Essen, Germany
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Allerdings D.,WTE Wassertechnik GmbH | Forster G.,WTE Wassertechnik GmbH | Vasyukova E.,TU Dresden | Uhl W.,TU Dresden
Water Science and Technology | Year: 2015

This study focuses on the effect of rapid mixing on the coagulation efficiency in a full-scale drinking-water treatment plant and discusses the mechanisms involved in the floc-formation process. The results refer to three periods of operation of the water works when nomechanical mixing was provided in the tanks for coagulant dosing due to mechanical failure of the rapid mixers. Although a certain deterioration of the subsequent flocculation process was observed, as assessed using the data for suspended solids, turbidity, and chemical oxygen demand, the overall water treatment performance was not affected. This suggests an insignificant role for intense rapid mixing in sweep flocculation during full-scale water treatment and reveals the potential to reduce the required energy costs for mechanical mixers. © IWA Publishing 2015.


PubMed | TU Dresden and WTE Wassertechnik GmbH
Type: Journal Article | Journal: Water science and technology : a journal of the International Association on Water Pollution Research | Year: 2015

This study focuses on the effect of rapid mixing on the coagulation efficiency in a full-scale drinking-water treatment plant and discusses the mechanisms involved in the floc-formation process. The results refer to three periods of operation of the waterworks when no mechanical mixing was provided in the tanks for coagulant dosing due to mechanical failure of the rapid mixers. Although a certain deterioration of the subsequent flocculation process was observed, as assessed using the data for suspended solids, turbidity, and chemical oxygen demand, the overall water treatment performance was not affected. This suggests an insignificant role for intense rapid mixing in sweep flocculation during full-scale water treatment and reveals the potential to reduce the required energy costs for mechanical mixers.


Pelivanoski B.,WTE Wassertechnik GmbH | Pirke K.,WTE Wassertechnik GmbH
Water Practice and Technology | Year: 2014

One of the worst environmental problems facing humanity in regard to contamination in drinking water is arsenic. The World Health Organisation has set a standard 10 μg/l for arsenic in drinking water. Arsenic is a natural element that is present in many regions of the world. The groundwater can be heavily polluted in these areas, and often no other water sources are available. The case study presented here is situated in northern Serbia. The groundwater shows concentrations up to 135 μg/l with an average of 110 μg/l of arsenic. The additional high concentrations of natural organic matter, phosphates, dissolved methane, volatile organic carbon and ammonia boron and sodium further complicate the treatment.Different treatment technologies have been tested over the past decades but proved either inefficient or not economical. The pilot testing period started in September 2012 and ended in August 2013. The most stable and economical process was then further optimized and adjusted. The process comprises multiple treatment stages including stripping, precipitation, bio-filtration and two stages ion-exchange as well as partial reverse osmoses.The process design guaranteed outflow values defined according to the European directive 98/83/EC. © IWA Publishing 2014.


Schewerda J.,WTE Wassertechnik GmbH | Forster G.,WTE Wassertechnik GmbH | Heinrichmeier J.,WTE Wassertechnik GmbH
Water Science and Technology | Year: 2014

The most widely used methods for sludge blanket measurements are based on acoustic or optic principles. In operation, both methods are expensive and often maintenance-intensive. Therefore a novel, reliable and simple method for sludge blanket measurement is proposed. It is based on the differential pressure measurement in the sludge zone compared with the differential pressure in the clear water zone, so that it is possible to measure the upper and the lower sludge level in a tank. Full-scale tests of this method were done in the secondary clarifier at the waste water treatment plant in Hecklingen, Germany. The result shows a good approximation of the manually measured sludge level. © IWA Publishing 2014.


PubMed | WTE Wassertechnik GmbH
Type: Journal Article | Journal: Water science and technology : a journal of the International Association on Water Pollution Research | Year: 2014

The most widely used methods for sludge blanket measurements are based on acoustic or optic principles. In operation, both methods are expensive and often maintenance-intensive. Therefore a novel, reliable and simple method for sludge blanket measurement is proposed. It is based on the differential pressure measurement in the sludge zone compared with the differential pressure in the clear water zone, so that it is possible to measure the upper and the lower sludge level in a tank. Full-scale tests of this method were done in the secondary clarifier at the waste water treatment plant in Hecklingen, Germany. The result shows a good approximation of the manually measured sludge level.

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