To provide suppression of the precipitation of salt from backwash water in a wastewater treatment facility utilizing filtered water containing salt as raw water for back washing of a filter membrane system.SOLUTION: A wastewater treatment facility 11 includes: a filter membrane device 16 which filters wastewater containing salt and discharges filtered water containing salt; back washing means 21 which performs back washing of the filter membrane device 16 using filtered water as backwash water; and precipitation prevention means 29 which prevents salt precipitation from the backwash water by suppressing the concentration of salt contained in the backwash water to a level equal to or lower than the solubility.SELECTED DRAWING: Figure 1
【課題】塩分を含むろ過水をろ過膜装置の逆洗用の原水として利用する排水処理設備において、逆洗水からの塩分の析出を抑制する。【解決手段】排水処理設備11は、塩を含む排水をろ過し、塩を含むろ過水を排出するろ過膜装置16と、ろ過水を逆洗水としてろ過膜装置16を逆洗する逆洗手段21と、逆洗水に含まれる塩の濃度を溶解度以下に抑えることによって逆洗水からの塩の析出を防止する析出防止手段29と、を有する。【選択図】図1
WASTEWATER TREATMENT FACILITY AND WASTEWATER TREATMENT METHOD
排水処理設備及び排水処理方法
2021-01-07
Patent
Electronic Resource
Japanese
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