Whether in food and drink, cosmetic products, cleaning products or perfumes - consumers encounter International Flavors & Fragrances (IFF) products everywhere. The company, with its headquarters in New York, is one of the world's leading producers of fragrances and fla-vounngs for industrial clients. IFF uses may different basic substances in the production of their products, for example highly-concentrated oils. When the stainless steel tanks and pipes are cleaned after production, a trace of these substances end up in the wastewater - this is obvious from the smell. Therefore this mixture must first be treated before it can be discharged into the public sewers. Otherwise it can overstep legal thresholds and heavy polluter penalty levies may be applied. For this treatment. IFF's fragrance production location in Tilburg in the Netherlands has relied for some years on a combination of a grease separator and an active charcoal plant. 'But the operating costs were very high', said Rob de Hoog, Project Engineer at IFF. 'That is why we were looking for a new. cheaper, total solution, which we could use to eliminate certain organic substances which cannot be discharged at all. and at the same time to reduce the chemical oxygen demand (COD) by around 70 percent.'
- Application : Production of fragrances and flavours
- Wastewater volume : 150ms/day (peak level 70 m3/hour)
- Discharge : Indirect discharge
- Targets : eliminate organic substances. reduce COB load by 70 per cent
- Plant technology : an EnviModul including the main components of a Flomar HF 20 flotation tank, grease separator type HAB, buffer tank
A flexible modular system provided the solution
The choice was EnviModul from EnviroChemie. This is a flexible modular system for decentralised treatment ol process and wastewater, which we can adapt to the specific customer requirements', says Sicco Hilarius. Sales Manager at EnviroChemie in the Netheriands. For IFF this means an HAB type grease separator and the Flomar HF 20 flotation plant. The elements are housed in a twelve metre long steel module. The benefit: no dedicated building had to be built for wastewater treatment. The system is extremely flexible, so the capacity can easily be expanded by additional modules and - it necessary - the module can also be moved to another location quite easily. 'Those were also important aspects (or us, because we do not have a lot ot space on our site and we do not know if and when we mighl expand our production. With EnviModul we can retain our flexibility - if necessary we can just move the water treatment to another spot', says Hoog.
The right combination
The EnviModul plant was manufactured and accepted lor operation by IFF in Rossdorf. Since June 2013 it has been in use in the aroma production site in Tilburg. Up to 150 m3 ol wastewater is created each day there. Because the wastewater inflow and its composition are not regular, and when cleaning is under way it can even rise to 70 m3 per hour, a 50 m buffer storage tank has been installed upstream otthe actual treatment. 'The wastewater is collected there initially. That way we can ensure that the input to the plant is as constant as possible - both with an eye on the quantity as also in relation to the proportions of its contents', Hilarius explains. From the buffer tank the wastewater then flows into the grease separator. There the oils rise to the surface, thanks to the difference in gravity, and are skimmed off and collected. The pre-cleaned wastewater is then fed into the high performance flotation process. Here the plant uses a computer controlled programme to dose the wastewater with so-called flocculants, which bind the impurities into flakes. These are then floated to the surface using micro-bubbles and removed. After this, IFF can discharge the wastewater into the sewer leading to the public treatment plant -totally odourless.