresource Technology
  • Yue Zhang · Xinhua Zhao · Xinbo Zhang · Sen Peng
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    ABSTRACT: In the past decades, natural organic matter (NOM), which is a complex heterogeneous mixture of organic materials that are commonly present in all surface, ground and soil waters, has had an adverse effect on drinking water treatment. The existence of NOM results in many problems in drinking water treatment processes, and the properties and amount of NOM can significantly affect the efficiency of these processes. NOM not only influences the water quality with respect to taste, color and odor problems, but it also reacts with disinfectants, increasing the amount of disinfection by-products. NOM can be removed from drinking water via several treatment processes, but different drinking water treatment processes have diverse influences on NOM removal and the safety of the drinking water. Several treatment options, including coagulation, adsorption, oxidation, membrane and biological treatment, have been widely used in drinking water purification processes. Therefore, it is of great importance to be able to study the influence of different treatment processes on NOM in raw waters. The present review focuses on the methods, including coagulation, adsorption, oxidation, membrane, biological treatment processes and the combination of different treatment processes, which are used for removing NOM from drinking water.
    No preview · Article · Jun 2015 · Water Science & Technology Water Supply
  • Yue Zhang · Xinhua Zhao · Xinbo Zhang · Sen Peng
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    ABSTRACT: Three identical submerged ultrafiltration (UF) membranes with different pretreatment processes (coagulation, adsorption and ozonation) were compared with an individual UF membrane to investigate the performance of the process and characterize organic membrane foulants by natural organic matter (NOM) molecular weight distribution (MWD) and chemical fraction techniques. The results indicated that the preferred amount of organic matter removal was achieved in three integrated processes (coagulation/UF, adsorption/UF, ozonation/UF), and the trans-membrane pressure (TMP) increased at a rate much lower than that in an individual UF membrane. The ozonation pretreatment, with O3 as an oxidant, improved the > 10 kDa NOM fraction removal and hindered the < 3 kDa NOM fraction removal for raw water, while the adsorption pretreatment, with powdered activated carbon (PAC) as an adsorbent, improved the < 10 kDa NOM fraction removal. The total NOM content of internal foulants extracted from the three integrated processes was lower than UF, indicating that all three pretreatments could reduce the accumulation of NOM in the membrane pores. The PAC/UF had a distinct advantage for removing NOM in effluent. It is observed that the hydrophilic matter (HiM) chemical fraction removal rate of O3/UF was lower than in the other three processes.
    No preview · Article · Mar 2015 · Desalination
  • Likun Yang · Xinhua Zhao · Sen Peng · Guangyu Zhou
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    ABSTRACT: Eutrophication models have been widely used to assess water quality in landscape lakes. Because flow rate in landscape lakes is relatively low and similar to that of natural lakes, eutrophication is more dominant in landscape lakes. To assess the risk of eutrophication in landscape lakes, a set of dynamic equations was developed to simulate lake water quality for total nitrogen (TN), total phosphorous (TP), dissolve oxygen (DO) and chlorophyll a (Chl a). Firstly, the Bayesian calibration results were described. Moreover, the ability of the model to reproduce adequately the observed mean patterns and major cause-effect relationships for water quality conditions in landscape lakes were presented. Two loading scenarios were used. A Monte Carlo algorithm was applied to calculate the predicated water quality distributions, which were used in the established hierarchical assessment system for lake water quality risk. The important factors affecting the lake water quality risk were defined using linear regression analysis. The results indicated that the variations in the landscape lake receiving recharge water quality caused considerable landscape lake water quality risk in the surrounding area. Moreover, the Chl a concentration in lake water was significantly affected by TP and TN concentrations; the lake TP concentration was the limiting factor for growth of plankton in lake water. The lake water TN concentration provided the basic nutritional requirements. Lastly, lower TN and TP concentrations in the receiving recharge water caused increased lake water quality risk.
    No preview · Article · Jan 2015 · Environmental Monitoring and Assessment
  • Wu Qing · Wang Xue-fei · Li Yun · Zhao Hua-bing · Sen Peng
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    ABSTRACT: Phytoremediation was applied to repair heavy metal-polluted sewage river dredged sediments in a coastal city of China. Six types of plants were used: Zea mays L.,Lolium multiflorum Lam., Medicago sativa L., Brassica junce, Elsholtzia splenden and Festuca arundinacea Scherb. A relationship between the concentration of heavy metal Ni and the bacteria diversity in the rhizosphere sediment was analyzed based on the PCR–DGGE (polymerase chain reaction-denatured gradient gel electrophoresis). The results indicated that the quantities and types of microorganism in the rhizosphere sediments differed depending on the type of plant. In three types of plants, the phytoremediation efficiency was highest midway through planting, while the repair effect was highest at harvest time for the other three types of plants. The repair effect order of the former three types of plants was Zea mays L.> Lolium multiflorum Lam.> Festuca arundinacea Scherb, and the repair effect order of the other three types of plants was Brassica junce> Medicago sativa L.> Elsholtzia splenden. The bacteria community structure of Zea mays L. changes faster than that of the other plants and stabilizes faster when adapted to the rhizosphere environment. Based on the repair effect and the repair time, Zea mays L. is the best plant for Ni phytoremediation. During the growth of plants, the change in the DGGE fingerprint of the bacteria diversity in different periods is similar to the change in the concentration of Ni in the rhizosphere soil. The dominant types of rhizosphere bacteria are plant- and growth period-specific. The Shannon index of the same plant for different growth periods was calculated, and the results indicated that the diversity index changes with the repair process.
    No preview · Article · Dec 2014 · Ecological Engineering
  • Weina Su · Yimei Tian · Sen Peng
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    ABSTRACT: In this paper, we investigated the influence of sodium hypochlorite (NaClO) biocide on the corrosion of carbon steel in four different conditions during one dosing cycle. The results from the polarisation curve and electrochemical impedance spectroscopy (EIS) indicated that NaClO could affect the activity of microorganisms, leading to corrosion inhibition. The equivalent circuits had two time constants in the presence of biocide, which suggested that an oxide layer of NaClO was formed on the carbon steel surface. Environmental scanning electron microscopy (ESEM) and energy dispersive spectroscopy (EDS) were both employed to demonstrate that NaClO produced a good antibacterial activity, thereby indirectly retarding corrosion while simultaneously inhibiting scaling.
    No preview · Article · Oct 2014 · Applied Surface Science
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    ABSTRACT: This paper investigates the water quality characteristics of rainwater runoff from dual-substrate-layer green roofs in Tianjin, China. The data were collected from four different assemblies and three types of simulated rains. The storm-water runoff quality was monitored from early June through late October 2012 and from July through late November 2013. The results revealed that the runoff water quality would be improved to some extent with the ageing of green roofs and that the quality retention rate better reflected the pollutant retention capacity of the green roof than the pollutant concentration in the runoff water. The investigation clearly demonstrated that green roofs also effectively reduced the chemical oxygen demand and turbidity value and neutralised acid rain to stabilise the pH of the runoff.
    No preview · Article · Oct 2014 · Water Science & Technology