Wastes and waste waters from the food industries and slaughter houses were studied in such a way that the process could give a product with an added value. All the processes developed were efficient and could have a safe application and give the security to the consumer. Biotransformation of solid wastes from the food industry and other sources may constitute a very interesting approach to alleviate the problem of feed ingredients shortness in all the Arab countries. This way is very advantageous to avoid discarding solid wastes in the nature and also to contribute positively to the sustainable development.