Celle, Germany
Celle, Germany

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Stuber J.,Kompetenzzentrum Wasser Berlin GGmbH | Miehe U.,Kompetenzzentrum Wasser Berlin GGmbH | Stein R.,Kompetenzzentrum Wasser Berlin GGmbH | Kohler M.,VWS Deutschland GmbH | Lesjean B.,Kompetenzzentrum Wasser Berlin GGmbH
Chemie-Ingenieur-Technik | Year: 2013

A pilot plant with a full scale monolithic ceramic membrane was operated at Ruhleben wastewater treatment plant (WWTP), Berlin Germany, for more than 12 months. Filtration performance according to the applied pre-treatment (dose of ozone and coagulant) were investigated. Trial runs with and without ozone, varying the operational parameters such as flux, coagulant dosage, and filtration time were conducted in order to identify the benefits of pre-ozonation. The reduction of the total fouling rate by ∼70 % when applying a specific ozone dose between 1.0 and 1.4 mg O3 mg DOC -1 highlights the potential of ozonation as pre-treatment step. Using LC-OCD measurements, the effect of ozone on the biopolymer concentration and the DOC fraction was demonstrated. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Ogiermann K.,VWS Deutschland GmbH | Meyerhoff T.,VWS Deutschland GmbH | Hagen K.,VWS Deutschland GmbH | Vendrup M.,Kruger A S
VGB PowerTech | Year: 2012

Strict limits must be adhered to for treating waste water incurred during flue gas desulphurisation (FGD). One and two-stage precipitation processes have proven themselves in FGD waste water treatment. Even with one-stage precipitation, all values according to Appendix 47 of the German Waste Water Management Regulations are complied with. Two-stage processes provide both a higher operating safety as well as improved conditions for waste disposal. -For the case of increased requirements in waste water limits, downstream processes can be selected, such as: - Discharge into a municipal waste water treatmentplant -Ammonium reduction by means of stripping -Nitrate reduction using biological processes - Further reduction of heavy metals - Zero Liquid Discharge systems Metals can be removed with the MetClean® process. This fluid bed technology cost-effectively reduces certain heavy metal concentrations to low residual concentrations without producing a harmful waste. Another option is evaporation. Waste water ZLD systems (Zero Liquid Discharge) recover, via a falling film evaporator with subsequent crystallisation, more than 98% of the water and produce, aside from the condensate, only a solid material that can be disposed of in a landfill. A further development, named ZLD CoLD™, significantly reduces the investment and operating costs of this solution. VWS Deutschland has, together with its sister companies of the Veolia water technology division, the process-oriented experience in order to treat FGD waste water of the most diverse composition such that it complies fully with the discharge requirements.

Bettin C.,VWS Deutschland GmbH | Schwarz B.,VWS Deutschland GmbH | Kornmueller A.,VWS Deutschland GmbH
Journal of Water Supply: Research and Technology - AQUA | Year: 2013

Challenge testing was carried out of full-scale prefiltration and ceramic ultrafiltration (UF) modules in a mobile drinking water treatment system. Three consecutive indirect integrity tests were performed using naturally contaminated public drinking water, stocking with wastewater as well as addition of powdered activated carbon. Besides checking the removal efficiency and integrity of the ceramic UF membrane, the overall aim of this type test was to prove that the treatment system fulfils the stringent limits of the German Drinking Water Regulation. Up to 4-log removal of different bacteria was achieved by the UF module, whereby log removal values (LRV) were only limited by the bacteria numbers in feed. Complete removal was likewise achieved for spiked particles. High integrity of the ceramic membrane proved that the mobile treatment system can not only be used for drinking water supply for disaster relief worldwide but also for emergency municipal water supply in Germany. © IWA Publishing 2013.

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