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In-situ restoring method of bottom mud polluted by surface water body

A water pollution and in-situ remediation technology, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve obstacles, reduce service life, unfavorable degradation and removal of sediment organic pollutants, etc. problem, to achieve the effect of inhibiting migration, reducing the proportion, and replacing it regularly

Inactive Publication Date: 2012-09-19
SHANGHAI OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the existing defects of sediment active covering technology include: the sediment covering layer will physically separate the polluted sediment from the overlying water body, which will hinder the overlying water body from replenishing the sediment with electron acceptors required for microbial degradation of organic matter - Dissolved oxygen, not only is not conducive to the degradation and removal of sediment organic pollutants, but also the sediment in anaerobic state is more likely to release phosphorus to pore water, which may reduce the use of overburden to inhibit sediment organic pollutants and phosphorus release life
However, at present, there are no research reports on the in-situ treatment of sediment nitrate and the combined technology of sediment cationic surfactant modified zeolite active covering technology for in-situ remediation of surface water contaminated sediment at home and abroad.

Method used

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  • In-situ restoring method of bottom mud polluted by surface water body
  • In-situ restoring method of bottom mud polluted by surface water body
  • In-situ restoring method of bottom mud polluted by surface water body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Take 62.5g of natural zeolite that has been washed with distilled water, dried and passed through an 80-mesh sieve in a 1L conical flask, and pipette 500mL of cetylpyridinium bromide (CPB) with a concentration of 50mmol / L After the stock solution was fully mixed with zeolite, it was placed in a constant temperature water area at 40°C and oscillated at 150rpm for 2 days. The concentration of CPB in the supernatant was analyzed by ultraviolet spectrophotometry (λ=259nm), and the equilibrium concentration was calculated according to the standard curve of CPB. The adsorption amount of CPB is 359 mmol / kg zeolite. Finally, the CPB modified zeolite was washed with distilled water until no bromide ions were detected in the cleaning supernatant, and then placed in an oven at 50° C. for blast drying. After cooling, the CPB modified zeolite was obtained. Repeat the above process 8 times to collect all CPB modified zeolites for later use.

[0037] (2) Collect surface sediment ...

Embodiment 2

[0041] (1) Take 62.5g of natural zeolite that has been washed with distilled water, dried and passed through an 80-mesh sieve in a 1L conical flask, and pipette 500mL of cetylpyridinium bromide (CPB) with a concentration of 50mmol / L After the stock solution was fully mixed with zeolite, it was placed in a constant temperature water area at 40°C and oscillated at 150rpm for 2 days. The concentration of CPB in the supernatant was analyzed by ultraviolet spectrophotometry (λ=259nm), and the equilibrium concentration was calculated according to the standard curve of CPB. The adsorption capacity of CPB is 334 mmol / kg zeolite. Finally, the CPB modified zeolite was washed with distilled water until no bromide ions were detected in the cleaning supernatant, and then placed in an oven at 50° C. for blast drying. After cooling, the CPB modified zeolite was obtained. Repeat the above process 8 times to collect all CPB modified zeolites for later use.

[0042] (2) Collect surface sedimen...

Embodiment 3

[0046](1) Take 62.5g of natural zeolite that has been washed with distilled water, dried and passed through an 80-mesh sieve in a 1L conical flask, and pipette 500mL of cetylpyridinium bromide (CPB) with a concentration of 50mmol / L After the stock solution was fully mixed with zeolite, it was placed in a constant temperature water area at 40°C and oscillated at 150rpm for 2 days. The concentration of CPB in the supernatant was analyzed by ultraviolet spectrophotometry (λ=259nm), and the equilibrium concentration was calculated according to the standard curve of CPB. The adsorption amount of CPB is 359 mmol / kg zeolite. Finally, the CPB modified zeolite was washed with distilled water until no bromide ions were detected in the cleaning supernatant, and then placed in an oven at 50° C. for blast drying. After cooling, the CPB modified zeolite was obtained. Repeat the above process 8 times to collect all CPB modified zeolites for later use.

[0047] (2) Collect surface sediment f...

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Abstract

The invention discloses an in-situ restoring method of bottom mud polluted by surface water body. The in-situ restoring method comprises the following steps of: injecting nitrate solution into the bottom mud, removing organic pollutant in the bottom mud by using the nitrate and inhibiting releasing of phosphorous in the bottom mud; adding active cover materials on the bottom mud-water interface to form an active cover layer system; controlling ammonia nitrogen released from the bottom mud by using the formed active cover layer system; and preventing the nitrate in pore water from migrating towards overlaying water so as to avoid the nitrite pollution of the overlaying water. Through the technical scheme, the in-situ restoring method can realize in-situ restoring of the bottom mud polluted by surface water body such as lakes or rivers as well as releasing control of the nitrogen phosphorous and organic pollutant in the bottom mud.

Description

technical field [0001] The invention belongs to the technical field of restoration of surface water polluted bottom mud, and relates to a method for in-situ repairing of rivers, lakes and other surface water polluted bottom mud using combined technology of bottom mud nitrate in-situ treatment and bottom mud active covering. The nitrate is injected into the bottom mud, and then the active covering material is added to the bottom mud-water interface to form an active covering layer system, and finally realize the in-situ repair of the bottom mud polluted by the surface water body. technical background [0002] Sediment is not only an important destination and reservoir for pollutants entering rivers, lakes and other surface water bodies, but also an endogenous source of water pollution on surface water bodies. Especially when exogenous pollution is effectively controlled or completely cut off, sediment will become an important source of pollutants in the overlying water of sur...

Claims

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Application Information

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IPC IPC(8): C02F11/00
Inventor 林建伟詹艳慧
Owner SHANGHAI OCEAN UNIV
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