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In situ repair agent for sediments contaminated by polycyclic aromatic hydrocarbon compounds and repair method thereof

An in-situ remediation agent and polycyclic aromatic hydrocarbon technology, which is applied in the fields of water pollutants, chemical instruments and methods, and biological sludge treatment, can solve the problems of affecting PAHs biodegradation efficiency, low dissolved oxygen concentration, and microbial electron acceptor concentration feedback. In order to achieve the effects of low cost of treatment, broad application prospects, improvement of abundance and degradation activity

Active Publication Date: 2014-01-08
GUANGDONG INST OF MICROBIOLOGY GUANGDONG DETECTION CENT OF MICROBIOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the concentration of dissolved oxygen in the sediment environment is often low, and the concentration of electron acceptors for maintaining the normal respiration of microorganisms is quite insufficient, which is also an important factor affecting the biodegradation efficiency of PAHs in sediments.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: In-situ restoration of a black and smelly river sediment in Foshan City, Guangdong Province

[0013] Sixteen kinds of PAHs prioritized by the U.S. Environmental Protection Agency (EPA), namely naphthalene (Nap), acenaphthylene (Acy), acenaphthylene ( Ace), fluorene (Flu), phenanthrene (Phe), anthracene (Ant), fluoranthene (Fla), pyrene (Pyr), benzo[a]anthracene (Baa), lettuce (Chr), benzo[b]fluorine Anthracene (Bbf), benzo[ik]fluoranthene (Bkf), benzo[a]pyrene (Bap), indeno(1,2,3-cd)pyrene [In(1,2,3-cd)p ], dibenzo(a,h)anthracene [D(a,h)a], benzo(g,h,i)perylene (perylene) [B(g,h,i)p]. The total content of PAHs in the sediments of these two monitoring points was more than 2000μg / kg, of which 2# was 2589.366μg / kg, and 3# was 3187.358μg / kg, which was quite serious.

[0014] Ca(NO 3 ) 2 4H 2 O, C 6 h 5 o 7 Fe·5H 2 O, polyacrylamide and water are uniformly mixed according to the mass ratio of 100:200:1:2000 to obtain an in-situ restoration agent for polyc...

Embodiment 2

[0018] Example 2: In-situ restoration of a black and odorous river sediment in Shanghai

[0019] Sixteen PAHs prioritized by the U.S. Environmental Protection Agency (EPA) were detected in a black and odorous river sediment in Shanghai, with an average total PAHs content of 1800.345 μg / kg. Mainly ik]fluoranthene, benzo[a]pyrene, indeno(1,2,3-cd)pyrene, dibenzo(a,h)anthracene, benzo(g,h,i)perylene]arene.

[0020] Ca(NO 3 ) 2 4H 2 O, C 6 h 5 o 7 Fe·5H 2 O, polyacrylamide and water are uniformly mixed according to the mass ratio of 1000:2000:10:100 to obtain an in-situ remediation agent for polycyclic aromatic hydrocarbon compound polluted deposits.

[0021] In every cubic meter of sediment, 5L of in-situ remediation agent for polycyclic aromatic hydrocarbons polluted sediment is injected each time, divided into five parts and injected at 40cm below the surface of the mud layer, and injected once a month. The removal rate of PAHs in the material reached 88.3%.

[0022] W...

Embodiment 3

[0024] Example 3: In-situ restoration of a black and odorous river sediment in Guangzhou

[0025] Sixteen PAHs prioritized by the U.S. Environmental Protection Agency (EPA) were detected in a black and odorous river sediment in Guangzhou, with an average total PAHs content of 2830.215 μg / kg. ) mainly aromatics.

[0026] Ca(NO 3 ) 2 4H 2 O, C 6 h 5 o 7 Fe·5H 2 O, polyacrylamide and water are uniformly mixed according to the mass ratio of 100:180:1:190 to obtain an in-situ remediation agent for polycyclic aromatic hydrocarbon compound polluted deposits.

[0027] In every cubic meter of sediment, 2.5L of in-situ remediation agent for polycyclic aromatic hydrocarbons polluted sediment is injected each time, divided into five parts and injected at 40cm below the surface of the mud layer, injected once a month, after two months of treatment, The removal rate of PAHs in sediment reached 95.3%.

[0028]When the total content of PAHs is lower than 200 μg / kg, inject 0.5 L of in...

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Abstract

The invention discloses an in situ repair agent of contaminated sediments for sediments contaminated by polycyclic aromatic hydrocarbon compounds and a repair method thereof. The in situ repair agent comprises Ca (NO3)2.4H2O, C6H5O7Fe.5H2O, polyacrylamide and water with a mass ratio of (100-1000) to (200-2000) to (1-10) to (100-2000). The in situ repair agent for sediments contaminated by polycyclic aromatic hydrocarbon compounds capable of being slowly released is intermittently thrown into PAHs contaminated sediments to improve the abundance and degrading activity of indigenous microorganisms in the sediments, promote the in situ degradation of PAHs and treat the contaminated sediments. The technology is simple to operate, low in necessary treatment cost, excellent in effect and free of secondary pollution, and no additional treatment site is constructed, so that the technology has a wide application prospect in the treatment of PAHs contaminated sediments.

Description

Technical field: [0001] The invention belongs to the technical fields of environmental pollution control engineering, ecological engineering and environmental bioengineering, and specifically relates to an in-situ repairing agent and a repairing method for sediments polluted by polycyclic aromatic hydrocarbons. Background technique: [0002] With the development of economy and society and the acceleration of social industrialization, more and more polycyclic aromatic hydrocarbons (PAHs) are released into the environment. Due to their high toxicity, persistence, bioaccumulation, and lipophilicity and hydrophobicity, they are easily adsorbed on particulate matter and accumulate in large quantities in water sediments, thereby endangering human health and ecological security through bioaccumulation. At present, the remediation technologies for PAHs-contaminated sediments at home and abroad mainly include physical, chemical and biological remediation technologies. Compared with ...

Claims

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Application Information

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IPC IPC(8): C02F11/02C02F101/32
Inventor 许玫英孙国萍郭俊
Owner GUANGDONG INST OF MICROBIOLOGY GUANGDONG DETECTION CENT OF MICROBIOLOGY
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