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Brackish water desalination method and brackish water desalination device

A technology of brackish water desalination and reverse osmosis device, which is applied in the field of brackish water desalination method and its device, can solve the problems of low recovery rate of produced water, poor health and drinkability, high production cost, etc., and achieve stable water quality and small Low energy consumption and low operating costs

Inactive Publication Date: 2014-07-23
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem solved by the present invention is to provide a brackish water desalination method and device for brackish water softening pretreatment with ultra-low pressure, low energy consumption, large flux, high ion selectivity and loose nanofiltration membrane elements , this method effectively solves the high production cost caused by the large amount of chemical agents added in the existing membrane-based brackish water desalination process, the poor economy caused by the low recovery rate of product water and the lack of deep post-treatment of product water. poor health and drinking

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  • Brackish water desalination method and brackish water desalination device

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Effect test

Embodiment 1

[0031] refer to figure 1 , the selected brackish water has a salt content of 1.0-3.0g·L ?1 The specific steps include: start the booster pump, pump the feed water in the raw water tank into the self-cleaning laminated filter and ultrafiltration device in turn, because the underground brackish water has naturally passed through the filtration of the porous medium (sandy, clay and rocky, etc.), many particulate matter and some organic matter in the feed water are removed. The high-precision self-cleaning laminated filter device removes suspended particle colloids and algae with a particle size > 20 μm in the raw water. The ultrafiltration device adopts a cross-flow operation mode to ensure that the recovery rate of the ultrafiltration product water is ≥ 95%, in order to maximize the water production of the system. The recovery rate offers the possibility that the ultrafiltration product water SDI 15 <2.0, turbidity <0.01NTU, the molecular weight cut-off of the ultrafiltration ...

Embodiment 2

[0034] refer to figure 1 , keep the reverse osmosis inlet water pressure at 4.5MPa, and keep the reverse osmosis concentrated water flow at 800 L h -1 Unchanged, the reverse osmosis device has no effect on Ca in brackish water 2+ , Mg 2+ , SO 4 2? 、HCO 3 ? The rejection rates of , TDS and total hardness are 98.8%, 99.1%, 99.3%, 94.7%, 99% and 99.3% respectively, the pressure drop of a single reverse osmosis membrane is less than 0.1Mpa, and the concentrated reverse osmosis water directly enters the high ion selectivity Nanofiltration device, the operating pressure of the nanofiltration membrane is maintained at 1.7MPa, the recovery rate of the nanofiltration product water is 60%, and the nanofiltration device is non-alkaline scale-forming anion SO 4 2? The rejection rates of TDS and TDS are 98.3% and 22.8%, respectively, and the rejection rate of monovalent salts such as sodium chloride and potassium chloride is 15.9%. ?1 , The system water recovery rate of the reverse...

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Abstract

The invention discloses a brackish water desalination method and a brackish water desalination device. The essential of the technical scheme of the invention is as follows: the brackish water desalination method comprises the steps of cleaning and filtering treatment, ultrafiltration treatment, pressurization treatment, reverse osmosis desalination treatment, reverse osmosis thick-water nanofiltration softening treatment, nanofiltration thick-water energy recovery treatment, nanofiltration thick-water ultrafiltration backwash treatment, ultrafiltration backwash wastewater drainage treatment, product water mineralization and carbonation treatment, product water sterilization and taste improvement treatment, purified water drainage and the like. The invention further discloses a brackish water desalination device. According to the brackish water desalination method and the brackish water desalination device disclosed by the invention, the problems of high production cost brought by addition of lots of chemical agents, low economical efficiency brought by low product water recovery rate, low health drinking performance brought by no deep aftertreatment on product water, and the like in the existing membrane-method brackish water desalination process are effectively solved.

Description

technical field [0001] The invention belongs to the field of brackish water desalination technology, and in particular relates to a brackish water desalination method and a device thereof. Background technique [0002] In the global water balance, groundwater brackish water accounts for more than half of groundwater resources, and this type of unconventional water resource is considered to be a potentially important alternative source of drinking water in the near future. Statistics show that in the drinking proportion of unconventional water desalination, seawater desalination, brackish water desalination and wastewater retreatment accounted for 58%, 22% and 5% of the total utilization respectively. In the vast inland areas, actively promote the development and utilization of unconventional water resources such as brackish water and brackish water, and improve the utilization efficiency of water resources, which can effectively increase the supply of new water resources und...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCY02A20/131
Inventor 宋跃飞周建国李铁梅
Owner HENAN NORMAL UNIV
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