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Biochar restorer for heavy-metal polluted marine deposits and preparation and restoration methods for biochar restorer

A marine sediment and repair method technology, applied in the field of biochar restoration agent and its preparation, can solve the problems of weak heavy metal adsorption capacity, marine heavy metal pollution, low biochar density, etc., and achieve the reduction of heavy metal bioavailability and abundance and the effect of increasing diversity and decreasing content

Inactive Publication Date: 2018-09-28
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the above-mentioned problems such as serious heavy metal pollution in the ocean, difficult to repair, low density of biochar, easy to float, weak adsorption capacity of biochar to heavy metals, and poor restoration effect. The present invention provides a biochar restoration agent

Method used

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  • Biochar restorer for heavy-metal polluted marine deposits and preparation and restoration methods for biochar restorer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A preparation method of a biochar remediation agent for heavy metal-polluted marine deposits, comprising the steps of:

[0034] 1) Raw material treatment: dry the plant raw material at 60°C to constant weight, crush it through a 60-mesh sieve; dry the flocculant waste from sewage treatment, and crush it through a 60-mesh sieve; The above-mentioned plant raw materials were mixed evenly with the flocculant waste at a mass ratio of 1:1, and left to stand for 12 hours; the supernatant was removed, dried at 105°C to constant weight, and pulverized to obtain mixed raw materials;

[0035]2) Preparation of restorative agent: take the mixed raw materials and put them in a container, and carry out pyrolysis in a closed electric furnace, the pyrolysis atmosphere is nitrogen atmosphere, pyrolysis at 500°C, and the heating rate is 5°C·min -1 After the pyrolysis is over, keep the nitrogen atmosphere, cool to 25°C under the protection of nitrogen, and obtain the in-situ biochar remedi...

Embodiment 2

[0039] In this example, the preparation method described in Example 1 is used to prepare the biochar restoration agent, and the obtained biochar restoration agent is applied to the in-situ restoration of heavy metal polluted marine sediments:

[0040] The biochar remediation agent prepared by the above preparation method is applied in situ to heavy metal contaminated deposits, the application method is: directly cover the biochar remediation agent on the sediment polluted by heavy metals; the biochar remediation agent The coverage uses a crawler-type suspension jet machine to cover the biochar-based remediation agent on the surface of the heavy metal-contaminated sediment, and the coverage thickness is 10mm.

Embodiment 3

[0042] In this example, the preparation method described in Example 1 is used to prepare the biochar restoration agent, and the obtained biochar restoration agent is applied to the in-situ restoration of heavy metal polluted marine sediments:

[0043] The biochar remediation agent prepared by the above preparation method is applied in situ to the heavy metal polluted sediment, and the application method is: directly mixed with the heavy metal contaminated sediment; the mixing of the biochar remediation agent uses a ship-borne rotary tiller to The biochar-based remediation agent was mixed with heavy metal-polluted sediments to a mixing depth of 30 cm.

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Abstract

The invention provides a biochar restorer for heavy-metal polluted marine deposits and preparation and restoration methods for the biochar restorer and relates to the field of marine pollution treatment. The preparation method provided by the invention comprises the following steps: 1) treatment of raw materials: drying plant raw materials, and carrying out crushing and sieving; drying sewage treatment flocculant wastes in the air, and carrying out crushing and sieving; and adding water into flocculating wastes to prepare turbid fluid, uniformly mixing the plant raw materials and the flocculant wastes according to a mass ratio of 1: 1, and carrying out baking and crushing, so as to obtain a raw-material mixture; and 2) preparation of restorer: pyrolyzing the raw-material mixture in a hermetic electric furnace in a nitrogen gas atmosphere, and carrying out cooling in the nitrogen gas atmosphere after pyrolyzing ends up, thereby obtaining the biochar restorer. After the restorer providedby the invention is used, the bioavailability level of heavy metals in the marine deposits can be obviously reduced, and the toxic action on marine benthos caused by the heavy metals is alleviated.

Description

technical field [0001] The invention relates to the field of marine pollution control, in particular to a biochar remediation agent for marine sediments polluted by heavy metals, a preparation method and a remediation method thereof. Background technique [0002] Offshore marine sediments suffer from multifaceted heavy metal pollution. Due to industrial and urban wastewater discharge, fertilizer and pesticide application, mining, etc., heavy metals enter the ocean water body through rivers and atmospheric deposition. More than 99% of the heavy metals are accumulated in the sediment. Marine sediments are "sinks" for heavy metal pollution. Heavy metals in sediments are re-released into the aquatic environment through natural recycling, bioturbation and artificial dredging activities. Marine sediments are also the "source" of heavy metal pollution. [0003] my country is rich in metal minerals and has become a major metal producing and consuming country in the world. Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F101/20C02F103/08
CPCC02F11/00C02F2101/20C02F2103/08
Inventor 郑浩刘霞
Owner OCEAN UNIV OF CHINA
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