Fig. 2From: Bioremediation of brewery wastewater using hydroponics planted with vetiver grass in Addis Ababa, EthiopiaRemoval of nutrients during system operation. a TKN mass loading vs. mass removal; b NH4+-N mass loading vs. mass removal; c NO3−-N mass loading vs. mass removal; d PO −34 -P mass loading vs. mass removalBack to article page