Activated Sludge Monitor Articles on Environmental XPRT

N-Tox® prevents activated sludge failure and monitors greenhouse gas emissions

A new technique for evaluating nitrification efficiency in industrial and municipal activated sludge systems is described that uses direct measurement of dinitrogen oxide, an important greenhouse gas, as an indicator of nitrification failure. Developed at Water Innovate, N-Tox® helps control ammonia levels in treated effluent by providing an early warning of wastewater treatment failure. The ...

Feb. 1, 2006

By Clarity Authoring

Continuous on-line monitoring of dissolved oxygen in the activated sludge of a sewage treatment plant

Dissolved oxygen is traditionally measured using a Clark cell, which relies upon a gas-permeable membrane for its opera-tion. Such sensors are subject to fouling with subsequent loss of accuracy, making frequent maintenance and calibration necessary. The objective of this development was to take advantage of specific properties of microelectrode arrays, such as low flow-dependence, insensitivity ...

Jan. 1, 2002

Complete solids retention activated sludge process

In a slaughterhouse's full-scale extended aeration activated sludge wastewater treatment plant (WWTP), operating under complete solids retention time, the evolution of mixed liquor suspended solids (MLSS) and mixed liquor volatile suspended solids (MLVSS) concentration, food to micro-organisms ratio (F/M) and substrate utilization rate (SUR) were studied for over a year. Biomass growth phases ...

Dec. 1, 2015

By IWA Publishing

Pollutant monitoring in sludge treatment wetlands

Phragmites australis for sludge dewatering and stabilization processes have been widely proved. The presence of reeds, indeed, efficiently allows solids dewatering and organic matter stabilization in order to obtain a stabilised product that can be suitable for land application, even if its environmental impact has to be considered. The actual revision of the European Union's Working Document on ...

Jan. 1, 2011

By IWA Publishing

In situ microscopy as a tool for the monitoring of filamentous bacteria: a case study in an industrial activated sludge system dominated by M. parvicella

The present study demonstrates the application of in situ microscopy for monitoring the growth of filamentous bacteria which can induce disturbances in an industrial activated sludge process. An in situ microscope (ISM) is immersed directly into samples of activated sludge with Microthrix parvicella as dominating species. Without needing further preparatory ...

Dec. 1, 2015

By IWA Publishing

Activated sludge optimization using ATP in pulp and paper industry

The activated sludge process is an old technology, but still the most commonly used one for treatment of wastewater. Despite the wide spread usage the technology still suffers from instability (Tandoi et al. 2006) and high operating cost. Activated sludge processes often carry a large solids inventory. Managing the total inventory without interference is the key component of the optimization ...

Apr. 27, 2015

By IWA Publishing

Evaluation of extracellular biopolymer and its impact on bioflocculation in activated sludge bioreactors

The influence and dynamics of bacterial extracellular polysaccharide (EPS) polymer production and its impact on bioflocculation in activated sludge (AS) bench-scale reactors were investigated. The impact of food to microorganism ratio (F/M), reactor configuration and easily biodegradable carbohydrates in influent streams on biological processes that support or weaken good floc formation and the ...

Feb. 1, 2011

By IWA Publishing

Towards energy neutrality by optimising the activated sludge process of the WWTP Bochum-Ölbachtal

As a result of Ruhrverband's regularly performed energy audits the wastewater treatment plant (WWTP) Bochum-Ölbachtal shows substantial deficits concerning energy efficiency. Due to the energy consumption of internal recirculation, mixers and return activated sludge (RAS) pumping the existing pre-denitrification process configuration offers a specific energy consumption for biological ...

Apr. 12, 2016

By IWA Publishing

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 ...

Oct. 26, 2015

By IWA Publishing

Demonstration Of An Integrated Fixed Film Activated Sludge (Ifas) System For Enhanced Nitrification Using A New Free Moving Media

Between October 1995 and June 1998, a study was conducted at the Waterdown STP to evaluate IFAS options for reducing the cost of retrofitting larger plants in the province of Ontario for year-round nitrification. Cord media options were evaluated first, but significant detractors to this approach were encountered such as worm growth and flow short circuiting. As a result, a free-floating plastic ...

Jun. 21, 2007

Rapid quantification of polyhydroxyalkanoates (PHA) concentration in activated sludge with the fluorescent dye Nile blue A

The present study was conducted (1) to develop a rapid quantification method of polyhydroxyalkanoates (PHA) concentration in activated sludge by Nile blue A staining and fluorescence measurement and (2) to perform on-line monitoring of PHA concentrations in activated sludge. Activated sludge samples collected from laboratory scale sequencing batch reactors and full-scale wastewater treatment ...

Jan. 1, 2011

By IWA Publishing

Comparison between hybrid moving bed biofilm reactor and activated sludge system: a pilot plant experiment

The paper presents the comparison between the traditional activated sludge system (AS) and a hybrid moving bed biofilm reactor (HMBBR). In particular, an experimental campaign has been carried out at the WWTP in Palermo (Italy), on a pilot plant consisting of two pre-anoxic schemes. The aerated tank of the HMBBR line was filled with suspended carriers (AnoxKaldnes™ K1), with a 30% filling ratio. ...

Feb. 1, 2010

By IWA Publishing

Understanding the contribution of biofilm in an integrated fixed-film-activated sludge system (IFAS) designed for nitrogen removal

The objective of this study is to improve knowledge on the integrated fixed-film-activated sludge (IFAS) system designed for nitrogen removal. Biofilm growth and its contribution to nitrification were monitored under various operating conditions in a semi-industrial pilot-scale plant. Nitrification rates were observed in biofilms developed on free-floating media and in activated sludge operated ...

May 18, 2015

By IWA Publishing

Technical Focus: Sludge Blanket

Regardless of treatment process, sludge blanket control is an important aspect of any wastewater treatment plant, and correct monitoring and treatment of sludge is paramount for efficiency and cost control. Manual monitoring of sludge blanket levels is an occasional and often rushed method of control and can lead to inaccuracies being compounded over time, potentially leading to overspill into ...

Sep. 17, 2014

By Partech (Electronics) Ltd.

Granularity determination of activated sludge through on-line profiles by means of case-based reasoning

Aerobic granulation from floccular sludge is difficult to detect in first stages with the naked eye. This work proposes a combination of multi-way principal components and case-based reasoning to predict the granulation state of a sequencing batch reactor, based solely on the on-line registered profiles of common sensors (i.e. pH, dissolved oxygen and oxidation-reduction potential). The ...

Feb. 26, 2014

By IWA Publishing

Oxygen Uptake Rate Tests To Evaluate Integrated Fixed Film Activated Sludge Processes

The combination of biofilm and suspended growth processes is, to date, relatively novel and there is a need to develop tools to monitor the performance of IFAS systems. The recent start-up of a full-scale demonstration Integrated Fixed Film Activated Sludge (IFAS) process in Ontario was monitored for approximately 100 days, providing an opportunity to investigate analytical tools to assess ...

Jan. 1, 2005

Comparison of behaviour and fate of tetrabromobisphenol A (TBBPA) in membrane bioreactors and conventional activated sludge process

Research was completed on the behaviour and fate of tetrabromobisphenol A (TBBPA) in pilot-scale membrane bioreactors and conventional activated sludge (CAS) process at the City of Guelph Wastewater Treatment Plant. Emphasis was on the physicochemical processes, biological transformation and sorption kinetics. Measurement of TBBPA at the environmental level can be challenging, so the main focus ...

Sep. 5, 2014

By IWA Publishing

Modelling a full scale membrane bioreactor using Activated Sludge Model No.1: challenges and solutions

A full-scale membrane bioreactor (1,600 m3 d−1) was monitored for modelling purposes during the summer of 2006. A complete calibration of the ASM1 model is presented, in which the key points were the wastewater characterisation, the oxygen transfer and the biomass kinetics. Total BOD tests were not able to correctly estimate the biodegradable fraction of the wastewater. Therefore the wastewater ...

Nov. 1, 2010

By IWA Publishing

Laboratory Evaluation of Relationships Between Solids Retention Time, Microbial Diversity, and Settling Characteristics of Activated Sludge

ABSTRACT As one of the largest means of achieving pollution control of our waterways, activated sludge is of considerable practical importance. Satisfactory operation of this process, however, has often been hampered by various problems associated with poor settling capability of activated sludge. Despite extensive research, no definitive solutions to these problems exist due to a lack ...

Oct. 13, 2007

By Water Environment Federation (WEF)

The Use of Oxidation-Reduction Potential as a Means of Controlling Effluent Ammonia Concentration in an Extended Aeration Activated Sludge System

ABSTRACTThis study developed a strategy to control effluent ammonia from an activated sludge system, using oxidation-reduction potential. By controlling effluent ammonia concentrations, disinfection of treated wastewater is more cost effectively achieved by chloramination rather than break-point chlorination. The system under consideration was an extended aeration oxidation ditch. The study takes ...

Oct. 22, 2006

By Water Environment Federation (WEF)

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