wastewater treatment Articles
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A practitioner’s perspective on the uses and future developments for wastewater treatment modelling
The modern age of wastewater treatment modelling began with publication of the International Water Association (IWA) Activated Sludge Model (ASM) No.1 and has advanced significantly since. Models are schematic representations of systems that are useful for analysis to support decision-making. The most appropriate model for a particular application often incorporates only those components ...
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Removal improvement of bacteria (
Escherichia coli and enterococci) in maturation ponds using bafflesKorba wastewater treatment plant is a conventional activated sludge followed by three maturation ponds (MP1, MP2, MP3) in series acting as a tertiary treatment. The first study of wastewater treatment plants showed that the effluent concentration of Escherichia coli and enterococci at the outlet of the (MP3) varies between 103 and 104CFU/100 ml. After the hydrodynamic study conducted by Rhodamine ...
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Effect of triclosan on protozoa in wastewater treating bioreactors
The effect of antimicrobial chemical, triclosan (TCS) on protozoa present in aerobic and anaerobic bioreactors for wastewater treatment is reported in this study. Bioreactor sludge ciliated protozoa such as Spirostomum, Cyclidium and Colpoda and flagellated protozoa Mastigella were exposed to TCS at 1 mg/L level in batch cultures. The response of TCS on protozoa was followed by microscopic ...
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Removal and relationships of microbial indicators in a water treatment and reclamation facility
A wastewater treatment and reclamation facility in north-east Spain was monitored over 1 year to determine the occurrence and concentrations of different microbial indicators (Escherichia coli, fecal enterococci, somatic bacteriophages and spores of sulfite-reducing clostridia). The removal of the indicators and its relationships through the wastewater treatment and reclamation trains were ...
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Wastewater Monitoring Series, Part 2: The Use of 2nd Generation ATP Monitoring Systems
In October, we featured Part I of a three-part series on "Getting a Handle on Living Biomass in Wastewater Treatment." Here, we present Part II of the series which focuses on a revolutionary breakthrough technology that uses Adenosine Triphosphate (ATP) for the measurement of total microbiological content in a given sample. Through years of successful research, development, and field ...
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Long-term effects of engineered nanoparticles on enzyme activity and functional bacteria in wastewater treatment plants
The pervasive use of engineered nanoparticles (NPs) in a wide range of fields raises concerns about their potential environmental impacts. Previous studies confirmed that some NPs had already entered wastewater treatment plants (WWTPs). Wastewater nutrient removal depends on the metabolisms of activated sludge bacteria and their related key enzymes. Therefore, this study compared the possible ...
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Applications for UF Filtration Technology in Water & Wastewater
Water treatment technology is and can be applied to different municipalities, industries, and commercial businesses, each with their own specific water treatment needs. For this reason, it is beneficial to have technologies on hand that are versatile based on the treatment application. For instance, filters are used in almost every water/wastewater treatment application in either pretreatment or ...
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The biological basis of wastewater treatment
Introduction This booklet was written to fulfil the need for a simple explanation of the biological processes that underpin wastewater treatment. It attempts to show how the bacteria involved deal with the organic carbon in the sewage. Remarkably, there are just 3 major processes involved, and these mirror exactly the 3 major processes at work in the plant viz: biodegradation, oxygen removal ...
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Identification of pathogen bacteria and protozoa in treated urban wastewaters discharged in the Ebro River (Spain): water reuse possibilities
The aim of this research work is to identify the presence of pathogens, bacteria and protozoa, in different treated urban wastewaters and to relate biological pollution with the processes used in wastewater treatment plants. A study of the possibilities for water reuse is carried out taking into account bacterial and parasite composition. The analysed bacteria and protozoa are: Enterococcus ...
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The Resilience of Biofilms
These elegant formations of microbes enable robust wastewater treatment Some of Fluence’s signature wastewater treatment solutions are based on membrane aerated biofilm reactor (MABR) technology, which was first introduced in the 1990s. MABR harnesses biofilm, an extremely resilient mode of life that has been found in sediment dating back 3.4 billion years. These formations of microbial ...
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Monitoring and evaluation of removal of pathogens at municipal wastewater treatment plants
The concentrations and removal of Cryptosporidium, Giardia, and microbial indicators, including somatic coliphages and fecal coliforms were investigated through the wastewater treatment processes at three municipal wastewater treatment plants in Beijing, China. The experimental results showed that the concentrations of Cryptosporidium in untreated wastewater, primary treatment effluent, secondary ...
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Determining potential indicators of
Cryptosporidium oocysts throughout the wastewater treatment processMost research on wastewater treatment efficiency compliance focuses on physicochemical and microbial indicators; however, very little emphasis has been placed so far on determining suitable indicator organisms to predict the discharge level of pathogens from treatment plants. In this study, raw wastewater, activated sludge, and the resulting final effluents and biosolids in four municipal ...
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Biosorption of Pb(II) from synthetic wastewater onto Pseudomonas aeruginosa
The biosorption property onto Pseudomonas aeruginosa was represented by the Langmuir isotherm, and the maximum capacity of Pb(II) was 45 mg g−1 dry weight of bacteria at pH 5. The biosorption capacity of Pb(II) in a binary system increased with increasing Pb(II) concentration, from 0 to 50 mg l−1 in which Cr(III) existed at a constant concentration of 50 mg l−1. This result indicates that there ...
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Bacterial diversity in antibiotic wastewater treatment
The bacterial diversity of an antibiotic industrial wastewater treatment system was analyzed to provide the information required for further optimization of this process and for identification of bacterial strains that perform improved degradation of antibiotic industrial wastewater. The total bacterial DNA of samples collected at three stages (aeration, precipitation, and idle) during the ...
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How changes in F/M impact microbial populations
Did you know that microbial populations in wastewater are constantly changing? F/M or influent organic makeup and concentrations are a major influence as to what microbes are present. Other factors influencing microbial populations include temperature, pH, D.O., inhibitory compounds, and macronutrients. An underused tool in wastewater treatment is to check your system against the growth curve. A ...
By Aster Bio
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Anaerobic MBR process monitoring - ADI Systems Case Study
SENTRY-AD bio-electrode sensor (BES) that monitors the microbial metabolic activity of exoelectrogenic bacteria and can be used in anaerobic digestion wastewater treatment processes. The data collected aids operators ...
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Anaerobic MBR process monitoring - ADI Systems - Case Study
SENTRY-AD bio-electrode sensor (BES) that monitors the microbial metabolic activity of exoelectrogenic bacteria and can be used in anaerobic digestion wastewater treatment processes. The data collected aids operators ...
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Occurrence and enrichment of ‘bacterial sherpas’: climb to sustainability in wastewater treatment
The paper presents research on hemoglobin (Hb)-expressing bacteria in biological wastewater treatment systems. The outcome(s) will greatly reduce the aeration needs of wastewater treatment plants (WWTPs) and provide insight into emerging biological nitrogen removal processes using low dissolved oxygen (DO) conditions. In anthropogenic terms, the bacteria that express Hb could be considered as ...
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FRAC Operations Treatability Report Wastewater Treatment Case Study
Impressive Oil Water Separation Scenario The water sample from a CUDD Energy oil field site was treated for solids reduction, BOD reduction, metals and dissolved metals. Conclusion The treatability shows the high removal rate for heavy metals, minimal increase in EC/TDS as shown in the anions/cations and high removal of particulate solids in the form of suspended solids. Increases are shown as ...
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A new disinfection system for wastewater treatment: performic acid full-scale trial evaluations
To evaluate the efficiency and effect of a new disinfection technology in wastewater treatment, batch and full-scale experiments were performed between winter 2005 and summer 2011. The system, developed by Kemira Oyj, produces a disinfection solution containing performic acid (PFA) by mixing hydrogen peroxide and formic acid. A preliminary study in batch reactors established the suitability for ...
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