WATER & WASTEWATER MANAGEMENT
comparative tests by TU Berlin, a Mecana drum filter system and the prototype of a new disk filter system from Invent were used. While the 16 filter frames of the disk filters were screened with optimised plain dutch weaves from GKD, the drum filter used pile fabric and microfibre filter media. To create valid comparative values for the plain dutch weave, the disk filter was fitted successively with ODW 20, ODW 8 and ODW 6. With the ODW 20, the dirt load of the water taken from the outlet of the sewage treatment plant was reduced from six to two milligrams per litre. At the same flow rate, the ODW 6 reduced the dirt load of the outlet water by a further 50% to a content of one milligram per litre. Te ODW 6 reached these excellent filtration rates in the micro-filtration range with a maximum throughput of 110m3
operation, they processed 50m3 per hour. Altogether, 79,000m3
per hour. In regular of water of sewage
treatment plant outlet water were treated with this precision mesh. Although the cloth filters on the drum filter system delivered marginally better separation performance than the disk filters, the ODW 6 made a better overall impression on the researchers. What convinced them was the sharp separating limit of the GKD sieves with the geometric pore size of 6 µm. As cloth filters are made of a tangle of fibres, they do not have a defined pore size and therefore do not allow reliably reproducible statements to be made. With a view to achieving as broad a spectrum of application in practice as possible, the
GKD developed a sampling basket that is used in conventional street drains instead of the usual leaf collecting baskets
ODW 6 also impressed with its universal usability: all disk filter systems – including those already available in sewage plants - can be fitted with this filter medium.
The stainless steel mesh sets new standards for flow rate and retention
50
www.engineerlive.com
USE IN RESEARCH AND PRACTICE Te ODW 6 also proved what its range of properties could do as a laboratory material in the OEMP project. Both the German Federal Environmental Agency and TU Berlin selected them for their laboratory applications. A higher federal authority, namely the German Federal Institute for Materials Research and Testing (BAM), also employed this mesh type for investigations into microplastics. Which is why GKD was involved in two other collaborative research projects – RAU (Tyre abrasion in the environment) and RUSEKU (Representative investigation strategies for an integrative understanding of systems used for specific entry of plastics into the environment) – as a development partner in the context of microplastic analytics. During the RAU project, GKD developed a sampling basket that is used in conventional street drains instead of the usual leaf collecting
baskets. Using an integrated filter cascade, it can specifically fractionate the particulate material in street runoff water. Tis property makes it a key element of the analysis instruments used to sample the entire flow of matter from a rain shower for the first time during the RAU project. Tis was not possible with the established sampling procedures in place at the time.
Looking back, GKD sees its project
participation in research programmes of this size as an important experience that opened up new prospects for the company. Its active collaboration in new areas of development for mesh and the interdisciplinary exchange in the project consortium resulted in various other impulses for interesting innovations. Plus, the attention that the projects received in the scientific arena justified GKD’s reputation as an expert research partner and solution developer in the field of microplastics. Tis expertise is confirmed by numerous inquiries from research institutes, colleges and industry representatives on the subject of analysing the retention of microplastic particles.
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68
