The invention provides a water purification
system with concentrated water making and
backwashing functions and a water purification method. The water purification
system with the concentrated water making and
backwashing functions comprises a
raw water inlet
pipe, a water pump, an RO
membrane filter element, a concentrated
water storage barrel, a
purified water pressure
barrel and a loop portion, wherein a concentrated water outlet and a
purified water outlet of the RO
membrane filter element are communicated with the concentrated
water storage barrel and the
purified water pressure barrel respectively; a water outlet of the purified
water pressure barrel is connected with a water taking unit through an
active carbon filter element. The water purification
system with the concentrated water making and
backwashing functions is characterized in that a concentrated water making loop is arranged; the concentrated water making loop is composed of a concentrated water making pipeline, one end of the concentrated water making pipeline stretches into the bottom of the concentrated
water storage barrel, and the other end of the concentrated water making pipeline is communicated with a water inlet of the water pump; an
electric control valve k14 is arranged on the concentrated water making pipeline. Through the water purification system, a concentrated water remaking loop is utilized for remaking concentrated water, so that waste of
water resources is avoided;
filter element backwashing loops L1, L2 and L3, an RO
filter element forward washing loop, an RO filter element backwashing loop and an RO filter membrane backwashing loop are arranged, so that the filtering function is guaranteed, the service life is prolonged, beneficial effects are remarkable, and application and popularization are facilitated.