Is an Effective Recovery of Heavy Metals from Industrial Effluents Feasible?
© Lehrstuhl fĂĽr Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2016)
Metallic elements and their compounds represent, depending on their concentration and bioavailability, a potential hazard to the health of humans, animals, plants and other living organisms. Large volumes of water contaminated with heavy metals or radioactive elements are generated e.g. during mining processes or industrial productions. In general, legal limits are low and strict to ensure purifying of wastewater.

Sewage Sludge Treatment in Europe – an Overview
© TK Verlag - Fachverlag fĂĽr Kreislaufwirtschaft (10/2012)
With the implementation of the Urban Waste Water Treatment Directive 91/271/EEC, municipal sludge production has increased steadily in the EU during the last decade, although reduced water consumption and increased sludge treatment in some memberstates may have caused a stagnation or even slight decrease in sludge production (e.g. Germany, Austria, Sweden). Based on data provided to the European Commission for the 2002 – 2006 period, about 9.7 million Mg sludge solids are produced in the EU each year, 8.7 million Mg in EU-15 and an additional 1.0 million Mg in the new member states. Nearly 70 % of the total sludge mass is produced in Germany, UK, Italy, Spain and France. Until 2020, annual EU sludge production is expected to increase by 30 % up to 13 million Mg dried solids.

Pressure of Urbanisation and a Sustainable Sanitation Infrastructure: Experiences with a Research-Driven Planning Method in Northern Namibia
© DIV Deutscher Industrieverlag GmbH (9/2012)
Improvements in sanitation infrastructure in developing countries are of major importance. CuveWaters, a research project working in the north of Namibia, is piloting decentralised technologies for water and sanitation. Technologically sophisticated concepts can easily clash with users’ needs and everyday behaviour. There is not always a shared understanding of planning and maintenance. A demand-responsive approach has therefore been developed. It aims to support the planning and implementation process and to include stakeholders prior to intervention, thus allowing mutual learning as a basis for a sustainable transformation process in urban areas. This paper discusses method development, empirical application and results.

A Turbo for the Base Load, Blower for the Peak Load
© DIV Deutscher Industrieverlag GmbH (9/2012)
Process Air Generation in the Sewage Treatment Plant Bremervörde with Highest Energy Efficiency

Sustainable MBR Application by Mechanical Membrane Cleaning
© DIV Deutscher Industrieverlag GmbH (9/2011)
A non-chemical, mechanical cleaning process has been developed, in which granulates (particles) are added to the activated sludge in order to effect a continuous abrasion of the fouling layer.

Toray Membrane Europe AG
© DIV Deutscher Industrieverlag GmbH (9/2011)
Successfully Tested the Process Combination of Ultrafiltration and Powdered Activated Carbon for Advanced Wastewater Treatment in Lab Scale

Interview: Membrane technology under discussion
© DIV Deutscher Industrieverlag GmbH (9/2011)
The Institutes for Environmental Engineering (ISA) and for Chemical Process Engineering (AVT) of RWTH Aachen University together with the International Water Association (IWA) this year arrange the 6th IWA Specialist Conference on Membrane Technology for Water & Wastewater Treatment, an international forum for experts with about 140 lectures on the current status of research and development in membrane technology, Prof. Dr. Johannes Pinnekamp, director of the ISA, and Christine Ziegler of gwf-Wasser|Abwasser talked about the orientation and significance of the event and the major applications of membrane technology in the field of water and wastewater treatment.

Tertiary Filtration with Ultrafiltration Membranes in Municipal Wastewater Treatment Plants - Engineering challenges for the implementation in existing wastewater treatment plant
© DIV Deutscher Industrieverlag GmbH (9/2011)
During the operation of tertiary filtration stages in a dead-end-mode, retentate concentrate and rinsing water from membrane cleaning accrue naturally. Work on process solutions for these process waters with no additional particle loads for the tertiary membrane fi ltration stage and no further hydraulic loads is obviously necessary. A process engineering concept for the treatment of retentate volume fl ows by a combination of fl otation technology, secondary fi ltration and centrifuge technology allows for a hydraulic isolation of the tertiary membrane fi ltration stage from the biological wastewater treatment.

Fate of Pharmaceuticals during Wastewater Treatment by a Membrane Bioreactor
© DIV Deutscher Industrieverlag GmbH (9/2011)
This study provides a comprehensive insight into the levels and fate of nine commonly used pharmaceuticals (amitriptyline, atenolol, gemfi brozil, ibuprofen, ketoprofen, metformin, naproxen, paracetamol and simvastatin) through a full-scale membrane bioreactor (MBR) in New South Wales, Australia. Seven out of the nine studied pharmaceuticals were detected in the raw sewage with average concentrations in the range of 1.29– 33.3 μg.L–1, while gemfi brozil and simvastatin were below the analytical detection limit (1 ng.L–1). The MBR consistently achieved high removal effi ciencies of the detected pharmaceuticals, in the range of 77.2–99.9 %. A mass-balance showed that sorption to biomass was the dominant removal mechanism for amitriptyline while biodegradation/ transformation was responsible for removing all other pharmaceuticals. This study revealed that log D (Log Kow corrected for ionisation at the ambient pH) provides an effective estimation of the sorption capacity of these pharmaceuticals to biomass.

Membrane Filtration of Wastewater Split Flows originating from Paper Industry and Biological Wastewater Treatment of the generated Membrane Concentrates
© DIV Deutscher Industrieverlag GmbH (9/2011)
Wastewater effluents from deinking- and TMP processes were taken and were concentrated in 2 stages consisting of ultra- and nanofi ltration. Futher more, the concentrates were biologically treated with a single aerobic and a hybrid anaerobic-aerobic process. With a continuous anaerobic reactor and an aerobic SBR reactor experiments were conducted to study the variations in hydraulic retention time (HRT), food to biomass ratio (F/M) and wastewater concentrate. For the deinking wastewater concentrate, an overall average COD elimination of 51 % and 57 % was achieved for aerobic and anaerobic-aerobic treatment, respectively. Single stage aerobic treatment of TMP wastewater concentrate had an mean COD elimination effi ciency of 61 % and the hybrid anaerobic-aerobic treatment yielded 73 %. The temperature in the aerobic biological SBR reactor was kept stable at 30 °C with an F/M ratio between 0.01 and 0.5 gBOD5/(gSS · d).

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