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Pei H.,Shandong University | Pei H.,Research Center on Environmental Science and Engineering | Liu Q.,Shandong University | Hu W.,Research Center on Environmental Science and Engineering | Xie J.,Shandong Environmental Monitoring Central Station
International Journal of Environmental Research | Year: 2011

This study was carried out from June to October 2008 in Nansi Lake. Based on the data collected from five sampling stations, phytoplankton taxonomic composition, abundance, temporal variations and spatial distribution were examined. About 94 species, including 48 species of Chlorophyta, 22 species of Bacillariophyta, and 1 water bloom causative species were identified. Average phytoplankton diversity index and evenness values were 1.59 and 0.58, respectively, revealing moderate biodiversity of phytoplankton biocoenosis. The phytoplankton abundance averaged 1.52×10 7 cells/L, and was much higher than previous investigation carried out in the same months in 1995. The species of Chlorophyta, Bacillariophyta dominated phytoplankton community. The main dominant species were Scenedesmus dimorphus, Chlorella vulgaris, Synedra acus, Aulacoseira granulata, Merismopedia tenuissima and Monallantus brevicylindrus. Concerning nutrient stoichiometry, it was suggested that the higher TN: TP ratio indicated potential P-limitation for phytoplankton growth in Nansi Lake. The environmental conditions of water quality and phytoplankton community composition indicated that Nansi Lake was eutrophic in summer. Source


Sun F.,Shandong University | Pei H.-Y.,Shandong University | Pei H.-Y.,Research Center on Environmental Science and Engineering | Hu W.-R.,Shandong University | And 2 more authors.
Environmental Technology (United Kingdom) | Year: 2012

A pronounced dominance of toxic cyanobacteria has been found in eutrophic water bodies, with Microcystis being a common species. Although toxic cyanobacteria are commonly described worldwide, few recent papers on the sensitive and effective quantification of cyanobacteria have been published. In this paper, a multi-technique approach was applied by the use of cell density counting, cell viability testing, chlorophyll a determination, microcystin monitoring and gene extraction techniques to quantitatively analyse the cyanobacterial biomass of Microcystis aeruginosa FACHB-905. The entire dataset was used to examine the relationships between these indices. Results showed that, for 107 viable cells in the experimental conditions, the contents of chlorophyll a, microcystin-LR and total genes (16S rDNA) averaged 2.65 μg, 0.61 μg and 0.79 μg, respectively. For different cell viability proportions in the same particular phase of growth, it is easy to obtain the respective amount of viable cells and inactive cells and their measurable indices when any one of the three indices, chlorophyll a, DNA or microcystin-LR, is measured. This study provides a new perspective and method for determining multiple indices of toxic cyanobacteria during the same conditions and phases. © 2012 Copyright Taylor and Francis Group, LLC. Source


Tian C.,Shandong University | Lu X.,Shandong University | Pei H.,Shandong University | Hu W.,Research Center on Environmental Science and Engineering | Xie J.,Shandong Environmental Monitoring Central Station
Environmental Monitoring and Assessment | Year: 2013

Dongping Lake is the final adjusting and storing lake in the east route of the South-to-North Water Diversion Project in China, and there has been serious concern regarding the water quality. Understanding the process of phytoplankton variation can be particularly useful in water quality improvement and management decisions. In this study, the phytoplankton taxonomic composition, abundance, temporal variations, spatial distribution, and diversity were studied based on a monthly sampling campaign from three sampling stations between May 2010 and May 2011. A total of 132 species (8 phyla, 72 genera), including 64 species of Chlorophyta, 26 species of Bacillariophyta, 21 species of Cyanophyta, 12 species of Euglenophyta, 3 species of Cryptophyta, 2 species of Xanthophyta, 1 species of Pyrrophyta, and 3 species of Chrysophyta were identified. Average phytoplankton diversity index and evenness values were 3.83 and 0.77, respectively, revealing a high biodiversity of phytoplankton community. The phytoplankton abundance averaged 5.11 × 106 cells/L, with Bacillariophyta dominant in winter and spring, but Cyanophyta in summer and autumn. There were 14 predominant species including Pseudanabaena limnetica, Chlamydomonas simplex, Cyclotella stelligera, and Chroomonas acuta. Phytoplankton community structure and water quality variables changed substantially over the survey period; redundancy analysis, Pearson correlations, and regression analysis as an integrated approach were applied to analyze the relationships among them. Total phosphorus and ammonium played governing roles in the phytoplankton dynamics of Dongping Lake during all periods investigated. © 2012 Springer Science+Business Media B.V. Source


Sun F.,Shandong University | Pei H.-Y.,Shandong University | Pei H.-Y.,Research Center on Environmental Science and Engineering | Hu W.-R.,Shandong University | And 2 more authors.
Chemical Engineering Journal | Year: 2012

The membrane integrity of cells is significant for the safe and effective removal of cyanobacterial cells from drinking water sources. In this paper, cell density counting, cell viability testing, chlorophyll-a determination, extracellular MC-LR monitoring and PCR-DGGE analysis were applied to assess the effects of coagulant dose, shear and floc storage time on the integrity of Microcystis aeruginosa FACHB-905. Results showed that all cells were removed without damage to membrane integrity under the optimum coagulation conditions: coagulant dose 15mg/L AlCl 3, rapid mix speed 250r/min, rapid mix time 1min, slow mix speed 20r/min, slow mix time 20min. The coagulant dose and shear did not cause the lysis of cells and ensuing release of MC-LR. But when the flocs were stacked over 6days, the cells lysed and the MC-LR concentration increased above the background level. In addition, the degree of cell breakage without coagulation was higher than the coagulated cells in flocs. Therefore, keeping the flocs safely treated or disposed of on time as well as keeping the cyanobacterial cells integrally removed plays an important part in controlling the harm of blooms to drinking water production. © 2012 Elsevier B.V. Source

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