Ultrafiltration is a filtering technique in which hydrostatic pressure forces a liquid against a semipermeable membrane. The suspended solid particles (a.o. sludge) are retained in the process. The liquid purified endproduct is called 'permeate'.
Hooge Maey is constantly looking for ways to enhance her treatment processes and to make them more energy efficient. During the ultrafiltration process of waste water, the tubular membranes are susceptible to quick-caking resulting in a rapid productivity drop. This calls for frequent cleaning of the membranes. Until now this was usually solved by increasing the crossflow velocity. This, however, requires a lot of energy.
An innovative new design of membranes resolves this problem. The new membranes feature a helical shape on the inside of the tubular membrane, creating continuous turbulence at the membrane wall. Thanks to this eddy current, the membranes are constantly flushed clean even at low speed. The results are stunning: 40% more water is filtered using the same energy. Moreover, the membranes keep their high productivity level without the need for extra cleaning. This results in lower consumption of energy and chemicals.
The manufacturer of the membranes received an award of 'waterinnovator of the year' for this innovative design (febr 2016).
The landfill’s zone B is fully covered. Aftercare is at the centre of the action now. One aspect of this is the regular monitoring of the quality of the final cover. Hooge Maey applies new technology to do so. A drone equipped with a thermographic camera scans the surface of the landfill in search of methane emissions. This way, immediate action can be taken in case of leak detection. Hooge Maey is the first landfill to apply this technique.