Method for producing greening substrate through rapid composting of dredged sediment

A technology for dredging sediment and greening substrates, applied to chemical instruments and methods, sewage/sludge fertilizers, nitrogen fertilizers, etc., can solve the problems of high pH value of solidified soil, high hardness of solidified soil, unsuitable for plant growth, etc., to achieve corrosion The effect of low requirements, high liquid phase viscosity, and shortened production cycle

Pending Publication Date: 2021-06-18
湖南省交通科学研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In these patents, silicate and volcanic ash materials are used as solidifying agents to solidify the sludge. Although this method can obtain high-strength solidified soil, it will also cause the pH value of the solidified soil to be high at the same time. The hardness of the soil is too large and the structure is dense, which is not suitable for plant growth

Method used

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  • Method for producing greening substrate through rapid composting of dredged sediment
  • Method for producing greening substrate through rapid composting of dredged sediment

Examples

Experimental program
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Effect test

Embodiment 1

[0051] A method for dredging bottom mud to quickly compost to produce green substrates, comprising the following steps:

[0052] S1 is concentrated, and the dredged bottom mud is concentrated to a water content of 90%; S2 is added with acid and stirred, and 3 parts of acid are added to the concentrated mud in S1, and the stirring time is 10 minutes; the acid includes oxalic acid. S3 pretreatment, then add 2 parts of iron salt and 10 oxidants, fully stir, the stirring time is 10 minutes, then add garden waste, cow dung and fully stir, the stirring time is 30 minutes, adjust the pH value in the sludge to 6.5; at 1m 3 Add 25kg of the mixture of iron salt and oxidant to the concentrated mud in the above S1. The oxidizing agent includes liquid ozone with a mass concentration of 35%. The iron salt includes iron oxide. S4 adjusts the carbon-nitrogen ratio and mixes the stockpiles to 1m 3 Add 8 parts of metal passivator modified zeolite and modified sepiolite to the pile body, mix...

Embodiment 2

[0060] A method for dredging bottom mud to quickly compost to produce green substrates, comprising the following steps:

[0061] S1 concentration, the dredged sediment is concentrated to a water content of 97%;

[0062] Add acid and stir in S2, add 5 parts of acid to the concentrated mud in S1, and stir thoroughly for 130 minutes; the acid includes oxalic acid.

[0063] S3 pretreatment, then add 6 parts of iron salt and 12 oxidants, fully stir, the stirring time is 30 minutes, then add garden waste, cow dung and fully stir, the stirring time is 60 minutes, adjust the pH value in the sludge to 7.3; at 1m 3 Add 10kg of the mixture of iron salt and oxidant to the concentrated mud in the above S1. The oxidizing agent includes liquid ozone with a mass concentration of 35%. The iron salt includes iron oxide.

[0064] S4 adjusts the carbon-nitrogen ratio and mixes the stockpiles to 1.5m 3 Add 1 part of metal passivator modified zeolite and modified sepiolite to the pile, mix eve...

Embodiment 3

[0072] A method for dredging bottom mud to quickly compost to produce green substrates, comprising the following steps:

[0073] S1 concentration, the dredged sediment is concentrated to a water content of 96%;

[0074] Add acid and stir in S2, add 4 parts of acid to the concentrated mud in S1, and stir thoroughly for 20 minutes; the acid includes oxalic acid.

[0075] S3 pretreatment, then add 3 parts of iron salt and 11 oxidants, fully stir, the stirring time is 20 minutes, then add garden waste, cow dung and fully stir, the stirring time is 45 minutes, adjust the pH value in the sludge to 7; at 1m 3 Add 21kg of the mixture of iron salt and oxidant to the concentrated mud in the above S1. The oxidizing agent includes liquid ozone with a mass concentration of 32%. The iron salt includes iron oxide.

[0076] S4 adjusts the carbon-nitrogen ratio and mixes the stockpiles to 1.2m 3 Add 7 parts of metal passivator modified zeolite and modified sepiolite to the pile body, mix ...

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Abstract

The invention belongs to the technical field of dredged sediment, and particularly relates to a method for producing a greening substrate through rapid composting of dredged sediment, which comprises the following steps: S1, concentrating; S2, acid adding and stirring; S3, preprocessing; S4, adjusting of the carbon nitrogen ratio; and S5, composting. According to the technology and the system, the high-quality wood which is low in energy consumption, short in production period, uniform and consistent in carbonization degree of the interior and the surface of the wood, high in strength, stable in performance, low in production cost and suitable for mass production is provided.

Description

technical field [0001] The invention belongs to the technical field of dredging bottom mud, in particular to a method for quickly composting dredged bottom mud to produce greening substrates. Background technique [0002] Sediment is an important part of the water ecosystem. It stores a large amount of nutrients, heavy metals and organic matter. Under certain circumstances, it is released into the water body through the mud-water interface, which is the endogenous pollution that causes the black and odor of the water body. Environmental dredging is an effective way to solve endogenous pollution, but it will produce a large amount of dredged sediment. The traditional landfill disposal of dredged sediment is limited by the shortage of landfill capacity and high transshipment costs. Therefore, the harmless and resource utilization of dredged sediment has become a hot issue in the environmental protection industry, and the solution to the high water content of dredged sediment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00C05F7/00C05F17/20C05F17/60C02F11/00C02F11/02C02F11/06C02F11/12
CPCC05B13/02C05F7/00C05F17/20C05F17/60C02F11/12C02F11/02C02F11/06C02F11/004C05C9/00C05F3/00C05F11/00C05G3/00Y02W30/40Y02A40/20
Inventor 方涵潇戴利生肖怀宪蒋康黄国勤冯宇周振华
Owner 湖南省交通科学研究院有限公司
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