The aim of FYSAM Auto Decorative GmbH was to discharge an aluminium quantity of 1 kg/h from an anodizing bath in order to maintain a desired aluminium concentration permanently in the bath. In order to solve this problem, a module system with 10 spiral membrane modules was integrated into the plant. The volume flow of the spiral membrane modules amounts 15 l/h.

We were commissioned by Grau & Wagenblast with the following key data: Two anodising baths with a filling quantity of 2000 litres each and a desired aluminium discharge quantity of 90 g/h. We realized the project with a compact system of one module, which was integrated into the periphery. This module allows the user to set a variable volume flow ranging from 3 l/h to 15 l/h for the flow through the spiral membrane module. This makes it possible to react flexibly to the amount of aluminium.

The goal of Witte-Metallveredelung GmbH was to process one bath of anodizing. We realized the project with a compact 1 unit system. This system allows the user to set a variable volume flow of 7 l/h to 15 l/h for the flow through the spiral membrane module. This gives the possibility to react flexibly to the amount of aluminum introduced.

At Gretsch-Unitas, a complete system consisting of a DDSU150 supply unit with two DS10 module systems with a total of 15 spiral membrane modules was installed. This system is designed for applications > 100 l/h acidic process solution. Our system was connected to several anodizing baths and operated continuously in three-shift operation.

At ALOXAN we delivered a complete system consisting of a supply unit DDSU150, a module system DS10 with three spirale membrane modules WD-AR10-1001 to prepare an ELOXAL bath of 14 m³. The system was designed to process a volume flow of 50 l/h for a working time of 16 h/day. The customer achieved a sulfuric acid recovery rate of at least 75 %. The sulphate load in the wastewater is reduced, the use of caustic soda for neutralization and the formation of sludge are reduced.

A 72 m³ anodized pool is to be processed at the BWB Group in Switzerland. A complete system with pre-filtering, power supply unit and two module boxes for a total of 14 spiral membrane modules was required to implement this project. The system allows the user to keep the Al concentration target at 9 g/l. The total performance of the volume flow is 120 l/h.

The aluminium input into the anodizing plant at Aalberts Surface Technologies is approx. 0.5 kg/h. The targeted Al concentration in the anodizing bath is 8 g/l. This was achieved with a system consisting of a safety filtration unit, a DDSU150 supply unit and a DS10 module system equipped with 7 membrane spiral modules. The system runs in two-shift operation.

In a second step, the pickling line was equipped with a compact system from the DDP2 series to recover the free hydrochloric acid.

At AMI BV from the Netherlands, two anodizing tanks, each with 4.2 m³, were to be processed. With a metal input of approx. 380 g/h, the feed volume flow to be processed was 40 l/h. A compact system DDP2-01 including a 3-stage emergency filtration and 2 modules of the AR20 series was used. With an operating time of 9 hours per day, a target concentration in the bath of the desired 10 g/l aluminum salt could be maintained.