activated sludge Articles
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Lumpur Aktif (Activated Sludge)
Lumpur aktif (activated sludge) merupakan campuran cair atau semicair dan partikel endapan lumpur dan tanah liat salah satu proses pengolahan air limbah secara biologi, proses pertumbuhan organisme yang berukuran sangat kecil yang biasa disebut mikroba tersuspensi dimana proses tersebut pada dasarnya merupakan pengolahan aerobik yang mengoksidasi material organik menjadi CO2 dan H2O, NH4. dan sel ...
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Ammonium removal by native microbes and activated sludge within the Jialu River basin and the associated microbial community structures
To explore the availability of native microbes and activated sludge for ammonium removal, the native microbes and activated sludge in Jialu River basin were investigated in terms of ammonium-removing activities and their microbial communities using spectrophotometry and high-throughput sequencing. NH4+-N and total nitrogen (TN) in the targeted river ranged from 2.45 ± 1.76 to 8.56 ± 2.54 mg/L ...
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Eufaula, AL - Case Study
Activated Sludge Basin March, 2005: Vertical Units in two Activated Sludge Basins replaced with S&N Airoflo 20 HP Floating Brush Rotors (NOTE: This basin is 12' deep) As a result, HP used was reduced from 330 to 240. Cycling units between October - April. Energy consumption reduced by 48%. ...
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Microbial Population Structures in Activated Sludge Before and After the Application of Synthetic Polymer
Since Juang (2005) has found that the sludge settleability became much worse and the flocs displayed as pin flocs in only a few days after the addition of synthetic polymer was halted, it is hypothesized that the shift of microbial population in activated sludge before and after the addition of synthetic polymer might have occurred. Therefore, the identification of microbial population in the ...
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Study of kinetics of degradation of cyclohexane carboxylic acid by acclimated activated sludge
Activated sludge contains complex microorganisms, which are highly effective biodegrading agents. In this study, the kinetics of biodegradation of cyclohexane carboxylic acid (CHCA) by an acclimated aerobic activated sludge were investigated. The results showed that after 180 days of acclimation, the activated sludge could steadily degrade >90% of the CHCA in 120 h. The degradation of CHCA ...
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Sanlexicon: A - B
Activated sludge Production of an activated mass of micro-organisms capable of stabilizing waste aerobically. Continue reading the full article ...
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Guidelines for using activated sludge models
Mathematical modelling of activated sludge systems is used widely for plant design, optimisation, training, controller design and research. The quality of simulation studies varies depending on the project objectives, finances and expertise available. Consideration has to be given to the model accuracy and the amount of time required carrying out a simulation study to produce the desired ...
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Effect of synthetic cationic surfactants on dewaterability and settleability of activated sludge
Dimeric cationic surfactants with different lengths of carbon chains were synthesised, and then these surfactants were added to the activated sludge samples to evaluate the dewaterability and settleability. The adsorbability of cationic surfactants on activated sludge was also studied. By comparing the dewatering performances of different cationic surfactants, the effect mechanisms of cationic ...
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Activated sludge modelling in practice - An international survey
Abstract: The Good Modelling Practice Task Group (GMP-TG) of the International Water Association (IWA) is developing guidelines for the use of Activated Sludge Models (ASM). As part of this work the group created and sent out a questionnaire to current and potential activated sludge model users in 2007. The objectives of the questionnaire were (i) to better define the profile of ASM users, (ii) ...
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Valuation of OSA process and folic acid addition as excess sludge minimization alternatives applied in the activated sludge process
The aim of this study was to investigate the ability of the oxic-settling-anaerobic (OSA)-process and the folic acid addition applied in the activated sludge process to reduce the excess sludge production. The study was monitored during two distinct periods: activated sludge system with OSA-process, and activated sludge system with folic acid addition. The observed sludge yields (Yobs) were ...
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Biosorption and biodegradation of trichloroethylene by acclimated activated sludge
The biosorprion and biodegradation of trichloroethylene (TCE) was investigated. The experimental results showed that at 25°C the adsorption equilibrium of TCE at concentrations from 10 mg/L to 200 mg/L could be described by the Freundlich isotherm. Adsorption could complete within 15 min. Results indicated that glucose could serve as a co-substrate and enhance TCE biodegradation through ...
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Real-time PCR quantification of ammonia-oxidising bacteria in aerobic granular sludge and activated sludge influenced by pentachlorophenol
An improved real-time PCR was developed to quantify Ammonia-Oxidising Bacteria (AOB) in aerobic granular sludge and activated sludge influenced by Pentachlorophenol (PCP), which ranged from 0 mg/L to 50 mg/L. With the increase of PCP concentration, there is no obvious variation of AOB quantification (p > 0.05) and COD removal rate in both types of sludge. However, the ammonia nitrogen removal of ...
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Metagenomic screening for bleomycin resistance genes {triangledown}
A metagenomic library of activated sludge was screened for bleomycin resistance genes. Two genes were identified that differed greatly from each other, from the genes of bleomycin-producing actinomycetes, and from those of clinical isolates. Therefore, the nonclinical environment is a rich reservoir of new resistance elements, and metagenomics can be used to sample the resistome rapidly. ...
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Activated sludge modelling: development and potential use of a practical applications database. Water Science & Technology
Abstract: This study aims at synthesizing experiences in the practical application of ASM type models. The information is made easily accessible to model users by creating a database of modelling projects. This database includes answers to a questionnaire that was sent out to model users in 2008 to provide inputs for a Scientific and Technical Report of the IWA Task Group on Good Modelling ...
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Activated sludge modelling: development and potential use of a practical applications database
This study aims at synthesizing experiences in the practical application of ASM type models. The information is made easily accessible to model users by creating a database of modelling projects. This database includes answers to a questionnaire that was sent out to model users in 2008 to provide inputs for a Scientific and Technical Report of the IWA Task Group on Good Modelling Practice – ...
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Activated sludge modelling in practice - An international survey
Abstract: The Good Modelling Practice Task Group (GMP-TG) of the International Water Association (IWA) is developing guidelines for the use of Activated Sludge Models (ASM). As part of this work the group created and sent out a questionnaire to current and potential activated sludge model users in 2007. The objectives of the questionnaire were (i) to better define the profile of ASM users, (ii) ...
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Rethinking wastewater characterisation methods for activated sludge systems – a position paper
Increasingly stringent effluent limits and an expanding scope of model system boundaries beyond activated sludge has led to new modelling objectives and consequently to new and often more detailed modelling concepts. Nearly three decades after the publication of Activated Sludge Model No1 (ASM1), the authors believe it is time to re-evaluate wastewater characterisation procedures and targets. ...
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The use of rotifers for limiting filamentous bacteria Type 021N, a bacteria causing activated sludge bulking
The excessive growth of filamentous bacteria and the resultant bulking of activated sludge constitute a serious problem in numerous wastewater treatment plants. Lecane inermis rotifers were previously shown to be capable of reducing the abundance of Microthrix parvicella and Nostocoida limicola in activated sludge. In the present study, the effectiveness of four Lecane clones in reducing the ...
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Revamp of 100 KLD STP at EROS Hotels - Case Study
Transchip3.0 High Performance High Surface Area MBBR Media Installation at – EROS Hotel STP, Delhi Influent Parameters Flow - 100 KLD Bod – 700 ppm Cod – 2000 ppm Previous treatment : Activated Sludge ...
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Effect of microalgae inoculation on the start-up of microalgae–bacteria systems treating municipal, piggery and digestate wastewaters
The effect of the inoculation of a microalgae–bacteria system on the removal of nutrients and organic matter using municipal, piggery and digestate wastewaters was evaluated. Three conditions for each substrate were evaluated: (1) inoculation with activated sludge and illumination, (2) inoculation with activated sludge without illumination, and (3) inoculation with activated sludge plus a ...
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