The acquisition has doubled GWBs capacity, so it now covers the Midlands and London as well as North England.
GWBs commercial director Matthew Miles said: GWB has maintained a strong service ethos that you might expect from a family business thats been operating since 1933. Its spearheaded by a great management team who have created an efficient business model in West Yorkshire.
The new GWB will give health authorities throughout the UK, including London, a competitive and efficient alternative. Were keen to offer clinical waste producers treatment and collection on a big enough to handle, small enough to care basis.
Mr Miles decided to help secure the deal after trading with MWS through his previous company 3b Waste in 2001.
The firms use the innovative Rotoclave system to treat the waste, which sterilizes and shreds it to such a degree that it can then be disposed of as municipal waste.
GWB are planning to open a new plant in the south to service London enabling the firm to handle up to 20,000 tonnes of clinical waste each year.
GWB managing director Deanna Butler said: Were really excited about the possibilities and challenges ahead as we work towards becoming a national player and one of the largest independent operators in this sector.
Former MWS customers have been assured that through GWB they will receive an independent, competitive quality service.
MWS business and its assets were bought as a going concern out of administration.