Semnan - IRNA - What is called "dirty gold" today is, in fact, the waste of daily life of citizens, behind the scenes, illegal networks and big profits have been formed in the cities to take advantage of it. Mehdishahr city management was a pioneer in this field and in addition to organizing the collection process, it planned and implemented the "Bahrub Smart System" in the path of converting waste into added value, the burial center, construction waste management.