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Biological phosphorus-controlling and phosphorus-removing method used in eutrophic lake internal pollution

A technology of endogenous pollution and eutrophication, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of destroying the structure of biological populations and their habitats in lake ecosystems, and weakening lakes Problems such as self-purification function and chemical drug residues can prevent the occurrence of cyanobacteria blooms, the management and operation are simple and easy, and the cost or investment is low.

Inactive Publication Date: 2011-06-15
SHANGHAI OCEAN UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the above problems, overcome the high cost and high technical difficulty, and the chemicals used are likely to cause drug residues, resulting in secondary pollution, and will destroy the original biological population structure and habitat of the lake ecosystem, and weaken the self-purification of the lake. To solve the problem of function, provide a method for biological phosphorus control and removal of endogenous pollution in eutrophic lakes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The test period is from January 1, 2000 to December 31, 2009.

[0035] Silver carp and bighead carp are stocked in part or in the whole of Qiandao Lake, and the annual stocking volume is more than 500 tons. According to the monitoring data in the past ten years, although the external pollution load is due to the rapid urban development of Qiandao Lake and the social and economic changes in the upper reaches of Xin’an River, the mainstream of Qiandao Lake Despite rapid development and population increase in the basin, the total phosphorus in Qiandao Lake continued to decline in spite of fluctuations, from an average of 0.025mg / L before the test period to 0.01mg / L. A typical case of using silver carp and bighead carp to control and remove phosphorus.

Embodiment 2

[0037] The test period is from December 20, 2009 to July 20, 2010.

[0038]It was carried out in the open water area (between Junmin Bridge and Zhihekou Port) south of the Gehu Aquatic Germplasm Resources Protection Area. A large silver carp and bighead carp breeding area of ​​about 140 hectares is surrounded by floating nets. The enclosure area is divided into 3 different areas, which are stocked and managed by 3 farmers respectively. The density of silver carp and bighead carp species released by each household is different, and the stocking volume is 75 tons, 65.7 tons, and 50.4 tons respectively. At the same time, the water chemical indicators of the water body are regularly measured, such as COD (chemical oxygen demand), TN (total nitrogen), TP (total phosphorus), Chla (chlorophyll), transparency, dissolved oxygen and other chemical indicators. The test results show that the total phosphorus in the water body has dropped from 0.08mg / L at the beginning of the test to abo...

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Abstract

A biological phosphorus-controlling and phosphorus-removing method used in the eutrophic lake internal pollution comprises the following steps: (1) filter-feeding fishes are put in a lake or reservoir to be treated to breed, the aim of controlling the internal phosphorus of a water body can be realized by utilizing different utilization efficiencies of the filter-feeding fishes to nitrogen and phosphorus in the water body; (2) when the filter-feeding fishes are bred, the number of ferocious fishes is controlled to ensure the survival rate of the bred filter-feeding fishes and increase the breeding efficiency and effect, wherein the filter-feeding fishes are silver carp and bighead carp, the ferocious fishes are Elopichthys bambusa, Culter alburnus and Culter mongolicus and the survival rate of the bred filter-feeding fishes is no less than 70%; and (3) fishes which eats organic detritus is bred at the bottom when the bottom has no fish to eat organic detritus to ensure that the biomass is no less than 1-10g / m<3>, wherein the bred or propagated fishes eating organic detritus are Xenocypris microlepis or crucian carp.

Description

technical field [0001] The invention relates to a method for biological phosphorus control and phosphorus removal related to endogenous pollution of eutrophic lakes, belonging to the technical field of aquatic products and environmental science. Background technique [0002] The eutrophication of lakes and reservoirs is still the most important water environment problem facing our country and even the whole world. Due to the impact of global environmental changes and various human activities, the eutrophication of lakes in my country is still intensifying. The emergence of lake eutrophication not only seriously weakens the ecological function of the water body and destroys the health and stability of the aquatic ecosystem, but also causes frequent outbreaks of toxic algae blooms, which directly affects people's effective use of water resources. utilization and the sustainable development of social economy. Therefore, the eutrophication of lakes has become one of the most u...

Claims

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Application Information

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IPC IPC(8): C02F3/32
Inventor 刘其根李培培贾佩峤崔志辉赵良杰
Owner SHANGHAI OCEAN UNIV
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