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Method for adsorbing seawater exceeding cadmium by cultivating blood clam

A seawater and mud cockles technology, applied in chemical instruments and methods, water/sludge/sewage treatment, applications, etc., can solve problems such as seawater pollution and achieve good economic results

Inactive Publication Date: 2009-08-05
ZHEJIANG OCEAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of seawater being polluted by cadmium, the present invention firstly screens a kind of marine organism, requiring it to have a higher bioaccumulation factor for cadmium. The organisms are all artificially bred species on tidal flats in my country at present. The cadmium tolerance test was carried out on the above three organisms respectively. Bioconcentration factors (BFC) are 109, 56, 55 respectively, so the present invention selects cockles to absorb seawater polluted by excessive cadmium

Method used

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  • Method for adsorbing seawater exceeding cadmium by cultivating blood clam
  • Method for adsorbing seawater exceeding cadmium by cultivating blood clam
  • Method for adsorbing seawater exceeding cadmium by cultivating blood clam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 1. Conditions: In the laboratory, the test seawater contains cadmium of 5.1μg / L and 10μg / L, the water is changed every 12 hours, (replace the seawater with the same cadmium concentration) oxygenated for 24 hours, and the room temperature is controlled at 22°C-26°C When changing the water every day, fish out the mud cockles with abnormal behavior or death. When changing the water in the morning, put the mud cockles into the solution containing Chlorella (the cadmium concentration of this solution is also the cadmium concentration of the test seawater) and feed for 0.5 hours. The test container is filled with 100L seawater, and 80 cockles are put into it.

[0012] 2. Method: Randomly take 5 cockles each time on 0 day, 1 day, 3 days, 5 days, 10 days, 15 days, 20 days, and 30 days, and detect the cadmium residue in the body: the experimental results are shown in Table 1:

[0013] Table 1 Data of cadmium residues in cockles over time (mg / kg)

[0014]

[0015] 3. Conclusi...

Embodiment 2

[0018] 1. Experimental conditions: In the laboratory, the concentration of cadmium in seawater is 25 μg / L and 50 μg / L, and the other conditions are the same, and the method is also the same.

[0019] Table 2 Change data of cadmium residues in mud cockles with time ((mg / kg)

[0020]

[0021]

[0022] 3. Conclusion:

[0023] At the same exposure concentration, the cadmium residues in mud clams generally increased with the increase of water exposure time, and the cadmium residue limit in mud clams after 30 days of the test did not meet my country's food hygiene and safety standards (3.0mg / kg). However, the sea water quality meets the national second-class water quality standard for aquaculture water.

[0024] Cockles with cadmium content exceeding the standard can be temporarily raised in natural seawater to release cadmium to meet the edible standard. The release test is as follows:

[0025] Each 20 mud cockles that have been raised in 25 μg / L and 50 μg / L seawater for 30...

Embodiment 3

[0028] Embodiment 3 comparative test:

[0029] In a farm in Yueqing, Wenzhou, a seawater sedimentation tank and a clam culture pond were changed at the same time. When the water was just changed, the concentration of cadmium in the seawater was 8.7 μg / L. After 5 days, the cadmium concentration in the seawater in the seawater sedimentation tank was 8.1 μg / L, and the cadmium concentration in the seawater in the mud cockle breeding pond was 1.3 μg / L. Adsorption of cadmium in seawater.

[0030] The instruments used in the above experiments are Varian AA240DUO atomic absorption spectrometer (with flame system and graphite furnace system) in the United States, and Milestone Ethos T microwave digestion instrument (with acid removal device) in Germany.

[0031] The detection of cadmium content in clam muscle refers to GB17378.6-2007 "Marine Monitoring Specification Part 6 Organism Analysis" "8.1 Flameless Atomic Absorption Spectrophotometry"; the detection of cadmium content in shell...

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Abstract

The invention relates to a method for adsorbing cadmium exceeding standard in seawater through cultivation of Ttgillarca granosa and belongs to the field of marine environmental protection; when the content of cadmium in the seawater exceeds the standard and is within the range of between 5.1 and 50 mu g / L, the water quality of the seawater is in the third class, fourth class and inferior fourth class and is unsuitable for cultivation and production; the experiment proves that when Ttgillarca granosa is cultivated in the seawater polluted by cadmium, the age of the Ttgillarca granosa is between 3 and 4 years; the weight is between 4.6 and 7.7 g; the Ttgillarca granosa is grown into formed Ttgillarca granosa with shell width of between 2.13 and 2.78 cm and shell length of between 1.61 and 2.04 cm; the cultivation density is not less than 160 pieces in each square meter (calculated according to average water depth of 0.2 meter); cadmium exceeding the standard in the seawater can be effectively adsorbed; the seawater is restored to the standard of second-class water quality, that is cadmium in the seawater is less than or equal to 5mu g / L; and the Ttgillarca granosa also has function of releasing cadmium and can come into the market as a commodity. The biological method for adsorbing cadmium has effects of convenience and low consumption and has economic, social and ecological benefits.

Description

technical field [0001] The invention relates to a method for using marine organisms to repair seawater polluted by cadmium, specifically a method for using cultured mud clams (Ttgillarca granosa) to absorb cadmium in seawater exceeding the standard, so that the seawater can reach the national standard for seawater cultivation of second-class seawater, It belongs to the field of marine environmental protection. Background technique [0002] With the development of our country's economy, the scale of investment in heavy industries such as iron and steel, electric power, cement, and electrolytic aluminum has increased, and the output of products has also continued to increase. The resulting industrial water has also continued to increase, and the industrial wastewater produced is continuously discharged through sewage pipes. Into rivers, and finally into the ocean, heavy metals are increasingly polluting the marine environment. In particular, it has brought serious harm to the...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F1/62A01K61/00C02F101/20
CPCY02A40/81
Inventor 郭远明钟志刘琴李铁军顾婕苗振清水柏年
Owner ZHEJIANG OCEAN UNIV
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