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Contaminated bottom sediment remediation agent and preparation method and using method thereof

A technology for polluted sediments and remediation agents, applied in biological sludge treatment and other directions, can solve the problems of difficulty in large-scale implementation, high cost, high energy consumption, etc., and achieves no secondary pollution risk, convenient operation, and low treatment costs. Effect

Inactive Publication Date: 2011-08-24
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is difficult to be implemented on a large scale due to the need to lay out ventilation ducts and strengthen oxygenation for a long time, which consumes a lot of energy and costs high

Method used

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  • Contaminated bottom sediment remediation agent and preparation method and using method thereof
  • Contaminated bottom sediment remediation agent and preparation method and using method thereof
  • Contaminated bottom sediment remediation agent and preparation method and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Simple dehydration of the polluted sediment from the A section of the river is carried out, and its basic properties are shown in Table 1:

[0021] Table 1 Basic properties of polluted sediment in the river section A

[0022]

[0023] 1. Preparation of contaminated sediment remediation agent

[0024] Mineralized waste that has been landfilled for 10 years is taken, and the sundries are removed through a preliminary sieve, and then passed through a 1mm sieve to obtain mineralized waste with a particle size of less than 1mm and a moisture content of 17.7%. After the mushrooms are cultivated, the solid waste mushroom slag left after picking the mushrooms is chopped and passed through a 10mm sieve to obtain the mushroom slag with a particle size of less than 10mm. Mix the mineralized waste sieve and mushroom slag evenly at a mass ratio of 2:1, add inorganic salt nutrient solution NMS with a mass of 25% of the mixture, adjust the water content to 47%, and cultivate for 3...

Embodiment 2

[0031] After simple dehydration of the polluted sediment from the B section, its basic properties are shown in Table 2:

[0032] Table 2B Basic properties of polluted sediment in the river section

[0033]

[0034] 1. Preparation of contaminated sediment remediation agent

[0035] Mineralized waste with a landfill time of 13 years was taken, and the sundries were removed through a preliminary sieve, and then passed through a 5mm sieve to obtain mineralized waste with a particle size of less than 5mm and a moisture content of 16.3%. After the mushrooms are cultivated, the solid waste mushroom slag left after picking the mushrooms is chopped and passed through a 10mm sieve to obtain the mushroom slag with a particle size of less than 10mm. Mineralized garbage undersize and mushroom slag were mixed evenly in a mass ratio of 4:1, and an inorganic salt nutrient solution NMS with a mass of 25% of the mixture was added to adjust the water content to 45%, and cultivated for 5 days...

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Abstract

The invention discloses a contaminated bottom sediment remediation agent, a preparation method and a using method thereof, and relates to a remediation agent for strengthening the degradation of polycyclic aromatic hydrocarbons in contaminated bottom sediment and a treatment method. The preparation method comprises the following steps of: sieving mineralized refuse by using a sieve with the aperture of between 1 and 5mm to obtain a mineralized refuse siftage, shredding mushroom residue, sieving the mushroom residue by using a sieve with the aperture of 10mm, weighing the mineralized refuse siftage and the mushroom residue in a mass ratio of (2:1)-(5:1), mixing uniformly, adding inorganic salt nutrient solution, namely NMS in an amount which is 25 percent based on the mass of the mixture, regulating the water content to be between 45 and 55 percent, and culturing for 3 to 7 days to obtain the contaminated bottom sediment remediation agent. The using method comprises the steps of: weighing the contaminated bottom sediment remediation agent and the contaminated sediment, in which the concentration of the polycyclic aromatic hydrocarbons is 10 to 100mg / kg after the dehydration, according to a mass ratio of (1:5)-(1:10), mixing uniformly, naturally composting, and maintaining the water content of a heap to be between 30 and 32 percent, wherein the removal rate of the polycyclic aromatic hydrocarbons can reach 55 to 90 percent through detection. The source of raw materials of the remediation agent is wide, the cost is low, preparation cost is low, the remediation effect of the contaminated bottom sediment is high, the fertility of the bottom sediment is high, and the method is easy to operate and is suitable for treating bottom sediment contaminated by the polycyclic aromatic hydrocarbons on a large scale.

Description

technical field [0001] A polluted bottom mud remediation agent and its preparation and use method relate to a remediation agent for strengthening the degradation of polycyclic aromatic hydrocarbons in polluted bottom mud and its preparation and use method. The invention belongs to the field of sediment pollution remediation. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) refer to a general term for a class of organic compounds with two or more fused aromatic rings, mainly derived from chemical industry, thermal power industry, petroleum industry, transportation, garbage and straw incineration, sewage irrigation and Agricultural sludge, etc., are persistent organic pollutants. PAHs are highly biotoxic, bioaccumulative, and semi-volatile. Currently, there are more than 400 known carcinogenic PAHs and their derivatives. PAHs can be transferred to the water environment through various channels, and then transferred from the liquid phase to the solid phas...

Claims

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Application Information

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IPC IPC(8): C02F11/04
Inventor 赵由才苏良湖黄仁华邓穗李慧
Owner TONGJI UNIV
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