German firm extols the merits of stainless steel

Stainless steel tanks and corrugated stainless steel tank for the paper industry in Bavaria.

German stainless steel products supplier Erich Stallkamp will be exhibiting a number of tank products aimed at the wastewater industry at the forthcoming IFAT show (Munich, 14-18 May).

A press release from the firm suggests its claim to have “the necessary know-how” is proven by various projects from the last 25 years. In one application, an extensive wastewater treatment plant with two steel tanks (Ø15.52m, h=8.78m) was designed and installed in Bavaria as a wastewater collection tank. In another application, a corrugated steel tank (Ø2.75m, h=8.78m) was provided to serve as an equalising tank for the paper industry.

The firm has also provided large wastewater pre-treatment plants for the food industry, giving the example of a plant in North Rhine-Westphalia, which deployed a stainless steel tank (Ø16.29m, h=10.03m) with self-supporting ribbed dome roof and various add-on parts.

Self-supporting stainless steel roof.

Special designs
Bespoke and specialty designs are also seemingly within the firm’s range. In Herzebrock, for example, a sewage treatment plant with several clarifiers (Ø outside 24.00m, Ø inside 3.88m, h=4.18m) was developed, which is controlled by means of overflow heights. In another design, funnel-shaped secondary clarifiers (Ø top 7.65m, Ø bottom 1.40m, h=5.00m) have been implemented, with a toothed gutter. This was for a private brewery, and has seemingly provided a great deal of stability and longevity.

Currently, a wastewater project with three stainless steel tanks for an automobile manufacturer in Ingolstadt is being implemented. One of the tanks is a sludge storage tank for flocculated sludge (180 m³), which is equipped with many attachments and agitator technology. In addition, two clean water tanks (each 120 m³) are supplied. All three tanks are constructed with a self-supporting stainless steel roof.

Stainless steel tank with stainless steel floor.
Wastewater tank with self-supporting ribbed dome roof (2.000m³).

Why stainless steel?
The firm says the decision to use stainless steel is always worthwhile, since “the follow-up costs for maintenance and repair are reduced to a minimum.” Stainless steel owes its resistance to corrosion to a simple chemical reaction: due to its chromium content, an ultra-thin chemically resistant passive layer forms on the surface in conjunction with oxygen in the air or water. If the passive layer is damaged by external influences, it will form a new layer from the matrix of the stainless steel. Unlike other materials or material combinations, stainless steel can be completely and easily recycled after use.

In addition to high-quality stainless steel tanks, Stallkamp also offers the associated pump and agitator technology. For special use in waste and clarification tanks, a full stainless steel mixer is recommended, which is designed for stirring liquids with a variable pH value, generally from pH 5.3 to pH 8.1 at room temperature of 20°C. The Stallkamp portfolio also includes separation technology, which is produced for a wide variety of applications and dry matter contents.