I In the industrial circle it has been evolved an idea of eco- efficiency. When originally the business communities cope with the waste after yielding it, then the present the weight point of management shafts towards the technological development and production process preventing the occurrence of the waste. The industry of pulp and paper yielded the waste water disturbing the waters environment. Therefore, it is necessarily built The Installation of Wastewater. Processing in order that can decrease the concentration of the suspended solidity that is difficult to be processed with a sedimentation because the fine fibres is difficult to be precipitated. One of alternatives to take such fibres is by using the dissolved air floatation method.The dissolved air floatation is a process of separating the solidity or suspended particle by means of floating. The suspended solid is floated onto the water surface by the aid of air bubbles and coagulant substance in a certain pressure.The air is saluted under the atmosphere pressure that released to the atmosphere pressure. The suspended particles will form the formations where the specific weight of particle is lower than that of water such that the particles will absorb the air bubbles. The particles will tend to rise up the surface and separated by sweeping out.In this research it has been conducted some pressure variations, those are :2.75; 3.2; 3.5 bar, living time : 20, 24, 30 minutes, as well as the influensuspended solid concentrations: 1000, 1100, 1200, 1300, 1400, 1500, 1600 mg/lt. The parameter observed is in the forms of the suspended solid and COD that each obtained from the result of analysis by using the gravimetry method and colorimetry method with wavelength of 600 nm.The efficiencyof removing the suspended solid and COD is influenced by the parameter of the living time. The increasing of the living time in the dissolved air floatation tank will decrease the removing efficiency. The optimum living time for the suspended solid and COD is 20 minutes.The variable of air ratio (A/S) process to the suspended solid is highlyinfluenced by the entirely removoing efficiency. If the ratio of A/Sis enlarged, then it will decrease the removing efficiencyof the suspended solid and COD. The result of research shows that the optimal ratio of A/S for the suspended solid and COD is0,0279 with the removing efficiency of the suspended solidity by 88% and the removing efficiencyof COD is by 95%.The variable of air ratio (A/S) process to the effiuent of the suspended solidshows that if the ratio A/Sis enlarged, the it will decrease the effluent value of thesuspended solid. The range of values of A/S is 0,0279 - 0,0447. The result of experiment shows that the optimal ratio A/Sis 0,0447.