Method for purifying liquid and system for the implementation thereof
The present liquid purification method, carried out with the aid of a liquid purification system, includes a three-stage liquid filtration cycle, during which all of the drain liquid can be continuously fed back into the purification system until the liquid filtration cycle is complete. During this continuous recycling, a high liquid flow rate is maintained, and the feed rate of the liquid can be controlled during the continuous mixing of initial liquid and drain liquid. The common aim of this subject matter and the technical result achieved in the use of same is the development of a novel energy-efficient method and system for purifying liquids which makes it possible to improve the energy-efficiency of liquid purification while simultaneously increasing the degree of purification and the extent to which the initial liquid is used.
1 . A method for purifying a liquid in a pneumatically-started liquid filtration cycle with recirculation having a first stage, a second stage, and a third stage, the method comprising:
in the first stage, filling a raw liquid container being a part of a liquid recirculation unit included in a liquid purification unit, wherein the raw liquid container is filled with a raw liquid comprising raw water,
in the second stage after the first stage, using a pressure generation means disposed outside of the raw liquid container to impart a compressed gas energy to the liquid recirculation unit including to the raw liquid container, and said compressed gas energy establishes a liquid recirculation unit pressure sufficient for moving the raw liquid to a filtration unit of the liquid purification unit, the filtration unit using a liquid circulation means to move the raw liquid at a velocity to at least one fine liquid purification device configured to purify the raw liquid and thereby produce drain liquid,
in the third stage, returning the drain liquid into the raw liquid container using the liquid circulation means via a recirculation line from the at least one fine liquid purification device continuously during filtering of the raw liquid for mixture with the raw liquid in the raw liquid container;
removing residual drain liquid from the raw liquid container via a drain line due to the compressed gas energy, wherein completion of the third stage is followed immediately by repetition of the liquid filtration cycle of the first stage;
wherein the imparting the compressed gas energy further comprises transmitting energy from a compressed gas or compressed gas in a liquid mixture through at least a gas and liquid-impermeable partition of the raw liquid container via pressure applied to the gas and liquid-impermeable partition by the compressed gas or compressed gas in a liquid mixture.
2 . The method for purifying the liquid according to claim 1 , further comprising receiving at least more than half of the raw liquid to be processed at the recirculation unit at the first stage of the liquid filtration cycle prior to an initial imparting of the compressed gas energy.
3 . The method for purifying the liquid according to claim 1 , further comprising carrying out the second stage of the liquid filtration cycle with continuous recirculation while maintaining a liquid flow velocity so as to control a rate of supplying the liquid into the liquid filtration unit from the liquid recirculation unit while the drain liquid is directly supplied under pressure through the recirculation line to the raw liquid container from the liquid filtration unit while simultaneous stirring of the raw liquid and the drain liquid.
4 . The method for purifying the liquid according to claim 1 , further comprising recovering a system energy from the compressed gas or compressed gas and liquid mixture energy at the third stage of the liquid filtration cycle.
5 . The method for purifying the liquid according to claim 1 , further comprising reverse washing a fine liquid purification device at the third stage of the liquid filtration cycle.
6 . The method for purifying the liquid according to claim 1 , further comprising performing a mineralization process.
7 . A liquid purification system comprising:
a liquid purification unit comprising:
at least one recirculation unit comprising a raw liquid container, a recirculation line, and a system of valves, and
a filtration unit comprising at least one fine liquid purification device configured to purify raw water and a liquid circulation means,
a line for supplying fluid comprising the raw water from the raw liquid container to the at least one fine liquid purification device,
a pure liquid unit,
a pressure generation means disposed outside of the raw liquid container and for generating a pressure using a compressed gas energy to pressurize the raw liquid container to move the fluid from the raw liquid container to the filtration unit during a second stage of a three-stage liquid filtration cycle, and
the liquid circulation means for moving the fluid to the at least one fine liquid purification device and for generating a recirculation unit pressure that pressurizes the recirculation line to move drain liquid from the at least one fine liquid purification device to the raw liquid container during the second stage of the three-stage liquid filtration cycle,
wherein the liquid purification unit is configured to perform the three-stage liquid filtration cycle and to return the drain liquid into the raw liquid container prior to completion of the liquid filtration cycle with continuous recirculation while maintaining a liquid flow velocity so as to control a rate of supplying the fluid into the liquid filtration unit from the liquid recirculation unit while the drain liquid is directly supplied under pressure through the recirculation line to the raw liquid container from the at least one fine liquid purification device while simultaneous stirring of the raw water and the drain liquid within the raw liquid container,
wherein the raw liquid container is configured to remove the drain liquid from the raw liquid container using the compressed gas or compressed gas and liquid mixture energy at a third stage of the cycle, and is further configured to convert a system energy into the compressed gas or compressed gas or liquid mixture energy at the third stage of the cycle,
wherein the raw liquid container comprises a gas- and liquid-impermeable partition disposed such that the compressed gas or compressed gas and liquid mixture energy is transmitted to the system through the gas- and liquid-impermeable partition, and through which further conversion of a system energy into the compressed gas or compressed gas and liquid mixture energy occurs during the third stage of the filtration cycle.
8 . The liquid purification system according to claim 7 , wherein the liquid purification unit includes at least two recirculation units.
9 . The liquid purification system according to claim 7 , wherein the pressure generation means is configured to generate a pressure in the recirculation unit using a compressed gas and liquid mixture energy.
10 . The liquid purification system according to claim 7 , wherein the gas- and liquid-impermeable partition comprises an elastic diaphragm.
11 . The liquid purification system according to claim 7 , wherein the raw liquid container is configured to provide a flow-through movement of the liquid.
12 . The liquid purification system according to claim 7 , wherein the raw liquid container further comprises an adjustable restrictor.
13 . The liquid purification system according to claim 7 , wherein the system of valves is configured to direct a compressed gas or compressed gas and liquid mixture flow at a first stage of the liquid filtration cycle from an output of the pressure generation means to the raw liquid container included in the recirculation unit.
14 . The liquid purification system according to claim 8 , wherein the system of valves is configured to direct a compressed gas or compressed gas and liquid mixture flow from the raw liquid container being a part of one recirculation unit to the raw liquid container being a part of another recirculation unit.
15 . The liquid purification system according to claim 7 , wherein the fine liquid purification device comprises a nanofiltration device.
16 . The liquid purification system according to claim 7 , wherein the recirculation line included in the liquid recirculation unit further comprises at least one filtration device.
17 . The liquid purification system according to claim 7 , wherein the raw liquid unit further comprises at least one prefilter.
18 . The liquid purification system according to claim 7 , wherein the pure liquid unit further comprises at least one postfilter comprising at least one of sorption materials or an additional liquid preparation unit.