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Potassium hypermanganate and chloride united controlled milipore filter algae pollution pretreating method

A technology of potassium permanganate and joint control, applied in the field of water treatment, can solve the problems of high ozone construction cost and equipment investment, affecting the safety of drinking water, unsuitable for emergency treatment, etc., to improve the algae removal rate and reduce self-use water consumption , the effect of reducing infrastructure investment

Inactive Publication Date: 2008-10-29
HARBIN INST OF TECH
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Problems solved by technology

Pre-chlorination is a widely used pre-oxidation algae killing method, but the disinfection by-products and smell problems caused by high doses of chlorine affect the safety of drinking water; copper sulfate algicide will cause algae toxin leakage and copper secondary The problem of pollution; the capital construction cost and equipment investment of ozone are high, so it is not suitable for emergency treatment when the algae in the reservoir water is high; potassium permanganate also has the problem of weak algae killing ability

Method used

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  • Potassium hypermanganate and chloride united controlled milipore filter algae pollution pretreating method

Examples

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Effect test

Embodiment 1

[0016] Add potassium permanganate and chlorine to the algae-containing water in the reservoir, the dosage of potassium permanganate is 0.3-2 mg / l, and the dosage of chlorine is 0.2-3 mg / l. The combination of the two can achieve a better treatment effect. Under different dosage ratios, they all have better algae removal effects. Compared with pre-chlorination alone, the removal rate of organic matter can be increased by more than 20%. Iron and The removal rate of manganese is increased by more than 30%, and the removal rate of algae is increased by more than 40%.

Embodiment 2

[0018] Add potassium permanganate and chlorine to the algae-containing water. The dosage of potassium permanganate is 0.3-2mg / l, and the dosage of chlorine is 0.2-3mg / l. The two oxidants are added at the same time, and then Add the coagulant basic aluminum chloride 1-10mg / l, after the pipeline is quickly mixed, after 5-10 minutes of flocculation reaction, the supernatant is pumped into the ultrafiltration membrane by the lifting pump, and passes through the cross-flow filtration of the ultrafiltration membrane module , The reflux ratio is controlled at 80-90%. The ultrafiltration membrane used is a hollow fiber structure made of organic synthetic material. During operation, the operating pressure of the ultrafiltration membrane is 0.05-0.2MPa, the backwash cycle is 45-120 minutes, and the backwash intensity is 200-300L / m 2 h, the backwashing time is 30-90 seconds. Compared with pre-chlorination alone, the ultrafiltration membrane backwash cycle can be extended by 15 to 45 mi...

Embodiment 3

[0020] The difference between this example and Example 2 is that the coagulant used is ferric chloride, the dosage is 3-15 mg / l, the flocculation reaction time is 10-20 minutes, and the reflux ratio is controlled at 80-95 %. The backwashing time is 30 to 120 seconds. Compared with pre-chlorination alone, the ultrafiltration membrane backwash cycle can be extended by 20 to 45 minutes, the removal rate of organic matter, iron, and manganese can be increased by more than 20%, and the removal rate of ultrafiltration membrane influent algae can be increased by more than 45%. Others are identical with embodiment 2.

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Abstract

The invention provides a pretreating method of controlling algae pollution of ultra filtration membrane by potassium permanganate and chlorine, simultaneously casting two oxidants of potassium permanganate and chlorine into the algae containing water of a reservoir in 0.3-2mg / l and 0.2-3mg / l, respectively, quickly mixing and making flocculation reaction for 5-20 min, pumping supernatant into the ultra filtration membrane, and obtaining drinking water by alternating flow filtration of membrane component. And it improves algae removing effect by adsorption and codeposition, thus reducing algae quantity entering the ultra filtration membrane and effectively controlling algae pollution of ultra filtration membrane. And it can control frequency of chemically cleaning ultra filtration membrane and effectively prolong the service life of ultra filtration membrane.

Description

technical field [0001] The invention relates to a water treatment method, in particular to a water treatment method for preventing membrane fouling. Background technique [0002] Due to the impact of industrial pollution and farmland runoff, a large amount of pollutants enter the reservoir water, leading to the reproduction of algae and forming a vicious circle of eutrophication. High-algae water brings greater difficulty to conventional treatment processes, often causing problems such as algae penetration, filter blockage, algal toxin leakage, disinfection by-products, and odor. Ultrafiltration membrane separation technology has the advantages of energy saving, simplicity, easy operation and reduced floor space, so it has broad application prospects in the water treatment industry. However, since the ultrafiltration membrane is capable of retaining all algae, the algae quickly clogs the ultrafiltration membrane in a relatively short period of time. The literature shows th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/76C02F1/72B01D61/16B01D61/22B01D65/08
Inventor 梁恒杨艳玲公维佳李圭白
Owner HARBIN INST OF TECH
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