Stuttgart Mühlhausen, Germany
Stuttgart Mühlhausen, Germany

Time filter

Source Type

PubMed | Karlsruhe Institute of Technology, Federal Institute of Hydrology BfG, Goethe University Frankfurt, Zweckverband Landeswasserversorgung and 2 more.
Type: | Journal: Environmental science & technology | Year: 2016

A multidisciplinary concept has been developed to compare advanced wastewater treatment processes for their efficacy of eliminating micropollutants and pathogens. The concept is based on (i) the removal/formation of selected indicator substances and their transformation products (TPs), (ii) the assessment of ecotoxicity via in vitro tests, and (iii) the removal of pathogens and antibiotic resistant bacteria. It includes substances passing biological wastewater treatment plants regulated or proposed to be regulated in the European Water Framework Directive, TPs formed in biological processes or during ozonation, agonistic/antagonistic endocrine activities, mutagenic/genotoxic activities, cytotoxic activities, further activities like neurotoxicity as well as antibiotics resistance genes, and taxonomic gene markers for pathogens. At a pilot plant, ozonation of conventionally treated wastewater resulted in the removal of micropollutants and pathogens and the reduction of estrogenic effects, whereas the in vitro mutagenicity increased. Subsequent post-treatment of the ozonated water by granular activated carbon (GAC) significantly reduced the mutagenic effects as well as the concentrations of remaining micropollutants, whereas this was not the case for biofiltration. The results demonstrate the suitability of the evaluation concept to assess processes of advanced wastewater treatment including ozonation and GAC by considering chemical, ecotoxicological, and microbiological parameters.

Bollmann A.F.,Zweckverband Landeswasserversorgung | Seitz W.,Zweckverband Landeswasserversorgung | Prasse C.,Federal Institute of Hydrology | Prasse C.,University of California at Berkeley | And 3 more authors.
Journal of Hazardous Materials | Year: 2016

This study examines the transformation and removal of the atypical antipsychotics amisulpride and sulpiride and the anticonvulsant lamotrigine in municipal wastewater treatment plants (WWTPs). Amisulpride, sulpiride and lamotrigine were selected using a tailored non-target screening approach. In WWTPs, lamotrigine concentrations increased from 1.1 to 1.6 μg/L while sulpiride and amisulpride exhibited similar concentrations, up to 1.1 μg/L and 1.3 μg/L, respectively. It was found that N2-glucuronide conjugates of lamotrigine were cleaved to form lamotrigine. Both lamotrigine and amisulpride were detected in groundwater with a concentration of 0.07 μg/L. Sulpiride was identified but not quantified. This demonstrates that amisulpride, sulpiride and lamotrigine might be used as indicators for treated wastewater in raw waters used for drinking water production. Furthermore, it could be shown that all three pharmaceutical compounds are efficiently oxidized by ozonation, leading mainly to N-oxide oxidation products. No significant removal of the N-oxides of amisulpride, sulpiride and lamotrigine was observed in the bench-scale biodegradation experiments with activated sludge. This indicated their high biological persistence. Therefore, N-oxides might be appropriate as indicators for post-ozonation as a major technology for the advanced treatment of secondary effluent. © 2016 Elsevier B.V.

Jiang J.-Q.,Glasgow Caledonian University | Durai H.B.P.,Glasgow Caledonian University | Winzenbacher R.,Zweckverband Landeswasserversorgung | Petri M.,Zweckverband Bodensee Wasserversorgung | Seitz W.,Zweckverband Landeswasserversorgung
Desalination and Water Treatment | Year: 2015

Abstract: The present study aims to investigate the efficiency of on-site produced ferrate(VI) for drinking water treatment as well as for the removal of micro pollutants. The study examined and validated the laboratory electrochemical production of ferrate(VI) and tested water treatment efficiency of the resulting ferrate(VI) in comparison with that of FeClSO4 and poly-aluminium chloride (PACl). The performance of water treatment was compared by the removal efficiency of turbidity, dissolved organic carbon, microbial count and trace organic micro pollutants. Major observations were that 0.5 mg/L of ferrate(VI) as Fe was sufficient to remove most of the contaminants and achieve complete disinfection irrespective of the original microbial counts. Ferrate(VI) has considerable oxidation potential to degrade commonly occurring trace organic micropollutants (other than melamine) in the Danube River water. In contrast, FeClSO4 or PACl cannot remove any trace micro pollutants. © 2015 Balaban Desalination Publications. All rights reserved.

Haakh F.,Zweckverband Landeswasserversorgung | Horlacher H.-B.,TU Dresden | Veit M.,Zweckverband Landeswasserversorgung
BHR Group - 11th International Conferences on Pressure Surges | Year: 2012

A pressure surge protection using air chambers with vortex throttles for oscillation damping has been selected for the Laichinger Alb pipeline that is to be newly constructed to supply drinking water to the southwest supply area of water supply company Landeswasserversorgung and for the rising main from Egau waterworks. This article describes the design, the calculation results and the actual, measured, hydraulic properties of the systems. It appears that the pressure surge protection devices meet all of the requirements. The simulation results are sufficiently precise, although a further improvement in accuracy remains desirable. Furthermore, a calculation approach is presented for improved description of the thermodynamic processes in the air chamber. © BHR Group 2012 Pressure Surges 11.

For the new drinking water pipeline "Laichinger Alb" of the Landeswasserversorgung, which connects the south western supply area with the main pipe system of the Landeswasserversorgung, a surge protection device with a pressure tank and two serial vortex chambers for damping have been selected. The article describes design and dimensioning as well as computer simulation results and the real hydraulic behavior of the system gained by experimental investigations. It has been shown, that the surge protection device meets all needs. The results by computer simulation have been exactly enough for predesigning, but a further improvement of accuracy still remains desirable. Need for further research activities exist when considering the parameters having inluence on the polytropic exponent for describing the change of state the compressed air within the pressure tank.

The water supply company Landeswasserversorgung in Stuttgart, Germany, supplies drinking water to around 250 cities and towns in Baden-Württemberg and Bavaria. The long-distance pipelines cover great height differences and long reaches, so energy efficiency is for pumping and energy recovery by drinking water turbines and best practice for operation of great importance. This article introduces into considerations for optimizing operation as well as aspects for replacing aggregates of pumping systems. Furthermore, the optimum operation and dimensioning of drinking water turbines are explained. At the end is shown, how these measures improve the energy balance of the Landeswasserversorgung.

Haakh F.,Zweckverband Landeswasserversorgung
GWF, Wasser - Abwasser | Year: 2015

Vortex-throttle devices show a characteristic asymmetric throttle behavior and are proved for dampening water-mass oscillations in pipe-systems caused by transient effects. This paper shows how to compute the velocity profile of the vortex flow. New is the approach to estimate the polar moment of inertia from the kinetic energy of the vortex flow. Based on this, the differential equation describing transient flow within the system vortex-trottle-pipe is derived. The Comparison of numerous measured with computed data shows, that the developed solution describes the transient effects within the system vortex-throttle-pipe as well as for step responses as for variable energy head quite well.

The supply of water is primarily a reserve capacity. With this in mind, the current allocation of water supply costs is being called into question and shall be examined to see that it meets the criteria of a "justifi - able" water price with regard to its effects on individual households. It will show how strongly various allocation systems react to demographic change. In doing so, the "trend variations" shall be based on the data to be recorded until 2050 by the German Federal Bureau of Statistics (Statistisches Bundesamt) and the State Bureau of Statistics (Statistisches Landesamt). Using random evaluations, the effects shall be apportioned according to household size. A conclusion shall summarise the most important results and any need for action.

The technical safety management has been introduced ten years ago in August 2000 by DVGW. Some water supply companies which have passed the certification procedure early after its implementation have already passed the first reaudit, which is due every five years. The Landeswasserversorgung has met the requirements of certification and has excellently fulfilled the review requirements in 2009. In this article a report is given about the experiences with setting up and maintaining the technical safety management, about the certification procedure and the certification preparations. Another issue of this article is the process of composing and using the operation manual.

Concerning the maintenance and repair of drinking water pipelines the question whether it's more economical to repair in each particular case of a pipe damage or to start a completely overhaul of the entire pipeline is essential. The occurrence of pipe damage can be represented as a stochastic parameter depending on age and location. A computational model is applied to this data which enables the variation of the length of the stretch of pipe beeing replaced in case of pipe damage. The computational method is fine-tuned with the help of the option of varying the interest and price increases and in this way specifying different variations in both the cash value and remaining useful life. Using a sample case proves that there is an economic optimum between repairing and renewing. The article describes the methodology in an easy-to-follow way. © Messe Berlin.

Loading Zweckverband Landeswasserversorgung collaborators
Loading Zweckverband Landeswasserversorgung collaborators