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Environmental risk is ascribed to contamination level as well as the potential decontamination capability of the contaminated sites. In some cases, natural attenuation by biodegradation may dominate self cleanup as microorganisms always try to survive, which reduces risk to human health. Conventional assessment is based on sequential monitoring of concentrations, which requires a large number of samples...
In the present study we reported the feasibility of extracellular biopolymer (PF-9) produced by Pseudomonas fluorescence C-9 as an alternative biosorbent to remove Pb(II) metallic ions from environmental and industrial wastewater.The ability of PF-9 to remove the metallic ions was investigated by using batch biosorption procedure. The effects such as, pH, biosorbent dosage, sorbate concentrations...
An algicidal bacterium was isolated from Lake Taihu during the bloom of Microcystis in 2009. It was Gram-negative, oxidase-negative, and produced red-colored colonies on agar media. The strain was tentatively identified as Serratia marcescens by means of physiological, biochemical reactions and homology analysis based on 16S rDNA. The bacteria could degrade Microcystis aeruginosa effectively. When...
Endocrine disrupters (EDCs) have caused great concerns for the safety of water environment and drinking water in recent years. This paper uses lab-cultured human breast cancer cells (MCF-7) to examine the changes of water estrogenicity during the drinking water treatment process and uses chemical analysis as supplementary information. The results showed that MCF-7 were extremely sensitive to the aqueous...
Drinking waters worldwide have experienced an increase in the occurrence of harmful algal blooms. Nutrients variance is hypothesised to be the main factor that causes algae populations outbreaks. The effects of trace nutrients and their interaction on the proliferation of planktonic algae colony, is one of the most complex factor in the formation process of algae blooms, and in addition the factor...
Diatom Ditylum brightwelli (West) Grunow was cultivated for 5 days, under the environment of low silicon concentration (6 mg/L), high silicon concentration (150 mg/L) and normal silicon concentration (30 mg/L, control ) respectively. Then the plasma membrane of the diatom was extracted and purified by two-phase method. After the analysis of the Na+/K+-ATPase, Ca2+/Mg2+-ATPase and total ATPase activities...
The effect of an improved membrane bioreactor (IMBR) on COD, NH3-N and TN removal and membrane fouling alleviating was investigated through a comparative study with a traditional submerged membrane bioreactor (SMBR). The variations of trans-membrane pressure (TMP), concentration of mixed liquid suspend sludge (MLSS) and extracellular polymeric substance (EPS) was also conducted through the long-term...
In this paper, a novel method is developed to predict the effect of estrogen on human living cells. This method is based on dynamic measurements coupled with a Michaelis-Menten type of mathematical modeling and parameter estimation procedure. The novelty of this method is the use of dynamic measurements generated by a real-time cell electronic sensor (RT-CES) system and the development of a mathematical...
Impact on liver tissue of Carassius auratus by 0.5 mg/L-1 cadmium with additional 0.25, 0.5 and 1.0 mg/L-1 lanthanum was measured by ROS content, MDA content and Fourier Transform infrared spectrum analysis. The results showed 0.5 and 1.0 mg/L-1 lanthanum could alleviate cadmium stress by eliminate excessive ROS and MDA within 1-3 days, and 1.0 mg/L-1 lanthanum could decrease these two value to nearly...
Microbial community compositions and functional activities of three acid mine drainage (AMD) sediment samples from different sites in Dexing copper mine were analyzed by 50- mer oligonucleotide arrays which have been constructed and evaluated. The results showed that microbial community was composed of 15 different genus or species, including Acidithiobacillus ferrooxidans(A. ferrooxidans), Leptospirillum...
Microbial flocculants is a kind of metabolic products with flocculating activity being produced by microbes and secreted outside of cells, which is provided with characteristics as well as high-performance, non-toxic, no secondary pollution, being widely applied in the field of water treatment. Through summarizing the relevant domestic and overseas research literatures published in the recent years,...
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