**6. Conclusions**

Residues from the beer, rice and sunflower oil production industries were used to prepare materials capable of cleaning wastewaters, support enzymes, act as catalysts or as scaffolds for tissue engineering or controlled desorption of bioactive substances. The use of these waste materials gives them an added value as a sustainable, environmentally friendly and economic supply of nanostructured materials, *i.e.* BBM derived materials obtained were as cytocompat‐ ible and osteogenic as HA powder, commonly used in bone and teeth replacement therapies, being non-cytotoxic and supporting cell growth and differentiation and of controlled desorp‐ tion of anticarcinogen 5-Fluorouracil. Sunflower oil production residues can be used as raw materials to transform glycerol from biodiesel production of the same company towards fuel additives. Rice husk derived materials can be used to support enzymes in an inexpensive and environmentally sound way. Furthermore, the design of materials are based on preparation methods kept as simple and inexpensive as possible, with low energy consumption and easily adoptable procedures, by careful design of parameters and use of characterisation techniques used in materials engineering.
