Low-yield single-pump two-stage reverse osmosis system

A two-stage reverse osmosis and reverse osmosis technology, applied in reverse osmosis, osmosis/dialysis water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of long-term stability of water quality, low recycling rate, and economic benefits No obvious problems, etc., to achieve stable and rapid water quality, improve water quality, and reduce consumption costs

Inactive Publication Date: 2014-03-12
岳勇斌
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Problems solved by technology

[0003] 1) When dealing with water sources with high salinity, the desalination rate of the single-stage RO system cannot guarantee a sufficient desalination rate-based on the desalination characteristics of the reverse osmosis membrane itself, the removal rate is the standard, and the salt content of the produced water will also be With the increase of the salinity of the influent water, it will increase accordingly. When a certain index is fixed, the established conductivity standard of the product water will not be reached; because the salt content (ion concentration) of the product water quality is still high, if the later stage needs to be carried out Deep purification, such as using ion exchange methods, will also directly reduce the treatment capacity and service life of ion exchange resins;
[0004] 2) The stability of the product water quality is not good - the product water quality of the single-stage reverse osmosis system is affected by many factors such as pressure, temperature and pH at the same time. Once the conditions fluctuate, the product water quality will fluctuate rapidly and it will take longer Stablize;
[0006] 1) The recovery rate is not high - because the two-stage reverse osmosis is designed to use the product water of the first-stage reverse osmosis membrane (usually the recovery rate of a single

Method used

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  • Low-yield single-pump two-stage reverse osmosis system

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Embodiment Construction

[0038] Such as figure 1 The shown small output single-pump double-stage reverse osmosis system includes a connected first-stage reverse osmosis membrane and a second-stage reverse osmosis membrane.

[0039] The tap water (flow ≥ 1.8LPM, pressure ≥ 1 bar) after pretreatment (usually 5um polypropylene fiber winding filter element + granular activated carbon filter element within the validity period) passes through the water source pressure sensor switch (low pressure switch) and water inlet solenoid valve in sequence . Then it is boosted by a booster pump (flow ≥ 1.2LPM7bar) and enters a first-stage reverse osmosis membrane (output 125GPD25℃, rated working pressure 50-60psi, desalination rate ≥96%).

[0040] Install a first-stage pressure gauge on the concentrated water outlet pipe of the first-stage reverse osmosis membrane, and then connect it to a first-stage wastewater proportional valve (adjustable or fixed, kv=0.6LPM), which is connected in parallel with a flushing soleno...

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Abstract

The invention relates to a low-yield single-pump two-stage reverse osmosis system. Pretreated running water is connected with a first-stage reverse osmosis membrane through a first-stage booster pump. A concentrated water outlet pipeline of the first-stage reverse osmosis membrane is sequentially and serially connected with a first-stage pressure gauge and a first-stage waste water proportional valve. The first-stage waste water proportional valve is in parallel connection with a washing electromagnetic valve and then connected with a concentrated water outlet. A pure water outlet pipeline of the first-stage reverse osmosis membrane is sequentially and serially connected with a second-stage pressure gauge and a one-way valve A and then connected with a water inlet of a second-stage reverse osmosis membrane. Waste water of the second-stage reverse osmosis membrane flows back to a water inlet of the booster pump through a second-stage proportional valve. A second-stage pure water outlet pipeline of the second-stage reverse osmosis membrane is sequentially and serially connected with a water quality monitoring instrument and a producing water quality control valve. By employing the low-yield single-pump two-stage reverse osmosis system, producing water quality can reach standards fast, long-term stability of the producing water quality is achieved, recovery reaches at least 20%, complex pretreating processes are not needed, salt removing rate can stably reach more than 99%, and double reduction of producing cost of ultrapure water produced by using DI (desorption ionization) (ion exchange) as post-stage purification.

Description

technical field [0001] The invention relates to a small-scale water purification system, in particular to a water purification system of ≤10L / H25°C. Background technique [0002] Existing small-scale water purification systems widely use reverse osmosis technology in the primary purification stage. Considering the structural space, cost and design difficulty of small-scale systems, single-stage reverse osmosis (single-stage RO) technology is widely used at present, and the application of this technology is the same It can achieve the purpose of removing more than 90% of inorganic ions, organic matter and particles, but there are the following disadvantages: [0003] 1) When dealing with water sources with high salinity, the desalination rate of the single-stage RO system cannot guarantee a sufficient desalination rate-based on the desalination characteristics of the reverse osmosis membrane itself, the removal rate is the standard, and the salt content of the produced water ...

Claims

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Application Information

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IPC IPC(8): C02F9/02B01D61/08C02F1/44
Inventor 岳勇斌
Owner 岳勇斌
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