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A two-stage closed circuit desalination system of super ro characteristics

A desalination system and closed-circuit technology, applied in the field of two-stage closed-circuit desalination system with super reverse osmosis characteristics, can solve the problems of design complexity and no practical application, and achieve the effect of good quality penetration

Active Publication Date: 2020-05-08
DESALITECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the common batch closed-circuit desalination device with continuous sequential desalination, the low-energy batch closed-circuit desalination reverse osmosis process designed above has little practical application due to its design complexity

Method used

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  • A two-stage closed circuit desalination system of super ro characteristics
  • A two-stage closed circuit desalination system of super ro characteristics
  • A two-stage closed circuit desalination system of super ro characteristics

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Embodiment Construction

[0044] The same closed-loop desalination cycle with a fixed flow rate and duration expressed by equation (9) Continuous sequential closed-circuit desalination in a fixed closed-circuit intrinsic volume design is carried out under conditions of fixed flow and variable pressure, each of a defined applied pressure and salinity of the recovered concentrate, with equation (2) expressed in the Linear permeate production on the time scale described and exponential on the recovery scale described. During the sequence, the specific energy per cycle is represented by the salinity of the permeate per cycle expressed by Equation (4) for HP, Equation (5) for CP, and Equation (5). The specific energy and permeate salinity in a closed loop desalination train correlating the cycle number and sequential average (av-SE and av-TDS) on recovery as an exponentially increasing function of cycle number and recovery same rise. According to formula (9), the number of cycles is a function of MR and...

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Abstract

A inventive two-stage batch-CCD RO system includes two separate batch-CCD units of a different number of modules per stage with more modules in the first-stage N(1)>N(2). A two-stage batch- CCD process proceeds when both units execute parallel fixed flow variable pressure desalination sequences of same operational set-points [flux, module recovery and batch sequence recovery (R)], with brine of aformer first-stage used as second-stage feed. In two-stage batch CCD RO systems of high N(1) / N(2) ratio whereby the relative production of permeates of the two stages complies to: [delta](1)>> [delta](2), most of the permeates are produced in the first-stage under mild conditions and contribute to the low energy and salinity of permeates of the entire process. Compared with the performance of a single-stage batch-CCD RO unit, a two-stage system of the same module-number will render a performance of super RO characteristics, unmatched by any existing RO methods.

Description

Background technique [0001] Variable pressure conditions [Patent No. PCT / IL2005 / 000670 (Evraty), "Continuous closed-circuit desalination device without containers (CONTINUOUS CLOSED CIRCUIT DESALINATION APPARATUS WITHOUT CONTAINERS)" and patent No. PCT / IL2004 / 000748 (Evraty ) "APPARATUS FOR CONTINUOUS CLOSED CIRCUIT DESALINATION UNDER VARIABLEPRESSURE WITH A SINGLE CONTAINER" opens up new levels of low-energy high-recovery batch desalination that can continue on a continuous sequential basis (batch desalination) the gate of craft. Closed circuit desalination (CCD) performs complete concentrate recovery from the outlet to the inlet of the module sequentially through the circulation pump (CP) component, in which the recovered concentrate passes through the pressurized feed stream generated by the high pressure pump (HP) component ( feed flow) serially diluted. Closed-loop desalination operation is performed under fixed flow and variable pressure conditions at a selected flow r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D63/12C02F1/44
CPCY02A20/131B01D61/12B01D2311/08B01D61/026B01D2311/2512B01D61/08B01D2311/25B01D2311/04B01D61/02B01D63/12C02F1/44B01D2317/022B01D61/025C02F2103/06C02F2103/007C02F2209/03C02F2209/05C02F2209/40C02F2301/08B01D2311/14B01D2311/16B01D2313/243C02F1/441
Inventor 阿维·埃夫拉蒂
Owner DESALITECH
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