Seawater desalination method for integrated membrane process

An integrated membrane and seawater technology, applied in the field of water desalination, can solve problems such as high desalination rate, achieve the effect of improving electrical conductivity, process energy consumption and operation stability, and improving water conservancy

Active Publication Date: 2015-09-16
天津中领水系统技术有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a novel integrated membrane process seawater desalination process that combines nanofiltration and electrodialysis technology to adapt to low operating pressure, low energy consumption, low investment, Technical requirements such as high desalination rate

Method used

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  • Seawater desalination method for integrated membrane process
  • Seawater desalination method for integrated membrane process
  • Seawater desalination method for integrated membrane process

Examples

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Embodiment 1

[0039] For the pretreatment unit, seawater raw water 1 first enters the coagulation and sedimentation tank 2 through the action of the lift pump, and enters the sedimentation tank 3 after adding conventional coagulation and flocculation agents such as polyacrylamide for precipitation and deturbidity. Acidification adjustment is carried out to reduce the pH to between 6.5-7.0. The clean sea water is further filtered by the booster pump into the sand filter 4. The sand filter 4 is composed of two stages of sand filters connected in series. The filter medium used is quartz sand with particle sizes of 1.0-2.0mm and 0.5-1.0mm respectively. In front of the first-stage sand filter, strengthen the oxidant sodium hypochlorite to sterilize and remove algae online, and add the reducing agent NaHSO online between the second-stage sand filter and the ultrafiltration membrane 5 3 , Eliminate residual oxidants and protect downstream ultrafiltration membranes.

[0040] The clear sea water in...

Embodiment 2

[0052] In this embodiment, the operating parameters of the NF devices of the pretreatment and primary desalination units remain unchanged, and the flow and pressure conditions of the SEDR device are also the same as in Embodiment 1. Only the voltage and current of each stage of the SEDR device are changed. Reduce the desalination rate of the SEDR unit, but still maintain the salinity of the produced water within the range of better drinking water quality. The operating parameters, power consumption, and water quality parameters of the SEDR device in embodiment 2 are as shown in table 3:

[0053] Table 3 SEDR seawater desalination operating parameters and influent and effluent water quality

[0054]

[0055] Compared with Example 1, in Example 2, by appropriately reducing the operating voltage and current of each stage of the SEDR device, the fresh water conductivity is 410 μS / cm, the TDS is 241 mg / L, the desalination rate is 99.26%, and the power consumption per ton of wate...

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Abstract

The invention provides a seawater desalination method for an integrated membrane process and belongs to a water desalination technology. Aiming at the defects of high investment, high pressure, high energy consumption and the like in an existing membrane-method seawater desalination process, 'nanofiltration/electrodialysis reversal' is taken as a core desalination process, wherein during nanofiltration, a high-desalination nanofiltration membrane with desalination ratio of 90% is adopted; during electrodialysis reversal, a thin-type electrode chamber is filled with a multistage multi-section energy-saving electroosmosis device provided with mixed-bed ion exchange resin. Seawater raw water is sequentially pretreated by virtue of a coagulative precipitation tank, a settling tank, a sand filter and an ultrafiltration membrane, and then is subjected to graded desaltination sequentially by virtue of a nanofiltration desalination device with an energy recovery device, and an energy-saving frequent electrodialysis reversal device; nanofiltration and energy-saving electrodialysis are respectively performed at low operation pressures which do not exceed 3.8MPa and 0.4MPa; the salt content of water produced by the system is 80-250mg/L, the total desalinization ratio can be mechanically regulated within a range of 99-99.75%, the body power consumption of per ton of water does not exceed 2.15KWh/m<3>, the investment and energy consumption of the whole seawater desalination process are obviously reduced, and the process operation is relatively safe and stable.

Description

technical field [0001] The invention relates to a seawater desalination method, in particular to a method for desalting seawater to prepare fresh water by using a "nanofiltration / electrodialysis" integrated membrane process, which belongs to the water desalination technology. Background technique [0002] Seawater desalination, as one of the key means to solve the current global water resource problems, has received unprecedented attention worldwide. The development level and scale of China's seawater desalination industry will have an important impact on the sustainable development of economy and society. For the eastern and northern coastal water-scarce areas, it is of great significance. However, there is a glaring contradiction between the enormous need to desalinate seawater and the limitations of existing desalination technologies. [0003] The existing seawater desalination technologies are mainly traditional distillation and seawater reverse osmosis (SWRO) membrane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/08
Inventor 王建友刘红斌卢会霞李露江颖
Owner 天津中领水系统技术有限公司
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