NOUAKCHOTT, Aug. 21 (Xinhua) -- Late into the night, Mauritanian Minister of Hydraulics and Sanitation Amal Mint Maouloud stood quietly on the operation platform of the Beni Nadji water pretreatment station in the southwestern Trarza region.
In front of her, six sets of high-density sedimentation tanks entered trial operation as data flickered across the control screens. When the turbidity level finally dropped to a clear 113 nephelometric turbidity units, she breathed a sigh of relief. With a smile, she turned to the technicians beside her and raised a thumbs-up.
