Electronic waste. Solid wastes are discarded solid materials which are produced due to various human activities. Solid wastes can be biodegradable, recyclable or non-biodegradable Solid wastes can be of the following types (i) Municipal Solid Waste Wastes from homes, offices, schools, hospitals etc. (ii) Industrial Wastes The wastes like scraps, flyash, etc., generated by industries (iii) Hospital Wastes Hazardous wastes containing disinfectants and other harmful chemicals generated by hospitals (iv) Electronic Wastes These are the damaged electronic goods and irreparable computers