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Treating method of polluted or nutritive water

A technology for water bodies and submerged plants, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., to achieve low cost, quick results, and remarkable ecological benefits

Inactive Publication Date: 2004-10-27
SOUTH CHINA PLANT INST CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The negative impact of chemical substances in the remediation process can also be resolved in the subsequent biological remediation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Taking the small pond in front of the Bird Garden in the botanical garden as the object, the pond area is about 80m 2 , the water depth is 1-3m, and the bottom of the lake is black silt. The main source of pollution comes from a nearby toilet. The pond was a grass-type pond in the 1960s and 1980s. Due to the increasing pollution, it became an algae-type pond in the 1990s. The measurement of the water quality of the pond shows that the transparency is 0.4m, the pH value is 5.28, the dissolved oxygen (DO) is 3.3mg / L, the biological oxygen demand (BOD) is 10.0mg / L, and the conductivity is 189.9μs / cm , the total P content is 0.25mg / L, the total N content is 2.0mg / L, the chlorophyll content is 0.33mg / L, and the plankton is 25 million / L. The above indicators show that the small pond is a serious eutrophic water body.

[0019] After being treated by the method of the present invention, 50 kilograms of unslaked lime is evenly sprinkled in the whole pond to make the pH value r...

Embodiment 2

[0022] Taking a fish pond near Meilin Reservoir in Shenzhen as the treatment object, the pond has an area of ​​about 300m 2 , the water depth is 1-2m, and the bottom of the lake is yellow-black silt. The main source of pollution comes from fish feed and other sediments within three years. The fishing was abandoned due to increasing trophication, and finally turned into a typical algal pond. The measurement of the water quality of the pond shows that the transparency is 0.7m, the pH value is 5.6, the dissolved oxygen (DO) is 3.7mg / L, the biological oxygen demand (BOD) is 9.7mg / L, and the conductivity is 194.8μs / cm , the total P content is 0.28mg / L, the total N content is 1.7mg / L, the chlorophyll content is 0.38mg / L, and the plankton is 28.5 million / L. The above indicators show that the fish pond is a serious eutrophic water body.

[0023] During the treatment process, 100 kg of quicklime was evenly sprinkled on the entire pond, and the transparency of the water body increased...

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Abstract

The treatment includes the following technological steps: adding alkali matter to water to result in pH 8.5-10; adding acid matter to clarified water to neutralize the pH to 7; adding active matter to water to regulate the living environment for aquatic creature in water; and finally planting water depositing plant to adsorb and absorb N and P deposited to water bottom. The present invention synthesizes chemical and biological methods of treating nutritive water and the treating process is favorable to ecological environment.

Description

technical field [0001] The invention relates to a treatment method for polluted water bodies. Background technique [0002] Nutrients in lakes, reservoirs and other waters, such as N and P, are constantly replenished and accumulated excessively, resulting in excess nutrients in the water body, resulting in a series of negative effects, such as a large number of blue-green algae reproduction, fish death, and urban lake landscape damage. called water eutrophication. This phenomenon occurs in the bay, port, etc. is called red tide. The U.S. National Environmental Protection Agency has started a long-term water quality monitoring project since the 1990s, and found that all major water systems and lakes in the country have eutrophication problems to varying degrees. By 2000, the surface water pollution of the seven key river basins in my country, the Yangtze River, the Yellow River, the Pearl River, the Songhua River, the Huaihe River, the Haihe River, and the Liaohe River, was...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 任海彭少麟郭少聪申卫军季申芒李志安
Owner SOUTH CHINA PLANT INST CHINESE ACAD OF SCI