Method for repairing soil contaminated by polycyclic aromatic hydrocarbon by combining fenton-like chemical oxidation and biological heap technologies

A technology of polluted soil and chemical oxidation, applied in the field of contaminated soil remediation, can solve the problems of limiting microbial degradation activity, disturbing soil microbial population, and difficult to deal with polycyclic aromatic hydrocarbons, and achieve the effect of shortening the remediation cycle, improving oxidation efficiency, and short cycle time

Active Publication Date: 2016-08-10
HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
View PDF6 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction conditions require a pH of around 3, and this acidity condition seriously interferes with the soil microbial population.
[0005] The biopile degradation of soil organic pollutants is affected by many factors, such as the bioavailability of organic pollutants, biotoxicity, enzyme activity, etc., while PAHs are very difficult to deal with, and PAH pollution limits the Microbial Degradation Activity

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for repairing soil contaminated by polycyclic aromatic hydrocarbon by combining fenton-like chemical oxidation and biological heap technologies
  • Method for repairing soil contaminated by polycyclic aromatic hydrocarbon by combining fenton-like chemical oxidation and biological heap technologies
  • Method for repairing soil contaminated by polycyclic aromatic hydrocarbon by combining fenton-like chemical oxidation and biological heap technologies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1. Preparation of soil samples.

[0048] Clean soil samples: use the subsurface layer (5-10cm) of ordinary soil. Remove rhizomes, leaves, etc., and pass through a 5mm sieve after indoor air drying. After determination, the PAHs content in the soil was lower than the detection limit, the organic matter content was 1.6%, and the pH=7.5. The clean soil samples were sterilized by autoclave with moist heat.

[0049] PAHs-contaminated soil samples: Spray a certain volume of acetone solution of phenanthrene, pyrene, benzo[a]pyrene, indeno[1,2,3-cd]pyrene evenly on the clean soil sample, so that various PAHs in the soil reach Set the initial concentration, place it in a dark place in a fume hood to completely volatilize the acetone in the soil, wrap the container with aluminum foil, set the temperature to 4°C, and store it for later use. The initial concentration was 18.34mg / kg of phenanthrene, 17.24mg / kg of pyrene, 1.32mg / kg of benzo[a]pyrene, and 1.48mg / kg of indeno[1,2,3-...

Embodiment 2

[0064] Process according to class-Fenton+ biological pile of the present invention:

[0065] ① Add H with a mass fraction of 30% to the heap three times 2 o 2 solution, with an interval of 6 hours, H 2 o 2 Volume mass ratio of solution to contaminated soil: 0.15L: 1kg for the first time, 0.10L: 1kg for the second time, 0.05L: 1kg for the third time, and react for 12 hours;

[0066] ② Spray β-cyclodextrin solution with a concentration of 20g / L on the pile, and its volume-mass ratio to the polluted soil is 0.1L: 1kg;

[0067] ③ Add the bacterial agent and the bacterial content is 10 9 cfu / g of the white-rot fungus-Pleurotus pellagra suspension, the volume-to-mass ratio of the white-rot fungus-Pleurotus pellagra suspension to the polluted soil is 0.3L:1kg;

[0068] ④Spray urea to the pile to adjust the ratio of nutrients C:N:P to 100:10:1;

[0069] ⑤ The air compressor blows air to the biopile through the aeration pipe to aerate the biopile for 1 hour, no less than twice a ...

Embodiment 3

[0077] 1. The contaminated soil for testing was collected from a farmland near a steel factory in Hunan. After being air-dried, it passed through a 5mm sieve. The organic matter content of the soil was determined to be 62.75g·kg -1 , pH=6.85, the content of phenanthrene is 56.25mg·kg -1 , the content of pyrene is 68.82mg·kg -1 , the content of benzo[a]pyrene is 15.56mg·kg -1 , the content of indeno[1,2,3-cd]pyrene is 11.14mg·kg -1 .

[0078] 2. Weigh 5000g of air-dried soil, 200g of magnetite, 100g of straw, and 200g of mushroom dregs, and mix them evenly;

[0079] 3. After mixing, put it into the reaction device. There is a ventilation pipe at the bottom of the device. Turn on the small vibrator for 1 hour, and turn it on once every 12 hours;

[0080] Add 30% H to the heap three times 2 o 2 Solution, 1L for the first time, 0.5L for the second time, 0.25L for the third time, react for 6h;

[0081] 4. Spray 0.5L of β-cyclodextrin solution with a concentration of 15g / L, 0...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for repairing soil contaminated by polycyclic aromatic hydrocarbon by combining fenton-like chemical oxidation and biological heap technologies. A fenton-like method is used for pre-oxidation of contaminated soil heaps, and then aerobic microorganisms in the biological heaps are used for repairing treatment. The two methods have complementary advantages, can achieve synergistic interaction, and have the beneficial effects of being efficient, economical and short in period; and the soil obtained after repairing meets the GB 15618-2008 in revise of 'Soil Environmental Quality Standard'.

Description

technical field [0001] The invention belongs to the field of contaminated soil remediation, and in particular relates to a method for remediating polycyclic aromatic hydrocarbon contaminated soil by a Fenton-like pre-oxidation enhanced biological pile. Background technique [0002] Soil polycyclic aromatic hydrocarbons (PAHs) pollution has become a common problem. PAHs mainly come from coal gasification, wood preservation and the production process of petroleum products. Because of their carcinogenicity, teratogenicity and mutagenicity, PAHs are the main pollution. The remediation of the site has attracted more and more attention. In recent years, the biopile technology characterized by microbial enhanced remediation has been increasingly used in the remediation of PAH-contaminated soil. [0003] Biopile is a bioremediation method that concentrates polluted soil and combines various strengthening measures to create a suitable living environment for microorganisms in the pile...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08B09C1/10
CPCB09C1/00B09C1/08B09C1/105
Inventor 李智王子规罗文连周洁靳菁
Owner HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap