... The phosphorus concentrations in the influent (after ozonation) and effluent of the phosphorus adsorption column are shown in Fig. 4. During the operation, about 70% of the phosphorus in the ... microbubble ozonation improved the mass transfer of ozone, and the high inner pressure in the bubbles could accelerate the formation of hydroxyl radicals. Therefore, some of the biorefractory and/ or ... quality in the effluent and MLSS concentration in the reactor were affected by the ozonation conditions (Figure 2). In Phase 1, 23% of total MLSS per day was withdrawn, and the sludge was ozonated...