WATER TREATMENT SYSTEM AND WATER TREATMENT METHOD

To perform advanced treatment in water treatment using a reverse osmosis membrane at a low cost.SOLUTION: Single membrane separation means 1 separates supply water into permeated water and solute-enriched water by a reverse osmosis membrane. A raw water tank 2 is supplied with the supply water and all or a part of the solute-enriched water. A plurality of storage tanks 3 are supplied with all or a part of the permeated water or the solute-enriched water. A switching mechanism 6 switches water supply of water flow from the raw water tank 2 or one storage tank 3 to the membrane separation means 1, water supply of the permeated water from the membrane separation means 1 to another storage tank 3, or water supply of the solute-enriched water from the membrane separation means 1 to another storage tank 3.SELECTED DRAWING: Figure 1 【課題】逆浸透膜を用いた水処理において低廉に高度処理する。【解決手段】単一の膜分離手段１は供給水を逆浸透膜により透過水と溶質濃縮水とに分離する。原水タンク２には、前記供給水と前記溶質濃縮水の全部若しくは一部とが供される。複数の貯蔵タンク３には、前記透過水若しくは前記溶質濃縮水の全部若しくは一部が供される。切り替え機構６は、原水タンク２若しくは一つの貯蔵タンク３から膜分離手段１への通水、膜分離手段１から他の一つの貯蔵タンク３への前記透過水の送水、または、膜分離手段１から他のもう一つの貯蔵タンク３への前記溶質濃縮水の送水の切り替えを行う。【選択図】図１