Engineering method for producing biochar soil from dredging sediment

A bio-carbon and engineering technology, applied in the preparation of organic fertilizer, biological organic part treatment, fertilizer mixture and other directions, can solve the problem of sediment disposal and other problems, achieve high added value, speed up the process of making bio-carbon soil, social Highly recognized effect

Inactive Publication Date: 2016-06-08
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

[0009] The purpose of the present invention is to provide an engineering method for preparing bio-carbon soil from dredging bottom mud to solve the problem of bottom mud disposal caused by large-scale ecological dredging

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  • Engineering method for producing biochar soil from dredging sediment
  • Engineering method for producing biochar soil from dredging sediment

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Embodiment Construction

[0029] In this project, samples were taken in a watershed in the upper reaches of Taihu Lake in April, July, October, December and March 2015 respectively. There were 10 sampling points each time, and the surface samples and columnar samples were collected respectively (the columnar samples were divided into four layers, Each layer is 10cm), and make parallel samples, 100 samples each time, 5 times a total of 500 samples. The monitoring results show that the bottom mud of the Lianhuadang water system belongs to the type of high organic matter (the mass content of organic matter is more than 6%), and the concentrations of As, Cu, Hg, Cd, Cr, Zn, Pb, and Ni in the bottom mud range from 9.14 to 25.05 and 38.24, respectively. ~98.63, 0.14~0.46, 0.15~0.28, 34.94~110.20, 94.58~185.34, 23.62~110.29, 14.26~36.28mg / kg, the concentration of HCH and DDT in the sediment were 0.07~0.09, 0.06~0.10mg / kg, respectively kg, because the "Soil Environmental Quality Standard GB15618-1995" stipulat...

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Abstract

The present invention relates to an engineering method for producing biochar soil from dredging sediment, and belongs to the field of solid waste resource utilization. The biochar soil is prepared by uniformly mixing the raw materials of dredging sediments, poultry manure and dry straw according to a certain weight proportion, adjusting the C/N ratio and moisture content of the mixture, adding a certain proportion of a nitrogen retention and water-retaining agent; carrying out windrow composting by a mechanical turning and static forced ventilation combined manner for about 30 days, maintaining the pile at 55-65 DEG C for 10-12 days until the full maturity of the compost products. The biochar soil is utilized according to actual need. The invention realizes large-scale engineering treatment of dredging sediment, poultry manure and crops straws, provides an ecological way to solve the non-point source pollution caused by dredging sediment and poultry manure, and air problem caused by crops straws burning; and the compost products can be used for ecological engineering construction, so as to organically combine environmental benefits, economic benefits and ecological benefits.

Description

technical field [0001] The invention relates to an engineering method for preparing biological carbon soil from dredging bottom mud, and belongs to the field of resource utilization of solid waste. Background technique [0002] River and lake bottom mud (also known as silt) mainly comes from the sediment carried by surface runoff, terrestrial animal and plant residues, and aquatic animal and plant residues, and pollutants carried by atmospheric dry and wet deposition. It is formed by the precipitation of water bodies under the combined action. Sediment will not only block the river, but also become the "source" of pollutants under certain conditions such as pH, dissolved oxygen, and redox potential. Nutrients, heavy metals, and other substances will be released into the water body, posing a huge threat to water ecological security. . [0003] Ecological dredging is an effective measure to solve the internal pollution of rivers and lakes and dredge waterways. However, if a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05F17/00
CPCC05D9/00C05F17/00C05G3/00C05F7/00C05F11/00Y02W30/40
Inventor 孙德智马智波王剑
Owner BEIJING FORESTRY UNIVERSITY
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