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Seawater desalinizing technology deeply treated by reverse osmosis membrane after mixing wastewater with seawater

A reverse osmosis membrane, advanced treatment technology, applied in seawater treatment, osmosis/dialysis water/sewage treatment, general water supply saving, etc., can solve the problems of low investment cost, low operation cost, small land occupation, etc. The effect of reducing energy consumption and reducing concentration

Inactive Publication Date: 2012-10-03
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process mixes the wastewater discharged up to the standard with seawater and then uses reverse osmosis (RO) membrane for advanced treatment. Solve the problems of high energy consumption of SWRO and the advanced treatment and recycling of wastewater, and realize energy saving and emission reduction

Method used

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  • Seawater desalinizing technology deeply treated by reverse osmosis membrane after mixing wastewater with seawater
  • Seawater desalinizing technology deeply treated by reverse osmosis membrane after mixing wastewater with seawater
  • Seawater desalinizing technology deeply treated by reverse osmosis membrane after mixing wastewater with seawater

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The mixing ratio of wastewater and seawater is 1:1, 1:2 or 1:3. Such as figure 1 As shown, seawater and wastewater pretreatment are separated: seawater passes through seawater intake pumps and seawater pretreatment equipment (including seawater primary and secondary pretreatment devices) in sequence, and wastewater passes through wastewater transfer pumps and wastewater pretreatment equipment in sequence, and will undergo pretreatment. After the seawater is mixed with the pre-treated up-to-standard wastewater, it enters the reverse osmosis raw water tank, passes through the booster pump and the security filter, and then splits, and part of it enters the reverse osmosis desalination unit (reverse osmosis membrane) through the high-pressure pump, and the reverse osmosis membrane module It is composed of several membrane elements connected in series. The other part goes through an energy recovery device that recovers the energy of high-pressure concentrated water, enters the...

Embodiment 2

[0023] The mixing ratio of wastewater and seawater is 1:1, 1:2 or 1:3. Such as figure 2 As shown, seawater and wastewater are mixed first and then pretreated: seawater passes through the seawater intake pump, and the wastewater passes through the wastewater transfer pump. The seawater and wastewater enter the mixing tank for mixing, and then enter the mixing pretreatment equipment. The pretreated seawater and wastewater are mixed water. Into the reverse osmosis raw water tank, after passing through the booster pump and security filter, one part enters the reverse osmosis seawater desalination unit (reverse osmosis membrane) through the high pressure pump. The reverse osmosis membrane module is composed of several membrane elements in series, and the other part is recycled The energy recovery device for high-pressure concentrated water energy enters the reverse osmosis membrane through the pressure lift pump, and is filtered by the reverse osmosis membrane. After the product wa...

Embodiment 3

[0024] Example 3. Calculation and analysis

[0025] according to figure 1 or figure 2 The process shown has been simulated by software to simulate a 10,000-ton level seawater desalination project. The entire system is divided into two sets, each with a daily output of 5,000 tons of fresh water, that is, a water output of 208m 3 / h, the operating temperature is 15°C, and the device runs stably. Among them, reverse osmosis desalination (SWRO) feedwater pretreatment technology includes traditional water treatment processes such as disinfection, coagulation / flocculation, clarification, and multi-media filtration, and new water treatment processes such as membrane methods. Membrane pretreatment technologies mainly include microfiltration ( MF), ultrafiltration (UF) and nanofiltration (NF), etc. The main power consumption of the new and old seawater desalination process is calculated and analyzed.

[0026] 1. Simulation analysis with Dow reverse osmosis calculation software ROSA8.0

[...

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Abstract

The invention relates to a seawater desalinizing technology deeply treated by a reverse osmosis membrane after mixing wastewater with seawater. The technology comprises the following steps of: mixing the wastewater which is discharged in accordance with standard with the seawater according to a certain proportion, and pretreating or mixing after the wastewater and the seawater are respectively pretreated, charging into a reverse osmosis membrane raw water box, flowing in a branching way through a booster pump and a cartridge filter, wherein one part of water enters into the reverse osmosis membrane through a high-pressure pump, and the other part of water enters into the reverse osmosis membrane through an energy recovering device which recovers the energy of high-pressure concentrated water and the booster pump, and filtering by the reverse osmosis membrane, so that the produced water enters into a reverse osmosis through production water box, to achieve the reuse standard, and can be taken as softened water or water for a boiler. The technology integrates the conventional reverse osmosis seawater desalinizing technology with the wastewater deep-treatment technology, so that the seawater temperature can be properly improved, the seawater salinity can be reduced, the recovery rate of produced water can be increased, the energy consumption of the high pressure pump can be reduced, the seawater desalinizing cost can be reduced, the wastewater resource can be recycled, and the difficulty of the shortage of water resources can be effectively remitted.

Description

Technical field: [0001] The present invention relates to industrial waste water, domestic sewage reverse osmosis (RO) membrane advanced treatment technology and reverse osmosis seawater desalination (SWRO) technology, in particular to the recycling and utilization of industrial wastewater in coastal areas and SWRO energy-saving technology, namely a A seawater desalination process in which wastewater and seawater are mixed and treated with reverse osmosis membranes. Background technique: [0002] With the rapid development of industry, shortage of fresh water resources and energy, environmental problems have become increasingly serious, affecting the development of the national economy. At present, the state is vigorously supporting desalination, advocating energy conservation, emission reduction and environmental protection. [0003] Ocean water accounts for 96.15% of the total global water reserves, and nearly 70% of humans live in places less than 120 kilometers away from the se...

Claims

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Application Information

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IPC IPC(8): C02F1/44C02F103/08
CPCY02A20/131
Inventor 高学理李赛赛王智
Owner OCEAN UNIV OF CHINA
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