Micro-Screening Below 10 m With Higher Flow Rates Innovative flow-optimized Dutch weaves for water processing

GKD Flow-optimized Dutch weaves for water processing (┬®GKD)

By Peter Wirtz, Business Unit Manager, Solid Weave, GKD – Gebr. Kufferath AG

More than ever before, efficient water treatments with increasingly finer separation rates are major issues for wastewater treatment plant operators.
This year, the urgent search for solutions that can ensure reliable micro-screening at high flow rates and with improved separation performance brought visitors flocking to the GKD stand at the world’s leading trade fair for water, sewage, waste and raw materials management in Munich, Germany. They were primarily interested in GKD’s optimized plain Dutch weaves (ODW) and its latest developments. These innovative mesh constructions offer significant potential for improvement in the field of micro screening in terms of throughput, separation performance and service life.

According to UNESCO estimates, by 2025 two thirds of the world’s population will be affected by a shortage of water. At present, each person in Germany uses 1,426 cubic meters of water per year – directly in the household and indirectly through the products they consume. Worldwide, the per capita consumption rate – 1,385 cubic meters per person per year – is only marginally lower. For this reason, the efficiency of water processing is a key issue for both industries and local authorities. Because filter solutions made of metallic woven wire mesh by GKD regularly set new standards in the field of mechanical wastewater purification, there was a correspondingly high traffic to the GKD stand for filtration and process belt technology. High flow rates and dirt-holding capacity combined with good cleaning properties at ultrafine separation rates in the microfiltration range of 10 m and below qualify GKD’s ODW as an all-rounder in the field of water processing. Slot-shaped pores on the mesh surface and larger pores inside the mesh ensure that particles below the specified cut point pass smoothly through the filter media and don’t clog it up. The special pore geometry is what gives this mesh type its high dirt-holding capacity and, at the same time, its extremely low flow resistance. Its high throughput rates, the precision of its filtration rates and separation limits and its low tendency to clog all speak for the clear superiority of stainless steel ODW over plastic meshes in micro-screening.

The way to greater process efficiency

The news that GKD had further improved this tried-and-tested mesh type through specific modifications and further developments drew large numbers of planners, equipment manufacturers and plant operators to the GKD stand. With its flow-optimized ODW, GKD has succeeded in developing ultrafine filter media for hydrostatic filtration. Without any changes to the size of the mesh openings, the mesh construction increases the flow rate by up to 25% compared to that of conventionally woven meshes. The pore size of just 10 m – unprecedented in comparison to the currently available products of competitors anywhere in the world – and an 8.5-times lower pressure loss coefficient underline the outstanding efficiency of ODW. They combine an improved retention rate of total suspended solids (TSS) in the microfiltration range with a reduction of the turbidity level (Nephelometric Turbidity Units, NTU) and the concentration of algae. The porous structure of ODWs facilitates the same throughout with a smaller filter surface area, or a higher throughput with the same filter surface area. Combined with substantially finer filtration rates, these flow-optimized mesh constructions offer the prospect of an unprecedented level of process efficiency. In addition, thanks to substantially more stainless steel wires on the mesh surface compared to conventional ultrafine meshes, the individual pores are also extraordinarily stable, a feature which makes itself evident in the overall higher mechanical strength of the mesh. “Considering the economic and ecological challenges in the field of wastewater processing, the pressure to innovate is enormous,” said Wirtz, explaining the great interest shown by equipment manufacturers in this mesh construction.

“But, thanks to our integrated competence in engineering, development and ultra-modern manufacturing of these high-tech meshes, we are able to innovate at a pace which allows us to come up with the required answers to crucial challenges much faster than the others,” he added.

ABOUT GKD – GEBR. KUFFERATH AG

The owner-run technical weaver GKD – Gebr. Kufferath AG is a global market leader for metal and plastic woven solutions as well as transparent media facades. Under the umbrella of GKD – WORLD WIDE WEAVE the company combines three independent business units: SOLID WEAVE (industrial meshes), WEAVE IN MOTION (process belt meshes) and CREATIVE WEAVE (architectural meshes). With its six plants – including headquarters in Germany and other facilities in the U.S., South Africa, China, India and Chile – as well as branches in France, Great Britain, Spain, Dubai, Qatar and worldwide representatives, GKD is never far from its customers.