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Treatment method of feedwater raw water

A treatment method and raw water technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problem of reduced turbidity removal effect of raw water, powerlessness, high ammonia nitrogen, etc. question

Inactive Publication Date: 2014-03-05
TIANJIN POLYTECHNIC UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

At the same time, in the face of changes in water quality (in addition to the original sediment, colloidal substances and pathogenic microorganisms, there are also organic pollutants, high ammonia nitrogen, disinfection by-products, water quality biological stability, etc.), conventional drinking water treatment processes (only It can remove 20-30% of organic matter in water, and due to the existence of dissolved organic matter, it is not conducive to destroying the stability of the colloid, so that the removal effect of the turbidity of the raw water by the conventional process is also significantly reduced, only 50-60%) has become insufficient

Method used

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  • Treatment method of feedwater raw water

Examples

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Embodiment 1

[0011] The modified polysilicate microgel flocculant is prepared by the following method:

[0012] Under high-speed stirring conditions, 200kg of sodium silicate with a silicon dioxide concentration of 2wt% was added to 80ppm of silicon dioxide powder, and vigorously stirred in a drum stirring device to keep the Reynolds number of the liquid during the stirring process at 10000, and then use The dilute sulfuric acid with a concentration of 20wt% by weight is acidified until the pH of the solution is 10, and the instant viscosity of the mixed solution measured by an online viscometer is 20 mPa.

[0013] The raw water is lake water with a turbidity of 10-15NTU, a pH of 7.2, and a water temperature of 14°C. Add raw water into milk of lime, adjust the pH value at 8.5, then add the liquid obtained by mixing sodium silicate and sulfuric acid through a high-speed stirrer, and add sewage at a ratio of 0.05wt%, keep the instant viscosity of the mixed solution less than 50mPa·S, and mai...

Embodiment 2

[0019] The modified polysilicate microgel flocculant is prepared by the following method:

[0020] Under high-speed stirring conditions, 400kg of sodium silicate with a silicon dioxide concentration of 4wt% was added to 150ppm of silicon dioxide powder, and vigorously stirred in a drum stirring device to keep the Reynolds number of the liquid during the stirring process at 12000, and then use The dilute sulfuric acid with a concentration of 20wt% was acidified until the pH of the solution was 9, and the instant viscosity of the mixed solution was measured as 22 mPa.S by an online viscometer at the same time, that is, a polysilicic acid microgel was prepared.

[0021] The raw water is lake water with a turbidity of 10-15NTU and a pH of 7.2. Add raw water into milk of lime, adjust the pH value at 8.5, then add the liquid obtained by mixing sodium silicate and sulfuric acid through a high-speed stirrer, and add sewage at a ratio of 0.05wt%, keep the instant viscosity of the mixed...

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Abstract

The invention relates to a method for treating feedwater raw water in urban water area and tap water factory, and in particular relates to flocculant applicable to low-temperature low-turbidity feedwater raw water, which belongs to the technical field of feedwater raw water treatment process. The treatment method comprises the steps of adding lime milk into the feedwater raw water, adjusting the pH value to be 8 to 8.5, adding sodium silicate and sulfuric acid, mixing through a high-speed stirrer to obtain a liquid, wherein the addition ratio of raw water is 0.01 to 0.05wt%, maintaining the instant viscosity of the mixed liquid to be less than 50mPa.S, maintaining the pH value at 8 to 8.5 for 2 minutes, blowing air or carbon dioxide, lowering the pH value to 7.5 to 7.8, discharging the raw water into a settling pool or an air floatation pool to separate the water and mud, and filtering the mud through a piece of filter cloth or a vacuum suction filter. Through the enhanced coagulation, the removal range and the removal rate of organic matters can be further enlarged and improved by improving the coagulation condition. The pollutant treatment range is wide, the effect is good, the production raw material is widely sourced, the cost is low, the performance is stable, and no environment pollution is produced.

Description

technical field [0001] The invention relates to a method for treating raw water of urban water areas and waterworks, in particular to a flocculant used for raw water of low-temperature and low-turbidity water supply, and belongs to the technical field of raw water for water supply. Background technique [0002] The main removal objects of the conventional drinking water treatment process are suspended solids, colloidal impurities and bacteria in the source water. Its purification technology appears in the process of people's pollution control, and has been continuously developed, improved and perfected. With the rapid development of industry, water pollution is becoming more and more serious, and harmful substances in water are increasing year by year. At the same time, with the gradual improvement of water quality analysis technology, the types of trace pollutants that can be measured in source water and drinking water are also increasing. In order to meet people's living ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/52C01B33/141
Inventor 郑春明孙晓红陈佩佩朵志福鲍守民
Owner TIANJIN POLYTECHNIC UNIV
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