Method for promoting restoration of phenanthrene-polluted estuary and tidal flat sediments by utilizing disturbance of thick crabs

A sediment and tidal flat technology, which is applied to water pollutants, polluted waterways/lakes/ponds/rivers, animal feed, etc., can solve the difficulty of microbial restoration, the difficulty of restoration and treatment, and the vulnerability to water flow and tides issues such as impact

Inactive Publication Date: 2020-08-11
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

And most of the pollutants are distributed in the sediment layer, making it more difficult to repair and treat
These areas have com...

Method used

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  • Method for promoting restoration of phenanthrene-polluted estuary and tidal flat sediments by utilizing disturbance of thick crabs

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The concentration of phenanthrene pollution is 600mg / kg sediment (sediment moisture content 55%).

[0027] Insert disturbed biological thick crabs, inoculate thick crabs with an individual width of 2.5cm, and an inoculation density of 400cm 2 one. Due to the excavation of thick crabs, part of the sediment is exposed to the water surface. 12-24 hours after inoculation, record the page of the submerged area, and replenish clean water every day in the area far away from the activity of thick crabs to maintain the liquid level in the submerged area.

[0028] On the 14th day, 35 days, and 56 days, the degradation rate of phenanthrene on the sediment surface (0-15cm) was 38%, 70% and 90% through the disturbance of thick crabs, which was 16 and 30% higher than the natural degradation control group without thick crabs. , 35 percentage points.

Embodiment 2

[0030] The phenanthrene pollution concentration is 1000mg / kg sediment (sediment moisture content 56%).

[0031] Insert disturbed biological thick crabs, inoculate thick crabs with an individual width of 2.5cm, and an inoculation density of 300cm 2 one. Due to the excavation of thick crabs, part of the sediment is exposed to the water surface. 12-24 hours after inoculation, record the page of the submerged area, and replenish clean water every day in the area far away from the activity of thick crabs to maintain the liquid level in the submerged area.

[0032] Dried leaf powder was added regularly to improve the disturbing effect of thick crab feeding and excretion on sediments. Each thick crab is fed 1.5 g of bait containing 0.50 g of leaf powder + pine needle soil every week, and is put on the part of the sediment layer exposed to the water surface. The leaves are fresh broad-leaved wood leaves, dried at 90°C after collection, then raised to 120°C for 2 hours (sterilized), ...

Embodiment 3

[0038] The restored Philippine-polluted sediments are tidal flat muddy sediments and contain heavy oil pollution. Heavy oil pollution concentration is 2500mg / dm 3 Sediments, in which the pollution concentration of phenanthrene is 500mg / kg wet mud (moisture content 52%)

[0039] Insert disturbed biological thick crabs, inoculate thick crabs with an individual width of 3.0cm, and an inoculation density of 250cm 2 one. Due to the excavation of thick crabs, part of the sediment is exposed to the water surface. 12-24 hours after inoculation, record the page of the submerged area, and replenish clean water every day in the area far away from the activity of thick crabs to maintain the liquid level in the submerged area.

[0040]Each thick crab is put in 1.0g of leaf powder + 2g of humus soil bait every week, put in the part of the sediment layer exposed to the water surface, and put in twice. The leaves are fresh broad-leaved wood or coniferous wood leaves, dried at 75°C after co...

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Abstract

The invention provides a method for promoting restoration of phenanthrene-polluted estuary and tidal flat sediment by utilizing disturbance of thick crabs, the thick crabs are put into a phenanthrene-polluted sediment layer, and the inoculation density of one thick crab is 200-500 cm<2>. Under the condition that the phenanthrene concentration is 450-1000 mg/kg, the phenanthrene degradation rates of upper sediments (15 cm or above) are 36+/-3%, 68+/-4% and 75+/-2% respectively in 14 days, 35 days and 56 days. The degradation rates of lower sediments (below 15cm) are 11+/-3%, 15+/-4% and 27+/-2%respectively; and the improvement efficiency of the disturbance of the thick crabs on phenanthrene degradation is obvious. In addition, compound baits containing 0.25-1.0 g of dry leaf powder and humus are put into each living crab every week, so that the degrading and repairing effects can be greatly improved.

Description

technical field [0001] The invention belongs to the field of ecological environment, and relates to the treatment and restoration technology of Philippine polluted estuaries and tidal flat sediments, in particular to a method for promoting restoration and treatment of Philippine polluted sediments by using the disturbing effect of thick crabs. Background technique [0002] With the development of industrialization, the environmental problems caused by polycyclic aromatic hydrocarbons have attracted more and more attention. Polycyclic aromatic hydrocarbons refer to a class of compounds in which two or more aromatic rings are fused together, and are commonly found in the environment. Polycyclic aromatic hydrocarbons have become a relatively common type of organic pollutants in Chinese soil, and the pollution level is still increasing, directly affecting soil performance and agricultural product safety. Polycyclic aromatic hydrocarbons are highly carcinogenic, mutagenic, and t...

Claims

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Application Information

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IPC IPC(8): C02F11/02A01K61/59A23K50/80A23K10/20A23K10/30A23K20/20C02F101/32
CPCC02F11/02A01K61/59A23K50/80A23K10/20A23K10/30A23K20/20C02F2101/327C02F2103/007Y02A40/81
Inventor 田胜艳刘廷志
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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