Marel Water Treatment B.V. products

The main purpose of a screening system is to remove larger particles and solids which could block or damage downstream processes. Furthermore non dissolved parts are preferably removed in early stage to prevent unnecessary amplification of more challenging dissolved pollutants removal. The screening systems are typically fed from an influent pump pit and pump capacity may subsequently determine the filter intake flow.

The Marel DAF units (Dafinci) ensure optimal separation of the various pollution fractions and reduction of sludge volumes.

Coagulation is the process of forming semisolid lumps with the emulsified elements in a liquid by adding coagulants. Flocculants bind these small suspended particles into bigger more stable flock like agglomerates that can be separated easily from the waste water. Therefore, coagulation and flocculation are widely used to bind pollution present in wastewater. Coagulation Flocculation and Flotation (CFF) is a chemical pre-treatment solution that removes sediment, suspended and emulsified pollution from the wastewater. An equalization basin is often used before the CFF to limit the running costs of the system by levelling peaks in flow rate, pollution, pH values, temperature, etc.

Larger solids may represent a significant fraction of the total pollution load.  They can cause blockage of important parts of the wastewater treatment and may dissolve quickly making it more difficult to remove them from the wastewater. Hence a screen is applied to remove larger solids from the water.

The screen type is an internal fed rotating drum screen. The screening area is located on the inner side of the screen. The liquid flows through an inlet from the inside out, whereby separation takes place. The filtered liquid is collected in a trough and flows through the drain flange. The separated solids remain on the inside and with the help of a helix is this transported to the discharge chute. During transport, the solids are further dewatered.

The water enters the screen in an inlet compartment that overflows on one side on to the screen plate. A flow restrictor divides the water over the full width of the screen plate. In the upper part of the screen plate is almost parallel to the direction of the water. In this part the coarse material is left behind on the screen plate.

After the waste water has been puri?ed of coarse particles, greases and emulsions in an earlier stage, it may, for various reasons, be desirable to apply biological treatment. The puri?cation yield can be increased considerably through biological water puri?cation processes as they decompose dissolved organic substances as well 24 hours a day, 365 days a year. Furthermore, it is a ?rst step for the re-use of waste water.

Anaerobic biological treatment systems are ideally suited for highly contaminated waste water flows with little or no free fats. As a result many systems are supplied to the textile, sugar, potato processing and beverage industry. In this process dissolved and suspended carbohydrates, fats and proteins are converted into CO₂ and methane. This (bio) gas can be used as a fuel for amongst others boilers and dual fuel engines to generate electricity.

In a world where water is getting a scare resource we as Marel are looking to possibilities to treat the water in such a way that it is a sustainable way. Instead of discharging the treated water it can be re-used again at the customers plant. With re-use the water can be used at other applications such as gardening, truck wash, cleaning of crates, fire pond and irrigation.

In a world where sustainability is becoming ever more important and water is an increasingly scarce and/or costly commodity, Marel offers opportunities towards a more circular water usage. Instead of discharging the treated water it can be recycled back to the process area.