Industrialized Technique for sea water desalination and pretreatment

A process method and pretreatment technology, applied in seawater treatment, flocculation/sedimentation water/sewage treatment, sterilization/microdynamic water/sewage treatment, etc. The effect of preventing the reduction of drug efficacy and improving the precipitation efficiency

Inactive Publication Date: 2008-04-23
天津欧纳海洋科技发展有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although the above-mentioned technologies have been applied in many countr

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  • Industrialized Technique for sea water desalination and pretreatment

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Embodiment 1

[0031]The seawater from the natural sedimentation tank is lifted by the seawater lift pump, mixed with the flocculant (polyferric sulfate) measured by the metering pump from the dosing system in the jet, and then enters the three-stage mechanical stirring flocculation reaction ramp sedimentation tank, the flocculant The amount added is 30mg / L. The fungicide is metered by the metering pump and directly poured into the mechanical stirring mixing tank, and the amount of the fungicide added is 4mg / L. The stirring speed of the mixing tank is 165r / min, the stirring speed of the flocculation tank is 40r / min and 18r / min respectively, and the total residence time of the mixing flocculation tank is 25min. The residence time of the inclined plate sedimentation tank is 30 minutes, and the mud discharge time is 10 hours. The supernatant of the inclined plate sedimentation tank overflows to the air flotation tank, and the effluent of the air flotation tank overflows the gravity sand filter...

Embodiment 2

[0033] The seawater from the natural sedimentation tank is lifted by the seawater lift pump, mixed with the flocculant (ferric chloride) measured by the metering pump from the dosing system in the jet, and then enters the three-stage mechanical agitation flocculation reaction inclined plate sedimentation tank, flocculation Dose addition is 40mg / L. The fungicide is metered by the metering pump and directly poured into the mechanical stirring mixing tank, and the amount of the fungicide added is 5mg / L. 1. The stirring speed of the mixing tank is 180r / min, the stirring speed of the flocculation tank is 50r / min and 15r / min respectively, and the total residence time of the mixing flocculation tank is 20min. The residence time of the inclined plate sedimentation tank is 25 minutes, and the mud discharge time is 12 hours. The supernatant of the inclined plate sedimentation tank overflows to the purified seawater storage tank. Product water turbidity 40.3%. See Figure 2.

Embodiment 3

[0035] The seawater from the natural sedimentation tank is lifted by the seawater lift pump, mixed with the flocculant (polyferric sulfate) measured by the metering pump from the dosing system in the jet, and then enters the three-stage mechanical stirring flocculation reaction ramp sedimentation tank, the flocculant The amount added is 25mg / L. The fungicide is metered by the metering pump and directly poured into the mechanical stirring mixing tank, and the amount of the fungicide added is 3mg / L. 1. The stirring speed of the mixing tank is 150r / min, the stirring speed of the flocculation tank is 35r / min and 12r / min respectively, and the total residence time of the mixing flocculation tank is 30min. The residence time of the inclined plate sedimentation tank is 40 minutes, and the mud discharge time is 18 hours. The supernatant of the inclined plate sedimentation tank overflows to the gravity sand filter. The turbidity of sand filter effluent is less than 1.5NTU, and the rem...

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Abstract

This invention relates to pretreatment of sea-water for commercial desalination. In this invention, the seawater from natural sedimentation tank is pumped, and mixed with flocculent which is from flocculent tank and being after meterage by proportioning pump, into a three-step, mechanical agitation, flocculation reaction, tilted plate separator. And bacteriacide, after meterage by proportioning pump, is direct pumped into a mechanical agitating mixing pound. After mixing, flocculation, it overflows into said tilted plate separator. The upper clear liquid overflows into seawater storage tank for further purification. The waste sludge in the bottom of the tilted plate separator is discharged periodically. This invention provides a pretreatment of seawater for commercial desalination which overcomes the prior art shortcomings, with advantages of: simple process, easy operation and low cost.

Description

technical field [0001] The invention relates to seawater desalination technology, in particular to a pretreatment process for industrialized seawater desalination. The seawater is purified through sterilization, flocculation, sedimentation, filtration and other units. The purified seawater can be used in desalination, industrial circulation cooling, landscape water, agricultural irrigation water, aquaculture water and other industries. Background technique [0002] 96.5% of global water resources are marine salt water, only 3.5% are fresh water; while 2.5% of fresh water is polar plains, only 1% is available for human use. Thereby asking the sea for fresh water becomes the only hope to solve the shortage of water resources. [0003] my country is one of the 13 countries in the world that suffer from severe water shortage, and the per capita fresh water in the country is only 1 / 4 of the world per capita. Since the 1970s, most coastal countries have joined the development tr...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/50C02F103/08
Inventor 马敬环
Owner 天津欧纳海洋科技发展有限公司
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