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Water processing method and device thereof of seawater desalination system

A water treatment and dosing device technology, applied in seawater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of unreported reverse osmosis membrane scaling and achieve enhanced anti-scaling capacity, reduce production cost, and improve the effect of recovery rate

Active Publication Date: 2014-02-26
ZHEJIANG THINK ENERGY TECH
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Problems solved by technology

[0003] CN1319878C (2007-6-6) discloses a method and equipment for desalination of seawater, which treats reverse osmosis water through a nanofilter, but the equipment does not report how to reduce the fouling of the reverse osmosis membrane

Method used

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  • Water processing method and device thereof of seawater desalination system

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Embodiment Construction

[0036] Such as figure 1 As shown, the specific process flow is: raw water tank → raw water pump → (sodium hypochlorite) → self-cleaning filter → ultrafiltration water pump → ultrafiltration device → ultrafiltration product water tank → primary booster pump → (reducing agent, scale inhibitor, Acid) → primary security filter → seawater high pressure pump → seawater RO device → seawater RO production water tank → secondary RO booster pump → (alkali) → secondary security filter → secondary reverse osmosis device → secondary reverse osmosis production Water tank→Outgoing water pump→Follow-up treatment point.

[0037] During treatment, add alkaline chemicals to seawater for pre-coagulation and clarification, and then pressurize through the raw water pump to enter the filter with a filtration accuracy of less than 200 μm and a backwashing water volume of more than 25m 3 / h to clean the filter to remove large particle size impurities; the product water after removal of large particle...

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Abstract

The invention relates to a water processing method and a device thereof, and especially relates to a water processing method and a device thereof of a seawater desalination system. The method comprises the following steps: adding an alkaline agent into seawater to carry out a preset coagulating and clarifying treatment, then pumping the seawater into a cleaning and washing device through a raw water pump; carrying out a pretreatment for the produced water by adopting an external pressure type ultrafiltration membrane component; adding sodium hypochlorite during the ultrafiltration process and / or the backwashing process; pumping the produced water, which has been subjected to the ultrafiltration process, to orderly go through a safeguard filter, a primary high-pressure pump, a scale inhibitor feeding device, and a primary reverse osmosis device, wherein a scale inhibitor is added into the water in the primary reverse osmosis device to carry out a primary reverse osmosis treatment, and acid and sodium bisulfite are added at the same time in order to protect the reverse osmosis membrane; adjusting the pH value of the primary reverse osmosis produced water, making the produced water orderly go through a secondary safeguard filter, a secondary high-pressure pump, and a secondary reverse osmosis device to carry out a secondary reverse osmosis treatment, subjecting the reverse osmosis condensed water to an energy recovery treatment; and finally subjecting the secondary reverse osmosis produced water to subsequent treatments. The reverse osmosis membrane provided by the invention has the advantages of difficulty in scaling and high seawater desalination recovery rate.

Description

technical field [0001] The invention relates to a water treatment method and its device, in particular to a seawater desalination system water treatment method and its device. Background technique [0002] In seawater desalination, existing reverse osmosis seawater desalination devices mainly include seawater pretreatment installations and good water reverse osmosis desalination devices. Pretreatment devices generally include flocculation + sedimentation / flotation tanks, filter tanks / device, dosing systems, etc.; reverse osmosis devices mainly include security filters, high-pressure pumps, energy recovery devices, and reverse osmosis membrane components. However, due to the strict pretreatment requirements of reverse osmosis, it is difficult for the existing pretreatment technology to meet the requirements of reverse osmosis influent, and it is very easy to cause fouling of the reverse osmosis membrane, which shortens the service life of reverse osmosis, and reverse osmosis ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/08
CPCY02A20/131
Inventor 顾翀翀
Owner ZHEJIANG THINK ENERGY TECH
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