Green pollution-free pre-oxidation coagulation-enhancing high-efficiency algae-removal method

A pre-oxidation, non-polluting technology, applied in chemical instruments and methods, water pollutants, oxidized water/sewage treatment, etc., can solve the problems of large coagulant dosage, long oxidation time, etc., and achieve good algae removal effect , simple method, low cost effect

Inactive Publication Date: 2017-07-04
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention aims at this problem, and taking into account the problems of long oxidation time and large dosage of coagulant in the traditional pre-oxidation-coagulation method, and proposes a method to solve the problem of high-algae water treatment or

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]According to the detection by the monitoring station, eutrophication pollution occurred in the reservoir of a water supply plant, the concentration of algae cells reached 10 million / ml, and the turbidity of raw water was 10NTU. The water plant originally used aluminum chloride as a flocculant, and the dosage was 15mg / L. After the water bloom occurred, the flocculant dosage was increased to 25mg / L, but the effect was still unsatisfactory. The removal rate of algae cells was only 72%. The original process flow of the water plant is: raw water, mixing in the mixing tank, flocculation in the flocculation tank, sedimentation in the sedimentation tank, filtration in the filter, passing through the clear water tank, and entering the pipe network system.

[0025] Adopt the method of the present invention to strengthen algae removal to the above-mentioned water source polluted by eutrophication:

[0026] (1) Install a number of 50W ultraviolet lamps in the original mixing tank of...

Embodiment 2

[0030] Water blooms occurred in the pond landscape of a city park in summer, the water body turned green, fish and shrimp and other aquatic organisms died, and there was a peculiar smell, which affected the lives of nearby residents. After testing, the concentration of algae cells in the water reached 2 million / ml, and the turbidity reached 15NTU.

[0031] Adopt the method of the present invention to carry out rapid algae removal to the landscape water polluted by the above-mentioned algal blooms:

[0032] (1) Install a number of 60W UV lamp tubes on the bottom of the boat. The hull carries the UV generator and plays a stirring role at the same time. Add hydrogen peroxide to the pond water, and the two work together for 5-10 minutes. The ratio of hydrogen peroxide dosage to algae cells is 6.15 mg:10 9 algal cells.

[0033] (2) On the basis of step (1), add ferrous sulfate and organic flocculant chitosan for coagulation. Among them, the molar ratio of hydrogen peroxide and f...

Embodiment 3

[0037] A sewage treatment plant in a southern county is equipped with an ultraviolet disinfection pool. However, because the sewage in the sedimentation tank has a long hydraulic retention time and a good aquatic environment, algae blooms in large numbers in summer, floating on the water surface and unable to settle, and there is a problem of mud ball blockage in the filter tank, resulting in algae in the effluent It did not meet the standard, and the monitoring found that the concentration of algae cells reached 500,000 / mL, and the turbidity was 10NTU.

[0038] Adopt method of the present invention to carry out regulation to above-mentioned sewage treatment plant:

[0039] (1) The county sewage treatment plant has a wide site, and the effluent is discharged after being sterilized by ultraviolet rays in the disinfection pool. Utilize the ultraviolet lamp tube in the ultraviolet disinfection tank, and directly add hydrogen peroxide in the disinfection tank as a pre-oxidation t...

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PUM

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Abstract

The invention is applicable to the fields of algae-containing drinking water, sewage and landscape water treatment, and in particular, relates to a green pollution-free pre-oxidation coagulation-enhancing high-efficiency algae-removal method. Aiming at current situations of eutrophic water source algae pollution, landscape water algal bloom outburst and sewage treatment plant algae standard exceeding, provided is the high-efficiency algae-removal method comprising the steps of jointly acting on algae-containing water with an ultraviolet technology and hydrogen peroxide, pre-oxidizing and then adding ferrous salt, aluminum salt and the like for enhancing coagulation. Ultraviolet light and hydrogen peroxide reduce the activity of algal cells and increase the specific gravity of the algal cells to make the algal cells easy to settle, and excessive hydrogen peroxide in the pre-oxidation stage is used for oxidation of the later-added ferrous salt; trivalent iron in a newly generated state is continuously produced in the coagulation stage, so that the strong flocculation effect is exerted. Iron water complexes, aluminum salt, divalent iron and trivalent iron salt hydrolysate and the like existing in the system accelerate the formation and growth of flocs and strengthen the coagulation process. The method is mainly applied to drinking water source water and water treatment plant and urban landscape water with algae pollution problems.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for pre-oxidation enhanced coagulation and algae removal. Background technique [0002] The algae bloom phenomenon caused by water eutrophication increases the cost of water treatment and maintenance, brings many obstacles to the advanced treatment of water and the daily maintenance of landscape water, and makes the water ecological environment unbalanced, seriously threatening the health of residents and other organisms. Water safety has become one of the important challenges in the field of water resources and environment. According to reports, in my country, algae blooms have appeared in natural lakes including Dianchi Lake, Taihu Lake, Chaohu Lake, urban water supply reservoirs, Wuhan East Lake, Nanjing Xuanwu Lake and other landscape lakes. The water use of many urban agglomerations has brought great pressure, and it has also brought troubles to ...

Claims

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Application Information

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IPC IPC(8): C02F1/32C02F1/52C02F1/54C02F1/72C02F101/30
CPCC02F1/32C02F1/5236C02F1/5263C02F1/54C02F1/722C02F2101/30C02F2303/20C02F2305/023
Inventor 代瑞华贾沛莉周燕平陈诗雯
Owner FUDAN UNIV
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