摘要：According to a survey of Japan Environment Agency, more than 10% of boron concentration of river water, lake water and groundwater are over the guidelines of water quality: 0.2mg/L and 100% of that of seawater are also over them. But that of standard sea water is about 4.4mg/L, so those are more than effluent standards of Osaka Prefecture. Therefore that status is natural. On this background, following water quality standard B: 1mg/L, the effluent standard B: 10mg/L (in the case of sea area: 230mg/L) was reported by the Central Environment Council on Dec. 14th, 2000. Up to now, we have paid attention to problems concerning mercury, fluorine, incineration fly ash, nitrogen and phosphorus and new controlled-chemical standards in effluent from the Osaka City garbage incineration plants. According to a survey of the Environmental Management Bureau, no items about new toxic chemicals were detected, but boron was from 0.9 to 4.3mg/L, over the Osaka Prefecture effluent standard 2.0mg/L. On this situations this study was started by the severe Sewageworks Bureau indication. In this investigation, following the outline of boron toxicity and its origin, the status of wastewater from Osaka City garbage incineration plants and the results of studies on economic treatment methods will be reported, and the best suitable treatment flow will be suggested. In conclusion, for the removal method of boron from scrubbing wastewater, ion changing region method is best, and one tenth of the volume is back-washing water, whose wastewater should be treated by coagulation sedimentation with aluminum sulfate and slaked lime. In this case four cases will be proposed about the flow, whose costs are from only neutralization to 2, 700 hundreds yen per cubic meter.
