bacteria testing Articles

  • A theory of the lifecycle of bacteria

    Aims: The principal objective of this study was to investigate viability kinetics in aerobic AS (Activated Sludge). Methods and Results: A kinetic model was developed in order to predict viable cells, non-degraded dead cells and inert VSS (Volatile Suspended Solids) in a reactor – usually conventional models only predict active biomass and inert VSS. The following processes were considered in ...


  • Controlling Bacteria In a Clean Room Environment

    Maintaining the integrity of a cleanroom is a constant battle. The first step to deciding which method, or combination of methods, to employ is to identify the prime sources of contamination. There are three prime sources of contamination through which the integrity of a cleanroom might be breached. First, there is the human element. While many processes might be automated, many situations remain ...


    By GVS Filter Technology

  • Antibiotic resistance among autochthonous aquatic environmental bacteria

    Antibiotics are widely used in both human and veterinary medicine and antibiotic-resistant bacteria cause problems in antibiotic therapy. The current study was conducted in the catchment area of the river Swist (Germany) and focuses on the resistance of environmental Rhodospirillaceae to antibiotics used in human medicine. The samples collected reflect different levels of human impact on the ...


    By IWA Publishing

  • Effect of daylight on regrowth of bacteria in anaerobically digested sludge

    This study investigated the regrowth of total coliform, Salmonella, and Clostridium perfringens in anaerobically digested sludge after centrifuge dewatering in the presence and absence of daylight. Sludge cake and centrate samples were collected from a treatment plant, and half of the samples was stored in daylight and the other half was stored in dark for three weeks. The ...


    By IWA Publishing

  • Baby teethers may contain dangerous bacteria

    According to a FDA report released last month children are at risk from some gel-filled teethers that may contain Bacillus subtilis and Bacillus circulans bacteria. Following the report a major manufacturer of teethers issued a recall on their gel-filled teethers and has ceased production and distribution of the products.The FDA release stated that “Although these bacteria generally do not cause ...


  • Adapter bacteria control oil spill in bulk

    Introduction Microbac was called in to advise on a required treatment for an integrated bulk oil handling facility and sea-land terminal, receiving, storing and shipping a wide variety of liquid fuels, inorganic chemicals and petrochemicals, many of which are toxic to microorganisms. The variable and complex waste streams from tank truck cleaning, ballast and tank cleaning discharges from ...


    By Microbac Ltd

  • Best Steam Cleaner for Complete Bacteria Elimination

    The best steam cleaner for commercial applications have three functions: Removing dirt and stains Removing allergens Eliminating germs and pests Dirt Removal Mud spots, sugars, food residue, and stains can be removed more completely by using the best steam cleaner systems, with high temperature and pressure levels. Ideally, the best steam ...


    By Daimer Industries Inc.

  • Overcoming iron bacteria problems: An Australian perspective

    Iron bacteria are becoming an increasing problem in groundwater bores and are estimated to affect about 40% of the world’s water bores with anecdotal evidence indicating that this number is steadily increasing. Iron bacteria derive energy during their metabolism through oxidising soluble ferrous iron, present in the groundwater, to its insoluble ferric form. The resultant biofilm is ...


    By Geoquip Water Solutions

  • An Evaluation of the Effectiveness of the Gunderboom® in Protecting Waters from Bacteria

    Beaches located in the narrow inlet of Long Island Sound frequently contain high concentrations of bacteria. A Gunderboom® BPS™ (Beach Protection System) filter was installed in Harbor Island Park of Mamaroneck Harbor, New York, in 2002 to reduce bacterial levels in the water. Water and sediment collected inside and outside the Gunderboom® and other areas within Mamaroneck Harbor (Shore Acres ...

  • Multiplex PCR for detection of water-borne bacteria

    Microbial water-borne diseases still affect developing countries and are major water quality concerns throughout the world. Routine culture-based methods of identifying bacterial pathogens in water sources are laborious and time-consuming. Recently, the use of molecular techniques such as the polymerase chain reaction (PCR) has provided rapid and highly promising detection methods. In this ...


    By IWA Publishing

  • Detection of DNA sequences of bacteria using a direct electrochemi-luminescence method

    Real-time detection of microbiological contamination in water is a challenging issue in comparison to the state-of-the-art re-quired minimum test-duration of 48 to 72 hours. Pathogen bac-teria in drinking water, like Escherichia Coli, can be detected by identification of their DNA. First, the specific sequences of the DNA have to be selected by hybridization with a corre-sponding probe. The ...


  • IAQ investigators often overlook Bacteria as the Root Cause of Occupant Complaints

    Untitled Document Many investigators have been dealing with mold issues the last few years and may have been overlooking bacteria as the underlying microbial problem. Bacteria ...


    By EMSL Analytical, Inc.

  • Sulphate reducing bacteria to precipitate mercury after electrokinetic soil remediation

    Combined treatment with electroremediation and sulphate reducing bacteria (SRB) was tested in laboratory and pilot scale. The contaminated soil came from a chlor-alkali factory and contained about 100 mg/kg Hg. Iodide/iodine complexing agent was used to mobilize mercury. Mercury iodide complexes were moved to the anode solution using an electric field. The anode solution was then mixed with ...

  • Evaluation of the UV disinfection process in bacteria and amphizoic amoebae inactivation

    Abstract: Every year around 3.4 million people die from water-related diseases, mainly amoebiasis and diarrhoea caused by bacteria. The assessment of the efficiency of a UV light disinfection process in the inactivation of indicators, pathogen bacteria and amphizoic amoebae in a secondary treated effluent was carried out. Wastewater was irradiated with different doses of UV light using a ...

  • Biodegradation of Anionic Surfactants by Isolated Bacteria from Activated Sludge

    Sodium dodecyl sulphate, (SDS) is an anionic surfactant that widely used all over the world. They will eventually end-up and accumulate in household or industrial sewage. Due to their high foaming capabilities, which can cause numerous problems in sewage treatment facilities as well as direct toxic effects on many different organisms in ecosystem; they are generally considered as serious ...

  • Micro-zooplankton grazing as a means of fecal bacteria removal in stormwater BMPs

    A priority for environmental managers is control of stormwater runoff pollution, especially fecal microbial pollution. This research was designed to determine if fecal bacterial grazing by micro-zooplankton is a significant control on fecal bacteria in aquatic best management practices (BMPs); if grazing differs between a wet detention pond and a constructed wetland; and if environmental ...


    By IWA Publishing

  • Cyanobacteria and bacteria co-occurrence in a wastewater treatment plant: absence of allelopathic effects

    Fifty-one cyanobacteria strains, belonging to Phormidium autumnale, Planktothrix mougeotii, Limnotrix sp. and Synechocystis sp. species, were isolated during a twelve months period, from a Wastewater Treatment Plant (WWTP) located in the north of Portugal. Isolated strains and environmental samples were analyzed by Polymerase Chain Reaction (PCR) ...


    By IWA Publishing

  • Disease-causing bacteria made more resilient by standard water disinfection practices

    Halogenated nitrogenous disinfection by-products (N-DBPs) in water increase bacterial resistance to antibiotics, new research shows. The study found that a strain of bacteria which can cause disease in humans, Pseudomonas aeruginosa, increased its resistance to a range of different antibiotics by an average of 5.5 times after the bacteria were exposed to chemicals which form as by-products of ...

  • Impacts of silver nanoparticles on cellular and transcriptional activity of nitrogen‐cycling bacteria

    The widespread use of silver nanoparticles (AgNPs) raises the potential for environmental releases that could impact microbial ecosystem services. In the present study, the authors address how the AgNPs and Ag+ that they release may impact nitrogen‐cycling bacteria. The authors studied the cellular and transcriptional response of the denitrifier Pseudomonas stutzeri, the nitrogen fixer ...


    By John Wiley & Sons, Ltd.

  • Potentially pathogenic bacteria isolated from different tropical waters in Sri Lanka

    This study investigated the bacteriological contamination of different water sources in Sri Lanka. Source waters (n = 74) including bottled water, well water and surface water were assessed for enumerating total coliforms and faecal coliforms using the membrane filtration method. The results showed that 18.5 and 14.8% of bottled water samples were contaminated with total ...


    By IWA Publishing

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