Gudrun Hanna Erika Raelert

ZRE Zentrum für Ressourcen und Energie GmbH is an engineering services company based in Hamburg, Germany. The CEOs of the German company are Rüdiger Siechau, Gudrun Hanna Erika Raelert. ZRE provides engineering services.

SRH Verwaltungsgesellschaft mbH is a waste management company based in Hamburg, Germany. The German company provides waste containers ranging from 60 to 1,100 liters in volume and emphasizes the importance of waste separation for environmental protection and cost savings. The company has developed two apps, the "Zero Waste Map" and the "Stadtreinigung" app, to help users reduce waste and report littering. The company is ultimately controlled by the City of Hamburg. The company was founded in 2000, and its CEOs are Gudrun Hanna Erika Raelert and Joachim Greinert.

WERT Wertstoff-Einsammlung GmbH is a certified waste management company in Germany that offers disposal services for various types of waste, including food waste and used cooking oil. The company is based in Hamburg, Germany. The company provides four container sizes for the disposal of food waste and a 100-liter container for used cooking oil. The company's subsidiaries are ultimately controlled by the City of Hamburg. The CEOs of the company are Gudrun Hanna Erika Raelert, André Scharnewski.