Minitype sea water desalination system water treatment technique

Abstract

The invention provides a water treatment technique of a small-sized sea water desalination system, which includes the following steps: step 1, causing the sea water to enter a primary filter via a booster pump to remove big particle size foreign material, step 2, employing two parallel filters to further remove the foreign material with the particle size bigger than 100mu m, the water inlets of the two filters are equipped with electric triple valve, according to the designed backwash time sequence of a ultrafiltration device, alternately self-backwashs the two filters via the adjustment of the electric triple valves, step 3, the outlet water from the self-backwash filter is treated by the ultrafiltration device and the SDI value is equal or smaller than 3, which reaches the need of reverse osmosis well water, step 4, the ultrafiltration water enter reverse osmosis components to be treated via the pressure boost, the filtration of the security filter and the water pressure lift to theneed of the water inlet pressure of the reverse osmosis components by a high pressure pump, recycle the energy of the reverse osmosis water and the recycled energy is used for the work of the high pressure pump. The invention has the advantages of simple device, low cost, easy replacement and low energy consumption and operation cost.

Description

Technical field [0001] The invention relates to a small-scale seawater desalination process. Background technique [0002] With the continuous advancement of seawater desalination technology, the demand for fresh water from the sea to alleviate the increasingly serious global water crisis has not only formed a consensus in the global scientific and technological community, but has also become a countermeasure for the governments of various coastal countries to advocate and develop new water sources. Currently, 124 countries and regions in the world apply seawater desalination technology. Research and development of seawater desalination technology is still in the ascendant. [0003] At present, the water quality of the surrounding seawater in my country's coastal areas (including islands) is not optimistic, especially due to the influence of continental rivers, the turbidity in the seawater is high. The conventional seawater desalination process uses inclined plate precipitation ...

AI Technical Summary

Problems solved by technology

The conventional seawater desalination process uses slanted plate sedimentation and quartz sand filtration as pretreatment. Although seawater can be treated to meet the influent requirements of the membrane treatment unit, it occupies a large area and the equipment is cumbersome

[0004] On the other hand, power consumption is an important factor restricting the application and promotion of seawater desalination systems

At present, there are mainly two types of energy recovery devices commonly used in seawater desalination systems. One is the turbine energy recovery process, which has a relatively low efficiency, generally between 35-76%; the other is the positive displacement energy recovery process. The recovery efficiency of the process is between 91-96%, but the equipment configuration is complicated, and the work requirements for operation and maintenance are high

[0005] To sum up, the current seawater desalination process is complex, resulting in bulky equipment and high energy consumption for desalination, which is not suitable for the miniaturized seawater desalination treatment of my country's coastal seawater.

Images