Feb 5 (Reuters) - De.mem Ltd DEM.AX :
* DE.MEM LTD - SECURES NEW $780,000 ORDER FOR MINE SITE WATER TREATMENT PLANT OPERATIONS OVER 12 MONTHS
* DE.MEM LTD - CONTRACT TO MANAGE POTABLE WATER AND SEWAGE TREATMENT PLANTS AT RIO TINTO'S AMRUN MINE IN QUEENSLAND FOR